期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 278, 期 1, 页码 115-125出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2004.05.020
关键词
heteroaggregation; heterocoagulation; repeptization; colloidal dispersions; silica; electrophoresis; cryogenic electron microscopy
We report a study of mixtures of initially oppositely charged particles with similar size. Dispersions of silica spheres (negatively charged) and alumina-coated silica spheres (positively charged) at low ionic strength, mixed at various volume ratios, exhibited a surprising stability up to compositions of 50% negative colloids as well as spontaneous repeptization of particles from the early-stage formed aggregates. The other mixtures were found to contain large heteroaggregates, which were imaged using cryogenic electron microscopy. Electrophoretic mobility, electrical conductivity, static and dynamic light scattering and sedimentation were studied as a function of volume fraction of the mixed dispersions to investigate particle interactions and elucidate the repeptization phenomenon. (C) 2004 Elsevier Inc. All rights reserved.
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