It has been made certain that thio-and oxy-diacetic acid hydrazides are potential anticancer compounds.However,their ability to form complexes with transition metals and the properties of the complexes thus formed hav...It has been made certain that thio-and oxy-diacetic acid hydrazides are potential anticancer compounds.However,their ability to form complexes with transition metals and the properties of the complexes thus formed have not been studied.Employing a new potential anticancer ligand 1,2-bis(thioacetic acid hydrazide)ethane prepared in our lab,along with ligands oxydiacetic hydrazide and 1,2-bis(oxyacetic acid hydrazide) ethane,a series of 11 new first-row transition metal(M=Zn^(2+),Cu^(2+),Co^(2+), Ni^(2+))complexes with each of the above three ligands have been synthesized and characterized by means of elemental analyses,IR,TG and X-ray powder diffraction.展开更多
Size characterization of silver nanoparticles with biomolecule corona（AgNP@BCs） and mass quantification of various silver species in organisms are essential for understanding the in vivo transformation of Ag NPs. He...Size characterization of silver nanoparticles with biomolecule corona（AgNP@BCs） and mass quantification of various silver species in organisms are essential for understanding the in vivo transformation of Ag NPs. Herein, we report a versatile method that allows simultaneous determination of the size of AgNP@BCs and mass concentration of various silver species in rat liver. Both particulate and ionic silver were extracted in their original forms from the organs by alkaline digestion, and analyzed by size exclusion chromatography combined with inductively coupled plasma mass spectrometry（SEC-ICP-MS）. While the silver mass concentrations were quantified by ICP-MS with a detection limit of 0.1 μg/g, the effective diameter of AgNP@BCs was determined based on the retention time in SEC separation with size discrimination of 0.6-3.3 nm. More importantly, we found that the BC thickness of AgNP@BCs is core size independent, and a linear correlation was found between the effective diameter and core diameter of AgNP@BCs in extracted tissues, which was used to calibrate the core diameter with standard deviations in the range of 0.2-1.1 nm. The utility of this strategy was demonstrated through application to rat livers in vivo. Our method is powerful for investigating the transformation mechanism of Ag NPs in vivo.展开更多
Carbon dioxide （CO2） capture and geological storage （CCS） is one of promising technologies for greenhouse gas effect mitigation. Many geotechnical challenges remain during carbon dioxide storage field practices, a...Carbon dioxide （CO2） capture and geological storage （CCS） is one of promising technologies for greenhouse gas effect mitigation. Many geotechnical challenges remain during carbon dioxide storage field practices, among which effectively detecting CO2 from deep underground is one of engineering problems. This paper reviews monitoring techniques currently used during CO2 injection and storage. A method developed based on measuring seismic microtremors is of main interest. This method was first successfully used to characterize a site in this paper. To explore its feasibility in C02 storage monitoring, numerical simulations were conducted to investigate detectable changes in elastic wave signatures due to injection and geological storage of CO2. It is found that, although it is effective for shallow earth profile estimation, the surface wave velocity is not sensitive to the CO2 layer physical parameter variations,especially for a thin CO2 geological storage layer in a deep underground reservoir.展开更多
Metal oxide semiconductor-based chemiresistors have been facing challenges in achieving low-temperature hydrogen sensing at the ppb level.The oxygen vacancy is considered to play a vital role in gas sensing properties...Metal oxide semiconductor-based chemiresistors have been facing challenges in achieving low-temperature hydrogen sensing at the ppb level.The oxygen vacancy is considered to play a vital role in gas sensing properties.However,a nonstoichiometric metal oxide semiconductor with efficient and controllable oxygen vacancies is not easily accessible.Herein,a facile solution reduction method of NaBH_(4)was developed to modulate the oxygen vacancies of ZnO nanosheets.The systematic characterization studies confirm the successful introduction of oxygen vacancies in ZnO samples.The gas sensing investigations illustrate that the construction of controlled oxygen vacancies greatly enhances the hydrogen sensing properties of ZnO nanosheets,especially a significantly reduced operating temperature(150℃)with a higher response(~38.2 for 200 ppm),a calculated limit of detection(55 ppb)and a quick recovery speed(only 6 s).The increased molecule adsorption and narrower band gap generated by controlled oxygen vacancies contribute to their superior sensing properties.The oxygen vacancy engineering strategy of pure metal oxide semiconductor-based materials shows great potential for creating low-temperature high-response sensors.展开更多
A novel photocatalyst with protonated carbon nitride(p-C_(3)N_(4))loaded with IrO_(2)quantum dots(QDs)was fabricated via a facile hydrothermal method.Structure characterization studies(XRD,STEM,XPS,UV–vis spectra and...A novel photocatalyst with protonated carbon nitride(p-C_(3)N_(4))loaded with IrO_(2)quantum dots(QDs)was fabricated via a facile hydrothermal method.Structure characterization studies(XRD,STEM,XPS,UV–vis spectra and PL spectra)revealed that the IrO_(2)QDs with an average diameter of ca.展开更多
Achieving high performance electronic structure engineering in multi-component photocatalysts to effectively coordinate photoinduced carrier migration and surface reaction dynamics is still a key obstacle for solar-dr...Achieving high performance electronic structure engineering in multi-component photocatalysts to effectively coordinate photoinduced carrier migration and surface reaction dynamics is still a key obstacle for solar-driven hydrogen production.Herein,well-defined ZnIn_(2)S_(4) nanosheets modified with metallic 1T-phase WS_(2) and Ni_(2)P dual cocatalysts with superior photoactivity and stability were fabricated by twostep ultrasonic self-assembly processes.A series of photoelectrochemical characterization studies revealed that the metallic phase 1T-WS_(2) with excellent conductivity can effectively lower the charge transport resistance and enhance electron transfer efficiency,while Ni_(2)P with abundant active sites can efficiently promote the surface H_(2)-production reaction dynamics in this dual cocatalyst system.Moreover,the synergistic effects of the 1T-WS_(2) and Ni_(2)P dual cocatalysts can boost the oxidation efficiency of the sacrificial regents(lactic acid)by elevating the valence band levels of ZnIn_(2)S_(4),which in turn promotes the separation of photocarriers.As a result,the optimized tandem Ni_(2)P/1T-WS_(2)/ZnIn_(2)S_(4) ternary heterojunction with a cascade electron transfer pathway achieved a peak hydrogen generation rate of 17.01 mmol g^(-1) h^(-1),roughly 3.34,1.56 and 1.36 times greater than those of bare ZnIn_(2)S_(4),binary 1T-WS_(2)/ZnIn_(2)S_(4) and Ni_(2)P/ZnIn_(2)S_(4),respectively.This work not only provides mechanistic insights into how dual cocatalysts influence electronic structure engineering and charge transfer dynamics but also establishes a versatile framework for the design of multi-component heterojunctions for more efficient and sustainable solarto-fuel conversion.展开更多
This paper presents the preparations and characterization of vesicles of four new fluoro- carbon amphiphiles with 1,3-disubstituted glycerol structure in common and different headgroups (OH, 1; CO_2H, 2; quaternary am...This paper presents the preparations and characterization of vesicles of four new fluoro- carbon amphiphiles with 1,3-disubstituted glycerol structure in common and different headgroups (OH, 1; CO_2H, 2; quaternary ammonium salt, 3; and pyridinium salt, 4). These vesicles have higher transition temperature due to the stronger hydrophobic interaction between fluorocarbon chains. Addition of fluorocarbon additives with carboxylic acid or quaternary ammonium salt head group respectively shows different influences on phase behavior of vesicles of 2. These results are discussed based on the interaction within headgroup, hydrophobicity and specific mutahydrophobic interaction between fluoro- and hydrocarbon chains.展开更多
Lane-changing behaviour is one of the complex|driving behaviours.The lane-changing behaviour of drivers may exacerbate congestion,however driver behavioural characteristics are difficult to accurately acquire and quan...Lane-changing behaviour is one of the complex|driving behaviours.The lane-changing behaviour of drivers may exacerbate congestion,however driver behavioural characteristics are difficult to accurately acquire and quantify,and thus tend to be simplified or ignored in existing lane-changing models.In this paper,the Bik-means clustering algorithm is used to analyse the urban road congestion state discrimination method.Then,simulated driving tests were conducted for different traffic congestion conditions.Through the force feedback system and infrared camera,the data of driver lane-changing behaviours at different traffic congestion levels are obtained separately,and the definitions of the start and end points of a vehicle changing lanes are determined.Furthermore,statistical analysis and discussion of key feature parameters including driver lane-changing behaviour data and visual data under different levels of traffic congestion were conducted.It is found that the average lane-change intention times in each congestion state are 2 s,4 s,6 s and 7 s,while the turn-signal duration and the number of rear-view mirror observations have similar patterns of change to the data on lane-changing intention duration.Moreover,drivers’pupil diameters become smaller during the lane-changing intention phase,and then relatively enlarge during lane-changing;the range of pupil variation is roughly 3.5 mm to 4 mm.The frequency of observing the vehicle in front of the target lane increased as the level of congestion increased,and the frequency of observation in the driver’s mirrors while changing lanes approximately doubled compared to driving straight ahead,and this ratio increased as the level of congestion increased.展开更多
文摘It has been made certain that thio-and oxy-diacetic acid hydrazides are potential anticancer compounds.However,their ability to form complexes with transition metals and the properties of the complexes thus formed have not been studied.Employing a new potential anticancer ligand 1,2-bis(thioacetic acid hydrazide)ethane prepared in our lab,along with ligands oxydiacetic hydrazide and 1,2-bis(oxyacetic acid hydrazide) ethane,a series of 11 new first-row transition metal(M=Zn^(2+),Cu^(2+),Co^(2+), Ni^(2+))complexes with each of the above three ligands have been synthesized and characterized by means of elemental analyses,IR,TG and X-ray powder diffraction.
基金supported by the National Key Research and Development Program of China(No.2016YFA0203102)the National Natural Science Foundation of China(Nos.21337004,21620102008)the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDB14020101)
文摘Size characterization of silver nanoparticles with biomolecule corona（AgNP@BCs） and mass quantification of various silver species in organisms are essential for understanding the in vivo transformation of Ag NPs. Herein, we report a versatile method that allows simultaneous determination of the size of AgNP@BCs and mass concentration of various silver species in rat liver. Both particulate and ionic silver were extracted in their original forms from the organs by alkaline digestion, and analyzed by size exclusion chromatography combined with inductively coupled plasma mass spectrometry（SEC-ICP-MS）. While the silver mass concentrations were quantified by ICP-MS with a detection limit of 0.1 μg/g, the effective diameter of AgNP@BCs was determined based on the retention time in SEC separation with size discrimination of 0.6-3.3 nm. More importantly, we found that the BC thickness of AgNP@BCs is core size independent, and a linear correlation was found between the effective diameter and core diameter of AgNP@BCs in extracted tissues, which was used to calibrate the core diameter with standard deviations in the range of 0.2-1.1 nm. The utility of this strategy was demonstrated through application to rat livers in vivo. Our method is powerful for investigating the transformation mechanism of Ag NPs in vivo.
基金the financial supports from the State Key Laboratory for Geomechanics & Deep Underground Engineering, China University of Mining and Technology (No. SKLGDUEK1002)the Fundamental Research Funds for the Central Government Supported Universities of Tongji University, China (No. 0270219037)
文摘Carbon dioxide （CO2） capture and geological storage （CCS） is one of promising technologies for greenhouse gas effect mitigation. Many geotechnical challenges remain during carbon dioxide storage field practices, among which effectively detecting CO2 from deep underground is one of engineering problems. This paper reviews monitoring techniques currently used during CO2 injection and storage. A method developed based on measuring seismic microtremors is of main interest. This method was first successfully used to characterize a site in this paper. To explore its feasibility in C02 storage monitoring, numerical simulations were conducted to investigate detectable changes in elastic wave signatures due to injection and geological storage of CO2. It is found that, although it is effective for shallow earth profile estimation, the surface wave velocity is not sensitive to the CO2 layer physical parameter variations,especially for a thin CO2 geological storage layer in a deep underground reservoir.
基金supported by funding from the Leading Innovative and Entrepreneur Team Introduction Program of Zhejiang(2019R01006)the National Natural Science Foundation of China(No.52172244).
文摘Metal oxide semiconductor-based chemiresistors have been facing challenges in achieving low-temperature hydrogen sensing at the ppb level.The oxygen vacancy is considered to play a vital role in gas sensing properties.However,a nonstoichiometric metal oxide semiconductor with efficient and controllable oxygen vacancies is not easily accessible.Herein,a facile solution reduction method of NaBH_(4)was developed to modulate the oxygen vacancies of ZnO nanosheets.The systematic characterization studies confirm the successful introduction of oxygen vacancies in ZnO samples.The gas sensing investigations illustrate that the construction of controlled oxygen vacancies greatly enhances the hydrogen sensing properties of ZnO nanosheets,especially a significantly reduced operating temperature(150℃)with a higher response(~38.2 for 200 ppm),a calculated limit of detection(55 ppb)and a quick recovery speed(only 6 s).The increased molecule adsorption and narrower band gap generated by controlled oxygen vacancies contribute to their superior sensing properties.The oxygen vacancy engineering strategy of pure metal oxide semiconductor-based materials shows great potential for creating low-temperature high-response sensors.
基金supported by the Science and Technology Program of Guangzhou,China(No.201803030019)the Key Laboratory of Renewable Energy,Chinese Academy Sciences Foundation(No.Y707j71001).We thank the support from the Analysis and Testing Center of Guangzhou Institute of Energy Conversion,Chinese Academy of Sciences.
文摘A novel photocatalyst with protonated carbon nitride(p-C_(3)N_(4))loaded with IrO_(2)quantum dots(QDs)was fabricated via a facile hydrothermal method.Structure characterization studies(XRD,STEM,XPS,UV–vis spectra and PL spectra)revealed that the IrO_(2)QDs with an average diameter of ca.
基金supported by the Key Scientific Research Project of Colleges and Universities in Henan Province(No.22A150012)the Key Scientific and Technological Project of Henan Province(no.212102311071).
文摘Achieving high performance electronic structure engineering in multi-component photocatalysts to effectively coordinate photoinduced carrier migration and surface reaction dynamics is still a key obstacle for solar-driven hydrogen production.Herein,well-defined ZnIn_(2)S_(4) nanosheets modified with metallic 1T-phase WS_(2) and Ni_(2)P dual cocatalysts with superior photoactivity and stability were fabricated by twostep ultrasonic self-assembly processes.A series of photoelectrochemical characterization studies revealed that the metallic phase 1T-WS_(2) with excellent conductivity can effectively lower the charge transport resistance and enhance electron transfer efficiency,while Ni_(2)P with abundant active sites can efficiently promote the surface H_(2)-production reaction dynamics in this dual cocatalyst system.Moreover,the synergistic effects of the 1T-WS_(2) and Ni_(2)P dual cocatalysts can boost the oxidation efficiency of the sacrificial regents(lactic acid)by elevating the valence band levels of ZnIn_(2)S_(4),which in turn promotes the separation of photocarriers.As a result,the optimized tandem Ni_(2)P/1T-WS_(2)/ZnIn_(2)S_(4) ternary heterojunction with a cascade electron transfer pathway achieved a peak hydrogen generation rate of 17.01 mmol g^(-1) h^(-1),roughly 3.34,1.56 and 1.36 times greater than those of bare ZnIn_(2)S_(4),binary 1T-WS_(2)/ZnIn_(2)S_(4) and Ni_(2)P/ZnIn_(2)S_(4),respectively.This work not only provides mechanistic insights into how dual cocatalysts influence electronic structure engineering and charge transfer dynamics but also establishes a versatile framework for the design of multi-component heterojunctions for more efficient and sustainable solarto-fuel conversion.
基金the National Natural Science Foundation of China.
文摘This paper presents the preparations and characterization of vesicles of four new fluoro- carbon amphiphiles with 1,3-disubstituted glycerol structure in common and different headgroups (OH, 1; CO_2H, 2; quaternary ammonium salt, 3; and pyridinium salt, 4). These vesicles have higher transition temperature due to the stronger hydrophobic interaction between fluorocarbon chains. Addition of fluorocarbon additives with carboxylic acid or quaternary ammonium salt head group respectively shows different influences on phase behavior of vesicles of 2. These results are discussed based on the interaction within headgroup, hydrophobicity and specific mutahydrophobic interaction between fluoro- and hydrocarbon chains.
基金supported in part by funds from Heilongjiang Provincial Key R&D Programme(Grant No.JD22A014)the Fundamental Research Funds for the Central Universities(Grant No.2572021AW35).
文摘Lane-changing behaviour is one of the complex|driving behaviours.The lane-changing behaviour of drivers may exacerbate congestion,however driver behavioural characteristics are difficult to accurately acquire and quantify,and thus tend to be simplified or ignored in existing lane-changing models.In this paper,the Bik-means clustering algorithm is used to analyse the urban road congestion state discrimination method.Then,simulated driving tests were conducted for different traffic congestion conditions.Through the force feedback system and infrared camera,the data of driver lane-changing behaviours at different traffic congestion levels are obtained separately,and the definitions of the start and end points of a vehicle changing lanes are determined.Furthermore,statistical analysis and discussion of key feature parameters including driver lane-changing behaviour data and visual data under different levels of traffic congestion were conducted.It is found that the average lane-change intention times in each congestion state are 2 s,4 s,6 s and 7 s,while the turn-signal duration and the number of rear-view mirror observations have similar patterns of change to the data on lane-changing intention duration.Moreover,drivers’pupil diameters become smaller during the lane-changing intention phase,and then relatively enlarge during lane-changing;the range of pupil variation is roughly 3.5 mm to 4 mm.The frequency of observing the vehicle in front of the target lane increased as the level of congestion increased,and the frequency of observation in the driver’s mirrors while changing lanes approximately doubled compared to driving straight ahead,and this ratio increased as the level of congestion increased.
