光谱椭偏仪

Abstract(#br)A nondestructive technique is presented for in-situ analysis of solvent induced membrane swelling. The technique is based on spectroscopic ellipsometry (SE) and allows simultaneous measurement of membrane film thickness and solvent sorption. The attainable experimental conditions are only limited by the test cell (≤473.15 K, ≤20 MPa) and by far exceed those encountered in typical solvent resistant nanofiltration (SRNF) applications.

Abstract(#br)A nondestructive technique is presented for in-situ analysis of solvent induced membrane swelling. The technique is based on spectroscopic ellipsometry (SE) and allows simultaneous measurement of membrane film thickness and solvent sorption. The attainable experimental conditions are only limited by the test cell (≤473.15 K, ≤20 MPa) and by far exceed those encountered in typical solvent resistant nanofiltration (SRNF) applications.

Polydimethylsiloxane (PDMS) is an important polymer with numerous applications. Herein, the authors report the optical function(s) of PDMS from 191 to 1688 nm as determined from reflection spectroscopic ellipsometry (SE) and transmission ultraviolet-visible data. Two commercial samples of liquid PDMS (PDMS700 and PDMS2000) with molecular weights of 700–1500 g/mol and 2000–3500 g/mol, respectively, were analyzed. Both samples were linear polymers terminated with silanol groups. The optical functions determined from the two materials were essentially identical.