Facile synthesis of nickel nanoparticles supported on carbon and silica matrix via a novel silica sol–gel process

2013 ◽  
Vol 69 (1) ◽  
pp. 130-136 ◽  
Author(s):  
Lianqiang Xu ◽  
Haifu Huang ◽  
Shaolong Tang ◽  
Leyi Chen ◽  
Ren Xie ◽  
...  
Keyword(s):  
Nickel Nanoparticles ◽  
Sol Gel ◽  
Silica Sol ◽  
Silica Matrix ◽  
Facile Synthesis ◽  
Sol Gel Process

scholarly journals Tuning the structure and the mechanical properties of epoxy–silica sol–gel hybrid materials

RSC Advances ◽  
2016 ◽  
Vol 6 (13) ◽  
pp. 10736-10742 ◽  
Author(s):  
Berta Domènech ◽  
Ignasi Mata ◽  
Elies Molins
Keyword(s):  
Mechanical Properties ◽  
Porous Material ◽  
Hybrid Materials ◽  
Sol Gel ◽  
Silica Sol ◽  
One Pot ◽  
Sol Gel Process

A new epoxy–silica porous material prepared via one-pot sol–gel process. Mechanical properties can be continuously tuned by modifying reactant proportions.

Study on Preparation and Hydrophobicity of MTES Derived Silica Sol and Gel

2012 ◽  
Vol 535-537 ◽  
pp. 2563-2566 ◽  
Author(s):  
Yu Ma ◽  
Hye Ryeon Lee ◽  
Toshinori Tsuru
Keyword(s):  
Reaction Rate ◽  
Sol Gel ◽  
Phase Segregation ◽  
Silica Sol ◽  
Molar Ratio ◽  
Modified Silica ◽  
Sol Gel Process ◽  
One Step ◽  
Inorganic Precursors

The synthesis of hydrophobic sol by one-step sol-gel process ammonia catalyzed was investigated. The water molar ratio and catalyst molar ratio were discussed to prevent phase segregation during the hydrolysis and co-condensation of the organic and inorganic precursors. The reactant system with water molar ratio 70 could make the reaction rate of MTES slightly less than that of TEOS, so that the hydrolysis - condensation – gelling reaction with MTES and TEOS as co-precursors could be synchronously. With the increase of the MTES/TEOS molar ratio, the reaction rate of the silica sol preparation decreased, the hydrophobicity of the sol and gel increased as the molar ratio MTES/TEOS change from 0.5~4. But the hydrophobicity of the methyl-modified silica sol and gel prepared with pure MTES in the sol-gel process were slightly lower than that of the methyl-modified silica sol and gel prepared with MTES and TEOS as co-precursors.

Leaching Behavior of Edta In A Silica Sol-Gel Matrix

1994 ◽  
Vol 346 ◽  
Author(s):  
Kris S. Oka ◽  
J.D. Mackenzie
Keyword(s):  
Pore Volume ◽  
Sol Gel ◽  
Silica Matrix ◽  
Silica Gels ◽  
Volume Distribution ◽  
Leaching Behavior ◽  
Sol Gel Process ◽  
The Matrix ◽  
Physical Changes ◽  
Hydrolysis Of

ABSTRACTEthylene diamine tetra-acetic acid (EDTA) doped silica gels were made by the sol-gel process for the potential application as a filter for heavy metal ions in wastewater. The behavior of the organic molecule in the matrix was studied by investigating the percentage of EDTA leached out with a variation in the timing of addition of the EDTA molecule into the starting silica gel solution. Leach tests using water as the medium were performed for 2, 12 and 24 hours in order to determine the amount of EDTA trapped in the pores or in the matrix. A minimum amount of EDTA leached from the gels was detected in the samples to which EDTA was added 4 hours after initial hydrolysis of TEOS. This result was correlated to having a greater percentage of pore volume in the range of 15–20 Å, which was further substantiated with density measurements. The physical changes in the silica matrix altering the pore volume distribution were attributed to the addition of the water into which the EDTA molecule was initially dissolved.

Facile synthesis of monolithic mayenite with well-defined macropores via an epoxide-mediated sol–gel process accompanied by phase separation

2014 ◽  
Vol 38 (12) ◽  
pp. 5832-5839 ◽  
Author(s):  
Xingzhong Guo ◽  
Xiaobo Cai ◽  
Jie Song ◽  
Yang Zhu ◽  
Kazuki Nakanishi ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Phase Separation ◽  
Sol Gel ◽  
High Porosity ◽  
Macroporous Structure ◽  
Facile Synthesis ◽  
Sol Gel Process

Monolithic mayenite has been successfully prepared via a sol–gel process followed by heat-treatment, exhibiting co-continuous macroporous structure and high porosity.

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