Issue 21, 2010
From the journal:

Soft Matter

Directed self-assembly of colloidal crystals by dielectrophoretic ordering observed with small angle neutron scattering (SANS)†

Jason M. McMullana  and  Norman J. Wagner*a  

* Corresponding authors

a Department of Chemical Engineering and Center for Molecular and Engineering Thermodynamics, University of Delaware, Newark, Delaware
E-mail: wagnernj@udel.edu

Abstract

We report the first in situ measurements of directed self-assembly (DSA) of colloidal crystal structures by dielectrophoresis (DEP) observed with Small Angle Neutron Scattering (SANS). Development of a new sample environment allows for real time observation of electric field driven crystallization of sub-micron particles. SANS measurements for charge-stabilized colloidal dispersions of two different particle sizes as a function of electric field strength and frequency identify the order-disorder transition. The results validate a proposed master scaling curve for particle ordering developed for micron particles and thereby extends the scaling range to include sub-micron particles. This new experimental method enables the possibility of studying electric field induced alignment and ordering of colloidal nanoparticles.

Graphical abstract: Directed self-assembly of colloidal crystals by dielectrophoretic ordering observed with small angle neutron scattering (SANS)

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Article information

DOI
https://doi.org/10.1039/C0SM00400F
Article type
Paper
Submitted
19 May 2010
Accepted
23 Jul 2010
First published
15 Sep 2010

Soft Matter, 2010,6, 5443-5450

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Directed self-assembly of colloidal crystals by dielectrophoretic ordering observed with small angle neutron scattering (SANS)

J. M. McMullan and N. J. Wagner, Soft Matter, 2010, 6, 5443 DOI: 10.1039/C0SM00400F

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