000874162 001__ 874162 000874162 005__ 20240610115420.0 000874162 0247_ $$2doi$$a10.1002/marc.201900422 000874162 0247_ $$2ISSN$$a0173-2803 000874162 0247_ $$2ISSN$$a1022-1336 000874162 0247_ $$2ISSN$$a1521-3927 000874162 0247_ $$2Handle$$a2128/24660 000874162 0247_ $$2pmid$$apmid:31736176 000874162 0247_ $$2WOS$$aWOS:000496821400001 000874162 037__ $$aFZJ-2020-01262 000874162 082__ $$a540 000874162 1001_ $$0P:(DE-HGF)0$$aWypysek, Sarah K.$$b0 000874162 245__ $$aTailoring the Cavity of Hollow Polyelectrolyte Microgels 000874162 260__ $$aWeinheim$$bWiley-VCH$$c2020 000874162 3367_ $$2DRIVER$$aarticle 000874162 3367_ $$2DataCite$$aOutput Types/Journal article 000874162 3367_ $$0PUB:(DE-HGF)16$$2PUB:(DE-HGF)$$aJournal Article$$bjournal$$mjournal$$s1586244492_13716 000874162 3367_ $$2BibTeX$$aARTICLE 000874162 3367_ $$2ORCID$$aJOURNAL_ARTICLE 000874162 3367_ $$00$$2EndNote$$aJournal Article 000874162 520__ $$aThe 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. 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