懸濁性シロップ剤の物理化学的研究 (第1報)

電解質およびアニオン性界面活性剤の電気伝導度について

抄録

Electrical conductivity of sodium chloride, potassium chloride, and sodium lauryl sulfate in 0, 3, 10, 20, and 30% aqueous sucrose solutions was measured in concentration between 0.0002 and 0.04M. The apparent radius of Na⁺, K⁺, and Cl^- was calculated from the limiting equivalent conductivity Λ_∞ of sodium and potassium chloride in aqueous sucrose solutions on the basis of Stokes' law. The apparent radius of these ions decreased linearly with increasing sucrose concentration. This is considered to be due to the partial dehydration of ions by the addition of sucrose.
The equivalent conductivity Λ of sodium chloride, potassium chloride, and sodium lauryl sulfate decreased by the increase of sucrose concentration. The decrease of mobility of ions is considered to be due mainly to the increase of viscosity of the medium by the addition of sucrose. Λη₀-√c curves, however, showed that Λη₀ increased with sucrose concentration. This phenomenon seems to be due to the decrease of the radius of ions through dehydration by sucrose.
The critical micelle concentration of sodium lauryl sulfate decreased by the increase of sucrose concentration. This phenomenon is also considered to be due to dehydration by sucrose.