Transport properties of alkyltrimethylammonium bromide surfactants in aqueous solutions

Autor:	Artur J.M. Valente, Ana C.F. Ribeiro, M. da G. Miguel, Eduarda F. G. Azevedo, Hugh D. Burrows, Victor M.M. Lobo
Rok vydání:	2004
Předmět:	Aqueous solution Polymers and Plastics Chemistry Capillary action Diffusion Inorganic chemistry Thermodynamics Ion chemistry.chemical_compound Colloid and Surface Chemistry Diffusion process Bromide Critical micelle concentration Materials Chemistry Physical and Theoretical Chemistry
Zdroj:	Colloid and Polymer Science. 283:277-283
ISSN:	1435-1536 0303-402X
DOI:	10.1007/s00396-004-1136-x
Popis:	Differential mutual diffusion coefficients of n-alkyltrimethylammonium bromides [CH3(CH2)n−1N(CH3)3Br, CnTAB] (n=10, 12, 14, 16) have been measured in aqueous solutions at 298.15 K using a conductimetric cell and an automatic apparatus to follow diffusion. The cell is based on an open-ended capillary, and the technique follows the diffusion process by measuring the resistance of a solution inside the capillaries at various times. The electrical conductances of those solutions have also been measured to calculate the critical micellar concentration (cmc). Thermodynamic analysis of the data suggests that the free ion concentration decreases at concentrations above the cmc, in agreement with theoretical predictions. The obtained values of the micellization parameters were used to model the mutual diffusion coefficients of CnTAB aqueous solutions.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::86f1514bdd2793fb0a7c282ece9781dd https://doi.org/10.1007/s00396-004-1136-x Zobrazit plný text záznamu Full text from SpringerLink