| Full text | |
| Author(s): |
Lima, Renato Sousa
[1, 2, 3]
;
Gomes Carneiro Leao, Paulo Augusto
[1, 3]
;
Monteiro, Alessandra Maffei
[1, 3]
;
de Oliveira Piazzetta, Maria Helena
[2]
;
Gobbi, Angelo Luiz
[2]
;
Mazo, Luiz Henrique
[1]
;
Carrilho, Emanuel
[1, 3]
Total Authors: 7
|
| Affiliation: | [1] Univ Sao Paulo, Inst Quim Sao Carlos, BR-13566590 Sao Carlos, SP - Brazil
[2] Ctr Nacl Pesquisa Energia & Mat, Lab Nacl Nanotecnol, Campinas, SP - Brazil
[3] Inst Nacl Ciencia Tecnol Bioanal, Campinas, SP - Brazil
Total Affiliations: 3
|
| Document type: | Journal article |
| Source: | ELECTROPHORESIS; v. 34, n. 20-21, p. 2996-3002, NOV 2013. |
| Web of Science Citations: | 8 |
| Abstract | |
In this communication, we describe the fabrication and electric characterization of a hybrid glass/SU-8 microchannels for high-performance electrokinetic applications. The bonding process employed SU-8 film as intermediate layer with reduced baking times; all the procedure took less than 50 min (only about 10 min disregarding the cleaning and dehydration steps). Additionally, further steps to improve the adhesion of the substrate to the SU-8 were not needed. The developed configuration aggregates the advantages of both substrates, including (i) simple fabrication techniques; (ii) high compatibility for integration of microelectromechanical, optical, and electrochemical components (SU-8); (iii) high and stable electroosmotic mobility ((EO)); and (iv) satisfactory heat dissipation capacity (glass). Electroosmotic mobilities were measured as a function of the pH using the current monitoring method, whereas the heat dissipation capacity was investigated through Ohm's law plots for both glass and glass/SU-8 microchips. The measured (EO) values were similar for both microdevices, with mobilities of the order of 4.0-4.5 x 10(-4)cm(2) V(-1)cm(-1) at 4-12 pH range using phosphate buffer (10 and 20mmol/L). The heat dissipation assays were carried out in microchannels filled with 20mmol/L phosphate buffer. A considerable Joule heating was observed only at electric field strengths greater than 580 V cm(-1) in hybrid glass/SU-8 microdevices, representing a substantial increase of 48% when compared to all SU-8 microdevices. (AU) | |
| FAPESP's process: | 10/08559-9 - Ultrasensitive electrochemical microfluidic systems |
| Grantee: | Renato Sousa Lima |
| Support Opportunities: | Scholarships in Brazil - Doctorate |