We numerically study the process of self-assembly of particle mixtures on fluid-liquid interfaces when an electric field is applied in the direction normal to the interface. The force law for the dependence of the electric field induced dipole-dipole and capillary forces on the distance between the particles and their physical properties obtained in an earlier study by performing direct numerical simulations is used for conducting simulations. The inter-particle forces cause mixtures of nanoparticles to self-assemble into molecular-like hierarchical arrangements consisting of composite particles which are organized in a pattern. However, there is a critical electric intensity value below which particles move under the influence of Brownian forces and do not self-assemble. Above the critical value, when the particles sizes differed by a factor of two or more, the composite particle has a larger particle at its core and several smaller particles forming a ring around it. Approximately same sized particles, when their concentrations are approximately equal, form binary particles or chains (analogous to polymeric molecules) in which positively and negatively polarized particles alternate, but when their concentrations differ the particles whose concentration is larger form rings around the particles with smaller concentration.
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ASME 2017 Fluids Engineering Division Summer Meeting
July 30–August 3, 2017
Waikoloa, Hawaii, USA
Conference Sponsors:
- Fluids Engineering Division
ISBN:
978-0-7918-5805-9
PROCEEDINGS PAPER
Numerical Simulations of Electric Field Driven Self-Assembly of Monolayers of Mixtures of Nanoparticles
E. Amah,
E. Amah
New Jersey Institute of Technology, Newark, NJ
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N. Musunuri,
N. Musunuri
New Jersey Institute of Technology, Newark, NJ
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Ian S. Fischer,
Ian S. Fischer
New Jersey Institute of Technology, Newark, NJ
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Pushpendra Singh
Pushpendra Singh
New Jersey Institute of Technology, Newark, NJ
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E. Amah
New Jersey Institute of Technology, Newark, NJ
N. Musunuri
New Jersey Institute of Technology, Newark, NJ
Ian S. Fischer
New Jersey Institute of Technology, Newark, NJ
Pushpendra Singh
New Jersey Institute of Technology, Newark, NJ
Paper No:
FEDSM2017-69380, V01BT10A010; 6 pages
Published Online:
October 24, 2017
Citation
Amah, E, Musunuri, N, Fischer, IS, & Singh, P. "Numerical Simulations of Electric Field Driven Self-Assembly of Monolayers of Mixtures of Nanoparticles." Proceedings of the ASME 2017 Fluids Engineering Division Summer Meeting. Volume 1B, Symposia: Fluid Measurement and Instrumentation; Fluid Dynamics of Wind Energy; Renewable and Sustainable Energy Conversion; Energy and Process Engineering; Microfluidics and Nanofluidics; Development and Applications in Computational Fluid Dynamics; DNS/LES and Hybrid RANS/LES Methods. Waikoloa, Hawaii, USA. July 30–August 3, 2017. V01BT10A010. ASME. https://doi.org/10.1115/FEDSM2017-69380
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