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Table 2 Values of diffusion coefficients and surface tension parameters from analytical simulation on each position-time curve of all the microfluidic flow

From: Nanoscale surface modifications to control capillary flow characteristics in PMMA microfluidic devices

Surface modification Surface structure Diffusion coefficient, D(ρm2 s-1) γsa - γsl N/m
Air DBD processed Flat surface 66153420 0.004330
  100 μm pillar 38677500 0.002531
  200 μm pillar 23777420 0.001556
  300 μm pillar 12537020 0.000820
Nitrogen plasma treated Flat surface 45091690 0.002951
  100 μm pillar 20411460 0.001336
  200 μm pillar 12500060 0.000818
  300 μm pillar 11718310 0.000767
Control PMMA Flat surface 6337320 0.000414
  100 μm pillar 3219800 0.000210
  200 μm pillar 2142380 0.000140
  300 μm pillar 1477070 0.000096
Undoped DLC coated Flat surface 10878150 0.000712
  100 μm pillar 3993380 0.000261
  200 μm pillar 2983690 0.000195
  300 μm pillar 1782760 0.000116
Si-doped DLC coated Flat surface 4044020 0.002646
  100 μm pillar 2058300 0.000134
  200 μm pillar 1449660 0.000094
  300 μm pillar 1175890 0.000076