Encyclopedia of Membranes

2016 Edition
| Editors: Enrico Drioli, Lidietta Giorno

Fixed-Site (Chained-Carrier) Membranes

Reference work entry
DOI: https://doi.org/10.1007/978-3-662-44324-8_231

Carrier-facilitated transport processes in liquid membranes often achieve spectacular separations between closely related species because of carrier selectivity. The instability of supported liquid membranes (SLM) or emulsion type of membranes (ELM) is a major technical challenge for their implementation at large industrial scale (Mulder 2003; Baker 2004; Koros and Mahajan 2000). One approach to stabilize the membranes is to covalently link the carrier complex to the matrix polymer resulting in fixed-site carrier (chained) membranes.

The term chained carrier refers to transport mechanism theory rather than to position of the carrier on the membrane. E. L. Cussler (Cussler et al. 1989) explained the facilitated transportby a “chained carrier” theory that implies a certain mobility of polymeric chains and that a percolation threshold appears when two chained carriers are too far apart. Chained carriers, by comparison to mobile carriers diffusing freely within a liquid membrane, have...

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© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  1. 1.Polymer Particles and Surface Chemistry, Materials and ChemistrySINTEFTrondheimNorway