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  • 1.
    Alvarez-Asencio, Ruben
    et al.
    RISE - Research Institutes of Sweden (2017-2019), Biovetenskap och material.
    Corkery, Robert W.
    KTH Royal Institute of Technology, Sweden.
    Ahniyaz, Anwar
    RISE - Research Institutes of Sweden (2017-2019), Biovetenskap och material.
    Solventless synthesis of cerium oxide nanoparticles and their application in UV protective clear coatings2020Inngår i: RSC Advances, E-ISSN 2046-2069, Vol. 10, nr 25, s. 14818-14825Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Colloidal dispersions of cerium oxide nanoparticles are of importance for numerous applications including as catalysts, chemical mechanical polishing agents and additives for UV protective and anticorrosion coatings. Here, concentrated oleate-coated cerium oxide nanoparticles (CeO2 NPs) with a uniform size have been produced by solventless thermolysis of cerium-oleate powder under low pressure at 320 °C and subsequently dispersed in hexane. Unlike any previously reported colloidal synthesis process for ceria nanoparticles, this process does not involve any toxic high boiling point organic solvent that requires subsequent removal at high cost. Although the process is very simple, highly concentrated cerium oxide nanoparticles with more than 17 wt% solid content and 70% of the theoretical yield can be easily obtained. Moreover, the size, shape and crystallinity of cerium oxide nanoparticles can be tailored by changing the thermal decomposition temperature and reaction time. Moreover, the new synthesis route developed in this study allows the synthesis of clean and dispersible ceria nanoparticles at a relatively low cost in a single step. The prepared ceria nanoparticles have an excellent UV absorption property and remain transparent to visible light, thus having the potential to replace potentially hazardous organic compounds in UV absorbing clear coatings. As a proof of concept, the prepared dispersions of cerium oxide nanoparticles in hexane were formulated into a solvent borne binder base to develop clear UV protecting coatings for light sensitive substrates. The general synthesis strategy presented in this study is generally applicable for the low-cost production of a concentrated dispersion of metal oxide nanoparticles with minimal environmental impact.

  • 2.
    Amin, Sidra
    et al.
    Luleå University of Technology, Sweden; University of Sindh, Pakistan´; Shaheed Benazir Bhutto University, Pakistan .
    Tahira, Aneela
    Luleå University of Technology, Sweden .
    Solangi, Amber
    University of Sindh, Pakistan.
    Beni, Valerio
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Morante, JR
    Catalonia Institute for Energy Research, Spain.
    Liu, Xianjie
    Linköping University, Sweden.
    Falhman, Mats
    Linköping University, Sweden.
    Mazzaro, Raffaello
    Luleå University of Technology, Sweden .
    Ibupoto, Zafar
    Luleå University of Technology, Sweden .
    Vomiero, Alberto
    Luleå University of Technology, Sweden .
    A practical non-enzymatic urea sensor based on NiCo 2 O 4 nanoneedles2019Inngår i: RSC Advances, E-ISSN 2046-2069, Vol. 9, nr 25, s. 14443-14451Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We propose a new facile electrochemical sensing platform for determination of urea, based on a glassy carbon electrode (GCE) modified with nickel cobalt oxide (NiCo 2 O 4 ) nanoneedles. These nanoneedles are used for the first time for highly sensitive determination of urea with the lowest detection limit (1 μM) ever reported for the non-enzymatic approach. The nanoneedles were grown through a simple and low-temperature aqueous chemical method. We characterized the structural and morphological properties of the NiCo 2 O 4 nanoneedles by TEM, SEM, XPS and XRD. The bimetallic nickel cobalt oxide exhibits nanoneedle morphology, which results from the self-assembly of nanoparticles. The NiCo 2 O 4 nanoneedles are exclusively composed of Ni, Co, and O and exhibit a cubic crystalline phase. Cyclic voltammetry was used to study the enhanced electrochemical properties of a NiCo 2 O 4 nanoneedle-modified GCE by overcoming the typical poor conductivity of bare NiO and Co 3 O 4 . The GCE-modified electrode is highly sensitive towards urea, with a linear response (R 2 = 0.99) over the concentration range 0.01-5 mM and with a detection limit of 1.0 μM. The proposed non-enzymatic urea sensor is highly selective even in the presence of common interferents such as glucose, uric acid, and ascorbic acid. This new urea sensor has good viability for urea analysis in urine samples and can represent a significant advancement in the field, owing to the simple and cost-effective fabrication of electrodes, which can be used as a promising analytical tool for urea estimation.

  • 3.
    Arrhenius, Karine
    et al.
    RISE Research Institutes of Sweden, Material och produktion, Kemi, biomaterial och textil.
    Fischer, Andreas
    RISE Research Institutes of Sweden, Material och produktion, Kemi, biomaterial och textil.
    Büker, Oliver
    RISE Research Institutes of Sweden, Säkerhet och transport, Mätteknik.
    Adrien, Herve
    INERIS Parc Alata, France.
    El Masri, Ahmad
    INERIS Parc Alata, France.
    Lestremau, Francois
    INERIS Parc Alata, France.
    Robinson, Tim
    Waverton Analytics Ltd, UK.
    Analytical methods for the determination of oil carryover from CNG/biomethane refueling stations recovered in a solvent2020Inngår i: RSC Advances, E-ISSN 2046-2069, Vol. 10, nr 20, s. 11907-11917Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Vehicle gas is often compressed to about 200 bar at the refueling station prior to charging to the vehicle's tank. If a high amount of oil is carried over to the gas, it may cause damage to the vehicles; it is therefore necessary to accurately measure oil carryover. In this paper, three analytical methods for accurate quantification of the oil content are presented whereby two methods are based on gas chromatography and one on FTIR. To better evaluate the level of complexity of the matrix, 10 different compressor oils in use at different refueling stations were initially collected and analysed with GC and FTIR to identify their analytical traces. The GC traces could be divided into three different profiles: oils exhibiting some well resolved peaks, oils exhibiting globally unresolved peaks with some dominant peaks on top of the hump and oils exhibiting globally unresolved peaks. After selection of three oils; one oil from each type, the three methods were evaluated with regards to the detection and quantification limits, the working range, precision, trueness and robustness. The evaluation of the three measurement methods demonstrated that any of these three methods presented were suitable for the quantification of compressor oil for samples. The FTIR method and the GC/MS method both resulted in measurement uncertainties close to 20% rel. while the GC/FID method resulted in a higher measurement uncertainty (U = 30% rel.).

  • 4.
    Attard, Thohmas. M.
    et al.
    University of York, UK.
    Theeuwes, Elke
    Ecover Co-ordination Center NV, Belgium.
    Gomez, Leonardo D.
    University of York, UK.
    Johansson, Emma
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Processum.
    Dimitriou, Ioanna
    University of Sheffield, UK.
    Wright, Phillip C.
    University of Sheffield, UK.
    Clark, James H.
    University of Sheffield, UK.
    McQueen-Mason, Simon J.
    University of York, UK.
    Hunt, Andrew J.
    University of York, UK.
    Supercritical extraction as an effective first-step in a maize stover biorefinery2015Inngår i: RSC Advances, E-ISSN 2046-2069, Vol. 5, nr 54, s. 43831-43838Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Supercritical carbon dioxide (scCO<inf>2</inf>) has been investigated for the generation of valuable waxy compounds and as an added-value technology in a holistic maize stover biorefinery. ScCO<inf>2</inf> extraction and fractionation was carried out prior to hydrolysis and fermentation of maize stover. Fractionation of the crude extracts by scCO<inf>2</inf> resulted in wax extracts having different compositions and melting temperatures, enabling their utilisation in different applications. One such fraction demonstrated significant potential as a renewable defoaming agent in washing machine detergent formulations. Furthermore, scCO<inf>2</inf> extraction has been shown to have a positive effect on the downstream processing of the maize stover. Fermentation of the scCO<inf>2</inf> extracted maize stover hydrolysates exhibited a higher glucose consumption and greater potential growth for surfactant (in comparison with non-scCO<inf>2</inf> treated stover) axnd ethanol production (a 40% increase in overall ethanol production after scCO<inf>2</inf> pre-treatment). This work represents an important development in the extraction of high value components from low value wastes and demonstrates the benefits of using scCO<inf>2</inf> extraction as a first-step in biomass processing, including enhancing downstream processing of the biomass for the production of 2nd generation biofuels as part of an integrated holistic biorefinery.

  • 5. Bodvik, Rasmus
    et al.
    Thormann, Esben
    Karlsson, Leif
    Claesson, Per M
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, YKI – Ytkemiska institutet.
    Temperature-dependent adsorption of cellulose ethers on silica and hydrophobized silica immersed in aqueous polymer solution2011Inngår i: RSC Advances, E-ISSN 2046-2069, Vol. 1, nr 2, s. 305-314Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The influence of temperature on adsorption and the adsorbed layer properties of methylcellulose (MC) and hydroxypropylmethylcellulose (HPMC) were investigated on silica and hydrophobized silica surfaces immersed in aqueous polymer solution. To achieve a concise understanding a quartz crystal microbalance with dissipation, ellipsometry, and atomic force microscopy imaging were employed. These techniques provide complimentary information on the structure, mass and viscoelastic properties of the polymer layers. Adsorption was first allowed at 25 degrees C. Next, the temperature was increased step-wise up to 50 degrees C and then decreased again. This procedure highlights the temperature dependence of the adsorbed material, as well as the hysteresis in the adsorption due to temperature cycling. A change in temperature not only affects the adsorbed amount, but also the properties of the layer as illustrated by measurements of its water content, thickness and viscoelasticity.

  • 6.
    Carmona, Pierre
    et al.
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Jordbruk och livsmedel. Chalmers University of Technology, Sweden.
    von Corswant, Christian
    AstraZeneca, Sweden.
    Röding, Magnus
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Jordbruk och livsmedel. Chalmers University of Technology, Sweden; Gothenburg University, Sweden.
    Särkkä, Aila
    Chalmers University of Technology, Sweden; Gothenburg University, Sweden.
    Olsson, Eva
    Chalmers University of Technology, Sweden.
    Loren, Niklas
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Jordbruk och livsmedel. Chalmers University of Technology, Sweden.
    Cross-sectional structure evolution of phase-separated spin-coated ethylcellulose/hydroxypropylcellulose films during solvent quenching2022Inngår i: RSC Advances, E-ISSN 2046-2069, Vol. 12, nr 40, s. 26078-26089Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Porous phase-separated ethylcellulose/hydroxypropylcellulose (EC/HPC) films are used to control drug transport out of pharmaceutical pellets. The films are applied on the pellets using fluidized bed spraying. The drug transport rate is determined by the structure of the porous films that are formed as the water-soluble HPC leaches out. However, a detailed understanding of the evolution of the phase-separated structure during production is lacking. Here, we have investigated EC/HPC films produced by spin-coating, which mimics the industrial manufacturing process. This work aimed to understand the structure formation and film shrinkage during solvent evaporation. The cross-sectional structure evolution was characterized using confocal laser scanning microscopy (CLSM), profilometry and image analysis. The effect of the EC/HPC ratio on the cross-sectional structure evolution was investigated. During shrinkage of the film, the phase-separated structure undergoes a transition from 3D to nearly 2D structure evolution along the surface. This transition appears when the typical length scale of the phase-separated structure is on the order of the thickness of the film. This was particularly pronounced for the bicontinuous systems. The shrinkage rate was found to be independent of the EC/HPC ratio, while the initial and final film thickness increased with increasing HPC fraction. A new method to estimate part of the binodal curve in the ternary phase diagram for EC/HPC in ethanol has been developed. The findings of this work provide a good understanding of the mechanisms responsible for the morphology development and allow tailoring of thin EC/HPC films structure for controlled drug release. 

  • 7.
    Coseri, Sergiu
    et al.
    Romanian Academy, Romania.
    Biliuta, Gabriela
    Romanian Academy, Romania.
    Zemlijic, Lidija Fras
    University of Maribor, Slovenia.
    Stevanic Srndovic, Jasna
    RISE., Innventia.
    Larsson, Per Tomas
    RISE., Innventia.
    Strnad, Simona
    University of Maribor, Slovenia.
    Kreze, Tatjana
    University of Maribor, Slovenia.
    Naderi, Ali
    RISE., Innventia.
    Lindström, Tom
    RISE., Innventia.
    Correction: One-shot carboxylation of microcrystalline cellulose in the presence of nitroxyl radicals and sodium periodate2015Inngår i: RSC Advances, E-ISSN 2046-2069, Vol. 5, nr 117, s. 96927-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Correction for ‘One-shot carboxylation of microcrystalline cellulose in the presence of nitroxyl radicals and sodium periodate’ by Sergiu Coseri et al.RSC Adv., 2015, 5, 85889–85897.

    The authors regret that the images presented for Fig. 1 and 3 in the original article present incorrect carbohydrate structures. The amended versions of these images, in which the 3-position hydroxyl groups are equatorial rather than axial, are presented below.

    Fulltekst (pdf)
    fulltext
  • 8.
    Coseri, Sergiu
    et al.
    Romanian Academy, Romania.
    Biliuta, Gabriela
    Romanian Academy, Romania.
    Zemlijic, Lidija Fras
    University of Maribor, Slovenia.
    Stevanic Srndovic, Jasna
    RISE., Innventia.
    Larsson, Per Tomas
    RISE., Innventia.
    Strnad, Simona
    University of Maribor, Slovenia.
    Kreze, Tatjana
    University of Maribor, Slovenia.
    Naderi, Ali
    RISE., Innventia.
    Lindström, Tom
    RISE., Innventia.
    One-shot carboxylation of microcrystalline cellulose in the presence of nitroxyl radicals and sodium periodate2015Inngår i: RSC Advances, E-ISSN 2046-2069, Vol. 5, nr 104, s. 85889-85897Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Water soluble cellulose derivatives are highly required products for many practical purposes, expanding the limited applications of pure cellulose caused by the highly ordered hydrogen bond network and high crystallinity. In this connection, this paper, presents a new approach to obtain water soluble carboxyl-functionalized cellulosic materials, combining two of the most common selective oxidation protocols for cellulose, i.e. nitroxyl mediated reaction and periodate oxidation, in a one-shot reaction. It was found that, under specific reaction conditions, fully oxidized, 2,3,6-tricarboxy cellulose can be obtained in large amounts. The other valuable oxidized fractions were found to possess large amounts of carboxylic groups, as determined by potentiometric titration. 13C-NMR evidenced the presence of three distinctive carboxylic groups in the fully oxidized product, whereas for the partially oxidized samples, 13C CP-MAS solid-state NMR did not detect any carbonyl signals. The oxidized products were characterized by means of FTIR and X-ray photoelectron spectroscopy (XPS). Moreover, the changes of the degree of polymerization occurring after oxidative treatments were viscometrically determined.

  • 9.
    Gu, Yuanyu
    et al.
    Nanjing Tech University, China; University of Zaragoza, Spain.
    Yoshikiyo, Marie
    Namai, Asuka
    University of Tokyo, Japan.
    Bonvin, Debora
    Ecole Polytechnique Fédérale de Lausanne, Switzerland .
    Martinez, Abelarda
    Universidad de Zaragoza, Spain .
    Piñol, Rafael
    University of Zaragoza, Spain.
    Téllez, Pedro
    Universidad de Zaragoza, Spain .
    Silva, Nuno
    Universidade de Aveiro, Portugal .
    Ahrentorp, Fredrik
    RISE Research Institutes of Sweden, Digitala system, Smart hårdvara.
    Johansson, Christer
    RISE Research Institutes of Sweden, Digitala system, Smart hårdvara.
    Marco-Brualla, Joaquin
    Universidad de Zaragoza, Spain .
    Moreno-Loshuertos, Raquel
    Universidad de Zaragoza, Spain .
    Fernández-Silva, Patricio
    Universidad de Zaragoza, Spain .
    Cui, Yuwen
    Nanjing Tech University, China .
    Ohkoshi, Shin-ichi
    University of Tokyo, Japan.
    Millán, Angel
    University of Zaragoza, Spain.
    Magnetic hyperthermia with ϵ-Fe2O3nanoparticles2020Inngår i: RSC Advances, E-ISSN 2046-2069, Vol. 10, nr 48, s. 28786-28797Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Biocompatibility restrictions have limited the use of magnetic nanoparticles for magnetic hyperthermia therapy to iron oxides, namely magnetite (Fe3O4) and maghemite (γ-Fe2O3). However, there is yet another magnetic iron oxide phase that has not been considered so far, in spite of its unique magnetic properties: ϵ-Fe2O3. Indeed, whereas Fe3O4 and γ-Fe2O3 have a relatively low magnetic coercivity, ϵ-Fe2O3 exhibits a giant coercivity. In this report, the heating power of ϵ-Fe2O3 nanoparticles in comparison with γ-Fe2O3 nanoparticles of similar size (∼20 nm) was measured in a wide range of field frequencies and amplitudes, in uncoated and polymer-coated samples. It was found that ϵ-Fe2O3 nanoparticles primarily heat in the low-frequency regime (20-100 kHz) in media whose viscosity is similar to that of cell cytoplasm. In contrast, γ-Fe2O3 nanoparticles heat more effectively in the high frequency range (400-900 kHz). Cell culture experiments exhibited no toxicity in a wide range of nanoparticle concentrations and a high internalization rate. In conclusion, the performance of ϵ-Fe2O3 nanoparticles is slightly inferior to that of γ-Fe2O3 nanoparticles in human magnetic hyperthermia applications. However, these ϵ-Fe2O3 nanoparticles open the way for switchable magnetic heating owing to their distinct response to frequency. 

  • 10.
    Hua, Kai
    et al.
    Uppsala University, Sweden.
    Carlsson, Daniel O.
    Uppsala University, Sweden.
    Ålander, Eva M.
    RISE., Innventia.
    Lindström, Tom
    RISE., Innventia.
    Strömme, Maria
    RISE., Innventia.
    Mihranyan, Albert
    Uppsala University, Sweden.
    Ferraz, Natalia
    Uppsala University, Sweden.
    Translational study between structure and biological response of nanocellulose from wood and green algae2014Inngår i: RSC Advances, E-ISSN 2046-2069, Vol. 4, nr 6, s. 2892-2903Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The influence of nanostructure on the cytocompatibility of cellulose films is analyzed providing insight into how physicochemical properties of surface modified microfibrillated cellulose (MFC) and Cladophora nanocellulose (CC) affect the materials cytocompatibility. CC is modified through TEMPO-mediated oxidation and glycidyltrimethylammonium chloride (EPTMAC) condensation to obtain anionic and cationic nanocellulose samples respectively, while anionic and cationic MFC samples are obtained by carboxymethylation and EPTMAC condensation respectively. Films of unmodified, anionic and cationic MFC and CC are prepared by vacuum filtration and characterized in terms of specific surface area, pore size distribution, degree of crystallinity, surface charge and water content. Human dermal fibroblasts are exposed to culture medium extracts of the films in an indirect contact cytotoxicity test. Moreover, cell adhesion and viability are evaluated in a direct contact assay and the effects of the physicochemical properties on cell behavior are discussed. In the indirect cytotoxicity test no toxic leachables are detected, evidencing that the CC and MFC materials are non-cytotoxic, independently of the chemical treatment that they have been subjected to. The direct contact tests show that carboxymethylated-MFC presents a more cytocompatible profile than unmodified and trimethylammonium-MFC. TEMPO-CC promotes fibroblast adhesion and presents cell viability comparable to the results obtained with the tissue culture material Thermanox. We hypothesize that the distinct aligned nanofiber structure present in the TEMPO-CC films is responsible for the improved cell adhesion. Thus, by controlling the surface properties of cellulose nanofibers, such as chemistry, charge, and orientation, cell adhesion properties can be promoted.

  • 11.
    Johansson Salazar-Sandoval, Eric
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor.
    Ahniyaz, Anwar
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor.
    Radical initiator modified cerium oxide nanoparticles for polymer encapsulation via grafting from the surface2014Inngår i: RSC Advances, E-ISSN 2046-2069, Vol. 4, nr 106, s. 61863-61868Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The present paper describes a versatile route to modify and stabilize ceria nanoparticles with a radical initiator, 4,4′-azobis(4-cyanovaleric acid) (ACVA), allowing a strong interface to be formed via grafting of polymers from the surface. This leads to the successful encapsulation of cerium oxide nanoparticles in a poly(methyl methacrylate) matrix. The interaction between the radical initiator and the surface of ceria is studied by FTIR spectroscopy where a consistent shift of the carboxylate band unequivocally demonstrates that the carboxylate groups of this acidic initiatorcomplex the cerium ions on the ceria surface by means of strong and stable ionic bonding.

  • 12.
    Johansson Salazar-Sandoval, Eric
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor. KTH Royal Institute of Technology, Sweden.
    Johansson, M. K. G.
    KTH Royal Institute of Technology, Sweden.
    Ahniyaz, Anwar
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor.
    Aminopolycarboxylic acids as a versatile tool to stabilize ceria nanoparticles-a fundamental model experimentally demonstrated2014Inngår i: RSC Advances, E-ISSN 2046-2069, Vol. 4, nr 18, s. 9048-9055Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    An extremely stable water dispersion of cerium oxide nanoparticles was prepared by colloidal synthesis, using nitrilotriacetic acid (NTA) as a stabilizer. Based on FT-IR measurements, the surface characteristics of NTA-stabilized ceria nanoparticles are clarified and a fundamental stabilization mechanism is proposed. The mechanism is based on the combination of the ionic nature of cerium oxide surface and the inner-sphere complexation model. From an application perspective it is remarkable that ceria nanoparticle dispersions stabilized by NTA are stable at neutral pH, which makes them a potential successful additive in UV screening applications.

  • 13.
    Josefsson, Gabriella
    et al.
    Uppsala University, Sweden.
    Chinga-Carrasco, Gary
    RISE., Innventia, PFI – Paper and Fiber Research Institute.
    Gamstedt, E. Kristofer
    Uppsala University, Sweden.
    Elastic models coupling the cellulose nanofibril to the macroscopic film level2015Inngår i: RSC Advances, E-ISSN 2046-2069, Vol. 5, nr 71, s. 58091-58099Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The mechanical behaviour of cellulose nanofibrils is typically characterized by casting thin films and performing tensile tests on strips cut from these films. When comparing the stiffness of different films, the stiffness of the nanofibrils is only qualitatively and indirectly compared. This study provides some schemes based on various models of fibre networks, or laminated films, which can be used to assess the inherent stiffness of the nanofibrils from the stiffness of the films. Films of cellulose nanofibrils from different raw materials were manufactured and the elastic properties were measured. The expressions relating the nanofibril stiffness and the film stiffness were compared for the presented models. A model based on classical laminate theory showed the best balance between simplicity and adequacy of the underlying assumptions among the presented models. Using this model, the contributing nanofibril stiffness was found to range from 20 to 27 GPa. The nanofibril stiffness was also calculated from mechanical properties of nanofibril films found in the literature and compared with measurements from independent test methods of nanofibril stiffness. All stiffness values were found to be comparable and within the same order of magnitude.

  • 14.
    Junker, Katja
    et al.
    ETH Zürich, Switzerland.
    Zandomeneghi, Giorgia
    ETH Zürich, Switzerland.
    Guo, Zengwei
    RISE - Research Institutes of Sweden (2017-2019), Material och produktion, IVF.
    Kissner, Reinhard
    ETH Zürich, Switzerland.
    Ishikawa, Takashi
    Paul Scherrer Institute, Switzerland.
    Kohlbrecher, Joachim
    ETH Zürich, Switzerland; Paul Scherrer Institute, Switzerland.
    Walde, Peter
    ETH Zürich, Switzerland.
    Mechanistic aspects of the horseradish peroxidase-catalysed polymerisation of aniline in the presence of AOT vesicles as templates2012Inngår i: RSC Advances, E-ISSN 2046-2069, Vol. 2, nr 16, s. 6478-6495Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The mechanism of the horseradish peroxidase (HRP)-H2O 2-catalysed polymerisation of aniline in the presence of AOT vesicles was investigated. AOT (= bis-(2-ethylhexyl)sulfosuccinate) served as vesicle-forming surfactant and dopant for obtaining at pH = 4.3 and room temperature within 24 h under optimal reaction conditions the green emeraldine salt form of polyaniline in 90-95% yield. Based on UV/VIS/NIR and EPR measurements carried out during the polymerisation reaction, and based on changes in aniline and H2O2 concentrations and HRP activity, a mechanism is proposed. According to this "radical cation mechanism" chain growth occurs on the vesicle surface through addition of aniline radical cations to the growing polymer chain. H2O2 plays two essential roles, to oxidise the heme group of HRP, and to oxidise the growing polymer chain for allowing the stepwise addition of new aniline radical cations. The entire reaction can be divided into three kinetically distinct phases. In the first rapid phase (5-10 min), the actual polymer formation takes place to yield the emeraldine salt form of polyaniline in its bipolaron state. In the second and third slower phases (1-2 days) the bipolarons transform into polarons with unpaired electrons. During the reaction, the HRP activity is decreasing until the enzyme becomes inactive after polymer formation. Reactions carried out with partially deuterated anilines were analysed by 2H magic-angle spinning (MAS) NMR spectroscopy to demonstrate the regioselectivity of the chain growth: para-coupling of the aniline units clearly dominates. Association of the formed polyaniline with the vesicle membrane is evident from cryo-TEM and SANS measurements.

  • 15.
    Karalė, Kristina
    et al.
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Kemiska processer och läkemedel. Karolinska Institute, Sweden.
    Bollmark, Martin
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Kemiska processer och läkemedel.
    Karalius, Antanas
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Kemiska processer och läkemedel.
    Lopes, Mónica
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Kemiska processer och läkemedel. University of Southampton, UK.
    Perez, Oswaldo
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Kemiska processer och läkemedel. University of Iceland, Iceland.
    Strömberg, Roger
    Karolinska Institute, Sweden.
    Tedebark, Ulf
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Kemiska processer och läkemedel.
    Synthesis and stability studies of bicyclo[6.1.0]nonyne scaffolds for automated solid-phase oligonucleotide synthesis2024Inngår i: RSC Advances, E-ISSN 2046-2069, Vol. 14, nr 25, s. 17406-17412Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Two novel bicyclo[6.1.0]nonyne (BCN) linker derivatives, which can be directly incorporated into oligonucleotide sequences during standard automated solid-phase synthesis, are reported. Stabilities of BCN-carbinol and two BCN-oligonucleotides are evaluated under acidic conditions. In addition, derivatized BCN linkers (non-acidic and acid treated) are evaluated for strain-promoted alkyne-azide cycloaddition (SPAAC). 

    Fulltekst (pdf)
    fulltext
  • 16.
    Kuktaite, Ramune
    et al.
    SLU Swedish University of Agricultural Sciences, Sweden.
    Plivelic, Tomás S.
    Lund University, Sweden.
    Ture, Hasan
    KTH Royal Institute of Technology, Sweden.
    Hedenqvist, Mikael Stefan
    KTH Royal Institute of Technology, Sweden.
    Gällstedt, Mikael
    RISE., Innventia.
    Marttila, Salla
    SLU Swedish University of Agricultural Sciences, Sweden.
    Johansson, Eva
    SLU Swedish University of Agricultural Science, Sweden.
    Changes in the hierarchical protein polymer structure: Urea and temperature effects on wheat gluten films2012Inngår i: RSC Advances, E-ISSN 2046-2069, Vol. 2, nr 31, s. 11908-11914Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Understanding bio-based protein polymer structures is important when designing new materials with desirable properties. Here the effect of urea on the wheat gluten (WG) protein structure in WG-urea films was investigated. Small-angle X-ray scattering indicated the formation of a hexagonal close-packed (HCP) hierarchical structure in the WG-urea materials. The HCP structure was influenced significantly by the urea concentration and processing conditions. The interdomain distance d I between the HCP scattering objects increased with increasing content of urea and the objects seemed to be oriented in the extrusion direction. Additionally, the effect of temperature on the HCP structure was studied and it was shown that at ≥55°C the HCP structure disappeared. Transmission electron microscopy revealed a rather denatured pattern of both HMW-glutenins and gliadins in the WG-urea films. The molecular packing of the WG protein polymer can be highly affected by an additive and the processing method used.

  • 17.
    Li, Jing
    et al.
    KTH Royal Institute of Technology, Sweden.
    Huang, Hui
    KTH Royal Institute of Technology, Sweden.
    Fielden, Matthew
    KTH Royal Institute of Technology, Sweden.
    Pan, Jinshan
    KTH Royal Institute of Technology, Sweden.
    Ecco, Luiz
    University of Trento, Italy.
    Schellbach, Carsten
    Enthone GmbH, Germany.
    Delmas, Grégory
    Arkema Coating Resins, France.
    Claesson, Per Martin
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Material och ytteknik. KTH Royal Institute of Technology, Sweden.
    Towards the mechanism of electrochemical activity and self-healing of 1 wt% PTSA doped polyaniline in alkyd composite polymer coating: Combined AFM-based studies2016Inngår i: RSC Advances, E-ISSN 2046-2069, Vol. 6, nr 23, s. 19111-19127Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A composite solvent-borne alkyd coating with 1 wt% p-toluene sulfonic acid (PTSA) doped polyaniline (PANI) was prepared. The mechanisms of electrochemical activity and self-healing properties of the composite coating were investigated by in situ atomic force microscopy (AFM), intermodulation AFM (ImAFM), electrochemical controlled (EC)-AFM combined with cyclic voltammetry (CV), Kelvin force microscopy (KFM), and Fourier transform infrared spectroscopy (FTIR), as well as open-circuit potential (OCP) and electrochemical impedance spectroscopy (EIS) methods. The ImAFM demonstrates the multiphase structure of the composite coating and a high compatibility between the doped PANI and alkyd matrix. The CV and EC-AFM results reveal a high electrochemical activity of the doped PANI in the composite coating as well as reversible redox reactions between the emeraldine salt (ES) and leuco emeraldine base (LB) forms. The Volta potential mapping of KFM demonstrates a strong self-healing ability of the doped PANI in air conditions. The good electrochemical connection between the fine network of PANI in the composite coating and metal surface underneath enable the occurrence of reversible redox reaction between the ES/LB forms of doped PANI and a concomitant release of dopant anions both in air and in 3 wt% NaCl solution as demonstrated by OCP and EIS results. These therefore lead to the strong passivation and self-healing effect of the composite coated on the carbon steel surface.

  • 18.
    Luige, Olivia
    et al.
    Karolinska Institute, Sweden.
    Karalė, Kristina
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Kemiska processer och läkemedel. Karolinska Institute, Sweden.
    Bose, Partha
    Karolinska Institute, Sweden.
    Bollmark, Martin
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Kemiska processer och läkemedel.
    Tedebark, Ulf
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Kemiska processer och läkemedel.
    Murtola, Merita
    Karolinska Institute, Sweden.
    Strömberg, Roger
    Karolinska Institute, Sweden.
    Influence of sequence variation on the RNA cleavage activity of Zn2+-dimethyl-dppz-PNA-based artificial enzymes2022Inngår i: RSC Advances, E-ISSN 2046-2069, Vol. 12, nr 9, s. 5398-5406Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The development of Zn2+-dependent dimethyl-dppz-PNA conjugates (PNAzymes) as efficient site-specific artificial ribonucleases enables rapid sequence-specific degradation of clinically relevant RNA target sequences, but the significance of the RNA/PNAzyme sequence and structural demands for the identification of novel RNA targets are not fully understood. In the present study, we investigated the influence of sequence variation in the recognition arms of the RNA/PNAzyme complex on the RNA cleavage activity of the artificial enzymes. The base pairs closing the 3-nucleotide bulge region on both sides of the bulge as well as the neighbouring nucleobases were shown to significantly influence the RNA cleavage activity. Elongation of the RNA/PNAzyme complex was shown to be tolerated, although potentially prohibitive for catalytic turnover. The specificity of PNAzyme action was clearly demonstrated by the significantly reduced or absent cleavage activity in complexes containing mismatches. Further investigation into 2- and 4-nucleotide RNA bulges indicated that formation of 3-nucleotide bulges in the target RNA gives the optimal cleavage rates, while some potential off-target cleavage of formed 4-nucleotide bulges of select sequences should be considered. 

  • 19.
    Mille, Christian B.
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor. Stockholm University, Sweden.
    Tyrode, Eric C.
    KTH Royal Institute of Technology, Sweden.
    Corkery, Robert W.
    KTH Royal Institute of Technology, Sweden.
    3D titania photonic crystals replicated from gyroid structures in butterfly wing scales: Approaching full band gaps at visible wavelengths2013Inngår i: RSC Advances, E-ISSN 2046-2069, Vol. 3, nr 9, s. 3109-3117Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    3D titania photonic crystals are replicated from single gyroid structures found in the butterfly Callophrys rubi. Photonic crystals were characterised using SEM imaging, X-ray and Raman scattering and reflection spectroscopy. The overall symmetry and topology of the original single gyroid structures is replicated with high fidelity. Titania replicas display photonic responses that are thermal history dependent. Replicas treated at 700 °C, show up to 96% reflectivity at ∼505 nm, while at lower and higher treatment temperatures the photonic response was not as pronounced. Simulated band structures fitted to the observed spectral reflectivity data constrain the solid volume fractions and dielectric constants of the replicas. The titania photonic crystals were also found to be optically active, with both left- and right-handed single gyroids contributing to the chiral response. The 3D titania photonic crystals replicated here have nearly complete overlapping of partial band gaps, strongly suggesting that materials with full photonic band gaps are experimentally within reach using the general replication approach reported here.

  • 20.
    Newson, William R.
    et al.
    SLU Swedish University of Agricultural Sciences, Sweden.
    Rasheed, Faiza
    SLU Swedish University of Agricultural Sciences, Sweden.
    Kuktaite, Ramune
    SLU Swedish University of Agricultural Sciences, Sweden.
    Hedenqvist, Mikael S.
    KTH Royal Institute of Technology, Sweden.
    Gällstedt, Mikael
    RISE., Innventia.
    Plivelic, Tomás S.
    Lund University, Sweden.
    Johansson, Eva
    SLU Swedish University of Agricultural Sciences, Sweden.
    Commercial potato protein concentrate as a novel source for thermoformed bio-based plastic films with unusual polymerisation and tensile properties2015Inngår i: RSC Advances, E-ISSN 2046-2069, Vol. 5, nr 41, s. 32217-32226Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Commercial potato protein concentrate (PPC) was investigated as a source of thermoformed bio-based plastic film. Pressing temperatures of 100 to 190°C with 15 to 25% glycerol were used to form PPC films. The shape of the tensile stress-strain curve in thermoformed PPC was controlled by glycerol level and was independent of processing temperature. Tensile testing revealed that elongation at break increased with processing temperature while Young's modulus was unaffected by processing temperature, both in contrast to previous results in protein based systems. Also in contrast to previous studies, Young's modulus was found to be only sensitive to glycerol level. Maximum tensile stress increased with increasing processing temperature for PPC films. Maximum stress and strain at break correlated with the extractable high molecular weight protein content of the processed films measured with size exclusion chromatography. Infrared absorption indicated that the content of β-sheet structure increased from the commercial protein concentrate to that pressed at 100°C, but did not further develop with increasing press temperature. Changes in structural arrangements were observed by small angle X-ray scattering indicating the development of different correlation distances with processing temperature but with no clear long range order at the supramolecular level. The novel Young's modulus behaviour appears to be due to constant secondary structure or the effect of aggregated protein structure formed during protein production. Unique strain at break behaviour with processing temperature was demonstrated, likely due to new connections formed between those aggregates.

  • 21. Rasheed, Faiza
    et al.
    Newson, William R
    Plivelic, Tomas S
    Kuktaite, Ramune
    Hedenqvist, Mikael S
    Gällstedt, Mikael
    RISE., Innventia.
    Johansson, Eva
    Structural architecture and solubility of native and modified gliadin and glutenin proteins: non-crystalline molecular and atomic organization2014Inngår i: RSC Advances, E-ISSN 2046-2069, nr 4, s. 2051-2060Artikkel i tidsskrift (Fagfellevurdert)
  • 22.
    Ruwoldt, Jost
    et al.
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Heen Blindheim, Fredrik
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Chinga Carrasco, Gary
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Functional surfaces, films, and coatings with lignin - a critical review2023Inngår i: RSC Advances, E-ISSN 2046-2069, Vol. 13, nr 18, s. 12529-12553Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Lignin is the most abundant polyaromatic biopolymer. Due to its rich and versatile chemistry, many applications have been proposed, which include the formulation of functional coatings and films. In addition to replacing fossil-based polymers, the lignin biopolymer can be part of new material solutions. Functionalities may be added, such as UV-blocking, oxygen scavenging, antimicrobial, and barrier properties, which draw on lignin's intrinsic and unique features. As a result, various applications have been proposed, including polymer coatings, adsorbents, paper-sizing additives, wood veneers, food packaging, biomaterials, fertilizers, corrosion inhibitors, and antifouling membranes. Today, technical lignin is produced in large volumes in the pulp and paper industry, whereas even more diverse products are prospected to be available from future biorefineries. Developing new applications for lignin is hence paramount - both from a technological and economic point of view. This review article is therefore summarizing and discussing the current research-state of functional surfaces, films, and coatings with lignin, where emphasis is put on the formulation and application of such solutions. 

  • 23.
    Trey, Stacy
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Hållbar Samhällsbyggnad.
    Olsson, Richard Tobias
    KTH Royal Institute of Technology, Sweden.
    Ström, Valter
    KTH Royal Institute of Technology, Sweden.
    Berglund, Lars
    KTH Royal Institute of Technology, Sweden.
    Johansson, Mats K.G.
    KTH Royal Institute of Technology, Sweden.
    Controlled deposition of magnetic particles within the 3-D template of wood: Making use of the natural hierarchical structure of wood2014Inngår i: RSC Advances, E-ISSN 2046-2069, Vol. 4, nr 67, s. 35678-35685Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This study presents a promising method to make three-dimensional lattices of structured nanomaterials by using wood templates for in situ (confined) directed growth of inorganic material in the ordered cell walls. The wood was impregnated by transition metal ion precursors (iron, manganese and cobalt) at 5 bars pressure that were further transformed into magnetic particles (Fe 3O4, MnFe2O4 and CoFe 2O4) by addition of alkaline solutions. It was found that by this method, it was possible to produce lightweight ferromagnetic functionalized wood materials in an inexpensive and environmentally friendly way. It was possible to functionalise the wood throughout the structure with a high weight percent of particles from 15-20 wt% as observed by TGA. These were not only adsorbed to the surface of the lumen, but also found by SEM-EDX throughout the cell wall and middle lamella and in higher amounts in early wood. The magnetic properties were nearly unaffected by the incorporation into the wood samples as compared to powder compacts obtained as particles that precipitated separately in the impregnation solution, both for soft and hard magnetic materials. Whereas the hard magnetic phase CoFe2O 4 showed insignificant leaching, the soft magnetic Fe 3O4, MnFe2O4 lost around 50 wt% during repeated washing in deionized water, suggesting that the CoFe 2O4 particles were more readily attached in the structure of the wood. The crystal structure of the magnetic particles was determined to be the same in the wood structure as those formed in solution.

  • 24.
    Wu, G
    et al.
    Ludong University, China; Umeå University, Sweden.
    Alriksson, Björn
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Bioraffinaderi och energi.
    Jönsson, Leif
    Umeå University, Sweden.
    Conditioning of pretreated birch by liquid-liquid organic extractions to improve yeast fermentability and enzymatic digestibility2023Inngår i: RSC Advances, E-ISSN 2046-2069, Vol. 13, nr 29, s. 20023-20030Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    By-products from hydrothermal pretreatment of lignocellulosic biomass inhibit enzymatic saccharification and microbial fermentation. Three long-chain organic extractants (Alamine 336, Aliquat 336 and Cyanex 921) were compared to two conventional organic solvents (ethyl acetate and xylene) with regard to conditioning of birch wood pretreatment liquid (BWPL) for improved fermentation and saccharification. In the fermentation experiments, extraction with Cyanex 921 resulted in the best ethanol yield, 0.34 ± 0.02 g g−1 on initial fermentable sugars. Extraction with xylene also resulted in a relatively high yield, 0.29 ± 0.02 g g−1, while cultures consisting of untreated BWPL and BWPL treated with the other extractants exhibited no ethanol formation. Aliquat 336 was most efficient with regard to removing by-products, but the residual Aliquat after the extraction was toxic to yeast cells. Enzymatic digestibility increased by 19-33% after extraction with the long-chain organic extractants. The investigation demonstrates that conditioning with long-chain organic extractants has the potential to relieve inhibition of both enzymes and microbes. 

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