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- W3105703457 abstract "The crystallization of proteins or colloids is often hindered by the appearance of aggregates of low fractal dimension called gels. Here we study the effect of electrostatics upon crystal and gel formation using an analytic model of hard spheres bearing point charges and short range attractive interactions. We find that the chief electrostatic free energy cost of forming assemblies comes from the entropic loss of counterions that render assemblies charge-neutral. Because there exists more accessible volume for these counterions around an open gel than a dense crystal, there exists an electrostatic entropic driving force favoring the gel over the crystal. This driving force increases with increasing sphere charge, but can be counteracted by increasing counterion concentration. We show that these effects cannot be fully captured by pairwise-additive macroion interactions of the kind often used in simulations, and we show where on the phase diagram to go in order to suppress gel formation." @default.
- W3105703457 created "2020-11-23" @default.
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- W3105703457 date "2011-08-25" @default.
- W3105703457 modified "2023-09-23" @default.
- W3105703457 title "Electrostatics and aggregation: How charge can turn a crystal into a gel" @default.
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- W3105703457 doi "https://doi.org/10.1063/1.3626803" @default.
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