scholarly journals Self-defect-healing of silicalite-1 membrane in alkaline aqueous solution with surfactant

2021 ◽  
Author(s):  
Motomu Sakai ◽  
Hayata Hori ◽  
Masahiko Matsukata
Keyword(s):  
Aqueous Solution ◽  
Sodium Hydroxide ◽  
Cetyltrimethylammonium Bromide ◽  
Alkaline Treatment ◽  
Defect Healing ◽  
Alkaline Aqueous Solution

Alkaline-treatment with surfactant was applied to silicalite-1 membrane for defect-healing. By immersion of silicalite-1 membrane into an aqueous solution of sodium hydroxide and cetyltrimethylammonium bromide (CTAB), defects among crystals are...

scholarly journals MICELLAR CATALYZED REACTION IN AQUEOUS GLYCEROL SOLUTIONS AND THE INTERNAL PRESSURE OF THE MEDIUM

2008 ◽  
Vol 16 (16) ◽  
pp. 41-57
Author(s):  
Lavinel G. IONESCU ◽  
Vera Lucia Trindade ◽  
Elizabeth Fatima de Souza
Keyword(s):  
Aqueous Solution ◽  
Internal Pressure ◽  
Sodium Hydroxide ◽  
Alkaline Hydrolysis ◽  
Cetyltrimethylammonium Bromide ◽  
Reaction Medium ◽  
Phosphate Ester ◽  
Cohesive Forces ◽  
Diphenyl Phosphate ◽  
Hydrolysis Of

The experimental results obtained/or the hydrolysis of p-nitrophenyl diphenyl phosphate (NPDPP) in the presence of sodium hydroxide (NaOH), micelles of cetyltrimethylammonium bromide (CTAB), and an aqueous solution of glycerol were analyzed taking into consideration the internal pressure and the cohesive forces of the reaction medium. The effect of glycerol on mice/le formation and also its influence on the internal pressure of the reaction medium are large enough to affect the micellar catalyzed alkaline hydrolysis of the phosphate ester.

Flammability and Thermal Characteristics of Alkaline Aqueous Solution Treated Groundnut Shell–HDPE Composites

2011 ◽  
Vol 24 (6) ◽  
pp. 875-888 ◽  
Author(s):  
E.Y. Ishidi ◽  
I.K. Adamu ◽  
E.G. Kolawale ◽  
K.O. Sunmonu ◽  
M.K. Yakubu
Keyword(s):  
Aqueous Solution ◽  
Mass Loss Rate ◽  
Solution Treatment ◽  
Thermal Characteristics ◽  
Alkaline Treatment ◽  
Cone Calorimetry ◽  
Scanning Calorimetry ◽  
Alkaline Aqueous Solution ◽  
Effective Heat Of Combustion ◽  
Groundnut Shell

The influence of alkaline aqueous solution treatment of groundnut shell–high density polyethylene composites consist of magnesium hydroxide as flame-retardant additives was investigated. FTT daul cone calorimetry and Perkin-Elmer Diamond differential scanning calorimetry (DSC) were used to characterize flammability and thermal properties of the fabricated composites. Quanta 200ESEM was used to investigate the effect of alkaline aqueous solution treatment on the microstructure of the composites. The result obtained revealed that the alkaline treatment of the shell enhanced filler–matrix compatibility. The cone calorimetry result revealed that Mg(OH)2 has good fire retardancy characteristics on the fabricated composites as properties such as heat release rate, effective heat of combustion, mass loss rate, total smoke produced, and specific extinction area were enhanced. DSC results suggested that the additives had little impact on the melting temperature of the composite.

Modification of activated carbon using sodium acetate and its regeneration using sodium hydroxide for the adsorption of copper from aqueous solution

Carbon ◽  
2007 ◽  
Vol 45 (5) ◽  
pp. 1081-1084 ◽  
Author(s):  
Dan Mugisidi ◽  
Aria Ranaldo ◽  
Johny W. Soedarsono ◽  
Muhammad Hikam
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Sodium Hydroxide ◽  
Sodium Acetate

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.

Studies on Grafting Copolymerization of Lactic Acid onto Cornstarch Catalyzed with Sodium Hydroxide

2011 ◽  
Vol 233-235 ◽  
pp. 1906-1910
Author(s):  
Ying Mo Hu ◽  
Qing Ling Wang ◽  
Jian Hua Zhu ◽  
Yang Liu ◽  
Xue Yang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Lactic Acid ◽  
Sodium Hydroxide ◽  
Convenient Method ◽  
Graft Copolymerization ◽  
Good Adhesion ◽  
Acid Copolymer ◽  
Grafting Copolymerization ◽  
Grafting Degree

A convenient method to synthesize starch/lactic acid copolymer was studied in this work. Copolymer of starch graft with lactic acid (LA) was directly prepared by reaction of cornstarch with lactic acid in sodium hydroxide (NaOH) aqueous solution as a catalyst. The product was characterized by IR and WAXD, and the good adhesion between the two components has been observed by SEM. The results showed that the highest grafting degree could reach 33.60% when the graft copolymerization was carried in 0.40 mol·L-1 NaOH aqueous for 9 h at 90°C with the 1: 5~6 ratio of starch and lactic acid.

Behaviour of scleroglucan in aqueous solution containing sodium hydroxide

1987 ◽  
Vol 9 (3) ◽  
pp. 153-157 ◽  
Author(s):  
Shuquin Bo ◽  
Michel Milas ◽  
Marguerite Rinaudo
Keyword(s):  
Aqueous Solution ◽  
Sodium Hydroxide

Synthesis and bioactivity of novel C2-glycosyl triazole derivatives as acetylcholinesterase inhibitors

2017 ◽  
Vol 23 (3) ◽  
pp. 231-236 ◽  
Author(s):  
Long Yin ◽  
Lei Wang ◽  
Xiu-Jian Liu ◽  
Feng-Chang Cheng ◽  
Da-Hua Shi ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Sodium Hydroxide ◽  
Acetylcholinesterase Inhibitors ◽  
Acetylcholinesterase Inhibition ◽  
Inhibition Activity ◽  
Triazole Derivatives ◽  
Inhibitory Activities ◽  
Ellman’S Method

AbstractNew C2-glycosyl triazole derivatives 6a–l were synthesized by cyclization of glycosyl acylthiosemicarbazides 5 in refluxing 3 N sodium hydroxide aqueous solution. Substrates 5 were obtained by the reaction of glycosyl isothiocyanate 3 with various hydrazides. The acetylcholinesterase (AChE) inhibitory activities of compounds 6 were tested by Ellman’s method. Compounds that exhibited over 85% inhibition were subsequently evaluated for the IC50 values. Compound 6f possesses the best acetylcholinesterase-inhibition activity with IC50 of 1.46±0.25 μg/mL.

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