Dr. Xian Ping Liu Profile

Dr. Xian Ping Liu

Associate Professor at Univ of Warwick

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Publications (3)

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Proceedings Article | 6 March 2015 Paper

Generation of stainless steel superhydrophobic surfaces using WEDM technique

Yanling Tian, Xianping Liu, Houjun Qi

Proceedings Volume 9446, 94464G (2015) https://doi.org/10.1117/12.2181976

KEYWORDS: Electrodes, Aluminum, Scanning electron microscopy, Metrology, Metals, Solids, Silicon, Copper, Dielectrics, Iron

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This paper presents a novel fabrication methodology for generating superhydrophobic surfaces on stainless steel. The Wire Electric Discharge Machining (WEDM) technique was utilized to change the wettability of stainless steel which is generally hydrophilic. Superhydrophobic surfaces were obtained on the stainless steel by strictly control the machining progress. The mechanism of wettability modulation was explored using the well-established surface metrology and characterisation instruments. It was noted that WEDM can be used to generate a recast layer on stainless steel surface. There was a number of hierarchic micro-structures in the irregular recast layer and the number of micro-holes increases the contact area between the water drop and the top surface of stainless steel. Thus, the contact angle was significantly increased and the wettability of stainless steel changed from hydrophilic into hydrophobic. Compared with other established fabrication approaches, the stainless steel based hydrophobic surface can provide long durability, high efficiency and low cost metallic surfaces, which paves the way for the practical applications of stainless steel hydrophobic surfaces in the academic and engineering fields.

Proceedings Article | 31 December 2010 Paper

Sensitive elastic modulus mapping of micro-structured biomaterials

J. Y. Sun, X. Liu, J. Tong, Z. Y. Yue

Proceedings Volume 7544, 754448 (2010) https://doi.org/10.1117/12.885209

KEYWORDS: Erbium, Minerals, Electroluminescence, Microscopes, Neodymium, Biomimetics, Diamond, Sensors, Proteins, Mode conditioning cables

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In nature, insects and plants have evolved ways of living and reproducing themselves using the least amount of resource. This involves both efficiency in metabolism and optimal mechanisms and materials for life functions. Human beings have long tried to learn from and mimic nature. The study of biological materials has received increasing interest in recent years due to the often extraordinary mechanical properties and unusual structures exhibited by these materials. Micro-structure biomaterials exhibit important local variations of elasticity due to the complex and anisotropic composition. In this paper, a specially developed multi-function tribological probe microscope (TPM) has been used to map the mechanical properties of some special micro-structured biomaterials. Results of the mapped surface topography and elastic modulus on specimens of elytra cuticle of dung beetle, nacre of shell and bovine horn have shown some significant lateral variations of elasticity across the surface area.

Proceedings Article | 12 January 2009 Paper

A multi-function tribological probe microscope with a hot tip for thermal measurement

Z. Yue, X. Liu, Z. Cai, P. Cai

Proceedings Volume 7133, 71334L (2009) https://doi.org/10.1117/12.810479

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Surface mechanical and thermal properties objectively affect our touch-feel perception. However, it is still far from known that how the surface properties affect the stimulus to our nerve system and make us feel warm or cold, hard or soft, rough or smooth, etc. Physically, although the surface properties can be measured individually by different instruments, it is desirable to have a multifunctional instrument to facilitate the investigation of the relationship between the surface physical characteristics and the corresponding perceived touch feeling by human. In our previous work, a novel multi-functional tribological probe microscope (TPM) was developed to provide mappings of four functions of a surface at micro and nanometer scales. The four functions of surface topography, hardness, Young's modulus and friction are measured in a single scan set-up and they are potentially linked in space and time to provide cross-correlation in between. In this paper, to achieve the additional function of micro thermal analysis, we proposed a new scheme of thermal probe with a hot wire (Wollaston wire) buried beneath a Berkovich diamond indenter. The details of mechanical design and associated electronic circuits are presented. Meanwhile, the paper also explains the principle of the hot-tip technique by relating its signals to established physical parameters of materials, a method that separates sample information from the artifact caused by the indentation geometry of the diamond tip. Experimental results of thermal conductivity measurements on certain metal specimens are discussed.

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