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  4. Hydraulic Transport Across Hydrophilic and Hydrophobic Nanopores: Flow Experiments with Water and n-Hexane
 
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Hydraulic Transport Across Hydrophilic and Hydrophobic Nanopores: Flow Experiments with Water and n-Hexane

Publikationstyp
Journal Article
Date Issued
2015-12-12
Sprache
English
Author(s)
Gruener, Simon  
Wallacher, Dirk  
Greulich, Stefanie  
Busch, Mark  orcid-logo
Huber, Patrick  orcid-logo
Institut
Werkstoffphysik und -technologie M-22  
TORE-URI
http://hdl.handle.net/11420/9279
Journal
Physical review E - Covering statistical, nonlinear, biological, and soft matter physics  
Volume
93
Issue
1
Article Number
013102
Citation
Physical Review E 93 (1): 013102 (2015-12-12)
Publisher DOI
10.1103/PhysRevE.93.013102
Scopus ID
2-s2.0-84955249937
PubMed ID
26871150
ArXiv ID
1512.03908v1
We experimentally explore pressure-driven flow of water and n-hexane across nanoporous silica (Vycor glass monoliths with 7 or 10 nm pore diameters, respectively) as a function of temperature and surface functionalization (native and silanized glass surfaces). Hydraulic flow rates are measured by applying hydrostatic pressures via inert gases (argon and helium, pressurized up to 70 bar) on the upstream side in a capacitor-based membrane permeability setup. For the native, hydrophilic silica walls, the measured hydraulic permeabilities can be quantitatively accounted for by bulk fluidity provided we assume a sticking boundary layer, i.e. a negative velocity slip length of molecular dimensions. The thickness of this boundary layer is discussed with regard to previous capillarity-driven flow experiments (spontaneous imbibition) and with regard to velocity slippage at the pore walls resulting from dissolved gas. Water flow across the silanized, hydrophobic nanopores is blocked up to a hydrostatic pressure of at least 70 bar. The absence of a sticking boundary layer quantitatively accounts for an enhanced n-hexane permeability in the hydrophobic compared to the hydrophilic nanopores.
Subjects
Physics - Fluid Dynamics
Physics - Fluid Dynamics
Physics - Mesoscopic Systems and Quantum Hall Effect
Physics - Materials Science
Physics - Soft Condensed Matter
Physics - Chemical Physics
DDC Class
530: Physics
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