Figure 1

3D schematic images for (A) the macro-scale and (B) micro-scale MFCs. Images and dimensions of (C) the macro-scale and (D) micro-scale MFCs. (A) and (B) show the inlet and outlet, respectively. The scale is millimeter. The used poly (methyl methacrylate) (PMMA) sheets were produced by Cho Chen Industry Co. LTD, Taiwan. The spiral path of the microchannel was drawn by AutoCAD and the file was exported to the laser machine (Non-Metal Laser Cutting Machine, Model CMA1390-LG, GD Han’s Yueming Laser Group Co., LTD). (AutoCAD 2015, URL: https://www.autodesk.com/products/autocad/).