This title appears in the Scientific Report :
2014
Please use the identifier:
http://hdl.handle.net/2128/18339 in citations.
Please use the identifier: http://dx.doi.org/10.1515/zpch-2014-0559 in citations.
Comparison of the Microstructure of Stimuli Responsive Zwitterionic PNIPAM-co-Sulfobetaine Microgels with PNIPAM Microgels and Classical Hard-Sphere Systems
Comparison of the Microstructure of Stimuli Responsive Zwitterionic PNIPAM-co-Sulfobetaine Microgels with PNIPAM Microgels and Classical Hard-Sphere Systems
In this study, we compare the experimental static structure factors of concentrated solutions of amphoteric poly(N-isopropylacrylamide) (PNIPAM) microgels with those of the polydisperse hard-sphere model. We use zwitterionic microgels as model systems for amphoteric microgels with an equal amount of...
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Personal Name(s): | Schmid, Andreas Josef |
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Riest, Jonas / Eckert, Thomas / Lindner, Peter / Naegele, Gerhard / Richtering, Walter (Corresponding Author) | |
Contributing Institute: |
Weiche Materie; ICS-3 |
Published in: | Zeitschrift für physikalische Chemie, 228 (2014) ISSN (Online) 2196-7156, ISSN (Print) 0942-9352, S. 1033-1052 |
Imprint: |
Berlin
De @Gruyter
2014
|
DOI: |
10.1515/zpch-2014-0559 |
Document Type: |
Journal Article |
Research Program: |
Soft Matter Composites |
Link: |
OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.1515/zpch-2014-0559 in citations.
In this study, we compare the experimental static structure factors of concentrated solutions of amphoteric poly(N-isopropylacrylamide) (PNIPAM) microgels with those of the polydisperse hard-sphere model. We use zwitterionic microgels as model systems for amphoteric microgels with an equal amount of positive and negative charges located in a defined distance. Using small angle neutron scattering (SANS), we measure the static structure factors, SM(q), of a series of zwitterionic microgels with increasing amount of zwitterion, including a reference sample of pure PNIPAM. The experimental SM(q) is compared with predictions based on the Percus-Yevick approximation for hard spheres. We also compare with the PNIPAM reference sample measured for zwitterionic microgels. We find no significant influence of the zwitterionic comonomer on the effective pair potential. The PNIPAM and the zwitterionic microgels can be described by the hard-sphere model for smaller volume fractions ϕT ≲ 0.4 only. |