Transparent films ofPoly （methylmethacrylate） doped with different concentrations （0, 3 and 4）wt% of Sb203 nanoparticles were prepared using solution cast technique. The transmission and absorption spectra have be...Transparent films ofPoly （methylmethacrylate） doped with different concentrations （0, 3 and 4）wt% of Sb203 nanoparticles were prepared using solution cast technique. The transmission and absorption spectra have been recorded in the wavelength range 200-800 nm. Optical constants （absorption coefficient, optical band gap, refractive index and extinction coefficient） of as prepared and after CO2 laser irradiated films have been studied as a function of photon energy. It has been found that the optical parameters of the films were changed significantly after laser treatments. Results show that the energy gaps and the absorption edges shifted to lower energies with the increase in dopant concentration and laser irradiation. The results are interpreted in terms of the change in concentration of localized states.展开更多
INTRODUCTION Cell apoptosis,which involves the biologic regulation of the numbers and vital activity of cells,is an important metaboloc process in both normal cells and tumor cells.
A novel Sb2O3/Sb2S3/FeOOH photoanode was fabricated via a simple solution impregnation method along with chemical bath deposition and post-sulfidation.The X-ray diffractometry,Raman measurement,and X-ray photoelectron...A novel Sb2O3/Sb2S3/FeOOH photoanode was fabricated via a simple solution impregnation method along with chemical bath deposition and post-sulfidation.The X-ray diffractometry,Raman measurement,and X-ray photoelectron spectroscopy show that the Sb2O3/Sb2S3/FeOOH thin films are successfully prepared.SEM−EDS analyses reveal that the surface of Sb2O3/Sb2S3 thin films becomes rough after the immersion in the FeCl3 solution.The optimized impregnation time is found to be 8 h.The FeOOH co-catalyst loaded Sb2O3/Sb2S3 electrode exhibits an enhanced photocurrent density of 0.45 mA/cm2 at 1.23 V versus RHE under simulated 1 sun,which is approximately 1.41 times compared to the photocurrent density of the unloaded one.Through the further tests of UV−Vis spectroscopy,the electrochemical impedance spectra,and the PEC measurements,the enhancement can result from the increased light-harvesting ability,the decreased interface transmission impedance,and the remarkably enhanced carrier injection efficiency.展开更多
Antimony sulfide–selenide Sb2（S,Se）3,including Sb2S3and Sb2Se3,can be regarded as binary metal chalcogenides semiconductors since Sb2S3and Sb2Se3are isomorphous.They possess abundant elemental storage,nontoxicity,g...Antimony sulfide–selenide Sb2（S,Se）3,including Sb2S3and Sb2Se3,can be regarded as binary metal chalcogenides semiconductors since Sb2S3and Sb2Se3are isomorphous.They possess abundant elemental storage,nontoxicity,good stability with regard to moisture at elevated temperatures and suitable physical parameters for light absorption materials in solar cells.To date,quite a few attempts have been conducted in the materials synthesis,photovoltaic property investigation and device fabrication.Benefiting from previous investigation in thin film solar cells and new generation nanostructured solar cells,this class of materials has been applied in either sensitized-architecture or planar heterojunction solar cells.Decent power conversion efficiencies from 5%to 7.5%have been achieved.Apparently,further improvement on the efficiency is required for future practical applications.To give an overview of this research field,this paper displays some typical researches regarding the methodologies toward the antimony sulfide–selenide synthesis,development of interfacial materials and device fabrications,during which we highlight some critical findings that promote the efficiency enhancement.Finally,this paper proposes some outstanding issue regarding fundamental understanding of the materials,some viewpoints for the efficiency improvement and their future challenges in solar cell applications.展开更多
This study was conducted to do exposure assessment of the possible migration of antimony trioxide （Sb203） from Polyethylene terephthalate （PET） food contact materials （FCM）. Consumption Factor （CF） and Food-ty...This study was conducted to do exposure assessment of the possible migration of antimony trioxide （Sb203） from Polyethylene terephthalate （PET） food contact materials （FCM）. Consumption Factor （CF） and Food-type Distribution Factor （fT） were calculated from survey data with reference to the US FDA method. The most conservative migration conditions were obtained by testing Sb migration from PET FCM based on the Chinese national standard of GB/T 5009.101-2003[1].展开更多
Objective： To investigate the apoptosis induction by arsenic trioxide （As2O3） in Raji cells and its correlation with cell cycle arrest and expression of the Survivin gene. Methods： After Raji cells were treated wi...Objective： To investigate the apoptosis induction by arsenic trioxide （As2O3） in Raji cells and its correlation with cell cycle arrest and expression of the Survivin gene. Methods： After Raji cells were treated with As2O3 in different concen- trations （1, 2, 4 and 8 pM）, for 24, 48 and 72 h, respectively, and cell proliferation was tested by MTT assay. Apoptosis was observed with electron microscope and DNA electrophoresis. The distribution of cell cycles and cell apoptosis were detected by flow cytometry. Expression of the Survivin gene was determined by real-time quantitative RT-PCR. Results： As2O3 （1-8 μM） inhibited Raji cells growth effectively in a dose- and time-dependent manner. As2O3 at 2-8μM could induce cell apoptosis and cell cycle arrest. However, As2O3（1 μM） inhibited Raji proliferation only by cell cycle arrest, without any symptoms of cell apoptosis. At the same time, Survivin gene expression was down-regulated after the treatment. Conclusion： As2O3 could induce substantial proliferation inhibition, cell cycle arrest and apoptosis in Raji cell. Cell cycle arrest might be a reason why apoptosis occurs. As2O3 can markedly down-regulate expression of the Survivin gene in a dose- and timedependent manner. The down-regulated Survivin gene might be leading to cell apoptosis by As2O3.展开更多
Objective： The aim of the study was to investigate the prospective study if treatment with arsenic trioxide （AS2O3） could enhance disease-free survival as adjuvant post-operative chemotherapy for gastric cancer pat...Objective： The aim of the study was to investigate the prospective study if treatment with arsenic trioxide （AS2O3） could enhance disease-free survival as adjuvant post-operative chemotherapy for gastric cancer patients and protect bone marrow from the negative effects of chemotherapy. Methods： 84 adults were randomized into two groups. Patients in treament group were treated with As2O3 and FOLFOX regimen, the other were administered with FOLFOX regimen only. Results： Four patients were withdrawn in treatment group after 3-4 cycles and the reasons were headache and fidgety （n = 2）, rhythmia （n = 1） and AST/ALT elevation （n = 1）, while 1 patient in control group after 4 cycles for neutropenia. In the treatment group, the median DFS was 28.34 months （95% CI, 25-33 months）. While in control group, the median DFS was 24.50 months （95% CI, 20-30 months）. This difference was not statistically significant （chi-square： 2.8885; P value： 0.0892）. Pa- tients in the same subgroup of node-positive was 29 in the treatment group and 32 in control group, respectively. The median DFS was 27.87 months （95% CI, 25-31 months） in the treatment group and 24.18 months （95% CI, 19-31 months） in the control group with promising statistical significance （HR 1.89; chi-square： 4.78; P value： 0.0287）. The most common grades 3-4 toxicity was leucopenia （n = 11） in control group and the difference was significant （chi-square： 3.9768, P value： 0.046） compared with that in treatment group （n = 4）. Conclusion： The combination of arsenic trioxide and FOLFOX regimen has a potential advantage of enhancing disease-free survival in patients with gastric cancer in nodal-positive status as post-operative chemotherapy, and protect bone marrow from the negative effects of chemotherapy.展开更多
To explore thin transparent electroluminescence and electric conductive films by sol-gel technique, Sb2O3 doped n-type ZnO ceramics powders were prepared by sol-gel technique and photoluminescence properties were meas...To explore thin transparent electroluminescence and electric conductive films by sol-gel technique, Sb2O3 doped n-type ZnO ceramics powders were prepared by sol-gel technique and photoluminescence properties were measured. Then, the influences of composition and heat treatment temperature on photoluminescence properties were investigated in detail. With respect to the dopant concentration, about 1mol% addition of Sb2O3 was effective to increase photoluminescence intensity. With respect to heat treatment temperature, 800℃ was appropriate, and rather higher heat treatment temperature resulted in the formation of Zn7Sb2O12 and decrease the intensity. The excited ultraviolet wavelength of 200nm was proper to intense photoluminescence.展开更多
We report on the fabrication and characterization of multi-leg bismuth telluride (Bi2Te3) and antimony telluride (Sb2Te3) thermoelectric devices. The two materials were deposited, on top of SiO2/Si substrates, using P...We report on the fabrication and characterization of multi-leg bismuth telluride (Bi2Te3) and antimony telluride (Sb2Te3) thermoelectric devices. The two materials were deposited, on top of SiO2/Si substrates, using Pulsed Laser Deposition (PLD). The SiO2 layer was used to provide insulation between the devices and the Si wafer. Copper was used as an electrical connector and a contact for the junctions. Four devices were built, where the Bi2Te3 and Sb2Te3 were deposited at substrate temperatures of 100°C, 200°C, 300°C and 400°C. The results show that the device has a voltage sensitivity of up to 146 μV/K and temperature sensitivity of 6.8 K/mV.展开更多
文摘Transparent films ofPoly （methylmethacrylate） doped with different concentrations （0, 3 and 4）wt% of Sb203 nanoparticles were prepared using solution cast technique. The transmission and absorption spectra have been recorded in the wavelength range 200-800 nm. Optical constants （absorption coefficient, optical band gap, refractive index and extinction coefficient） of as prepared and after CO2 laser irradiated films have been studied as a function of photon energy. It has been found that the optical parameters of the films were changed significantly after laser treatments. Results show that the energy gaps and the absorption edges shifted to lower energies with the increase in dopant concentration and laser irradiation. The results are interpreted in terms of the change in concentration of localized states.
文摘INTRODUCTION Cell apoptosis,which involves the biologic regulation of the numbers and vital activity of cells,is an important metaboloc process in both normal cells and tumor cells.
基金Project(51674298)supported by the National Natural Science Foundation of ChinaProject(2017JJ3384)supported by the Natural Science Foundation of Hunan Province,ChinaProject(2018M630910)supported by the China Postdoctoral Science Foundation。
文摘A novel Sb2O3/Sb2S3/FeOOH photoanode was fabricated via a simple solution impregnation method along with chemical bath deposition and post-sulfidation.The X-ray diffractometry,Raman measurement,and X-ray photoelectron spectroscopy show that the Sb2O3/Sb2S3/FeOOH thin films are successfully prepared.SEM−EDS analyses reveal that the surface of Sb2O3/Sb2S3 thin films becomes rough after the immersion in the FeCl3 solution.The optimized impregnation time is found to be 8 h.The FeOOH co-catalyst loaded Sb2O3/Sb2S3 electrode exhibits an enhanced photocurrent density of 0.45 mA/cm2 at 1.23 V versus RHE under simulated 1 sun,which is approximately 1.41 times compared to the photocurrent density of the unloaded one.Through the further tests of UV−Vis spectroscopy,the electrochemical impedance spectra,and the PEC measurements,the enhancement can result from the increased light-harvesting ability,the decreased interface transmission impedance,and the remarkably enhanced carrier injection efficiency.
基金supported by the Recruitment Program of Global Expertsthe Fundamental Research Funds for the Central Universities(Nos.WK2060140022,WK2060140023 and WK2060140024)
文摘Antimony sulfide–selenide Sb2（S,Se）3,including Sb2S3and Sb2Se3,can be regarded as binary metal chalcogenides semiconductors since Sb2S3and Sb2Se3are isomorphous.They possess abundant elemental storage,nontoxicity,good stability with regard to moisture at elevated temperatures and suitable physical parameters for light absorption materials in solar cells.To date,quite a few attempts have been conducted in the materials synthesis,photovoltaic property investigation and device fabrication.Benefiting from previous investigation in thin film solar cells and new generation nanostructured solar cells,this class of materials has been applied in either sensitized-architecture or planar heterojunction solar cells.Decent power conversion efficiencies from 5%to 7.5%have been achieved.Apparently,further improvement on the efficiency is required for future practical applications.To give an overview of this research field,this paper displays some typical researches regarding the methodologies toward the antimony sulfide–selenide synthesis,development of interfacial materials and device fabrications,during which we highlight some critical findings that promote the efficiency enhancement.Finally,this paper proposes some outstanding issue regarding fundamental understanding of the materials,some viewpoints for the efficiency improvement and their future challenges in solar cell applications.
基金financially supported by the Beijing Natural Science Foundation-Sanyuan Joint FundingNo.15S00033
文摘This study was conducted to do exposure assessment of the possible migration of antimony trioxide （Sb203） from Polyethylene terephthalate （PET） food contact materials （FCM）. Consumption Factor （CF） and Food-type Distribution Factor （fT） were calculated from survey data with reference to the US FDA method. The most conservative migration conditions were obtained by testing Sb migration from PET FCM based on the Chinese national standard of GB/T 5009.101-2003[1].
基金a grand from the Educational Committee Scientific Research Foundation of Yunnan Province. (No. 06z095c).
文摘Objective： To investigate the apoptosis induction by arsenic trioxide （As2O3） in Raji cells and its correlation with cell cycle arrest and expression of the Survivin gene. Methods： After Raji cells were treated with As2O3 in different concen- trations （1, 2, 4 and 8 pM）, for 24, 48 and 72 h, respectively, and cell proliferation was tested by MTT assay. Apoptosis was observed with electron microscope and DNA electrophoresis. The distribution of cell cycles and cell apoptosis were detected by flow cytometry. Expression of the Survivin gene was determined by real-time quantitative RT-PCR. Results： As2O3 （1-8 μM） inhibited Raji cells growth effectively in a dose- and time-dependent manner. As2O3 at 2-8μM could induce cell apoptosis and cell cycle arrest. However, As2O3（1 μM） inhibited Raji proliferation only by cell cycle arrest, without any symptoms of cell apoptosis. At the same time, Survivin gene expression was down-regulated after the treatment. Conclusion： As2O3 could induce substantial proliferation inhibition, cell cycle arrest and apoptosis in Raji cell. Cell cycle arrest might be a reason why apoptosis occurs. As2O3 can markedly down-regulate expression of the Survivin gene in a dose- and timedependent manner. The down-regulated Survivin gene might be leading to cell apoptosis by As2O3.
基金Supported by a grant from the Harbin Technologies R&D Program of China (No.2004AA9CS196-9)
文摘Objective： The aim of the study was to investigate the prospective study if treatment with arsenic trioxide （AS2O3） could enhance disease-free survival as adjuvant post-operative chemotherapy for gastric cancer patients and protect bone marrow from the negative effects of chemotherapy. Methods： 84 adults were randomized into two groups. Patients in treament group were treated with As2O3 and FOLFOX regimen, the other were administered with FOLFOX regimen only. Results： Four patients were withdrawn in treatment group after 3-4 cycles and the reasons were headache and fidgety （n = 2）, rhythmia （n = 1） and AST/ALT elevation （n = 1）, while 1 patient in control group after 4 cycles for neutropenia. In the treatment group, the median DFS was 28.34 months （95% CI, 25-33 months）. While in control group, the median DFS was 24.50 months （95% CI, 20-30 months）. This difference was not statistically significant （chi-square： 2.8885; P value： 0.0892）. Pa- tients in the same subgroup of node-positive was 29 in the treatment group and 32 in control group, respectively. The median DFS was 27.87 months （95% CI, 25-31 months） in the treatment group and 24.18 months （95% CI, 19-31 months） in the control group with promising statistical significance （HR 1.89; chi-square： 4.78; P value： 0.0287）. The most common grades 3-4 toxicity was leucopenia （n = 11） in control group and the difference was significant （chi-square： 3.9768, P value： 0.046） compared with that in treatment group （n = 4）. Conclusion： The combination of arsenic trioxide and FOLFOX regimen has a potential advantage of enhancing disease-free survival in patients with gastric cancer in nodal-positive status as post-operative chemotherapy, and protect bone marrow from the negative effects of chemotherapy.
文摘To explore thin transparent electroluminescence and electric conductive films by sol-gel technique, Sb2O3 doped n-type ZnO ceramics powders were prepared by sol-gel technique and photoluminescence properties were measured. Then, the influences of composition and heat treatment temperature on photoluminescence properties were investigated in detail. With respect to the dopant concentration, about 1mol% addition of Sb2O3 was effective to increase photoluminescence intensity. With respect to heat treatment temperature, 800℃ was appropriate, and rather higher heat treatment temperature resulted in the formation of Zn7Sb2O12 and decrease the intensity. The excited ultraviolet wavelength of 200nm was proper to intense photoluminescence.
文摘We report on the fabrication and characterization of multi-leg bismuth telluride (Bi2Te3) and antimony telluride (Sb2Te3) thermoelectric devices. The two materials were deposited, on top of SiO2/Si substrates, using Pulsed Laser Deposition (PLD). The SiO2 layer was used to provide insulation between the devices and the Si wafer. Copper was used as an electrical connector and a contact for the junctions. Four devices were built, where the Bi2Te3 and Sb2Te3 were deposited at substrate temperatures of 100°C, 200°C, 300°C and 400°C. The results show that the device has a voltage sensitivity of up to 146 μV/K and temperature sensitivity of 6.8 K/mV.
