Patent ID: 8148683
Filing Date: 2012-04-03
Classification: G01N

Abstract:
1. A method for characterizing a membrane in a wet condition by a positron annihilation spectrometer, comprising: providing a membrane to be characterized wherein the membrane has a first surface and a second surface opposing to the first surface; performing a plasma polymerization procedure on the first surface of the membrane to form a glass-like protective layer; mounting the membrane formed with the glass-like protective layer on a sample holder to have the first surface of the membrane exposed and the second surface vacuum sealed in the sample holder; injecting a liquid into the sample holder through an inlet on the sample holder to have the liquid be in contact with the second surface of the membrane; sealing the inlet and then placing the sample holder into the vacuum chamber of the positron annihilation spectrometer; and having a positron beam impact the glass-like protective layer to thereby characterize the membrane and obtain the characteristic(s) of the membrane; wherein the glass-like protective layer has a property of vacuum sealing that the liquid can not permeate into the vacuum chamber through the glass-like protective layer.