An ordered array of Ni submicrotubes with up to 35 ìm in length has been successfully prepared by electrodeposition in the pores of alumina membrane modified with methyl-?-diethylenetriaminopropyl-dimethoxysilane...An ordered array of Ni submicrotubes with up to 35 ìm in length has been successfully prepared by electrodeposition in the pores of alumina membrane modified with methyl-?-diethylenetriaminopropyl-dimethoxysilane as pore-wall-modifying agent. Furthermore, using the array of Ni submicrotubes with an alumina membrane support as a "second-order-template", the concentric composite structure of Co wires filling Ni submicrotubes was prepared by electrodeposition method. Magnetization measurements on the array of the Ni submicrotubes and the concentric composite structure of Co wires filling Ni submicrotubes revealed different uniaxial magnetic anisotropy.展开更多
Poly(styrene-acrylonitrile) emulsion particles with positive charges on the surface were synthesized by emulsion polymerization using cationic surfactant octotyltrimethyl ammonium chloride (OTAC) as emulsifier.The sus...Poly(styrene-acrylonitrile) emulsion particles with positive charges on the surface were synthesized by emulsion polymerization using cationic surfactant octotyltrimethyl ammonium chloride (OTAC) as emulsifier.The suspension of montmorillonite was slowly dropped into the emulsion.Through the interaction between the negative charges on the montmorillonite layers and the cations on the surface of poly(styrene-acrylonitrile) particles, the montmorillonite layers and emulsion particles could assemble and absorb on each other by themselves.The change of δ voltage and particle size of the emulsion during the process of dropping was characterized, which demonstrated that the emulsion particles and montmorillonite layers absorbed on each other by the electrovalent bond and an intersectional structure was formed in the complex emulsion.Poly(styrene-acrylonitrile)/ montmorillonite nanocomposite was obtained after coagulation.The structure of nanocomposite was characterized with XRD and TEM.The results indicated that montmorillonite was exfoliated into layers with a thickness of several nanometers and uniformly dispersed in the polymer matrix.展开更多
A series of nanometer oxide catalytic materials AMyAl12-yO19-δwere prepared by roasting solid oxides from the decomposition of nitrates.Its crystal structure and properties were characterized by XRD,BET,TEM technique...A series of nanometer oxide catalytic materials AMyAl12-yO19-δwere prepared by roasting solid oxides from the decomposition of nitrates.Its crystal structure and properties were characterized by XRD,BET,TEM techniques,and the catalytic activities for CO2 reforming of methane to synthetic gas was also investigated.Experimental results showed that AMyAl12-yO19-δ exhibited similar crystal structures and different properties due to the difference of the substituted metals A and M.Under the same reaction condition,compound oxides AMyAl12-yO19-δexhibited significant catalytic activities and stability for CO2 reforming of methane.During 18h reaction at 700℃,the conversions of CH4 and CO2 remained over 93.4%and 91.2%,respectively and the amount of carbon deposited was only 1.57%.展开更多
文摘An ordered array of Ni submicrotubes with up to 35 ìm in length has been successfully prepared by electrodeposition in the pores of alumina membrane modified with methyl-?-diethylenetriaminopropyl-dimethoxysilane as pore-wall-modifying agent. Furthermore, using the array of Ni submicrotubes with an alumina membrane support as a "second-order-template", the concentric composite structure of Co wires filling Ni submicrotubes was prepared by electrodeposition method. Magnetization measurements on the array of the Ni submicrotubes and the concentric composite structure of Co wires filling Ni submicrotubes revealed different uniaxial magnetic anisotropy.
文摘Poly(styrene-acrylonitrile) emulsion particles with positive charges on the surface were synthesized by emulsion polymerization using cationic surfactant octotyltrimethyl ammonium chloride (OTAC) as emulsifier.The suspension of montmorillonite was slowly dropped into the emulsion.Through the interaction between the negative charges on the montmorillonite layers and the cations on the surface of poly(styrene-acrylonitrile) particles, the montmorillonite layers and emulsion particles could assemble and absorb on each other by themselves.The change of δ voltage and particle size of the emulsion during the process of dropping was characterized, which demonstrated that the emulsion particles and montmorillonite layers absorbed on each other by the electrovalent bond and an intersectional structure was formed in the complex emulsion.Poly(styrene-acrylonitrile)/ montmorillonite nanocomposite was obtained after coagulation.The structure of nanocomposite was characterized with XRD and TEM.The results indicated that montmorillonite was exfoliated into layers with a thickness of several nanometers and uniformly dispersed in the polymer matrix.
文摘A series of nanometer oxide catalytic materials AMyAl12-yO19-δwere prepared by roasting solid oxides from the decomposition of nitrates.Its crystal structure and properties were characterized by XRD,BET,TEM techniques,and the catalytic activities for CO2 reforming of methane to synthetic gas was also investigated.Experimental results showed that AMyAl12-yO19-δ exhibited similar crystal structures and different properties due to the difference of the substituted metals A and M.Under the same reaction condition,compound oxides AMyAl12-yO19-δexhibited significant catalytic activities and stability for CO2 reforming of methane.During 18h reaction at 700℃,the conversions of CH4 and CO2 remained over 93.4%and 91.2%,respectively and the amount of carbon deposited was only 1.57%.
