scholarly journals Pyromellitic diamide-diacid bridged mesoporous organosilica nanospheres with controllable morphologies: A novel PMO for the facile and expeditious synthesis of imidazole derivatives

2021 ◽  
Author(s):  
Ehsan Valiey ◽  
Mohammad G. Dekamin
Keyword(s):  
Pore Size ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Imidazole Derivatives ◽  
Mesoporous Organosilica ◽  
Uniform Pore Size

In this work, novel pyromellitic diamide-diacid bridged mesoporous organosilica (PMAMOS) nanospheres with controllable morphologies and active catalytic centers were designed and prepared with high surface area and uniform pore size...

Silica Supported Mesoporous Titania: A Green Catalyst for Removing Environmental Pollutants and Generating Green Energy

2014 ◽  
Vol 925 ◽  
pp. 694-698 ◽  
Author(s):  
Sharifah Bee Abd Hamid ◽  
S.M. Azad Hossain ◽  
Md Eaqub Ali
Keyword(s):  
Solar Cells ◽  
Pore Size ◽  
Surface Area ◽  
Inorganic Compounds ◽  
High Surface ◽  
High Surface Area ◽  
Environmental Pollutants ◽  
Band Gap Energy ◽  
Green Energy ◽  
Uniform Pore Size

Titania (TiO2) is one of the most unique catalysts, crucially important in photo-green chemistry. The mesoporous TiO2 has large surface area, uniform pore size and open frameworks for the transfer of mass and charges. TiO2 has photocatalytic activity which can degrade both organic and inorganic compounds. The band gap energy of TiO2 can be modified by doping various metal oxides to make it tunable for application in solar cells. Various catalytic metals such as Au, Pt and Pd can be synthesized on TiO2 surface to enlarge its application in various catalytic molecular transformations. Thus TiO2 has promising application in the production of the renewable energy, degradation of environmentally hazardous components, generation of solar cells and sensors. A large number of efforts have been made to synthesize mesoporous TiO2 materials with high surface area and uniform pore size. However, they were not cost effective for applications in environment and green energy generation. The photocatalytic actions of TiO2 can further kill or transform harmful microorganisms into harmless or less harmful ones. This paper reviewed synthesis methodology of silica supported mesoporous TiO2 and their applications in environmental photocatalysis and solar cells.

High Surface Area, Mesoporous, Glassy Alumina with a Controllable Pore Size by Nanocasting from Carbon Aerogels

2005 ◽  
Vol 11 (5) ◽  
pp. 1658-1664 ◽  
Author(s):  
Wen-Cui Li ◽  
An-Hui Lu ◽  
Wolfgang Schmidt ◽  
Ferdi Schüth
Keyword(s):  
Pore Size ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Carbon Aerogels

scholarly journals Synthesis and characterization of porous silica and polyaniline-porous silica composite materials with high surface area

2014 ◽  
Vol 49 (1) ◽  
pp. 1-8
Author(s):  
US Akhtar ◽  
MK Hossain ◽  
MS Miran ◽  
MYA Mollah
Keyword(s):  
Electron Microscopy ◽  
Pore Size ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Porous Silica ◽  
Nitrogen Adsorption ◽  
High Specific Surface Area ◽  
Molar Ratio ◽  
Cylindrical Pore

Porous silica materials were synthesized from tetraethyl orthosilicate (TEOS) using Pluronic P123 (non-ionic triblock copolymer, EO20PO70O20) as template under acidic conditions which was then used to prepare polyaniline (PAni) and porous silica composites (PAnisilica) at a fixed molar ratio. These materials were characterized by nitrogen adsorption-desorption isotherm measured by Barrett-Joyner- Halenda (BJH) method and pore size distribution from desorption branch and surface area measured by the Brunauer-Emmett-Teller (BET) method, scanning electron microscopy (SEM), transmission electron microscopy (TEM), TEM-energy dispersive X-ray (EDX) and Fourier transform infrared (FT-IR) spectroscopy. The composite maintains its structure even after the polymerization and the polymer is dispersed on the inorganic matrix. The rod-like porous silica was about 1?m to 1.5 ?m long and on an average the diameter was in the range of 300- 500 nm. The SEM and TEM images show well ordered 2d hexagonal pore, high specific surface area (850 m2g-1) and uniform pore size of ca. 6.5 nm in diameter. After incorporation of PAni inside the silica pore, framework of porous silica did not collapse and the surface area of the composite was as high as 434 m2g-1 which was 5.5 time higher than our previous report of 78.3 m2g-1. Due to shrinkage of the framework during the incorporation of aniline inside the silica, the pore diameter slightly increase to 7.5 nm but still showing Type IV isotherm and typical hysteresis loop H1 implying a uniform cylindrical pore geometry. DOI: http://dx.doi.org/10.3329/bjsir.v49i1.18847 Bangladesh J. Sci. Ind. Res. 49(1), 1-8, 2014

Transient laser heating induced hierarchical porous structures from block copolymer–directed self-assembly

Science ◽  
2015 ◽  
Vol 349 (6243) ◽  
pp. 54-58 ◽  
Author(s):  
Kwan Wee Tan ◽  
Byungki Jung ◽  
Jörg G. Werner ◽  
Elizabeth R. Rhoades ◽  
Michael O. Thompson ◽  
...  
Keyword(s):  
Pore Size ◽  
Surface Area ◽  
Self Assembly ◽  
Laser Heating ◽  
Shape Control ◽  
High Surface ◽  
Polymer Network ◽  
High Surface Area ◽  
Porous Polymer ◽  
Hierarchical Porous

Development of rapid processes combining hierarchical self-assembly with mesoscopic shape control has remained a challenge. This is particularly true for high-surface-area porous materials essential for applications including separation and detection, catalysis, and energy conversion and storage. We introduce a simple and rapid laser writing method compatible with semiconductor processing technology to control three-dimensionally continuous hierarchically porous polymer network structures and shapes. Combining self-assembly of mixtures of block copolymers and resols with spatially localized transient laser heating enables pore size and pore size distribution control in all-organic and highly conducting inorganic carbon films with variable thickness. The method provides all-laser-controlled pathways to complex high-surface-area structures, including fabrication of microfluidic devices with high-surface-area channels and complex porous crystalline semiconductor nanostructures.

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