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您的检索式：作者名="YeeCheong Lam"
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| 1 | Femtosecond laser-induced surface wettability modification of polystyrene surface显示文摘In this paper, we demonstrated a simple method to create either a hydrophilic or hydrophobic surface. With femtosecond laser irradiation at different laser parameters, the water contact angle (WCA) on polystyrene’s surface can be modified to either 12.7° or 156.2° from its original WCA of 88.2°. With properly spaced micro-pits created, the surface became hydrophilic probably due to the spread of the water droplets into the micro-pits. While with properly spaced micro-grooves created, the surface became rough and more hydrophobic. We investigated the effect of laser parameters on WCAs and analyzed the laser-treated surface roughness, profiles and chemical bonds by surface profilometer, scanning electron microscope (SEM) and X-ray photoelectron spectroscopy (XPS). For the laser-treated surface with low roughness, the polar (such as C—O, C=O, and O—C=O bonds) and non-polar (such as C—C or C—H bonds) groups were found to be responsible for the wettability changes. While for a rough surface, the surface roughness or the surface topography structure played a more significant role in the changes of the surface WCA. The mechanisms involved in the laser surface wettability modification process were discussed. | Bing Wang XinCai Wang HongYu Zheng YeeCheong Lam | 2016 | Science China(Physics,Mechanics & Astronomy)2016，59，12： | 1 |
| 2 | Numerical Analysis of Residual Stress in Hot-Rolled Steel Strip on the Run-Out Table显示文摘 | ZHOU Zhong-qing Thomson Peter F Lam YeeCheong | 2003 | Journal of Materials Processing Technology2003，132，： | 1 |
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