A new organo-directed titanium phosphate, [NH3CH2CH2NH3]·[TiO(HPO4)2], was synthesized by the solvothermal method and its structure was determined by single crystal X-ray diffraction. The structure consists of 1-...A new organo-directed titanium phosphate, [NH3CH2CH2NH3]·[TiO(HPO4)2], was synthesized by the solvothermal method and its structure was determined by single crystal X-ray diffraction. The structure consists of 1-D zigzag chains built up from trans-corner-sharing titanium oxo octahedra running along the b axis, with fused Ti2P three-membered rings being attached to the ( Ti ( O ( Ti ( O ( backbone.展开更多
Low-valent titanium reagent prepared in situ from TiCl_4 and Zn was employed to induce the intramolecular coupling of nitro group with carbonyl group to give substituted hydroxyl pyrrolines, pyrroles and lactam in goo...Low-valent titanium reagent prepared in situ from TiCl_4 and Zn was employed to induce the intramolecular coupling of nitro group with carbonyl group to give substituted hydroxyl pyrrolines, pyrroles and lactam in good yields.展开更多
The TiN coatings on the surfaces of various cemented carbides were performed by use of reactive magnetron sputtering. The highest microhardness which was obtained in our experiment was 49 GPa. The order of effects of ...The TiN coatings on the surfaces of various cemented carbides were performed by use of reactive magnetron sputtering. The highest microhardness which was obtained in our experiment was 49 GPa. The order of effects of deposition parameters is resulted from the L16 experiments according to orthogonal design. The pole density analysis indicated that there were a few of the textureless samples. The crystal orientation of TiN exhibited clear regularity and affected microhardness and other properties of films remarkably. A concept relating to structure factor was proposed. A layer-like structure was found. SAES showed that a transition layer exists between substrate and coating and its thickness is of a micron. The formation mechanism of film was discussed.展开更多
Spinel compounds LiNi0.5Mn1.3Ti0.2O4（LNMTO） and Li4Ti5O12 （LTO） were synthesized by different methods. The particle sizes of LNMTO and LTO are 0.5-2 and 0.5-0.8 μm, respectively. The LNMTO/LTO cell exhibits bette...Spinel compounds LiNi0.5Mn1.3Ti0.2O4（LNMTO） and Li4Ti5O12 （LTO） were synthesized by different methods. The particle sizes of LNMTO and LTO are 0.5-2 and 0.5-0.8 μm, respectively. The LNMTO/LTO cell exhibits better electrochemical properties at both a low current rate of 0.2C and a high current rate of 1C. When the specific capacity was determined based on the mass of the LNMTO cathode, the LNMTO/LTO cell delivered 137 mA.h.g-1 at 0.2C and 118.2 mA-h-g-l at 1C, and the corresponding capacity retentions after 30 cycles are 88.5% and 92.4%, respectively.展开更多
The microstructures of Cr modified Al3Ti containing Al2Ti and L10-AlTi precipitates have been investigated in terms of transmission electron microscopy(TEM). Fine precipitation of Al2Ti (Ga2Hf type structure) and Ll0-...The microstructures of Cr modified Al3Ti containing Al2Ti and L10-AlTi precipitates have been investigated in terms of transmission electron microscopy(TEM). Fine precipitation of Al2Ti (Ga2Hf type structure) and Ll0-AlTi(Cr) occurs in Ll2-Al3Ti(Cr) by aging around 973K. The aging behavior was investigated by microhardness measurements. TEM observations reveal that plate-like Al2Ti precipitates lie on{100} planes of the Ll2-Al3Ti(Cr) matrix with the c axis of the tetragonal phase perpendicular to the thin plate. As contrast with Al2Ti precipitates, Ll0-AlTi(Cr) precipitates form thin plate and lie on {100} planes of Ll2-Al3Ti(Cr) matrix at the initial aging time and for long time aging the habit plane of the thin plate deviates from {100} plane and finally forms a kinked plate. The coherency stresses across the precipitate/matrix interface are considered to be the main factors controlling the precipitate morphology.展开更多
Mg （MgH2）-based composites, using carbon nanotubes （CNTs） and pre-synthesized titanium based complex （TCat） as the cat- alysts, were prepared by high energy ball milling technique. The use of both catalysts demo...Mg （MgH2）-based composites, using carbon nanotubes （CNTs） and pre-synthesized titanium based complex （TCat） as the cat- alysts, were prepared by high energy ball milling technique. The use of both catalysts demonstrated markedly improved the hydrogen storage performance, e.g. a significant increase of hydrogen release rate and decrease of desorption temperature. The synthesized composites can absorb almost 6 wt% of hydrogen within 3 min at 200 ~C and desorb 6 wt% hydrogen in 10 min at 310 ~C. The influence of CNTs and TCat on desorption temperature was also investigated by using temperature programmed desorption （TPD）. The TPD results reveal that the peak desorption temperature and the onset temperature can be lowered by 109 ~C and 155 ~C, respectively, compared to the non-catalyzed MgH2. The reaction enthalpy and entropy of hydrogen de- sorption for the synthesized MgH2-based composites are calculated by the van＇t Hoff analysis to be 73.1 kJ/mol H2 and 130.2 J/mol H2 K, respectively.展开更多
A 128× 128 elements cylindrical liquid crystal （LC） lens array with electrically controllable focal length is proposed. The cylindrical LC lens array uses transparent indium tin oxide （ITO） films as electrode...A 128× 128 elements cylindrical liquid crystal （LC） lens array with electrically controllable focal length is proposed. The cylindrical LC lens array uses transparent indium tin oxide （ITO） films as electrode, avoiding to affect the optical path operating in the voltage-off status. As the top electrode of the cylindrical LC lens array contacts with LC, the operation voltage root-mean-square （RMS） amplitude can be as low as 1.4 V and the response time is about 20-30 ms. The special optical focusing feature of the cylindrical LC lens array is got. And the focal length of this array is about 60-450 μm.展开更多
文摘A new organo-directed titanium phosphate, [NH3CH2CH2NH3]·[TiO(HPO4)2], was synthesized by the solvothermal method and its structure was determined by single crystal X-ray diffraction. The structure consists of 1-D zigzag chains built up from trans-corner-sharing titanium oxo octahedra running along the b axis, with fused Ti2P three-membered rings being attached to the ( Ti ( O ( Ti ( O ( backbone.
文摘Low-valent titanium reagent prepared in situ from TiCl_4 and Zn was employed to induce the intramolecular coupling of nitro group with carbonyl group to give substituted hydroxyl pyrrolines, pyrroles and lactam in good yields.
文摘The TiN coatings on the surfaces of various cemented carbides were performed by use of reactive magnetron sputtering. The highest microhardness which was obtained in our experiment was 49 GPa. The order of effects of deposition parameters is resulted from the L16 experiments according to orthogonal design. The pole density analysis indicated that there were a few of the textureless samples. The crystal orientation of TiN exhibited clear regularity and affected microhardness and other properties of films remarkably. A concept relating to structure factor was proposed. A layer-like structure was found. SAES showed that a transition layer exists between substrate and coating and its thickness is of a micron. The formation mechanism of film was discussed.
基金supported by the National Natural Science Foundation of China (No.51074038)the Training Program on National College Students’ Innovation Experiment (No.110126)
文摘Spinel compounds LiNi0.5Mn1.3Ti0.2O4（LNMTO） and Li4Ti5O12 （LTO） were synthesized by different methods. The particle sizes of LNMTO and LTO are 0.5-2 and 0.5-0.8 μm, respectively. The LNMTO/LTO cell exhibits better electrochemical properties at both a low current rate of 0.2C and a high current rate of 1C. When the specific capacity was determined based on the mass of the LNMTO cathode, the LNMTO/LTO cell delivered 137 mA.h.g-1 at 0.2C and 118.2 mA-h-g-l at 1C, and the corresponding capacity retentions after 30 cycles are 88.5% and 92.4%, respectively.
基金the Gmnt-in-Aid for Scientific Research from the Ministry of Education, Science and Culture Of Japan and the National NaturalSci
文摘The microstructures of Cr modified Al3Ti containing Al2Ti and L10-AlTi precipitates have been investigated in terms of transmission electron microscopy(TEM). Fine precipitation of Al2Ti (Ga2Hf type structure) and Ll0-AlTi(Cr) occurs in Ll2-Al3Ti(Cr) by aging around 973K. The aging behavior was investigated by microhardness measurements. TEM observations reveal that plate-like Al2Ti precipitates lie on{100} planes of the Ll2-Al3Ti(Cr) matrix with the c axis of the tetragonal phase perpendicular to the thin plate. As contrast with Al2Ti precipitates, Ll0-AlTi(Cr) precipitates form thin plate and lie on {100} planes of Ll2-Al3Ti(Cr) matrix at the initial aging time and for long time aging the habit plane of the thin plate deviates from {100} plane and finally forms a kinked plate. The coherency stresses across the precipitate/matrix interface are considered to be the main factors controlling the precipitate morphology.
基金supported by the Australian Research Council(ARC)
文摘Mg （MgH2）-based composites, using carbon nanotubes （CNTs） and pre-synthesized titanium based complex （TCat） as the cat- alysts, were prepared by high energy ball milling technique. The use of both catalysts demonstrated markedly improved the hydrogen storage performance, e.g. a significant increase of hydrogen release rate and decrease of desorption temperature. The synthesized composites can absorb almost 6 wt% of hydrogen within 3 min at 200 ~C and desorb 6 wt% hydrogen in 10 min at 310 ~C. The influence of CNTs and TCat on desorption temperature was also investigated by using temperature programmed desorption （TPD）. The TPD results reveal that the peak desorption temperature and the onset temperature can be lowered by 109 ~C and 155 ~C, respectively, compared to the non-catalyzed MgH2. The reaction enthalpy and entropy of hydrogen de- sorption for the synthesized MgH2-based composites are calculated by the van＇t Hoff analysis to be 73.1 kJ/mol H2 and 130.2 J/mol H2 K, respectively.
基金supported by the National Natural Science Foundation of China under Grant Nos.60777003supported by the National Natural Science Foundation of China under Grant Nos.60736010
文摘A 128× 128 elements cylindrical liquid crystal （LC） lens array with electrically controllable focal length is proposed. The cylindrical LC lens array uses transparent indium tin oxide （ITO） films as electrode, avoiding to affect the optical path operating in the voltage-off status. As the top electrode of the cylindrical LC lens array contacts with LC, the operation voltage root-mean-square （RMS） amplitude can be as low as 1.4 V and the response time is about 20-30 ms. The special optical focusing feature of the cylindrical LC lens array is got. And the focal length of this array is about 60-450 μm.
