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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/2396
Title: Effect of size and charge asymmetry on aggregation kinetics of oppositely charged nanoparticles
Authors: Singh K.
Raghav A.
Jha P.K.
Satapathi S.
Published in: Scientific Reports
Abstract: We report a theoretical and experimental study of the aggregation kinetics of oppositely charged nanoparticles. Kinetic Monte Carlo simulations are performed for symmetric, charge-asymmetric and size-asymmetric systems of oppositely charged nanoparticles. Simulation results show that both the weight and number average aggregate size kinetics exhibit power law scaling with different exponents for small and intermediate time of evolution. The qualitative behavior of the symmetric and the size asymmetric system are the same, but the charge asymmetric system shows anomalous behavior for intermediate to high particle concentrations. We also observe a strong dependence of power law exponents on the particle concentration. Radius of gyration of the cluster that indicates how nanoparticles inside a cluster are distributed around the center of mass of the cluster shows a non-monotonic time evolution with pronounced peak at higher particle concentration. The dependence of particle concentration on aggregation kinetics as observed by predictive numerical simulation is further verified experimentally by monitoring the time evolution of aggregate size of nanoparticles assemblies of Poly (methacrylic acid) (PMMA) nanoparticles functionalized with oppositely charged ligands. These size and charge tunable asymmetric polymeric nanoparticles were synthesized by modified miniemulsion technique. The integrated approach for studying nanoparticles aggregation as described here renders new insights into super structure formation and morphology optimization which can be potentially useful in the design of new materials, such as organic photovoltaics. © 2019, The Author(s).
Citation: Scientific Reports (2019), 9(1): -
URI: https://doi.org/10.1038/s41598-019-40379-y
http://repository.iitr.ac.in/handle/123456789/2396
Issue Date: 2019
Publisher: Nature Publishing Group
ISSN: 20452322
Author Scopus IDs: 35196906200
57192877216
36672956500
36610769900
Author Affiliations: Singh, K., Department of Physics, IIT Roorkee, Roorkee, Uttarakhand 246777, India, Centre of Nanotechnology, IIT Roorkee, Roorkee, Uttarakhand 247667, India
Raghav, A., Department of Physics, IIT Roorkee, Roorkee, Uttarakhand 246777, India
Jha, P.K., Department of Chemical Engineering, IIT Roorkee, Roorkee, Uttarakhand 247667, India
Satapathi, S., Department of Physics, IIT Roorkee, Roorkee, Uttarakhand 246777, India, Centre of Nanotechnology, IIT Roorkee, Roorkee, Uttarakhand 247667, India
Funding Details: K.S. acknowledge the financial support from Science and Engineering Board (SERB), India (File No. PDF/2016/000442). PKJ thanks the INSPIRE award from the Department of Science and Technology (DST), India (No. IFA14/ENG-72). SS like to acknowledge DST Solar Energy Initiative Grant (DST-SERI-S147).
Corresponding Author: Satapathi, S.; Department of Physics, IIT RoorkeeIndia; email: ssphf.fph@iitr.ac.in
Appears in Collections:Journal Publications [CH]

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