为实现特定形貌CuO纳米材料的温和可控合成,增强该材料作为电化学催化剂的催化活性,利用亚铜离子在碱性溶液中的氧化沉淀反应,制备了形貌均一稳定的CuO纳米片层。采用粉末X射线衍射、扫描电子显微镜、透射电子显微镜、X射线光电子能谱...为实现特定形貌CuO纳米材料的温和可控合成,增强该材料作为电化学催化剂的催化活性,利用亚铜离子在碱性溶液中的氧化沉淀反应,制备了形貌均一稳定的CuO纳米片层。采用粉末X射线衍射、扫描电子显微镜、透射电子显微镜、X射线光电子能谱与电化学催化反应等手段,研究了不同合成参数对产物的形貌、价态与电化学催化性能的影响。研究结果表明:当产物投料比为0.01 g CuCl/10 mL TBAOH时,产物的电化学催化性质最好;在200℃下煅烧后,催化性能得到进一步提高。利用具有特殊分子结构的四丁基氢氧化铵作为模板剂,能够实现CuO纳米片层的简单、快速、温和制备;同时,产物中低价态Cu离子的存在可提高催化剂的电化学催化活性。通过煅烧提高产物的结晶性,能够进一步增强材料的电化学催化活性。展开更多
Silica mesoporous material MCFs with 16.0 nm pore sizes was prepared by using non-ionic block copolymers and the swelling agents, and was used as the support for the immobilization of enzyme. Penicillin G acylase, an ...Silica mesoporous material MCFs with 16.0 nm pore sizes was prepared by using non-ionic block copolymers and the swelling agents, and was used as the support for the immobilization of enzyme. Penicillin G acylase, an enzyme, was assembled in the channel of MCFs by immersion method. The activity and stability of immobilized penicillin G acylase were studied. It was found that the activity and stability of the immobilized penicillin G acylase increased significantly compared to those of free enzyme. The optimum reaction temperature is 60 ℃. After incubation at 60 ℃ for 1 h, the activity of these immobilized penicillin G acylase remains 69%. These results showed that thermostability and durability on heating of the immobilized penicillin G acylase in MCFs was improved remarkably. The silica mesoporous material MCFs with 3-dimensional channel structure is a good support for the immobilization of enzyme.展开更多
A tri\|coordinated 8\|hydroxyquinolato\|\%p\%\|methylphenolato\|zinc complex was first synthesized, and its photoluminescent spectra(PL) and UV absorption spectra were investigated. Double layer organic lighting diode...A tri\|coordinated 8\|hydroxyquinolato\|\%p\%\|methylphenolato\|zinc complex was first synthesized, and its photoluminescent spectra(PL) and UV absorption spectra were investigated. Double layer organic lighting diodes(OLEDs), ITO/PVK∶ZnqP(80 nm)/Mg∶Ag was fabricated by using this complex as the luminescent layer. Green electroluminescence(EL) was observed, and this complex was found as a good electroluminescence emitting material.展开更多
Co(en) 3V 3O 6·H 2O has been synthesized by using hydrothermal method and characterized by IR, ICP, XPS and X ray diffraction analysis. The results of the X ray diffraction analysis show that structure of Co(en) ...Co(en) 3V 3O 6·H 2O has been synthesized by using hydrothermal method and characterized by IR, ICP, XPS and X ray diffraction analysis. The results of the X ray diffraction analysis show that structure of Co(en) 3(VO 3) 3·H 2O is orthorhombic with P2(1)2(1)2(1) , and the crystal data are a =0 819 2(7) nm, b =1.263 9(1) nm, c =1.804 8(2) nm, V =1.868 8(3) nm 3, Z=4, D c=1.973 g/cm 3, F (000)=1 124, R 1=0.040 7, wR 2=0.094 9, ( Δ/ρ ) max =706 e/nm 3 and ( Δ/ρ ) min =-452 e/nm 3. The results of XPS show that the Co 2+ was oxidized to Co 3+ (en) 3 at about pH=7.0 in the aqueous solution.展开更多
Three open\|framework zinc germanophosphates have been synthesized from ethylene glycol systems of Zn(Ac)\-2·2H\-2O\|H\-3PO\-4\|\%R\%\|GeO\-2\|Py\|EG, where \%R\% stands for an amine and EG for ethylene glycol. I...Three open\|framework zinc germanophosphates have been synthesized from ethylene glycol systems of Zn(Ac)\-2·2H\-2O\|H\-3PO\-4\|\%R\%\|GeO\-2\|Py\|EG, where \%R\% stands for an amine and EG for ethylene glycol. It was found that by selecting proper amines as structure\|directing templates during crystallization open\|framework zinc germanophosphates were synthesized. The structures of the zinc germanophosphates were characterized by X\|ray diffraction(XRD), scanning electron microscopy(SEM), inductively coupled plasma(ICP) analysis, infrared spectroscopy(IR).展开更多
文摘为实现特定形貌CuO纳米材料的温和可控合成,增强该材料作为电化学催化剂的催化活性,利用亚铜离子在碱性溶液中的氧化沉淀反应,制备了形貌均一稳定的CuO纳米片层。采用粉末X射线衍射、扫描电子显微镜、透射电子显微镜、X射线光电子能谱与电化学催化反应等手段,研究了不同合成参数对产物的形貌、价态与电化学催化性能的影响。研究结果表明:当产物投料比为0.01 g CuCl/10 mL TBAOH时,产物的电化学催化性质最好;在200℃下煅烧后,催化性能得到进一步提高。利用具有特殊分子结构的四丁基氢氧化铵作为模板剂,能够实现CuO纳米片层的简单、快速、温和制备;同时,产物中低价态Cu离子的存在可提高催化剂的电化学催化活性。通过煅烧提高产物的结晶性,能够进一步增强材料的电化学催化活性。
文摘Silica mesoporous material MCFs with 16.0 nm pore sizes was prepared by using non-ionic block copolymers and the swelling agents, and was used as the support for the immobilization of enzyme. Penicillin G acylase, an enzyme, was assembled in the channel of MCFs by immersion method. The activity and stability of immobilized penicillin G acylase were studied. It was found that the activity and stability of the immobilized penicillin G acylase increased significantly compared to those of free enzyme. The optimum reaction temperature is 60 ℃. After incubation at 60 ℃ for 1 h, the activity of these immobilized penicillin G acylase remains 69%. These results showed that thermostability and durability on heating of the immobilized penicillin G acylase in MCFs was improved remarkably. The silica mesoporous material MCFs with 3-dimensional channel structure is a good support for the immobilization of enzyme.
文摘A tri\|coordinated 8\|hydroxyquinolato\|\%p\%\|methylphenolato\|zinc complex was first synthesized, and its photoluminescent spectra(PL) and UV absorption spectra were investigated. Double layer organic lighting diodes(OLEDs), ITO/PVK∶ZnqP(80 nm)/Mg∶Ag was fabricated by using this complex as the luminescent layer. Green electroluminescence(EL) was observed, and this complex was found as a good electroluminescence emitting material.
文摘Co(en) 3V 3O 6·H 2O has been synthesized by using hydrothermal method and characterized by IR, ICP, XPS and X ray diffraction analysis. The results of the X ray diffraction analysis show that structure of Co(en) 3(VO 3) 3·H 2O is orthorhombic with P2(1)2(1)2(1) , and the crystal data are a =0 819 2(7) nm, b =1.263 9(1) nm, c =1.804 8(2) nm, V =1.868 8(3) nm 3, Z=4, D c=1.973 g/cm 3, F (000)=1 124, R 1=0.040 7, wR 2=0.094 9, ( Δ/ρ ) max =706 e/nm 3 and ( Δ/ρ ) min =-452 e/nm 3. The results of XPS show that the Co 2+ was oxidized to Co 3+ (en) 3 at about pH=7.0 in the aqueous solution.
文摘以MnO2,Ca(OH)2和La(OH)3为反应原料,在惰性气氛、低温(500℃)熔融KOH体系中合成了具有菱形钙钛矿结构Ca,K共掺杂的La0.64Ca0.25K0.11MnO3纳米材料,并对Mn的价态及磁学性能等进行了讨论.X射线光电子能谱(XPS)分析结果表明,La0.64Ca0.25K0.11MnO3纳米材料中的Mn具有三重混合价态,其零场冷却低温磁化率曲线表现出顺磁-铁磁转变,居里温度(Tc)为280 K.
文摘Three open\|framework zinc germanophosphates have been synthesized from ethylene glycol systems of Zn(Ac)\-2·2H\-2O\|H\-3PO\-4\|\%R\%\|GeO\-2\|Py\|EG, where \%R\% stands for an amine and EG for ethylene glycol. It was found that by selecting proper amines as structure\|directing templates during crystallization open\|framework zinc germanophosphates were synthesized. The structures of the zinc germanophosphates were characterized by X\|ray diffraction(XRD), scanning electron microscopy(SEM), inductively coupled plasma(ICP) analysis, infrared spectroscopy(IR).
