Tailoring the Cavity of Hollow Polyelectrolyte Microgels
Wypysek, Sarah K.
Scotti, Andrea (Corresponding author) / Alziyadi, Mohammed O. / Potemkin, Grigory / Denton, Alan R. / Richtering, Walter (Corresponding author)
Elektronische Materialien; PGI-7
Heinz Maier-Leibnitz Zentrum; MLZ
JCNS-FRM-II; JCNS-FRM-II
Theorie der Weichen Materie und Biophysik; ICS-2
International Helmholtz Research School of Biophysics and Soft Matter; IHRS-BioSoft
Macromolecular rapid communications, 41 (2020) 1, S. 1900422 -
Weinheim Wiley-VCH 2020
10.1002/marc.201900422
Journal Article
International Helmholtz Research School of Biophysics and Soft Matter
Jülich Centre for Neutron Research (JCNS)
FRM II / MLZ
ohne Topic
OpenAccess
OpenAccess
Please use the identifier: http://hdl.handle.net/2128/24660 in citations.
Please use the identifier: http://dx.doi.org/10.1002/marc.201900422 in citations.
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520 |a The authors demonstrate how the size and structure of the cavity of hollow charged microgels may be controlled by varying pH and ionic strength. Hollow charged microgels based on N‐isopropylacrylamide with ionizable co‐monomers (itaconic acid) combine advanced structure with enhanced responsiveness to external stimuli. Structural advantages accrue from the increased surface area provided by the extra internal surface. Extreme sensitivity to pH and ionic strength due to ionizable moieties in the polymer network differentiates these soft colloidal particles from their uncharged counterparts, which sustain a hollow structure only at cross‐link densities sufficiently high that stimuli sensitivity is reduced. Using small‐angle neutron and light scattering, increased swelling of the network in the charged state accompanied by an expanded internal cavity is observed. Upon addition of salt, the external fuzziness of the microgel surface diminishes while the internal fuzziness grows. These structural changes are interpreted via Poisson–Boltzmann theory in the cell model. 
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