Surfactant Environment Simulate The Water Temperature And Species Concentration Response Thermodynamic Resolution,

In order to study thermodynamic behaviors of microscopic aggregation in environmental aqueous phase, NaCl , FeCl3 , A1C13 and SDS are selected as model substances to simulate the complex environmental aqueous process. The thermodynamical characteristics and its effectors are discussed. It is supposed as basic data and reference to academic research.The effect of monovalent electrolyte, NaCl, on the physical chemistry behavior of SDS aqueous solution is researched. The response of surface tension a, conductivity K, and viscosity with temperature and concentration of the components are traced from 25 C to 75 C ( A T=5 C) . Critical micellar concentration of SDS/NaCl is obtained from surface tension curve. Then thermodynamic parameters of corresponding microscopic aggregation are obtained using Mass-Action Model. micG is negative, is well fit with T and ln(CNacl) on straight line; micH and micS are both positive, and Enthalpy-entropy compensation is observed. T* micS is much larger than micH , indicating that the process of micellization belongs to entropy driving process. There is a linear relation between the conductivity of SDS/NaCl and temperature at lower concentration, and a quadratic linear at higher concentration. Their temperature responsebehavior can be well described by ln = - + B. Based on the data, the values ofconductivity activation energy Ea are obtained. Before CMC, Ea changes with the concentration of NaCl much more complexly. And after CMC, Ea decreases with the increasing of the concentration of NaCl. Observed that temperature affects viscosity of SDS/NaCl solution greatly, and their temperature response behavior is well described byln = + B. Based on these data, viscosity activation energy AE is obtained. AE isnearly constant, close to that of pure H2O.The effect of trivalent electrolytes, FeCl3, A1C13 on SDS aqueous is also researched by means of surface tension, conductivity and viscosity. At the same ionic strength, the effect of the cations with different valence on CMC is not obviously different. There is a quadratic linear relation between the conductivity of SDS/A1C13 and temperature, and the temperature response behavior of the conductivity of SDS/FeCl3 can be well described by Its Ea is approaching to SDS/NaCl solution below CMC and is muchlarger above CMC. At different temperature, viscosity of SDS/ A1C13 aqueous solutionchanges with the concentration of AlCl3 in the same way, and when the rate of concentration of SDS/AlCl3 is up to 1:0.4-1:0.3, the infinitesimal viscosity appears at SDS/AlCl3 solution. The infinitesimal viscosity appears at the rate of concentration of SDS/FeCl3 is up to 1:0.4. At the same concentration of electrolyte, viscosity of SDS/FeCl3 is lower that of SDS/A1C13.