Thin PVA/nickel acetate composite fibers were prepared by using sol-gel processing and electrospinning technique. After the calcination of the above precursor fibers,NiO nanofibres with a diameter of 50—100 nm could ...Thin PVA/nickel acetate composite fibers were prepared by using sol-gel processing and electrospinning technique. After the calcination of the above precursor fibers,NiO nanofibres with a diameter of 50—100 nm could be successfully obtained. The fibers were characterized by TG-DTA, FT-IR,WAXD and SEM respectively. The results showed that the crystalline phase and morphology of NiO fibres were greatly influenced by the calcination temperature. [WT5HZ]展开更多
AlPO 4 5 molecular sieve with an orthorhombic phase was studied by in situ variable temperature infrared spectroscopy. The reversible phase transition from the orthorhombic into the hexagonal phase was found at about ...AlPO 4 5 molecular sieve with an orthorhombic phase was studied by in situ variable temperature infrared spectroscopy. The reversible phase transition from the orthorhombic into the hexagonal phase was found at about 120 ℃. [WT5HZ]展开更多
Thin PVA/zirconium oxychloride composite fibers were prepared by using sol-gel processing and electrospinning technique. After calcining the above precursor fibers,ZrO 2 nanofibers with a diameter of 70—100 nm were s...Thin PVA/zirconium oxychloride composite fibers were prepared by using sol-gel processing and electrospinning technique. After calcining the above precursor fibers,ZrO 2 nanofibers with a diameter of 70—100 nm were successfully obtained. The ZrO 2 nanofibers were characterized by XRD,TG-DTA,FTIR,and SEM,respectively. The results show that the crystallinity and morphology of ZrO 2 fibers are largely influenced by the calcination temperature.展开更多
Zeolite ZSM-5 has been synthesized with the organosilicon compound γ-aminopropyl triethoxylsilane as structure-directing agent using the composition 10SiO2: Al2O3: 3-5Na2O: 0. 1-0.5R: 40-100H2O(molar ratios). First o...Zeolite ZSM-5 has been synthesized with the organosilicon compound γ-aminopropyl triethoxylsilane as structure-directing agent using the composition 10SiO2: Al2O3: 3-5Na2O: 0. 1-0.5R: 40-100H2O(molar ratios). First of all, γ-aminopropyl triethoxylsilane was quaternarized with bromoethane and ethyl alcohol. XRD, TG, DTA and SEM were used to characterize the sample. The investigation proves that the organosilicon compound resides intact at the channel intersections, and that the silicon atom In this species is located in a framework position. Prehydrolysis of the organosilane precursor is necessary for zeolite formation.展开更多
利用热分散法将 Li Cl分散到 Na Y分子筛笼形孔道内制备了 Li Cl/ Na Y主客体湿敏材料 ,该材料保持了 Li Cl体相材料优良的湿敏特性 ,同时由于分子筛孔道的限域作用及 Li Cl盐与分子筛载体间的强离子键合作用 ,克服了 Li Cl体相材料的...利用热分散法将 Li Cl分散到 Na Y分子筛笼形孔道内制备了 Li Cl/ Na Y主客体湿敏材料 ,该材料保持了 Li Cl体相材料优良的湿敏特性 ,同时由于分子筛孔道的限域作用及 Li Cl盐与分子筛载体间的强离子键合作用 ,克服了 Li Cl体相材料的某些固有缺陷 .分子筛结构对这种主客体材料有很大影响 ,具有笼形三维孔道结构的分子筛如 Na Y更适于作主体材料 .二维孔道型的展开更多
文摘Thin PVA/nickel acetate composite fibers were prepared by using sol-gel processing and electrospinning technique. After the calcination of the above precursor fibers,NiO nanofibres with a diameter of 50—100 nm could be successfully obtained. The fibers were characterized by TG-DTA, FT-IR,WAXD and SEM respectively. The results showed that the crystalline phase and morphology of NiO fibres were greatly influenced by the calcination temperature. [WT5HZ]
文摘AlPO 4 5 molecular sieve with an orthorhombic phase was studied by in situ variable temperature infrared spectroscopy. The reversible phase transition from the orthorhombic into the hexagonal phase was found at about 120 ℃. [WT5HZ]
文摘Thin PVA/zirconium oxychloride composite fibers were prepared by using sol-gel processing and electrospinning technique. After calcining the above precursor fibers,ZrO 2 nanofibers with a diameter of 70—100 nm were successfully obtained. The ZrO 2 nanofibers were characterized by XRD,TG-DTA,FTIR,and SEM,respectively. The results show that the crystallinity and morphology of ZrO 2 fibers are largely influenced by the calcination temperature.
文摘Zeolite ZSM-5 has been synthesized with the organosilicon compound γ-aminopropyl triethoxylsilane as structure-directing agent using the composition 10SiO2: Al2O3: 3-5Na2O: 0. 1-0.5R: 40-100H2O(molar ratios). First of all, γ-aminopropyl triethoxylsilane was quaternarized with bromoethane and ethyl alcohol. XRD, TG, DTA and SEM were used to characterize the sample. The investigation proves that the organosilicon compound resides intact at the channel intersections, and that the silicon atom In this species is located in a framework position. Prehydrolysis of the organosilane precursor is necessary for zeolite formation.
文摘利用热分散法将 Li Cl分散到 Na Y分子筛笼形孔道内制备了 Li Cl/ Na Y主客体湿敏材料 ,该材料保持了 Li Cl体相材料优良的湿敏特性 ,同时由于分子筛孔道的限域作用及 Li Cl盐与分子筛载体间的强离子键合作用 ,克服了 Li Cl体相材料的某些固有缺陷 .分子筛结构对这种主客体材料有很大影响 ,具有笼形三维孔道结构的分子筛如 Na Y更适于作主体材料 .二维孔道型的
