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You are here: Home Events Prof. Jaydeep Basu "Assembly and Dynamics of Polymeric Nanoparticles: Role of Confinement"

Prof. Jaydeep Basu "Assembly and Dynamics of Polymeric Nanoparticles: Role of Confinement"

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Department of Physics, Indian Institute of Science, Bangalore, India

What
  • Seminar
When Feb 04, 2015
from 02:15 PM to 03:00 PM
Where cancelled
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cancelled

Dispersion of nanoparticles in polymers to create new polymeric materials is a key challenge in polymer science. In this regard polymeric nanoparticles, with minimal enthalpic interactions, especially with a homologous matrix polymer was deemed to be the most effective strategy to enhance dispersion. However, it turns out that entropy plays a major role in such blends and nanocomposites leading to auto-phobic interfacial wetting/de-wetting and hence failure of such strategies in several cases. Here we will discuss the issues involved in circumventing this problem with polymer grafted gold nanoparticles embedded in polystyrene especially how confinement can aid in the dispersion. We will also discuss how the dynamics of these embedded polymeric nanoparticles show apparent anisotropic diffusivity and significantly reduced drag as well as enhanced hydrodynamic interactions while moving through the viscous polymer medium and its connection to the glass transition temperature of the polymer. Finally, we will discuss how these nanoparticles can self-assemble at an interface to form hierarchical patterns due to a competition between de-wetting and decomposition within a thin film of these nanoparticles in its good solvent.




References:
[1] S. Chandran, N. Begam, V. Padmanabhan, and J. K. Basu, Nature Communications 5, 3697 (2014)
[2] S. Chandran, M.K. Mukhopadhyay, and J.K.  Basu, J. Chem. Phys. 138, 014902 (2013)

 


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