Behavior of hydrated electrons in micellar solution. Cetyltrimethylammonium bromide-cetylpyridinium chloride mixed micelles

1975 ◽  
Vol 79 (10) ◽  
pp. 956-960 ◽  
Author(s):  
Larry K. Patterson ◽  
M. Graetzel
Keyword(s):  
Micellar Solution ◽  
Cetyltrimethylammonium Bromide ◽  
Mixed Micelles ◽  
Cetylpyridinium Chloride ◽  
Hydrated Electrons

Micellar catalysis of organic reactions. VIII. Kinetic studies of the hydrolysis of 2-acetyloxybenzoic acid (aspirin) in the presence of micelles

1982 ◽  
Vol 35 (7) ◽  
pp. 1357 ◽  
Author(s):  
TJ Broxton
Keyword(s):  
Aqueous Solution ◽  
Cetyltrimethylammonium Bromide ◽  
Cetylpyridinium Chloride ◽  
Kinetic Studies ◽  
Base Catalysis ◽  
Plateau Region ◽  
General Base ◽  
Mechanism Of Hydrolysis ◽  
Ph Range ◽  
Hydrolysis Of

The hydrolysis of 2-acetyloxybenzoic acid in the pH range 6-12 has been studied in the presence of micelles of cetyltrimethylammonium bromide (ctab) and cetylpyridinium chloride (cpc). In the plateau region (pH 6-8) the hydrolysis is inhibited by the presence of micelles, while in the region where the normal BAC2 hydrolysis (pH > 9) occurs the reaction is catalysed by micelles of ctab and cpc. The mechanism of hydrolysis in the plateau region is shown to involve general base catalysis by the adjacent ionized carboxy group both in the presence and absence of micelles. This reaction is inhibited in the presence of micelles because the substrate molecules are solubilized into the micelle and water is less available in this environment than in normal aqueous solution.

scholarly journals Prospects for the use of mixed micellar structures as a template in synthesis of MCM-41-type silicas

2021 ◽  
pp. 79-89
Author(s):  
N.V. Roik ◽  
◽  
L.O. Belyakova ◽  
М.О. Dziazko
Keyword(s):  
Azo Dye ◽  
Cetyltrimethylammonium Bromide ◽  
Mixed Micelles ◽  
Hydrophobic Interactions ◽  
Sol Gel ◽  
Standard Free Energy ◽  
Reaction Medium ◽  
Total Pore Volume ◽  
Methyl Red ◽  
Sol Gel Synthesis

Formation of mixed micelles assisted by cetyltrimethylammonium bromide and methyl red was studied by means of conductometric and spectrophotometric methods. It follows from the analysis of conductometric dependences that the addition of azo dye leads to a decrease in critical micelle concentration of a long-chain quaternary ammonium salt. The respective thermodynamic parameters were calculated. The process of mixed micelles formation was stated to be spontaneous and the solubilization of azo dye by micelles of cetyltrimethylammonium bromide is profitable in terms of energy and accompanied by an increase in degrees of freedom of the system. Based on the data of spectrophotometric study of methyl red solutions in the presence of cetyltrimethylammonium bromide, the values of stability constant, partition coefficient and change in the standard free energy of methyl red distribution between aqueous and micellar medium were calculated. It was found that electrostatic and hydrophobic interactions arising between azo dye and cetyltrimethylammonium bromide molecules cause the orientation of methyl red from the shell towards the center of the micelles. It was shown that mixed micelles can be used as a template in sol-gel synthesis of mesoporous aminosilica of MSM-41 type. The results of low-temperature nitrogen adsorption-desorption and X-ray analysis revealed that the introduction of methyl red as a part of mixed micelles into the reaction medium of sol-gel synthesis causes substantial increase in specific surface area and total pore volume, noticeable reduction of pore diameter, thereby contributing to the formation of silica material with a pronounced long-range ordered mesoporous structure.

scholarly journals Определение коэффициента диффузии растворов метиленового синего в дентине зуба человека с помощью спектроскопии отражения и их антибактериальная активность при лазерном воздействии-=SUP=-*-=/SUP=-

2019 ◽  
Vol 126 (6) ◽  
pp. 832
Author(s):  
А.А. Селифонов ◽  
О.Г. Шаповал ◽  
А.Н. Микеров ◽  
В.В. Тучин
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Laser Radiation ◽  
Micellar Solution ◽  
Cetylpyridinium Chloride ◽  
Suppressive Effect ◽  
Human Tooth ◽  
Solution Studies

The work is devoted to the determination of the diffusion coefficients of methylene blue in pure aqueous solution and in a micellar solution of a cationic surfactant in human tooth dentinal sections in vitro using diffuse reflectance optical spectroscopy and the free diffusion model. The determination of the diffusion coefficient of methylene blue for an aqueous solution is (6.74 ± 1.32) • 10−6 cm2/s and (1.93 ± 0.24) • 10−6 cm2/s for methylene blue in micellar solution. Studies of toxicity in daylight in the absence of laser radiation of methylene blue solutions in water and in solution of cetylpyridinium chloride, as well as the photodynamic effect of laser radiation (662 nm) on cells of Candida albicans, Staphylococcus aureus FDA 209P and Lactobacillus were carried out. The effect of laser radiation has a pronounced suppressive effect on all the studied microbial strains.

Solvation Dynamics of Coumarin 480 in Bile Salt−Cetyltrimethylammonium Bromide (CTAB) and Bile Salt−Tween 80 Mixed Micelles

2003 ◽  
Vol 107 (49) ◽  
pp. 13643-13648 ◽  
Author(s):  
Debdeep Chakrabarty ◽  
Partha Hazra ◽  
Anjan Chakraborty ◽  
Nilmoni Sarkar
Keyword(s):  
Bile Salt ◽  
Cetyltrimethylammonium Bromide ◽  
Mixed Micelles ◽  
Tween 80 ◽  
Solvation Dynamics

Adenosinetriphosphate, calcium and temperature requirements for the final steps of exocytosis in Paramecium cells

1978 ◽  
Vol 32 (1) ◽  
pp. 67-86
Author(s):  
H. Matt ◽  
M. Bilinski ◽  
H. Plattner
Keyword(s):  
Membrane Fusion ◽  
Cetyltrimethylammonium Bromide ◽  
Membrane Lipids ◽  
Energy Requirement ◽  
Gradient Centrifugation ◽  
Cetylpyridinium Chloride ◽  
Cationic Detergents ◽  
Matrix Bound ◽  
Membrane Resealing ◽  
Stretching Process

In Paramecium cells a synchronized discharge of trichocysts (which involves only the final exocytosis steps of membrane fusion, content discharge and membrane resealing) was achieved with ATPase-blockers, Ca2+-ionophores, lipid solvents (including lysolecithin), polyethyleneglycol, anaesthetics (Dibucain) and cationic detergents (cetyltrimethylammonium bromide (CTMAB) and cetylpyridinium chloride (CPC). Only Dibucain—and to some extent cationic detergents—can trigger exocytosis independently of extracellular Ca2+, possibly by mobilizing intracellular Ca2+. The internal free [Ca2+] necessary for exocytosis can be estimated to be greater than 10(−6) to 10(−4) M. Membrane-free trichocyst contents were isolated by density gradient centrifugation; they are converted from the contracted to the expanded state by Dibucain, CTMAB and CPC, and also by exogenous ATPase (Apyrase). Thus, it is possible to de-couple the discharge (stretching) process from membrane-related phenomena. Since only the latter are inhibited by low temperature (0 degrees C), membrane lipids probably have to be in a fluid state for exocytosis to occur. At least 2 steps appear to be involved: when membrane fusion is initiated, an independent matrix-bound system is activated for the synchronized stretching process. The energy requirement for one discharge event is estimated to be about 14 X 10(6) ATP molecules.

Stability of mixed micelles of cetylpyridinium chloride and linear primary alkylamines

2007 ◽  
Vol 309 (1-3) ◽  
pp. 216-223 ◽  
Author(s):  
Luis García-Río ◽  
José R. Leis ◽  
Juan C. Mejuto ◽  
Victor Mosquera ◽  
Pedro Rodríguez-Dafonte
Keyword(s):  
Mixed Micelles ◽  
Cetylpyridinium Chloride

Mixed micelles of cetyltrimethylammonium bromide and poly(ethylene glycol)-600 monolaurate as catalysts of polyethylenimine phosphorylation in chloroform

2006 ◽  
Vol 55 (8) ◽  
pp. 1411-1418 ◽  
Author(s):  
G. A. Gainanova ◽  
E. P. Zhil’tsova ◽  
L. A. Kudryavtseva ◽  
S. V. Kharlamov ◽  
Sh. K. Latypov ◽  
...  
Keyword(s):  
Ethylene Glycol ◽  
Cetyltrimethylammonium Bromide ◽  
Mixed Micelles ◽  
Poly Ethylene Glycol ◽  
Poly Ethylene
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