scholarly journals Formation of a surfactant adsorption layer on microroughnesses of friction surfaces

2021 ◽  
pp. 38
Author(s):  
Viktor Kosolapov
Keyword(s):  
Friction Surface ◽  
Adsorbed Layer ◽  
Surface Active Substance ◽  
Surfactant Adsorption ◽  
Adsorption Surface ◽  
Surface Active ◽  
Friction Surfaces ◽  
Thermal Oscillations ◽  
Active Substances ◽  
Working Liquid

Formation of an adsorption surface layer on microneralities of friction surfaces. The model of interaction of the molecule of surface-active substance with the microasperity of friction surface has been given. It has been found that the distance of interaction and the thickness of an adsorbed layer of surface-active substances depend on value of a field of an adsorbing surface and energy of thermal oscillations of molecules of surface-active. It has been shown that the distance of interaction and the thickness of an adsorbed layer of surface-active substances decrease at magnification of temperature of working liquid.

The Composition and Characteristics of the Rubber in Hevea Latex

1939 ◽  
Vol 12 (3) ◽  
pp. 448-464 ◽  
Author(s):  
D. F. Twiss ◽  
A. S. Carpenter
Keyword(s):  
Adsorbed Layer ◽  
Protective Layer ◽  
Aqueous Dispersion ◽  
Hydrophilic Surface ◽  
Early Date ◽  
Physical Behavior ◽  
Surface Active ◽  
Protein Components ◽  
The Stability ◽  
Active Substances

Abstract IMPORTANCE OF THE SERUM SUBSTANCES The importance of the non-rubber components of latex, and particularly the protein components, in deciding the behavior towards coagulating agents was recognized at a relatively early date. Indeed, some investigators regarded the coagulating effect as being exerted only by way of the protein, the addition of the coagulants leading initially to its precipitation from solution in the serum, and thereby to the aggregation of the rubber globules. To-day the stability of latex as an aqueous dispersion of rubber globules is still regarded as being dependent on the non-rubber components of the latex. The material actually responsible for its stability, however, is now known to be adsorbed on the surface of the globules, and the physical behavior of the latex globules towards extraneous influences depends on the adsorbed film rather than on the rubber. This is remarkable, as the adsorbed layer, based on the approximation that one gram of protein covers a surface area of 107 cm.2, probably constitutes only 0.6% of the weight of the rubber globules, or thereabouts. The protective layer is not immovably attached, although in fresh latex it is possibly more firmly held than in preserved latex. It should be noted that the adsorbed coating normally represents only a small fraction of the total hydrophilic surface-active substances in the latex, and the stability of latex is less influenced by decrease in the proportion of the non-rubber components than might at first be expected. Latex purified by triply centrifuging shows little, if any, increased tendency to coagulation.

scholarly journals Synthetic Surface-active Substances Abstraction from Water Solutions with Hydrolytic Lignin

2011 ◽  
pp. 105-115
Author(s):  
Keyword(s):  
Acid Medium ◽  
Alkaline Medium ◽  
Active Substance ◽  
Physical Adsorption ◽  
Surface Active Substance ◽  
Chemical Adsorption ◽  
Water Solutions ◽  
Hydrolytic Lignin ◽  
Surface Active ◽  
Active Substances

Regularities of akyltrimethylammoniachloride sorption abstraction from water solutions with hydrolytic lignin have been studied. Two characteristic pH areas of a cation surface-active substance concentration different in the nature of sorbate/sorbent interaction have been singled out. In the acid medium the sorbate’s adsorption by hydrolytic lignin takes place due to physical adsorption. In the subacid and alkaline medium the sorbate/sorbent interaction occurs due to chemical adsorption.

Physical Factors in the Thromboplastic Activity of Phospholipids

1967 ◽  
Vol 17 (03/04) ◽  
pp. 495-507 ◽  
Author(s):  
F Gobbi ◽  
U Barbieri ◽  
E Ascari
Keyword(s):  
Surface Tension ◽  
Sodium Deoxycholate ◽  
Surface Active Substance ◽  
Physical Factors ◽  
Electron Microscopic ◽  
Microscopic Studies ◽  
Thromboplastic Activity ◽  
Surface Active ◽  
Main Factors ◽  
Active Substances

SummaryCephalin suspensions lose their thromboplastic activity when incubated with Tween or with sodium deoxycholate. This effect is proportional to the concentration of the surface-active substance, and to the length of its incubation with the phospholipids.The disappearance of the thromboplastic activity of cephalin treated with surface-tension lowering substances is due to the increased dispersion of the suspensions, as demonstrated by the decrease of their optical density. The activity of sodium deoxycholate is faster than that of Tween.The impaired thromboplastin formation in the presence of phospholipids treated with Tween or with sodium deoxycholate is not due to the formation of inhibitors.Cephalin incubated with surface-tension lowering substances and recovered by ultracentrifugation does not show any thromboplastic activity.Electron-microscopic studies show that incubation with surface-active substances causes the demolition of the structure of phospholipid-particle, on which the thromboplastic activity seems to depend.The size of the particles and the electric surface-charge seem to be among the main factors responsible for the thromboplastic activity of phospholipids.

scholarly journals Effect of Surfactant Compound Sprays on The Rate of Adsorption on Different Target Surfaces

2019 ◽  
Vol 10 ◽  
pp. 1834-1845
Author(s):  
Muhammed Cemal Toraman ◽  
Ali Bayat
Keyword(s):  
Active Substance ◽  
Negative Impact ◽  
Pure Water ◽  
Contact Angles ◽  
Surface Active Substance ◽  
Drop Shape ◽  
Leaf Surfaces ◽  
Surface Active ◽  
Spreading Rates ◽  
Active Substances

The first operation of adsorption on leaf surfaces in pulverization is drop sticking. In the water wettability of the surfaces, the sticking of the drops has a great importance. Drop contact angle, contact height, and contact diameter values in the third and tenth seconds were measured with Drop Shape Analysis 10 device to determine adsorption, spreading, and sticking levels by applying mixtures of ten surface active substances including different contents with pure water to different leaf surfaces. The adsorption and sticking rates of the drops they formed on different leaf surfaces were determined for the time they are obtained from the data obtained in both time periods. Furthermore, the spreading rates of the mixtures prepared by taking into account the change rates during the last seven seconds between these two periods were determined as the sticking rate. Coating shares related to covering rates of different surface active substances with different surface properties on the surface of leaves were evaluated as possible work success according to the adsorption, spreading and sticking levels anticipated in spraying. According to their results on the application surfaces, surface active substances and leaves were evaluated statistically by the SPSS 15 program in terms of their similar properties. It has been found that surface active substance mixtures with sodium carboxymethylcellulose and carboxymethylcellulose contents had the largest drop contact angles and contact heights with the smallest drop contact diameters on the leaf surfaces, and a negative impact on the adsorption performance as they spread very little over seven seconds. It has been determined that drops with surface active substance including trisiloxane + allyloxypolyethyleneglycol and alcoholethoxylate, alkylphenolethoxylate have formed the smallest contact angles, minimum drop heights and largest contact diameters on the surface of the leaves, as well as increased adsorption and sticking by spreading rapidly for seven seconds.

THE INFLUENCE OF SURFACE-ACTIVE SUBSTANCES ON THE OXIDATION OF ETHYLBENZOL, CATALYSIS OF ETHYLBENZOL OXIDATION BY CETYLTRIMETHYLAMMONIA OF BROMIDE IN COMBINATION WITH ACETYLACETANATE OF COBALT

1970 ◽  
Author(s):  
Aybeniz M. Kashkay ◽  
Olga T. Kasaikina ◽  
Zenfira R. Agayeva
Keyword(s):  
Catalytic System ◽  
Active Substance ◽  
Main Product ◽  
Surface Active Substance ◽  
High Rate ◽  
Effective Energy ◽  
Rate Of Absorption ◽  
Surface Active ◽  
Active Substances

There have been studied kinetic objective laws of ethylbenzol oxidation  (RH) and decomposition of a-phenylethyl of hydroperoxide (ROOH) in the presence of cationic surface-active substance-cetyltrimethylammonia of  bromide (CTAB) and bis-(chacetylacetonate) of cobalt (Co(acac)2). The combination  of Co(acac)2 (0,1 mM) with CTAB (1mM) is a hidheffective synergetic catalytic system: the oxidation of RH at 600C is characterized by a high rate of absorption O2 and low stationar concentration of ROOH, the main product of oxidation RH in this system is acetophenon. The effective energy of activization the decomposition of ROOH is Eeff=45,5 kJ/mol, the outlet of radicals-e=0,09. It has been made a supposition that at the oxidation of ethylbenzol by the oxygen from the air, the mecanism of cobalt-bromide catalysis is realized in the system CTAB-Co(acac)2; the concentration of  reagents (ROOH, Co(II), Br) in microagregates CTAB at a small brutto concentrations of the catalysator brings to the rise of the rate of ROOH decomposition and to the fall  of the radicals outlet into volume of oxidating

Sign in / Sign up

Export Citation Format

Share Document