Gel-Template-Leaching, ein neuer Weg zu mikroporoesen und ionenselektiven Membranen Schlussbericht

Functional membranes, that selectively recognise and transport ions or molecules, can not technically be prepared presently. Technical porous membranes do not posses pores of well defined geometry or narrow pore radii distributions. A new process for the preparation of membranes with exactly defined pores or embedded supramolecular transport channels has been elaborated, making use of self organising compounds. For this purpose low molecular weight amphiphiles ('gelators') have been synthesised, that associate in methacrylate mixtures to network of solid cylinder aggregates. Thin films (ca. 20 #mu#m) of the gelated mixtures have been cured via UV initiated radical polymerisation. After extraction of the gelator network with ethanol or water a porous membrane remains, containing cylinder pores of uniform diameter. Depending on the gelator, pore diameters between 5 and 500 nm can be produced. By chemical modification of the pores inner walls with quarterny ammonium groups anionselective membranes have been obtained, exhibiting anion:cation selectivities up to 350 (0.001 M NaClO_4, 20 C). (orig.)SIGLEAvailable from TIB Hannover: F00B244 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Bildung und Forschung (BMBF), Bonn (Germany)DEGerman