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Zheng Wu WANG Gan Zuo LI* Jian Hai MU Xiao Yi ZHANG An Jing LOU Key Lab of Colloid Interface Chemistry for State Education Ministry Shandong University Jinan Department of Chemistry Guizhou Normal University Guiyang Lan 《中国化学快报》2002,13(4):363-366
When a surfactant is solved into a solvent, it will adsorb onto the surface of the solution and reduce the surface free energy to a marked degree. The surface free energy, which is the minimum amount of work required to create that surface, is usually measured by surface tension. The minimum of surface tension 0g is the most useful key for characterizing the activity of surfactant. It is well known that 0g is determined by the molecular structure of surfactant, i.e., the contributions from … 相似文献
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以一系列难溶性的二氢吡啶类钙离子通道阻滞剂作为模型药物,以自乳化面积和药物在自乳化给药系统(SEDDS)中的溶解度作为自乳化评价指标,建立各组分的分子描述参数与自乳化性质之间的定量函数关系,通过模型讨论分子结构对自乳化形成机理的影响.结果表明,自乳化的发生是各组分含量、分子间作用力、亲脂性和分子大小等多方面因素综合作用的结果.当混合表面活性剂分子较大且药物脂溶性较好时,SEDDS对难溶性药物的增溶能力较强;表面活性剂与助表面活性剂的质量比较大,混合表面活性剂的分子较大时,SEDDS的稀释稳定性较好. 相似文献
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IntroductionCriticalmicelleconcentration (cmc)ofsurfactantsinaqueoussolutionisoneofthemostusefulparametersforcharacterizingthepropertiesofsurfactants.Overaverynarrowconcentrationrangearoundthecmctransitionsoftheexistenceofsurfactantsoccurfrommonomer ,premicel lartomicellar .Andcompanyingthesetransitions ,manyotherimportantpropertiesofsurfactantsolution ,suchassurfacetension ,interfacialtension ,conductivity ,osmoticpressure ,detergency ,emulsification ,foamingandsoon ,alsochangesharplyatthepoi… 相似文献
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A. M. Al-Sabagh E. M. S. Azzam M. R. Noor El Din 《Journal of Dispersion Science and Technology》2013,34(2):260-266
A series of ethoxylated sodium monooctyl sulfosuccinates [E(n)SMOSS] and ethoxylated sodium monolauryl sulfosuccinates [E(n)SMLSS] have different units of ethylene oxide (n = 9, 14, 23) were synthesized. The surface and thermodynamic properties of these surfactants have been compared with sodium dioctyl sulfosuccinate surfactant (SDOSS) as a commonly used surfactant. The surface tension measurements at 25, 35, 45, and 55°C were used to determine of the critical micelle concentration (CMC) and surface active properties of these surfactants. The effect of the ethylene oxide (EO) unit and the alkyl chain length on the surface properties for the prepared surfactants was studied. The results show that the ethoxylated sodium monoalkyl sulfosuccinates generally have lower values of CMC than that of sodium dioctyl sulfosuccinate. The values of surface active parameters indicate that the ethoxylated sodium monooctyl sulfosuccinates and ethoxylated sodium monolauryl sulfosuccinates surfactants have adsorption properties better than the sodium dioctyl sulfosuccinate surfactant as a resulted presence of ethylene oxide in molecules of the prepared surfactants. The thermodynamic parameters show that the (EO) unites in the chemical structure of ethoxylated sodium monoalkyl sulfosuccinate surfactants improve their micellization and adsorption properties. 相似文献