Defective Lamellar Phases and Micellar Polymorphism in Mixtures of Glycerol Monooleate and Cetyltrimethylammonium Bromide in Aqueous Solution

Langmuir ◽  
1998 ◽  
Vol 14 (18) ◽  
pp. 4987-4996 ◽  
Author(s):  
J. Gustafsson ◽  
G. Orädd ◽  
M. Nyden ◽  
P. Hansson ◽  
M. Almgren
Keyword(s):  
Aqueous Solution ◽  
Cetyltrimethylammonium Bromide ◽  
Lamellar Phases ◽  
Glycerol Monooleate

Influence of Surface Roughness on Cetyltrimethylammonium Bromide Adsorption from Aqueous Solution

Langmuir ◽  
2011 ◽  
Vol 27 (10) ◽  
pp. 6091-6098 ◽  
Author(s):  
Shuqing Wu ◽  
Liu Shi ◽  
Lucas B. Garfield ◽  
Rico F. Tabor ◽  
Alberto Striolo ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Surface Roughness ◽  
Cetyltrimethylammonium Bromide

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.

A Study of the Interaction of Methyl β-CD with Cetyltrimethylammonium Bromide in Aqueous Solution

1997 ◽  
Vol 13 (08) ◽  
pp. 747-751
Author(s):  
Lin Li-Rong ◽  
◽  
Jiang Yun-Bao ◽  
Huang Xian-Zhi ◽  
Chen Guo-Zhen
Keyword(s):  
Aqueous Solution ◽  
Cetyltrimethylammonium Bromide

scholarly journals Phenol Red Adsorption from Aqueous Solution on the Modified Bentonite

2020 ◽  
Vol 2020 ◽  
pp. 1-14
Author(s):  
Nguyen Le My Linh ◽  
Tran Duong ◽  
Hoang Van Duc ◽  
Nguyen Thi Anh Thu ◽  
Pham Khac Lieu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Cetyltrimethylammonium Bromide ◽  
Nitrogen Adsorption ◽  
Isotherm Models ◽  
Phenol Red ◽  
Order Kinetic ◽  
Equilibrium Data ◽  
Order Kinetic Model ◽  
Red Dye ◽  
Adsorption Desorption

In the present work, the modified bentonites were prepared by the modification of bentonite with cetyltrimethylammonium bromide (CTAB), both cetyltrimethylammonium bromide and hydroxy-Fe cations and both cetyltrimethylammonium bromide and hydroxy-Al cations. X-ray diffraction (XRD), thermal analysis (TG-DTA), infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and nitrogen adsorption/desorption isotherms were utilized to characterize the resultant modified bentonites. The modified bentonites were employed for the removal of phenol red dye from aqueous solution. Phenol red adsorption agreed well with the pseudo-second-order kinetic model. The equilibrium data were analyzed on the basis of various adsorption isotherm models, namely, Langmuir, Freundlich, and Dubinin‒Radushkevich models. The highest monolayer adsorption capacity of phenol red at 30°C derived from the Langmuir equation was 166.7 mg·g−1, 125.0 mg·g−1, and 100.0 mg·g−1 for CTAB‒bentonite, Al‒CTAB‒bentonite, and Fe‒CTAB‒bentonite, respectively. Different thermodynamic parameters were calculated, and it was concluded that the adsorption was spontaneous (∆G° < 0) and endothermic (∆H° > 0), with increased entropy (∆S° > 0) in all the investigated temperature ranges.

Mesostructured Zirconium Oxide

1996 ◽  
Vol 431 ◽  
Author(s):  
P. Liu ◽  
J. S. Reddy ◽  
A. Adnot ◽  
A. Sayari
Keyword(s):  
Zirconium Oxide ◽  
Cetyltrimethylammonium Bromide ◽  
Potassium Phosphate ◽  
Primary Amines ◽  
Swelling Agent ◽  
Synthesis Parameters ◽  
Lamellar Phases ◽  
Quaternary Ammonium Surfactants ◽  
Synthesized Materials ◽  
Long Chain

AbstractThe supramolecular templating technique was used to synthesize both hexagonal (Hx- ZrO2) and lamellar (L-ZrO2) phases of zirconium oxide. Under the conditions used in this work, the use of long chain primary amines and quaternary ammonium surfactants resulted in the exclusive formation of lamellar and hexagonal phases, respectively. The use of long chain cetyldimethylamine afforded a mixture of a hexagonal and a lamellar phases. Effects of synthesis parameters such as the ZrO2/surfactant ratio, ZrO2/water ratio, the nature of surfactant, the crystallization temperature and time on the formation of mesostructured ZrO2 were also studied. Addition of 1,3,5-trimethylbenzene (TMB) as a swelling agent led, in the presence of cetyltrimethylammonium bromide, to the formation of a lamellar phase rather than to pore enlargement. These materials were characterized by XRD, FTIR, XPS and EDX techniques. Regardless of their structure, the as-synthesized materials collapsed upon calcination. Treatment with monobasic potassium phosphate followed by calcination at 350 °C led to the formation of a stable porous Zr–P oxide with a surface area as high as 540 m2/g.

Adsorption of cetyltrimethylammonium bromide on carbon black from aqueous solution

Carbon ◽  
1998 ◽  
Vol 36 (7-8) ◽  
pp. 1207-1212 ◽  
Author(s):  
M. Bele ◽  
A. Kodre ◽  
I. Arčon ◽  
J. Grdadolnik ◽  
S. Pejovnik ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Carbon Black ◽  
Cetyltrimethylammonium Bromide
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