摘要
水+乙醇+碳酸钾三元体系在DCP(doublecriticalpoint)和CDP(criticaldoublepoint)附近,存在两个高临界点和一个低临界点.改变该三元系中醇与水的比例可使DCP和CDP消失,体系在相当大的温度范围内仅存在一个高临界点,从而使共存曲线的跨接临界行为的研究更简单和直接.报道了水+乙醇+碳酸钾三元体系在醇与水的质量比例分别为0.3699和0.5042时,温度向单一的高临界点逼近过程中共存曲线从平均场行为到3DIsing行为的跨接,发现跨接属于非单调的类型,此结果符合Sengers等的理论.
There exist two upper critical points and one lower critical point near the DCP （double critical point） and CDP （critical double point） in the ternary mixtures of ethanol, water and potassium carbonate. The DCP and CDP were avoided by changing the mass ratio of ethanol to water to reach the regions where only one upper critical point exists. In this simple region, the coexistence curves of temperature-refractive index were measured for the mass ratios of ethanol to water being 0.3699 and 0.5042 to examine the crossover critical behaviour. It was found that the crossover is nonmonotonic and consistent with Sengers＇ crossover theory.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
2005年第18期1709-1712,共4页
Acta Chimica Sinica
基金
国家自然科学基金(Nos.20473035
20173024
20273032)资助项目.
