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  • 1.
    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 nanoneedles2019In: RSC Advances, ISSN 2046-2069, E-ISSN 2046-2069, Vol. 9, no 25, p. 14443-14451Article in journal (Refereed)
    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.

  • 2. Bodvik, Rasmus
    et al.
    Thormann, Esben
    Karlsson, Leif
    Claesson, Per M
    YKI – Ytkemiska institutet.
    Temperature-dependent adsorption of cellulose ethers on silica and hydrophobized silica immersed in aqueous polymer solution2011In: RSC Advances, ISSN 2046-2069, E-ISSN 2046-2069, Vol. 1, no 2, p. 305-314Article in journal (Refereed)
    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.

  • 3.
    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 periodate2015In: RSC Advances, ISSN 2046-2069, E-ISSN 2046-2069, Vol. 5, no 117, p. 96927-Article in journal (Refereed)
    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.

  • 4.
    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 periodate2015In: RSC Advances, ISSN 2046-2069, E-ISSN 2046-2069, Vol. 5, no 104, p. 85889-85897Article in journal (Refereed)
    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.

  • 5. Hua, K.
    et al.
    Carlsson, D.O.
    Ålander, E.
    RISE, Innventia.
    Lindström, T.
    RISE, Innventia.
    Strömme, M.
    Mihranyan, A.
    Ferraz, N.
    Translational study between structure and biological response of nanocellulose from wood and green algae2014In: RSC Advances, ISSN 2046-2069, E-ISSN 2046-2069, Vol. 4, no 6, p. 2892-2903Article in journal (Refereed)
  • 6.
    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 surface2014In: RSC Advances, ISSN 2046-2069, E-ISSN 2046-2069, Vol. 4, no 106, p. 61863-61868Article in journal (Refereed)
    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.

  • 7.
    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 demonstrated2014In: RSC Advances, ISSN 2046-2069, E-ISSN 2046-2069, Vol. 4, no 18, p. 9048-9055Article in journal (Refereed)
    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.

  • 8.
    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 level2015In: RSC Advances, ISSN 2046-2069, E-ISSN 2046-2069, Vol. 5, no 71, p. 58091-58099Article in journal (Refereed)
    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.

  • 9.
    Junker, K.
    et al.
    ETH Zürich, Switzerland.
    Zandomeneghi, G.
    ETH Zürich, Switzerland.
    Guo, Zengwei
    RISE - Research Institutes of Sweden, Materials and Production, IVF.
    Kissner, R.
    ETH Zürich, Switzerland.
    Ishikawa, T.
    Paul Scherrer Institute, Switzerland.
    Kohlbrecher, J.
    ETH Zürich, Switzerland; Paul Scherrer Institute, Switzerland.
    Walde, P.
    ETH Zürich, Switzerland.
    Mechanistic aspects of the horseradish peroxidase-catalysed polymerisation of aniline in the presence of AOT vesicles as templates2012In: RSC Advances, ISSN 2046-2069, E-ISSN 2046-2069, Vol. 2, no 16, p. 6478-6495Article in journal (Refereed)
    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. © 2012 The Royal Society of Chemistry.

  • 10. Kuktaite, R.
    et al.
    Plivelic, T.S.
    Ture, H.
    Hedenqvist, M.S.
    Gällstedt, M.
    RISE, Innventia.
    Marttila, S.
    Johansson, E.
    Changes in the hierarchical protein polymer structure: Urea and temperature effects on wheat gluten films2012In: RSC Advances, ISSN 2046-2069, E-ISSN 2046-2069, no 31, p. 11908-11914Article in journal (Refereed)
  • 11.
    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 studies2016In: RSC Advances, ISSN 2046-2069, E-ISSN 2046-2069, Vol. 6, no 23, p. 19111-19127Article in journal (Refereed)
    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.

  • 12.
    Mille, Christian B
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor.
    Tyrode, EC
    Corkery, Robert W
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor.
    3D titania photonic crystals replicated from gyroid structures in butterfly wing scales: Approaching full band gaps at visible wavelengths2013In: RSC Advances, ISSN 2046-2069, E-ISSN 2046-2069, Vol. 3, no 9, p. 3109-3117Article in journal (Refereed)
    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.

  • 13.
    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 properties2015In: RSC Advances, ISSN 2046-2069, E-ISSN 2046-2069, Vol. 5, no 41, p. 32217-32226Article in journal (Refereed)
    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.

  • 14. 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 organization2014In: RSC Advances, ISSN 2046-2069, E-ISSN 2046-2069, no 4, p. 2051-2060Article in journal (Refereed)
  • 15.
    Trey, Stacy
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Hållbar Samhällsbyggnad.
    Controlled deposition of magnetic particles within the 3-D template of wood: Making use of the natural hierarchical structure of wood2014In: RSC Advances, ISSN 2046-2069, E-ISSN 2046-2069, Vol. 4, no 67, p. 35678-35685Article in journal (Refereed)
1 - 15 of 15
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