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| Title: Direct Measurements of Hydrophobic Slippage Using Double-Focus Fluorescence Cross-Correlation |
| Authors: |
| Author Full Names: Vinogradova, Olga I.; Koynov, Kaloian; Best, Andreas; Feuillebois, Francois |
| Source: PHYSICAL REVIEW LETTERS 102 (11): Art. No. 118302 MAR 20 2009 |
| Language: English |
| Document Type: Article |
| KeyWords Plus: FORCE MICROSCOPE; SURFACES; DRAINAGE; FLOW |
| Abstract: We report the results of direct measurements of velocity profiles in a microchannel with hydrophobic and hydrophilic walls, using a new high-precision method of double-focus spatial fluorescence cross correlation under a confocal microscope. In the vicinity of both walls the measured velocity profiles do not go to zero by supplying a plateau of constant velocity. This apparent slip is proven to be due to a Taylor dispersion, an augmentation by shear diffusion of nanotracers in the direction of flow. Comparing the velocity profiles near the hydrophobic and hydrophilic walls for various conditions shows that there is a true slip length due to hydrophobicity. This length, of the order of several tens of nanometers, is independent of the electrolyte concentration and shear rate. |
| Reprint Address: Vinogradova, OI, Russian Acad Sci, AN Frumkin Inst Phys Chem & Electrochem, 31 Leninsky Prospect, Moscow 119991, Russia. |
| Research Institution addresses: [Vinogradova, Olga I.] Russian Acad Sci, AN Frumkin Inst Phys Chem & Electrochem, Moscow 119991, Russia; [Koynov, Kaloian; Best, Andreas] Max Planck Inst Polymer Res, D-55128 Mainz, Germany; [Feuillebois, Francois] ESPCI, PMMH, CNRS, UMR 7636, F-75231 Paris, France |
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| Cited Reference Count: 22 |
| Times Cited: 0 |
| Publisher: AMER PHYSICAL SOC; ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA |
| Subject Category: Physics, Multidisciplinary |
| ISSN: 0031-9007 |
| DOI: 10.1103/PhysRevLett.102.118302 |
| IDS Number: 421TC |
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