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- W2066417327 abstract "The equilibrium phase behavior and the dynamics of colloidal assemblies composed of soft, spherical, colloidal particles with attractive pair potentials have been studied by digital video microscopy. The particles were synthesized by precipitation copolymerization of N-isopropylacrylamide (NIPAm), acrylic acid (AAc), and N,N‘-methylene bis(acrylamide) (BIS), yielding highly water swollen hydrogel microparticles (microgels) with temperature- and pH-tunable swelling properties. It is observed that in a pH = 3.0 buffer with an ionic strength of 10 mM, assemblies of pNIPAm−AAc microgels crystallize due to a delicate balance between weak attractive and soft repulsive forces. The attractive interactions are further confirmed by measurements of the crystal melting temperatures. As the temperature of colloidal crystals is increased, the crystalline phase does not melt until the temperature is far above the lower critical solution temperature (LCST) of the microgels, in stark contrast to what is typically observed for phases formed due to purely repulsive interactions. The unusual thermal stability of pNIPAm−AAc colloidal crystals demonstrates an enthalpic origin of crystallization for these microgels." @default.
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- W2066417327 date "2007-05-31" @default.
- W2066417327 modified "2023-09-25" @default.
- W2066417327 title "Crystallization Behavior of Soft, Attractive Microgels" @default.
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- W2066417327 doi "https://doi.org/10.1021/jp073122n" @default.
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