Properties and composition of surface films formed on steel in CO2—aqueous solutions

1989 ◽  
Vol 34 (2) ◽  
pp. 273-279 ◽  
Author(s):  
T. Våland ◽  
P.A. Sjøwall
Keyword(s):  
Aqueous Solutions ◽  
Surface Films

scholarly journals The structure of surface films. Part XVIII. ─The effect of alkalinity in the underlying solution on films of fatty acids

1933 ◽  
Vol 142 (847) ◽  
pp. 401-415 ◽  
Keyword(s):  
Fatty Acids ◽  
Acid Solution ◽  
Aqueous Solutions ◽  
Complete Solution ◽  
Alkaline Solutions ◽  
Carboxyl Group ◽  
Surface Films ◽  
Electrolytic Dissociation ◽  
End Groups ◽  
Monomolecular Films

Historical . It has been known for some time that extensive changes occur in monomolecular films of fatty acids on aqueous solutions, as the alkalinity or acidity is varied. These changes are of at least tow kinds; changes in the packing of the molecules in the coherent types of film, and changes in the lateral adhesion between molecules have already been described. Thus Adam found changes in the packing of the molecules in the condensed films on changing from neutral to acid solution; and also a change from condensed to gaseous or vapour expanded films, on changing from natural to strongly alkaline solutions. The second of those effects was considered to be due to a decrease in the lateral adhesion between the molecules, caused by the development of similar electric charges on the end groups, through electrolytic dissociation of the carboxyl group on alkaline solutions. On alkaline solutions, it has previously been noted that the films contract spontaneously; Adam called this "solution," but did not examine it in detail; Lyons and Rideal believed it to be not a complete solution, but the formation of a bimolecular layer two molecules thick; Zocher and Stiebel, by ultramicroscopic examintion, concluded that this disappearance of the film was due to a partial collapse into thick, localized aggregates, not into a uniform bimolecular film.

scholarly journals The structure of surface films. Part XVII.—γ hydroxy-stearic acid and its lactone

1933 ◽  
Vol 140 (840) ◽  
pp. 223-226 ◽  
Keyword(s):  
Stearic Acid ◽  
Aqueous Solutions ◽  
Surface Pressure ◽  
Surface Films ◽  
Hydroxy Stearic Acid ◽  
Monomolecular Films ◽  
Made In

This paper describes observations, mostly made in 1924 and not hitherto published in detail,* on the surface pressure of γ hydroxy-stearic acid (I) and its lactone (II) spread as monomolecular films on aqueous solutions. CH3 3 CH3 3 (CH 2 ) 13 (CH 2 ) 13 CHOH CH CH 2 CH 2 CH 2 O COOH CH 2 – CO I II Most of the measurements were made with the modification of Langmuir’s apparatus described in Parts I and II of this series of papers,† in which jets of air prevent the film passing the ends of the float. A few confirmatory observations have been made since, with the apparatus of Adam and Jessop, in which thin metallic ribbons block these gaps. The acid and lactone were kindly given me by Dr. P. W. Clutterbuck, of Manchester University.

scholarly journals The structure of surface films. Part XV.—Amines

1930 ◽  
Vol 126 (802) ◽  
pp. 526-541 ◽  
Keyword(s):  
Aqueous Solutions ◽  
Surface Films ◽  
Buffer Solutions ◽  
Hydrocarbon Chains ◽  
Long Chain

This paper describes observations on monomolecular surface films of the long chain amines, C n H 2n+1 NH 2 , on aqueous solutions of different acidities. The lengths of the hydrocarbon chains were varied from 14 to 20 carbon atoms, five members of the series (with 14, 16, 17, 18 and 20 carbons) being used. The acidity of the solutions was varied from N/10 alkali to N/10 acid, using buffered solutions for most of the intermediate acidities. The dilution of the buffer solutions was also varied in some instances. The results indicate that the acidity of the solution is by no means the only factor affecting the structure of the films, and indeed the P H of the solution, on the acid side of neutrality, seems to be of little importance ; but the structure of the films depends very much indeed on the nature of the anions present in the buffer solutions. Entirely different results are obtained on phthalate and acetate buffers, and there is little doubt that the films measured on solutions on the acid side of neutrality are not those of the amines at all, but of their salts with whatever acid radicals are present in the water.

scholarly journals Anodic Polarization Behavior and Surface Films of CVD-SiC in Aqueous Solutions

1993 ◽  
Vol 57 (10) ◽  
pp. 1166-1173
Author(s):  
Daisuke Tanaka ◽  
Noboru Akao ◽  
Nobuyoshi Hara ◽  
Katsuhisa Sugimoto
Keyword(s):  
Aqueous Solutions ◽  
Anodic Polarization ◽  
Surface Films ◽  
Polarization Behavior
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