Fig. 2
From: Fluorescent label-free quantitative detection of nano-sized bioparticles using a pillar array
Visualization of electrostatic dominant lateral shift phenomena. a Shows a tracked motion of 1 µm PS beads within a DLD segment with predicted Dapp to be > 700 nm and COMSOL computation of various trajectory taken by a 1 µm particle due to shifts in stream lines. Scale bar is 5 µm. b NaCl buffer concentration modulates the electrostatic interactions and thus changes the Dapp. A decrease in ionic concentration results in a larger electrostatic repulsion and thus a positive increase in lateral shift where Dapp > Dp. Conversely, the particle will appear smaller than Dp due to increased electrostatic shielding for higher ionic concentrations. The error bars show the SD from at least 50 sample counts of beads
