Figure 3
From: A novel TEM grid sampler for airborne particles to measure the cell culture surface dose
TEM images of exposed copper grids: Magnitude 4000, Voltage 80 kV; Representative image of the grids in the different positions of the grid sampling tool, from bottom to top: centre, inner ring, edge. Exposure experiments performed with increasing electrostatic deposition, starting without electric potential on the grid holding steel plate on the left going up to 1200 V on the right.
