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000873380 245__ $$aContrast variation SANS measurement of shell monomer density profiles of smart core–shell microgels
000873380 260__ $$aLondon$$bRoyal Soc. of Chemistry$$c2020
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000873380 520__ $$aThe radial density profile of deuterated poly(N,n-propyl acrylamide) shell monomers within core–shell microgels has been studied by small-angle neutron scattering in order to shed light on the origin of their linear thermally-induced swelling. The poly(N-isopropyl methacrylamide) core monomers have been contrast-matched by the H2O/D2O solvent mixture, and the intensity thus provides a direct measurement of the spatial distribution of the shell monomers. Straightforward modelling shows that their structure does not correspond to the expected picture of a well-defined external shell. A multi-shell model solved by a reverse Monte Carlo approach is then applied to extract the monomer density as a function of temperature and of the core crosslinking. It is found that most shell monomers fill the core at high temperatures approaching synthesis conditions of collapsed particles, forming only a dilute corona. As the core monomers tend to swell at lower temperatures, a skeleton of insoluble shell monomers hinders swelling, inducing the progressive linear thermoresponse.
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000873380 65017 $$0V:(DE-MLZ)GC-1602-2016$$2V:(DE-HGF)$$aPolymers, Soft Nano Particles and  Proteins$$x0
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000873380 7001_ $$00000-0002-8827-6807$$aWiehemeier, Lars$$b1
000873380 7001_ $$00000-0002-0020-1334$$aWrede, Oliver$$b2
000873380 7001_ $$0P:(DE-Juel1)144382$$aFeoktystov, Artem$$b3
000873380 7001_ $$00000-0001-7523-5160$$aCousin, Fabrice$$b4
000873380 7001_ $$00000-0002-2394-5846$$aHellweg, Thomas$$b5$$eCorresponding author
000873380 7001_ $$00000-0002-9510-1722$$aOberdisse, Julian$$b6$$eCorresponding author
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