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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Hietala, Sami
University of Helsinki
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (19/19 displayed)
- 2025Amorphous solid dispersions of amphiphilic polymer excipients and indomethacin prepared by hot melt extrusioncitations
- 2024Amorphous solid dispersions of amphiphilic polymer excipients and indomethacin prepared by hot melt extrusioncitations
- 2024Area-Selective Etching of Poly(lactic acid) Films via Catalytic Hydrogenolysis and Crackingcitations
- 2023Fabrication of hydrogel microspheres via microfluidics using inverse electron demand Diels-Alder click chemistry-based tetrazine-norbornene for drug delivery and cell encapsulation applicationscitations
- 2021Mild alkaline separation of fiber bundles from eucalyptus bark and their composites with cellulose acetate butyratecitations
- 2021Air oxidized activated carbon catalyst for aerobic oxidative aromatizations of N-heterocyclescitations
- 2020Methyl cellulose/cellulose nanocrystal nanocomposite fibers with high ductilitycitations
- 2017One-step carbon nanotubes grafting with styrene-co-acrylonitrile by reactive melt blending for electrospinning of conductive reinforced composite membranescitations
- 2017Titanium alkylphosphate functionalised mesoporous silica for enhanced uptake of rare-earth ionscitations
- 2016Rheological properties of thermoresponsive nanocomposite hydrogelscitations
- 2015Water-Resistant, Transparent Hybrid Nanopaper by Physical Cross-Linking with Chitosancitations
- 2015Carbocatalysed Oxidative C-sp2-C-sp2 Homocouplings of Benzo-Fused Heterocyclescitations
- 2015Carbocatalysed Oxidative C sp 2 -C sp 2 Homocouplings of Benzo-Fused Heterocyclescitations
- 2013Chemistry and water-repelling properties of phenyl-incorporating wood compositescitations
- 2013Thermoresponsiveness of PDMAEMA. Electrostatic and stereochemical effectscitations
- 2012Crystal morphology modification by the addition of tailor-made stereocontrolled poly(N-isopropyl acrylamide)citations
- 2009Rheological properties of associative star polymers in aqueous solutionscitations
- 2009Rheological Properties of Associative Star Polymers in Aqueous Solutions: Effect of Hydrophobe Length and Polymer Topologycitations
- 2009Association behavior and properties of copolymers of perfluorooctyl ethyl methacrylate and eicosanyl methacrylatecitations
Places of action
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article
Rheological properties of thermoresponsive nanocomposite hydrogels
Abstract
<p>Highly elastic and robust nanocomposite hydrogels based on N-isopropylacrylamide (NIPAM) and cationic (3-acrylamidopropyl) trimethylammonium chloride (AMPTMA) were synthesized by photopolymerization. Nanoscopic clay, laponite XLS, was added in the gels during the synthesis. The effect of a hydrophobic salt, lithium bis(trifluoromethane) sulfonimide (LiNTf2), and clay content on the viscoelastic properties, swelling ratio, and stiffness of the nanocomposite hydrogels were investigated as a function of temperature. Synthetic clay served as a multifunctional cross-linker, producing hydrogels with enhanced elastic properties. Anionic NTf2 binds to the cationic comonomer units and significantly affected the viscoelasticity and thermal properties. DSC measurements showed that the volume phase transition temperature and its enthalpy changed with the clay content and with introducing the cationic comonomer (AMPTMA) in the PNIPAM network. With the addition of either laponite XLS or the comonomer and 5 mM solution of LiNTf2, a fourfold and fivefold increase in elastic modulus was obtained, respectively, compared to that of the homopolymer PNIPAM hydrogel. With increasing the temperature from 20 to 45 degrees C for the copolymer gel with 10% AMPTMA in 5 mM LiNTf2, the elastic modulus grew 15 times larger. (c) 2015 Wiley Periodicals, Inc.</p>