2016/01/22 by Andreas P. Bregulla, Andreas Bregulla, Aloïs Würger +4 · 3 citations
Chemistry · Engineering · Physics and Astronomy · #Advanced Thermodynamics and Statistical Mechanics #Boundary layer #Boundary value problem #Electrostatics and Colloid Interactions #Field-Flow Fractionation Techniques #Flow (mathematics) #Materials science #Mechanics #Microscale chemistry #Physics #Thermodynamics #physics.chem-ph #physics.flu-dyn #physics.optics
paper · pdf · doi:10.1103/physrevlett.116.188303
published as Phys. Rev. Lett. 116, 188303 (2016) · 12 pages, 4 figures
arxiv created 2016/01/22 · openalex publication_date 2016/05/05 · arxiv updated 2016/05/11 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We report on the first microscale observation of the velocity field imposed by a nonuniform heat content along the solid-liquid boundary. We determine both radial and vertical velocity components of this thermo-osmotic flow field by tracking single tracer nanoparticles. The measured flow profiles are compared to an approximate analytical theory and to numerical calculations. From the measured slip velocity we deduce the thermo-osmotic coefficient for both bare glass and Pluronic F-127 covered surfaces. The value for Pluronic F-127 agrees well with Soret data for polyethylene glycol, whereas that for glass differs from literature values and indicates the complex boundary layer thermodynamics of glass-water interfaces.