Event calendar file
Department of Nuclear and Atomic Physics Seminars
Graphene based Coatings and Composites
by Dr. Nikhil Koratkar (Department of Mechanical, Aerospace and Nuclear Engineering, and Department of Materials Science and Engineering, Rensselaer Polytechnic Institute, New York, USA)
Tuesday, July 10, 2012
from
to
(Asia/Kolkata)
at Colaba Campus ( AG80 )
at Colaba Campus ( AG80 )
| Description |
Graphene is a single-atom-thick sheet of sp2 hybridized carbon atoms that exhibits a unique blend of mechanical, thermal, electronic and optical properties. In this talk, I will describe both top-down (exfoliation of graphite) as well as bottom-up (chemical vapour deposition) methods for graphene synthesis. Top-down methods such as exfoliation of graphite enables synthesis of bulk quantities of graphene platelets that are well suited for polymer composites applications. I will describe various mechanical, electrical and thermal properties of graphene composites and discuss the reasons for the superiority of graphene over other forms of nanofiller reinforcement. Graphene synthesized by bottom-up methods such as chemical vapour deposition are well suited for nanoelectronic and optoelectronic device applications. Another emerging area for such chemical vapour deposition grown graphene films is as conformal, conducting and impermeable surface coatings. In this talk, I will describe the synthesis of such graphene coatings and their fundamental wetting properties. A drop of water sitting on a graphene-coated surface sees through the graphene layer and conforms to the wetting forces (e.g. van der Waals interactions) dictated by the surface beneath. We can this effect the wetting transparency of graphene! Molecular dynamics simulations and continuum predictions indicate that graphene’s wetting transparency is related to its extreme thinness. It should be noted that such wetting transparency is lost on surfaces where the wettability is dominated by ‘chemistry’ since short range chemical bonds cannot form through the graphene coating. The ability of graphene coatings to independently tune the properties of surfaces without disrupting their wetting response could have important implications in surface engineering. Related Publications
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| Organised by | Dr. Vaibhav Prabhudesai |
