We proposed a thermal engraving technology based on heat transfer theory and polymer\nrheology in microfluidic field. Then, we established a 3D model of the thermal engraving process\nbased on polymethyl methacrylate (PMMA) material. We could employ the model to analyze\nthe influence of temperature and speed on microchannel processing through the finite element\nsimulation. Thus, we gained the optimal processing parameters. The orthogonal experiments were\ncarried out within the parameter ranges obtained by the simulation results. Finally, we fabricated the\nsmooth microchannel, the average roughness of which was 0.3 �¼m, by using the optimal parameters.\nFurthermore, we examined the surface morphology and wettability. Our work provides a convenient\ntechnological support for a fast, low-cost, and large-scale manufacturing method of microfluidic chips.
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