초발수성 마이크로 포어에서 액적 충돌 기반의 마이크로 액적 생성

다국어 초록 (Multilingual Abstract)

When an aqueous liquid drop is impinged on a superhydrophobic porous surface, the liquid penetration may occur in the form of a liquid jet or micro droplets depending on an impact velocity. Here by impacting a liquid drop on a superhydrophobic surface with a single micro pore, we demonstrate that it is possible to dispense a single micro drop of a controlled size in a reproducible way, while proposing the impact condition (i.e., impact velocity) under which a single micro droplet is generated, as a function of a micro pore size and a liquid viscosity. It is found that a larger impact velocity is required to generate a single micro drop as a micro pore size decreases, while an impact velocity for a single micro drop generation appears to be rather insensitive to the liquid viscosity. Also, the diameter of micro drop is found to be roughly 1.5 times of the diameter of micro pore for all tested pore sizes, such that about 75 μm-diameter micro droplet is obtained with a 50 μm-diameter micro pore. As an application example, we demonstrate the successful printing of an array of micro droplets on a paper. We believe that the present approach can be a simple and effective strategy to micro droplet printing without the typical issues associated with droplet printing, such as clogging or satellite droplet generation.

목차 (Table of Contents)

• Abstract
• 1. 서론
• 2. 실험 결과
• 3. 결론
• 참고문헌