Miniemulsions were prepared using mixed emulsifiers comprising of fatty alcohols ROH (C5OH-C16OH) and ionic or noinonic surfactants in low concentration.As a cosurfactant, fatty alcohol served as an aid for decreasing...Miniemulsions were prepared using mixed emulsifiers comprising of fatty alcohols ROH (C5OH-C16OH) and ionic or noinonic surfactants in low concentration.As a cosurfactant, fatty alcohol served as an aid for decreasing the interfacial tension and increasing the lifetime of oil drops at the oil-water interface. The mixed emulsi fier R(EO)12-NP(EO)2-ROH(R=C5-C8) could spontaneously form O/W miniemulsion in kerosene-water system.展开更多
The variation of iinterfacial tension with temperature of two different systems, water-oil (liquid paraffin, C18H38, solution of solid paraffin)and silicone oil-vegetable oil was determined and the factors that influe...The variation of iinterfacial tension with temperature of two different systems, water-oil (liquid paraffin, C18H38, solution of solid paraffin)and silicone oil-vegetable oil was determined and the factors that influence the variation of the shape of the relation curves were examined.It is found that the presence of minute amount of surface active impurity was the main cause of the shape variation of the relation curves. The shape variation was eliminated by adsorptive agent.Therefore, it is important to insure purity of the experimental system in order to obtain reliable results on the study of thermocapillary flow caused by interfacial tension.展开更多
The formation and structure of liquid crystal in Tween 80, Tween 85, Tween 85-Span 80 and H2O systems were studied. At room temperature, the results of low angle X-ray diffraction showed that hexagonal liquid crystal ...The formation and structure of liquid crystal in Tween 80, Tween 85, Tween 85-Span 80 and H2O systems were studied. At room temperature, the results of low angle X-ray diffraction showed that hexagonal liquid crystal was formed in Tween 80-H2O system, whereas in Tween 85- H2O and Tween 80-Span 80 (7:3)-H2O systems lamellar liquid crystal was formed. In two lamellar crystal phases the thickness of amphiphilic layer was 66.8A and 68.0A respectively. The penetration of water in Tween 85 liquid crystal phase was higher than in Tween 80-Span 80 liquld crystal phase.展开更多
Formation and structure of liquid crystal in lecithin-water-oleic acid system were studied. It was found that different from the lecithin-water system, there are two types of llquid crystal present. The lamellar liqui...Formation and structure of liquid crystal in lecithin-water-oleic acid system were studied. It was found that different from the lecithin-water system, there are two types of llquid crystal present. The lamellar liquid crystal was formed at lower content of oleic acid, the values of interlayer spacing are larger tha-n the values in the corresponding liquid crystal without oleic acid. The inverse hexangonaJ liquid crysta1 was formed at higher content of oleic acid. In lecithin-water-oleic acid(containing 15 % cholesterol) system the phase behavior of liquid crystal is sidrilax to that in the lecithin-water-oleic acid system. The solubillzation rate of solid cholesterol in lammellar liquid crystal of lecithinwater-oleic acid system is more faster than that of lecithin-water system.展开更多
Using the mixture of cationic surfactant cetyltrimethylammonium bromide(CTAB) and six nonionic surfactants as templates, meso porous silica was synthesized. The d space of silica templated by CTAB is 3.5 nm. The d spa...Using the mixture of cationic surfactant cetyltrimethylammonium bromide(CTAB) and six nonionic surfactants as templates, meso porous silica was synthesized. The d space of silica templated by CTAB is 3.5 nm. The d spaces could be controlled by changing the ratio of nonionic to cationic surfactants and by increasing the length of nonpolar chain of nonionic surfactants in the mixed cationic nonionic surfactant templating systems. The pore dimension of silica in the mixed surfactants templating system is larger than that in CTAB system and a well ordered structure of pore array was maintained. [WT5HZ]展开更多
文摘Miniemulsions were prepared using mixed emulsifiers comprising of fatty alcohols ROH (C5OH-C16OH) and ionic or noinonic surfactants in low concentration.As a cosurfactant, fatty alcohol served as an aid for decreasing the interfacial tension and increasing the lifetime of oil drops at the oil-water interface. The mixed emulsi fier R(EO)12-NP(EO)2-ROH(R=C5-C8) could spontaneously form O/W miniemulsion in kerosene-water system.
文摘The variation of iinterfacial tension with temperature of two different systems, water-oil (liquid paraffin, C18H38, solution of solid paraffin)and silicone oil-vegetable oil was determined and the factors that influence the variation of the shape of the relation curves were examined.It is found that the presence of minute amount of surface active impurity was the main cause of the shape variation of the relation curves. The shape variation was eliminated by adsorptive agent.Therefore, it is important to insure purity of the experimental system in order to obtain reliable results on the study of thermocapillary flow caused by interfacial tension.
文摘The formation and structure of liquid crystal in Tween 80, Tween 85, Tween 85-Span 80 and H2O systems were studied. At room temperature, the results of low angle X-ray diffraction showed that hexagonal liquid crystal was formed in Tween 80-H2O system, whereas in Tween 85- H2O and Tween 80-Span 80 (7:3)-H2O systems lamellar liquid crystal was formed. In two lamellar crystal phases the thickness of amphiphilic layer was 66.8A and 68.0A respectively. The penetration of water in Tween 85 liquid crystal phase was higher than in Tween 80-Span 80 liquld crystal phase.
文摘Formation and structure of liquid crystal in lecithin-water-oleic acid system were studied. It was found that different from the lecithin-water system, there are two types of llquid crystal present. The lamellar liquid crystal was formed at lower content of oleic acid, the values of interlayer spacing are larger tha-n the values in the corresponding liquid crystal without oleic acid. The inverse hexangonaJ liquid crysta1 was formed at higher content of oleic acid. In lecithin-water-oleic acid(containing 15 % cholesterol) system the phase behavior of liquid crystal is sidrilax to that in the lecithin-water-oleic acid system. The solubillzation rate of solid cholesterol in lammellar liquid crystal of lecithinwater-oleic acid system is more faster than that of lecithin-water system.
文摘Using the mixture of cationic surfactant cetyltrimethylammonium bromide(CTAB) and six nonionic surfactants as templates, meso porous silica was synthesized. The d space of silica templated by CTAB is 3.5 nm. The d spaces could be controlled by changing the ratio of nonionic to cationic surfactants and by increasing the length of nonpolar chain of nonionic surfactants in the mixed cationic nonionic surfactant templating systems. The pore dimension of silica in the mixed surfactants templating system is larger than that in CTAB system and a well ordered structure of pore array was maintained. [WT5HZ]
