Simulation and experimental measurements were used aiming at better understanding flow behavior in planar and three-dimensional microchannels used for separation or preconcentration. Two different microchannels configurations were designed, manufactured in acrylic and the surface was modified to adsorb volatile organic compounds (VOCs). Both channels configuration are 73 cm long, 100 µm wide and 40 µm deep. Simulation was carried out in COMSOL (FEMLAB) 3.2® and COSMOS flow 5.0® programs, tracer visualization and quartz crystal microbalance data were evaluated according to chromatographic concepts. Due to the higher axial velocity, planar microchannels are more adequate for preconcentration whereas three-dimensional ones show a good performance in the separation process.
Biografia do Autor
Roberto da Rocha Lima, Instituto de Física da USP
Sou graduado em Tecnologia de Materiais Proc. e Comp. Eletrônicos pela Faculdade de Tecnologia de São Paulo (1996), obtive meu grau de mestre e doutor, ambos em Engenharia Elétrica pela Escola Politécnica da Universidade de São Paulo (2004 e 2009, respectivamente). No Instituto de Física da Universidade de São Paulo sou especialista e responsável pelo sistema de vácuo dos equipamentos de pesquisa do Laboratório do Acelerador Linear (máquina aceleradora, forno de alto vácuo, etc.), também desenvolvo pesquisa em filmes finos e compósitos. Filmes produzidos em equipamento de plasma construído em laboratório como parte do meu doutorado.
Lilian Marques Silva, Polytechnic School, University of São Paulo
Obtained her degree in Technology in Materials, Process and Electronics Devices from the Faculty of Technology of São Paulo in 2002 and her MSc degree in Electrical Engineering from the Polytechnic School, University of São Paulo in 2005.
Eliphas Wagner Simões, Polytechnic School, University of São Paulo
Obtained his degree in electrical engineering from Faculty Alvares Penteado in 1990. Since 2001 he has been an associated researcher at the Laboratório de Sistemas Integráveis of Polytechnic School—University of São Paulo where he received an MS degree in 1995 and a PhD degree in 2005.
Maria Lúcia Pereira da Silva, Polytechnic School, University of São Paulo and Faculty of Technology of São Paulo
Obtained her degree in chemistry from University of São Paulo in 1980. She has been a researcher Laboratório de Sistemas Integráveis of Polytechnic School—University of São Paulo since 1985 and a professor at Faculty of Technology of São Paulo since 1992. She received an MS degree in 1989 and her PhD degree in physical chemistry in 1995.
