Results 151 to 160 of about 87,837 (200)

Studies on Interaction of Dodecyltrimethylammonium Bromide with Na- and Al-Montmorillonite

Journal of Colloid and Interface Science, 1997
The adsorption isotherms and adsorption enthalpies of dodecyltrimethylammonium bromide (DDTMAB) on Na- and Al-montmorillonite were determined in the pH range 2-12. The basal spacings of the clays were also studied by X-ray diffraction. Interactions of DDTMAB with the two montmorillonites predominate mostly through cation exchange in the pH range ...
Pei Zhang, Haike Yan, Guanying Yang
exaly   +3 more sources

Thermodynamic studies on the interactions of histone H1 and dodecyltrimethylammonium bromide

Colloids and Surfaces B: Biointerfaces, 1993
Abstract The thermodynamic parameters for the interaction of the cationic detergent dodecyltrimethylammonium bromide (DTAB) with histone H 1 at pH 3.2, 6.4 and 10 have been measured over a wide range of DTAB concentrations by equilibrium dialysis at 27 and 37°C.
A A Moosavi-Movahedi
exaly   +2 more sources

The aqueous catanionic system sodium perfluorooctanoate–dodecyltrimethylammonium bromide at low concentration

Journal of Colloid and Interface Science, 2007
The interaction between sodium perfluorooctanoate (SPFO) and dodecyltrimethylammonium bromide (DTAB) was studied by several methods and it was found strongly synergistic. Above a mole fraction of SPFO in the surfactant mixture (alpha(SPFO))=0.38, the interaction is repulsive and increases with the content of SPFO in both, the overall mixture and ...
Juan M Ruso, Gerardo Prieto, Felix Sarmiento   +2 more
exaly   +3 more sources

Mixed Micelles of Dodecyltrimethylammonium Bromide and Didodecyldimethylammonium Bromide

Langmuir, 1995
Mixed micelles of dodecyltrimethylammonium bromide (DTAB) and didodecyldimethylammonium bromide (DDAB) are investigated with small-angle neutron scattering (SANS). The roughly spherical DTAB micelle elongates, and the fraction of condensed bromide ions increases, as the DDAB-DTAB mixing ratio increases at a constant total surfactant concentration.
K. M. Lusvardi, A. P. Full, E. W. Kaler
openaire   +1 more source

Spectrometric Study on the Interaction of Dodecyltrimethylammonium Bromide with Curcumin

Langmuir, 2011
The interaction between dodecyltrimethylammonium bromide (DTAB) and curcumin has been studied in pH 5.0 sodium phosphate buffer using absorption and fluorescence measurements. With increasing DTAB concentration (C(DTAB)) from 0 to 20 mM, the absorption peak of curcumin at 430 nm, corresponding to the conjugated structure of curcumin, first weakens ...
Dan, Ke, Xiaoyong, Wang, Qianqian, Yang, Yumeng, Niu, Shaohu, Chai, Zhiyun, Chen, Xueqin, An, Weiguo, Shen   +7 more
openaire   +2 more sources

Miscibility of dodecyltrimethylammonium bromide and dodecyltrimethylammonium chloride in surface-adsorbed film and micelle

Colloid & Polymer Science, 1992
Surface tension of aqueous solutions of mixtures of dodecyltrimethylammonium bromide (DTAB) and dodecyltrimethylammonium chloride (DTAC) has been measured and analyzed by using thermodynamic relations. The adsorbed film has been found to contain more DTAB molecules than the solution.
M. Yamanaka, T. Amano, N. Ikeda, M. Aratono, K. Motomura   +4 more
openaire   +1 more source

Electrophoretic properties of dodecyltrimethylammonium bromide micelles in KBr solution

Electrophoresis, 2000
Charge in ionic micelles determines the trends of their stability and their practical applications. Charge can be calculated from zeta potential (zeta) measurements, which, in turn, can be obtained by Doppler microelectrophoresis. In this study, the electrophoretic properties of dodecyltrimethylammonium bromide (DTAB) in KBr aqueous solution (0-6 mM ...
R, Sabaté, M, Gallardo, J, Estelrich
openaire   +2 more sources

Physicochemical Properties of Methylcellulose and Dodecyltrimethylammonium Bromide in Aqueous Medium

The Journal of Physical Chemistry B, 2011
Interactions between uncharged polymers and cationic surfactants are considered weaker than interactions with the anionic analogues. This work describes the binding occurring between methylcellulose (MC) and the cationic surfactant DTAB in aqueous medium.
Marcos A, Villetti, Clara I D, Bica, Irene T S, Garcia, Fabiano V, Pereira, Francieli I, Ziembowicz, Carmen L, Kloster, Cristiano, Giacomelli   +6 more
openaire   +2 more sources

Mixed Micellization of Dodecylethyldimethylammonium Bromide and Dodecyltrimethylammonium Bromide in Aqueous Solution

Langmuir, 2002
Conductivity and steady-state fluorescence measurements have been carried out at 25 °C to study the monomeric and micellar phases of the aqueous solutions of the mixed system constituted by two cationic surfactants, dodecylethyldimethylammonium bromide and dodecyltrimethylammonium bromide.
Elena Junquera, Emilio Aicart
openaire   +1 more source

Enthalpy of micellization II. n-dodecyltrimethylammonium bromide

The Journal of Chemical Thermodynamics, 1970
Abstract The enthalpy of micellization of n-dodecyltrimethylammonium bromide has been measured using a Beckman 190B microcalorimeter at 23, 25, and 30 °C, in water and in sodium bromide solution as a function of surfactant concentration up to 20 times the critical micelle concentration. Dilution of these micellar solutions was found to be endothermic,
L Espada, M.N Jones, G Pilcher
openaire   +1 more source