Time-resolved structural evolution during the collapse of responsive hydrogels: The microgel-to-particle transition
dc.bibliographicCitation.firstPage | eaao7086 | |
dc.bibliographicCitation.issue | 4 | |
dc.bibliographicCitation.journalTitle | Science Advances | eng |
dc.bibliographicCitation.volume | 4 | |
dc.contributor.author | Keidel, Rico | |
dc.contributor.author | Ghavami, Ali | |
dc.contributor.author | Lugo, Dersy M. | |
dc.contributor.author | Lotze, Gudrun | |
dc.contributor.author | Virtanen, Otto | |
dc.contributor.author | Beumers, Peter | |
dc.contributor.author | Pedersen, Jan Skov | |
dc.contributor.author | Bardow, Andre | |
dc.contributor.author | Winkler, Roland G. | |
dc.contributor.author | Richtering, Walter | |
dc.date.accessioned | 2023-03-27T11:12:04Z | |
dc.date.available | 2023-03-27T11:12:04Z | |
dc.date.issued | 2018 | |
dc.description.abstract | Adaptive hydrogels, often termed smart materials, are macromolecules whose structure adjusts to external stimuli. Responsive micro- and nanogels are particularly interesting because the small length scale enables very fast response times. Chemical cross-links provide topological constraints and define the three-dimensional structure of the microgels, whereas their porous structure permits fast mass transfer, enabling very rapid structural adaption of the microgel to the environment. The change of microgel structure involves a unique transition from a flexible, swollen finite-size macromolecular network, characterized by a fuzzy surface, to a colloidal particle with homogeneous density and a sharp surface. In this contribution, we determine, for the first time, the structural evolution during the microgel-to-particle transition. Time-resolved small-angle x-ray scattering experiments and computer simulations unambiguously reveal a two-stage process: In a first, very fast process, collapsed clusters form at the periphery, leading to an intermediate, hollowish core-shell structure that slowly transforms to a globule. This structural evolution is independent of the type of stimulus and thus applies to instantaneous transitions as in a temperature jump or to slower stimuli that rely on the uptake of active molecules from and/or exchange with the environment. The fast transitions of size and shape provide unique opportunities for various applications as, for example, in uptake and release, catalysis, or sensing. | eng |
dc.description.version | publishedVersion | eng |
dc.identifier.uri | https://oa.tib.eu/renate/handle/123456789/11772 | |
dc.identifier.uri | http://dx.doi.org/10.34657/10806 | |
dc.language.iso | eng | |
dc.publisher | Washington, DC [u.a.] : Assoc. | |
dc.relation.doi | https://doi.org/10.1126/sciadv.aao7086 | |
dc.relation.essn | 2375-2548 | |
dc.rights.license | CC BY 4.0 Unported | |
dc.rights.uri | https://creativecommons.org/licenses/by/4.0 | |
dc.subject.ddc | 500 | |
dc.subject.ddc | 540 | |
dc.subject.ddc | 530 | |
dc.subject.other | Hydrogels | eng |
dc.subject.other | Macromolecules | eng |
dc.subject.other | Mass transfer | eng |
dc.subject.other | X ray scattering | eng |
dc.subject.other | Core shell structure | eng |
dc.title | Time-resolved structural evolution during the collapse of responsive hydrogels: The microgel-to-particle transition | eng |
dc.type | Article | eng |
dc.type | Text | eng |
tib.accessRights | openAccess | |
wgl.contributor | DWI | |
wgl.subject | Chemie | ger |
wgl.subject | Physik | ger |
wgl.type | Zeitschriftenartikel | ger |
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