Leached Pt-Fe and Pt-Co catalysts were prepared by acid leaching the reduced catalysts in acid solution. Oxidation treatments of leached catalysts produced the structure o f metal oxides decorat-ing the surface of...Leached Pt-Fe and Pt-Co catalysts were prepared by acid leaching the reduced catalysts in acid solution. Oxidation treatments of leached catalysts produced the structure o f metal oxides decorat-ing the surface of nanoparticles. The fully oxidized Fe2O3 and Co3O4 species on Pt nanoparticle sur-faces result in the low performance of the CO complete oxidation （COOX） reaction. In contrast, un-saturated FeO and CoO surface species can be formed during exposure to the CO preferential oxida-tion （CO-PROX） reaction with an excess of H2, leading to a high O2 activation ability and enhancing the CO-PROX activity. The FeOx surface structures can be transformed between these two states by varying the reactive gas environments, exhibiting oscillating activity in these two reactions. Con-versely, the CoO surface structure formed in the H2 -rich atmosphere is stable when exposed to the COOX reaction and exhibits similar activity in these two reactions. It is hoped that this work may assist in understanding the important role of surface oxides in real reactions.展开更多
为提高质子交换膜燃料电池(PEMFC)电催化剂的催化活性,并降低其成本,利用循环伏安法电沉积制备Pt-Fe合金催化剂,并以其作为PEMFC阴极。通过X射线衍射仪(XRD)、循环伏安法(CV)、能谱仪(EDS)、扫描电子显微镜(SEM)测试技术对催化剂样品进...为提高质子交换膜燃料电池(PEMFC)电催化剂的催化活性,并降低其成本,利用循环伏安法电沉积制备Pt-Fe合金催化剂,并以其作为PEMFC阴极。通过X射线衍射仪(XRD)、循环伏安法(CV)、能谱仪(EDS)、扫描电子显微镜(SEM)测试技术对催化剂样品进行性能表征。通过循环伏安线性扫描法确定Pt-Fe合金的沉积电位,并探究了电沉积过程中电解液温度、电位和扫描速率对催化剂样品形貌以及电催化性能的影响。结果表明:电解液温度主要对催化剂沉积量及分散性起作用,对形貌影响不大,扫描速率主要对晶体生长产生影响;电位扫描范围为-0.4~0.6 V、扫描速率为100 m V/s,电解液温度为50℃时,电沉积得到的Pt-Fe合金催化剂的颗粒在碳布表面呈空心球状且分散均匀,与其他沉积电位制得的样品相比较,合金中Pt/Fe原子比相对较高,其具有最大的电化学活性表面积,为64.30 m2/g,电催化活性最佳。展开更多
[Objective] In order to reveal the effects of reducing the amount of novel nano-carbon humic acid water-retaining fertilizer(CSF) on soil microbial community structure and citrus growth. [Method]In this study,conventi...[Objective] In order to reveal the effects of reducing the amount of novel nano-carbon humic acid water-retaining fertilizer(CSF) on soil microbial community structure and citrus growth. [Method]In this study,conventional fertilization was as the control(KC1) in Wanzhou citrus orchard of Three Gorges Reservoir area. CSF reductions by 0%(KC2),10%(KC3),20%(KC4),30%(KC5) and 40%(KC6) were used to analyze the changes of soil bacterial community structure,citrus yield and quality. [Result]The results showed that the observed species,Shannon index,Chao1 index and PDwholetree of KC6 were higher than those of KC1,and were the same as KC2. The abundance of Xanthomonadaceae was the highest in KC5. Compared with KC1,the Xanthomonadaceae in KC3,KC4 and KC6 was significantly decreased,and the levels of Nitrosomonadaceae and Pseudomonasaceae were higher than that of KC1 after the treatment of KC6. Sphingomonas in different reduction treatments was lower than that of KC1,but Burkholderia and Pseudomonas were significantly higher than those of KC1. It was found that the similarity among treatments was small after bacterial community similarity clustering analysis,and citrus yield increased somewhat after CSF fertilization reduction.When CSF fertilization reduced by 30%,citrus yield increased by 4. 50%. When CSF fertilization reduced by 40%,citrus yield decreased by4. 14%. After CSF fertilization,citrus quality did not change significantly in CSF conventional fertilization and reduction of 10% and 40%,while significantly decreased in 20% and 30% of fertilization reduction. [Conclusion] CSF fertilization reduction changed the diversity of soil bacterial community structure and the yield and quality of citrus.展开更多
Objective:To investigate the effect and safety of nano-carbon on shoulder joint after lymphatic chemotherapy for breast cancer. Methods:164 patients Breast cancer patients, Sc group (docetaxel + CNP), Dd group (doceta...Objective:To investigate the effect and safety of nano-carbon on shoulder joint after lymphatic chemotherapy for breast cancer. Methods:164 patients Breast cancer patients, Sc group (docetaxel + CNP), Dd group (docetaxel), Sc group and Dd group were selected to observe shoulder joint function, docetaxel concentration in Sc group and Dd group after 12 h, 24 h, 36 h and 48 h injection of chemotherapy, apoptotic index of metastatic lymph nodes, apoptosis rate of lymph node cells, Sc group and Dd group were observed. The occurrence of adverse reactions. Results:The concentration of paclitaxel in the lymph nodes of the Sc group was significantly higher than that of the Dd group at 12h, 24h, 36, 48h. The concentration of paclitaxel was the highest in the group of 24h in the Sc group, and the lowest in the 48h group. 0.05);The AI index of the chemotherapy group was significantly higher than that of the Dd group at 12h, 24h, 36, 48h in the Sc group (P<0.05). The AI index of the AI index of the 36h injection chemotherapy group and the 48h injection chemotherapy group in the Sc group and the Dd group were compared. The difference was not significant (P>0.05). The apoptosis rate of lymphocytes in the group of 12h, 24h, 36th and 48h in the Sc group was significantly higher than that in the Dd group (P<0.05). The patients in the Sc group and the Dd group were injected with chemotherapy for 48 hours. There was no significant difference in lymph node cell apoptosis rate between the injection chemotherapy patients (P>0.05);the incidence of adverse reactions in the Dd group (15%) was higher than that in the Sc group (7.1%), but there was no difference (P>0.05);There was no significant difference in the function of shoulder joint function between the Dd group and the Dd group (P>0.05). The score of the shoulder joint function score in the Sc group was increased compared with the Dd group (P<0.05). Conclusions:Carbon nanoparticles are of high value and safety in the application of lymphatic chemotherapy to shoulder joint after breast cancer surgery, which is worthy of wide application in clinical treatment of breast cancer.展开更多
The effect of nano-carbon black content(O,8 and 12 wt.%)on the wettability of molten steel on Al_(2)O_(3)-C substrates was investigated by the sessile drop wetting method at 1500℃ under argon atmosphere.At the beginn...The effect of nano-carbon black content(O,8 and 12 wt.%)on the wettability of molten steel on Al_(2)O_(3)-C substrates was investigated by the sessile drop wetting method at 1500℃ under argon atmosphere.At the beginning of the wetting experiment,the contact angle decreased with the increase in nano-carbon black content.As the wetting experiment progressed,FeAl_(2)0_(4) layer and sheet Al_(2)O_(3) layer were found at the interface between the molten steel and the Al_(2)O_(3)-C substrates with O and 8 wt.% nano-carbon black content,and the contact angle deceased with time.When the content of nano-carbon black was 12 wt.%,a large number of nano-Al_(2)O_(3) whiskers were observed,which made the contact angle between the molten steel and Al_(2)O_(3)-C substrate become large.Based on the scanning electron microscope and energy dispersive spectrometry results,the formation mechanism of FeAl2O4 layer and Al_(2)O_(3) layer and the interfacial reaction mechanism were proposed.展开更多
A novel method was described for the production of silver nanoparticle by using nano-carbon as active template.Special ultrasonic condition was used to assure the active effect of the template and achieve an even and ...A novel method was described for the production of silver nanoparticle by using nano-carbon as active template.Special ultrasonic condition was used to assure the active effect of the template and achieve an even and stable micro-reactor system,therefore yield uniform silver nanoparticle without obvious agglomeration.By laser granularity instrument measurement,the silver nanoparticles show a mean diameter of 20.4 nm and narrow distribution between 18.7 nm and 23.0 nm according to the optimum technology.Regular spherical morphology can be observed by transmission electron microscopy(TEM).X-ray diffraction analysis indicates that Ag+ is deoxidized to form metal Ag during producing precursor,subsequent calcinations promote phase transformation from nonholonomic crystal to complete cubic crystal,which is consistent with the standard JCPDS card of silver.The results reveal that the nano-carbon in active template system not only exerts micro-reactor and steric stabilization effect,but also acts as reducing agent during the reaction.展开更多
Porous Pt-Fe bimetallic nanocrystals have been synthesized via self-assembly and can effectively facilitate the synthesis of 2-propanol from acetone. The bimetallic catalyst has three--dimensional channels and shows t...Porous Pt-Fe bimetallic nanocrystals have been synthesized via self-assembly and can effectively facilitate the synthesis of 2-propanol from acetone. The bimetallic catalyst has three--dimensional channels and shows turnover frequencies （TOFs） of up to 972 h^-1 for a continuous process more than 50 h. Preliminary mechanistic studies suggest that the high reactivity is related to the interface consisting of a bimetallic Pt-Fe alloy and Fe2O3-x. An understanding of real catalytic behavior and the catalytic mechanism based on model systems has been shown to help fabricate an improved Pt/Fe3O4 catalyst with increased activity and lifetime which has great potential for large-scale industrial applications.展开更多
基金supported by the National Natural Science Foundation of China(21403004,21403003)~~
文摘Leached Pt-Fe and Pt-Co catalysts were prepared by acid leaching the reduced catalysts in acid solution. Oxidation treatments of leached catalysts produced the structure o f metal oxides decorat-ing the surface of nanoparticles. The fully oxidized Fe2O3 and Co3O4 species on Pt nanoparticle sur-faces result in the low performance of the CO complete oxidation （COOX） reaction. In contrast, un-saturated FeO and CoO surface species can be formed during exposure to the CO preferential oxida-tion （CO-PROX） reaction with an excess of H2, leading to a high O2 activation ability and enhancing the CO-PROX activity. The FeOx surface structures can be transformed between these two states by varying the reactive gas environments, exhibiting oscillating activity in these two reactions. Con-versely, the CoO surface structure formed in the H2 -rich atmosphere is stable when exposed to the COOX reaction and exhibits similar activity in these two reactions. It is hoped that this work may assist in understanding the important role of surface oxides in real reactions.
文摘为提高质子交换膜燃料电池(PEMFC)电催化剂的催化活性,并降低其成本,利用循环伏安法电沉积制备Pt-Fe合金催化剂,并以其作为PEMFC阴极。通过X射线衍射仪(XRD)、循环伏安法(CV)、能谱仪(EDS)、扫描电子显微镜(SEM)测试技术对催化剂样品进行性能表征。通过循环伏安线性扫描法确定Pt-Fe合金的沉积电位,并探究了电沉积过程中电解液温度、电位和扫描速率对催化剂样品形貌以及电催化性能的影响。结果表明:电解液温度主要对催化剂沉积量及分散性起作用,对形貌影响不大,扫描速率主要对晶体生长产生影响;电位扫描范围为-0.4~0.6 V、扫描速率为100 m V/s,电解液温度为50℃时,电沉积得到的Pt-Fe合金催化剂的颗粒在碳布表面呈空心球状且分散均匀,与其他沉积电位制得的样品相比较,合金中Pt/Fe原子比相对较高,其具有最大的电化学活性表面积,为64.30 m2/g,电催化活性最佳。
基金Supported by the National Natural Science Foundation of China(41571303)Science and Technology Development Plan of Tai’an City,Shandong Province(2018HZ0115)
文摘[Objective] In order to reveal the effects of reducing the amount of novel nano-carbon humic acid water-retaining fertilizer(CSF) on soil microbial community structure and citrus growth. [Method]In this study,conventional fertilization was as the control(KC1) in Wanzhou citrus orchard of Three Gorges Reservoir area. CSF reductions by 0%(KC2),10%(KC3),20%(KC4),30%(KC5) and 40%(KC6) were used to analyze the changes of soil bacterial community structure,citrus yield and quality. [Result]The results showed that the observed species,Shannon index,Chao1 index and PDwholetree of KC6 were higher than those of KC1,and were the same as KC2. The abundance of Xanthomonadaceae was the highest in KC5. Compared with KC1,the Xanthomonadaceae in KC3,KC4 and KC6 was significantly decreased,and the levels of Nitrosomonadaceae and Pseudomonasaceae were higher than that of KC1 after the treatment of KC6. Sphingomonas in different reduction treatments was lower than that of KC1,but Burkholderia and Pseudomonas were significantly higher than those of KC1. It was found that the similarity among treatments was small after bacterial community similarity clustering analysis,and citrus yield increased somewhat after CSF fertilization reduction.When CSF fertilization reduced by 30%,citrus yield increased by 4. 50%. When CSF fertilization reduced by 40%,citrus yield decreased by4. 14%. After CSF fertilization,citrus quality did not change significantly in CSF conventional fertilization and reduction of 10% and 40%,while significantly decreased in 20% and 30% of fertilization reduction. [Conclusion] CSF fertilization reduction changed the diversity of soil bacterial community structure and the yield and quality of citrus.
文摘Objective:To investigate the effect and safety of nano-carbon on shoulder joint after lymphatic chemotherapy for breast cancer. Methods:164 patients Breast cancer patients, Sc group (docetaxel + CNP), Dd group (docetaxel), Sc group and Dd group were selected to observe shoulder joint function, docetaxel concentration in Sc group and Dd group after 12 h, 24 h, 36 h and 48 h injection of chemotherapy, apoptotic index of metastatic lymph nodes, apoptosis rate of lymph node cells, Sc group and Dd group were observed. The occurrence of adverse reactions. Results:The concentration of paclitaxel in the lymph nodes of the Sc group was significantly higher than that of the Dd group at 12h, 24h, 36, 48h. The concentration of paclitaxel was the highest in the group of 24h in the Sc group, and the lowest in the 48h group. 0.05);The AI index of the chemotherapy group was significantly higher than that of the Dd group at 12h, 24h, 36, 48h in the Sc group (P<0.05). The AI index of the AI index of the 36h injection chemotherapy group and the 48h injection chemotherapy group in the Sc group and the Dd group were compared. The difference was not significant (P>0.05). The apoptosis rate of lymphocytes in the group of 12h, 24h, 36th and 48h in the Sc group was significantly higher than that in the Dd group (P<0.05). The patients in the Sc group and the Dd group were injected with chemotherapy for 48 hours. There was no significant difference in lymph node cell apoptosis rate between the injection chemotherapy patients (P>0.05);the incidence of adverse reactions in the Dd group (15%) was higher than that in the Sc group (7.1%), but there was no difference (P>0.05);There was no significant difference in the function of shoulder joint function between the Dd group and the Dd group (P>0.05). The score of the shoulder joint function score in the Sc group was increased compared with the Dd group (P<0.05). Conclusions:Carbon nanoparticles are of high value and safety in the application of lymphatic chemotherapy to shoulder joint after breast cancer surgery, which is worthy of wide application in clinical treatment of breast cancer.
基金This work was funded by the National Natural Science Foundation of China(No.51974214)the Natural Science Funds of Hubei Province for Distinguished Young Scholars(Grant No.2020CFA088).
文摘The effect of nano-carbon black content(O,8 and 12 wt.%)on the wettability of molten steel on Al_(2)O_(3)-C substrates was investigated by the sessile drop wetting method at 1500℃ under argon atmosphere.At the beginning of the wetting experiment,the contact angle decreased with the increase in nano-carbon black content.As the wetting experiment progressed,FeAl_(2)0_(4) layer and sheet Al_(2)O_(3) layer were found at the interface between the molten steel and the Al_(2)O_(3)-C substrates with O and 8 wt.% nano-carbon black content,and the contact angle deceased with time.When the content of nano-carbon black was 12 wt.%,a large number of nano-Al_(2)O_(3) whiskers were observed,which made the contact angle between the molten steel and Al_(2)O_(3)-C substrate become large.Based on the scanning electron microscope and energy dispersive spectrometry results,the formation mechanism of FeAl2O4 layer and Al_(2)O_(3) layer and the interfacial reaction mechanism were proposed.
文摘A novel method was described for the production of silver nanoparticle by using nano-carbon as active template.Special ultrasonic condition was used to assure the active effect of the template and achieve an even and stable micro-reactor system,therefore yield uniform silver nanoparticle without obvious agglomeration.By laser granularity instrument measurement,the silver nanoparticles show a mean diameter of 20.4 nm and narrow distribution between 18.7 nm and 23.0 nm according to the optimum technology.Regular spherical morphology can be observed by transmission electron microscopy(TEM).X-ray diffraction analysis indicates that Ag+ is deoxidized to form metal Ag during producing precursor,subsequent calcinations promote phase transformation from nonholonomic crystal to complete cubic crystal,which is consistent with the standard JCPDS card of silver.The results reveal that the nano-carbon in active template system not only exerts micro-reactor and steric stabilization effect,but also acts as reducing agent during the reaction.
基金This work was supported by the National Basic Research Program of China （Nos. 2011CB932401, 2011CBA00500, and 2012CB224802）, and the National Natural Science Foundation of China （Nos. 21221062, 21171105, 21322107 and 21131004）.
文摘Porous Pt-Fe bimetallic nanocrystals have been synthesized via self-assembly and can effectively facilitate the synthesis of 2-propanol from acetone. The bimetallic catalyst has three--dimensional channels and shows turnover frequencies （TOFs） of up to 972 h^-1 for a continuous process more than 50 h. Preliminary mechanistic studies suggest that the high reactivity is related to the interface consisting of a bimetallic Pt-Fe alloy and Fe2O3-x. An understanding of real catalytic behavior and the catalytic mechanism based on model systems has been shown to help fabricate an improved Pt/Fe3O4 catalyst with increased activity and lifetime which has great potential for large-scale industrial applications.
