How to Distinguish Energetic Surface Heterogeneity from Electrostatic Interactions in the Case of Hydrogen Ion Adsorption from Solution onto Oxides

Langmuir ◽  
2006 ◽  
Vol 22 (16) ◽  
pp. 6761-6763 ◽  
Author(s):  
Wojciech Piasecki
Keyword(s):  
Electrostatic Interactions ◽  
Surface Heterogeneity ◽  
Hydrogen Ion ◽  
Ion Adsorption ◽  
Adsorption From Solution

scholarly journals Colloidal stability of the living cell

2020 ◽  
Vol 117 (19) ◽  
pp. 10113-10121 ◽  
Author(s):  
Håkan Wennerström ◽  
Eloy Vallina Estrada ◽  
Jens Danielsson ◽  
Mikael Oliveberg
Keyword(s):  
Protein Interactions ◽  
Electrostatic Interactions ◽  
Colloidal Stability ◽  
Surface Heterogeneity ◽  
Specific Protein ◽  
Cellular Systems ◽  
Dispersion Force ◽  
Protein Protein Interactions ◽  
Protein Surfaces ◽  
Dense Crowd

Cellular function is generally depicted at the level of functional pathways and detailed structural mechanisms, based on the identification of specific protein–protein interactions. For an individual protein searching for its partner, however, the perspective is quite different: The functional task is challenged by a dense crowd of nonpartners obstructing the way. Adding to the challenge, there is little information about how to navigate the search, since the encountered surrounding is composed of protein surfaces that are predominantly “nonconserved” or, at least, highly variable across organisms. In this study, we demonstrate from a colloidal standpoint that such a blindfolded intracellular search is indeed favored and has more fundamental impact on the cellular organization than previously anticipated. Basically, the unique polyion composition of cellular systems renders the electrostatic interactions different from those in physiological buffer, leading to a situation where the protein net-charge density balances the attractive dispersion force and surface heterogeneity at close range. Inspection of naturally occurring proteomes and in-cell NMR data show further that the “nonconserved” protein surfaces are by no means passive but chemically biased to varying degree of net-negative repulsion across organisms. Finally, this electrostatic control explains how protein crowding is spontaneously maintained at a constant level through the intracellular osmotic pressure and leads to the prediction that the “extreme” in halophilic adaptation is not the ionic-liquid conditions per se but the evolutionary barrier of crossing its physicochemical boundaries.

scholarly journals On the Nature of the Energetic Surface Heterogeneity in Ion Adsorption at an Electrolyte/Oxide Interface. Theoretical Studies of the Correlations between Binding-to-Surface Energies of Various Surface Complexes

1996 ◽  
Vol 14 (1) ◽  
pp. 25-38 ◽  
Author(s):  
Wladyslaw Rudziński ◽  
Robert Charmas ◽  
Wojciech Piasecki
Keyword(s):  
Surface Heterogeneity ◽  
Ion Adsorption ◽  
Surface Oxygen ◽  
Oxide Interface ◽  
Surface Complexes ◽  
Surface Energies ◽  
Outermost Surface ◽  
Energetic Heterogeneity ◽  
Total Lack ◽  
Oxide Electrolyte

When a metal oxide is brought into contact with an electrolyte, the outermost surface oxygens adsorb one or two protons, a cation or an aggregate composed of two protons and an anion. In this way, various surface complexes are formed. The actual surfaces are, as a rule, geometrically distorted. This causes a variation of the binding-to-surface energy from one surface oxygen to another for each of these complexes. This energetic heterogeneity of the actual oxide surfaces strongly affects the adsorption of ions within the electrical double layer formed at the oxide/electrolyte interface. The way in which the surface heterogeneity affects the adsorption of ions depends on the correlations between the binding-to-surface energies of the various surface complexes. To date, two extreme models have been considered by us; one assuming the existence of very high correlations, and the other one assuming a total lack of correlation between binding-to-surface energies in going from one surface oxygen to another. This paper presents a theoretical study of ion adsorption based on the assumption of a partial correlation between the binding-to-surface energies.

Hydrogen ion adsorption at the rutile-water interface to 250°C

1994 ◽  
Vol 58 (24) ◽  
pp. 5627-5632 ◽  
Author(s):  
Michael L. Machesky ◽  
Donald A. Palmer ◽  
David J. Wesolowski
Keyword(s):  
Hydrogen Ion ◽  
Ion Adsorption ◽  
Water Interface

Supramolecular Assemblies for Second Order Nonlinear Optics Stabilized by Electrostatic Interaction

1998 ◽  
Vol 07 (03) ◽  
pp. 385-395 ◽  
Author(s):  
H. Bock ◽  
R. C. Advincula ◽  
E. F. Aust ◽  
J. Käshammer ◽  
W. H. Meyer ◽  
...  
Keyword(s):  
Nonlinear Optics ◽  
Self Assembly ◽  
Electrostatic Interactions ◽  
Orientational Order ◽  
Second Order ◽  
Langmuir Blodgett ◽  
Supramolecular Architectures ◽  
Buffer Material ◽  
Adsorption From Solution ◽  
Synthetic Effort

Electrostatic interactions are being used instead of covalent linkage to stabilize orientational order in novel materials for second order nonlinear optics. In complex supramolecular architectures, this simplifies the variation of chromophores or polymeric backbones. Other molecules can readily be inserted into the system in order to tune optical or thermodynamic properties without synthetic effort. Noncentrosymmetric ultrathin films consisting of highly ordered "active-passive" AB-Y-type multilayers of NLO active ionic amphiphiles and an ionic polymeric buffer material have been obtained by the Langmuir-Blodgett-Kuhn (LBK) technique. Combination with self-assembly by adsorption from solution is demonstrated.

Electrostatic interactions at the plasma membrane

1975 ◽  
Vol 271 (912) ◽  
pp. 273-275
Keyword(s):  
Plasma Membrane ◽  
Electrostatic Interactions ◽  
Local Environment ◽  
Hydrogen Ion ◽  
Red Cell ◽  
Cell Plasma Membrane ◽  
Cell Plasma

Hydrogen-ion titration has been used to detect the presence of charged groups on the human red-cell plasma membrane. The findings are discussed in terms of the effect of the local environment on electrostatic interactions between the charged groups.

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