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SUMMARY:SHAPE PROGRAMMABLE 3D MESOSTRUCTURES AND FUNCTIONAL DEVICES - Prof
 . Yonggang Huang\, McCORMICK school of Engineering\, Northwestern Universi
 ty. 
DTSTART:20240321T140000Z
DTEND:20240321T150000Z
UID:TALK212800@talks.cam.ac.uk
CONTACT:46601
DESCRIPTION:A rapidly expanding research area involves the development of 
 routes to shape programmable three-dimensional (3D) structures with featur
 e sizes in the mesoscopic range (that is\, between tens of nanometres and 
 hundreds of micrometres).  A goal is to establish methods to control the p
 roperties of materials systems and the function of devices\, through not o
 nly static architectures\, but also morphable structures and shape-shiftin
 g processes.  Soft matter equipped with responsive components can switch b
 etween designed shapes\, but cannot support the types of dynamic morphing 
 capabilities needed to reproduce continuous shape-shifting processes of in
 terest for many applications.  Challenges lie in the establishment of 3D a
 ssembly/fabrication techniques compatible with wide classes of materials a
 nd 3D geometries\, and schemes to program target shapes after fabrication.
   In this talk\, I will introduce a mechanics-guided assembly approach tha
 t exploits controlled buckling for constructing complex 3D micro/nanostruc
 tures from patterned two-dimensional (2D) micro/nanoscale precursors that 
 can be easily formed using established semiconductor technologies.  This a
 pproach applies to a very broad set of materials (e.g.\, semiconductors\, 
 polymers\, metals\, and ceramics) and even their heterogeneous integration
 \, over a wide range of length scales (e.g.\, from 100 nm to 10 cm).  To a
 llow realization of 3D mesostructures that are capable of qualitative shap
 e reconfiguration\, we devise a loading-path controlled strategy that reli
 es on elastomer platforms deformed in different time sequences to elastica
 lly alter the 3D geometries of supported mesostructures via nonlinear buck
 ling.  I will also introduce a recent work on shape programmable soft surf
 ace\, constructed from a matrix of filamentary metal traces\, driven by pr
 ogrammable\, distributed electromagnetic forces that follow from the passa
 ge of electrical currents in the presence of a static magnetic field.  Und
 er the guidance of a mechanics model-based strategy to solve the inverse p
 roblem\, the surface can morph into a wide range of 3D target shapes and s
 hape-shifting processes.  The compatibility of our approaches with the sta
 te-of-the-art fabrication/processing techniques\, along with the versatile
  capabilities\, allow transformation of diverse existing 2D microsystems i
 nto complex configurations\, providing unusual design options in the devel
 opment of novel functional devices.\n\nShort Bio\n\nYonggang Huang is the 
 Achenbach Professor of Mechanical Engineering\, Civil and Environmental En
 gineering\, and Materials Science and Engineering at Northwestern Universi
 ty. He is interested in mechanics of stretchable and flexible electronics\
 , and mechanically guided deterministic 3D assembly. He has published 2 bo
 oks and more than 700 journal papers and book chapters\, including 15 in S
 cience and 7 in Nature. He is a member of the US National Academy of Engin
 eering\, US National Academy of Sciences\, a fellow of American Academy of
  Arts and Sciences\, and a foreign member of the Royal Society (London). H
 e has received numerous medals for his research contributions including mo
 st recently the IUTAM 2024 Rodney Hill Prize. He has also received awards 
 for undergraduate teaching and advising at all universities he has taught.
  For his contribution to engineering science and his leadership in the soc
 iety\, the Society of Engineering Sciences renamed its Engineering Science
  Medal to Yonggang Huang Engineering Science Medal in 2024.\n\n \n\n
LOCATION:Department of Engineering - LR5
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