Anatase Ti0_(2) nanosheet-based hierarchical spheres(HSs)with nearly 100%exposed{001}facets were synthesized via a facile solvothermal process.Using these hierarchical spheres as a scattering layer on nanocrystaline T...Anatase Ti0_(2) nanosheet-based hierarchical spheres(HSs)with nearly 100%exposed{001}facets were synthesized via a facile solvothermal process.Using these hierarchical spheres as a scattering layer on nanocrystaline TiO_(2)film,hi-layered dye-sensitized solar cells(DSSCs)have been fabricated by electrophoresis deposition method,which well preserved the fragile hierarchical structure.Owing to the superior dye adsorption and light scattering effect of HSs,an overall energy conversion efficiency of 7.38%is achieved,which is 26%higher than that of nanoparticle-based photoanode.展开更多
As a popular anode material for lithium-ion batteries,anatase TiO2 nanoparticles with exposed{001}facets usually exhibit exceptional lithium storage performance owing to more accessible sites and fast migration of lit...As a popular anode material for lithium-ion batteries,anatase TiO2 nanoparticles with exposed{001}facets usually exhibit exceptional lithium storage performance owing to more accessible sites and fast migration of lithium ions along the good crystalline channels.However,there are few researches on the lithium storage capability of TiO2 nanocrystals with other high-energy facets owing to lack of effective synthesis method for controlling crystal facets.Herein,anatase TiO2 nanocrystals with exposed{010}-and[111]-facets are successfully prepared by using the delaminated tetratitanate nanoribbons as precursors.The electrochemical properties of these TiO2 nanocrystals with high-energy surfaces and the comparison with commercial TiO2 nanoparticles(P25)are studied.It is found that the cycle and rate performance of TiO2 nanocrystals is highly improved by reducing the particle size of nanocrystals.Moreover,TiO2 nanocrystals with exposed{010}-and[111]-facets exhibit better lithium storage capacities in comparison with P25 without a specific facet though P25 has smaller particle size than these TiO2 nanocrystals,indicating that the exposed facets of TiO2 nanocrystals have an important impact on their lithium storage capacity.Therefore,the synthesis design of high-performance TiO2 materials applied in the next-generation secondary batteries should both consider the particle size and the exposed facets of nanocrystals.展开更多
The development of nitroglycerine tolerance limits its clinical efficacy of nitric oxide(NO)donors. Several cellular mechanisms have been proposed to explain this phenomenon,one of which is an exaggerated production o...The development of nitroglycerine tolerance limits its clinical efficacy of nitric oxide(NO)donors. Several cellular mechanisms have been proposed to explain this phenomenon,one of which is an exaggerated production of reactive oxygen specious(ROS).The present study examined whether ROS contribute to the occurrence of nitroglycerine tolerance which is induced展开更多
To investigate the effects of aluminurn （Al） exposure on renal structure of rats, 60 Wistar rats were randomly divided into four treatment groups and were orally exposed to 0 （control group, GC）, 64.18 （low-dose ...To investigate the effects of aluminurn （Al） exposure on renal structure of rats, 60 Wistar rats were randomly divided into four treatment groups and were orally exposed to 0 （control group, GC）, 64.18 （low-dose group, GL）, 128.36 （middle-dose group, GM）, and 256.72 （high-dose group, GH） mg· kg^-1 BW AlCl3 in drinking water for 120 days. The body weight of different rats was recorded, the kidney pathologic structure and the ultrastructure were observed. The results showed that the body weight of different rats was markedly lower in Al-treated rats than those in GC （P〈0.05; P〈0.01）. After masson staining, the collagen was deposited in the renal interstitium and aggravated with Al dose increases in Al-treated rats. Under electron microscope, the infolding of the plasma membrane was slight swollen, the mitochondrion was abundant with different sizes, the mitochondrion cristae was fused, the microvillus was swollen and fused in GH. Our findings indicated that sub-chronic A1 exposure slowed the weight of rats and caused the kidney pathologic damage in rats.展开更多
High efficiency, environmental protection and sustainability have become the main theme of the development of the protection engineering, requiring that the components not only meet the basic functions, but also have ...High efficiency, environmental protection and sustainability have become the main theme of the development of the protection engineering, requiring that the components not only meet the basic functions, but also have chemical properties such as acid and alkali corrosion resistance and aging resistance. Polyisocyanate-oxazodone(POZD) polymer has the above characteristics, it also has the advantages of strong toughness, high strength and high elongation. The concrete slab sprayed with POZD material has excellent anti-blast performance. In order to explore the damage characteristics of POZD sprayed concrete slabs under the action of contact explosion thoroughly, the contact explosion test of POZD concrete slabs with different charges were carried out. On the basis of experimental verification,numerical simulation were used to study the influence of the thickness of the POZD on the blast resistance of the concrete slab. According to the test and numerical simulation results that as the thickness of the coating increases, the anti-blast performance of the concrete slab gradually increases,and the TNT equivalent required for critical failure is larger. Based on the above analysis, empirical expressions on normalized crater diameter, the normalized spall diameter and normalized spall diameter are obtained.展开更多
XPS has been applied to study the interactions of formic and acetic acids with preoxidised iron surfaces. Exposure of the surface to acetic acid at 300 K would result in two Cls peaks of similar intensities at 285.2 e...XPS has been applied to study the interactions of formic and acetic acids with preoxidised iron surfaces. Exposure of the surface to acetic acid at 300 K would result in two Cls peaks of similar intensities at 285.2 eV and 289.0 eV B.E. （Binding Energy）. An Ols component with FWHM about 2.2 eV was also observed at 532.0 eV B.E. It was suggested that CH<sub>3</sub>COOH adsorbed as CH<sub>3</sub>COO（a） and OH（a） on the surface according to surface acid-base interaction: CH<sub>3</sub>COOH（g）+O<sup>2-</sup>（a）（?） CH<sub>3</sub>COO（a）+OH（a） （1） The above mechanism was strongly supported stoichiometrically, using the Roberts—Carley equation for surface concentration calculations. When a preoxidised iron surface was exposed to formic acid at 300 K, two Cls peaks at 285.6 eV and 289.1 eV B.E. were clearly observed. The Cls peak at 289.1 eV B.E. was attributed to HCOO（a）. Its formation mechanism also belongs to the kind of surface acid-base interaction: HCOOH（g）+O<sup>2-</sup>（a）（?）HCOO（a）+OH（a） （2） The other Cls peak at 285.6 eV was proposed to be CH<sub>x</sub>O（a）. It展开更多
文摘Anatase Ti0_(2) nanosheet-based hierarchical spheres(HSs)with nearly 100%exposed{001}facets were synthesized via a facile solvothermal process.Using these hierarchical spheres as a scattering layer on nanocrystaline TiO_(2)film,hi-layered dye-sensitized solar cells(DSSCs)have been fabricated by electrophoresis deposition method,which well preserved the fragile hierarchical structure.Owing to the superior dye adsorption and light scattering effect of HSs,an overall energy conversion efficiency of 7.38%is achieved,which is 26%higher than that of nanoparticle-based photoanode.
基金Projects(21573023,51572031)supported by the National Natural Science Foundation of ChinaProject supported by the Grants-in-Acid for Doctor Research Funds+1 种基金Project supported by “1331 Project” for Innovation Team Construction Plan Funds of Jinzhong University,ChinaProject supported by “1331 Project” for 2018 Key Innovation Team Construction Plan Funds of Shanxi Province,China
文摘As a popular anode material for lithium-ion batteries,anatase TiO2 nanoparticles with exposed{001}facets usually exhibit exceptional lithium storage performance owing to more accessible sites and fast migration of lithium ions along the good crystalline channels.However,there are few researches on the lithium storage capability of TiO2 nanocrystals with other high-energy facets owing to lack of effective synthesis method for controlling crystal facets.Herein,anatase TiO2 nanocrystals with exposed{010}-and[111]-facets are successfully prepared by using the delaminated tetratitanate nanoribbons as precursors.The electrochemical properties of these TiO2 nanocrystals with high-energy surfaces and the comparison with commercial TiO2 nanoparticles(P25)are studied.It is found that the cycle and rate performance of TiO2 nanocrystals is highly improved by reducing the particle size of nanocrystals.Moreover,TiO2 nanocrystals with exposed{010}-and[111]-facets exhibit better lithium storage capacities in comparison with P25 without a specific facet though P25 has smaller particle size than these TiO2 nanocrystals,indicating that the exposed facets of TiO2 nanocrystals have an important impact on their lithium storage capacity.Therefore,the synthesis design of high-performance TiO2 materials applied in the next-generation secondary batteries should both consider the particle size and the exposed facets of nanocrystals.
文摘The development of nitroglycerine tolerance limits its clinical efficacy of nitric oxide(NO)donors. Several cellular mechanisms have been proposed to explain this phenomenon,one of which is an exaggerated production of reactive oxygen specious(ROS).The present study examined whether ROS contribute to the occurrence of nitroglycerine tolerance which is induced
基金Supported by the Science and Technology Program of Heilongjiang Educational Bureau(12541025)the Natural Science Foundation of Heilongjiang Province(C201425)
文摘To investigate the effects of aluminurn （Al） exposure on renal structure of rats, 60 Wistar rats were randomly divided into four treatment groups and were orally exposed to 0 （control group, GC）, 64.18 （low-dose group, GL）, 128.36 （middle-dose group, GM）, and 256.72 （high-dose group, GH） mg· kg^-1 BW AlCl3 in drinking water for 120 days. The body weight of different rats was recorded, the kidney pathologic structure and the ultrastructure were observed. The results showed that the body weight of different rats was markedly lower in Al-treated rats than those in GC （P〈0.05; P〈0.01）. After masson staining, the collagen was deposited in the renal interstitium and aggravated with Al dose increases in Al-treated rats. Under electron microscope, the infolding of the plasma membrane was slight swollen, the mitochondrion was abundant with different sizes, the mitochondrion cristae was fused, the microvillus was swollen and fused in GH. Our findings indicated that sub-chronic A1 exposure slowed the weight of rats and caused the kidney pathologic damage in rats.
基金the financial support from National Natural Science Foundation of China (Grant Nos. 11302261 and 11972201)supported by the project of Key Laboratory of Impact and Safety Engineering (Ningbo University),Ministry of Education. The project number is CJ202011。
文摘High efficiency, environmental protection and sustainability have become the main theme of the development of the protection engineering, requiring that the components not only meet the basic functions, but also have chemical properties such as acid and alkali corrosion resistance and aging resistance. Polyisocyanate-oxazodone(POZD) polymer has the above characteristics, it also has the advantages of strong toughness, high strength and high elongation. The concrete slab sprayed with POZD material has excellent anti-blast performance. In order to explore the damage characteristics of POZD sprayed concrete slabs under the action of contact explosion thoroughly, the contact explosion test of POZD concrete slabs with different charges were carried out. On the basis of experimental verification,numerical simulation were used to study the influence of the thickness of the POZD on the blast resistance of the concrete slab. According to the test and numerical simulation results that as the thickness of the coating increases, the anti-blast performance of the concrete slab gradually increases,and the TNT equivalent required for critical failure is larger. Based on the above analysis, empirical expressions on normalized crater diameter, the normalized spall diameter and normalized spall diameter are obtained.
基金This work was financially supported by Academia Sinica,(Young Scientists Research Award,1986).
文摘XPS has been applied to study the interactions of formic and acetic acids with preoxidised iron surfaces. Exposure of the surface to acetic acid at 300 K would result in two Cls peaks of similar intensities at 285.2 eV and 289.0 eV B.E. （Binding Energy）. An Ols component with FWHM about 2.2 eV was also observed at 532.0 eV B.E. It was suggested that CH<sub>3</sub>COOH adsorbed as CH<sub>3</sub>COO（a） and OH（a） on the surface according to surface acid-base interaction: CH<sub>3</sub>COOH（g）+O<sup>2-</sup>（a）（?） CH<sub>3</sub>COO（a）+OH（a） （1） The above mechanism was strongly supported stoichiometrically, using the Roberts—Carley equation for surface concentration calculations. When a preoxidised iron surface was exposed to formic acid at 300 K, two Cls peaks at 285.6 eV and 289.1 eV B.E. were clearly observed. The Cls peak at 289.1 eV B.E. was attributed to HCOO（a）. Its formation mechanism also belongs to the kind of surface acid-base interaction: HCOOH（g）+O<sup>2-</sup>（a）（?）HCOO（a）+OH（a） （2） The other Cls peak at 285.6 eV was proposed to be CH<sub>x</sub>O（a）. It
