Study on Wettability Alteration of Quartz Surface by Surfactants

In order to study the effect of surfactants on wettability of quartz surface, the dynamic contact angles of different surfactants on water-wet and oil-wet quartz surfaces were measured. The experimental results showed that the advancing contact angles of cationic surfactants, anionic surfactants and nonionic surfactants on oil-wet quartz surfaces decrease with the increase of surfactant concentrations; the wettability of water-wet quartz plates remains water-wet after treated by all three kinds of surfactants. Surfactants can reverse the wettability from oil-wet to water-wet at low concentrations; The electrostatic force, hydrophobic force and the attraction between surfactant and polar components of crude oil are the key interactions in the wettability alteration process.

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Mechanistic Study of Wettability Alteration of Quartz Surface Induced by Nonionic Surfactants and Interaction between Crude Oil and Quartz in the Presence of Sodium Chloride Salt

Energy & Fuels ◽

10.1021/ef300472k ◽

2012 ◽

Vol 26 (6) ◽

pp. 3634-3643 ◽

Cited By ~ 66

Author(s):

Achinta Bera ◽

Kissmathulla S ◽

Keka Ojha ◽

T. Kumar ◽

Ajay Mandal

Keyword(s):

Sodium Chloride ◽

Crude Oil ◽

Nonionic Surfactants ◽

Wettability Alteration ◽

Mechanistic Study ◽

Chloride Salt ◽

Quartz Surface

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Effects of surfactants on the twitch tension of frog sartorius muscle

American Journal of Physiology-Legacy Content ◽

10.1152/ajplegacy.1964.207.2.397 ◽

1964 ◽

Vol 207 (2) ◽

pp. 397-401 ◽

Cited By ~ 1

Author(s):

George D. Webb

Keyword(s):

Nonionic Surfactants ◽

Anionic Surfactants ◽

Ionic Surfactants ◽

Sartorius Muscle ◽

Aerosol Ot ◽

Surface Active Agents ◽

Low Concentrations ◽

Surface Active ◽

Isometric Twitch ◽

Frog Sartorius

Many types of cells show permeability increases to ions and to various uncharged molecules when exposed to surface-active agents (surfactants). Nonionic surfactants are less effective than ionic surfactants in increasing permeability and in depolarizing nerve and muscle cells. In the present experiments the strength of isometric twitch responses of directly stimulated frog sartorius muscles was measured. Ionic surfactants generally produced an irreversible decrease in the twitch response, whereas nonionic surfactants (at equimolar concentrations) had little effect. Aerosol OT conditioned muscles so that curare or neostigmine appeared to produce a decrease in the twitch tension of directly stimulated fibers. Possibly the Aerosol OT treatment increased the permeability of the conducting membrane, allowing curare and neostigmine to interact with the acetylcholine system proposed by Nachmansohn. The above observations could be accounted for by increases in permeability caused by the ionic surfactants. Two observations suggested additional actions of ionic surfactants: low concentrations of cetyltrimethylammonium produced a reversible decrease in twitch tension; low concentrations of anionic surfactants caused an increase in contractile tension.

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Phase behavior of cationic and anionic surfactants at low concentrations

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100123878 ◽

1992 ◽

Vol 50 (1) ◽

pp. 694-695

Author(s):

E. Naranjo

Keyword(s):

Phase Behavior ◽

Structural Characterization ◽

Dynamic Systems ◽

Anionic Surfactants ◽

Intermolecular Forces ◽

Stable Form ◽

Surfactant Mixtures ◽

Low Concentrations ◽

Cationic And Anionic Surfactants ◽

General Method

Equilibrium vesicles, those which are the stable form of aggregation and form spontaneously on mixing surfactant with water, have never been demonstrated in single component bilayers and only rarely in lipid or surfactant mixtures. Designing a simple and general method for producing spontaneous and stable vesicles depends on a better understanding of the thermodynamics of aggregation, the interplay of intermolecular forces in surfactants, and an efficient way of doing structural characterization in dynamic systems.

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