IntroductionBorn in March 1970, he holds a Ph.D. in Science and is currently an associate professor. He graduated from the School of Engineering Mechanics at Chongqing University in 1993 and worked at the 11th Research Institute of the 067 Base in the Aerospace Industry from 1993 to 1998. In 2001, he completed a Master’s degree in Solid Mechanics at Beijing Jiaotong University and subsequently began a Ph.D. in Mechanics at the Institute of Mechanics, Chinese Academy of Sciences. During his doctoral studies, he served as a visiting scholar at the Hong Kong University of Science and Technology from 2004 to 2005. In July 2006, he joined Beijing University of Chemical Technology. Later, from May 2013 to May 2014, he was a visiting scholar at the Technical University of Darmstadt, Germany. EducationWork ExperienceSocial PositionSocial ActivitiesResearchResearch area 1) Effect of microscale adhesion contact and liquid bridge on contact hysteresis The team has been extensively engaged in theoretical and experimental research on micro- and nano-contact mechanics, with an experimental platform primarily centered on AFM. Our work includes in-depth theoretical analysis of adhesive contact and energy dissipation in micro- and nanocontact mechanics, as well as scratch, friction, and wear experiments on carbon nanotube-reinforced polymers using AFM and other nanoindentation tools. Through these studies, we have proposed corresponding enhancement mechanisms. We have also experimentally investigated the velocity effects on AFM force measurements under atmospheric conditions, arriving at conclusions that differ from those found in vacuum environments. Additionally, we conducted both experimental and theoretical analyses on the formation of liquid bridges near the AFM needle tip, drawing significant attention from scholars worldwide upon publication. This work sparked international debate, with European and American scholars discussing the mechanism of liquid bridge formation. Notably, one side of the debate referenced two of the applicant's papers to support their arguments, specifically regarding the time-dependent nature of AFM liquid bridge formation. Professor Butt, the director of the Max Planck Institute for Polymer Research and an international authority on AFM in Germany, has cited the applicant’s experimental and theoretical contributions multiple times. Relevant publications are available in the applicant's profile. 2) Dynamic processes of liquid bridge generation and breakage and their effects on AFM imaging The problem is first analyzed and explored theoretically, with particular attention to contact issues occurring on the microsecond scale. This involves calculating the characteristic times for three key mechanisms of liquid bridge formation. For the experimental study of liquid bridge dynamics, a swept-frequency approach is employed. Liquid bridges are a significant cause of image distortion in atomic force microscopy (AFM) under atmospheric conditions and contribute substantially to adhesion in such environments. Thus, understanding liquid bridge dynamics is essential for insights into imaging mechanisms and sample properties. Effect of Ambient Humidity on AFM Scanning Morphology In terms of theory, this investigation centers on the relationship between capillary forces and probe-sample distance, examining how fracture energy varies with relative humidity and contact angle. By integrating the liquid bridge into a vibrational model, vibration theory is applied to identify variations in the height and phase of probe samples under constant excitation amplitude. Experimentally, sample surfaces are prepared with gradient contact angles, and humidity levels are adjusted to capture height and phase images at each setting, allowing for direct comparison with theoretical predictions.Study of Pressure Film Damping on AFM Vibration Characteristics When the AFM operates in tapping mode, the effect of air pressure film damping becomes more pronounced as the probe tip approaches the sample. To investigate how pressure film damping influences the AFM’s vibrational system, frequency-sweeping experiments are conducted using a pinless tip probe and a microsphere tip probe, respectively. Using vibration theory, these experiments provide simplified models of system stiffness for both probes. The microsphere tip vibration model is further reduced to a one-dimensional oscillator, allowing for an in-depth analysis of the impact of pressure film damping. Findings confirm that the air pressure film damping model accurately captures microscale interactions between the probe and sample, offering valuable insights into tapping mode dynamics in AFM. Research projects hosted
TeachingAs the Director of the Basic Mechanics Teaching and Research Department at the School of Electromechanical Engineering, Beijing University of Chemical Technology, he teaches undergraduate courses in theoretical mechanics, mechanics of materials, engineering mechanics, and mechanical fundamentals, as well as a postgraduate course in vibrational mechanics. Over the past three years, he has conducted 584 hours of classroom instruction, averaging 195 hours per year. He has led several teaching reform initiatives, including:
In addition, he has organized and mentored both undergraduate and postgraduate students for the National Zhou Peiyuan Undergraduate Mechanics Competition, achieving the Excellence Award (Individual Competition) in the 12th competition. PostgraduatesFundingVertical ProjectHorizontal ProjectPublicationsTwo papers in JCR1 region of Chinese Academy of Sciences, one paper in CiteScore partition 1 region, the paper has 241 SCI citations, the highest single citation 109 times, the highest single citation 33 times in the last 3 years.
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