Yong Zhu's blog

The ASME Multifunctional Materials Technical Committee of the Materials Division is organizing several topics related to Multifunctional Material Systems at IMECE2013 to be held in San Diego, CA, during Nov. 15-21, 2013 .

Abstract submission deadline: February 14, 2013

This paper reports the quantitative measurement of a full spectrum of mechanical properties of fivefold twinned silver (Ag) nanowires (NWs), including Young’s modulus, yield strength, and ultimate tensile strength. In-situ tensile testing of Ag NWs with diameters between 34 and 130 nm was carried out inside a scanning electron microscope (SEM). Young’s modulus, yield strength, and ultimate tensile strength all increased as the NW diameter decreased.

We systematically investigated the interesting electric response of the aligned CNT ribbons under mechanical strain. We found that CNTs slide on a PDMS substrate under tension, but buckle under compression (releasing). Such an irreversible mechanical deformation is responsible for the observed irreversibility in the electric resistance upon the first stretching/releasing.

A postdoctoral research position is available in Dr. Yong Zhu’s lab in the Department of Mechanical and Aerospace Engineering at North Carolina State University. We are looking for a self-motivated researcher to work on projects involving mechanics of nanostructures including nanowires and nanotubes. A Ph.D. in Mechanical Engineering, Materials Science and Engineering, Physics or a related area is required. Experience with in-situ nanomechanical testing using SEM, TEM, AFM or Raman are desirable.

F.Xu, W. Lu and Y. Zhu, ACS Nano, 2011, 5 (1), pp 672–678.

An interview by ACS Nano (Episode 42: January 2011),

http://pubs.acs.org/page/ancac3/audio/index.html

In this paper that was published a few months ago, we reported the size effects on the elastic modulus and fracture strength of silicon nanowires. In addition, we observed that the silicon nanowires are linear elastic until fracture with a very large fracture strain up to 12%.



Y. Zhu, F. Xu, Q. Qin, W. Y. Fung, and W. Lu, Nano Letters 9, 3934-3939, 2009



Abstract:

The 2nd International Conference on Advanced Computational Engineering and Experimenting, ACE-X2008

Barcelona, Spain, July 14-15, 2008.



For more information, please check the ACE-X2008 website www.ace-x2008.com <http://www.ace-x2008.com/&gt;