懸濁粒子の沈積状態に関する物理化学的研究(第9報)単分散および凝集粒子の沈積層の曲路率について

概要

論文の詳細を見る
Tortuosity was measured by the water permeation method (qw) and the electrical conductivity method q (qv, vertical ; qw, horizontal) on the sedimentation beds of monodispersed particles of glass sphere and sea sand, and aggregated particles of calcium carbonate. Water and aqueous solutions of potassium chloride, sodium dodecyl sulfate, and sodium polyacrylate were used as the suspending medium. The values of qw thus obtained were in the range of 1.4-1.5 which was nearly equal to Carman's value of qw=√<2>, while the values of q were in the range of 1.05-1.20. From the result that qw>q, it was considered that water and ion flow through different voids in the sedimentation beds, and a theoretical equation (Eq. (15)) was derived, which gives the values of q as a function of the porosity of sedimentation beds ε, porosity between secondary particles, ε_<ext>, and conductivity ratio inside the secondary particles, f_<in>. For the sedimentation beds of monodispersed particles, Eq. (15) can be reduced to a simple equation ; q=√<ε^2+(1-ε) qw> Eq. (16). Values of q calculated by this equation were in good agreement with the experimental values of qv for monodispersed particles of glass sphere and sea sand. For the aggregated suspension of calcium carbonate, it was concluded that ions go through inside the secondary particles.
公益社団法人日本薬学会の論文
1978-02-25