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Ghosh, Soumen
- Clouding of Binary Mixtures of Surfactants (Triton X-100/Tween-80 and Tween-20/Brij-35) and Binary Surfactant and Polymer Combinations (Brij-56/Poly-Vinyl Alcohol (PVA) and Brij-56/Methyl Cellulose (MC))
Abstract Views :407 |
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Authors
Soumen Ghosh
1,
S. P. Moulik
1
Affiliations
1 Centre for Surface Science, Department of Chemistry, Judavpur University, Calcutta- 700 032, IN
1 Centre for Surface Science, Department of Chemistry, Judavpur University, Calcutta- 700 032, IN
Source
Journal of Surface Science and Technology, Vol 14, No 1-4 (1998), Pagination: 110-119Abstract
The clouding of binary mixtures of Triton X-100/Tween-80 and Tween-20/Brij-35 has been investigated at different compositions. The effects of ionic surfactants, SDS and CTAB on the clouding of the above binary mixtures have been also studied. The clouding of the polymers PVA and MC has been as well examined in presence of the surfactant Brij-56. The phenomenon of clouding (which is essentially a phase separation of the species in solution at a paticular temperature) has been examined in terms of solubilization process to estimate-the associated enthalpy (ΔH0Cl), free energy(ΔG0Cl) and entropy (ΔS0Cl) values by procesing the mole fractional solubility in the light of van't Hoff type equation. The solubilisation and the energetic parameters have been attempted to rationalize and explain on physical-chemical basis.Keywords
Cloud Points, Triton X-100/Tween-80, Tween-20/Brij-35, Brij-56/PVA, Brij-56/MC, Energetics.
- Spectroscopic Study on the Interaction of Medicinal Pigment, Curcumin with Various Surfactants: An Overview
Abstract Views :271 |
PDF Views:1
Authors
Affiliations
1 Centre for Surface Science, Department of Chemistry, Jadavpur University, Kolkata-700 032, IN
1 Centre for Surface Science, Department of Chemistry, Jadavpur University, Kolkata-700 032, IN
Source
Journal of Surface Science and Technology, Vol 28, No 3-4 (2012), Pagination: 179-195Abstract
Curcumin (C21H20O6), a natural antioxidant is the active ingredient of turmeric powder and is well documented for centuries for its medicinal properties owing to the treatment of a variety of inflammatory conditions and other diseases in Indian and Chinese systems of medicine. Curcumin is poorly water soluble. Recently, different micellar systems have been used for the incorporation of curcumin over a wide range of pH values to investigate its solubility and stability with the help of spectroscopic techniques. Curcumin is also used as a probe for the determination of the critical micellar concentrations of different amphiphiles spectroscopically. This pigment behaves in a different way depending on the type of the micelles and pH of the medium. This review summarizes all such investigations.Keywords
Curcumin, Surfactants, UV-VIS Absorption, Fluorescence, Polarization Anisotropy.- Interaction of a Cationic Surfactant with an Oppositely Charged Polymer
Abstract Views :375 |
PDF Views:4
Authors
Soumen Ghosh
1,
Arpan Mal
1,
Tanushree Chakraborty
1,
Gobinda Chandra De
2,
Daniel Gerrard Marangoni
3
Affiliations
1 Centre for Surface Science, Department of Chemistry, Jadavpur University, Kolkata – 700032, West Bengal, IN
2 Department of Chemistry, Alipurduar College, Alipurduar, IN
3 Department of Chemistry, St. Francis Xavier University, Antigonish, Nova Scotia, B2G 2W5, CA
1 Centre for Surface Science, Department of Chemistry, Jadavpur University, Kolkata – 700032, West Bengal, IN
2 Department of Chemistry, Alipurduar College, Alipurduar, IN
3 Department of Chemistry, St. Francis Xavier University, Antigonish, Nova Scotia, B2G 2W5, CA
Source
Journal of Surface Science and Technology, Vol 32, No 3-4 (2016), Pagination: 107–114Abstract
The interactions between the cationic surfactant Dodecyltrimethylammonium Bromide (DTAB) and anionic polymer sodium carboxymethyl cellulose (Na-CMC) in aqueous medium were studied at 300K over different concentrations of Na-CMC by tensiometry, conductometry, viscometry, turbidimetry and fluorimetry. Aggregation of surfactant was attained in two steps, the first being the monomeric adsorption of surfactants on anionic sites of the polymer saturating at lower concentrations of surfactant and the second one being the formation of micelles by surfactants at higher concentrations. Mainly, two types of interactions prevailed throughout namely, electrostatic and hydrophobic interactions. Due to the variation of the interactions depending on the concentrations of polymer, there has been considerable differences in the behavioural pattern of the profiles for the lower concentrations of polymer compared to that of the upper ones.Keywords
Anionic Polymer, Cationic Surfactant, Electrostatic Interaction, Hydrophobic Interaction, Micellization.References
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