Preparation of metal oxide or metal nanoparticles in silica via metal coordination to organofunctional trialkoxysilanes

Schubert, Ulrich

doi:10.1002/pi.2526

Cited by 17 publications

(9 citation statements)

References 17 publications

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“…These complexes are solubilized in the micelles, which leads to the formation of the metalomicelles. [37] In many respects the discussed process resembles at this stage the solgel processes combined with tethering of metal ions, studied by Shubert et al [22,27,28] The difference is that here the Au 3 + ions are complexed not by silica precursor, but by the surfactant micelles.…”

Section: Aunps Growth Mechanismmentioning

confidence: 97%

“…[17,[21][22][23][24][25] In the last case, the as prepared silica is typically impregnated with metal precursor, [21,26] followed by its reduction in high temperature (e. g., at 400°C, employing H 2 as reducing agent). An interesting alternative to such an approach is a sol-gel method combined with tethering of metal ions [22,27,28] in which metal precursors (Au, Ag, or Pt ions) are initially complexed by silica precursor. As a result, the metal ions are homogeneously distributed within the resulting silica matrix.…”

Section: Introductionmentioning

confidence: 99%

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A Seedless Method for Gold Nanoparticle Growth inside a Silica Matrix: Fabrication of Materials Capable of Third‐Harmonic Generation in the Near‐Infrared

et al. 2019

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A composite in which gold nanoparticles (AuNPs) approximately 10 nm in size are embedded in amorphous transparent silica matrix has been produced. The synthetic protocol uses HAuCl4 as the Au ion source, tetraethoxysilane (TEOS) as the SiO2 precursor, and l‐ascorbic acid (AA) as the reducing agent. AA is employed before the sol‐gel process in an amount sufficient only for reduction of Au3+ ions to Au+. By using a cationic surfactant, benzylcetyldimethylammonium chloride hydrate (BDAC) and/or cetyltrimethylammonium bromide (CTAB), the Au+ ions are encapsulated within metalomicelles, which prevents them from being reduced to Au0 and enables their homogeneous distribution in the gel. Reduction of Au+ to Au0 and the growth of the AuNPs occurs at room temperature during the gelation, and arises from the release of EtOH during the hydrolysis of TEOS. The composites contain 0.027 wt % of Au. They exhibit nonlinear optical behavior characterized by the third‐order nonlinear refraction index, n2, in the range 3.6–5.7×10−16 cm2 W−1 at λ=1.030 μm. The composites are capable of effective third‐harmonic generation of ultrashort near‐IR (210 fs, 1.030 μm) laser pulse through a direct third‐order mechanism.

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Section: Aunps Growth Mechanismmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

A Seedless Method for Gold Nanoparticle Growth inside a Silica Matrix: Fabrication of Materials Capable of Third‐Harmonic Generation in the Near‐Infrared

et al. 2019

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“…In the system of (tetra-npropyl) or (tetra-isopropyl) orthotitanates and methacrylic acid, depending on molar ratios of the components, temperature of reaction, and time of holding of the reaction products, crystal or amorphous Ti 9 O 8 (O-н-Pr) 4 (ММA) 16 oxo titanium 6 (MAA) 6 [63]. Synthesis of metal and metal oxide nanoparticles in silica matrices with usage of metal coordinated organo-functional trialkoxy silanes is considered in detail in recent review [64].…”

Section: Combination Of Reactions Of Polymerization and Sol-gel Synthmentioning

confidence: 99%

Physics and Chemistry of Sol-Gel Nanocomposites Formation

Pomogailo

Джардималиева

2014

Nanostructured Materials Preparation via Condensation Ways

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This method called sol-gel or dip-and spin-on-glass process, spin-spray-coating, sol -gel glasses, which was widely used in the second half of the twentieth century [1] 1 is one of the most universal condensation ways of production of nanoparticles stabilized by inorganic oxide or polymeric matrices. A special interest is attracted to materials obtained by combination of sol-gel chemistry and aerosol or spray processes, and combination of sol-gel synthesis with intercalation. This also includes combinations of sol-gel processes with different types of thermolysis, and approaches met in nature in biomineralization processes, etc., which are new aspects of integrative chemistry approach. Traditional sol-gel concept is based on hydrolysis and condensation of metal alkoxides and many metalloids including different ways of their modification [2,3]. Main reactions proceed at relatively low temperatures with usage of prepared in advance or synthesized in parallel polymers, and are convenient techniques for preparation of organic-inorganic nanocomposites compared with commercial silicate-intercalation technique. Sizes of formed nanoparticles in a composite can be reduced to 10 nm by choice of relative conditions. Polymer-inorganic materials have high mechanical strength and thermal stability in combination with optimal heat transport properties. They are widely used in practice due to unique physical and chemical properties: incorporation of nanometric inorganic component into polymeric matrix improves mechanical properties of material [4][5][6][7], permeability of polymers [8]. Light-sensitive materials are used in optic and electronic industry, printed-circuit boards, photoconductive cells, as key elements in solid coatings, packing materials, as cover materials they have good transparency [9][10][11]. For example, sol-gel method was used to produce various polymer/TiO 2 composites with high refractive index [12]. Such type of composites are used for chromatographic carriers, membrane materials, these are the main class of plastics for different applications, including airspace. Controlled properties of the surface of these colloid 1 We refer here to the recent review devoted to celebration of 40th anniversary of innovation researches in polymer-inorganic ceramics produced by sol-gel technique [1].

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“…Organic–inorganic hybrids that combine organic and inorganic segments at a nanometer level have attracted attention in both academia and industry, because they possess not only the sum of individual properties of the organic and inorganic phases but different and unique properties derived from the large volume fraction of interfaces . Among them, hybrid materials composed of organic polymers and inorganic fillers have been widely studied as promising approaches to improve material properties such as thermal resistance and physical properties compared to the individual components.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of single component element‐block materials based on siloxane‐based cage frameworks

Naka

Irie

2016

Polymer International

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This mini-review focuses on recent efforts to prepare single component element-block materials based on siloxane-based cage frameworks, a promising approach to control the sequence of organic and inorganic segments in organic-inorganic hybrids at the molecular level. Polyhedral octasilsesquioxanes, denoted (RSiO 1.5 ) 8 or labeled T 8 cages, and octadimethylsiloxy-Q 8 cages, denoted (RSiMe 2 OSiO 1.5 ) 8 , are used here as siloxane-based cage frameworks. Thermoplastic optically transparent silsesquioxane materials derived from a single cage compound can be obtained with dumbbell-and star-shaped cage structures, allowing precise design of their structures for tuning properties. The siloxane-based cage core dendrimers are ideal candidates for single component element-block materials which possess three-dimensional, well-defined molecular level structures. Their rigid and cubic inorganic frameworks provide unique features for siloxane-based cage core dendrimers. These topics attract attention in both academia and industry.

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Preparation of metal oxide or metal nanoparticles in silica via metal coordination to organofunctional trialkoxysilanes

Cited by 17 publications

References 17 publications

A Seedless Method for Gold Nanoparticle Growth inside a Silica Matrix: Fabrication of Materials Capable of Third‐Harmonic Generation in the Near‐Infrared

A Seedless Method for Gold Nanoparticle Growth inside a Silica Matrix: Fabrication of Materials Capable of Third‐Harmonic Generation in the Near‐Infrared

Physics and Chemistry of Sol-Gel Nanocomposites Formation

Synthesis of single component element‐block materials based on siloxane‐based cage frameworks

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