Magnetically-responsive electrophoretic silica organosols

Julian  Eastoe; Gregory Smith

doi:10.1016/j.jcis.2014.04.001

Magnetically-responsive electrophoretic silica organosols

Julian Eastoe, Gregory Smith

Research output: Contribution to journal › Article (Academic Journal) › peer-review

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451 Downloads (Pure)

Abstract

Hypothesis

Silica nanoparticles can be dispersed in organic solvents (organosols) using surfactants, such as didodecyldimethylammonium bromide (DDAB). DDAB analogs prepared with lathanide tetrahalide counterions, either a high-magnetic moment ion (HoCl₃Br, DDAH) or low-magnetic moment one (NdCl₃Br, DDAN), are expected to produce charged particles, but only DDAH-stabilized dispersions are expected to be magnetically responsive.

Experiments

Phase-analysis light scattering (PALS) measurements have been performed to determine the charge on DDAH- and DDAN-stabilized organosols. Magnetic sedimentation experiments have been performed to determine whether or not the silica dispersions are magnetically responsive. Sedimentation was monitored both by visual observations and UV–vis spectroscopy.

Findings

Both DDAH and DDAN organosols are negatively charged, the same as DDAB-stabilized nanoparticles. The DDAH-stabilized nanoparticles are found to respond to a magnetic field, whereas the DDAN-stabilized nanoparticles do not. This opens up possibilities for creating nanoparticle dispersions in nonpolar solvents which can be tailored to respond to desired external stimuli.

Original language	English
Pages (from-to)	252-255
Number of pages	4
Journal	Journal of Colloid and Interface Science
Volume	426
Early online date	13 Apr 2014
DOIs	https://doi.org/10.1016/j.jcis.2014.04.001
Publication status	Published - 15 Jul 2014

Bibliographical note

Short Communication

Keywords

Electrophoresis
Magnetophoresis
Nanoparticle dispersions
Organosols
Nonpolar solvents

Access to Document

10.1016/j.jcis.2014.04.001

JCIS-14-233-Final
NOTICE: this is the author’s version of a work that was accepted for publication in Journal of Colloid and Interface Science. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Colloid and Interface Science, [VOL 426, (15 July 2014)] DOI: 10.1016/j.jcis.2014.04.001
Accepted author manuscript, 1.58 MB

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NEUTRON SCATTERING STUDIES OF CO2-BASED GELS
Eastoe, J. (Principal Investigator)
1/10/08 → 1/10/12
Project: Research

Cite this

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title = "Magnetically-responsive electrophoretic silica organosols",

abstract = "HypothesisSilica nanoparticles can be dispersed in organic solvents (organosols) using surfactants, such as didodecyldimethylammonium bromide (DDAB). DDAB analogs prepared with lathanide tetrahalide counterions, either a high-magnetic moment ion (HoCl3Br, DDAH) or low-magnetic moment one (NdCl3Br, DDAN), are expected to produce charged particles, but only DDAH-stabilized dispersions are expected to be magnetically responsive.ExperimentsPhase-analysis light scattering (PALS) measurements have been performed to determine the charge on DDAH- and DDAN-stabilized organosols. Magnetic sedimentation experiments have been performed to determine whether or not the silica dispersions are magnetically responsive. Sedimentation was monitored both by visual observations and UV–vis spectroscopy.FindingsBoth DDAH and DDAN organosols are negatively charged, the same as DDAB-stabilized nanoparticles. The DDAH-stabilized nanoparticles are found to respond to a magnetic field, whereas the DDAN-stabilized nanoparticles do not. This opens up possibilities for creating nanoparticle dispersions in nonpolar solvents which can be tailored to respond to desired external stimuli.",

keywords = "Electrophoresis, Magnetophoresis, Nanoparticle dispersions, Organosols, Nonpolar solvents",

author = "Julian Eastoe and Gregory Smith",

note = "Short Communication",

year = "2014",

month = jul,

day = "15",

doi = "10.1016/j.jcis.2014.04.001",

language = "English",

volume = "426",

pages = "252--255",

journal = "Journal of Colloid and Interface Science",

issn = "0021-9797",

publisher = "Elsevier",

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TY - JOUR

T1 - Magnetically-responsive electrophoretic silica organosols

AU - Eastoe, Julian

AU - Smith, Gregory

N1 - Short Communication

PY - 2014/7/15

Y1 - 2014/7/15

N2 - HypothesisSilica nanoparticles can be dispersed in organic solvents (organosols) using surfactants, such as didodecyldimethylammonium bromide (DDAB). DDAB analogs prepared with lathanide tetrahalide counterions, either a high-magnetic moment ion (HoCl3Br, DDAH) or low-magnetic moment one (NdCl3Br, DDAN), are expected to produce charged particles, but only DDAH-stabilized dispersions are expected to be magnetically responsive.ExperimentsPhase-analysis light scattering (PALS) measurements have been performed to determine the charge on DDAH- and DDAN-stabilized organosols. Magnetic sedimentation experiments have been performed to determine whether or not the silica dispersions are magnetically responsive. Sedimentation was monitored both by visual observations and UV–vis spectroscopy.FindingsBoth DDAH and DDAN organosols are negatively charged, the same as DDAB-stabilized nanoparticles. The DDAH-stabilized nanoparticles are found to respond to a magnetic field, whereas the DDAN-stabilized nanoparticles do not. This opens up possibilities for creating nanoparticle dispersions in nonpolar solvents which can be tailored to respond to desired external stimuli.

AB - HypothesisSilica nanoparticles can be dispersed in organic solvents (organosols) using surfactants, such as didodecyldimethylammonium bromide (DDAB). DDAB analogs prepared with lathanide tetrahalide counterions, either a high-magnetic moment ion (HoCl3Br, DDAH) or low-magnetic moment one (NdCl3Br, DDAN), are expected to produce charged particles, but only DDAH-stabilized dispersions are expected to be magnetically responsive.ExperimentsPhase-analysis light scattering (PALS) measurements have been performed to determine the charge on DDAH- and DDAN-stabilized organosols. Magnetic sedimentation experiments have been performed to determine whether or not the silica dispersions are magnetically responsive. Sedimentation was monitored both by visual observations and UV–vis spectroscopy.FindingsBoth DDAH and DDAN organosols are negatively charged, the same as DDAB-stabilized nanoparticles. The DDAH-stabilized nanoparticles are found to respond to a magnetic field, whereas the DDAN-stabilized nanoparticles do not. This opens up possibilities for creating nanoparticle dispersions in nonpolar solvents which can be tailored to respond to desired external stimuli.

KW - Electrophoresis

KW - Magnetophoresis

KW - Nanoparticle dispersions

KW - Organosols

KW - Nonpolar solvents

U2 - 10.1016/j.jcis.2014.04.001

DO - 10.1016/j.jcis.2014.04.001

M3 - Article (Academic Journal)

C2 - 24863790

SN - 0021-9797

VL - 426

SP - 252

EP - 255

JO - Journal of Colloid and Interface Science

JF - Journal of Colloid and Interface Science

ER -

Magnetically-responsive electrophoretic silica organosols

Abstract

Bibliographical note

Keywords

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NEUTRON SCATTERING STUDIES OF CO2-BASED GELS

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