Fevereiro 2015 vol. 1 num. 2 - XX Congresso Brasileiro de Engenharia Química

Artigo - Open Access.

Idioma principal




ABSTRACT- Basically, micromodels are devices simulating a porous network and are useful tools for studying the transport mechanisms that govern the drying processes of pore structures such as in food. 2D micromodels have traditionally been fabricated with glass and resin and have been very effective instruments to observe and quantify liquid distribution and transport mechanisms involved in processes such as drying. Since they are built with rigid materials, phenomena such as shrinkage and matrix deformation can only be indirectly studied. A new method based on the traditional photolithographic technique has been developed to fabricate deformable micromodels. This technique uses an elastomeric material called polydimethylsiloxane (PDMS). This study describes the fabrication protocol for fabricating 3D deformable transparent PDMS micromodels with a log-normal pore size distribution and pore values ranging between 160 and 500 µm (µ = 200 µm and σ = 60 µm). This study provides preliminary results involving drying curves and shrinkage. PDMS micromodels are a useful tool to determine the liquid transport mechanism involved in drying and impregnation in porous structures that simulate a food matrix.



DOI: 10.5151/chemeng-cobeq2014-0006-27656-154433

Referências bibliográficas
  • [1] LAURINDO, J.B.; PRAT, M. Numerical and experimental network study of evaporation in capillary porous media. Phase distributions. Chem. Eng. Sci., v. 51 (23), p. 5171-5185, 1996.
  • [2] SANMARTIN, F.A., LAURINDO J.B.; SEGURA L.A. Pore-Scale simulation of drying of a porous media saturated with a sucrose solution. Drying Tech., v. 29, p. 873 – 887, 2011.
  • [3] OYARZÚN, C. A.; SEGURA, L.A. Design and construction of glass micromodels for the study of moisture transport in softwoods. Drying Tech., v. 27, p. 14-29. 2009 Área temática: Engenharia e Tecnologia de Alimentos 7BUCKLEY, J.S. Multiphase Displacement in Micromodels. In: MORROW, N. R. (Ed.). Interfacial phenomena in petroleum recovery. New York: Marcel Dekker Inc, 1991.
  • [4] ANDERSON, J.; CHIU, D.; JACKMAN, R.; CHERNIAVSKAYA, O.; McDONALD, J.; WU, H.; WHITESIDES, S.; WHITESIDES, G. Fabrication of topologically complete three-dimensional microfluidic systems in PDMS by rapid prototyping. Anal. Chem., v. 72, p. 3158-3164, 2000.
  • [5] DUFFY, D. C.; McDONALD, J. C.; SCHUELLER, O. J. A.; WHITESIDES, G. M. Rapid Prototyping of Microfluidic Systems in Poly(dimethylsiloxane). Anal. Chem., v. 70, p. 4974 – 4984, 1998.
  • [6] McDONALD, J.C.; DUFFY, D.C.; ANDERSON, J.R.; CHIU, D.T.; WU, H.; SCHUELLER, O.J.; WHITESIDES, G.M. Fabrication of Microfluidic Systems in Poly(dimethylsiloxane). Electrophoresis., v. 21, p. 27- 40, 2000.
  • [7] YOO, J. C.; MOON, M. C.; CHOI, Y. J.; KANG, C. J.; KIM, Y. S. A high performance microfluidic system integrated with the micropump and microvalve on the same substrate. Microelectro. Eng., v. 83, p. 1684-1687, 2006.
  • [8] STROOCK, A. D.; DERTINGER, S. K.; ADJARI, A.; MEZIC, I.; STONE, H. A.; WHITESIDES, G. M. Chaotic mixer for microchannel. Science., v. 295, p. 647-651, 2002 LOWDER, T. L.; GORDON, J. D.; SCHULTZ, S. M.; SELFRIDGE, R. H. Volatile organic compound sensing using a surface-relief D-shaped fiber Bragg grating and a polydimethylsiloxane layer. Opt. Lett., v. 32, p. 2523-2525, 2007.
  • [9] BRUIN, G. Recent developments in electrokinetically driven analysis on microfabricated devices. Electrophoresis., v. 21, p. 3931-3951, 2000.
  • [10] PARASHAR, S.; GIJS, V.; GIJS, M. Micro-replication of optical lenses in glass using a novel sol gel technology, Micro Electro Mechanical Systems. The Fifteenth IEEE International Conference on. MEMS., p. 516-519, 2002.
  • [11] REN, H.; FOX, D.; ANDERSON, P.; WU, B.; WU, S. Tunable-focus liquid lens controlled using a servo motor. Opt. Express., v. 14, p. 8031-8036, 2006.
  • [12] OYARZÚN, C. Distribución de Fluidos y Transporte de Humedad a Escala de Segmentos de Poro Durante el Secado Isotermal de Madera. Chile. Tesis (Magíster en Ciencia y Tecnología de la Madera)-Universidad del BíoBio, Concepción, 2008.
  • [13] KI-HUN, J.; JAEYOUN, K.; LEE, L. Biologically inspired artificial compound eyes. Science., v. 312(5773), p. 557- 561, 2006.
  • [14] KARATHANOS, V.; KANELLOPOULOS, N.; BELESSIOTIS, V. Development of Porous Structure During Air Drying of Agricultural Plant Products. J. of Food Eng., v. 29, p. 169-183, 1996.
Como citar:

SEGURA, L. A.; FUENTES, M. G.; URRUTIA, C. P.; BADILLO, G. M.; "3D PDMS TRANSPARENT MICROMODELS SIMULATING A FOOD MATRIX: MICROMODEL FABRICATION PROTOCOL AND PRELIMINARY DRYING EXPERIMENTS.", p. 2942-2949 . In: Anais do XX Congresso Brasileiro de Engenharia Química - COBEQ 2014 [= Blucher Chemical Engineering Proceedings, v.1, n.2]. São Paulo: Blucher, 2015.
ISSN 2359-1757, DOI 10.5151/chemeng-cobeq2014-0006-27656-154433

últimos 30 dias | último ano | desde a publicação