Tailoring of free standing microchannel structures via microtemplating

0370044 - ÚFM 2012 RIV GB eng J - Journal Article
Salamon, D. - Chlup, Zdeněk - Lefferts, L. - Wessling, M.
Tailoring of free standing microchannel structures via microtemplating.
Materials Research Bulletin. Roč. 46, č. 4 (2011), s. 505-511. ISSN 0025-5408. E-ISSN 1873-4227
Institutional research plan: CEZ:AV0Z20410507
Keywords : Ceramics * Thermogravimetric analysis * Microstructure
Subject RIV: JH - Ceramics, Fire-Resistant Materials and Glass
Impact factor: 2.105, year: 2011

The preparation of ceramic microchannel structures from powder based material is a time consuming, expensive or inflexible process. This work demonstrates microtemplating – a new reliable and economical fabrication method for preparing ceramic alumina self-supporting microchannels with diameters from 10 to 1000 mm. The basis for this method is the controlled dip-coating of a sacrificial polymeric fiber template with suspensions containing sinterable particles. Subsequent sintering results in self-supporting ceramic microchannels. Thermal behavior of a microtemplate is critical for achieving self-supporting microchannels. We used polyamide, keratin, para-aramide, polypropylene, and polyimide fibers to set models of microtemplate thermal behavior. We found that the negative influence of thermal expansion and gas production could be eliminated by microtemplates with hollow and porous internal structure. Furthermore we show flexibility of the green stage procedure on an alumina microfluidic loop and a multichannel system with gradient porosity. The microtemplating is demonstrated to be an inexpensive and flexible process.
Permanent Link: http://hdl.handle.net/11104/0203957