Impact of Droplets on Surfaces Designed with Wettability-Gradient Properties: Directional Migration, Oblique Rebound, and Reduced Contact Time.

Efficiently regulating the rebound behavior of droplets post-impact is crucial for various fields, mainly including the development of self-cleaning applications, the design of surface functional materials, and the advancement of industrial techniques. By performing molecular dynamics simulations, we investigated the impact and jumping behavior of droplets on heterogeneous substrates with different wetting regions. We found that, during the impacting evolution process, the retracted droplets would move toward regions with stronger wettability due to the unbalanced force caused by the wettability difference, revealing the directional migration ability. The values of the wettability difference strongly affect the degree of oblique rebound and contact time when droplets can jump off the substrate. We then designed the surfaces with a wettability gradient and found that the oblique rebound angle could be well controlled and the contact time further reduced. Our findings may provide valuable insight into the relationship between the wettability gradient and the behavior of liquid droplets on surfaces, with broad implications for various fields such as surface engineering, materials science, microfluidics, etc.

[Observation on therapeutic effect of tendon-muscle picking therapy on myofascitis of back].

OBJECTIVE: To observe clinical therapeutic effect of tendon-muscle picking therapy on myofascitis of back. METHODS: One hundred and twelve cases were randomly divided into a tendon-muscle picking therapy group and an electroacupuncture (EA) group, 56 cases in each group. The tendon-muscle picking therapy group were treated by picking pain tendon-muscle tubercles on the back, and the EA group by EA at Dazhu (BI. 11), Feishu (BL 13), Xinshu (BL 15), Tianzong (SI 11) and Jiaji (EX-B 2). Their therapeutic effects were compared after treatment for 2 courses. RESULTS: The total effective rate was 89.3% in the tendon-muscle picking therapy group and 78.6% in the EA group with a significant difference between the two groups (P<0.05). CONCLUSION: Tendon-muscle picking therapy has a good therapeutic effect on myofascitis of back.