Fabrication and characterization of polymethyl methacrylate microchannel using dry and underwater CO2 laser

Mohamed O. Helmy, Ahmed M. R. Fath El-Bab, H. El-Hofy
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引用次数: 9

Abstract

Over the last few decades, miniaturization has become the key aspect of driving evolution of modern technology. The CO2 laser is an inexpensive, flexible, and fast device for fabricating microfluidic chips. Thermal damages associated with such a process are considered the big challenge for microfluidic device developers. This article evaluates the quality of polymethyl methacrylate microchannels fabricated by the CO2 laser. Experiments were conducted in the air (dry) and underwater by leaving a thin water layer on the top surface of the polymethyl methacrylate substrate. The effect of laser power and scanning speed on performance characteristics, such as the microchannel aspect ratio, surface roughness, and heat-affected zone was studied. Taguchi’s experimental design with grey relational analysis was used for multi-objective optimization of the laser micromachining parameters. Analysis of variance was also employed to determine the most significant control factors that affect the microchannel quality. The results indicated that the cooling effect of the underwater method has a significant effect on decreasing the extent of thermal damage while increasing the aspect ratio. Laser power is the most significant factor on the performance characteristics followed by scanning speed and pulse rate. Grey relational analysis is efficient in selecting the optimum conditions regarding the performance characteristics.
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干式和水下CO2激光制备聚甲基丙烯酸甲酯微通道及表征
在过去的几十年里,小型化已经成为推动现代技术发展的关键因素。CO2激光器是一种廉价、灵活、快速的微流控芯片制造设备。与此过程相关的热损伤被认为是微流体器件开发人员面临的最大挑战。本文对CO2激光制备的聚甲基丙烯酸甲酯微通道的质量进行了评价。实验是在空气(干燥)和水下进行的,在聚甲基丙烯酸甲酯基板的上表面留下一层薄薄的水层。研究了激光功率和扫描速度对微通道宽高比、表面粗糙度和热影响区等性能特性的影响。采用田口试验设计与灰色关联分析法对激光微加工参数进行多目标优化。方差分析还用于确定影响微通道质量的最显著控制因素。结果表明,水下方法的冷却效果对减小热损伤程度、增大展弦比有显著效果。激光功率是影响其性能的最重要因素,其次是扫描速度和脉冲速率。灰色关联分析可以有效地根据性能特征选择最优条件。
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来源期刊
CiteScore
6.00
自引率
1.70%
发文量
24
期刊介绍: Proceedings of the Institution of Mechanical Engineers Part N-Journal of Nanomaterials Nanoengineering and Nanosystems is a peer-reviewed scientific journal published since 2004 by SAGE Publications on behalf of the Institution of Mechanical Engineers. The journal focuses on research in the field of nanoengineering, nanoscience and nanotechnology and aims to publish high quality academic papers in this field. In addition, the journal is indexed in several reputable academic databases and abstracting services, including Scopus, Compendex, and CSA's Advanced Polymers Abstracts, Composites Industry Abstracts, and Earthquake Engineering Abstracts.
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