scholarly journals Gramicidin ion channels in a lipid bilayer supported on polyelectrolyte multilayer films: an electrochemical impedance study

Soft Matter ◽  
2017 ◽  
Vol 13 (47) ◽  
pp. 8922-8929 ◽  
Author(s):  
Eleftheria Diamanti ◽  
Eduart Gutiérrez-Pineda ◽  
Nikolaos Politakos ◽  
Patrizia Andreozzi ◽  
María José Rodriguez-Presa ◽  
...  
Keyword(s):  
Ion Channels ◽  
Ion Transport ◽  
Lipid Bilayer ◽  
Electrochemical Impedance ◽  
Multilayer Films ◽  
Polyelectrolyte Multilayer ◽  
Impedance Study

Selective ion transport through gramicidin channels integrated in a lipid bilayer assembled on polyelectrolyte multilayer films.

scholarly journals Bombardment induced ion transport – part IV: ionic conductivity of ultra-thin polyelectrolyte multilayer films

2016 ◽  
Vol 18 (6) ◽  
pp. 4345-4351 ◽  
Author(s):  
Veronika Wesp ◽  
Matthias Hermann ◽  
Martin Schäfer ◽  
Jonas Hühn ◽  
Wolfgang J. Parak ◽  
...  
Keyword(s):  
Ionic Conductivity ◽  
Ion Transport ◽  
Multilayer Films ◽  
Low Energy ◽  
Ionic Conductance ◽  
Polyelectrolyte Multilayer ◽  
Transport Part

Low energy bombardment induced ion transport (BIIT) studies demonstrate that the ionic conductance of ultra-thin polyelectrolyte multilayer (PEM) films depends non-monotonically on the number of bilayers.

Endothelial cell adhesion on polyelectrolyte multilayer films functionalised with fibronectin and collagen

2012 ◽  
Vol 66 (5) ◽  
Author(s):  
Nahla Zanina ◽  
Soumaya Haddad ◽  
Ali Othmane ◽  
Thierry Jouenne ◽  
David Vaudry ◽  
...  
Keyword(s):  
Endothelial Cells ◽  
Electrochemical Impedance ◽  
Colorimetric Assay ◽  
High Surface ◽  
Multilayer Films ◽  
Polyelectrolyte Multilayer ◽  
Adhesion Properties ◽  
Force Microscopy ◽  
Ohmic Resistance ◽  
Biomaterial Surfaces

AbstractThe seeding of endothelial cells on biomaterial surfaces has become a major challenge to achieve better haemocompatibility of these surfaces. Multilayers of polyelectrolytes formed by the layerby-layer method are promising in this respect. In this study, the interactions of endothelial cells with multilayered polyelectrolytes films were investigated. The build-ups were prepared by selfassembled alternatively adsorbed polyanions and polycations functionalised with fibronectin and collagen. Anionic poly(sodium 4-styrenesulfonate) and cationic poly(allylamine hydrochloride) polyelectrolytes were chosen as a model system. Elaborated surfaces were characterised by electrochemical impedance spectroscopy and cyclic voltammetry. The modified electrode showed good reversible electrochemical properties and high stability in an electrolyte solution. The film ohmic resistance was highest when the film was coated with fibronectin; the parameters so determined were correlated with atomic force microscopy images. Cell colorimetric assay (WST-1) and immunofluorescence were used to quantify the cell viability and evaluate the adhesion properties. When cultured on a surface where proteins were deposited, cells adhered and proliferated better with fibronectin than with collagen. In addition, a high surface free energy was favourable to adhesion and proliferation (48.8 mJ m−2 for fibronectin and 39.7 mJ m−2 for collagen, respectively). Endothelial cells seeded on functionalised-polyelectrolyte multilayer films showed a good morphology and adhesion necessary for the development of a new endothelium.

Asymmetric lipid bilayer sandwiched in polyelectrolyte multilayer films through layer-by-layer assembly

Soft Matter ◽  
2009 ◽  
Vol 5 (1) ◽  
pp. 228-233 ◽  
Author(s):  
Jiangshan Chen ◽  
Ralf Köhler ◽  
Thomas Gutberlet ◽  
Helmuth Möhwald ◽  
Rumen Krastev
Keyword(s):  
Lipid Bilayer ◽  
Multilayer Films ◽  
Layer By Layer ◽  
Polyelectrolyte Multilayer ◽  
Layer By Layer Assembly ◽  
Layer Assembly

Facilitated ion transport through polyelectrolyte multilayer films containing metal-binding ligands

2014 ◽  
Vol 459 ◽  
pp. 169-176 ◽  
Author(s):  
Chunjuan Sheng ◽  
Salinda Wijeratne ◽  
Chao Cheng ◽  
Gregory L. Baker ◽  
Merlin L. Bruening
Keyword(s):  
Ion Transport ◽  
Metal Binding ◽  
Multilayer Films ◽  
Polyelectrolyte Multilayer

scholarly journals A gateway for ion transport on gas bubbles pinned onto solids

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Veton Haziri ◽  
Tu Pham Tran Nha ◽  
Avni Berisha ◽  
Jean-François Boily
Keyword(s):  
Ion Transport ◽  
Metal Ion ◽  
Electrochemical Impedance ◽  
Gas Bubbles ◽  
Open Circuit ◽  
Double Layers ◽  
Water Geochemistry ◽  
Chemical Potentials ◽  
Pore Water Geochemistry ◽  
Electric Potentials

AbstractGas bubbles grown on solids are more than simple vehicles for gas transport. They are charged particles with surfaces populated with exchangeable ions. We here unveil a gateway for alkali metal ion transport between oxygen bubbles and semi-conducting (iron oxide) and conducting (gold) surfaces. This gateway was identified by electrochemical impedance spectroscopy using an ultramicroelectrode in direct contact with bubbles pinned onto these solid surfaces. We show that this gateway is naturally present at open circuit potentials, and that negative electric potentials applied through the solid enhance ion transport. In contrast, positive potentials or contact with an insulator (polytetrafluoroethylene) attenuates transport. We propose that this gateway is generated by overlapping electric double layers of bubbles and surfaces of contrasting (electro)chemical potentials. Knowledge of this ion transfer phenomenon is essential for understanding electric shielding and reaction overpotential caused by bubbles on catalysts. This has especially important ramifications for predicting processes including mineral flotation, microfluidics, pore water geochemistry, and fuel cell technology.

Membrane Alterations Induced by Amphiphiles

1989 ◽  
Vol 16 (3) ◽  
pp. 274-280
Author(s):  
Boris Isomaa ◽  
Henry Hägerstrand ◽  
Gun I.L. Paatero
Keyword(s):  
Ion Transport ◽  
Lipid Bilayer ◽  
Erythrocyte Membrane ◽  
Cell Shape ◽  
Osmotic Fragility ◽  
Molecular Shape ◽  
Specific Interactions ◽  
Amphiphilic Compounds ◽  
Rapid Formation ◽  
Polar Parts

Amphiphilic compounds with distinct apolar and polar parts are readily intercalated into the erythrocyte membrane. When intercalated into the membrane, amphiphiles are probably orientated so that the polar head is at the polar-apolar interface of the lipid bilayer and the hydrophobic part within the apolar core of the bilayer. However, by virtue of their difference in molecular shape from the bulk lipids of the lipid bilayer, it is possible that the intercalated amphiphiles are partly segregated from bulk lipids and accumulate at protein-lipid interfaces in the bilayer, where the packing of the bilayer lipids may be less ordered. Our studies show that amphiphiles, when intercalated into the erythrocyte membrane, trigger alterations in several membrane-connected functions. Some of the alterations induced (decreased osmotic fragility, increased passive potassium fluxes) seem to be due to non-specific interactions of the amphiphiles with the membrane, whereas other functions (ion transport mediated by membrane proteins, regulation of cell shape) seem to be sensitive to particular features of the amphiphiles. Our studies indicate that the intercalation of amphiphiles into the erythrocyte membrane must involve rearrangements within the lipid bilayer. We have suggested that, when intercalated into the lipid bilayer, amphiphiles trigger a rapid formation of non-bilayer phases, which protect the bilayer against a collapse and bring about a trans-bilayer redistribution of intercalated amphiphiles as well as of bilayer lipids. At high sublytic concentrations, this process may also involve a release of microvesicles from the membrane.

Potassium Ion Transport by Valinomycin across a Hg-Supported Lipid Bilayer

2005 ◽  
Vol 127 (38) ◽  
pp. 13316-13323 ◽  
Author(s):  
Lucia Becucci ◽  
Maria Rosa Moncelli ◽  
Renate Naumann ◽  
Rolando Guidelli
Keyword(s):  
Ion Transport ◽  
Lipid Bilayer ◽  
Potassium Ion ◽  
Supported Lipid Bilayer ◽  
Potassium Ion Transport

Controlling the Growth Regime of Polyelectrolyte Multilayer Films:  Changing from Exponential to Linear Growth by Adjusting the Composition of Polyelectrolyte Mixtures

Langmuir ◽  
2004 ◽  
Vol 20 (5) ◽  
pp. 1980-1985 ◽  
Author(s):  
Eric Hübsch ◽  
Vincent Ball ◽  
Bernard Senger ◽  
Gero Decher ◽  
Jean-Claude Voegel ◽  
...  
Keyword(s):  
Linear Growth ◽  
Multilayer Films ◽  
Polyelectrolyte Multilayer ◽  
Growth Regime
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