Microscopic observation of ordered colloids in sedimentation equilibrium and the important role of Debye screening length. 3. Heavy and monodisperse polystyrene type spheres in aqueous solution of neutral polymers |
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Authors: | T. Okubo |
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Affiliation: | (1) Present address: Department of Polymer Chemistry, Kyoto University, Kyoto, Japan |
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Abstract: | The ordered structures are observed directly by the metallurgical microscope for the heavy (specific gravity=1.50) and monodisperse polystyrene type spheres in sedimentation equilibrium and in the presence of neutral polymers, polyvinylalcohol (PVA), polyethyleneglycol (PEG), polyvinyl-pyrrolidone (PVP), hydroxypropylcellulose (HPC), and polyacrylamide (PAAm). The intersphere distances in the ordered lattices decrease by the addition of neutral polymer in the order, PVA < PEG < PVP < HPC < PAAm. These effects of neutral polymers are reasonably well-explained by the intersphere repulsion from the electrical double layer interaction, which is influenced by the polymer adsorption on the latex surface by the hydrophobic and/or dipole-dipole interactions. |
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Keywords: | Orderedcolloids polystyrene latex neutralpolymer sedimentation hydrophobicinteraction |
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