Coupling of Rotational Motion with Shape Fluctuations of Core-shell Microgels Having Tunable Softness

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dc.creatorBolisetty, S.
dc.creatorHoffmann, M.
dc.creatorLekkala, S.
dc.creatorHellweg, Th.
dc.creatorBallauff, M.
dc.creatorHarnau, L.
dc.date2009-02-19
dc.date.accessioned2026-07-07T12:44:10Z
dc.date.available2026-07-07T12:44:10Z
dc.descriptionThe influence of shape fluctuations on deformable thermosensitive microgels in aqueous solution is investigated by dynamic light scattering (DLS) and depolarized dynamic light scattering (DDLS). The systems under study consist of a solid core of polystyrene and a thermosensitive shell of cross-linked poly(N-isopropylacrylamide) (PNIPA) without and with embedded palladium nanoparticles. PNIPA is soluble in water, but has a lower critical solution temperature at 32 C (LCST). Below the LCST the PNIPA shell is swollen. Here we find that besides translational and rotational diffusion, the particles exhibit additional dynamics resulting from shape fluctuations. This leads to a pronounced apparent increase of the rotational diffusion coefficient. Above the transition temperature the shell collapses and provides a rather tight envelope of the core. In this state the dynamics of the shell is frozen and the core-shell particles behave like hard spheres. A simple physical model is presented to capture and explain the essentials of the coupling of rotational motion and shape fluctuations.
dc.description9 pages, 7 figures
dc.identifierhttps://arxiv.org/abs/0902.3359
dc.identifierhttp://arxiv.org/abs/0902.3359
dc.identifierMacromolecules 42, 1264 (2009)
dc.identifierdoi:10.1021/ma8022603
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/220677
dc.subjectSoft Condensed Matter
dc.subjectStatistical Mechanics
dc.titleCoupling of Rotational Motion with Shape Fluctuations of Core-shell Microgels Having Tunable Softness
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