Effect of functional anisotropy on the local dynamics of polymer grafted nanoparticles

Iyer, Balaji V S (2022) Effect of functional anisotropy on the local dynamics of polymer grafted nanoparticles. Soft Matter. pp. 1-13. ISSN 1744-683X

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End-functionalised polymer grafted nanoparticles (PGNs) form bonds when their coronas overlap. The bonded interactions between the overlapping PGNs depend on the energy of the bonds (L1). In the present study, oscillatory deformation imposed on a simple system with interacting PGNs placed on the vertices of a triangle is employed to examine the local dynamics as a function of energy of the bonds and the frequency of oscillation relative to the characteristic rupture frequency, omega(0) = 2(pi)nu exp(-U/k(B)T), of the bonds. In particular, the effect of functional anisotropy is studied by introducing bonds of two different energies between adjacent PGNs. A multicomponent model developed by Kadre and lyer, Macromol. Theory Simul., 2021, 30, 2100005, that combines the features of effective interactions between PGNs, self-consistent field theory and master equation approach to study bond kinetics is employed to obtain the local dynamics. The resulting force-strain curves are found to exhibit a simple broken symmetry where F-x (gamma,(gamma)over dot) not equal -F-x (-gamma,(gamma)over dot) and F-gamma (gamma,(gamma)over dot) not equal F-gamma (-gamma, -(gamma)over dot) in systems with functional anisotropy. Fourier analysis of the dynamic response reveals that functional anisotropy leads to finite even harmonic terms and systematic variation of both the elastic and dissipative response from that of the isotropic systems. Furthermore, the intra-cycle variations in the strain stiffening and shear thickening ratios obtained from the analysis indicate that functional anisotropy leads to anisotropic nonlinear response.

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IITH Creators:
IITH CreatorsORCiD
Item Type: Article
Additional Information: The author would like to thank Dr Subhradeep Chatterjee from the MSME department of IIT Hyderabad for helpful discussions and suggestions. The author would also like to acknowledge funds from Department of Chemical Engineering, IIT Hyderabad for the support of computation infrastructure in the research group.
Subjects: Chemical Engineering
Divisions: Department of Chemical Engineering
Depositing User: . LibTrainee 2021
Date Deposited: 01 Aug 2022 09:22
Last Modified: 01 Aug 2022 09:22
URI: http://raiith.iith.ac.in/id/eprint/10038
Publisher URL: http://doi.org/10.1039/d2sm00710j
OA policy: https://v2.sherpa.ac.uk/id/publication/18033
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