About: Super-porous nanocomposite PNIPAm hydrogels reinforced with titania nanoparticles, displaying a very fast temperature response as well as pH-sensitivity

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About: Super-porous nanocomposite PNIPAm hydrogels reinforced with titania nanoparticles, displaying a very fast temperature response as well as pH-sensitivity Goto Sponge NotDistinct Permalink

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	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. 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. (en)
Title	Super-porous nanocomposite PNIPAm hydrogels reinforced with titania nanoparticles, displaying a very fast temperature response as well as pH-sensitivity Super-porous nanocomposite PNIPAm hydrogels reinforced with titania nanoparticles, displaying a very fast temperature response as well as pH-sensitivity (en)
skos:prefLabel	Super-porous nanocomposite PNIPAm hydrogels reinforced with titania nanoparticles, displaying a very fast temperature response as well as pH-sensitivity Super-porous nanocomposite PNIPAm hydrogels reinforced with titania nanoparticles, displaying a very fast temperature response as well as pH-sensitivity (en)
skos:notation	RIV/61389013:_____/14:00435585!RIV15-GA0-61389013
http://linked.open...avai/riv/aktivita	I P
http://linked.open...avai/riv/aktivity	I, P(GAP107/12/2445)
http://linked.open...iv/cisloPeriodika	October
http://linked.open...vai/riv/dodaniDat	2015
http://linked.open...aciTvurceVysledku	Matějka, Libor Šlouf, Miroslav Strachota, Adam Strachota, Beata Huerta-Angeles, Gloria Hishchak, Khrystyna
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Ústav makromolekulární chemie AV ČR, v. v. i.
http://linked.open...dnocenehoVysledku	48567
http://linked.open...ai/riv/idVysledku	RIV/61389013:_____/14:00435585
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	PNIPAm hydrogel; super-porous; cryogel (en)
http://linked.open.../riv/klicoveSlovo	cryogel PNIPAm hydrogel super-porous
http://linked.open...odStatuVydavatele	GB - Spojené království Velké Británie a Severního Irska
http://linked.open...ontrolniKodProRIV	[78294AFBA0D1]
http://linked.open...i/riv/nazevZdroje	European Polymer Journal
http://linked.open...in/vavai/riv/obor	JI
http://linked.open...ichTvurcuVysledku	6 (xsd:int)
http://linked.open...cetTvurcuVysledku	6 (xsd:int)
http://linked.open...vavai/riv/projekt	SiOC ceramic foam from pyrolyzed polymer precursor as a core of thermally stable composite sandwich structures
http://linked.open...UplatneniVysledku	2014
http://linked.open...v/svazekPeriodika	59
http://linked.open...iv/tvurceVysledku	Matějka, Libor Šlouf, Miroslav Strachota, Adam Huerta-Angeles, Gloria Strachota, Beata Hishchak, Khrystyna
http://linked.open...ain/vavai/riv/wos	000343341100037
issn	0014-3057
number of pages	12 (xsd:int)
http://bibframe.org/vocab/doi	10.1016/j.eurpolymj.2014.07.033

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