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 16(7): 1922-1930.

Zeitschriftenaufsatz | Veröffentlicht | Englisch
 
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Autor*in
Cors, MarianUniBi; Wiehemeier, LarsUniBi; Wrede, OliverUniBi; Feoktystov, Artem; Cousin, Fabrice; Hellweg, ThomasUniBi ; 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
Band
16
Ausgabe
7
Seite(n)
1922-1930
ISSN
1744-683x
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;16(7):1922-1930.
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, 16(7), 1922-1930. 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 16, 1922-1930.
Cors, M., et al., 2020. Contrast variation SANS measurement of shell monomer density profiles of smart core-shell microgels. Soft matter, 16(7), p 1922-1930.
M. Cors, et al., “Contrast variation SANS measurement of shell monomer density profiles of smart core-shell microgels.”, Soft matter, vol. 16, 2020, pp. 1922-1930.
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. 16, 1922-1930 (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 16.7 (2020): 1922-1930.

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