1119-94-4Relevant articles and documents
Properties of Dilute Aqueous Solutions of Double-Chain Surfactants, Alkyldodecyldimethylammonium Bromides with a Change in the Length of the Alkyl Chains
Hiramatsu, Koichi,Kameyama, Keiichi,Ishiguro, Ryo,Mori, Masaki,Hayase, Hisao
, p. 1903 - 1910 (2003)
A series of cationic surfactants, dialkyldimethylammonium bromides with dodecyl as the primary alkyl chain and with methyl, ethyl, propyl, butyl, hexyl, octyl, and decyl as the second alkyl chain, as well as those with symmetric alkyl chains, dioctyl, didecyl and didodecyl ones, were synthesized, and their properties were investigated through measurements of the conductivity and air-liquid surface tension for their aqueous solutions to determine their critical micelle concentrations (cmc) and surface adsorption parameters in the formulation according to a two-dimensional lattice model in the form of the Frumkin equation. The change in cmc revealed that the free energy to transfer from water to the micelle per methylene unit is significantly small for asymmetric double-chain surfactants with a shorter second alkyl chain, and it approaches as elongating the second alkyl to those for the single-chain and symmetric double-chain surfactants. The free energy to transfer to an air-solution interface decreased approximately linearly with the total length of the hydrocarbon chains for all of the species examined. The lattice area for a symmetric double-chain surfactant molecule decreased with the length of its hydrocarbons. In a series of asymmetric ones, it showed a maximum for that with hexyl in its second alkyl.
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Bunton,C.A. et al.
, p. 7393 - 7400 (1970)
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Bruning,Holtzer
, p. 4865 (1961)
GEMINI TYPE SURFACTANT
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Paragraph 0094; 0095, (2017/05/17)
PROBLEM TO BE SOLVED: To provide a gemini type surfactant that has a novel structure and can be synthesized conveniently. SOLUTION: The present invention provides a gemini type surfactant represented by formula (1), where R1-R5 independently represent alkyl, hydroxyalkyl, aryl or the like; R is alkyl, hydroxyalkyl, aryl or the like; Y1 and Y2 independently represent alkylene; n is an integer of 2-4; A- is a counterion; where, R1-R2 and R3-R4 must be the same combination; Z is NR5 or O; R5 is an alkyl group, hydroxyalkyl, aryl or the like. SELECTED DRAWING: None COPYRIGHT: (C)2017,JPOandINPIT
Kinetics of hydrolysis of procaine in aqueous and micellar media
Al-Blewi, Fawzia Faleh,Al-Lohedan, Hamad A.,Rafiquee,Issa, Zuheir A.
, p. 1 - 9 (2013/01/15)
The kinetics of alkaline hydrolysis of procaine under the pseudo-first-order condition ([OH-] a [procaine]) has been carried out. N,N-Diethylaminoethanol and p-aminobenzoate anion were obtained as the hydrolysis product. The rate of hydrolysis was found to be linearly dependent upon [NaOH]. The addition of cationic cetyltrimethylammonium bromide (CTAB), dodecyltrimethylammonium bromide (DDTAB) and tetradecyltrimethylammonium bromide, and anionic sodium dodecyl sulfate (SDS) micelles inhibited the rate of hydrolysis. The maximum inhibitive effect on the reaction rate was observed for SDS micelles, whereas among the cationic surfactants, CTAB inhibited most. The variation in the rate of hydrolysis of procaine in the micellar media is attributed to the orientation of a reactive molecule to the surfactant and the binding constant of procaine with micelles. The rate of hydrolysis of procaine is negligible in DDTAB micelles. The observed results in the presence of cationic micelles were treated on the basis of the pseudophase ion exchange model. The results obtained in the presence of anionic micelles were treated by the pseudophase model, and the various kinetic parameters were determined.
