Analysis of ferrofluids by capillary electrophoresis

Morneau, André; Pillai, V.; Nigam, Sonu; Winnik, Françoise M.; Ziolo, Ronald F.

doi:10.1016/s0927-7757(98)00215-5

Cited by 21 publications

(17 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Over the last two decades, there has been an effort to extend CE applications to NP characterization 16, 17 since this technique can provide both information on particle size distribution and surface charge density. Moreover, the high selectivity of this separation method allows the characterization of different particle populations (organic 18–25 and inorganic 26–30) in a mixture, as well as the detection of impurities present in the dispersant medium 31. Until now, most studies focused on the characterization of particles bearing negative electrical charge, mainly on the basis of their size.…”

Section: Introductionmentioning

confidence: 99%

Charge‐based characterization of nanometric cationic bifunctional maghemite/silica core/shell particles by capillary zone electrophoresis

d’Orlyé

Varenne

Georgelin³

et al. 2009

Electrophoresis

View full text Add to dashboard Cite

In view of employing functionalized nanoparticles (NPs) in the context of an immunodiagnostic, aminated maghemite/silica core/shell particles were synthesized so as to be further coated with an antibody or an antigen via the amino groups at their surface. Different functionalization rates were obtained by coating these maghemite/silica core/shell particles with 3-(aminopropyl)triethoxysilane and 2-[methoxy(polyethyleneoxy)propyl]-trimethoxysilane at different molar ratios. Adequate analytical performances with CE coupled with UV-visible detection were obtained through semi-permanent capillary coating with didodecyldimethyl-ammonium bromide, thus preventing particle adsorption. First, the influence of experimental conditions such as electric field strength, injected particle amount as well as electrolyte ionic strength and pH, was evaluated. A charge-dependent electrophoretic mobility was evidenced and the separation selectivity was tuned according to electrolyte ionic strength and pH. The best resolutions were obtained at pH 8.0, high ionic strength (ca. 100 mM), and low total particle volume fraction (ca. 0.055%), thus eliminating interference effects between different particle populations in mixtures. A protocol derived from Kaiser's original description was performed for quantitation of the primary amino groups attached onto the NP surface. Thereafter a correlation between particle electrophoretic mobility and the density of amino groups at their surface was established. Eventually, CE proved to be an easy, fast, and reliable method for the determination of NP effective surface charge density.

show abstract

Section: Introductionmentioning

confidence: 99%

Charge‐based characterization of nanometric cationic bifunctional maghemite/silica core/shell particles by capillary zone electrophoresis

d’Orlyé

Varenne

Georgelin³

et al. 2009

Electrophoresis

View full text Add to dashboard Cite

show abstract

“…While Morneau et al [53] investigated mainly negatively charged ferrofluids by CE, d'Orlyé et al [54] demonstrated the possibility of a size-selective separation of very small positively charged maghemite (g-Fe 2 O 3 ) nanoparticles with number mean solid diameters ranging from 6 to 10 nm. The separation of cationic nanoparticles by CE requires the coating of the inner capillary wall in order to prevent wall adsorption of the particles.…”

Section: Coagulationmentioning

confidence: 99%

Characterization of nanoparticles by capillary electromigration separation techniques

Pyell¹

2010

Electrophoresis

133

View full text Add to dashboard Cite

Considering the large number of papers presented in the last years in the field of CE and plate gel electrophoresis (PGE) of nanoparticles and nanoparticle-biomolecule conjugates, this review article gives an overview on the application of capillary electromigration separation techniques for the separation of nanoparticles and nanoparticle-biomolecule conjugates according to differences in size and/or zeta potential and for the determination of several physicochemical parameters characterizing a population of nanoparticles. A brief introduction is given into the theoretical background of the size-selective electrophoretic separation of nanospheres in free-solution and sieving media including involvement of interparticle interactions. Some aspects of colloidal system stability are discussed. Applications of capillary electromigration techniques in the field of size-selective and/or surface charge density-selective separation of nanoparticles and nanoparticle-biomolecule conjugates are described, including free-solution CE, CGE, IEF, and ITP, complemented by an overview on the application of (semipreparative) PGE in the field of nanotechnology and nanobiotechnology. The review also includes actual developments regarding the coupling of capillary electromigration techniques to (wavelength-resolved) LIF and other selective detection methods and studies concerning individual-particle CE.

show abstract

“…Ferrofluids have also been characterized using CE [43]. Ferrofluids are simply magnetic particles stabilized in non-magnetic carrier fluids.…”

Section: Inorganic Particlesmentioning

confidence: 99%

Separation and analysis of colloidal/nano-particles including microorganisms by capillary electrophoresis: a fundamental review

Rodríguez

Armstrong

2004

Journal of Chromatography B

166

127

View full text Add to dashboard Cite

Analysis of ferrofluids by capillary electrophoresis

Cited by 21 publications

References 17 publications

Charge‐based characterization of nanometric cationic bifunctional maghemite/silica core/shell particles by capillary zone electrophoresis

Charge‐based characterization of nanometric cationic bifunctional maghemite/silica core/shell particles by capillary zone electrophoresis

Characterization of nanoparticles by capillary electromigration separation techniques

Separation and analysis of colloidal/nano-particles including microorganisms by capillary electrophoresis: a fundamental review

Contact Info

Product

Resources

About