Stabilization of supported liquid membranes by interfacial polymerization top layers

X-Ray Photoelectron Spectroscopy Analysis of Di-(2-ethylhexyl) Phosphoric Acid Activated Membranes

“…Assuming that the main causes for SLM instability are the solubility of the liquid membrane components or its emulsification in the adjacent aqueous phases, different approaches to improving SLMs stability have been suggested, such as reimpregnation of the support (4), sandwiching of SLMs (5), or gelation of the liquid membrane phase (6). Lately, Kemperman et al (7) have optimized supported liquid membranes by covering the impregnated support with a thin polyamide layer. An alternative type of SLM, activated composite membranes (ACMs) containing different carriers for cation transport, have been developed by Oleinikova et al (8); these membranes show high stability and metal permeation rates.…”

Polymeric Pseudo-Liquid Membranes from Poly(2-ethylhexyl methacrylate)

“…[1][2][3][4][5][6] It is an important and interesting subject to develop stable and defect-free liquid membranes so that neither membrane solvent nor transporter may be lost to the aqueous phases. To this end, there have been reported various types of durable liquid membranes, such as 1) polymer liquid crystal composite membranes, 7,8 2) polymer inclusion membranes, [9][10][11][12] 3) organogel membranes, 13,14 4) supported polymeric liquid membranes, [15][16][17][18] 5) stabilization of top layer of supported liquid membranes by interfacial polymerization [19][20][21] or plasma polymerization, 22 and 6) polymeric pseudo-liquid membranes. 23,24 In the case that a candidate material with rubbery state under the operation condition gives durable selfstanding membranes, such a rubbery material could be applicable to the membrane matrix of polymeric pseudo-liquid membrane.…”

Understanding the influence of the ionic liquid composition and the surrounding phase nature on the stability of supported ionic liquid membranes

“…Consequently, the SLM stability may also be affected by the chemical nature and textural properties of polymeric support, the type of organic solvent used in the studied process, the preparation method, 27,28 etc., while the time periods for observed instability varies from a few hours to several months depending on the system. 20,25 Many research groups have achieved SLMs with improved stability by a variety of means, including polymerization of the top layers, 29 gelation of a liquid membrane, 22,30 and interposition of a highly permeable material. 31 In addition to these studies, much attention has been paid to use of ionic liquids as liquid phase in SLMs.…”