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  • 201. Carlén, A
    et al.
    Nikdel, K
    Wennerberg, A
    Holmberg, K
    YKI – Ytkemiska institutet.
    Olsson, J
    Surface characteristics and in vitro biofilm formation on glass ionomer and composite resin2001Ingår i: Biomaterials, ISSN 0142-9612, E-ISSN 1878-5905, Vol. 22, s. 481-487Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In the initial stages of dental plaque formation, early colonizing bacteria bind to receptor structures in the pellicle, a proteinaceous film formed instantly after cleaning of the tooth surface. Dental restorative materials with surface characteristics different from the tooth might affect pellicle formation and the ability of bacteria to colonize the oral cavity. in this study (i) roughness and chemical composition of glass ionomer and composite resin surfaces before and after polishing, and (ii) the adsorption of salivary proteins and bacterial adherence to the pellicle-coated surfaces were examined. Compared with unpolished composite resin, unpolished glass ionomer had higher surface roughness, contained more inorganic, positively charged components, collected more proteins, and promoted better bacterial adherence. Polishing had the most pronounced effect on the composite resin, giving an enlarged and a rougher surface with a more inorganic character. Polishing the composite resin also led to increased biofilm formation

  • 202. Carslaw, N
    et al.
    Langer, S
    YKI – Ytkemiska institutet.
    Wolkoff, P
    New Directions: Where is the link between reactive indoor air chemistry and health effects?2009Ingår i: Atmospheric Environment, ISSN 1352-2310, E-ISSN 1873-2844, Vol. 43, nr 24, s. 3808-3809Artikel i tidskrift (Refereegranskat)
  • 203. Chachaty, C
    et al.
    Warr, GG
    Jansson, M
    YKI – Ytkemiska institutet.
    Li, P
    Influence of the polar head size on the dynamics of micellized surfactants1991Ingår i: Journal of Physical Chemistry A, ISSN 1089-5639, E-ISSN 1520-5215, Vol. 95, s. 3830-3836Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The dynamics of micellized quaternary ammonium surfactants has been investigated by means of the frequency dependence of the 13C longitudinal relaxation rates. Trimethyl-, triethyl-, and tributyldodecylammonium bromides were used to systematically vary the bulk of the polar head and examine its influence on the internal and overall motions of the surfactants. The relaxation data were analyzed by means of the two-step model and of a rotational jump model relevant to the trans-gauche isomerizations about the bonds. In the case of the trimethyldodecyl--ammonium bromide an excellent agreement is obtained by the two-step model as the vicinity of the nitrogen is well above the values expected for methylene groups. The jump model shows that this behavior results from a slowing of the internal motions beyond the domain of validity of the two-step model.

  • 204. Chappuis, S
    et al.
    Campiche, A
    Gillieron, D
    Moser, EM
    Lausmaa, J
    YKI – Ytkemiska institutet.
    Reller, A
    Photocatalytically active titania layers: Production at ambient temperature and characterisation of biological properties2009Ingår i: Plasma Processes and Polymers, ISSN 1612-8850, E-ISSN 1612-8869, Vol. 6, nr 6-7, s. 440-445Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The production of phase-pure, photocatalytically active titania layers at ambient temperature is described. This novel synthesis route has been achieved by using direct-current reactive magnetron sputtering as well as plasma-enhanced chemical vapour deposition processes. As a consequence substrates degrading under increased temperature such as, e.g., polymers, biological fibres, tissues, etc., may be coated. The obtained titania coatings are characterised with respect to structure, morphology, phase purity and biological activity. The results of these investigations confirm promising and reproducible photocatalytic, biocompatible as well as bioactive properties. A figure is presented.

  • 205. Cho, DL
    et al.
    Claesson, PM
    YKI – Ytkemiska institutet.
    Gölander, C-G
    Johansson, K
    YKI – Ytkemiska institutet.
    Structure and surface properties of plasma polymerized acrylic acid layers1990Ingår i: Journal of Applied Polymer Science, ISSN 0021-8995, E-ISSN 1097-4628, Vol. 41, s. 1373-1390Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Thin plasma polymerized layers of acrylic acid (PPAA) were deposited onto polyethylene and muscovite mica surfaces. Structure and surface properties of the deposited layer depend on the polymerization conditions. The content of carboxylic groups in the layer decreases, whereas the degree of crosslinking or branching increases, with increasing discharge power. A soft, sticky layer with a low contact angle against water is obtained when a low discharge power (5 W) is used. In contrast, a hard film with a rather high water contact angle is obtained when the discharge power is high (50 W). A surface force apparatus was employed to study some film properties including adhesion force, crack formation, and capillary condensation. The adhesion force between plasma polymerized acrylic acid layers prepared at a low discharge power is high in dry air. It decreases remarkably in humid air and no adhesion is observed in water. In dry air, the adhesion force between PPAA layers decreases as the discharge power increases.

  • 206.
    Cho, DL
    et al.
    YKI – Ytkemiska institutet.
    Ekengren, Ö
    Composite membranes formed by plasma-polymerized acrylic acid for ultrafiltration of bleach effluent1993Ingår i: Journal of Applied Polymer Science, ISSN 0021-8995, E-ISSN 1097-4628, Vol. 47, s. 2125-2133Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Composite membranes were formed by deposition of plasma-polymerized acrylic acid (PPAA) films onto porous commercial membranes to improve the rejection, especially of chlorinated compunds, in ultrafiltration of E-stage bleach effluent. Although increased rejections were accompanied by reduced flux, in most cases, the reductionswere not significiant considering the extent of increased rejections. A good composite membrane showed the AOX removal of 94% (76% before the modification) and the chemical oxygen demand (COD) removal of 84% (67% before the modification) with 33% reduction of the flux. The permeate was optically clean. The improved rejection is attributed to the tightly crosslinked network of a plasma polymer film and its negatively charged surface. Ultrathin film thickness and the hydrophilic property of a plasma polymer film minimize the reduction of flux.

  • 207. Cho, DL
    et al.
    Sjöblom, E
    YKI – Ytkemiska institutet.
    Plasma treatment of wood1990Ingår i: Journal of Applied Polymer Science, ISSN 0021-8995, E-ISSN 1097-4628, Vol. 46, s. 461-472Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Wood was treated with hydrophobic plasma polymers to reduce the water penetration. Due to the released water vapour and/or molecular weight components from wood under low pressures the efficiency of the plasma treatment was dependent on the evacuation time before plasma treatment. A long evacuation for the efficient treatment could be avoided by increasing the monomer pressure. Adhesion of a paint onto the hydrophobized wood was poor. The adhesion was improved by hydrophilic post-treatment at a sacrifice of the reduction of water penetration. However, a large reduction of water penetration and a good adhesion to a

  • 208. Christenson, HK
    et al.
    Claesson, PM
    YKI – Ytkemiska institutet.
    Direct measurements of the force between hydrophobic surfaces in water2001Ingår i: Advances in Colloid and Interface Science, ISSN 0001-8686, E-ISSN 1873-3727, Vol. 91, s. 391-436Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Direct measurements of the force between hydrophobic surfaces across aqueous solutions are reviewed. The results are presented according to the method of preparation of the hydrophobic surfaces. No single model appears to fit all published results, and an attempt is made to classify the measured interactions in three different categories. The large variation of the measured interaction, often within each class, depending on the type of hydrophobic surface is emphasized. (I) Stable hydrophobic surfaces show only a comparatively short-range interaction, although little quantitative data on this attraction have been published. (II) Many results showing very long-range attractive forces are most likely due to the presence of sub-microscopic bubbles on the hydrophobic surfaces. Such an interaction is typically measured between silica surfaces made hydrophobic by silylation. Between self-assembled thiol layers on gold surfaces very short-range attractive forces are possibly due to the presence or nucleation of bubbles. The reason for the apparent stability of these bubbles is not clear and warrants further investigation. (III) Results obtained with LB films of surfactants or lipids on mica appear to give rise to a different type of force that fits neither of these two categories. This force is an exponentially decaying attraction, often of considerable range. The force turns more attractive at smaller separations, and may at short range be similar to the interaction measured between stable hydrophobic surfaces. An apparently similar, exponential attraction is also found between mica surfaces bearing surfactants adsorbed from cyclohexane, between silylated, plasma-treated mica surfaces and between both mica and silica surfaces with surfactants adsorbed in situ. This type of force also occurs between some surfaces of relatively low hydrophobicity as well as between one such hydrophobic surface and a hydrophilic surface. No convincing model can explain this third type of interaction for all systems in which it has been observed. This review of work to date points to the importance of the morphology and structure of the hydrophobic surface, and how it may change during the interaction of two surfaces

  • 209. Christenson, HK
    et al.
    Claesson, PM
    YKI – Ytkemiska institutet.
    Berg, J
    Herder, PC
    Forces between fluorocarbon surfactant monolayers: salt effects on the hydrophobic interaction1989Ingår i: Journal of Physical Chemistry A, ISSN 1089-5639, E-ISSN 1520-5215, Vol. 93, s. 1472-1478Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Further studies of the hydrophobic attraction between fluorocarbon surfaces in water have been carried out, including (i) a comparison between surfaces prepared by Langmuir-Blodgett deposition and by adsorption from solution using the same surfactant and (ii) the effect of added electrolyte. In general, the surfaces prepared by deposition show the longest range of the attraction - measurable at 80-90 nm with an exponential decay length of about 15 nm at separations above 5 nm. In the case of adsorbed monolayers incomplete adsorption or additional adsorption to the hydrophobic monolayer surfaces often leads to an effective attraction that is of considerably shorter range. Under optimal conditions, however, adsorbed monolayers give an attraction of a similar range. In both cases the interaction becomes more attractive at small separations and appears to decay exponentially with a decay length of 2-3 nm below about 15 nm. The deposited fluorocarbon monolayers are unstable in sodium or potassium salt solution but remain intact in terapentylammonium bromide. With increasing concentration of this salt the range of the hydrophobic interaction decreases as more and more ions adsorb to the surfaces. The short-range interaction seems to be less sensitive to the presence of electrolyte - the adhesion at contact shows a much less dramatic decrease with increasing electrolyte concentration. Nevertheless, the measured electrolyte dependence of the hydrphobic interaction is at least partly due to the surfaces becoming less hydrophobic themselves, as reflected by their caviation bahaviour.

  • 210.
    Claesson, P
    YKI – Ytkemiska institutet.
    Poly(ethylene oxide) surface coatings: Relations between intermolecular forces, layer structure and protein repellency1993Ingår i: Colloids and Surfaces A: Physicochemical and Engineering Aspects, ISSN 0927-7757, E-ISSN 1873-4359, Vol. 77, s. 109-118Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The adsorption of some ethylene oxide-containing surfactants and polymers has been studied using the surface force technique. The forces acting between surfaces coated with such surfactants and polymers have been investigated as a function of temperature. For all ethylene oxide-containing molecules studied, the general trends of the temperature dependence of the surface forces and the structure of the adsorbed layer can be rationalised by considering the temperature dependence of the interaction between the ethylene oxide group and water. The different polymers and surfactants differ however in terms of surface affinity and in terms of the range of the surface forces. Knowledge of the surface forces acting between poly(ethylene oxide) layers can be used to establish why such coatings show a low protein adsorption, particularly at low temperatures.

  • 211.
    Claesson, P
    et al.
    YKI – Ytkemiska institutet.
    Blom, C
    Herder, P
    Ninham, BW
    Interactions between water-stable hydrophobic Langmuir-Blodgett monolayers on mica1986Ingår i: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 114, s. 234-242Artikel i tidskrift (Refereegranskat)
  • 212.
    Claesson, P
    et al.
    YKI – Ytkemiska institutet.
    Boschkova, K
    Interactions between interfaces coated with block copolymers1997Ingår i: J Surf Sci Soc Japan, Vol. 18, s. 610-617Artikel i tidskrift (Refereegranskat)
  • 213.
    Claesson, P
    et al.
    YKI – Ytkemiska institutet.
    Carmona-Ribeiro, AM
    Kurihara, K
    Dihexadecyl phosphate monolayers: Intralayer and Interlayer Interactions1989Ingår i: Journal of Physical Chemistry A, ISSN 1089-5639, E-ISSN 1520-5215, Vol. 93, s. 917-922Artikel i tidskrift (Refereegranskat)
  • 214.
    Claesson, P
    et al.
    YKI – Ytkemiska institutet.
    Christenson, H
    Very long range attractive forces between uncharged hydrocarbon and fluorocarbon surfaces in water1988Ingår i: Journal of Physical Chemistry A, ISSN 1089-5639, E-ISSN 1520-5215, Vol. 92, s. 1650-1655Artikel i tidskrift (Refereegranskat)
  • 215.
    Claesson, P
    et al.
    YKI – Ytkemiska institutet.
    Gölander, C-G
    Bergenståhl, B
    YKI – Ytkemiska institutet.
    Kan ytkemisterna uppfylla kirurgens hetaste drömmar?1989Ingår i: Kemisk Tidskrift, ISSN 1650-0725, Vol. 5, s. 43-46Artikel i tidskrift (Refereegranskat)
  • 216.
    Claesson, P
    et al.
    YKI – Ytkemiska institutet.
    Herder, P
    Blom, C
    Ninham, BW
    Interactions between a positively charged hydrophobic surface and a negatively charged bare mica surface1987Ingår i: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 118, s. 68-79Artikel i tidskrift (Refereegranskat)
  • 217.
    Claesson, P
    et al.
    YKI – Ytkemiska institutet.
    Herder, P
    Stenius, P
    YKI – Ytkemiska institutet.
    Eriksson, JC
    Pashley, RM
    An ESCA and AES study of ion-exchange on the basal plane of mica1986Ingår i: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 109, s. 31-39Artikel i tidskrift (Refereegranskat)
  • 218.
    Claesson, P
    et al.
    YKI – Ytkemiska institutet.
    Horn, RG
    Pashley, RM
    Measurement of surface forces between mica sheets immersed in aqueous quaternary ammonium ion solutions1984Ingår i: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 100, s. 250-263Artikel i tidskrift (Refereegranskat)
  • 219.
    Claesson, P
    et al.
    YKI – Ytkemiska institutet.
    Kjellander, R
    Stenius, P
    YKI – Ytkemiska institutet.
    Christenson, H
    Direct measurement of temperature-dependent interactions between non-ionic surfactant layers1986Ingår i: Journal of the Chemical Society, Faraday Transactions, ISSN 0956-5000, E-ISSN 1364-5455, Vol. 82, s. 2735-2746Artikel i tidskrift (Refereegranskat)
  • 220.
    Claesson, Per M
    YKI – Ytkemiska institutet.
    Forces between lipid-coated interfaces1997Ingår i: Food Colloids: Proteins, Lipids and Polysaccharides / [ed] Dickinson, E. & Bergenståhl, B., Royal Society of Chemistry, 1997, s. 201-216Kapitel i bok, del av antologi (Refereegranskat)
    Abstract [en]

    In this review article we discuss the forces acting between hydrophobic surfaces and between air-water interfaces coated with lipids. The main focus is on the short-range interactions between monoglyceride coated surfaces. The forces generated by this class of compounds are compared with those obtained in the presence of phospholipids and surfactants with sugar headgroups. The experimental results show that the forces generated when the lipid chains are in a fluid state generally are stronger compared to when the hydrocarbon chains are in a frozen state. This is the case despite that the area per molecule is larger in the former case. This result can most easily be rationalized provided the molecular origin of the short range repulsion is of steric rather than a hydration force, as recently suggested by Israelachvili and Wennerström (J. Phys. Chem. 96, 520-531 (1992)). In this review article we also present three techniques that can be utilized for studying interactions between lipid layers. The osmotic stress technique that provides information about forces in liquid crystalline phases, the interferometric surface force technique that is employed for studying forces between solid surfaces, and the thin film balance utilized in order to study the interactions between two air-liquid interfaces.

  • 221.
    Claesson, Per M
    YKI – Ytkemiska institutet.
    Interactions between surfaces coated with carbohydrates, glycolipids, and glycoproteins1998Ingår i: Biopolymers at Interfaces / [ed] Malmsten, M, Marcel Dekker, 1998, s. 281-320Kapitel i bok, del av antologi (Refereegranskat)
  • 222.
    Claesson, Per M
    YKI – Ytkemiska institutet.
    New techniques for optimization of particulate cleaning2007Ingår i: Handbook for Cleaning/Decontamination of Surfaces, Elsevier, 2007, s. 885-927Kapitel i bok, del av antologi (Refereegranskat)
  • 223.
    Claesson, Per M
    YKI – Ytkemiska institutet.
    Surface forces apparatus: Studies of polymers, polyelectrolytes, and polyelectrolyte-surfactant mixtures at interfaces1999Ingår i: Colloid-Polymer Interactions: From Fundamentals to Practice / [ed] Farinato, RS & Dubin, PL, John Wiley & Sons, 1999, s. 287-329Kapitel i bok, del av antologi (Refereegranskat)
  • 224.
    Claesson, Per M
    YKI – Ytkemiska institutet.
    The surface force technique: Interactions between surfactant bilayers and between protein layers1994Ingår i: Studying Cell Adhesion / [ed] Bongrand, P., Claesson, P.M., & Curtis, A.S.G., Springer Berlin/Heidelberg, 1994, s. 15-35Kapitel i bok, del av antologi (Refereegranskat)
    Abstract [en]

    Introduction: The forces operating between colloidal particles are of utmost importance for the stability of dispersions and emulsions. Such forces also determine the adhesion between macroscopic surfaces, the adsorption of colloids onto surfaces and they are important in the initial stage of the cell adhesion process. In applied surface chemistry much effort is going into modifying the forces acting between particles in order to give the often complex technical colloidal systems the preferred properties. This has inspired a great deal of fundamental research concerned with determining which types of forces that are operating and how the strength and magnitude of these forces can be varied by addition of additives to the solution or by surface modification techniques. This review will start with a brief recapitulation about the types of forces that are important in colloidal systems and some basic properties of these forces. Next, one important method for studying these forces, the surface force technique, will be described. Finally, the type of information that can be obtained with this technique will be discussed using examples from our studies of surfactant bilayers and of adsorbed protein layers.

  • 225. Claesson, Per M
    et al.
    Blomberg, Eva
    YKI – Ytkemiska institutet.
    Surface Forces and Emulsion Stability2001Ingår i: Encyclopedic Handbook of Emulsion Technology / [ed] Johan Sjöblom, Marcel Dekker, 2001, s. 305-326Kapitel i bok, del av antologi (Refereegranskat)
  • 226.
    Claesson, Per M.
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, YKI – Ytkemiska institutet.
    Dedinaite, Andra
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, YKI – Ytkemiska institutet.
    Association between Polyelectrolytes and Oppositely Charged Surfactants in Bulk and at Solid/Liquid Interfaces: Chapter 112011Ingår i: Colloid Stability and Application in Pharmacy / [ed] Tharwat F. Tadros, Wiley-VCH Verlag GmbH & Co. KGaA , 2011, s. 337-395Kapitel i bok, del av antologi (Refereegranskat)
    Abstract [en]

    Mixtures of polyelectrolytes and oppositely charged surfactants find applications in many processes and products that are used in our daily life. Such systems also show many interesting features from a scientific point of view. Due to the combined technological relevance and scientific challenge, considerable research efforts have been made in this area in recent years. This has resulted in new theoretical approaches, the development of simulation methods and new experimental techniques and, of course, a large body of new findings. Together, these efforts have increased the understanding significantly, especially during the last 5 years. This chapter reviews some aspects of this topic, focusing on bulk association and association at solid/liquid interfaces. The review is focused on developments during the 21st century, even though in some cases a historical perspective is also offered.

  • 227.
    Claesson, Per M
    et al.
    YKI – Ytkemiska institutet.
    Dedinaite, Andra
    YKI – Ytkemiska institutet.
    Polyelectrolyte-surfactant interactions at solid-liquid interfaces studied with surface force techniques2001Ingår i: Physical Chemistry of Polyelectrolytes / [ed] Tsetska Radeva, Marcel Dekker, 2001, s. 447-507Kapitel i bok, del av antologi (Refereegranskat)
  • 228.
    Claesson, Per M
    et al.
    YKI – Ytkemiska institutet.
    Dédinaité, Andra
    YKI – Ytkemiska institutet.
    Association between polyelectrolytes and oppositely charged surfactants in bulk and at solid/liquid interfaces2007Ingår i: Colloid Stability and Application in Pharmacy / [ed] Tharwat F. Tadros, John Wiley & Sons, 2007, s. 337-395Kapitel i bok, del av antologi (Refereegranskat)
  • 229.
    Claesson, Per M
    et al.
    YKI – Ytkemiska institutet.
    Ederth, T
    Surface force measurements1995Ingår i: Trends in Physical Chemistry: Research Trends, Trivandrum, India, Trivandrum, India: Science Information , 1995, s. 161-194Kapitel i bok, del av antologi (Refereegranskat)
    Abstract [en]

    The forces acting between colloidal particles and between surfaces are of utmost importance for determining the behaviour in dispersed systems and adhesion phenomena. Several techniques are now available for directly measuring these surface forces and in this review we focus on five different methods. These include three techniques for measuring forces between solid surfaces; the interferometric surface force apparatus, known as the SFA, the atomic force microscope (AFM) with a colloidal probe, and a novel instrument which does not utilise optical techniques. We also describe two different methods that can be used for measuring forces between "soft" interfaces, the thin-film-balance for foam, emulsion and solid/fluid/fluid films, and the osmotic stress method, commonly used for biological and emulsion systems. The advantages and limitations of each technique are discussed and typical results are presented.

  • 230.
    Claesson, Per M
    et al.
    YKI – Ytkemiska institutet.
    Kjellin, URM
    Sugar surfactants2002Ingår i: Encyclopedia of Surface and Colloid Science / [ed] Hubbard A and Somasundaran P, Marcel Dekker, 2002, s. 4909-4925Kapitel i bok, del av antologi (Refereegranskat)
  • 231.
    Claesson, Per M
    et al.
    YKI – Ytkemiska institutet.
    Malmsten, Martin
    YKI – Ytkemiska institutet.
    Surfaces coated with ethyl(hydroxyethyl) cellulose: Temperature effects on adsorption and interaction1995Ingår i: Cellulose and Cellulose Derivatives: Physico-chemical aspects and industrial applications / [ed] Kennedy, J.F., Phillips, G.O., Williams, P.A., & Piculell, L., Woodhead Publishing Limited, 1995, s. 425-433Kapitel i bok, del av antologi (Refereegranskat)
    Abstract [en]

    The temperature dependence of the forces acting between hydrophobic surfaces coated by a layer of ethyl(hydroxyethyl) cellulose, (EHEC), has been studied as a function of separation and temperature. Both the situation where the adsorbed amount is kept constant and where the adsorbed amount is allowed to vary with temperature have been explored. In both cases the surface interaction is very temperature sensitive due to the temperature dependent interactions between ethylene oxide groups and water. The results are discussed in terms protein repellency of EHEC coated surfaces and in terms of EHEC as a steric stabilizer.

  • 232.
    Claesson, Per M
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, YKI – Ytkemiska institutet.
    Rutland, Mark W.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, YKI – Ytkemiska institutet.
    Measuring interactions between surfaces2002Ingår i: Handbook of Applied Colloid and Surface Chemistry, Chichester, Weinheim: Wiley , 2002, s. 383-414Kapitel i bok, del av antologi (Refereegranskat)
  • 233.
    Claesson, Per M
    et al.
    YKI – Ytkemiska institutet.
    Stubenrauch, Cosima
    Thin film and foam properties of sugar-based surfactants: Chapter 42009Ingår i: Sugar-based surfactants: Fundamentals and applications, CRC Press, 2009, s. 105-151Kapitel i bok, del av antologi (Refereegranskat)
  • 234.
    Claesson, PM
    YKI – Ytkemiska institutet.
    Experimental evidence for repulsive and attractive forces not accounted forby conventional dlvo theory1987Ingår i: Progress in Colloid and Polymer Science, ISSN 0340-255X, E-ISSN 1437-8027, Vol. 74, s. 48-54Artikel i tidskrift (Refereegranskat)
  • 235.
    Claesson, PM
    YKI – Ytkemiska institutet.
    Measurements of surface interactions1997Ingår i: Colloids and Surfaces A: Physicochemical and Engineering Aspects, ISSN 0927-7757, E-ISSN 1873-4359, Vol. 123, s. 339-340Artikel i tidskrift (Refereegranskat)
  • 236.
    Claesson, PM
    et al.
    YKI – Ytkemiska institutet.
    Arnebrant, T
    Bergenståhl, B
    YKI – Ytkemiska institutet.
    Nylander, T
    Direct measurements of the interaction between layers of insulin adsorbed on hydrophobic surfaces1989Ingår i: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 130, s. 457-466Artikel i tidskrift (Refereegranskat)
  • 237.
    Claesson, PM
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, YKI – Ytkemiska institutet.
    Bergström, M
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, YKI – Ytkemiska institutet.
    Dedinaite, A
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, YKI – Ytkemiska institutet.
    Kjellin, Mikael
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, YKI – Ytkemiska institutet.
    Legrand, J-F
    Grillo, I
    Mixtures of cationic polyelectrolyte and anionic surfactant studied with small-angle neutron scattering2000Ingår i: Journal of Physical Chemistry B, ISSN 1520-6106, E-ISSN 1520-5207, Vol. 104, s. 11689-11694Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Small-angle neutron scattering (SANS) data for solutions containing a highly charged cationic polyelectrolyte and an anionic surfactant are presented. The scattering data were obtained in pure D2O, emphasizing the scattering from the polyelectrolyte, and in a H2O/D2O mixture that contrast matches the polyelectrolyte. In the absence of surfactant, a broad scattering peak due to the mesh size of the polyelectrolyte solution is the most characteristic feature. This peak moves to larger q-values (smaller distances) as the polyelectrolyte concentration is increased, as expected for a semidilute polyelectrolyte solution. Addition of a small amount of surfactant reduces and finally removes this peak. Instead a sharp diffraction peak appears at high q-values. This Bragg peak corresponds to a characteristic distance of 37-39 Å, and it is observed when either the polyelectrolyte or the surfactant is contrast matched by the solvent. Once this peak has appeared, its position does not change when the surfactant concentration is increased. The intensity of the peak grows, however, until a stoichiometric polyelectrolyte-surfactant complex has been formed. The Bragg peak remains in excess surfactant solution. These results are discussed in relation to the structure of the polyelectrolyte-surfactant aggregates and in connection with recent results from surface force and turbidity measurements using the same polyelectrolyte-surfactant pair.

  • 238.
    Claesson, PM
    et al.
    YKI – Ytkemiska institutet.
    Blomberg, E
    YKI – Ytkemiska institutet.
    Fröberg, JC
    Nylander, T
    Arnebrant, T
    Protein interactions at solid surfaces1995Ingår i: Advances in Colloid and Interface Science, ISSN 0001-8686, E-ISSN 1873-3727, Vol. 57, s. 161-227Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In this review article we discuss a large number of the studies of interactions between protein-coated surfaces that has been presented in the literature. We also demonstrate how to relate surface force data to results from other techniques in order to provide a more full picture of protein behaviour at interfaces. One aim of the article is to discuss the experimental procedure and the difficulties with surface force measurements in protein systems. It is particularly important to point out how the sensitivity of this technique differs from that of other techniques, e.g. in determining structural changes in adsorbed proteins and in detecting proteins adsorbed on top of an inner firmly bound layer. It is also important to realize which surface force data that cannot be easily compared with findings from other techniques (one example is the kinetics of adsorption and desorption). We have tried to group proteins into different classes depending on their size and structure, and to try to find results that are common within these classes. It was found that some observations for unordered proteins with amphiphilic character, and for the small compact proteins, appear consistently within the respective class. Hence, for these types of protein common features/principles of the interfacial behaviour are identified. The very large and flexible glycoproteins behave in a similar way to synthetic polymers, but we found it hard to draw any firm conclusions based on the surface force studies presented so far. Perhaps, the most complicated surface behaviour is observed for soft globular proteins that undergo large scale conformational changes upon adsorption and when the layers are held under a high compressive force.

  • 239.
    Claesson, PM
    et al.
    YKI – Ytkemiska institutet.
    Blomberg, E
    YKI – Ytkemiska institutet.
    Kumachova, EE
    Amelina, EA
    Schukin, ED
    Interactions between fluorocarbon surfaces in aqueous nonionic block copolymer solutions1991Ingår i: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 147, nr 1, s. 129-136Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The interaction between solid fluorocarbon surfaces immersed in aqueous solutions of a poly(ethylene oxide) - poly(propylene oxide) - poly(ethylene oxide) block copolymer (Proxanol 268) has been determined after different adsorption times. It was found that the compressed layer thickness is independent of the adsorption time, whereas the range of the repulsive force decreases during the first hours. This is interpreted as evidence for a decreasing fraction of polymer tails in the adsorbed polymer layer. A weak attractive force is observed when Proxanol coated surfaces are separated from contact. The presence of this attraction on separation only indicates structural changes in the block copolymer layer when two such layers on opposing surfaces are in contact for a prolonged time. Most of the Proxanol layer is easily desorbed by dilution with water. These results are discussed in connection with the known properties of perfluorocarbon emulsions coated with the same block copolymer.

  • 240.
    Claesson, PM
    et al.
    YKI – Ytkemiska institutet.
    Blomberg, E
    YKI – Ytkemiska institutet.
    Paulson, O
    Malmsten, M
    Adsorption and interaction of a graft copolymer of poly(ethylene imine) and poly(ethylene oxide)1996Ingår i: Colloids and Surfaces A: Physicochemical and Engineering Aspects, ISSN 0927-7757, E-ISSN 1873-4359, Vol. 112, s. 131-139Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The adsorption of proteins and particles onto surfaces carrying firmly adsorbed or covalently bound chains of poly(ethylene oxide) (PEO) is generally very low. This makes it of fundamental and practical interest to learn about the structure of PEO-coatings and how PEO-coated surfaces interact with each other and e.g. proteins. A prerequisite for such studies is, of course, that stable PEO-coated surfaces can be obtained. For this purpose we employed a two-step method to coat negatively charged surfaces, such as mica or silica, with PEO. In the first reaction step, cationic poly(ethylene irnine) is adsorbed onto the negatively charged surface. In the next step, the adsorbed polyelectrolyte is reacted with a functionalized poly(ethylene oxide) chain. Both reaction steps were followed both by ellipsometry and by direct measurement of surface forces. From these measurements we obtained inforrnation of the adsorbed amount, the layer thickness, as well as the range and distance dependence of the interaction between two PEO-coated surfaces.

  • 241.
    Claesson, PM
    et al.
    YKI – Ytkemiska institutet.
    Cho, DL
    Gölander, CG
    Kiss, E
    Parker, JL
    Functionalized mica surfaces obtained by a cold plasma process1990Ingår i: Progress in Colloid and Polymer Science, ISSN 0340-255X, E-ISSN 1437-8027, Vol. 82, s. 330-336Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A surface modification procedure based on the cold plasma technique has been utilized in order to introduce new functional groups onto muscovite mica surfaces. In the first reaction step mica surfaces are exposed to a water vapor plasma. The interaction between mica surfaces and reactive species in the plasma results in information of surface hydroxyl groups. These groups are reactive toward chlorosilanes in the gas phase, which provides a versatile way to obtain mica surfaces with a variety of different surface chemical groups. For instance, poly(ethylene oxide) chains have been covalently attached to mica surfaces.-In a different surface modification route, mica surfaces have been coated with thin plasma polymer layers. Mechanical and surface properties of plasma polymer films depend, of course, on the type of monomer, but also on the condition used during polymerization (e.g., flow rate, pressure and discharge power). The surface force technique has, together with spectroscopic analyses, provided information about how the adhesion force and mechanical strength of different plasma polymers of acrylic acid depend on the polymer structure.

  • 242.
    Claesson, PM
    et al.
    YKI – Ytkemiska institutet.
    Christenson, HK
    Berg, JM
    Neuman, RD
    Interactions between mica surfaces in the presence of carbohydrates1995Ingår i: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 172, s. 415-424Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The forces acting between muscovite mica surfaces across solutions containing either uncharged carbohydrates (cyclodextrin and sucrose) or a weakly charged hemicellulose (xylan) were measured using a surface force apparatus. Both the uncharged carbohydrates and xylan adsorb onto the mica basal plane. The adsorption of the uncharged carbohydrates results in a decrease in the longrange electrostatic double-layer force, thereby indicating a reduction in surface charge density. At a low ionic strength (1 x 10-3 M KBr) the adsorption of xylan is very limited, and the resulting adsorbed layer has a thickness similiar to that observed for cyclodextrin and sucrose. When the ionic strength of the solution is increased, a slow buildup of the adsorbed xylan layer takes place. The functional form of the interactions between these thicker layers is consistent with the forces expected for anchored polymer brushes in an good solvent.

  • 243.
    Claesson, PM
    et al.
    YKI – Ytkemiska institutet.
    Dahlgren, MAG
    YKI – Ytkemiska institutet.
    Eriksson, L
    Forces between polyelectrolyte-coated surfaces: relations between surface interaction and floc properties1994Ingår i: Colloids and Surfaces A: Physicochemical and Engineering Aspects, ISSN 0927-7757, E-ISSN 1873-4359, Vol. 93, s. 293-303Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The forces acting between negatively charged mica surfaces in the presence of some different cationic polyelectrolytes have been measured using a surface force apparatus. The different polyelectrolytes used have between 10% and 100% of the monomers charged. Particular emphasis has been given to the forces acting between the polyelectrolyte-coated surfaces when the ionic strength of the solution is low, i.e. when electrostatic forces predominate the interaction between the surface and the polyelectrolyte. Under these conditions the most highly charged polyelectrolytes adsorb in a very flat conformation and only a weak recharging is observed even at polyelectrolyte concentrations considerably above that needed to neutralise the mica surface charge. The surface force data are discussed in relation to the floc structures and properties obtained when latex particles are flocculated by polyelectrolytes. These studies are carried out by using a device that is based on three photometric dispersion analysers. The floc structures formed in the presence of various polyelectrolytes can to a large extent be rationalised by considering the interactions measured in the surface force apparatus provided that the difference in charge density of the mica surface and the latex surface is kept in mind.

  • 244.
    Claesson, PM
    et al.
    YKI – Ytkemiska institutet.
    Dedinaite, A
    YKI – Ytkemiska institutet.
    Bergenståhl, B
    YKI – Ytkemiska institutet.
    Campbell, B
    Christenson, H
    Interactions between hydrophilic mica surfaces in triolein: Triolein surface orientation, solvation forces, and capillary condensation1997Ingår i: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 13, s. 1682-1688Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Results obtained from surface force measurements using hydrophilic mica surfaces in triolein are presented. The forces were determined for different water activities in the triglyceride sample. With anhydrous triolein two oscillations in the force curve are observed. They appear at a separation of 60-50 Å and 30-20 Å. An interfacial ordering of triolein, allowing two molecular layers between the surfaces at the position of the outer oscillation and one molecular layer at the inner one is proposed. This structure at the interface is different from the triglyceride conformation suggested for the bulk system. A dramatic effect of water content on the structural forces is observed. The number and amplitude of the oscillations are dependent on the water content. The oscillations completely disappear when the triolein sample is satured with water, and the force becomes purely attractive. These data are interpreted in terms of preferential adsorption of water molecules onto the hydrophilic mica surface and in terms of a changing water adsorption with surface separation. The adhesion force between the surfaces is strongly increased when the water content is close to its saturation value. The strong adhesion is attributes to the presence of a water capillary around the contact position.

  • 245.
    Claesson, PM
    et al.
    YKI – Ytkemiska institutet.
    Dedinaite, A
    YKI – Ytkemiska institutet.
    Blomberg, E
    YKI – Ytkemiska institutet.
    Sergeyev, VG
    Polyelectrolyte-surfactant association at solid surfaces1996Ingår i: Berichte Der Bunsen-Gesellschaft: Physical Chemistry, Chemical Physics, ISSN 0005-9021, Vol. 100, s. 1008-1013Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The interferometric surface force technique has been utilized for studying the inreraction between negatively charged surfaces coated with a cationic polyelectrolyte across solutions of anionic surfactant, sodium dodecyl sulphate (SDS). The polyelectrolyte used was poly ([2-(propionyloxy)ethyl]trimethylammonium chloride), PCMA, which has one positive charge per segment. At low ionic strength the polyelectrolyte adsorbs in a flat conformation and neutralizes the negative mica surface charge. The interaction forces between the polyelectrolytecoared surfaces are dominated by a strongly attractive force at distances shorter than about 150 Å. Addition of SDS into the measuring chamber to a concentration of about 0.1 cmc changes the interaction forces dramatically. The long-range forces are now repulsive due to a recharging of the surfaces. The polyelectrolyte layer also sweüs considerably and, more surprisingly, the force versus distance profile displays clear oscillations. We interpret these oscillations as being caused by the spatial arrangement of SDS micelles stabilized by the polyelectrolyte. The oscillations in the force curve remain as the SDS concentration is increased to cmc. The interaction forces and the layer structure for the PCMA/SDS system are very different compared to those observed for weakly charged polyelectrolyte/SDS and Iysozyme/SDS systems. The differences can be rationalized by considering that los charge density polyelectrolytes and Iysozyme, a compact cationic globular protein, cannot equally efficiently stabilize SDS micelles as a flexible high charge density cationic polyelectrolyte such as PCMA .

  • 246.
    Claesson, PM
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, YKI – Ytkemiska institutet.
    Dedinaite, A
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, YKI – Ytkemiska institutet.
    Fielden, M
    Kjellin, Mikael
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, YKI – Ytkemiska institutet.
    Audebert, R
    Polyelectrolyte-surfactant interactions at interfaces1997Ingår i: Progress in Colloid and Polymer Science, ISSN 0340-255X, E-ISSN 1437-8027, Vol. 106, s. 24-33Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Interactions between negatively charged surfaces coated with cationic polyelectrolytes across solutions containing an anionic surfactant, sodium dodecyl sulphate (SDS) have been studied. Polyelectrolytes with charge densities between 100% and 10%, counted per monomer unit, were used. At low ionic strength the polyelectrolytes adsorb in a flat conformation to neutralize the negative mica surface charge. The higher the linear charge density of the polyelectrolyte, the thinner adsorbed layers are obtained. In no case could any desorption be detected when the polyelectrolyte containing solution was replaced with an aqueous polyelectrolyte-free solution. The presence of SDS at concentrations considerably below the critical micellar concentration, cmc, does in all cases result in a recharging and a considerable swelling of the adsorbed layer. This is due to a cooperative association of surfactants in the preadsorbed polyelectrolyte layer. In case of the 100% charged PCMA, the force versus distance profile displays clear oscillations. We interpret these oscillations as being caused by the spatial arrangement of SDS micelles stabilised by the polyelectrolyte. The oscillations in the force curve remain as the SDS concentration is increased to twice the cmc. No similar oscillations in the force distance curve are observed when the surfaces are precoated with less charged polyelectrolytes. In these cases a strong swelling of the polyelectrolyte layer is observed once the surfactant concentration reaches a critical value (well below the cmc).

  • 247.
    Claesson, PM
    et al.
    YKI – Ytkemiska institutet.
    Dedinaite, A
    YKI – Ytkemiska institutet.
    Rojas, OJ
    Polyelectrolytes as adhesion modifiers2003Ingår i: Advances in Colloid and Interface Science, ISSN 0001-8686, E-ISSN 1873-3727, Vol. 104, s. 53-74Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Adsorbed layers of polyelectrolytes have been studied with atomic force microscopy (AFM) and the interferometric surface force apparatus (SFA). Particular emphasis was put on determining the effect of the polyelectrolyte charge density on surface topography, and the effect of the polyelectrolyte coating on the adhesive properties. The AFM was employed to image individual polymer chains at low adsorption densities and to characterize the layer topography and coverage at higher adsorption densities. The adhesive properties between two polyelectrolyte-coated surfaces in air were determined as a function of the number of contacts made at any given spot. The data provide evidence for formation of electrostatic bridges, particularly when highly charged polyelectrolytes are used. Further, material transport between the surfaces is observed when the polyelectrolyte is either highly charged or have a very low charge density. For intermediate charge densities we could not observe any indication of material transfer. The adhesion between one polyelectrolyte-coated surface and one bare surface was initially higher than that between two polyelectrolyte-coated surfaces. However, due to material transfer between the two surfaces the adhesion decreased significantly with the number of times that the surfaces were driven into contact. For the polyelectrolytes of the lowest charge density the results suggest that entanglement effects contribute to the adhesive interaction. The modification of the adhesion by polyelectrolytes in practical systems such as in the case of dry-strength additives to improve paper resistance is also considered

  • 248.
    Claesson, PM
    et al.
    YKI – Ytkemiska institutet.
    Ederth, T
    Bergeron, V
    Rutland, MW
    YKI – Ytkemiska institutet.
    Techniques for measuring surface forces1996Ingår i: Advances in Colloid and Interface Science, ISSN 0001-8686, E-ISSN 1873-3727, Vol. 67, s. 119-183Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The forces acting between colloidal particles and between surfaces are of utmost importance for determining the behaviour of dispersed systems and adhesion phenomena. Several techniques are now available for direct measurement of these surface forces. In this review we focus on some of these methods. Two techniques for measuring forces between macroscopic solid surfaces; the interferometric surface force apparatus, known as the SFA, and a novel instrument which is based on a bimorph force sensor, the so called MASIF, are described in some detail. Forces between a macroscopic surface and a particle can be measured with the atomic force microscope (AFM) using a colloidal probe, or by employing total internal reflection microscopy (TIRM) to monitor the position of a colloidal particle trapped by a laser beam. We also describe two different techniques that can be used for measuring forces between "soft" interfaces, the thin film balance (TFB) for single foam, emulsion and solid/fluid/fluid films, and osmotic stress methods, commonly used for studying interactions in liquid crystalline surfactant phases or in concentrated dispersions. The advantages and limitations of each of these techniques are discussed and typical results are presented.

  • 249.
    Claesson, PM
    et al.
    YKI – Ytkemiska institutet.
    Fielden, ML
    Dedinaite, A
    YKI – Ytkemiska institutet.
    Brown, W
    Fundin, J
    Interactions between a 30% charged polyelectrolyte and an anionic surfactant in bulk and at a solid-liquid interface1998Ingår i: Journal of Physical Chemistry B, ISSN 1520-6106, E-ISSN 1520-5207, Vol. 102, s. 1270-1278Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The association between a 30% charged cationic polyelectrolyte and an anionic surfactant, sodium dodecyl sulfate (SDS), in 10 mM 1:1 electrolyte was investigated using surface force measurements and dynamic light scattering. The polyelectrolyte employed was a random copolymer of the neutral acrylamide and cationic [3-(2-methylpropionamide)propyl]trimethylammonium chloride (AM-MAPTAC-31). Light scattering measurements show that upon progressive addition of SDS to an AM-MAPTAC-31 solution the single coil size decreases until precipitation occurs at an SDS/MAPTAC ratio of just above 0.4. At SDS/MAPTAC ratios at or above 2, redispersion of the aggregates takes place. The interfacial behavior of AM-MAPTAC-31/SDS complexes was investigated in two ways. In one set of experiments a droplet containing a mixture of SDS and AM-MAPTAC-31 was placed between the surfaces and adsorption was allowed to occur from the aqueous mixture. It was found that the range of the steric force decreased when the SDS/MAPTAC ratio was increased from 0 to 0.4, indicating adsorption in a less extended conformation due to a decreased repulsion between the polyelectrolyte segments. At a ratio of 0.6 a compact interfacial complex was formed and the measured force was attractive over a small distance regime. A further increase in SDS/MAPTAC ratio resulted in precipitation of large aggregates at the surface, and reproducible force data could not be obtained. At an even higher SDS/AM-MAPTAC ratio of 4, individual aggregates were once again adsorbed at the surface. Hence, we find a good correspondence between association in bulk and at the solid surface. In another set of experiments the polyelectrolyte was first preadsorbed to mica surfaces and then SDS was added to the polyelectrolyte-free solution surrounding the surfaces. In this way precipitation of large SDS-polyelectrolyte aggregates onto the surfaces was avoided. Addition of SDS up to a concentration of 0.1 mM hardly affected the long-range interaction but gave an increased compressed layer thickness. A further increase in SDS concentrations to 1 mM results in a dramatic increase in the range of the force, suggesting formation of strongly negatively charged polyelectrolyte-surfactant complexes.

  • 250.
    Claesson, PM
    et al.
    YKI – Ytkemiska institutet.
    Gölander, C-G
    Direct measurements of steric interactions between mica surfaces covered with electrostatically bound low-molecular-weight polyethylene oxide1987Ingår i: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 117, s. 366-374Artikel i tidskrift (Refereegranskat)
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