Open AccessTime-scale dependent Brownian motion of nanoparticles in clusters at a solid-liquid interface by laser trapping
Author(s) -
Itsuo Hanasaki,
Chie Hosokawa
Publication year - 2019
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1220/1/012054
Subject(s) - brownian motion , trapping , interface (matter) , scale (ratio) , nanoparticle , materials science , laser , chemical physics , nanotechnology , optics , physics , composite material , quantum mechanics , biology , wetting , ecology , sessile drop technique
Nanoparticles in a cluster trapped by laser-induced force field show Brownian motion at solid-liquid interfaces. The cluster formation means that the particles are highly concentrated. In general, the diffusion coefficients of particles in fluids decrease with substantially high concentration and also in the vicinity of solid walls due to the hydrodynamic effect. The particle trajectory data obtained from the experimental measurements show that the longer time span of observation leads to smaller diffusion coefficient due to the confinement effect. However, they also exhibit higher diffusion coefficient compared to the the bulk condition when evaluated at a sufficiently short time span of the frame interval under the condition of sufficiently high laser powers.