Spreading and two-dimensional mobility of long-chain alkanes at solid/gas interfaces |
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Authors: | Lazar Paul Schollmeyer H Riegler H |
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Institution: | Max-Planck-Institut für Kolloid- und Grenzfl?chenforschung, Am Mühlenberg, D-14476 Potsdam, Germany. |
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Abstract: | Long-chain n alkanes on solid surfaces can form partially wetting liquid alkane droplets coexisting with solid multilayer terraces. We propose a diffusivelike alkane flow between terrace edge and droplet perimeter through a molecularly thin "precursorlike" film. Depending on the (uniform!) sample temperature, either droplet or terrace edge are not in thermodynamic equilibrium. This leads to a chemical potential gradient, which drives the reversible alkane flow. The gradient can be adjusted and calculated independently from the phenomenological diffusion coefficient. |
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