Numerical Optimization of Key Design Parameters of a Thermoelectric Microfluidic Sensor for Ultrasensitive Detection of Biochemical Analytes
| Autor: | Gergana G. Nestorova, Louis G. Reis, Saif Mohammad Ishraq Bari |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Fluid Flow and Transfer Processes
Analyte Materials science 010401 analytical chemistry Microfluidics General Engineering Nanotechnology 02 engineering and technology Heat sink 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Heat transfer Thermoelectric effect Key (cryptography) General Materials Science 0210 nano-technology Biosensor |
| Zdroj: | Journal of Thermal Science and Engineering Applications. 13 |
| ISSN: | 1948-5093 1948-5085 |
| DOI: | 10.1115/1.4047826 |
| Popis: | The design of highly sensitive thermoelectric microfluidic sensors for the characterization of biochemical processes is an important area of engineering research. This study reports the design and fabrication of a continuous-flow biosensor with an integrated thermopile and three-dimensional numerical analysis of the critical design parameters that significantly increase the detection sensitivity of the platform. The paper discusses the impact of volumetric flowrate, channel height, material thermal properties, and heat sink on the magnitude of the thermoelectric signal. In the platform understudy, the heat generated by the enzymatic reaction between glucose oxidase-conjugated antibody and glucose is converted to an electric output by an antimony-bismuth thin-film thermopile with a theoretical Seebeck coefficient of 7.14 µV mK−1. Since this experimental configuration has been implemented in a various biochemical analysis, particular emphasis in this work is maximizing the detection sensitivity of the device. Computational thermal modeling was performed to investigate the impact of channel height (50 µm, 100 µm, 150 µm, and 200 µm), the volumetric flow rate of the substrate (25 µL min−1 and 50 µL min−1), and the microdevice material (glass, PMMA, and PDMS) on the output of the thermoelectric sensor. Experimental data validated the model and provided an excellent correlation between the predicted and measured voltage output. Results show that fabricating the calorimeter out of materials with lower thermal diffusivity, reducing the channel height, and eliminating the heat sink at the reference junction of the thermopile increases the sensitivity of the platform by 783%. |
| Databáze: | OpenAIRE |
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