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Electrochemical studies on surfactant-modified cellulose acetate membrane
Kehar Singh1, A K Tiwari, Chandra Shekhar Dwivedi
1Department of Chemistry, D.D.U. Gorakhpur University, 273001, Gorakhpur, India.
Journal of Colloid and Interface Science
|October 7, 2003
Summary
Electrochemical modification of cellulose acetate membranes using sodium dodecyl sulfate (SDS) introduces cation selectivity. This change in membrane potential is linked to surfactant immobilization and concentration below the critical micelle concentration.
Area of Science:
- Materials Science
- Electrochemistry
- Surface Chemistry
Background:
- Cellulose acetate membranes are widely used but often lack specific ion selectivity.
- Surfactants can alter membrane properties, but immobilization mechanisms require further study.
Purpose of the Study:
- To investigate the electrochemical modification of cellulose acetate membranes by immobilizing sodium dodecyl sulfate (SDS).
- To explore the relationship between surfactant immobilization, concentration, and the resulting membrane permselectivity.
Main Methods:
- Membrane potential studies were conducted to assess ion selectivity.
- Surface tension measurements were used to quantify surfactant immobilization on the membrane.
- Varying concentrations of SDS were tested up to its critical micelle concentration.
Main Results:
- Unmodified cellulose acetate membranes showed negligible ion selectivity.
- Modified membranes exhibited cation selectivity, which was dependent on SDS concentration.
- A correlation was established between the degree of surfactant immobilization and the observed permselectivity.
Conclusions:
- Electrochemical immobilization of SDS can induce cation selectivity in cellulose acetate membranes.
- The degree of cation selectivity is tunable by controlling SDS concentration below the critical micelle concentration.
- This study demonstrates a method for functionalizing membranes for selective ion transport.