TABLE I.

Comparison and characteristics of drop-based microfluidic technologies.

Applied technique	Device material	Large-scale production	Advantages	Disadvantages	Reference
Micro-capillary assembly	Glass	Poor	•Good solvent resistance •Precision flow control	•Complex fabrication process •Limited device geometry	20 and 22
Photo/soft-lithography	Polydimethylsiloxane (PDMS)	Good	•Good flexibility •High reproducibility	•Poor solvent resistance •Difficult wettability control	41 and 42
3D printing	PEG diacrylate methacrylate photoresist	Excellent	•Rapid prototyping •Microfluidic kit automation	•Surface roughness •Low resolution channel	46 and 47