共查询到17条相似文献,搜索用时 203 毫秒
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报道了苯甲醇对CTAB/KBr胶束体系粘度的影响,利用^1H NMR法研究了苯甲醇在CTAB胶束中的增溶位置。结果表明,在KBr盐溶液中,随着苯甲醇的加入,0.01mol/L CTAB胶束体系的粘度增大至最大值。 相似文献
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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. 相似文献
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本文采用荧光探针、ESR自旋标记和NMR技术研究了SPFO-CTAB混合胶束的微环境性质.发现在CTAB溶液中添加SPFO,使胶束内芯的微粘度增大,微环境的极性(反映在介电常数上)减弱.由此推测SPFO插入了CTAB胶束的栅状层并与之形成混合胶束. 相似文献
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Wei-Can Zhang Gan-Zuo Li Jian-Hai Mu Li-Qiang Zheng Hao-Jun Liang Chi Wu 《Journal of Dispersion Science and Technology》2013,34(5):605-613
ABSTRACT The effect of benzyl alcohol on the micellar size and shape of CTAB in KBr solution has been investigated by means of viscosity, LLS (laser light scattering), and NMR measurements. The surfactant CTAB (cetyltrimethylammonium bromide) and KBr content are kept constant at 0.01 mol.L?1 and O.l?1 mol.. The data from the various techniques are quantitatively in agreement. The viscosity of 0.01 mol.L?1 CTAB/ 0.01mol.L?1 KBr micellar system has a marked maximum at benzyl alcohol content 0.6%(v/v), where the size of rod micelles are largest. The results from 'H-NMR spectra of CTAB molecules show that before the maximum viscosity, benzyl alcohol is located in the interfacial region of CTAB micelles in the presence of KBr salt. If more benzyl alcohol is added, it starts solubilizing in the palisades of the micelles. 相似文献
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Xiao-ming Chen 《化学物理学报(中文版)》2011,24(4):484-488
Cetyltrimethylammonium bromide (CTAB)/potassium bromide (KBr) micellar system has been used as a viscosity probe to study the inclusion complexation between β-cyclodextrin (β-CD) and CTAB. Viscosity measurements show that the inclusion complexation between β-CD and CTAB may cause the breakdown of CTAB/KBr wormlike micelles, resulting in the decrease of the solution viscosity. The viscosity minimum at Cβ-CD/CCTAB=2 indicate the molecular ratio of host molecule to guest molecule is 2:1 in the β-CD/CTAB inclusion complex. 相似文献
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Dharmesh Varade Carlos Rodríguez-Abreu José Gregorio Delgado Kenji Aramaki 《Colloid and polymer science》2007,285(15):1741-1747
The rheological and mass transport properties of phenol in micellar solutions of hexadecyltrimethylammonium bromide (CTAB)
were studied by rheometry and spectrophotometry. The presence of phenol located between headgroups of the CTAB diminishes
the repulsive forces between the cationic groups and induces a sharp increase in viscosity that is attributed to the one-dimensional
micellar growth favoring the formation of worm-like micelles. It is found that the mass transfer of phenol between two immiscible
phases is significantly retarded by the presence of CTAB. The transfer is particularly slow when the diffusion takes place
from a surfactant solution phase to an organic phase. This behavior is attributed to the phenol–surfactant interaction that
leads to micellar growth and viscoelastic behavior. However, at elevated temperature, viscosity decreases and mass transfer
increases. This particular rheological behavior offers the possibility of regulating the mass transfer, which might be interesting
for applications. 相似文献
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CTAB/CnH2n+1OH/H2O体系的热力学和电化学性质 总被引:3,自引:0,他引:3
微乳液通常由表面活性剂、助表面活性剂、油和水等四组分自发生成,注意到表面活性剂、助表面活性剂和水三组分体系与上述四组分体系在相行为及其物理化学性质上具有相似性,为方便起见,人们通常以此三组分体系为对象,研究四组分体系微乳液的有关性质,并亦将其称为微乳液[1].另一方面,助表面活性剂一般为具有中等碳链长度的直链饱和一元醇,但实验已经发现,即使是像乙醇这样的短链醇,也能以相当数量存在于胶束栅栏中形成膜相[2],或存在于两亲双层中形成层状液晶[3].本文以热力学方法与无探针循环伏安法研究了直链饱和一元醇对CTAB/醇(C2H… 相似文献
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Tao Wan Denghui Wang Junyan Hu Zhiling Zhou Haibo Zhang Daolu Bu 《Journal of Dispersion Science and Technology》2014,35(1):7-13
The effect of the addition of sodium 4-styrenesulfonate (SSS) and KNO3 as well as temperature and shear rate on the structural transition of aqueous micellar solutions of the cationic surfactant cetyl trimethyl ammonium bromide (CTAB) was studied by viscosity. The effect of hydrocarbons on viscoelastic CTAB solutions was also examined. Possible mechanism for formation of CTAB wormlike micelles in the presence of sodium 4-styrenesulfonate (SSS) and KNO3 was discussed. The rapid increase in the apparent viscosity of CTAB solutions on the addition of SSS and KNO3 was due to the transition in micellar shape from spheres to wormlike ones. The rheological properties of CTAB solutions fit Maxwell model at low shear frequency. AFM image indicated a structure of transient network of CTAB/SSS/KNO3/H2O solution. 相似文献
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Side-chain-controlled H- and J-aggregation of amphiphilic porphyrins in CTAB micelles 总被引:1,自引:0,他引:1
Guo L 《Journal of colloid and interface science》2008,322(1):281-286
The aggregation behavior of a series of amphiphilic 4-hydroxyphenyl porphyrins with one (P1), two (P2) and three (P3) hexadecyl side chains in cetyltrimethylammonium bromide (CTAB) micelles has been studied by means of UV-vis and fluorescence spectra. It was found that the number of hexadecyl side chains not only controls the H- and J-aggregation of the porphyrins in CTAB micelles, but also influences the aggregation concentration and tendency. With increasing porphyrin concentration, P1 and P2 form H-aggregates in CTAB micelles, while P3 forms J-aggregates. Porphyrins with more hexadecyl side chains tend to form aggregates more easily and at lower concentrations in CTAB micellar solutions. 相似文献