CaSO4 Nanorods/wires were synthesized in quaternary W/O microemulsion soluti on containing triton X-100, cyclohexane and n-pentanol. Transmission electro n microscopy (TEM) was utilized to characterize the shape and s...CaSO4 Nanorods/wires were synthesized in quaternary W/O microemulsion soluti on containing triton X-100, cyclohexane and n-pentanol. Transmission electro n microscopy (TEM) was utilized to characterize the shape and size of products a s-prepared, as well as electron diffraction (ED) pattern was obtained for desi gnated nanorods (wires). It is revealed that ù0 (molar ratio of water to surfa ctant),reactants concentration and aging time play an important role in the form ation of different morphologies and size of synthesized CaSO4 nanocrystal.展开更多
The stabilizing conditions of W/O microemulsion of Tx 6～C 4H 9OH/c C 6H 12 /H 2O system were studied by visual observation and electrical conductance.The result shows that when the weight ratio of Tx 6 and C 4H 9OH i...The stabilizing conditions of W/O microemulsion of Tx 6～C 4H 9OH/c C 6H 12 /H 2O system were studied by visual observation and electrical conductance.The result shows that when the weight ratio of Tx 6 and C 4H 9OH is 4∶1,the W/O microemulsion sytem has stabilizing and extensive regions,and the system is insensitive to the values of pH at room temperature.In accordance with the theoretical value of HLB,the suitable value of HLB for Tx 6 and C 4H 9OH to compose microemulsion is greater than 9,less than or equal to 10.展开更多
BaTiO3 nanorods were synthesized in water/OP-10/n-hexanol/cyclohexane quaternary reverse microemulsion solution at 60 ℃. The effects of the molar ratio of water to surfactant and the concentration of reactants on the...BaTiO3 nanorods were synthesized in water/OP-10/n-hexanol/cyclohexane quaternary reverse microemulsion solution at 60 ℃. The effects of the molar ratio of water to surfactant and the concentration of reactants on the diameters and lengths of BaTiO 3 nanorods were studied. The products were characterized by TEM, XRD and ICP. The results show that the diameters and lengths of the prepared BaTiO 3 nanorods with a cubic phase and a single crystal are approximately 15\80 nm and 300\3 900 nm, respectively. And the molar ratio of barium to titanium of products is 1.0.展开更多
A novel catalytic material, ultrafine silica embedded catalyst, was prepared through the hydrolysis of tetraethoxysilane (TEOS) in W/O microemulsion, which was composed of cyclohexane, polyoxyethylene (10) nonylphenyl...A novel catalytic material, ultrafine silica embedded catalyst, was prepared through the hydrolysis of tetraethoxysilane (TEOS) in W/O microemulsion, which was composed of cyclohexane, polyoxyethylene (10) nonylphenyl (NP-10), hexanol and aqua ammonia of PdCl 2 and Cu(OAc) 2.It was found that the active species was wholly or partly embedded in the spherical silica particles with diameters in the range of 40—120 nm.The catalytic behavior of the catalyst in oxidative carbonylation of phenol to diphenyl carbonate (DPC) was studied. Under the optimized conditions(80℃,3.9 MPa and 8 h), the yield of DPC was 35.4%. In comparison with the catalysts prepared by the impregnation and sol-gel method, the ultrafine embedded catalyst showed high activity and long service time.When the catalyst was used at 80 ℃,3.9 MPa and 4 h for 4 times, the yield of DPC was 25.2%, 16.5%, 14.5% and 13.4%, respectively.展开更多
Lead iodide nanorods with a length of 500—3200 nm and a diameter of 35—130 nm were synthesized in an inverse microemulsion system consisting of water,Triton X-100,cyclohexane and n-hexanol.The prepared products were...Lead iodide nanorods with a length of 500—3200 nm and a diameter of 35—130 nm were synthesized in an inverse microemulsion system consisting of water,Triton X-100,cyclohexane and n-hexanol.The prepared products were characterized via TEM and XRD.The results show that ω0(the molar ratio of water to surfactant),the concentration of reactants,reaction temperature and aging time all can affect the morphology and size of the lead iodide nanorods prepared.The as-prepared nanorods belong to hexagonal system.展开更多
文摘CaSO4 Nanorods/wires were synthesized in quaternary W/O microemulsion soluti on containing triton X-100, cyclohexane and n-pentanol. Transmission electro n microscopy (TEM) was utilized to characterize the shape and size of products a s-prepared, as well as electron diffraction (ED) pattern was obtained for desi gnated nanorods (wires). It is revealed that ù0 (molar ratio of water to surfa ctant),reactants concentration and aging time play an important role in the form ation of different morphologies and size of synthesized CaSO4 nanocrystal.
文摘The stabilizing conditions of W/O microemulsion of Tx 6～C 4H 9OH/c C 6H 12 /H 2O system were studied by visual observation and electrical conductance.The result shows that when the weight ratio of Tx 6 and C 4H 9OH is 4∶1,the W/O microemulsion sytem has stabilizing and extensive regions,and the system is insensitive to the values of pH at room temperature.In accordance with the theoretical value of HLB,the suitable value of HLB for Tx 6 and C 4H 9OH to compose microemulsion is greater than 9,less than or equal to 10.
文摘BaTiO3 nanorods were synthesized in water/OP-10/n-hexanol/cyclohexane quaternary reverse microemulsion solution at 60 ℃. The effects of the molar ratio of water to surfactant and the concentration of reactants on the diameters and lengths of BaTiO 3 nanorods were studied. The products were characterized by TEM, XRD and ICP. The results show that the diameters and lengths of the prepared BaTiO 3 nanorods with a cubic phase and a single crystal are approximately 15\80 nm and 300\3 900 nm, respectively. And the molar ratio of barium to titanium of products is 1.0.
基金国家自然科学基金项目 (No 2 0 1760 0 8)天津市自然科学基金项目 (No 0 0 3 80 12 11)共同资助~~
文摘A novel catalytic material, ultrafine silica embedded catalyst, was prepared through the hydrolysis of tetraethoxysilane (TEOS) in W/O microemulsion, which was composed of cyclohexane, polyoxyethylene (10) nonylphenyl (NP-10), hexanol and aqua ammonia of PdCl 2 and Cu(OAc) 2.It was found that the active species was wholly or partly embedded in the spherical silica particles with diameters in the range of 40—120 nm.The catalytic behavior of the catalyst in oxidative carbonylation of phenol to diphenyl carbonate (DPC) was studied. Under the optimized conditions(80℃,3.9 MPa and 8 h), the yield of DPC was 35.4%. In comparison with the catalysts prepared by the impregnation and sol-gel method, the ultrafine embedded catalyst showed high activity and long service time.When the catalyst was used at 80 ℃,3.9 MPa and 4 h for 4 times, the yield of DPC was 25.2%, 16.5%, 14.5% and 13.4%, respectively.
文摘Lead iodide nanorods with a length of 500—3200 nm and a diameter of 35—130 nm were synthesized in an inverse microemulsion system consisting of water,Triton X-100,cyclohexane and n-hexanol.The prepared products were characterized via TEM and XRD.The results show that ω0(the molar ratio of water to surfactant),the concentration of reactants,reaction temperature and aging time all can affect the morphology and size of the lead iodide nanorods prepared.The as-prepared nanorods belong to hexagonal system.
