Novel Capillary Effect in a Curled Open Capillary Tube

Capillary action in microchannels, a well-established phenomenon, plays a significant role in various applications, such as the extraction of reagents and heat dissipation. However, multilevel microstructures on the inner wall are often required to achieve flexible capillary effect in thin tubes, and their performance is frequently hindered by the presence of bubbles. Modulating capillary behavior by relying on a simple structural design alone remains a challenge. In this study, a curled open ca