Article

Adsorption and electrochemical studies on surfactant modified cellulose acetate membranes

Colloid Journal (Impact Factor: 0.63). 01/2008; 70(1):101-104. DOI: 10.1134/S1061933X08010158

ABSTRACT The possibility of the modification of a cellulose acetate membrane upon adsorption of ionic surfactants, cetyl pyridinium
chloride and sodium dodecyl sulphate has been investigated on the basis of membrane potential studies. For the estimation
of the extent of adsorption, surface tension measurements were carried out in the presence and absence of cellulose acetate
membrane using surfactant solutions of variable compositions. The results have also been used for the characterization of
the thermodynamic equilibrium, which the membrane surfactant system attains upon surfactant adsorption, in terms of the immobilization
constant.

0 Bookmarks
 · 
107 Views
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: This book is the premier text on the properties and applications of surfactants. The third edition is completely updated and revised, including new information on gemini surfactants (a new type of powerful surfactant), superspreading (or superwetting) by aqueous surfactant solutions of highly hydrophobic surfaces (important in agricultural applications), and dynamic surface tension (an important interfacial property not covered in the first two editions). * Clearly explains the mechanisms by which surfactants operate in interfacial processes * Uses a minimum of mathematics in explanation of topics, making it easy-to-understand and very user-friendly * Problems are included at the end of each chapter * Includes many tables of data as reference that are not compiled elsewhere * Milton J Rosen is an expert in the field of Surfactant research
    Surfactants and Interfacial Phenomena, 3rd Edition, by Milton J. Rosen, pp. 464. ISBN 0-471-47818-0. Wiley-VCH , July 2004. 07/2004;
  • [Show abstract] [Hide abstract]
    ABSTRACT: The present study concerns formation and characterization of cholesterol liquid membranes. Dowex-50 and cellulose acetate films are used for supporting the liquid membrane. Liquid membrane generation was ascertained by measurement of alterations in the resistivity of the substrate films due to the accumulation of cholesterol moieties in the interfacial region. Membrane potential measurements were carried out to derive ionic transport numbers in the membrane phase for the estimation of permselectivity and fixed charge densities. The variation of these membrane parameters with pH and the concentration of sodium chloride solutions used was also investigated.
    Journal of Membrane Science. 01/1987;
  • [Show abstract] [Hide abstract]
    ABSTRACT: Membrane potentials and apparent transport numbers of the cation are reported for cured cellulose acetate membranes bounded by HCl, NaCl, KCl and MgCl2 solutions, using Ag/AgCl electrodes and a flow-cell method. Membranes cured at 70°, 80° and 90° are used. Bounding solution concentrations vary from 0.005 to 0.05 M at the high concentration side (bounding the dense side of the membrane), and are kept constant at 0.002 M for the low concentration solution. In the KCl 90° membrane case the low concentration solution is varied as well, from 0.0001 to 0.002 M. Results show that cured cellulose acetate membranes are permselective towards univalent cations. This is interpreted as resulting from a low cation-exchange capacity of the dense layer of the cured membrane. The permselectivity increases with increased curing temperature. Addition of a non-electrolyte to the low concentration side reverses the osmotic flow and leads to higher apparent transport numbers of the cation. It is concluded that diffusion in small pores contributes significantly to the transport of ionic solutes through uncompacted membranes.
    Desalination. 01/1974; 15(2):213-224.