Size, volume fraction, and nucleation of Stober silica nanoparticles

Green, D.L; Lin, Jianzhen; Lam, Yui-Fai; Hu, Michael Z.; Schaefer, Dale W.; Harris, Michael T.

doi:10.1016/s0021-9797(03)00610-6

Cited by 322 publications

(232 citation statements)

References 28 publications

Supporting

Mentioning

224

Contrasting

Unclassified

Order By: Relevance

“…SAXS is capable to characterize the size distribution and aggregation state of nanoparticles, hence it is widely applied to describe silica nanoparticles [31]. The SAXS curves of native and aminopropyl modified silica sols (purified by dialysis) reveal that both systems are monodisperse with average diameter around 20 nm based on the fits applying the solid sphere model with log-normal size distribution ( Table 1).…”

Section: Fig1 Saxs and Tem Analysis Of Native And Aminopropyl Silicmentioning

confidence: 99%

Preparation, purification, and characterization of aminopropyl-functionalized silica sol

Pálmai

Nagy

Mihály

et al. 2013

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

A new, simple and "green" method was developed for the surface modification of 20 nm diameter Stöber silica particles with 3-aminopropyl(diethoxy)methylsilane in ethanol. The bulk polycondensation of the reagent was inhibited and the stability of the sol preserved by adding a small amount of glacial acetic acid after appropriate reaction time. Centrifugation, ultrafiltration and dialysis were compared in order to choose a convenient purification technique that allows the separation of unreacted silylating agent from the nanoparticles without destabilizing the sol. The exchange of the solvent to acidic water during the purification yielded a stable colloid, as well. Structural and morphological analysis of the obtained aminopropyl silica was performed using transmission electron microscopy (TEM), dynamic light scattering (DLS) and zeta potential measurements, Fourier-transform infrared (FTIR), 13 C and 29 Si MAS nuclear magnetic resonance (NMR) spectroscopies, as well as small angle X-ray scattering (SAXS). Our investigations revealed that the silica nanoparticle surfaces were partially covered with aminopropyl groups, and multilayer adsorption followed by polycondensation of the silylating reagent was successfully avoided. The resulting stable aminopropyl silica sol (ethanolic or aqueous) is suitable for biomedical uses due to its purity.

show abstract

Section: Fig1 Saxs and Tem Analysis Of Native And Aminopropyl Silicmentioning

confidence: 99%

Preparation, purification, and characterization of aminopropyl-functionalized silica sol

Pálmai

Nagy

Mihály

et al. 2013

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

show abstract

“…The second model, controlled aggregation, is based on continuous nucleation throughout the reaction. These primary particles or nuclei cluster together or merge with larger aggregates to eventually produce a narrow size distribution 12 …”

Section: Introductionmentioning

confidence: 99%

Influence of the hydrolysis and condensation time on the preparation of hybrid materials

et al. 2011

View full text Add to dashboard Cite

This work describes the hydrolytic sol-gel synthesis of silica particles prepared by a modified Stöber route, using the organofunctionalized alkoxide 3-methacryloxypropyl trimethoxysilane and tetraethylorthosilicate. The silica particles were obtained through basic catalysis from a mixture of precursor alkoxides, water, and isopropyl alcohol. Samples were prepared with change to the pre-hydrolysis and condensation time of tetraethylortosilicate, followed by addition of the organosilane 3-methacryloxypropyl trimethoxysilane. Eu 3+ ions were added to the alkoxides mixture, in order to obtain structural information about the silica particles. The samples were centrifuged, washed with ethanol, and dried at 50 °C. The xerogel was analyzed by thermogravimetric analysis, photoluminescence, transmission electron microscopy, and infrared spectroscopy. The photoluminescence spectra revealed Eu 3+ lines characteristic of the ion 5 D 0 → 7 F J (J = 0, 1, 2, 3, 4) transition. The thermogravimetric curve and infrared spectra confirmed the presence of the alkoxide organic group and water in the materials. Transmission electron microscopy showed spherical particles with varied size. The time of pre-hydrolysis and condensation as well as the addition of 3-methacryloxypropyl trimethoxysilane affect the final shape and size of the materials, so they can be used as control factors.

show abstract

“…26,27 Lanthanide doped nanoparticles were coated over silica using a method adapted by Yu et al 28 Synthesis of …”

Section: Characteristics Of Nanoparticle-loaded Capsulesmentioning

confidence: 99%

Immuno-silent polymer capsules encapsulating nanoparticles for bioimaging applications

et al. 2017

View full text Add to dashboard Cite

show abstract

Size, volume fraction, and nucleation of Stober silica nanoparticles

Cited by 322 publications

References 28 publications

Preparation, purification, and characterization of aminopropyl-functionalized silica sol

Preparation, purification, and characterization of aminopropyl-functionalized silica sol

Influence of the hydrolysis and condensation time on the preparation of hybrid materials

Immuno-silent polymer capsules encapsulating nanoparticles for bioimaging applications

Contact Info

Product

Resources

About