Inorganic−Organic Hybrid Membranes with Anhydrous Proton Conduction Prepared from 3-Aminopropyltriethoxysilane and Sulfuric Acid by the Sol−Gel Method

2006 ◽  
Vol 128 (51) ◽  
pp. 16470-16471 ◽  
Author(s):  
Teruaki Tezuka ◽  
Kiyoharu Tadanaga ◽  
Akitoshi Hayashi ◽  
Masahiro Tatsumisago
Keyword(s):  
Sulfuric Acid ◽  
Sol Gel ◽  
Proton Conduction ◽  
Hybrid Membranes ◽  
Gel Method ◽  
Sol Gel Method ◽  
Organic Hybrid ◽  
Anhydrous Proton Conduction

Proton conductive inorganic–organic hybrid membranes prepared from 3-aminopropyltriethoxysilane and phosphoric acid by the sol–gel method

2008 ◽  
Vol 179 (21-26) ◽  
pp. 1151-1154 ◽  
Author(s):  
Teruaki Tezuka ◽  
Kiyoharu Tadanaga ◽  
Akitoshi Hayashi ◽  
Masahiro Tatsumisago
Keyword(s):  
Phosphoric Acid ◽  
Sol Gel ◽  
Hybrid Membranes ◽  
Gel Method ◽  
Sol Gel Method ◽  
Organic Hybrid

Homogeneous liquid crystal alignment on inorganic–organic hybrid silica thin films derived by the sol–gel method

Soft Matter ◽  
2012 ◽  
Vol 8 (5) ◽  
pp. 1437-1442 ◽  
Author(s):  
Soo Sang Chae ◽  
Byoung Har Hwang ◽  
Woo Soon Jang ◽  
Jin Young Oh ◽  
Jee Ho Park ◽  
...  
Keyword(s):  
Thin Films ◽  
Liquid Crystal ◽  
Sol Gel ◽  
Gel Method ◽  
Homogeneous Liquid ◽  
Sol Gel Method ◽  
Liquid Crystal Alignment ◽  
Organic Hybrid ◽  
Hybrid Silica ◽  
Crystal Alignment

Synthesis of Silica Gel and Development of Coating Method for Applications in a Regenerative Air Dehumidifier

2016 ◽  
Vol 839 ◽  
pp. 70-74
Author(s):  
Winit Aimjaijit ◽  
Pipat Chaiwiwatworakul ◽  
Surawut Chuangchote
Keyword(s):  
Sulfuric Acid ◽  
Heat Exchanger ◽  
Surface Area ◽  
Silica Gel ◽  
Sol Gel ◽  
Dip Coating ◽  
Moisture Adsorption ◽  
Air Conditioners ◽  
Gel Method ◽  
Sol Gel Method

In order to control humidity in air conditioning system, various desiccants are used to dehumidify air in air conditioners. One of simple methods, which can be used to coat desiccant materials on surface of heat exchanger in air conditioners, is dip coating. Typical, desiccants used in dehumidifying system is silica gel in a form of solid-state powder. This powder has low adhesion with the heat exchanger surface. To improve adhesion of the silica gel powder, some glue is generally applied on the surface of heat exchanger. The dehumidification properties of silica gel, however, will be remarkably reduced because of less surface area of silica gel powder. Instead of silica powder, this work aims to synthesize silica gel using sol-gel method, which the sol-state material can be suitably used in dip coating. In experimental study, silica gel was synthesized by sol-gel method of precursors with 1 M sulfuric acid (H2SO4). The pH was adjusted using sodium silicate solution (Na2O(SiO2)x.xH2O) and rinsing with DI water. Surface area, pore volume and size, phase composition, morphology, and percentage of moisture adsorption of the synthesized silica gel were characterized. Silica gel fabricated with pH 5 showed the highest percentage of moisture adsorption compared with other samples. In addition to the highest percentage, silica gel with pH 5 could adsorb water up to 28 times of its own weight. X-ray diffraction (XRD) results showed that Na2SO4 impurity were successfully eliminated after rinsing with DI water more than 4 times. Finally, adhesive property of silica gel on aluminium-fin samples was tested with scalloped tape-test method. It was observed that, to improve the adhesion property of silica gel on the aluminium fins, prior to dipping of silica gel, the fins should be etched with sulfuric acid. The acid can adjust the surface of fines to be much rougher.

Friedel-Crafts Alkylation of Resorcinol over Mesoporous Alumina Loaded with Sulfuric Acid

2010 ◽  
Vol 8 (1) ◽  
Author(s):  
Sheela Chandren ◽  
Zainab Ramli ◽  
Hadi Nur
Keyword(s):  
Sulfuric Acid ◽  
Sol Gel ◽  
Mesoporous Alumina ◽  
Lewis Acidity ◽  
Methyl Tert Butyl Ether ◽  
Butyl Ether ◽  
Gel Method ◽  
Sol Gel Method ◽  
Tert Butyl ◽  
Brönsted Acidity

Mesoporous alumina which contains only Lewis acidity was synthesized by sol-gel method and was then impregnated with sulfuric acid to generate Brönsted acidity. The catalyst was used in Friedel-Crafts alkylation of resorcinol with methyl tert-butyl ether to produce 4-tert-butylresorcinol and 4,6-di-tert-butylresor- cinol as the major and minor products respectively. It was demonstrated that Lewis and Brönsted acidities play a synergetic role in this reaction.

Effect of acidity and structure on the anhydrous proton conduction of acid-doped inorganic–organic hybrid membranes

2010 ◽  
Vol 348 (1-2) ◽  
pp. 190-196 ◽  
Author(s):  
Eun Kyeong Kim ◽  
Seunghwan Son ◽  
Jongok Won ◽  
Chan Kyung Kim ◽  
Yong Soo Kang
Keyword(s):  
Proton Conduction ◽  
Hybrid Membranes ◽  
Organic Hybrid ◽  
Anhydrous Proton Conduction
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