Next Article in Journal
The Influence of the Polymer Amount on the Biological Properties of PCL/ZrO2 Hybrid Materials Synthesized via Sol-Gel Technique
Next Article in Special Issue
Assembly of 1D Granular Structures from Sulfonated Polystyrene Microparticles
Previous Article in Journal
Antibacterial and Tribological Performance of Carbonitride Coatings Doped with W, Ti, Zr, or Cr Deposited on AISI 316L Stainless Steel
Previous Article in Special Issue
Generating Bulk-Scale Ordered Optical Materials Using Shear-Assembly in Viscoelastic Media
Article Menu
Issue 10 (October) cover image

Export Article

Open AccessFeature PaperArticle
Materials 2017, 10(10), 1191; https://doi.org/10.3390/ma10101191

Dispersions of Goethite Nanorods in Aprotic Polar Solvents

1
Laboratoire Charles Coulomb, CNRS, Université de Montpellier, 34095 Montpellier, France
2
Laboratoire de Physique des Solides, CNRS, Université Paris-Sud, Université Paris-Saclay, 91405 Orsay Cedex, France
3
IMT Atlantique, Optics Department, Technopôle Brest-Iroise, CS 83818, 29238 Brest Cedex 3, France
4
Sorbonne Universités, UPMC Univ. Paris 06, CNRS, Collège de France, Laboratoire de Chimie de la Matière Condensée de Paris, 4 place Jussieu, 75005 Paris, France
*
Author to whom correspondence should be addressed.
Received: 18 September 2017 / Revised: 12 October 2017 / Accepted: 14 October 2017 / Published: 17 October 2017
(This article belongs to the Special Issue Designed Colloidal Self-Assembly)
View Full-Text   |   Download PDF [3335 KB, uploaded 26 October 2017]   |  

Abstract

Colloidal suspensions of anisotropic nanoparticles can spontaneously self-organize in liquid-crystalline phases beyond some concentration threshold. These phases often respond to electric and magnetic fields. At lower concentrations, usual isotropic liquids are observed but they can display very strong Kerr and Cotton-Mouton effects (i.e., field-induced particle orientation). For many examples of these colloidal suspensions, the solvent is water, which hinders most electro-optic applications. Here, for goethite (α-FeOOH) nanorod dispersions, we show that water can be replaced by polar aprotic solvents, such as N-methyl-2-pyrrolidone (NMP) and dimethylsulfoxide (DMSO), without loss of colloidal stability. By polarized-light microscopy, small-angle X-ray scattering and electro-optic measurements, we found that the nematic phase, with its field-response properties, is retained. Moreover, a strong Kerr effect was also observed with isotropic goethite suspensions in these polar aprotic solvents. Furthermore, we found no significant difference in the behavior of both the nematic and isotropic phases between the aqueous and non-aqueous dispersions. Our work shows that goethite nanorod suspensions in polar aprotic solvents, suitable for electro-optic applications, can easily be produced and that they keep all their outstanding properties. It also suggests that this solvent replacement method could be extended to the aqueous colloidal suspensions of other kinds of charged anisotropic nanoparticles. View Full-Text
Keywords: liquid crystals; colloids; nanoparticles; electro-optics; X-ray scattering; Kerr effect liquid crystals; colloids; nanoparticles; electro-optics; X-ray scattering; Kerr effect
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Coursault, D.; Dozov, I.; Blanc, C.; Nobili, M.; Dupont, L.; Chanéac, C.; Davidson, P. Dispersions of Goethite Nanorods in Aprotic Polar Solvents. Materials 2017, 10, 1191.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Materials EISSN 1996-1944 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top