NDLI: Adsorption Studies of Non-Ionic Surfactants at Different Vegetable Oil-Water Interfaces

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Adsorption Studies of Non-Ionic Surfactants at Different Vegetable Oil-Water Interfaces

Content Provider	Semantic Scholar
Author	Hameed, Rao A. Rabbani, Mehboob-E Shah, Syed Nisar Hussain Khan, Shujaat Yameen, Muhammad Arfat Asad, Muhammad Murtaza, G.
Copyright Year	2012
Abstract	SUMMARY . The adsorption studies of non-ionic surfactants (tween 20, tween 40 and tween 80) were con-ducted at olive oil-water, sunflower oil-water and corn oil-water interfaces by ring detachment methodwith a du Nouy Tensiometer at 20 °C. A decrease in interfacial tension with an increase in surfactant con-centration was observed at all the oil-water interfaces under investigation. Surface excess was calculatedfrom Gibb's equation while area per molecule was computed from surface excess. Surface pressure-areacurves were plotted to study the states of films formed. On close examination of π-A graphs, it was indicat-ed that all the graphs have three distinct parts. The extreme left portion (a) of the graphs represents con-densed state, called solid film region, the curved region (b) of the π-A graphs corresponds to liquid film re-gion, while the gaseous film region (c) is indicated by the shallow right hand part of the curves. The solidfilm region was more prominent in corn oil-water system while a more distinct gaseous film region was ob-served in olive oil-water system than in other oil-water systems studied. However, liquid film region wasobserved in all the systems investigated. The observed difference in the behaviour of surfactants at differ-ent vegetable oil-water interfaces could be attributed to the difference in types of interacting forces be-tween the surfactant molecules and various vegetable oil phases.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://sedici.unlp.edu.ar/bitstream/handle/10915/25698/Resumen.pdf?sequence=1
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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