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Preparation of Functional Silica Using a Bioinspired Method

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Published on: August 1, 2018

Magnetically-responsive electrophoretic silica organosols.

Gregory N Smith¹, Julian Eastoe¹

¹School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, UK.

Journal of Colloid and Interface Science

|May 28, 2014

Summary

Magnetic silica nanoparticles were created using didodecyldimethylammonium bromide (DDAB) analogs. Only the high-magnetic moment DDAH-stabilized organosols responded to a magnetic field, enabling tailored nanoparticle dispersions.

Keywords:

Electrophoresis Magnetophoresis Nanoparticle dispersions Nonpolar solvents Organosols

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Synthesis and Characterization of Supramolecular Colloids

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Synthesis and Characterization of Supramolecular Colloids

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Published on: April 22, 2016

Area of Science:

Materials Science
Nanotechnology
Colloid Chemistry

Background:

Silica nanoparticles are dispersed in organic solvents (organosols) using surfactants like didodecyldimethylammonium bromide (DDAB).
DDAB analogs with lanthanide tetrahalide counterions, DDAH (high magnetic moment) and DDAN (low magnetic moment), were synthesized to create charged, potentially magnetic, nanoparticles.

Purpose of the Study:

To investigate the charge and magnetic responsiveness of DDAH- and DDAN-stabilized silica organosols.
To determine if nanoparticle dispersions can be tailored to respond to external stimuli.

Main Methods:

Phase-analysis light scattering (PALS) was used to determine the surface charge of the organosols.
Magnetic sedimentation experiments, monitored visually and via UV-vis spectroscopy, assessed magnetic responsiveness.

Main Results:

Both DDAH and DDAN organosols exhibited negative surface charges, similar to DDAB-stabilized nanoparticles.
DDAH-stabilized silica nanoparticles demonstrated magnetic responsiveness, while DDAN-stabilized nanoparticles did not.

Conclusions:

The charge of silica organosols is independent of the magnetic moment of the lanthanide counterion.
Tailored magnetic responsiveness in nanoparticle dispersions can be achieved by selecting appropriate surfactant analogs.