聚二甲基硅氧烷膜

Abstract(#br)A new, simple method was reported to prepare PDMS membranes with micrometer size pores for microfluidic chip applications. The pores were formed by adding polystyrene and toluene into PDMS prepolymer solution prior to spin-coating and curing. The resulting PDMS membrane has a thickness of around 10\u003cce:hsp sp=\"0.25\"/\u003eμm and macropores with a diameter ranging from 1 to 2\u003cce:hsp sp=\"0.25\"/\u003eμm measured using scanning electron microscope (SEM) imaging.

Abstract(#br)The objective of this work was to apply dense polymeric membranes for pervaporation of tetrachloroethene from aqueous solution. Three membranes were evaluated: polydimethylsiloxane (PDMS-PV1 and PDMS-PV2) membranes, and a PDMS with ZSM-5 zeolite filled (PERVAP-1070) membrane. The effect of feed composition on flux and selectivity was also investigated.(#br)Tested membranes showed good properties in the separation of tetrachloroethylene, although better selectivity and enrichment of the permeate was achieved for both PDMS-PV1 and PDMS-PV2 membranes.

Abstract(#br)Large scale fabrication of non-linear microporous membranes is of technological importance in many applications ranging from separation to microfluidics. However, their fabrication using traditional techniques is limited in scope. We report on fabrication and characterization of non-linear parabolic micropores (PMS) in polymer by utilizing flow properties of fluids. The shape of the fabricated PMS corroborated well with simplified Navier–Stokes equation describing parabolic relationship of the form L – t 1/2 .