不同阴/阳离子表面活性剂复配体系的缔合结构研究

测定了十二烷基磺酸钠(AS)/十六烷基三甲基溴化铵(CTAB)/正丁醇(n-C4H9OH)/正庚烷(n-C7H16)/水(H2O),十二烷基硫酸钠(SDS)/十六烷基三甲基溴化铵(CTAB)/正丁醇(n-C4H9OH)/正庚烷(n-C7H16)/水(H2O)体系的微乳液正四面体相图,并用电导法划分了AS/CTAB/n-C4H9OH/n-C7H16/H2O体系微乳液的结构(W/O,B.C.和O/W);同时研究AS/CTAB/n-C4H9OH/n-C7H16/H2O/盐类(NaCl,CaCl2或AlCl3)体系和SDS/CTAB/n-C4H9OH/n-C7H16/H2O/盐类(NaCl,CaCl2或AlCl3)体系形成中相微乳的盐宽,从中得出上述两体系中相微乳的盐宽随盐类阳离子价态的增大而的规律。     

DEA与SDS/n-C5H11OH/H2O微乳液的相互作用

以循环伏安法研究了N,N-二乙基苯胺（DEA）与十二烷基硫酸钠（SDS）/正戊醇（n-C5H11OH）/H2O体系O/W和W/O结构微乳液的相互作用.结果表明,DEA在SDS/n-C5H11OH/H2O体系微乳液中有两种定位方式:其一,DEA分子在微乳液液滴膜相中定位于表面活性剂和助表面活性剂的极性基团附近;其二,DEA分子在微乳液液滴膜相中定位于表面活性剂疏水基团一侧.两种定位的分布与微乳液的结构和组成相关.     

青霉素G钾盐在CTAB胶束中的水解及其抑制

以紫外光谱法研究了青霉素G钾盐(Pen-K)在十六烷基三甲基溴化铵（CTAB）胶束体系中的水解反应, 并探讨了水解反应机理.结果表明, CTAB胶束对Pen-K的水解具有抑制作用; Pen-K在CTAB胶束体系水解时,体系pH值的变化与在水中相似, 表明H＋浓度对这种抑制作用影响较小.红外光谱和微极性研究表明,部分Pen-K钾盐定位于CTAB胶束栅栏层中, 增加了其稳定性.     

Inhibition of Triton X-100／n-C5H11OH／H2O System on Hydrolysis of Cephanone

The hydrolysis of cephanone in Triton X-100 micelle and Triton X-100/n-C5H11OH/H2O(O/W) microemulsion were studied by means of UV-Vis absorption spectroscopy. The results show that compared with water, Triton X-100 micelle and Triton X-100/n-C5H11OH/H2O (O/W) microemulsion can inhibit the hydrolysis of cephanone. The inhibition effects of Triton X-100 micelle and Triton X-100/n-C5H11OH/H2O (O/W) microemulsion on the hydrolysis of cephanone are related to the location of cephanone in the interphases of Triton X-100 miceUes and Triton X-100/n-C5H11OH/H2O(O/W) microemulsion droplets.     

SDS/n-C5H11OH/H2O溶致液晶中SDS分子的扩散特性

以铂微电极法测定了在SDS/n-C5H11OH/H2O溶致液晶中SDS（十二烷基硫酸钠）分子的扩散系数.结果表明,恒定质量比SDS/n-C5H11OH条件下,溶致液晶中SDS分子的扩散系数随体系中水含量的增加而增加；恒定质量比SDS/H2O,溶致液晶中SDS分子的扩散系数随正戊醇含量的增加而增加；恒定质量比H2O/n-C5H11OH ,溶致液晶中SDS分子的扩散系数随SDS含量的增加而降低.六角状液晶中SDS分子的扩散系数比层状液晶中SDS分子的扩散系数低约1个数量级,而比W/O、O/W胶束的扩散系数低3～5个数量级.     

青霉素G钾盐对SDS水溶液物理化学性质的影响及其在SDS/n-C5H11OH/H2O体系中的释放

The effects of penicillin potassium salt （PenK） on the solubility, Krafft temperature TK, critical micelle concentration CMC of SDS micelle and the phase behavior of SDS/n-C5H11OH/H2O system were studied. The partial phase diagrams of SDS/PenK/H2O system at different temperatures were determined. The release amounts of PenK in SDS/n-C5H11OH/H2O system and the distribution coefficient of PenK between micelle and water were measured by UV-Vis spectroscopy. The results show that in the presence of PenK, the CMC of SDS was decreased while the TK of SDS was increased and the solubility of SDS in both water and SDS/n-C5H11OH/H2O oil in water （O/W） microemulsion was decreased, but increased in water in oil （W/O） microemulsion. SDS micelles and SDS/n- C5H11OH/H20 O/W microemulsion could accelerate the release rate of PenK. The addition of SDS and water could both increase the release rate of PenK, whereas the presence of n-C5H11OH reduced the release rate of PenK. The above results were related to the electrostatic repulsion between PenK and SDS.     

Hydrolysis of Cephanone in SDS／n－C5H11OH／H2O System

The hydrolysis of cephanone in SDS micelle and SDS/n-C5H11-OH/H2O O/W microemulsion was studied through Uv-vis ab-sorption spectroscopy. The change of pH value in the hydrolysis of cephanone was determined. The result shows that pH value decreases in the process of the hydrolysis, and that the SDS ml-celle and SDS/n-C5H11OH/H2O O/W microemulsion accelerate the hydrolysis of cephanone compared with water.     

SDS/n－C5H11OH/n－C7H16/H2O体系中W/O－BI微乳液界面电性质

In the system of SDS/n-C5H11OH/n-C7H16/H2O with the weight ratio of SDS/n-C5H11OH/H2O system at5.0/47.5/47.5, the upper phase of the system was W/O microemulsion, and the lower phase was the bicontinuous microemulsion. When the n-heptane content was less than 1%, with the increase of the n-heptane content, the capacitance (Co, Cod) in the upper phase (W/O) dropped, the capacitance (CB1, CBld) in the lower phase (BI) raised. At the same time, the W/O-BI inteffacial potential (ΔE), capacitance (Ci), and charge-transfer current (ict) decreased.After the n-heptane content reached 1%, with the increase of the n-heptane content, ΔE, Ci and ict demonstrated no significant change.     

微乳液相行物为结构的研究:氯化钠/水/十二烷基硫酸钠/正丁醇/正辛烷系统

本文报道NaCl/H2O/SDS/n-C4H90H/n-C8H18系统在WC4H9OH/WSDS=4时, 不同盐浓度下的相图, 结果表明, 卤水中NaCl浓度的增大导致这个系统相分裂区域扩在, 并在一定范围内产生三相共存和出现中相微乳液。中相微乳液的密度, 粘度, 电导率和折光率与最佳盐浓度以及微观物型转变有对应关系, 红外光谱测定表明, 油相中氢键的缔合强度比中相微乳液显著增强。     

微乳液相行物为结构的研究:氯化钠/水/十二烷基硫酸钠/正丁醇/正辛烷系统

本文报道NaCl/H2O/SDS/n-C4H90H/n-C8H18系统在WC4H9OH/WSDS=4时, 不同盐浓度下的相图, 结果表明, 卤水中NaCl浓度的增大导致这个系统相分裂区域扩在, 并在一定范围内产生三相共存和出现中相微乳液。中相微乳液的密度, 粘度, 电导率和折光率与最佳盐浓度以及微观物型转变有对应关系, 红外光谱测定表明, 油相中氢键的缔合强度比中相微乳液显著增强。     

CTAB/n-C5H11OH/H2O体系对青霉素G钾盐水解的抑制作用

微乳液是由表面活性剂、助表面活性剂、水、油等组成的各向同性、低粘度的热力学体系［１］,在生物、环境及其相关领域有着十分重要的应用［２］．近年来,以微乳液为微反应器进行化学反应已引起重视［３－１０］青霉素是一种很重要的抗生素药物,它在阴暗干燥的空气中较...     

Hydrolysis of Cephanone in SDS/n-C_5H_(11)OH/H_2O System

IntroductionMicellesolutioncomposedofsurfactantscanaffect,adjustandcontrolmanychemicalreactionsaccordingtoitseffectsoflocalconcentration ,polarity ,charge ,microvis cosity,electrostatics ,etc ..1,2 Recently ,ithasarousedmuchattentiontoconductchemicalreactionsusingmi croemulsionasmicroreactor .3 7Theeffectofmicelleonthechemicalreactionstemsfromitsstaticelectricityandhy drophobicity .Usually ,cationicsurfactantcancatalyzethereactionbetweennucleophileandneutralmolecule ,whileanionicsurfactantsusp…     

Spectroscopy characterization of anthracene in SDS/BA/H2O system

Spectroscopy characterization of anthracene in sodium dodecyl sulfate (SDS)/benzyl alcohol (BA)/water (H(2)O) microemulsion was studied by UV-visible absorption and fluorescence emission spectroscopy. The impact of the composition and structure of the microemulsion on spectroscopy characterization of anthracene were discussed. At the same time, we indicated the location of anthracene in microemulsion. The results indicated that in O/W microemulsion in SDS/BA/H(2)O system, anthracene exists both in the membrane phase and oil core, while in W/O microemulsion, anthracene exists in the oil continuous phase.     

Fluorescence Quenching of Anthracene by N,N-Diethylaniline and Phenothiazine in Triton X-100/n-C10H21OH/H2O Microemulsion

IntroductionDuring the last decade,microemulsions haveplayed important roles in the development of bio-logical,material,environmental and other relatedfields[1— 4] .Although photo- induced electron trans-fer processes are of considerable interest in biologyand chemistry,up to now,most of the studies ofthe photo- induced electron transfer in micelle andinverse micelle have been limited to one- or two-component water/surfactant systems[5] .As theirextensions to microemulsion,only a very limited…     

吩噻嗪在十二烷基硫酸钠/苯甲醇/水微乳液中的定位

采用循环伏安法和荧光猝灭法研究了吩噻嗪（PTZ）在十二烷基硫酸钠（SDS）/苯甲醇（BA ）/ 水（H2O）微乳液中的定位.结果表明,吩噻嗪在十二烷基硫酸钠/苯甲醇/水体系微乳液中位于微乳液膜相中靠近表面活性剂极性头基的一侧,PTZ分子中的S原子和N原子均可朝向表面活性剂的极性头基.     

Electrochemical Oxidation of L-Cystenine in SDS／BA／H2O Microemulsion

The electrochemical oxidation of L-cysteine in an SDS/BA/H2O microemulsion system was studied with the methods of ultramicroelectrode cyclic voltammetry and AC impedance. The catalytic efficiency of the microemulsion on the electrochemical oxidation increases with the increase of BA or SDS content, but decreases with the increase of the water content because of the effects of BA, SDS and water on the solubilization of Lcysteine in the microemulsion. Furthermore, the catalytic efficiency of the bicontinuous structure is greater than that of an O/W microemulsion system. The results derived from both the rate constant k^0 and Gibbs free energy △G^≠ accord with those from the catalytic efficiency.