Physics Colloquium: Cheng Zhu ( LLNL)

Date: 
April 22, 2016 - 10:30am

Title: Three-dimensional printing of graphene-based composite aerogels

Graphene-based composite materials have found wide applications in nanoelectronics, sensors, catalysis, energy storage, and biomedicine areas for their unique combination of low density, exceptional mechanical properties, large surface area, and excellent electrical conductivity. Recent progress has produced bulk 3D assemblies of graphene, such as graphene aerogels, by the self-assembly or gelation of the graphene oxide (GO) suspension via hydrothermal reduction, chemical reduction, or direct crosslinking of the GO sheets. Other templating methods like chemical vapor deposition (CVD) coatings and freeze-casting have already been employed to control over the pore morphology of 3D graphene monoliths. However, the architecture of these graphene networks remains largely random, precluding the ability to tailor transport and other physical properties of the material, which limit their performance compared to the potential of an engineered architecture. Here, we report the fabrication of periodic graphene aerogel mesostructures, possessing an engineered architecture via a 3D printing technique known as Direct Ink Writing. The 3D printed graphene aerogels are lightweight, highly conductive and exhibit super-compressibility (up to 90% compressive strain). Moreover, the Young’s moduli of the 3D printed graphene aerogels show an order of magnitude improvement over bulk graphene materials with comparable geometric density and possess large surface areas. Adapting the 3D printing technique to graphene aerogels realizes the possibility of fabricating a myriad of complex aerogel architectures for a broad range of applications.
This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344.
IM release number: LLNL-ABS-670331

Biography:
Cheng Zhu is currently a staff scientist in the Engineering Director of Lawrence Livermore National Laboratory (LLNL). He received his PhD from Oklahoma State University majoring in chemical engineering with a concentration in solid freeform fabrication of colloidal materials. After that, he took the postdoc position at the LLNL and helped to develop lab’s core competence - the additive manufacturing, and focus on the direct ink writing technique. Cheng’s research interests encompass colloidal processing of materials, rheology of complex fluids, direct write manufacturing, and process modeling and optimization. He also has extensive practical experience in fabricate multiscale functional materials using 3d printing technique.

Every Friday 10:45-11:45 a.m., COB 267 (except as noted). Tea and cookies will be served from 10:30 - 10:45 a.m. Questions regarding the seminar series should be directed to Prof. Bin Liu

Location: 
COB 267
Address: 
5200 North Lake Rd.
Merced, CA 95343
United States
Address: 
5200 North Lake Rd.
Merced, CA 95343
United States

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