recid:326792 - Search Results

Crystal structure of highly concentrated, ionic microgel suspensions studied by neutron scattering

Gasser, Urs ; Sierra-Martin, B. ; Fernandez-Nieves, A.

In: Physical Review, 2009, vol. 79, no. 5, p. 051403

We present a neutron-scattering investigation of the crystal structure formed by pH-sensitive poly(2-vinylpyridine) microgel particles with 5 wt % of cross-linker. We focus on highly swollen particles and explore concentrations ranging from below close packing to well above close packing, where the particles are forced to shrink and/or interpenetrate. The crystal structure is found to be random...

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Temperature-sensitive poly(N-Isopropyl-Acrylamide) microgel particles: A light scattering study

Reufer, Mathias ; Díaz-Leyva, Pedro ; Lynch, I. ; Scheffold, Frank

In: European Physical Journal E, 2009, vol. 28, no. 2, p. 165-171

We present a light scattering study of aqueous suspensions of microgel particles consisting of poly(N-Isopropyl-Acrylamide) cross-linked gels. The solvent quality for the particles depends on temperature and thus allows tuning of the particle size. The particle synthesis parameters are chosen such that the resulting high surface charge of the particles prevents aggregation even in the...

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