A Simple Synthesis of Mesoporous Silica Hollow Microspheres by Fast Hydrolysis and Condensation of Tetraethyl Orthosilicate

2011 ◽  
Vol 189-193 ◽  
pp. 4335-4338
Author(s):  
Shi Quan Liu ◽  
Jian Cun Rao ◽  
Hai Xia Wang ◽  
Hui Zhao
Keyword(s):  
Mesoporous Silica ◽  
Reaction Medium ◽  
Tetraethyl Orthosilicate ◽  
Hollow Microspheres ◽  
Simple Synthesis ◽  
Simple Reaction ◽  
Volume Contraction ◽  
Silica Source ◽  
Hydrolysis And Condensation

Mesoporous silica hollow microspheres were quickly synthesized with a simple reaction medium which only contains tetraethylorthosilicate (TEOS) as silica source, octylamine (OA) as template and water. It is proposed that a dispersion of TEOS-in-water is formed when water is added into the mixture of TOS and OA. Water becomes basic due to dissolution of OA. Fast hydrolysis and condensation of TEOS then occurs at the interface of droplets lead to the formation of silica shells. Hollows are formed due to the volume contraction caused by the large difference in the densities of condensed silica and liquid TEOS. In addition, OA assembles with silica, templating the nanopores in the silica shells.

Monolithic Macroporous-Mesoporous Carbon Using Ionic Liquids as Carbon Source

2014 ◽  
Vol 988 ◽  
pp. 23-26
Author(s):  
Ai Bing Chen ◽  
Yun Hong Yu ◽  
Yi Feng Yu ◽  
Hai Jun Lv ◽  
Ting Ting Xing ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Carbon Source ◽  
Mesoporous Silica ◽  
Mesoporous Carbon ◽  
Structure Directing Agent ◽  
Silica Source ◽  
Pu Foam ◽  
Silica Materials ◽  
Mesoporous Silica Materials ◽  
Ordered Macroporous

A facile approach is employed for the preparation of hierarchically porous structures monolithic ordered macroporous-mesoporous silica materials (OMS) using the commercially available and cheap polyurethane (PU) foam as monolithic template, triblock copolymer P123 (EO20PO70EO20) as structure-directing agent and tetraethyl orthosilicate (TEOS) as silica source, then monolithic ordered macro porous-mesoporous carbon materials (OMC) is synthesized by using monolithic ordered macroporous-mesoporous silica materials as hard template and ionic liquids as the carbon source. The silica and carbon monoliths possess uniform pore sizes (3.74-3.84 nm) and ordered mesostructure.

Photocatalytic Degradation of Organics Diluted in Water Using TiO2 Loaded on Fluoride-Modified Mesoporous Silica

2007 ◽  
Vol 544-545 ◽  
pp. 115-118
Author(s):  
Shinichi Kawasaki ◽  
Yusuke Okada ◽  
Shuai Yuan ◽  
Kohsuke Mori ◽  
Hiromi Yamashita
Keyword(s):  
Mesoporous Silica ◽  
Photocatalytic Degradation ◽  
Organic Compounds ◽  
Photocatalytic Performance ◽  
Tetraethyl Orthosilicate ◽  
Photocatalytic Reaction ◽  
Fluoride Ions ◽  
Reaction Field

The synthesis of the hydrophobic mesoporous silica MS(F) was performed using tetraethyl orthosilicate, triethoxyfluorosilane as the source of the fluoride and dodecylamine as templates. The TiO2 loaded on the hydrophobic MS(F) (TiO2/MS(F)) exhibited the efficient photocatalytic performance for the degradation of alcohols (iso-butanol) diluted in water. The photocatalytic reactivity for the degradation increased with increasing the content of fluoride ions on these photocatalysts. The hydrophobic mesoporous surface is suitable as the photocatalytic reaction field for the degradation of organic compounds diluted water.

Synthesis of α-aminophosphonates using a mesoporous silica catalyst produced from sugarcane bagasse ash

RSC Advances ◽  
2016 ◽  
Vol 6 (29) ◽  
pp. 23981-23986 ◽  
Author(s):  
Arthur F. Boza ◽  
Vicente L. Kupfer ◽  
Aline R. Oliveira ◽  
Eduardo Radovanovic ◽  
Andrelson W. Rinaldi ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Green Synthesis ◽  
Sugarcane Bagasse ◽  
Mesoporous Material ◽  
Synthesis Route ◽  
Silica Source ◽  
Sugarcane Bagasse Ash

A new green synthesis route is proposed for obtaining a mesoporous material using sugarcane bagasse ash as the silica source.

scholarly journals Hollow nanoreactors for Pd-catalyzed Suzuki–Miyaura coupling and O-propargyl cleavage reactions in bio-relevant aqueous media

2019 ◽  
Vol 10 (9) ◽  
pp. 2598-2603 ◽  
Author(s):  
Paolo Destito ◽  
Ana Sousa-Castillo ◽  
José R. Couceiro ◽  
Fernando López ◽  
Miguel A. Correa-Duarte ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Palladium Nanoparticles ◽  
Aqueous Media ◽  
Hollow Microspheres ◽  
Cleavage Reactions

We describe the fabrication of hollow microspheres consisting of mesoporous silica nanoshells decorated with an inner layer of palladium nanoparticles and their use as Pd-nanoreactors in aqueous media.

Rhodamine 6G Encapsuled Mesoporous Silica Channels

2008 ◽  
Vol 55 ◽  
pp. 62-67 ◽  
Author(s):  
Priscila Samara Saran ◽  
Marco Antonio Utrera Martines ◽  
Hermi Felinto de Brito ◽  
Gustavo Rocha de Castro ◽  
Younes Messaddeq ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Pore Size ◽  
Rhodamine 6G ◽  
Emission Spectra ◽  
Visible Absorption ◽  
Surfactant Micelles ◽  
Absorption And Emission ◽  
X Ray Scattering ◽  
Silica Source ◽  
Rhodamine Dye

We report the effect of solvent on the rhodamine 6G encapsuled into channels of mesoporous silica, synthesized by two-step process that gives intermediary stable hybrid micelles. Mesoporous materials have been obtained by the method that involves surfactant micelles (mainly cationic) and inorganic precursor of the structure to be obtained. MSU-X type mesoporous silica has been synthesized with polyethylene oxide surfactant as the directing-structure agent and tetraethyl orthosilicate Si(OEt)4 as the silica source. The influence of the solvent on the encapsulation of rhodamine dye was systematically explored, specially its influence on the luminescence properties. Rhodamine 6G encapsuled into mesoporous silica channel was characterized by UV-Vis and luminescence spectroscopies, scanning electron microscopy, small angle x ray scattering and N2 sorption-desorption. The pore size and the solvent effects into luminescence dye encapsuled into mesoporous silica channels are observed in the visible absorption and emission spectra of rhodamine 6G. The intense photoluminescence band of rhodamine 6G dye is in 500 to 600 nm region. The observed shift of the absorption and emission bands can be assigned to the effect of the solvents dielectric constant and pore size of mesoporous silica.

Swift Synthesis of Hierarchically Ordered Mesocellular Mesoporous Silica by Microwave-Assisted Hydrothermal Method

2008 ◽  
Vol 8 (8) ◽  
pp. 3995-3998 ◽  
Author(s):  
You-Kyong Seo ◽  
I. Suryanarayana ◽  
Young Kyu Hwang ◽  
Namsoo Shin ◽  
Do-Cheon Ahn ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Microwave Irradiation ◽  
Pore Size ◽  
Hydrothermal Method ◽  
Aging Time ◽  
Micropore Volume ◽  
Mesoporous Silicas ◽  
Microwave Assisted ◽  
Silica Source ◽  
Size And Morphology

Hierarchically ordered mesocellular mesoporous silicas (HMMS) were swiftly synthesized using P123 and sodium silicate as a silica source within an hour by applying microwave irradiation without pore expander. The XRD, TEM and BET studies demonstrated that materials as-synthesized and calcined have the hierarchically ordered mesocellular structure with two different sizes about 10 nm and 30 nm pores having a minimized micropore volume compared with conventional hydrothermal method. Moreover, the HMMS sample prepared by microwave-assisted hydrothermal method had higher surface area than that of conventional hydrothermal method. The variation of the pore size and morphology of mesocellular structure varied with the aging time.

Simple Synthesis of Hierarchically Ordered Mesocellular Mesoporous Silica Materials Hosting Crosslinked Enzyme Aggregates

Small ◽  
2005 ◽  
Vol 1 (7) ◽  
pp. 744-753 ◽  
Author(s):  
Jinwoo Lee ◽  
Jungbae Kim ◽  
Jaeyun Kim ◽  
Hongfei Jia ◽  
Moon Il Kim ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Simple Synthesis ◽  
Silica Materials ◽  
Mesoporous Silica Materials

Template Sol-Gel Synthesis of Phosphorescent Mesoporous Silica Film Nanocomposites Using an Amphiphilic Gold (I) Pyrazolate Complex

2011 ◽  
Vol 364 ◽  
pp. 55-59 ◽  
Author(s):  
Hendrik O. Lintang ◽  
Kazushi Kinbara ◽  
Takuzo Aida
Keyword(s):  
Mesoporous Silica ◽  
Sol Gel ◽  
Silica Film ◽  
Aqueous Alcohol ◽  
Molar Ratios ◽  
Silica Source ◽  
Aqueous Alcohol Solution ◽  
Mesoporous Silica Film ◽  
Sol Gel Synthesis ◽  
Film Nanocomposites

Herein novel mesoporous silica film nanocomposites are successfully synthesized by using phosphorescent columnar assembly of an amphiphilic trinuclear gold (I) pyrazolate complex [Au3Pz3] as a functional template in the sol-gel synthesis. By controlling the molar ratios of silica source tetrabutylorthosilicate (TBOS) to [Au3Pz3] in an acidic aqueous alcohol solution from 60:1 to 20:1, highly ordered phosphorescent nanocomposites can be fabricated with hexagonal [Au3Pz3]/silicahexand lamellar [Au3Pz3]/silicalamsilicates.

Sign in / Sign up

Export Citation Format

Share Document