Properties of monolayers at the air/water interface. Part 2.—Effect of temperature on the double layer and water dipole contributions to the surface potential of sodium octadecyl sulphate

1973 ◽  
Vol 69 (0) ◽  
pp. 500 ◽  
Author(s):  
J. Mingins ◽  
B. A. Pethica
Keyword(s):  
Double Layer ◽  
Surface Potential ◽  
Effect Of Temperature ◽  
Water Interface ◽  
Air Water Interface ◽  
Water Dipole

scholarly journals Surface Potential of the Air/Water Interface

2020 ◽  
Vol 69 (6) ◽  
pp. 519-528 ◽  
Author(s):  
Cuong V. Nguyen ◽  
Hiromichi Nakahara ◽  
Chi M. Phan
Keyword(s):  
Surface Potential ◽  
Water Interface ◽  
Air Water Interface

scholarly journals Surface Potential of MIBC at Air/Water Interface: a Molecular Dynamics Study

2012 ◽  
Vol 10 (0) ◽  
pp. 437-440 ◽  
Author(s):  
C. M. Phan ◽  
H. Nakahara ◽  
O. Shibata ◽  
Y. Moroi ◽  
C. V. Nguyen ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Surface Potential ◽  
Water Interface ◽  
Air Water Interface

The influence of electrolytes on gaseous monolayers II. Ionized films

1955 ◽  
Vol 232 (1189) ◽  
pp. 159-172 ◽  
Keyword(s):  
Surface Potential ◽  
Quaternary Ammonium ◽  
Alkyl Chain ◽  
Electrolyte Concentration ◽  
Ammonium Ion ◽  
Water Interface ◽  
Ammonium Halides ◽  
Air Water Interface ◽  
Good Agreement ◽  
The Ideal

An equation of state for a charged monolayer spread on an aqueous solution of a 1:1 electrolyte at 20°C in the absence of cohesive interactions has been derived, namely II = 2 kT / A-A o + 6.10√ c cosh sinh -1 133/ A √ c 6.10√ c . It has been found to apply to soluble charged films at hydrocarbon/water interfaces. In the case of insoluble monolayers of both alkyl quaternary ammonium halides and sodium alkyl sulphates at the hydrocarbon/water interface there is evidence of considerable ( ~50 %) ion-pair association, and this appears to be even further enhanced at the air/water interface at least for sulphate films. Surface potentials, measured by both the radioactive electrode and vibrating plate condenser techniques have been found to be in good agreement. The surface potential of sulphate monolayers in contrast to the ideal behaviour of quaternary ammonium films has been found to be dependent not only on the electrolyte concentration and film area but also on the nature of the interface, the nature of the substrate and at the air/water interface on the chain length. This has been attributed to a reorientation of the film molecules at the interface. Differences in the surface potential behaviour of sulphate and quaternary ammonium films are explained by suggesting that whereas with the sulphate film restricted rotation about the C—O bond can lead to different configurations of the sulphate ion with respect to the alkyl chain, only one configuration is possible for the symmetrical quaternary ammonium ion. Surface potential evidence indicates that contrary to what has been suggested previously, sulphate monolayers are completely dissociated in the acid-base sense.

Reactions of Retinals in a Model Membrane System

1973 ◽  
Vol 28 (3-4) ◽  
pp. 157-164 ◽  
Author(s):  
Seymour S. Brody
Keyword(s):  
Quantum Yield ◽  
Surface Potential ◽  
Membrane System ◽  
Model Membrane ◽  
Water Interface ◽  
Interface Area ◽  
Air Water Interface ◽  
Monomolecular Films

Monomolecular films of 9-cis, 11-cis, 13-cis and all-trans retinal were formed at an air-water interface. Area/molecule and surface potential were measured before, during and after illumination. The initial quantum yield of the photoisomerization of 9-cis retinal was 0.25. Irradiation of a retinal monolayer resulted in 30 to 60 mVolt changes in surface potential. Complexation of retinals with lysine and cysteine were studied.

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