73.ガラスビーズの表面改質を用いた石炭モデル粒子の作製と粒子・気泡間付着現象の検討(石炭利用における科学と工学の融合)  [in Japanese] 73. A Study on Modification of Glass beads Surface for Model Coal Particles and on Attachment of These Particles to Bubbles  [in Japanese]

The preparation of model particles having controlled hydrophobic/hydrophilic surfaces was attempted to investigate flotation behavior of coal in a column flotation process quantitatively. The surface properties of glass beads with ca. 50μm diameter were modified by chemical vapor deposition of 1, 3, 5, 7, -tetrametyltetracyclosiloxane (H-4), followed by catalytic hydrosilylation with vinylacetic acid. The CVD of H-4 was performed for making the surface of glass beads hydrophobic and the successive hydrosilylation allowed us to prepare particles with moderate hydrophilic surfaces. The CVD conditions to adjust hydrophobicity of glass beads were explored. The surface properties of these particles and their distribution were evaluated by means of a film flotation technique. The bubble-particle attachment probability was preliminary studied using these model particles.