Jan 01, 2016 · PTFE membranes (50, 100 nm) and Nuclepore filters (50, 400 nm) were challenged with 1.7 nm manganese doped ZnS and 6.6 nm ZnO quantum dots (QDs), 12.4, 34.4 and 50 nm Au and 150 nm SiO 2 nanoparticles. For larger and medium sized particles, sieving and eventually pore blockage phenomena were observed.