Li Qunyang

Email: qunyang@tsinghua.edu.cn    

Tel: +86-10-62771619 (office)

Mail: Dept. of Engineering Mechanics, School of Aerospace, Tsinghua University, Beijing, 100084  P.R. China 

 

 

EDUCATION  

Brown University, Providence, RI

Ph. D. in Engineering, May 2008

Dissertation: “Micromechanics of pseudo-single-asperity friction: effects of nanometer-scale roughness.”

Advisor: Kyung-Suk Kim

Sc. M. Applied Mathematics, May 2007

Tsinghua University, Beijing, China

Sc. M. Engineering Mechanics, 2003

Thesis: “Mechanics studies of micro- adhesive contact and instability of thin films.”

Advisor: Shouwen Yu

Sc. B. Engineering Mechanics, 2001 

HONORS & AWARDS   

.Thousand Young Talents Program, the Central Coordination Committee on the Recruitment of Talents, the Organization Department of the CPCCC, 2011.

.The Outstanding Thesis Award, for the best Ph.D. thesis (one recipient per year), Division of Engineering, Brown University, 2008.

.William N. Findley Award, for the best graduate student paper on the “Mechanical Behavior of Materials” (one recipient per year), Division of Engineering, Brown University, 2006.

.James R. Rice Graduate Fellowship, academic award for first-year graduate student (one recipient per year), Division of Engineering, Brown University, 2003.

.Dean’s Fellowship, Graduate School, Brown University, 2003.

.Outstanding Thesis Award, for the best master’s thesis (top 5%), Tsinghua University, 2003.

.Outstanding Master Graduate Student, for the best master graduate student (one recipient per year), Department of Engineering Mechanics, Tsinghua University, 2003.

.Honorable Excellent Graduate Scholarship, First Class, Tsinghua University, 2002.

.Consecutive scholarships for excellent undergraduate students, Tsinghua University, 1998-2000.

RESEARCH EXPERIENCE  

Associate Professor, Department of Engineering Mechanics, School of Aerospace, Tsinghua University, 2012-now

Research Scientist, NanoTribology Laboratory, University of Pennsylvania, 2010-2012

Postdoctoral Researcher, NanoTribology Laboratory, University of Pennsylvania, 2008-2010

.Mechanical characterization of atomically-thin materials: using atomic force microscope (AFM) to characterize the mechanical properties of atomically-thin films, e.g. graphene (single-atomic-layer graphite); explore the unique mechanical deformation and energy dissipation mechanisms when two-dimensional materials interact with their surroundings.

.Fundamental study of nano-scale friction: experimentally measure atomic stick-slip motion on crystalline metal surfaces using AFM; collaborate with theoretical and computational modelers to understand the energy dissipation mechanisms that govern nanometer-scale contact sliding.

.Mechanism-based study of rate and state friction: develop experimental protocols to measure the rate-dependent adhesion and friction between silica surfaces at single-asperity level; identify the physical and chemical factors that contribute to the rate effect in macroscopic frictional behaviors.

Research Assistant/Associate, Nano and Micro Mechanics Laboratory, Brown University, 2003-2008

.Friction at the nano and micrometer scale: invented a novel device for quantitative force measurement using AFM; experimentally discovered a new type of contact behavior between nanoscopically-rough yet microscopically-smooth surfaces; developed a hierarchical mechanics model to incorporate multi-scale roughness effect in frictional processes.

.Scale bridging of interface adhesion: experimentally investigated the adhesion enhancement of polymer interfaces by changing the morphologies; developed a homogenized model to characterize the effective adhesion property for slightly undulated interfaces.

.Lubrication mechanism of lubricin protein from synovial fluid in human body joints: physically and chemically adsorbed lubricin protein to various substrates; measured the variations of inter-surface adhesion and friction due to the protein adsorption; provided key experimental evidences for mechanics modeling.

Research Assistant, Key Laboratory of Failure Mechanics, Tsinghua University, China, 2001-2003

.Finite element study of elasto-plastic contact considering adhesion; and simulation of buckling and delamination of thin films under indentation.

.Modeling of three-dimensional pattern instability of soft elastic films under van der Waals forces.

RESEARCH INTERESTS  

Understanding how surfaces interact at small scales and bridging the nano-scale intrinsic properties to macro-scale behaviors/properties through experiments and mechanics modeling. Specifically: 

.understanding mechanical behavior of novel materials, especially their friction, adhesion and wear properties at small scales;

.quantitatively studying how nano-scale material properties affect surface interactions at multiple length scales and/or under complex conditions; 

.developing new experimental protocols and instruments to better characterize mechanical/tribological behavior at different length scales;

.mechanism-based multi-scale modeling of tribological behavior. 

OTHER PROFESSIONAL ACTIVITIES  

Member of  

.Society of Engineering Science (SES)

.Society of Tribologists and Lubrication Engineers (STLE); secretary of Young Tribologists Committee

.American Geophysical Union (AGU)

.American Physical Society (APS)

Editorial board member of Review of Scientific Instruments

Reviewer for  

Carbon, Journal of Materials Science, Journal of Micromechanics and Microengineering, Journal of Physics D: Applied Physics, Journal of Physics: Condensed Matter, Modelling and Simulation in Materials Science and Engineering, Nano Letters, Nanotechnology, Physical Review B, Physical Review Letters, Review of Scientific Instruments 

PUBLICATIONS (PEER-REVIEWED JOURNALS)

.Li, Q., Tullis, T.E., Goldsby, D. & Carpick, R.W. 2011 Frictional ageing from interfacial bonding and the origins of rate and state friction. Nature, 480 (7376), 233-236 / doi: 10.1038/nature10589.

*** This work has been highlighted by ScienceDaily, Society of Chemistry, MyScience, PhysOrg, Physics World, Eurekalert, PennMedia, ChinaDaily, iFeng among others.

.Liu, X. Z, Li, Q., Lee, C. Zhang, B. Hone, J. & Carpick, R.W. 2011 Nanoscale friction and adhesion behavior for few-layer graphene. Tribology & Lubrication Technology, 67(11), 12-14.

.Li, Q., Dong, Y., Martini, A. & Carpick, R.W. 2011 Atomic friction modulation on the reconstructed Au (111) surface. Tribology Letters, 43(3), 369-378 / doi: 10.1007/s11249-011-9824-4.

.Dong, Y., Li, Q., Wu, J. & Martini, A. 2011 Friction, slip and structural inhomogeneity of the buried interface. Modelling and Simulation in Materials Science and Engineering, 19, 065003 / doi: 10.1088/0965-0393/19/6/065003.

.Dong, Y., Martini, A., Li, Q., & Carpick, R.W. 2011 Atomic friction studied by modeling the buried interface. Tribology & Lubrication Technology, 67(5), 17-19. 

.Yang, L., Chinthapenta1, V., Li, Q., Stout, D., Liang, A., Sheldon, B.W. & Webster, T.J. 2011 Understanding osteoblast responses to stiff nanotopographies through experiments and computational simulations. Journal of Biomedical Materials Research Part A, 97A (4), 375-382 / doi: 10.1002/jbm.a.33094.

.Li, Q., Dong, Y., Perez, D., Martini, A. & Carpick, R.W. 2011 Speed dependence of atomic stick-slip friction in optimally matched experiments and molecular dynamics simulations: The role of dynamics vs. energetics. Physical Review Letters, 106, 126101 / doi: 10.1103/PhysRevLett.106.126101.

*** This paper was chosen as Editors’ Suggestion.

.Li, Q., Lee, C., Carpick, R.W. & Hone, J. 2010 Substrate effect on thickness-dependent friction on graphene. Physica Status Solidi B. 247(11-12), 2909-2914 / doi: 10.1002/pssb.201000555.

.(Lee, C., Li, Q.), Kalb, W., Liu, X., Berger, H., Carpick, R.W. & Hone, J. 2010 Frictional characteristics of atomically-thin sheets. Science, 328(5974), 76-80 / doi: 10.1126/science.1184167.

*** Lee, C. and Li, Q. contributed equally to this paper.

*** This work has been highlighted by Nature Nanotechnology, Materials Research Society, The American Ceramic Society, The Society of Tribologists and Lubrication Engineers, ScienceDaily, PhysOrg, Futurity, PennMedia among others.

.Li, Q. & Kim, K.-S. 2009 Micromechanics of rough surface adhesion: a homogenized projection method. Acta Mechanica Solida Sinica, 22(5), 377-390 / doi: 10.1007/s10338-009-0901-2.

.Lee, C., Wei, X., Li, Q., Carpick, R.W., Kysar, J.W. & Hone, J. 2009 Elastic and frictional properties of graphene. Physica Status Solidi B, 246(11-12), 2562-2567 / doi: 10.1002/pssb.200982329.

.Li, Q. & Kim, K.-S. 2008 Micromechanics of friction: effects of nanometer-scale roughness. Proceedings of the Royal Society A, 464(2093), 1319-1343 / doi: 10.1098/rspa.2007.0364.

.Li, Q., Kim, K.-S. & Rydberg, A. 2006 Lateral force calibration of an atomic force microscope with a dia- magnetic levitation spring system. Review of Scientific Instruments, 77, 065105 / doi: 10.1063/1.2209953. 

*** This article was selected for the June 15, 2006 issue of Virtual Journal of Biological Physics Research and June 26, 2006 issue of Virtual Journal of Nanoscale Science & Technology. Both virtual journals are published by the American Institute of Physics and the American Physical Society in cooperation with numerous other societies and publishers; they can be accessed at http://www.vjbio.org and http://www.vjnano.org.

.Huang, S., Li, Q., Feng, X. & Yu, S. 2006 Pattern instability of a soft elastic thin film under van der Waals forces. Mechanics of Materials, 38, 88-99 / doi: 10.1016/j.mechmat.2005.05.012.

.Li, Q. & Yu, S. 2004 A model for computational investigation of elasto-plastic normal and tangential contact considering adhesion effect. Acta Mechanica Sinica, 20, 165-171 / doi: 10.1007/BF02484261.

.Li, Q. & Yu, S. 2002 A model of computation of elastic and plastic contact considering adhesion effect. International Journal of Nonlinear Sciences and Numerical Simulation, 3(3-4), 599-602.  

CONFERENCE AND INVITED TALKS/POSTERS

.Li, Q., Goldsby, D., Tullis, T.E. & Carpick, R.W. 2011 On the origins of rate and state friction: Frictional ageing of rock materials explored via single-asperity experiments (poster presentation), Future Directions in Mechanics Research: NSF Workshop and Symposium in honor of Professor L. B. Freund,Providence, Rhode Island.

*** The poster was awarded Third Prize for the poster session competition.

.Li, Q., Carpick, R.W., Dong, Y. & Martini, A. 2011 Atomic stick-slip friction studied by optimally-matched experiments and simulations, 66th Annual Meeting, Society of Tribologists & Lubrication Engineers, Atlanta, Georgia.

.Li, Q., Carpick, R.W., Goldsby, D. & Tullis, T.E. 2011 A physical basis for frictional ageing using single-asperity measurements, American Physical Society March Meeting 2011, Dallas, Texas.

*** Li, Q. also served as the Chair for Session-H14: Friction, Fracture and Deformation Across Length Scales I: Sliding Friction and Asperities.

.Li, Q. 2011 Frictional strength of materials: From atomically-thin sheets to tectonic plates, Invited talk, Northwestern University, Illinois.

.Li, Q., Bares, J. & Carpick, R.W. 2010 Nanomechanics at interfaces: Friction, adhesion, lubrication and wear at the nanometer scale, Philadelphia Section Meeting, Society of Tribologists & Lubrication Engineers, Lafayette Hill, Pennsylvania.

.Li, Q. 2010 Frictional characteristics of atomically-thin sheets: Thick can be slick, Invited talk, Workshop: Success Strategies for Emerging Faculty, The University of Delaware, Newark, Delaware.

.Li, Q., Carpick, R.W., Dong, Y. & Martini, A. 2010 Quantitative study of atomic-scale stick-slip friction: experiment, 65th Annual Meeting, Society of Tribologists & Lubrication Engineers, Las Vegas, Nevada.

.Li, Q. 2010 Friction on the small scales: measuring, understanding, and predicting, Invited talk, University of Illinois at Urbana-Champaign, Illinois.

.Li, Q. 2009 Probing the mechanisms of friction with atomic force microscopy, Invited talk, Jinan University, Guangzhou, Guangdong, China.

.Li, Q., Carpick, R.W., Goldsby, D. & Tullis, T.E. 2009 Probing the mechanisms of rock friction at the nanometer scale with atomic force microscopy, American Geophysical Union 2009 Fall Meeting, San Francisco, California.

.Li, Q. 2009 From the atomic to the tectonic: nano-scale friction and earthquake. NanoTalk, University of Pennsylvania, Philadelphia, Pennsylvania.

.Li, Q., Carpick, R.W., Lee, C. & Hone, J.C. 2009 Quantitative experimental study of atomic-scale stick-slip friction. 64th Annual Meeting, Society of Tribologists & Lubrication Engineers, Orlando, Florida.

.Li, Q., Kim, K.-S. & Rydberg, A. 2008 Quantitative measurement for lateral force microscopy: a diamagnetic-levitation spring system. 45th Annual Technical Meeting, Society for Engineering Science, University of Illinois at Urbana-Champaign, Illinois.