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@ARTICLE{Cors:873380,
author = {Cors, Marian and Wiehemeier, Lars and Wrede, Oliver and
Feoktystov, Artem and Cousin, Fabrice and Hellweg, Thomas
and Oberdisse, Julian},
title = {{C}ontrast variation {SANS} measurement of shell monomer
density profiles of smart core–shell microgels},
journal = {Soft matter},
volume = {16},
number = {7},
issn = {1744-6848},
address = {London},
publisher = {Royal Soc. of Chemistry},
reportid = {FZJ-2020-00692},
pages = {1922-1930},
year = {2020},
abstract = {The 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.},
cin = {JCNS-FRM-II / JCNS-2 / MLZ},
ddc = {530},
cid = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
I:(DE-Juel1)JCNS-2-20110106 / I:(DE-588b)4597118-3},
pnm = {6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623)
/ 6G15 - FRM II / MLZ (POF3-6G15)},
pid = {G:(DE-HGF)POF3-6G4 / G:(DE-HGF)POF3-6G15},
experiment = {EXP:(DE-MLZ)KWS1-20140101},
typ = {PUB:(DE-HGF)16},
pubmed = {pmid:31995091},
UT = {WOS:000527137300020},
doi = {10.1039/C9SM02036E},
url = {https://juser.fz-juelich.de/record/873380},
}