nano-membrane; fabrication and applications
Paper ID : 1379-MST2015-FULL
Afsaneh Mollahosseini *, Mahsa Konh
Iran University of Science and Technology
That importance of having a good sample preparation among all experiments is out of question. There is no denying the fact that those techniques based on membrane extraction can be highly selective, provide high enrichment factor and facilitate on-line measurements. Hitherto, the best way of spending time and effort for sample preparation has been discussed by amending the membrane techniques. Consequently many activities in order to improve two important factors in membrane: flux and selectivity, had been take place. In this paper we discuss those activities which based on the use of Nano-technology in membrane to provide a more desirable structure named “nano-membrane”, furthermore we mention their fabrication and their potential applications.
Generally speaking, nano-membranes may be defined as freestanding or free-floating artificial or natural structures with a thickness below 10 nm and a large aspect ratio which may exceed 1.000,000. As far as their classification is concerned, the basic one would be to artificial (man-made) ones and the organic (soft) ones. To delineate, a general procedure to fabricate an artificial nano-membrane has these important technological steps: 1. initial structure, 2. Deposition, 3. Etching/removal and 4. Freeing the membrane.
Nano-membrane functionalization is the essential step towards fundamental extension of their application. To explain there are 4 base ways for this purpose that includes the use of active fillers, lamination, structural modification and surface modification.
Nano-membranes have been used in many applications since now, e.g., gas separation, extraction, pervaporation, waste-water treatment and water purification and even in drug delivery systems and other bio-medical applications. Implementation of their applications requires co-operation of analytical chemists and nano-material scientists due to the importance of both design the nano-structures and knowledge of separation methods.
nano-membrane sample preparation membrane extraction
Status : Paper Accepted (Poster Presentation)