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.     

十二烷基硫酸钠/苯甲醇/水微乳液中吩噻嗪对蒽的荧光猝灭

吩噻嗪与蒽之间可以发生光诱导单电子转移反应. 用荧光光谱仪研究了十二烷基硫酸钠(SDS) / 苯甲醇(BA) / 水微乳液中吩噻嗪对蒽的荧光猝灭.结果表明，在W/O微乳液中，蒽位于苯甲醇连续相，吩噻嗪位于膜相，猝灭反应发生于膜相；而在O/W微乳液中，蒽既可位于油核中，也可位于膜相，吩噻嗪位于膜相，猝灭反应亦发生于膜相.     

Fluorescence Quenching of Anthracene by N,N-Diethylaniline and Phenothiazine in CTAB/n-C5H11OH/H2O Microemulsion

Photoinduced electron transfer reactions of anthracene with N,N-diethylaniline (DEA) and phenothiazine (PTZ) occurred in the membrane phase of the CTAB (hexadecyltrimethylammonium bromide)/n-C₅H₁₁OH (1-pentanol)/H₂O micro-emulsion. DEA and PTZ exist in the membrane phase of the microemulsion because the presence of vitamin-C (Vc) can change the quenching constant. The change of the quenching constant for the DEA–anthracene system with the presence of Vc is more obvious than that for the PTZ–anthracene system. Thus, the DEA molecules are much closer to the polar head of the microemulsion than PTZ. Compared with DEA, the distribution of PTZ in the microemulsion tends to follow Poisson statistics.     

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.     

Microenvironment Effect on the Location Distribution of Phenothiazine in Cetyltrimethylammonium Bromide/<Emphasis Type="Italic">n</Emphasis>-Pentanol/H<Subscript>2</Subscript>O W/O and Bi-continuous Microemulsions

In cetyltrimethylammonium/n-pentanol/H₂O W/O (W/O = water in oil microemulsion) mixtures and bi-continuous microemulsions, phenothiazine (PTZ) molecules exist in the membrane phase of the dispersion either with the N atom or with the S atom pointed toward the polar head of cetyltrimethylammonium (CTAB). Cyclic voltammetry has been used to investigate the effects of the compositions and structures of the microemulsions, pH, and the salt on the location distribution of PTZ in the membrane phase of the dispersion in CTAB/n-C₅H₁₁OH/H₂O W/O and bi-continuous microemulsions. The results show that the location distribution of PTZ in the membrane phase of the dispersion in microemulsions is mainly dependent on the hydrogen bond between PTZ and n-C₅H₁₁OH (or the counterion), and on the electrostatic attractive interaction between the N atom in PTZ and the polar head of CTAB.     

蒽在SDS/BA/H2O体系中的光谱特征

用紫外-可见吸收光谱和荧光发射光谱研究了蒽在不同组成和结构的十二烷基硫酸钠(SDS)/苯甲醇(BA)/H20微乳液中的光谱特征,探讨了微乳液组成和结构对蒽光谱特征的影响,阐述了蒽在微乳液中的定位。结果表明,蒽位于O/W微乳液的膜相和油核;在SDS/BA/H2O W/O微乳液中,蒽定位于油连续相。     

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.     

Location of phenothiazine in sodium dodecyl sulfate/n-pentanol/water microemulsions

The location of phenothiazine (PTZ) in sodium dodecyl sulfate (SDS)/n-pentanol (n-C5H11OH)/water microemulsions is studied by cyclic voltammetry at a Pt electrode. The results indicate that PTZ exists in the membrane phase of microemulsion droplets with its N atom or S atom toward the polar head of the surfactant. In addition, we examine the effect of the compositions and structures of the microemulsions, pH, temperature, and the inorganic salts on the location distribution for PTZ in the membrane phase of the microemulsions. The results show that the location distribution for PTZ in the membrane phase of the microemulsions is mainly dependent on the hydrogen bond between the -NH in PTZ and n-pentanol (or the -SO4- of SDS) and on the electrostatic interaction between the S atom (or N atom) in PTZ and the polar head of SDS.     

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.     

十二烷基磺酸钠微乳状液结构转变的电化学研究

制备了C12H25SO3Na-C4H9OH-C7H16-H2O四组分体系在km=W(C4H9OH)/W(C12H25SO3Na)=2时的拟三元相图。使用二茂铁和铁氰化钾作为电化学探针用循环伏安法测定了起始含油量为21％的无水混合物在滴加水过程中所形成的微太液的扩散系数。从扩散系数随含水量的变化确定微乳液的结构转变。含水量为20％－45％时生成油包水型微液;含水量大于65％时生成水包油型微乳液。当含水量在45％－65％之间时形成的是二连续型微乳液。电导率数据证实了循环伏安法的测定结果。     

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。     

无表面活性剂微乳液体系：N,N－二甲基甲酰胺/呋喃甲醛/水

通常微乳液一般由四个组分构成：水相、油相、表面活性剂和助表面活性剂。本文报道了一种不含表面活性剂的微乳液体系(简称SFME),由呋喃甲醛(油相),水和N,N－二甲基甲酰胺(DMF)三组分构成,不含传统的表面活性剂。对其相行为进行了研究,发现存在一个单相微乳液区和一个两相平衡区。采用电导率法和冷冻蚀刻电镜(FF-TEM)考察了单相区域中微乳液的微结构,结果表明可分为油包水(O/W)、双连续(BC)和水包油(W/O)三个区域。液滴直径介于40-70nm。     

Fluorescence Quenching of Anthracene by N,N-Diethylaniline in the Sodium Dodecyl Sulfate/Benzyl Alcohol/Water System

Photoinduced electron-transfer reaction of anthracene with N,N-diethylaniline (DEA) was studied in the SDS (sodium dodecyl sulfate)/BA (benzyl alcohol)/H₂O system. In an oil/water microemulsion, only the excited anthracene located at the interface can be quenched by DEA. In a water/oil microemulsion, this quenching reaction occurs in the BA continuous phase. Besides being the quencher of the excited anthracene, DEA could also change the system's structure.     

Fluorescence quenching of anthracene by N,N-diethylaniline in the O/W microemulsion

Photoinduced electron-transfer system of anthracene-N,N-di-ethylaniline (DEA) was studied in the oil in water (O/W) mi-croemulsions formed by SDS (sodium dodecyl sulfate),BA (benzyl alcohol) and H2O.The time-resolved fluorescence study showed that the fluorescence quenching of the excited anthracene by DEA occurs at the interface of the O/W mi-croemulsions.Besides as the quencher of the excited anthracene,N,N-diethylaniline could act as a cosurfactant to change the structures of the microemulsions,just as BA did.The quenching rate constants for the different structures of the system were determined.     

The Catalysis of Sodium Dodecyl Sulfate／1-Pentanol／Water W／O Microemulsion on the Photoisomerization of trans-Stilbene

The photoisomerization of trans-stilbene was studied in the water in oil (W/O) microemulsion formed by SDS (sodium dodeeyl sulfate), n-C5H11OH (1-pentanol) and H2O. The experimental results show that after 2-minute UV-irradiation, the yield of cis-stilbene is higher in W/O mieroemulsion than in homogeneous solvent-n-C5H11OH.     

Interaction of methemoglobin with GDA/n-C5H11OH/water assemblies

In the present paper, we studied the interaction between n-dodecylammonium alpha-glutamate (GDA)/n-C5H11OH/H2O assemblies and methemoglobin by UV-vis spectroscopy, X-ray diffraction, electron spin resonance (ESR), rheology, and freeze-fractured transmission electron microscopy (FF-TEM). It is found that W/O microemulsion forms at a lower n-pentanol content and O/W microemulsion forms at a lower water content with the addition of methemoglobin. The existence of methemoglobin reduces the hexagonal liquid crystal region, while the lamellar liquid crystal region is little changed in the presence of methemoglobin. Moreover, methemoglobin and GDA/n-C5H11OH/H2O assemblies can affect their structures and properties and the change in behavior is dependent on the content of methemoglobin and the composition and structure of the GDA/n-C5H11OH/H2O system. The relationship among the changes in the structure and properties of GDA/n-C5H11OH/H2O assemblies, the content of methemoglobin, and the composition and structure of GDA/n-C5H11OH/H2O assemblies may provide some important theoretical information for elucidation of the interaction between methemoglobin and blood cell membrane and may also be helpful for the cure of some blood diseases.     

阴离子型微乳液的电导行为及其溶液结构

根据电导测量,研究了属于W/O→双连续→O/W一类微乳液的十二烷基硫酸钠(SDS)/正丁醇/辛烷/水体系的溶液结构.并探讨了表面活性剂离子对微乳液导电行为的贡献,以及表面活性剂与助表面活性剂含量、油含量对微乳液溶液结构的影响.微乳液的导电行为在W/O子区域中主要是由于SDS阴离子和在O/W子区域中是由于Na离子的影响.在双连续区(IZ)中SDS阴离子和Na阳离子都能影响导电行为增加表面活性剂含量有助于形成O/W微乳液,而助表面活性剂和油含量都增加有助于于形成W/O微乳液.     

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。     

Hydrotrope and Hydrotrope-Solubilization Action of Urea in CTAB/n-C5H11OH/H2O System

Urea is found to show the hydrotrope action when the aqueous solubility of surfactant CTAB is enhanced while it will show the hydrotrope-solubilization action when the solubilized amount of n-C₅H₁₁OH in O/W microemulsion and that of water in W/O microemulsion are increased. The mechanism of the hydrotrope-sotubilization action of urea is in fact the increase of the stability of W/O and O/W microemulsion and structural transition from the lamellar liquid crystal phase to the bicontinuous structure.     

Hydrotrope‐Solubilization Action of Urea in CTAB/n‐C5H11‐OH/H2O System

Urea can enhance the aqueous solubility of surfactant CTAB (hexadecyltrimethylammonium bromide) when it shows the hydrotrope action. It will show the hydrotrope‐solubilization action when the solubilized amount of n‐C₅H₁₁OH in O/W microemulsion and that of water in W/O microemulsion are increased. The mechanism of the hydrotrope‐solubilization action of urea is the increase of the stability of W/O and O/W microemulsion and structural transition from the lamellar liquid crystalline phase to the bicontinuous structure.