下降(电信)
咖啡环效应
胶体
竞赛(生物学)
材料科学
纳米技术
颗粒沉积
沉积(地质)
胶粒
直线(几何图形)
粒子(生态学)
复合材料
化学工程
工程类
电气工程
数学
生物
生态学
几何学
航程(航空)
古生物学
沉积物
作者
Xiulun Yang,Christopher Y. Li,Ying Sun
出处
期刊:Soft Matter
[The Royal Society of Chemistry]
日期:2014-01-01
卷期号:10 (25): 4458-4463
被引量:32
摘要
Deposition morphologies of inkjet-printed colloidal drops are examined under various drying conditions, particle volume fractions, and particle sizes. Concentric multi-rings, radial spokes, spider web, foam, and island-like depositions are observed as a result of the competition between the receding contact line and particle deposition during drop drying. Experimentally measured multi-ring spacing, δR, shows good agreement with the model predicted linear correlation with the local ring radius R. The results also show that the instability near the contact line leads to the radial spoke and saw-toothed structures. The resulting wavelength of the radial structures, λ, satisfies λ ~ (3)√R and λ ~ 1/(3)√[1-RH], where RH is the relative humidity. A dimensionless parameter ξ, defined as the radial deposition growth rate to contact line velocity ratio, has been identified to determine the conditions under which the entire contact line can be pinned to leave a continuous ring deposit. Increasing the particle size while keeping the volume fraction the same is found to suppress the formation of the multi-ring deposition, due to a smaller number of particles available to pin the receding contact line.
科研通智能强力驱动
Strongly Powered by AbleSci AI