Full text loading...
(a) Schematic diagram of the DEP experimental setup. Simplified nonuniform ac-field lines (dash lines) are idealized, indicating that the electric field becomes the strongest at the edge of electrodes and weakened into the suspension (Ref. 10). (b) Measured for latex particles of (circles) and (triangles) against . Inset: overall double-layer surface conductance against by fitting using Eqs. (2) and (3). (c) and (d) Representative fluorescent micrographs depict that 460 and latex particles are collected and assembled near the electrodes by at [Fig. 1(c)] and repelled away from the electrodes and diffuse into the suspension at while approaching zero DEP at .
Reconstructed assembly structures of latex particles of (green) and (red) collected at the edge of electrodes for the cases of (a) , , (b) , , (c) , , and (d) , . (e) 2D particle volume fraction measured over the area of against elapsed time for latex particles of (circles) and (triangles) for the above cases of (a) with open symbols and (b) with solid symbols. ac-field voltage amplitude constant at is applied to the coplanar gold electrodes with a gap distance of .
Low-frequency threshold, against medium conductivity, in a logarithmic plot for latex particles of (circles). It is noted that is determined based on for latex particles of , while it is difficult to determine for small particles as small particles are often mixed and hidden underneath large particles. Linear fitting in the range of indicates a power law of .
Article metrics loading...