Measurement of forces between supported cationic bilayers by colloid probe atomic force microscopy: electrolyte concentration and composition
| Autor: | Paul F. Luckham, Marc Johan Declercq, Eric San Jose Robles, Matthew Leivers, John M. Seddon |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Technology
SURFACE FORCES Materials science Chemistry Multidisciplinary Materials Science Analytical chemistry Materials Science Multidisciplinary 02 engineering and technology ADHESION 010402 general chemistry 01 natural sciences symbols.namesake Colloid FUSION MD Multidisciplinary Electrochemistry General Materials Science Lipid bilayer LIPID-BILAYERS Spectroscopy Debye length Science & Technology DOUBLE-LAYER Chemical Physics STABILITY Chemistry Physical Bilayer Surface force Force spectroscopy RECOGNITION DEPLETION ATTRACTION POLYMER Surfaces and Interfaces 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences MODEL Chemistry Physical Sciences symbols DLVO theory van der Waals force 0210 nano-technology |
| Popis: | The interactions between supported cationic surfactant bilayers were measured by colloidal probe atomic force spectroscopy and the effect of different halide salts was investigated. Di(alkyl iso-propyl ester) dimethyl ammonium methylsulfate (DIPEDMAMS) bilayers were fabricated by the vesicle fusion technique on muscovite mica. The interactions between the bilayers were measured in increasing concentrations of NaCl, NaBr, NaI and CaCl2. In NaCl the bilayer interactions were repulsive at all concentrations investigated, and the Debye length and surface potential were observed to decrease with increasing concentration. The interactions were found to follow the Electrical Double Layer (EDL) component of DLVO theory well. However Van der Waals forces were not detected, instead a strong hydration repulsion was observed at short separations. CaCl2 had a similar effect on the interactions as NaCl. NaBr and NaI were observed to be more efficient at decreasing the surface potential than the chloride salts, with the efficacy increasing with the ionic radius. |
| Databáze: | OpenAIRE |
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