Synthesis of Hollow Silica Particle by Combination of Bubble Templating Method and Sol-Gel Transformation

2006 ◽  
Vol 11-12 ◽  
pp. 673-676 ◽  
Author(s):  
Yong Sheng Han ◽  
Y. Tarutani ◽  
Masayoshi Fuji ◽  
Minoru Takahashi
Keyword(s):  
Hydrochloric Acid ◽  
Silica Particle ◽  
Capillary Tube ◽  
Sol Gel ◽  
Silica Sol ◽  
Gel Point ◽  
Hollow Silica ◽  
Templating Method ◽  
Hollow Particles ◽  
Water Alcohol

The feasibility of bubble templating method to prepare hollow particles was tested in this paper by passing a bubble into a silica sol. The silica sol was prepared by mixing TEOS, water, alcohol and hydrochloric acid. To control the gel point, the reactants and their concentrations were varied in each experiment. After the sol was prepared, an ammonia bubble was introduced into the prepared sol through a capillary tube. With the catalysis of ammonia, the silica sol gelled on the surface of bubble and formed a hollow gel particle. The nucleation of silica gel on the surface of bubble was discussed in this paper.

scholarly journals Ethylene-bridged polysilsesquioxane/hollow silica particle hybrid film for thermal insulation material

RSC Advances ◽  
2021 ◽  
Vol 11 (40) ◽  
pp. 24968-24975
Author(s):  
Satoru Tsukada ◽  
Yuki Nakanishi ◽  
Takashi Hamada ◽  
Kenta Okada ◽  
Susumu Mineoi ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Thermal Insulation ◽  
Silica Particle ◽  
Hybrid Film ◽  
Sol Gel ◽  
Insulation Material ◽  
Hybrid Films ◽  
Hollow Silica ◽  
Bridged Polysilsesquioxane ◽  
Hollow Silica Particles

Ethylene-bridged polysilsesquioxane/hollow silica particle hybrid films were prepared by the sol–gel reaction. The hybrid film containing hollow silica particles exhibited good thermal insulation properties and thermal stability.

scholarly journals Fractal Structure and Fractal Time in Silica Sol-Gels

1990 ◽  
Vol 180 ◽  
Author(s):  
James E. Martin ◽  
Jess Wilcoxon
Keyword(s):  
Light Scattering ◽  
Sol Gel ◽  
Silica Sol ◽  
Density Fluctuations ◽  
Gel Point ◽  
Decay Times ◽  
Fractal Time ◽  
Sol Gel Transition ◽  
Point Light ◽  
Gel Transition

ABSTRACTNear the gel point, light scattering studies of silica sol-gels reveal fractal clusters whose size diverges as a power law, in accord with the predictions of percolation theory. More surprising is the appearance of a fractal time description of the dynamics of these clusters. This novel dynamics has recently been revealed by quasielastic light scattering from the density fluctuations that occur at the sol-gel transition. Since the relaxation of fluctuations in these branched polymer systems is self-similar, decay processes occur on all time scales (fractal time), and average decay times diverge. An interpretation of this observation will be presented that relies on a length-scale-dependent viscosity and the geometrical self-similarity of the sol-gel transition. The scattering theory is extended to the calculation of time- and frequency-dependent viscoelastic properties, as well as mechanical properties such as the shear modulus, steady state creep compliance, and viscosity. The viscoelastic predictions are found to be in good agreement with experimental data.

Macrocellular Titanosilicate Monoliths as Highly Efficient Structured Olefin Epoxidation Catalysts

2019 ◽  
Author(s):  
Valentin Smeets ◽  
Ludivine van den Biggelaar ◽  
Tarek Barakat ◽  
Eric M. Gaigneaux ◽  
Damien Debecker
Keyword(s):  
Sol Gel ◽  
Silica Matrix ◽  
Flow Mode ◽  
Tetrahedral Coordination ◽  
Excellent Performance ◽  
One Pot ◽  
Templating Method ◽  
Porous Texture ◽  
Internal Phase ◽  
Epoxidation Of Cyclohexene

Self-standing macrocellular titanosilicate monolith foams are obtained using a one-pot sol-gel route and show excellent performance in the epoxidation of cyclohexene. Thanks to the High Internal Phase Emulsion (HIPE) templating method, the materials feature a high void fraction, a hierarchically porous texture and good mechanical strength. Highly dispersed Ti species can be incorporated in tetrahedral coordination the silica matrix. These characteristics allow the obtained ‘SiTi(HIPE)’ materials to reach high catalytic turnover in the epoxidation of cyclohexene. The monoliths can advantageously be used to run the reaction in continuous flow mode.<br>

scholarly journals A simple approach to prepare fluorescent molecularly imprinted nanoparticles

RSC Advances ◽  
2021 ◽  
Vol 11 (13) ◽  
pp. 7732-7737
Author(s):  
Fenying Wang ◽  
Dan Wang ◽  
Tingting Wang ◽  
Yu Jin ◽  
Baoping Ling ◽  
...  
Keyword(s):  
High Performance ◽  
Low Cost ◽  
Sol Gel ◽  
Silica Sol ◽  
Simple Approach ◽  
Imprinted Polymer ◽  
Molecularly Imprinted ◽  
Low Toxicity ◽  
Good Biocompatibility ◽  
Molecularly Imprinted Nanoparticles

Fluorescent molecularly imprinted polymer (FMIP) gains great attention in many fields due to their low cost, good biocompatibility and low toxicity. Here, a high-performance FMIP was prepared based on the autocatalytic silica sol–gel reaction.

Silica Sol-Gel Supported Nickel Nano-Catalyst for Hydrogen Production Using Microreactors

2005 ◽  
Vol 885 ◽  
Author(s):  
Krithi Shetty ◽  
Shihuai Zhao ◽  
Wei Cao ◽  
Naidu V. Seetala ◽  
Debasish Kuila
Keyword(s):  
Steam Reforming ◽  
Average Pore Size ◽  
Sol Gel ◽  
Supported Catalyst ◽  
Silica Sol ◽  
Average Pore ◽  
Steam Reforming Of Methanol ◽  
Nano Catalyst ◽  
Before And After ◽  
Reforming Reactions

ABSTRACTThe goal of this research is to investigate the activities of a non-noble nano-catalyst (Ni/SiO2) using Si-microreactors for steam reforming of methanol to produce hydrogen for fuel cells. The supported catalyst was synthesized by sol-gel method using Ni (II) salts and Si(C2H5O)4 as starting materials. EDX results indicate that the actual loading of Ni (5-6%) is lower than the intended loading of 12 %. The specific surface area of the silica sol-gel encapsulated Ni nano-catalyst is 452 m2/g with an average pore size of ∼ 3 nm. Steam reforming reactions have been carried out in a microreactor with 50 µm channels in the temperature range of 180-240 °C and atmospheric pressure. Results show 53% conversion of methanol with a selectivity of 74 % to hydrogen at 5 l/min and 200 °C. The magnetic properties of the catalysts were performed using a Vibrating Sample Magnetometer (VSM) to study the activity of the catalysts before and after the steam reforming reactions. The VSM results indicate much higher activity in the microreactor compared to macro-reactor and Ni forms non-ferromagnetic species faster in the microreactor.

Characterization of the Effect of Formamide Additive on the Silica Sol-Gel-Glass Forming Process by1H NMR*

1987 ◽  
Vol 153 (Part_1_2) ◽  
pp. 27-36 ◽  
Author(s):  
H. Rosenberger ◽  
H. Bürger ◽  
H. Schütz ◽  
G. Scheler ◽  
G. Maenz
Keyword(s):  
Sol Gel ◽  
Silica Sol ◽  
Forming Process ◽  
Glass Forming

Silica sol gel assisted defect patching of SSZ-13 zeolite membranes for CO2/CH4 separation

2021 ◽  
pp. 119518
Author(s):  
Azam AYDANI ◽  
Hafez MAGHSOUDI ◽  
Adele BRUNETTI ◽  
Giuseppe BARBIERI
Keyword(s):  
Sol Gel ◽  
Silica Sol ◽  
Zeolite Membranes
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