Spontaneous formation of tubular microstructure vesicle from PTA／SDS system

Spontaneous vesicle formation and transformation of vesicle to tubular microstructure have been observed in aqueous mixtures of tri-(n-dodecyl-dimethyl-hydroxy-propylammonium chloride) phosphate (PTA) and sodium dedecyl sulfate (SDS), which is supported by negative-staining transmission electron microscopy (TEM), scan electron microscopy (SEM) and dynamic light scattering (DLS). Spherical vesicles aggregate to tubular microstructures with their diameters and lengths respectively of about 100 and 7000 nm in the freshly prepared sample at the molar ratio of PTA/SDS=3/7 and a total surfactant concentration of 0.01 mol/L. The diameter, the length and the quantity of tubular structures all increase with the increase of the total concentration of surfactant and the sample aging.     

Spontaneous vesicle formation from DSB／AOT mixed system

Spontaneous vesicles from the aqueous mixtures of dodecyl sulfonate betaine (DSB) and sodium bis (2-ethylhexyl) sulfosuccinate (AOT) at certain mixing ratios have been demonstrated by using calorimetry, freeze-frac-ture transmission electronic microscopy (TEM), negative-staining TEM and dynamic light scattering (DLS) methods. The addition of NaCl will promote vesicle formation and the heat effect of monodisperse vesicle system is greatest. Meanwhile the mechanism was analyzed from the viewpoint of packing parameter f, molecular geometry structure and interaction.     

十二烷基甜菜碱/正丁醇/正辛烷/盐水体系中相微乳液研究

两性表面活性剂十二烷基甜菜碱（Ｃ１２ＢＥ）,在正丁醇,正辛烷,盐水存在的情况下,能形成多相微乳液．本文系统地研究了表面活性剂,正丁醇和氯化钠的浓度对该体系的中相微乳液的形成及特性的影响,得到了中相微乳液的特性参数（最佳含盐量Ｓ＊,界面张力ｒＥ和盐宽△Ｓ等）．     

醇从油相转移到AEO-9微乳液液滴界面自由能的研究

从微乳液相图出发,在富油区选取研究体系,通过加油到微乳液破坏,再加醇到微乳液恢复的数次重复操作,得出 ｎａ／ ｎｓ ～ ｎｏ／ ｎｓ 的相关直线,得到正己醇、正辛醇从油相转移到微乳液液滴界面的标准自由能 Δ Ｇｏ →ｉ ． 并且对计算公式进行讨论,提出正确使用该公式的切实可行的方法     

Formation of wormlike micelles in anionic surfactant AES aqueous solutions

The growth and structure of anionic micelles of sodium dodecyl trioxyethylene sulfate (AES) in the presence of multivalent counterion Al³⁺ were investigated by means of dynamic rheological methods. It has been obtained by the measurements of shear viscosity, complex viscosity and dynamic moduli, as well as the application of Cox-Merz rule and Cole-Cole plot that wormlike micelle and network structure could be formed in AES/AlCl₃ aqueous solutions. The structure was of a character of nonlinear viscoelastic fluid and departure from the simple Maxwell model. The technique of freeze-fracture transmission electron microscopy (FF-TEM) was also used to confirm the formation of this interesting structure.     

DCDAC/正丁醇/水体系溶致液晶的研究

测定了双十六烷基二甲基氯化铵正丁醇／水体系三元相图,确定了溶致液晶区的存在．应用２Ｈ核磁共振的方法结合液晶纹理像片做对照,对液晶的精细结构变化进行了研究．并利用差示扫描量热手段对液晶的相态转变进行了探讨．     

A study of the microstructure of CTAB/1-butanol/octane/ water system by PGSE-NMR and Cryo-TEM

In this work, the effect of octane concentration on the phase behavior of CTAB/water/1-butanol system was studied by using pulsed field gradient spin-echo NMR measurements and freeze fracture electron microscopy (Cryo- TEM and FFEM). When the octane concentration increases, the liquid crystalline phase is destabilized and a continuous single-phase microemulsion region from the water apex to the oil apex is formed. The conductivity behavior has a distinct percolative phenomenon, which indicates that the single-phase microemulsion is changed continuously from oil- in-water (o/w) structure via a bicontinuous structure to water-in-oil (w/o) structure. This result is consistent with those of the PGSE-NMR, Cryo-TEM, and FFEM. In the w/o region, the self-diffusion coefficient of water is relatively high ((1—6)×10^-10 m·s^-1) due to the higher solubility of water in the continuous phase consisting of octane (10% by weight) and 1-butanol. The penetration of a large amount of octane molecules between surfactant chains results in the much lower self-diffusion coefficient of octane.     

以有机酸为助表面活性剂的微乳液研究

以中碳链长有机酸 C_4H_9COOH 到 C_6H_(13)COOH 为助表面活性剂,与表面活性剂 OS(油酸钠),十二烷和水四组分构成微乳液体系.研究了有机酸分子量和体系含油量对微乳液相图影响;从相图出发得到一系列 n_a/n_s 和 n_o/n_s 数据,两者关联作图得到直线,由其斜率和截距计算出有机酸从油相转移到微乳液液滴界面相的标准热力学函数△G_(0→i)~0,△H_(0→i)~0 和△S_(0→i)~0;用计算机拟合它们与有机酸的碳链长的关系式;并对其结果作了理论探讨.