懸濁粒子の沈積状態に関する物理化学的研究(第4報)攪拌時における懸濁液の曲路率に関する研究

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Tortuosity and viscosity of aqueous suspension of coarse particles under stirring were studied. Porosity, ε, was adjusted by changing the particle concentration tortuosity, q, was measured by the conductirity method, viscosity by a rotation viscometer, and apparent aggregation degree (γ_m/γ_o) by the sedimentation method. Pyrimidine-penicillin G (PYG) (primary particle radius γ_o, 1.8 and 13.2 μ), Nylon spheres (γ_o, 2.9 and 38 μ), glass spheres (γ_o, 45 and 100 μ), glass bars, and salicylic acid of various sizes (radius/length) were used as the suspending particles. Sodium dodecyl sulfate, and polyvinyl-pyrrolidone were used as the suspending agent. Horizontal tortuosity, qH, was independent of the stirring speed when the latter was over 2000 rpm in the case of glass bars (100 μm), while the qH value was constant in the entire range of the stirring speed in the case of PYG (1.8 μ). Vertical tortuosity, q, was constant against all the stirring speeds tested. It was not affected by the viscosity and temperature of the suspension medium, but it took higher value when the ε value or the primary particle radius, γ_o, was smaller, or in the presence of a dispersing agent. In the case of larger γ_o, the curves of q against ε were located near the theoretical curves of q=ε^<-1/4>, which was derived from the two equations, f=ε^<3/2> and q=√<ε/f>. The former had been derived by Tobias for concentrated suspensions. Reduced viscosity η_<1sp>/C and structural viscosity index n showed higher values when ε and γ_o values were lower. Both η_<1sp>/C and n decreased in the presence of dispersing agents. Both q and η_<1sp>/C increased markedly for ε values of over 0.80,and also n increased markedly for ε values of over 0.70. Both η_<1sp>/C and n increased when q value was over 1.15. It was concluded that q, -η_<1sp>/C, and n are correlated with each other and vary according to the difference of ε, γ_o, and γ_m/γ_o.
公益社団法人日本薬学会の論文
1976-03-25

懸濁粒子の沈積状態に関する物理化学的研究(第4報)攪拌時における懸濁液の曲路率に関する研究

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