scholarly journals Surface Tension Measurements with the Drop Profile Analysis Tensiometry—Consideration of the Surfactant Mass Balance in a Single Drop

2017 ◽  
Vol 1 (1) ◽  
pp. 1 ◽  
Author(s):  
Talmira Kairaliyeva ◽  
Nenad Mucic ◽  
Ljiljana Spasojevic ◽  
Sandra Bucko ◽  
Jaroslav Katona ◽  
...  
Keyword(s):  
Surface Tension ◽  
Mass Balance ◽  
Profile Analysis ◽  
Single Drop ◽  
Drop Profile Analysis Tensiometry

scholarly journals Surface Tension and Adsorption Studies by Drop Profile Analysis Tensiometry

2017 ◽  
Vol 20 (6) ◽  
pp. 1225-1241 ◽  
Author(s):  
T. Kairaliyeva ◽  
E. V. Aksenenko ◽  
N. Mucic ◽  
A. V. Makievski ◽  
V. B. Fainerman ◽  
...  
Keyword(s):  
Surface Tension ◽  
Profile Analysis ◽  
Adsorption Studies ◽  
Drop Profile Analysis Tensiometry

scholarly journals Drop Size Dependence of the Apparent Surface Tension of Aqueous Solutions in Hexane Vapor as Studied by Drop Profile Analysis Tensiometry

2020 ◽  
Vol 4 (3) ◽  
pp. 29
Author(s):  
Valentin B. Fainerman ◽  
Volodymyr I. Kovalchuk ◽  
Eugene V. Aksenenko ◽  
Altynay A. Sharipova ◽  
Libero Liggieri ◽  
...  
Keyword(s):  
Surface Tension ◽  
Drop Size ◽  
Profile Analysis ◽  
Pure Water ◽  
Dynamic Surface Tension ◽  
Dynamic Surface ◽  
Hexane Vapor ◽  
Wide Range ◽  
Drop Profile Analysis Tensiometry ◽  
Hexane Phase

Surface tension experiments were performed using the drop profile analysis tensiometry method. The hexane was injected into the measuring cell at certain times before the formation of the solution drop. The influence of the capillary diameter and solution drop size on the measured apparent dynamic surface tension was studied. The amount of hexane transferred from the vapor phase to the drop was estimated. For large pure water drops, it was shown that the ageing of the drop in the hexane vapor during a long time resulted in the formation of a liquid hexane phase covering the drop, but the volume of this phase did not exceed 0.5 mm3. On the contrary, for surfactant solution drops the volume of the hexane phase covering the drop was essentially larger. Experiments with solution drops were performed to measure the surface tension within a wide range of surfactant concentration. It was found that the dependencies of dynamic surface tension on the C13DMPO and C14EO8 solutions concentration exhibit maxima at concentrations of about 1–2 μmol/L for C14EO8 and 2–5 μmol/L for C13DMPO at ageing times of 100 to 1000 s; these maxima were shown to exist also at equilibrium. This phenomenon is presumably ascribed to the competitive character of simultaneous adsorption of hexane and surfactant.

Drop profile analysis tensiometry under highly dynamic conditions

2012 ◽  
Vol 413 ◽  
pp. 292-297 ◽  
Author(s):  
M. Karbaschi ◽  
D. Bastani ◽  
A. Javadi ◽  
V.I. Kovalchuk ◽  
N.M. Kovalchuk ◽  
...  
Keyword(s):  
Profile Analysis ◽  
Dynamic Conditions ◽  
Drop Profile Analysis Tensiometry

scholarly journals Direct Determination of the Distribution Coefficient of Tridecyl Dimethyl Phosphine Oxide between Water and Hexane

2018 ◽  
Vol 2 (3) ◽  
pp. 28 ◽  
Author(s):  
Valentin Fainerman ◽  
Altynay Sharipova ◽  
Saule Aidarova ◽  
Volodymyr Kovalchuk ◽  
Eugene Aksenenko ◽  
...  
Keyword(s):  
Interfacial Tension ◽  
Distribution Coefficient ◽  
Phosphine Oxide ◽  
Profile Analysis ◽  
Water Drop ◽  
Direct Determination ◽  
Interfacial Tensions ◽  
Drop Profile Analysis Tensiometry ◽  
Hexane Solution

Drop profile analysis tensiometry is applied to determine the distribution coefficient of a nonionic surfactant for a water/hexane system. The basic idea is to measure the interfacial tension isotherm in two configurations: a hexane drop immersed in the surfactant aqueous solutions at different bulk concentrations, and a water drop immersed into a hexane solution of the same surfactant. Both types of experiments lead to an isotherm for the equilibrium interfacial tensions with the same slope but with a concentration shift between them. This shift refers exactly to the value of the distribution coefficient.

On the applicability of Drop Profile Analysis Tensiometry at high flow rates using an interface tracking method

2014 ◽  
Vol 441 ◽  
pp. 837-845 ◽  
Author(s):  
Kathrin Dieter-Kissling ◽  
Mohsen Karbaschi ◽  
Holger Marschall ◽  
Aliyar Javadi ◽  
Reinhard Miller ◽  
...  
Keyword(s):  
Profile Analysis ◽  
High Flow ◽  
Interface Tracking ◽  
Flow Rates ◽  
Tracking Method ◽  
Drop Profile Analysis Tensiometry

scholarly journals Size conservation emerges spontaneously in biomolecular condensates formed by scaffolds and surfactant clients

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Ignacio Sanchez-Burgos ◽  
Jerelle A. Joseph ◽  
Rosana Collepardo-Guevara ◽  
Jorge R. Espinosa
Keyword(s):  
Surface Tension ◽  
Droplet Surface ◽  
Surfactant Proteins ◽  
Liquid Droplets ◽  
Single Drop ◽  
Continuous Growth ◽  
Protein Model ◽  
Thermodynamic Mechanism ◽  
Long Timescales ◽  
Over Time

AbstractBiomolecular condensates are liquid-like membraneless compartments that contribute to the spatiotemporal organization of proteins, RNA, and other biomolecules inside cells. Some membraneless compartments, such as nucleoli, are dispersed as different condensates that do not grow beyond a certain size, or do not present coalescence over time. In this work, using a minimal protein model, we show that phase separation of binary mixtures of scaffolds and low-valency clients that can act as surfactants—i.e., that significantly reduce the droplet surface tension—can yield either a single drop or multiple droplets that conserve their sizes on long timescales (herein ‘multidroplet size-conserved’ scenario’), depending on the scaffold to client ratio. Our simulations demonstrate that protein connectivity and condensate surface tension regulate the balance between these two scenarios. The multidroplet size-conserved scenario spontaneously arises at increasing surfactant-to-scaffold concentrations, when the interfacial penalty for creating small liquid droplets is sufficiently reduced by the surfactant proteins that are preferentially located at the interface. In contrast, low surfactant-to-scaffold concentrations enable continuous growth and fusion of droplets without restrictions. Overall, our work proposes one thermodynamic mechanism to help rationalize how size-conserved coexisting condensates can persist inside cells—shedding light on the roles of protein connectivity, binding affinity, and droplet composition in this process.

scholarly journals A rapid method for determining the lowering of tension of exposed water surfaces, with some observations on the surface tension of the sea and of Inland waters

1937 ◽  
Vol 122 (827) ◽  
pp. 134-139 ◽  
Keyword(s):  
Surface Tension ◽  
Salt Water ◽  
Salt Content ◽  
Spreading Coefficient ◽  
Single Drop ◽  
Water Surfaces ◽  
Oily Contamination ◽  
Long Chain ◽  
Hydrocarbon Oil

Ordinary methods of determining surface tension require a certain amount of apparatus and time, and often disturb the surface, thereby altering the tension of a water surface covered by a film of oil. As it was desired to make a number of observations on the amount of invisible contamination on the sea, a method depending on the spreading power of drops of mixtures of different fatty substances has been worked out. An oil will just spread against an amount of contamination which lowers the tension by an amount equal to the spreading force, or “spreading coefficient”, of the oil. Pure long chain hydrocarbon oils do not spread on clean water; if small amounts of substances containing water-attracting groups in the molecule are dissolved in the hydrocarbon, spreading occurs, the spreading force depending on the amount of the second substance with the water-attracting group, in the solution. The theory has been treated particularly thoroughly by Langmuir (1933); this paper is, however, concerned only with the application of solutions of different concentrations of a substance such as dodecyl alcohol, in a pure, rather heavy, hydrocarbon oil, to the determination of the surface tension of either fresh or salt water. It is found that the behaviour of a single drop of each of three or four such solutions, observed for half a minute or so, indicates the value of the surface tension within an accuracy of 1 dyne/cm. Calibration against water surfaces with oily contamination depressing the tension by known amounts is of course required; this is however quickly done, once for all, and it is possible to find substances for the spreading solutions which behave similarly on waters differing widely in acidity and in salt content.

Adsorption of alkanes from the vapour phase on water drops measured by drop profile analysis tensiometry

Soft Matter ◽  
2010 ◽  
Vol 6 (19) ◽  
pp. 4710 ◽  
Author(s):  
A. Javadi ◽  
N. Moradi ◽  
H. Möhwald ◽  
R. Miller
Keyword(s):  
Profile Analysis ◽  
Vapour Phase ◽  
Water Drops ◽  
Drop Profile Analysis Tensiometry
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