Contrast variation SANS measurement of shell monomer density profiles of smart core-shell microgels.

Cors M, Wiehemeier L, Wrede O, Feoktystov A, Cousin F, Hellweg T, Oberdisse J (2020)
Soft matter.

Zeitschriftenaufsatz | E-Veröff. vor dem Druck | Englisch
 
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Autor*in
Cors, MarianUniBi; Wiehemeier, LarsUniBi; Wrede, Oliver; Feoktystov, Artem; Cousin, Fabrice; Hellweg, Thomas; Oberdisse, Julian
Abstract / Bemerkung
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.
Erscheinungsjahr
2020
Zeitschriftentitel
Soft matter
eISSN
1744-6848
Page URI
https://pub.uni-bielefeld.de/record/2941088

Zitieren

Cors M, Wiehemeier L, Wrede O, et al. Contrast variation SANS measurement of shell monomer density profiles of smart core-shell microgels. Soft matter. 2020.
Cors, M., Wiehemeier, L., Wrede, O., Feoktystov, A., Cousin, F., Hellweg, T., & Oberdisse, J. (2020). Contrast variation SANS measurement of shell monomer density profiles of smart core-shell microgels. Soft matter. doi:10.1039/c9sm02036e
Cors, M., Wiehemeier, L., Wrede, O., Feoktystov, A., Cousin, F., Hellweg, T., and Oberdisse, J. (2020). Contrast variation SANS measurement of shell monomer density profiles of smart core-shell microgels. Soft matter.
Cors, M., et al., 2020. Contrast variation SANS measurement of shell monomer density profiles of smart core-shell microgels. Soft matter.
M. Cors, et al., “Contrast variation SANS measurement of shell monomer density profiles of smart core-shell microgels.”, Soft matter, 2020.
Cors, M., Wiehemeier, L., Wrede, O., Feoktystov, A., Cousin, F., Hellweg, T., Oberdisse, J.: Contrast variation SANS measurement of shell monomer density profiles of smart core-shell microgels. Soft matter. (2020).
Cors, Marian, Wiehemeier, Lars, Wrede, Oliver, Feoktystov, Artem, Cousin, Fabrice, Hellweg, Thomas, and Oberdisse, Julian. “Contrast variation SANS measurement of shell monomer density profiles of smart core-shell microgels.”. Soft matter (2020).

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