二酸化チタン : 水懸濁液のダイラタント流動に及ぼす分散剤の影響

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Dilatant flow behavior was studied with a capillary viscometer over a shear rate range of 10^2-l0^6 sec<-1> for the aqueous suspensions of titanium dioxides which showed pseudoplastic flow in lower shear rates (10^<-2gt;-10^2sec<-1>). The dilatant flow of these suspensions was found to depend not only on the amount of sodium pyrophosphate but also on the diameter of suspended particles. From the sedimentation tests, the effects of both the amount of sodium pyrophosphate and the particle size on the dilatant flow were revealed to be closely associated with the degree of dispersion of suspended particles. With decreasing the degree of dispersion, the dilatant flow appeared in lower shear rates accompanied by an increase in the limiting viscosities at both low and high shear rates. This may be resulted from an increase in the effective volume fraction of particles including a part of dispersion medium entrapped between the flocculated particles. The degree of dispersion was dependent on particle size and showed maxima at different amounts of sodium pyrophosphate. From the measurement of the amount of adsorption of dispersing agent, however, it was proved that the degree of dispersion became maxima at the same equilibrium concentration of pyrophosphate ions irrespective of particle sizes. These results were successfully explained in terms of DLVO theory. The effect of the particle size on the relationship between the degree of dispersion and the equilibrium concentration of pyrophosphate ions may be attributed to the difference in the number of particles in unit volume.
社団法人日本材料学会の論文
1981-03-15

二酸化チタン : 水懸濁液のダイラタント流動に及ぼす分散剤の影響

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