NDLI: Ultra-capacitor flexible films with tailored dielectric constants using electric field assisted assembly of nanoparticles

Content Provider	Royal Society of Chemistry (RSC)
Author	Batra, Saurabh Cakmak, Miko
Copyright Year	2015
Abstract	In this study, the chaining and preferential alignment of barium titanate nanoparticles (100 nm) through the thickness direction of a polymer matrix in the presence of an electric field is shown. Application of an AC electric field in a well-dispersed solution leads to the formation of chains of nanoparticles in discrete rows oriented with their primary axis in the E-field direction due to dielectrophoresis. The change in the orientation of these chains was quantified through statistical analysis of SEM images and was found to be dependent on E-field, frequency and viscosity. When a DC field is applied a distinct layer consisting of dense particles was observed with micro-computed tomography. These studies show that the increase in DC voltage leads to increase in the thickness of the particle rich layer along with the packing density also increasing. Increasing the mutual interactions between particles due to the formation of particle chains in the “Z”-direction decreases the critical percolation concentration above which substantial enhancement of properties occurs. This manufacturing method therefore shows promise to lower the cost of the products for a range of applications including capacitors by either enhancing the dielectric properties for a given concentration or reduces the concentration of nanoparticles needed for a given property.
Starting Page	20571
Ending Page	20583
Page Count	13
File Format	HTM / HTML PDF
ISSN	20403364
Volume Number	7
Issue Number	48
Journal	Nanoscale
DOI	10.1039/c5nr06253e
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Viscosity Electric field Barium titanate Percolation theory Polymer Dielectric Preferential alignment Composite material DC
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology

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