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Yun Hau Ng Izan Izwan Hadi Nur Mohd Nazlan Mohd Muhid Halimaton Hamdan 《Journal of fluorine chemistry》2007,128(1):12-16
A series of amphiphilic fluorinated zirconia containing titanium was prepared by titanium impregnation followed by fluorination and alkylsilylation of zirconium oxide. Physical properties of the resulting samples were characterized by XRD analysis, UV-vis spectroscopy, BET surface area analysis and EDAX analysis. The effects of fluorine and alkylsilane groups on the samples were studied by the epoxidation of 1-octene with aqueous hydrogen peroxide. The epoxidation of alkenes is one of the most important methods of functionalizing simple hydrocarbons. The amphiphilic fluorinated catalysts were more active and more efficient than the conventional titania-silica and zirconia-silica mixed oxides in linear alkene epoxidation; enhanced by the presence of alkylsilane and fluorine groups in the catalysts. Modification with alkylsilane successfully induces the hydrophobic behavior of zirconia which is hydrophilic in nature; whereas fluorine was chosen for its electron-withdrawing effect which further activates the titanium active sites. 相似文献
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Suriani Sani Mohd Nazlan Mohd Muhid Halimaton Hamdan 《Journal of Sol-Gel Science and Technology》2011,59(1):7-18
Tyrosinase encapsulated silica aerogel (TESA) was synthesized via an alcohol-free colloidal sol–gel route at room temperature
and at neutral pH. Characterization on TESA indicated that 98% of enzyme was effectively loaded and located inside the aerogel
network. TESA without solvent extraction showed higher tyrosinase activity than TESA extracted by amyl acetate/acetone (v/v:1/1).
Stability of tyrosinase in TESA was enhanced towards extreme temperature, acidic and basic conditions. Optimization study
indicates that 500 U enzyme/g silica aerogel; aged for 2 days, showed superior performance in the oxidation of catechol. The
activity of TESA was remarkably enhanced; which was active at a wider temperature (up to 80 °C) and pH range (4–9). In contrast,
free tyrosinase was totally inactive at these pH values and temperature >55 °C. TESA successfully removed about 90% of phenol
in aqueous solution after 3 h of contact time with excellent reusability. 相似文献
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Ibrahim Idza Riati Hashim Mansor Ismail Ismayadi Matori Khamirul Amin Azis Raba’ah Syahidah Nazlan Rodziah Abdullah Nor Hapishah Wan Ab Rahman Wan Norailiana Mohd Idris Fadzidah Mat Daud Norni Hidayawati 《Journal of Thermal Analysis and Calorimetry》2019,137(1):105-119
Journal of Thermal Analysis and Calorimetry - Strontium titanate is a promising candidate for applications in thermoelectric, thermal management applications, and modern electronic devices because... 相似文献
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