Mixed Colloidal Dispersions of Silica and Hematite

DOI PDF 被引用文献2件 参考文献9件
  • Kunio Esumi
    Department of Applied Chemistry, Institute of Colloid and Interface Science, Science University of Tokyo
  • Hiroyuki Idogawa
    Department of Applied Chemistry, Institute of Colloid and Interface Science, Science University of Tokyo
  • Kenjiro Meguro
    Department of Applied Chemistry, Institute of Colloid and Interface Science, Science University of Tokyo

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<jats:title>Abstract</jats:title> <jats:p>The colloidal behavior of mixed dispersions containing hematite (diameter=138.9 nm) and silica (diameter=7.0 nm) has been studied by measuring the stability ratio, zeta potential, and particle size. When various particle numbers of silica were added to a constant particle number of hematite, different colloidal behavior was observed, depending on the pH. In a pH region where the two solids were oppositely charged, hematite particles showed a dispersion-coagulation-redispersion process with increasing particle number of silica, resulting in a coating layer of silica particles on the hematite surface. On the other hand, in a region where both solids were negative, the addition of silica enhanced the stability of the hematite.</jats:p>

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