Gel-silica optics: Theory and application

Hench, Larry L.; Araújo, Fernando Gabriel da Silva; West, Jon K.; Torre, J. Pablo La

doi:10.1007/bf00486326

Cited by 22 publications

(8 citation statements)

References 18 publications

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“…Considerable interest has been shown in the general area of sol-gel chemistry in the past decades, like the MCM-41s family mesostructured silica. 1 Their intrinsic properties, such as high surface area, high pore volume, and narrow pore size distribution, make them particularly promising materials in a broad range of applications, ranging from catalysis 2 and chemical separation technology 3 to biosensors. 4 Purely periodic mesoporous silica, however, is greatly limited due to restricted surface functionality and poor mechanical property.…”

Section: Introductionmentioning

confidence: 99%

Oligoaniline-Contained Electroactive Silsesquioxane Precursor for Synthesizing Novel Siliceous Materials

et al. 2007

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As analogues of the well-known conducting polymer polyaniline, aniline oligomers have been extensively investigated because of their well-defined structure, good solubility, and electroactivity. In this study, we demonstrated for the first time the successful and high-yield synthesis of a novel electroactive organo-bridged silsesquioxane precursor, N,N′-bis(4′-(3-triethoxysilylpropyl-ureido)phenyl)-1,4-quinonenediimine (TSUPQD), which covalently incorporates the emeraldine form of amine-capped aniline trimer into silica frameworks via one-step coupling reaction with triethoxysilylpropyl isocyanate (TESPIC) under a mild condition. Subsequently, detailed characteristics of the resulting silsesquioxane compound along with morphological measurement were systematically studied by using spectroscopic methods, such as Fourier-transform infrared (FTIR) spectra, mass spectra (MS), nuclear magnetic resonance (NMR) spectroscopy, and X-ray powder diffraction (XRD). In addition, its electrochemical behavior was explored by UV-vis spectra and cyclic voltammetry showing that its intrinsic electroactivity was maintained upon protonic acid doping and presented two distinct oxidative states in reversible cyclic voltammetry, similar to that of polyaniline. Furthermore, the sol-gel reactions of TSUPQD with various amounts of tetraethyl orthosilicate (TEOS) were carried out to afford new electroactive hybrid siliceous materials whose properties were also studied.

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Section: Introductionmentioning

confidence: 99%

Oligoaniline-Contained Electroactive Silsesquioxane Precursor for Synthesizing Novel Siliceous Materials

et al. 2007

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“…In addition to the relatively low acidity and short gelation time, large average pore diameter and pore volume are notable in the HF-catalyzed gel. Such large pore sizes and volumes are common in HF-catalyzed gels [9,[176][177][178]. Thus, drying without fracture is easier for silica gels catalyzed by HF than for those catalyzed by conventional acids.…”

Section: Properties Of Hf-catalyzed Gelsmentioning

confidence: 99%

Recent advances in sol–gel synthesis of monolithic silica and silica-based glasses

Kajihara

2013

Journal of Asian Ceramic Societies

132

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Studies on sol-gel synthesis of monolithic silica and silicate glasses are summarized. Major research efforts have been devoted to avoid the fracture problems, associated with the extensive shrinkage of wet gels during drying. Supercritical drying, incorporation of silica fillers, and reduction of the surface tension of pore liquid have been used to form monolithic dried gels without fracture. More recent studies have shown that wet gels derived from alkoxides can be dried in a relatively short time without fracture at ambient pressure, by employing controlled drying accompanied by the cavitation of the pore liquid, macroscopic phase separation in parallel with gelation, and fluorine modification. By optimizing the synthesis procedure, it is also possible to reduce the use of reagents such as external alcohols, organic solvents, and other additives, which are removed during synthesis and are unnecessary in the final products. Another subject of considerable interest is the development of silica-based functional glasses that are difficult to form by conventional melt-quench and vapor-phase methods, by taking advantage of melt-free processes conducted at relatively low temperatures. Most of the recent studies on the functionalization of sol-gel-derived silica glasses are concerned with the doping of nanoparticles, rare earth ions, and/or fluorine.

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“…Conventional sol-gel synthesis method [46] was developed to prepare photocatalyst libraries in powder form by some specific instruments [21][22][23][24][25]. Maier's group [21,22] synthesized the potential photocatalysts in 45 transparent HPLC glass flasks by means of a synthesis robot shown in Fig.…”

Section: Synthesis Of Powdersmentioning

confidence: 99%

Application of Parallel Synthesis and High Throughput Characterization in Photocatalyst Discovery

Sun¹,

Ding²,

Bao³

et al. 2011

CCHTS

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The last decade has seen significant progresses in the application of combinatorial approaches and high-throughput screening in photocatalyst discovery. This paper aims at providing a comprehensive review on the parallel synthesis and high-throughput characterization of photocatalysts, including the development of instrumentation, strategy of experiment, preparation of libraries, high-throughput screening technique and data analysis. The review ends with a summary of the remaining challenges and prospects on combinatorial photocatalyst discovery.

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Gel-silica optics: Theory and application

Cited by 22 publications

References 18 publications

Oligoaniline-Contained Electroactive Silsesquioxane Precursor for Synthesizing Novel Siliceous Materials

Oligoaniline-Contained Electroactive Silsesquioxane Precursor for Synthesizing Novel Siliceous Materials

Recent advances in sol–gel synthesis of monolithic silica and silica-based glasses

Application of Parallel Synthesis and High Throughput Characterization in Photocatalyst Discovery

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