Synthesis of Nano Grade Hollow Silica Sphere via a Soft Template Method

2008 ◽  
Vol 8 (6) ◽  
pp. 3097-3100 ◽  
Author(s):  
Ming-Shyong Tsai ◽  
Miao Ju Li ◽  
Fu-Hsu Yen
Keyword(s):  
Specific Surface ◽  
Porous Structure ◽  
Colloidal Silica ◽  
Solvent System ◽  
Silica Sphere ◽  
Soft Template ◽  
Template Method ◽  
Hollow Silica ◽  
The Mean ◽  
Outside Diameter

The nano grade hollow silica sphere (HSS) was synthesized by a novel soft template method. We found that the precipitate of aluminate had a porous structure that could be the soft template for HSS. After mixing the colloidal silica with the aluminate precipitate, the bubble trapped in this porous structure could form the nano grade HSS. The aluminate precipitate was removed by adjusting the pH of the slurry to ∼1. The outside diameter, the specific surface, and the mean pore size diameter of the forming HSS were 60∼90 nm, 571 m2/g, and 3 nm, respectively. The formed HSS was collected by modifying the surface with Si(OCH3)3CHCH2 (VTMO) and then filtrating the precipitated gel in the n-butanol and ethanol solvent system.

Preparation of Hollow Silica Microspheres with Nanoporous Shells by Soft Template Method

2014 ◽  
Vol 602-603 ◽  
pp. 63-66 ◽  
Author(s):  
Xue Ye Sui ◽  
Jie Xu ◽  
Chong Hai Wang ◽  
Chang Ling Zhou ◽  
Rui Xiang Liu
Keyword(s):  
Specific Surface ◽  
Pore Volume ◽  
Smooth Surface ◽  
Tetraethyl Orthosilicate ◽  
Soft Template ◽  
Template Method ◽  
Silica Spheres ◽  
Silica Microspheres ◽  
Hollow Silica ◽  
Hydrolysis And Condensation

A kind of new hollow silica microspheres were proposed in experiment, which are fabricatted by a fast hydrolysis and condensation of tetraethyl orthosilicate taking place around multi-lamellar octylamine vesicles. The morphology of the vesicles is then fixed by a quick gelation process, resulting in hollow organo-silica spheres. After the removal of the template by calcination, nanopores are formed in the hollow shells. The results show that the synthesized hollow silica microspheres have smooth surface and dispersed well£®There are bimodal nanopores in the hollow silica microspheres, with a diameter of 2.1 nm and 0.62nm for the mesopores and micropores respectively, giving a specific surface area of 1123m2/g and a pore volume of 0.6291mL/g£®

Preparation of Hollow Silica Spheres by Soft Template Method

2018 ◽  
Vol 279 ◽  
pp. 124-129
Author(s):  
Zhi Qiang Sun ◽  
Hua Dong Wang ◽  
Heng Dong ◽  
Shu Qin Li ◽  
Yi Lu
Keyword(s):  
Thin Shell ◽  
Shell Thickness ◽  
Soft Template ◽  
Template Method ◽  
Silica Spheres ◽  
Low Density ◽  
Hollow Silica ◽  
Hollow Silica Spheres ◽  
Structure Phase ◽  
Promising Application

Hollow silica spheres (HSS) are prepared via soft template method. The morphology, internal structure, phase composition, particle size distribution and porosity of HSSs are characterized. It is found that the amorphous HSSs with thin shell thickness and density of around 0.41 g/cm3 have good sphericity and are relatively uniform in size. Most importantly, the size of the synthesized spheres is controlled successfully via stirring rate, and the linear fitting equation is described as d50 = -0.45 × R + 206. This research provides a facile way to produce HSS with low density which has promising application in many fields.

scholarly journals Catalytic wet peroxide degradation of acrylonitrile wastewater by ordered mesoporous Ag/CeO2: synthesis, performance and kinetics

RSC Advances ◽  
2021 ◽  
Vol 11 (26) ◽  
pp. 15959-15968
Author(s):  
Guozheng Zhao ◽  
Hui Liang ◽  
Hongzhu Xu ◽  
Changbo Li ◽  
Qingwei Tan ◽  
...  
Keyword(s):  
Soft Template ◽  
Template Method ◽  
Microwave Assisted ◽  
Ordered Mesoporous

Ordered mesoporous Ag/CeO2 catalysts have been successfully synthesized by a microwave assisted soft template method.

Hollow and porous palladium nanocrystals: synthesis and electrocatalytic application

2015 ◽  
Vol 3 (44) ◽  
pp. 21995-21999 ◽  
Author(s):  
Gengtao Fu ◽  
Mingxing Gong ◽  
Yawen Tang ◽  
Lin Xu ◽  
Dongmei Sun ◽  
...  
Keyword(s):  
Methanol Oxidation ◽  
Electrocatalytic Activity ◽  
Oxidation Reaction ◽  
Soft Template ◽  
Template Method ◽  
Methanol Oxidation Reaction

Porous Pd nanobowls are synthesized via a facile bubble soft-template method, showing the outstanding electrocatalytic activity for methanol oxidation reaction.

Sewage-free preparation of 2D metal oxides by a rapid freezing soft template method for extraordinarily activating solar-driven humidity VOC combustion

2021 ◽  
Author(s):  
Dachao Yuan ◽  
Luping Ma ◽  
Jianguo Zhao ◽  
Xianhua Bai ◽  
Jianchang Li ◽  
...  
Keyword(s):  
Metal Oxides ◽  
Combustion Efficiency ◽  
Soft Template ◽  
Template Method ◽  
Rapid Freezing ◽  
Selective Coating ◽  
Spectrally Selective ◽  
Voc Combustion

2D Co3O4 can be synthesized without producing sewage, which shows a nearly 100% ambient sunlight irradiated combustion efficiency for formaldehyde, CH4, acetone, CO, as it assisted by spectrally selective coating.

Preparation of mesoporous batatas biochar via soft-template method for high efficiency removal of tetracycline

2021 ◽  
pp. 147397
Author(s):  
Zhihong Zheng ◽  
Baolong Zhao ◽  
Yiping Guo ◽  
Yujie Guo ◽  
Tannaz Pak ◽  
...  
Keyword(s):  
High Efficiency ◽  
Soft Template ◽  
Template Method

scholarly journals Selective porous gates made from colloidal silica nanoparticles

2015 ◽  
Vol 6 ◽  
pp. 2105-2112 ◽  
Author(s):  
Roberto Nisticò ◽  
Paola Avetta ◽  
Paola Calza ◽  
Debora Fabbri ◽  
Giuliana Magnacca ◽  
...  
Keyword(s):  
Silica Nanoparticles ◽  
Spin Coating ◽  
Colloidal Silica ◽  
Sol Gel ◽  
Chemical Species ◽  
Solvent System ◽  
Porous Films ◽  
Nanoporous Films ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

Highly selective porous films were prepared by spin-coating deposition of colloidal silica nanoparticles on an appropriate macroporous substrate. Silica nanoparticles very homogenous in size were obtained by sol–gel reaction of a metal oxide silica precursor, tetraethyl orthosilicate (TEOS), and using polystyrene-block-poly(ethylene oxide) (PS-b-PEO) copolymers as soft-templating agents. Nanoparticles synthesis was carried out in a mixed solvent system. After spin-coating onto a macroporous silicon nitride support, silica nanoparticles were calcined under controlled conditions. An organized nanoporous layer was obtained characterized by a depth filter-like structure with internal porosity due to interparticle voids. Permeability and size-selectivity were studied by monitoring the diffusion of probe molecules under standard conditions and under the application of an external stimulus (i.e., electric field). Promising results were obtained, suggesting possible applications of these nanoporous films as selective gates for controlled transport of chemical species in solution.

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