纳米白炭黑对含盐四氯化碳-水乳状液稳定性的影响

 以纳米白炭黑作为固定稳定剂, 在不同乳化机转速(ω) 和白炭黑质量分数(w)的条件下, 制备了一系列四氯化碳-水(体积比1:1)的乳状液, 用氯化钾为背景电解质, 电导法测定了这些乳状液富油相在不同陈化时间的电导率. 以增比电导率κ_r和初始分层速率常数k_eo的概念, 分析了乳状液的动力学稳定性. 结果表明, 当白炭黑质量分数w=0.2%时, 乳状液的初始分层速率常数k_eo随乳化机转速ω的增加而线性下降; 当ω=4000r/min时, 乳状液的初始分层速率常数k_eo随白炭黑质量分数w的增加而下降, 但w在0～0.5%范围时下降幅度大, w>0.5%时下降缓慢.

EFFECTS OF NANOMETER CARBON WHITE ON STABILITY OF CARBON TETRACHLORIDE-WATER EMULSION IN PRESENCE OF BACKGROUND ELECTROLYTE

Carbon tetrachloride-water emulsions stabilized by nanometer carbon white were prepared at different rotating speeds of homogenizer and contents of carbon white. The electrical conductivities in oil-concentrated phase of emulsions were measured at different aging time and in presence of potassium chloride acting as background electrolyte. The incremental ratio of electrical conductivity ( r) in oil-concentrated phase and the initial creaming rate constant (ke0) of emulsion were used to describe the relationship between stability and the electrical conductivity of emulsions. It was concluded that the initial creaming rate constant of emulsion (ke0) decreased linearly with the increase of rotating speed of homogenizer( ) in presence of 0.2% carbon white, and also decreased with the increase of mass fraction of carbon white(w) at fixed 4000r/min of homogenizer. The decrease of ke0 with w as w in the range of 0~0.5% was faster than as w 0.5%.