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Table 1 Contact angle of unprocessed and plasma treated membranes (n = 3)

From: Plasma modification of microporous polymer membranes for application in biomimetic dissolution studies

Membrane Pore size (μm) Plasma treatment Contact angle (θ) Standard deviation
Polypropylene 0.22 None 105° 3
PES 0.10 None 0°, 40°a 0, 2a
PES 0.20 None 0°, 40°a 0, 2a
Nylon 0.10 None 0
Nylon 0.20 None 0
Polypropylene 0.22 Water 78° 4
PES 0.10 CF4 125°, 125°a 3, 3a
PES 0.20 C6F14 110°, 110°a 3, 3a
PES 0.20 DCM 95°, 95°a 2, 2a
Nylon 0.10 CF4 135° 2
Nylon 0.20 C6F14 120° 3
Nylon 0.20 DCM 116° 4
  1. aThe manufacturing process imparts asymmetric pore structure on PES membranes such that the largest pores occur on one surface of the membrane and the smallest pore openings occur on the other surface. Therefore, each surfaces can be expected to have differing properties. As a result, the water contact angle was evaluated on each surface of PES membranes to ensure treatments were consistent. Nylon and PP membranes have symmetric surface properties and the two surfaces are not distinguishable from one another