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Super-porous nanocomposite PNIPAm hydrogels reinforced with titania nanoparticles, displaying a very fast temperature response as well as pH-sensitivity
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SYSNO ASEP 0435585 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Super-porous nanocomposite PNIPAm hydrogels reinforced with titania nanoparticles, displaying a very fast temperature response as well as pH-sensitivity Author(s) Huerta-Angeles, Gloria (UMCH-V) RID, ORCID
Hishchak, Khrystyna (UMCH-V)
Strachota, Adam (UMCH-V) RID, ORCID
Strachota, Beata (UMCH-V) RID
Šlouf, Miroslav (UMCH-V) RID, ORCID
Matějka, Libor (UMCH-V) RIDSource Title European Polymer Journal. - : Elsevier - ISSN 0014-3057
Roč. 59, October (2014), s. 341-352Number of pages 12 s. Language eng - English Country GB - United Kingdom Keywords PNIPAm hydrogel ; super-porous ; cryogel Subject RIV JI - Composite Materials R&D Projects GAP107/12/2445 GA ČR - Czech Science Foundation (CSF) Institutional support UMCH-V - RVO:61389013 UT WOS 000343341100037 DOI 10.1016/j.eurpolymj.2014.07.033 Annotation Super-porous nanocomposite hydrogels, based on PNIPAm matrix and reinforced by acid- and base-resistant TiO2 nanoparticles were prepared via freezing polymerization. The hydrogels display a fast swelling response to temperature (potential application as mechanical actuators), which is enabled by the nano-reinforcement. The reinforcing effect of TiO2 was strongly enhanced (by nearly one order) through the incorporation of small amounts (2.5 mol%) of sodium methacrylate (SMA) as comonomer, which strongly adsorbs on the TiO2 particles’ surface, in analogy to ionic double layer adsorption of salts on free TiO2 colloid particles. The SMA adsorption is so strong, that the pH-responsivity of the swelling of the PNIPAm-SMA copolymer is practically suppressed. A significant pH-responsivity was found only in such poly(NIPAm-co-SMA)/TiO2 gels, which contained high amounts of chemical crosslinker. In these rather rigid gels, some of the SMA units were topologically prevented from adsorption to TiO2 surface. Workplace Institute of Macromolecular Chemistry Contact Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Year of Publishing 2015
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