Adsorption and Desorption of Polymer/Surfactant Mixtures at Solid−Liquid Interfaces:  Substitution Experiments

Langmuir ◽  
2004 ◽  
Vol 20 (19) ◽  
pp. 8114-8123 ◽  
Author(s):  
D. Zimin ◽  
V. S. J. Craig ◽  
W. Kunz
Keyword(s):  
Liquid Interfaces ◽  
Surfactant Mixtures ◽  
Adsorption And Desorption ◽  
Solid Liquid ◽  
Polymer Surfactant

Temperature-Driven Adsorption and Desorption of Proteins at Solid–Liquid Interfaces

Langmuir ◽  
2014 ◽  
Vol 30 (8) ◽  
pp. 2077-2083 ◽  
Author(s):  
Irena Kiesel ◽  
Michael Paulus ◽  
Julia Nase ◽  
Sebastian Tiemeyer ◽  
Christian Sternemann ◽  
...  
Keyword(s):  
Liquid Interfaces ◽  
Adsorption And Desorption ◽  
Solid Liquid

scholarly journals Adsorption of Mixtures of a Pegylated Lipid with Anionic and Zwitterionic Surfactants at Solid/Liquid

2020 ◽  
Vol 4 (4) ◽  
pp. 47
Author(s):  
Sara Llamas ◽  
Eduardo Guzmán ◽  
Francisco Ortega ◽  
Ramón G. Rubio
Keyword(s):  
Hydrophobic Interactions ◽  
Deposition Process ◽  
Surfactant Mixtures ◽  
Zwitterionic Surfactants ◽  
Charged Surfaces ◽  
Surfactant Aggregates ◽  
Ternary Polymer ◽  
Solid Liquid ◽  
Polymer Surfactant ◽  
The Impact

This work explores the association of a pegylated lipid (DSPE-PEG) with different anionic and zwitterionic surfactants (pseudo-binary and pseudo-ternary polymer+ surfactant mixtures), and the adsorption of the polymer + surfactant aggregates onto negatively charged surfaces, with a surface charge density similar to that existing on the damaged hair epicuticle. Dynamic light scattering and zeta potential measurements shows that, in solution, the polymer + surfactant association results from an intricate balance between electrostatic and hydrophobic interactions, which leads to the formation of at least two different types of micellar-like polymer + surfactant aggregates. The structure and physicochemical properties of such aggregates were found strongly dependent on the specific nature and concentration of the surfactant. The adsorption of the polymer + surfactant aggregates onto negatively charged surface was studied using a set of surface-sensitive techniques (quartz crystal microbalance with dissipation monitoring, ellipsometry and Atomic Force Microscopy), which allows obtaining information about the adsorbed amount, the water content of the layers and the topography of the obtained films. Ion-dipole interactions between the negative charges of the surface and the oxyethylene groups of the polymer + surfactant aggregates appear as the main driving force of the deposition process. This is strongly dependent on the surfactant nature and its concentration, with the impact of the latter on the adsorption being especially critical when anionic surfactant are incorporated within the aggregates. This study opens important perspectives for modulating the deposition of a poorly interacting polymer onto negatively charged surfaces, which can impact in the fabrication on different aspects with technological and industrial interest.

scholarly journals A Chemical Potential Equation for Modeling Triboelectrochemical Reactions on Solid–Liquid Interfaces

2021 ◽  
Vol 9 ◽  
Author(s):  
Chenxu Liu ◽  
Yu Tian ◽  
Yonggang Meng
Keyword(s):  
Electric Field ◽  
Chemical Reactions ◽  
Boundary Lubrication ◽  
Chemical Potential ◽  
Liquid Interface ◽  
Liquid Interfaces ◽  
Potential Equation ◽  
Adsorption And Desorption ◽  
Solid Liquid Interface ◽  
Solid Liquid

Triboelectrochemical reactions occur on solid–liquid interfaces in wide range of applications when an electric field strong enough and a frictional stress high enough are simultaneously imposed on the interfaces. A characteristic of triboelectrochemical reactions is that not only the thermal energy but also the electrical and mechanical energies can activate, assist, or mitigate the solid–liquid interface chemical reactions, the products of which affect electrical and tribological behavior of the interfaces inversely. In previous studies, we have found that the coupling of frictional and electric effects could physically change the migration, adsorption, and desorption behaviors of the polar molecules, ions, or charged particles included in aqueous or nonaqueous base lubricant toward or away from the interfaces and thus control the boundary lubrication. Recently, we have found that the friction coefficient and surface appearance of some kinds of metals could also be modulated to some extent even in pure water or pure base oils under external electric stimulations. We attribute these changes to the triboelectrochemical reactions occurred when a strong external electric field is imposed on. Based on the effective collision model of chemical reactions, a chemical potential equation, which includes both electrical and mechanical contributions, has been derived. The proposed chemical potential equation can be used to explain the observed triboelectrochemical phenomenon in experiments. Based on the model, a novel method for oxidation coloring of the selected areas in metal surfaces is proposed. Together with the physical adsorption and desorption model of lubricant additives, the triboelectrochemical reaction model can well explain the phenomena of potential-controlled boundary lubrication in different lubrication systems and also provides a theoretical basis for other solid–liquid interface processes under the effects of electromechanical coupling.

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