Self‐Catalyzed Synthesis of Organo‐Silica Nanoparticles

Ottenbrite, Raphael M.; Wall, Jason; Siddiqui, Junaid A.

doi:10.1111/j.1151-2916.2000.tb01709.x

Cited by 59 publications

(48 citation statements)

References 17 publications

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“…Positively charged amine groups of the APTMS suggest that MTMS in the oil phase diffuses to the oil-water interface where it reacts with the APTMS in the water phase to form a silica shell around the oil droplet. This effect was also observed by Ottenbrite [27] in their synthesis of organosilica nanoparticles, using aminopropyltriethoxysilane as the silica precursor. Jin found that increasing the volume of APTMS in water above 2% results in gelling, and no microcapsules were formed.…”

Section: Mtms-assisted Silica Coatingsupporting

confidence: 67%

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Nanosynthesis Techniques of Silica-Coated Nanostructures

Shah¹

2018

Novel Nanomaterials - Synthesis and Applications

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Core-shell nanomaterials are fast-emerging hybrid nanocomposites in area of nanotechnology, materials science and biochemistry, which are fast attracting research attention. Nanostructured nanomaterials are utilized in wide industry fields such as electronics, biopharmaceutical, biomedicine, optics and biocatalysis. Owing to the additional exterior shell-coating material, the primary core material's functionality, biocompatibility, chemical stability and colloidal dispersibility can be greatly enhanced. Silica, in particular, is found to be an excellent exterior shell-coating material, has been widely researched for the synthesis of core-shell nanocomposite materials. So far, there have been numerous publications devoted to silica-coating techniques using hydrophobic silanes, such as tetraethylorthosilicate (TEOS) or tetramethyl orthosilicate (TMOS), via the classic Stober method. Recently, there has been strong interest in the use of water-soluble silanes such as MPTMS (3-(mercaptopropyl)-trimethoxysilane), MPTES (3-(mercaptopropyl-triethoxysilane), MTMS (3-(methyltrimethoxysilane)) and sodium silicate for water-based silica-coating techniques have gained much attention, due to the fastgrowing need to focus on process simplicity, large-scale fabrication and environmentalfriendly synthesis techniques of silica-based core-shell nanomaterials. Hence, this chapter focuses on the recent development on silica-coating techniques for colloidal nanoparticles, particularly on water-based techniques and morphologies. In summary, we emphasize the importance of advanced nanomaterials in today's world and envisage there will be more breakthrough research on aqueous silica-coating techniques for silica-encapsulated core-shell nanomaterials.

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Section: Mtms-assisted Silica Coatingsupporting

confidence: 67%

“…Adding MTMS or APTMS alone into water, there is no whitening or sol-gel reactions to be observed. Ottenbrite et al [27] reported similar sol-gel effect. Monodisperse spheres are about 900 nm in diameter.…”

Section: Mtms-assisted Silica Coatingmentioning

confidence: 77%

Nanosynthesis Techniques of Silica-Coated Nanostructures

Shah¹

2018

Novel Nanomaterials - Synthesis and Applications

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“…Exact amino group content at particle surface may provide additional stabilization through steric and charge repulsion to suppress the formation of aggomerates. 13 With increase of APS up to 75 mol %, large spheroidal particles and much agglomeration induced by strong interaction of hydrogen bond due to high amino molar fraction in the copolymer occur (as in Figure 1c). It is interesting that particle size initially decreases and then increases with the APS ratio.…”

Section: Resuits and Discussionmentioning

confidence: 96%

Hydrolytic Co-condensation of Phenyltriethoxysilane with γ-Aminopropyltriethoxysilane in the Presence of Sodium Dodecyl Sulfate

Liu

Zhou

et al. 2006

Polym J

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ABSTRACT:The hydrolytic co-condensation of hydrophobic phenyltriethoxysilane (PTES) and hydrophilicaminopropyltriethoxysilane (APS) under basic catalysis in the presence of sodium dodecyl sulfate (SDS) was investigated. Copolymer particles were influenced significantly by APS/PTES molar ratios, total monomer and SDS concentration. Amino group content of the copolymer was determined by element analysis and back titration. Scanning electron micrographs revealed the morphologies of the copolymer particles. FT-IR, solid state 29 Si NMR and TGA were used to characterize the copolymer. [DOI 10.1295/polymj.38.220] KEY WORDS -Aminopropyltriethoxysilane / Phenyltriethoxysilane / Sodium Dodecyl Sulfate / Hydrolytic Co-condensation / Copolymer Particles / Poly(phenylsilsesquioxane) (PPSQ) from the hydrolytic condensation of phenyltriethoxysilane exhibits outstanding thermal stability, good solubility in common organic solvents and fine electric insulting properties, 1,2 but its compatibility and reactivity with other polymers are not good enough. Poly(aminopropylsilsesquioxane) (PASQ) from the hydrolytic condensation of APS has been developed rapidly as a precursor to organic/inorganic hybrid polymers, 3 as starting material of a two-dimensional polysiloxane complex 4 and as a core for starburst dendrimers due to reactive amino groups, 5 but it is highly hygroscopic. Many properties of polylsilsesquioxanes can be modified by combining two or more RSiO 3=2 components (R is hydrogen or any alkyl, alkylene, aryl, arylene, or their organo-functional derivatives).6,7 The co-condensation method enables better control of the density of functional groups, then control of properties. It is expected that the co-condensation of PTES and APS will yield novel functional silsesquioxanes and the hybrid silsesquioxane will combine the advantages of PPSQ with APSQ. Tunney's patent claimed the preparation of such a poly(aminopropyl/phenylsilsesquioxane) (PAPSQ) by the hydrolytic co-condensation and its use as a precursor of organic/inorganic hybrid materials by imidization or amidation, 8 but no experimental details or characterization data were supplied. Their scheme under acid catalyst employs expensive tetrahydrofuran (THF) as co-solvent and isolation and purification is complicated. PAPSQ has been investigated in a Stöber-like method in our laboratory, 9 but some shortcomings such as low amino group contents and large particle diameter are insuperable from the method. This paper presents a useful alternative for the control of particle size and amino content of the copolymer, and provides easy access to a polysilsesquioxane copolymer with a relatively high degree of functionality. Anionic surfactant SDS was used, which has been shown effective in controlling the size of poly(phenylsilsesquioxane) 10 and poly(phenyl/methylsilsesquioxane) particles.11 Spheroidal copolymer particles with high amino group content are prepared by the hydrolytic co-condensation of hydrophobic PTES and hydrophilic APS in the presence of SDS. Knowledge of the...

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“…The first one takes into account the well-known ability of APTES to take part to the formation of spherical silica particles. 34b, 41,43,44 This process was suggested to occur via an aggregative pathway where primary particles fuse together to form larger objects. 44,45 By this mechanism, the final particles generally show a certain surface roughness, 44 but no specific porosity, 34b a fact that is actually confirmed by our own experiments on the SL-free materials.…”

Section: Sophorolipid/silica Interactionsmentioning

confidence: 99%

One-Step Introduction of Broad-Band Mesoporosity in Silica Particles Using a Stimuli-Responsive Bioderived Glycolipid

Thomas

Babonneau

Coradin

et al. 2013

ACS Sustainable Chem. Eng.

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Stimuli-responsive glycolipid biosurfactants belonging to the family of acidic sophorolipids (SL) have been used to introduce a broad range of pore size in the mesoscale regime (2–30 nm) in silica particles using a one-pot co-assembly sol–gel route in water. The pore size distribution is tailored by the sole interaction between an amino-modified silane, aminopropyltriethoxy silane (APTES), and SL. No additional compounds (e.g., block copolymers, polymers, organic solvents, pore-swelling agents) have been used to promote the formation of mesopores larger than 2 nm. Materials morphology and porosity have been characterized by high resolution TEM, SEM, and nitrogen physisorption, while the interaction between the glycolipid and silica is demonstrated by FT-IR and solid-state NMR.

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Self‐Catalyzed Synthesis of Organo‐Silica Nanoparticles

Cited by 59 publications

References 17 publications

Nanosynthesis Techniques of Silica-Coated Nanostructures

Nanosynthesis Techniques of Silica-Coated Nanostructures

Hydrolytic Co-condensation of Phenyltriethoxysilane with γ-Aminopropyltriethoxysilane in the Presence of Sodium Dodecyl Sulfate

One-Step Introduction of Broad-Band Mesoporosity in Silica Particles Using a Stimuli-Responsive Bioderived Glycolipid

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