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Type: Artigo de periódico
Title: Polyurethane from biosource as a new material for fabrication of microfluidic devices by rapid prototyping
Author: Piccin, E
Coltro, WKT
da Silva, JAF
Neto, SC
Mazo, LH
Carrilho, E
Abstract: This paper presents the use of elastomeric polyurethane (PU), derived from castor oil (CO) biosource, as a new material for fabrication of microfluidic devices by rapid prototyping. Including the irreversible scaling step, PU microchips were fabricated in less than I It by casting PU resin directly on the positive high-relief molds fabricated by standard photolithography and nickel electrodeposition. Physical characterization of microchannels was performed by scanning electron microscopy (SEM) and profilometry. Polymer surface was characterized using contact angle measurements and the results showed that the hydrophilicity of the PU surface increases after oxygen plasma treatment. The polymer surface demonstrated the capability of generating an electroosmotic flow (EOF) of 2.6 x 10(-4) CM2 V-1 s(-1) at pH 7 in the cathode direction, which was characterized by current monitoring method at different pH values. The compatibility of PU with a wide range of solvents and electrolytes was tested by determining its degree of swelling over a 24 h period of contact. The performance of microfluidic systems fabricated using this new material was evaluated by fabricating miniaturized capillary electrophoresis systems. Epinephrine and L-DOPA, as model analytes, were separated in aqueous solutions and detected with end-channel amperometric detection. (c) 2007 Elsevier B.V. All rights reserved.
Subject: microfluidic devices
castor oil
rapid prototyping
microchip electrophoresis
Country: Holanda
Editor: Elsevier Science Bv
Citation: Journal Of Chromatography A. Elsevier Science Bv, v. 1173, n. 41671, n. 151, n. 158, 2007.
Rights: fechado
Identifier DOI: 10.1016/j.chroma.2007.09.081
Date Issue: 2007
Appears in Collections:Unicamp - Artigos e Outros Documentos

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