The silver oxide nanoparticles （AgONps） used in this study was obtained by laser ablation technique. On the other hand, graphene bilayers were obtained through micro mechanic exfoliation. Both techniques are conside...The silver oxide nanoparticles （AgONps） used in this study was obtained by laser ablation technique. On the other hand, graphene bilayers were obtained through micro mechanic exfoliation. Both techniques are considered clean, simple and they have economic viability. The analyses have showed a positive charge in nanoparticles and alteration in Raman spectra caused by doping in the bilayer observing the appearing of D band. The alterations in the Raman spectrums are related with the introduced defects in the crystalline chain after the nanoparticles incorporation on bilayers. However, we have been doing a systematic study about the Raman laser output in only graphene bilayer and in graphene bilayer doped with nanoparticles. These measurements have shown a clear difference to both cases. The distance between defects has been showing to be inversely proportional to the ratio ID/I6 in the analyzed cases, increasing （up power） or lowering （down power） the incident laser output, with this it was possible to handle the defect distances in the case of AgO nanoparticles/graphene bilayers. Finally, we analyzed the ratio of the integrated area of D and G band, from these parameters are determined the defect density （ND） and the defects density （LD）. Thus, we clearly find a tuning between the ND and LD as a function of laser power density Raman using to λ = 532 nm.展开更多
To improve the slow kinetics and poor mechanical strength of aqueous silver peroxide−aluminum(AgO−Al)battery cathode materials,the effects of different binders including polytetrafluoroethylene(PTFE)and polyvinylpyrro...To improve the slow kinetics and poor mechanical strength of aqueous silver peroxide−aluminum(AgO−Al)battery cathode materials,the effects of different binders including polytetrafluoroethylene(PTFE)and polyvinylpyrrolidone(PVP)on the AgO cathode material were investigated.The samples were characterized by scanning electron microscopy(SEM),transmission electron microscopy(TEM),cyclic voltammetry(CV),electrochemical impedance spectrum(EIS),and galvanostatic discharge.In contrast to the pure AgO and AgO−PTFE electrodes,the results demonstrated that the PVP effectively bound the electrode materials together.The prepared AgO−PVP as the cathode material of AgO−Al batteries could improve the battery capacity,exhibiting a high specific capacity(389.95 mA·h/g at 500 mA/cm^(2)),a high operating voltage(1.75 V at 500 mA/cm^(2)),a maximum energy density(665.65 W·h/kg),and a maximum power density(5236 W/kg).Furthermore,the electrochemical mechanism of the AgO−PVP cathode material was examined,revealing that the electrode exhibited rapid ion diffusion and effective interfacial ion/electron transport.展开更多
植物通过控制细胞分裂和伸长决定器官的形状。为了研究器官形状决定的分子机理,通过EMS诱变分离得到一个叶形细长的拟南芥突变体。细胞生物学观察发现,该基因突变不仅影响了生长点中的细胞分裂,也影响了叶片细胞的形状和数目,其表皮细...植物通过控制细胞分裂和伸长决定器官的形状。为了研究器官形状决定的分子机理,通过EMS诱变分离得到一个叶形细长的拟南芥突变体。细胞生物学观察发现,该基因突变不仅影响了生长点中的细胞分裂,也影响了叶片细胞的形状和数目,其表皮细胞凸起数明显减少,呈单轴向伸长,因此将该突变体定名为slender leaves and cells(slc)。有趣的是,不同组织内细胞分裂和伸长受到不同程度的影响,说明SLC基因在协调细胞分裂和伸长过程中起关键作用。图位克隆结果表明,SLC与小RNA介导的基因沉默相关基因AGO1等位,其第574位组氨酸突变为酪氨酸。slc和ago1杂交F1代植物呈现突变体表型,证明AGO1和SLC确实为同一基因。以上结果表明,SLC/AGO1所介导的转录后基因沉默对控制植物器官和细胞形状决定均起重要作用。展开更多
在浓氢氧化钠溶液中,通过电化学方法氧化银纳米颗粒制备得到AgO有序阵列结构电极材料。性能表征表明,所制备的AgO材料具有独特的直通孔阵列结构,有利于电解质溶液在孔隙中的扩散,可直接用作Al/AgO电池阴极,无需黏结剂等。与常规AgO阴极...在浓氢氧化钠溶液中,通过电化学方法氧化银纳米颗粒制备得到AgO有序阵列结构电极材料。性能表征表明,所制备的AgO材料具有独特的直通孔阵列结构,有利于电解质溶液在孔隙中的扩散,可直接用作Al/AgO电池阴极,无需黏结剂等。与常规AgO阴极材料相比,同等条件下,以AgO有序阵列结构材料为阴极所组成电池的放电性能大幅提高,3 C倍率下质量比容量可达422.6 m A·h·g-1,电极活性材料的利用率为97.8%,7 C倍率下质量比容量依然有387.8 m A·h·g-1,活性物质利用率89.7%。同时,循环性能相比传统电极也得到大幅提升,在第10个循环时依然保持着405.2 m A·h·g-1的质量比容量。制备方法易于操作且高效环保,有利于工业化生产;所得材料具有独特结构和性能优势。展开更多
文摘The silver oxide nanoparticles （AgONps） used in this study was obtained by laser ablation technique. On the other hand, graphene bilayers were obtained through micro mechanic exfoliation. Both techniques are considered clean, simple and they have economic viability. The analyses have showed a positive charge in nanoparticles and alteration in Raman spectra caused by doping in the bilayer observing the appearing of D band. The alterations in the Raman spectrums are related with the introduced defects in the crystalline chain after the nanoparticles incorporation on bilayers. However, we have been doing a systematic study about the Raman laser output in only graphene bilayer and in graphene bilayer doped with nanoparticles. These measurements have shown a clear difference to both cases. The distance between defects has been showing to be inversely proportional to the ratio ID/I6 in the analyzed cases, increasing （up power） or lowering （down power） the incident laser output, with this it was possible to handle the defect distances in the case of AgO nanoparticles/graphene bilayers. Finally, we analyzed the ratio of the integrated area of D and G band, from these parameters are determined the defect density （ND） and the defects density （LD）. Thus, we clearly find a tuning between the ND and LD as a function of laser power density Raman using to λ = 532 nm.
基金supported by the Fundamental Research Funds for the Central Universities of Central South University,China(No.2022XQLH046)the Technical Area Fund of Foundation Strengthening,China(No.2022-JCJQ-ZD-174-00-20)National Defense Basic Scientific Research Projects,China,and Central South University−Zijin Mining Technical Cooperation Development Project,China.
文摘To improve the slow kinetics and poor mechanical strength of aqueous silver peroxide−aluminum(AgO−Al)battery cathode materials,the effects of different binders including polytetrafluoroethylene(PTFE)and polyvinylpyrrolidone(PVP)on the AgO cathode material were investigated.The samples were characterized by scanning electron microscopy(SEM),transmission electron microscopy(TEM),cyclic voltammetry(CV),electrochemical impedance spectrum(EIS),and galvanostatic discharge.In contrast to the pure AgO and AgO−PTFE electrodes,the results demonstrated that the PVP effectively bound the electrode materials together.The prepared AgO−PVP as the cathode material of AgO−Al batteries could improve the battery capacity,exhibiting a high specific capacity(389.95 mA·h/g at 500 mA/cm^(2)),a high operating voltage(1.75 V at 500 mA/cm^(2)),a maximum energy density(665.65 W·h/kg),and a maximum power density(5236 W/kg).Furthermore,the electrochemical mechanism of the AgO−PVP cathode material was examined,revealing that the electrode exhibited rapid ion diffusion and effective interfacial ion/electron transport.
文摘植物通过控制细胞分裂和伸长决定器官的形状。为了研究器官形状决定的分子机理,通过EMS诱变分离得到一个叶形细长的拟南芥突变体。细胞生物学观察发现,该基因突变不仅影响了生长点中的细胞分裂,也影响了叶片细胞的形状和数目,其表皮细胞凸起数明显减少,呈单轴向伸长,因此将该突变体定名为slender leaves and cells(slc)。有趣的是,不同组织内细胞分裂和伸长受到不同程度的影响,说明SLC基因在协调细胞分裂和伸长过程中起关键作用。图位克隆结果表明,SLC与小RNA介导的基因沉默相关基因AGO1等位,其第574位组氨酸突变为酪氨酸。slc和ago1杂交F1代植物呈现突变体表型,证明AGO1和SLC确实为同一基因。以上结果表明,SLC/AGO1所介导的转录后基因沉默对控制植物器官和细胞形状决定均起重要作用。
文摘在浓氢氧化钠溶液中,通过电化学方法氧化银纳米颗粒制备得到AgO有序阵列结构电极材料。性能表征表明,所制备的AgO材料具有独特的直通孔阵列结构,有利于电解质溶液在孔隙中的扩散,可直接用作Al/AgO电池阴极,无需黏结剂等。与常规AgO阴极材料相比,同等条件下,以AgO有序阵列结构材料为阴极所组成电池的放电性能大幅提高,3 C倍率下质量比容量可达422.6 m A·h·g-1,电极活性材料的利用率为97.8%,7 C倍率下质量比容量依然有387.8 m A·h·g-1,活性物质利用率89.7%。同时,循环性能相比传统电极也得到大幅提升,在第10个循环时依然保持着405.2 m A·h·g-1的质量比容量。制备方法易于操作且高效环保,有利于工业化生产;所得材料具有独特结构和性能优势。
