3D microstructures 1 Emulsification 1 Expensive equipments 1 Fabrication 1 Fluidic devices 1 Gray scale photolithography 1 Grayscale photolithography technique 1 Micro-fluidic devices 1 Microfluidics 1 Micromixer Microstructure 1 Mixers (machinery) 1 Mixing 1 Mixing performance 1 Multi-level structures 1 Negative photoresists 1 Photoresists 1 Serpentine 1 Simultaneous control 1 Three-dimensional (3D) microstructures 1 Vertical dimensions 1