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| 001 | 843966 | ||
| 005 | 20240610121148.0 | ||
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| 100 | 1 | _ | |a Keidel, Rico |0 0000-0002-7802-9407 |b 0 |e Corresponding author |
| 245 | _ | _ | |a Time-resolved structural evolution during the collapse of responsive hydrogels: The microgel-to-particle transition |
| 260 | _ | _ | |a Washington, DC [u.a.] |c 2018 |b Assoc. |
| 336 | 7 | _ | |a article |2 DRIVER |
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| 520 | _ | _ | |a 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. |
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| 700 | 1 | _ | |a Ghavami, Ali |0 P:(DE-Juel1)164360 |b 1 |
| 700 | 1 | _ | |a Lugo, Dersy M. |0 0000-0002-7539-3916 |b 2 |
| 700 | 1 | _ | |a Lotze, Gudrun |0 0000-0001-7995-2693 |b 3 |
| 700 | 1 | _ | |a Virtanen, Otto |0 P:(DE-HGF)0 |b 4 |
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| 700 | 1 | _ | |a Pedersen, Jan Skov |0 0000-0002-7768-0206 |b 6 |
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| 700 | 1 | _ | |a Winkler, Roland G. |0 P:(DE-Juel1)131039 |b 8 |e Corresponding author |
| 700 | 1 | _ | |a Richtering, Walter |0 P:(DE-Juel1)IHRS-BioSoft-140012 |b 9 |e Corresponding author |
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