Size control of monodisperse hollow ORMOSIL particles using a self-emulsion process

Jung, Gyu Il; Kim, Euk Hyun; Lim, Min Hyuk; Koo, Sang Man

doi:10.1016/j.jiec.2016.11.008

Cited by 5 publications

(3 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The effect of sulfur on the morphology of hollow SiC composite particles obtained after magnesiothermic reduction will be discussed later in detail. Monodisperse, spherical ORMOSIL particles with sizes from 70 nm to 4 μm were prepared at the 10‐g scale 37,38 . Subsequently, these ORMOSIL particles were converted to monodisperse spherical SiC composite particles via magnesiothermic reduction as shown in Figure 1.…”

Section: Resultsmentioning

confidence: 99%

“…Monodisperse, spherical ORMOSIL particles with sizes from 70 nm to 4 μm were prepared at the 10-g scale. 37,38 Subsequently, these ORMOSIL particles were converted to monodisperse spherical SiC composite particles via magnesiothermic reduction as shown in Figure 1. No additional mixing of Si sources and carbonaceous precursors was necessary because ORMOSIL particles already contain well-dispersed pre-set amounts of Si and carbon.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Self‐templated magnesiothermic reduction of ORMOSIL particles to monodisperse hollow spherical SiC composite particles

Jung,

Lim,

Lee

et al. 2024

J Am Ceram Soc.

Self Cite

View full text Add to dashboard Cite

Hollow silicon carbide (SiC) particles have attracted attention due to their well‐defined morphology, low density, and large surface area that can be leveraged for a wide variety of applications. Here, we report the self‐templated synthesis of monodisperse hollow spherical SiC composite particles with controllable shell thicknesses using magnesiothermic reduction of organically modified silica (ORMOSIL) particles. Monodisperse ORMOSIL particles containing three organic groups of methyl, vinyl, and mercaptopropyl were produced by a simple one‐pot sol–gel process and then converted to hollow spherical SiC composite particles via a magnesiothermic reduction at 700°C under an inert atmosphere. The spherical morphologies of the original ORMOSIL particles were well maintained through this self‐templated conversion process, but the sizes of the hollow SiC particles were slightly reduced by the thermal treatment. Field emission transmission electron microscopy studies revealed that the shell of hollow particles mainly consists of primary β‐SiC particles with nanometer‐scale sizes. The physical and chemical properties of the hollow SiC composite particles were investigated by scanning electron microscopy, transmission electron microscopy, X‐ray photoelectron spectroscopy, Brunauer–Emmett–Teller, X‐ray diffraction, Fourier transform infrared spectroscopy, Raman, and solid‐state nuclear magnetic resonance analyses. The shell thickness of hollow spherical SiC composite particles can be controlled by simply changing the duration of the thermal conversion process. This study not only provides a simple and easy approach for the preparation of hollow spherical SiC particles but also opens the possibility of large‐scale manufacturing of such particles for commercial applications.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Self‐templated magnesiothermic reduction of ORMOSIL particles to monodisperse hollow spherical SiC composite particles

Jung,

Lim,

Lee

et al. 2024

J Am Ceram Soc.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Second, hydrophobic interactions (Si-R’ ~ ‘R-Si) influence the silane solubility and physical stabilization that is highly dependent on solvent, which in turn influences sol-gel kinetics. For example, in aqueous solution, the fully hydrolyzed (030) product exhibits an amphiphilic character, which, depending on R’ chain length, may promote self-assembly that is not possible for tetraalkoxysilanes [12,13]. Third, the steric and electronic properties of the R’ group on the silicon atom influence nucleophilic substitution.…”

Section: Introductionmentioning

confidence: 99%

Monitoring Silane Sol-Gel Kinetics with In-Situ Optical Turbidity Scanning and Dynamic Light Scattering

Giasuddin

Britt

2019

Molecules

View full text Add to dashboard Cite

Organosilanes (e.g., R’-SiOR3) provide hydrophobic functionality in thin-film coatings, porous gels, and particles. Compared with tetraalkoxysilanes (SiOR4), organosilanes exhibit distinct reaction kinetics and assembly mechanisms arising from steric and electronic properties of the R’ group on the silicon atom. Here, the hydrolysis and condensation pathways of n-propyltrimethoxy silane (nPM) and a tri-fluorinated analog of nPM, 3,3,3-trifluoropropyl trimethoxy silane (3F), were investigated under aqueous conditions at pH 1.7, 2.0, 3.0, and 4.0. Prior to hydrolysis, 3F and nPM are insoluble in water and form a lens at the bottom (3F) or top (nPM) of the solutions. This phase separation was employed to follow reaction kinetics using a Turbiscan instrument to monitor hydrolysis through solubilization of the neat silane lens while simultaneously tracking condensation-induced turbidity throughout the bulk solution. Dynamic light scattering confirmed the silane condensation and particle aggregation processes reported by the turbidity scanning. Employing macroscopic phase separation of the starting reactants from the solvent further allows for control over the reaction kinetics, as the interfacial area can be readily controlled by reaction vessel geometry, namely by controlling the surface area to volume. In-situ turbidity scanning and dynamic light scattering revealed distinct reaction kinetics for nPM and 3F, attributable to the electron withdrawing and donating nature of the fluoro- and organo-side chains of 3F and nPM, respectively.

show abstract

High-affinity truncated aptamers for detection of Cronobacter spp with magnetic separation-assisted DNAzyme-driven 3D DNA walker

Yang,

Ding,

et al. 2024

Microchim Acta

View full text Add to dashboard Cite

Size control of monodisperse hollow ORMOSIL particles using a self-emulsion process

Cited by 5 publications

References 24 publications

Self‐templated magnesiothermic reduction of ORMOSIL particles to monodisperse hollow spherical SiC composite particles

Self‐templated magnesiothermic reduction of ORMOSIL particles to monodisperse hollow spherical SiC composite particles

Monitoring Silane Sol-Gel Kinetics with In-Situ Optical Turbidity Scanning and Dynamic Light Scattering

High-affinity truncated aptamers for detection of Cronobacter spp with magnetic separation-assisted DNAzyme-driven 3D DNA walker

Contact Info

Product

Resources

About