Surfactant Nature Of The Non-aqueous Solution And Application Of Research

Application of surfactant in non-aqueous solution has attracted wide attention now, such as extraction in reverse micelles, enzyme catalysis reactions in reverse micelles, but the study of surfactant properties in non-aqueous solution is still not enough.Dioctyl sulfosuccinate sodium salt(AOT) is the surfactant that was used the most in reverse micelles system. To realize the properties of surfactants in non-aqueous solution, so that they can be applied better, the critical micelle concentration (CMC) and thermodynamic function(ΔHmθ,ΔGmθandΔSmθ) of diocryl sulfosuccinate sldium salt in the N,N-dimethylformamide (DMF)/long-chain alcohol (n-pentanol, n-hexanol, n-heptanol, n-octanol)systems were studied using microcalorimetric method. And the relationships between alcohols' concentrations, carbon number, temperature and CMC, thermodynamic properties were discussed. It can be concluded as follows:under the condition of the identical alcohols' carbon number and identical concentration of alcohols, the values of CMC,ΔHmθandΔSmθincrease, while the values ofΔGmθdecrease with the increment of the temperature. And under the identical condition of temperature and alcohol's carbon number, all the values of CMC,ΔHmθ,ΔGmθandΔSmθdecrease with the increment of the alcohols' concentrations. And when the temperature and alcohols' concentrations are the same respectively, all the values of CMC,ΔHmθ,ΔGmθandΔSmθdecrease with the increment of the alcohols' carbon number.For their application, the optimal conditions for enzymatic cellulose degradation in the reverse micellars system formed of AOT was studied. And to reduce the electrostatic interaction between surfactant and enzyme, and enhance the enzyme activity, n-octanol was added to the dioctyl sulfosuccinate sodium salt(AOT)/iso-octane reverse micellar system. And the influences of the concentration of n-octanol(c), the molar ratio of water to surfactant (wo), pH and temperature(T) on enzymatic degradation of cellulose in AOT/n-octanol/iso-octane reverse micellar system have been investigated in this paper using microcalorimetric method. The results obtained indicate that the addition of n-octanol can enhance the cellulase activity, and the optimal conditions for enzymatic degradation of cellulose in the reverse micellar system mentioned above was c=0.11mol·L-1,wo=3.1, pH=5.01, T=315.57K. And at last, the influence of metal ions on the enzymatic cellulose degradation was studied too.The innovation of this paper:1. Surfactant's critical micelle concentration (CMC) and thermodynamic function in non-aqueous solution and enzymatic reaction in reverse micelles were shtudied in this paper using microcalorimetric method, which was a new method of studying properties and application of substances. 2. The power-time curves of surfactant in non-aqueous solution was gotton when forming reverse micellars using microcalorimetric method, from which the critical micelle concentration (CMC) was obtained, and further the thermodynamic function (△Hm0,△Gmθand△Smθ) of the process of the formation of reverse micelles, which could provide us useful data when studying the properties of surfactant in non-aqueous solution.3. The optimal condition of enzymatic cellulose degradation in reverse micellars system and the influence of metal ions on the reaction was studied using microcalorimetric method, which can provide theoretical basis for the industrial degradation and application of cellulose.