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1.
溴酸钾-亚甲蓝催化光度法测定硝酸盐和亚硝酸盐   总被引:16,自引:1,他引:15  
用镉柱将NO-3 还原为NO-2 ,利用在磷酸介质中NO-2 对溴酸钾氧化亚甲蓝这一褪色反应具有强烈的催化作用而建立了同时测定痕量硝酸盐和亚硝酸盐的新方法。本方法简便、快速、灵敏 ,对亚硝酸盐和硝酸盐测定的线性范围分别为 0~ 2 0 0 μg·L-1和 0 0 0 3~ 310 μg·L-1,用于测定各种水样中痕量NO-2 和NO-3 的含量均获得满意结果  相似文献   
2.
Advanced methods, allowing the controllable synthesis of ordered structural nanomaterials with favourable charges transfer and storage, are highly important to achieve ideal supercapacitors with high energy density. Herein, we report a microliter droplet‐based method to synthesize hierarchical‐structured metal–organic framework/graphene/carbon nanotubes hybrids. The confined ultra‐small‐volume reaction, give well‐defined hybrids with a large specific‐surface‐area (1206 m2 g?1), abundant ionic‐channels (narrow pore of 0.86 nm), and nitrogen active‐sites (10.63 %), resulting in high pore‐size utilization (97.9 %) and redox‐activity (32.3 %). We also propose a scalable microfluidic‐blow‐spinning method to consecutively generate nanofibre‐based flexible supercapacitor electrodes with striking flexibility and mechanical strength. The supercapacitors display large volumetric energy density (147.5 mWh cm?3), high specific capacitance (472 F cm?3) and stably deformable energy‐supply.  相似文献   
3.
运用双流体理论,在同时考虑了碳纳米管中低温氢等离子体的电子碰撞吸收和氢离子碰撞吸收的基础上,理论导出了铁催化高压歧化生成的碳纳米管中低温氢等离子体的微波吸收系数公式,数值计算了不同条件下的微波吸收系数.模拟结果表明,铁催化高压歧化生成的碳纳米管中低温氢等离子体对2.45GHz的微波产生强烈吸收.理论结果与实验数据相吻合.  相似文献   
4.
Chemical architectures with an ordered porous backbone and high charge transfer are significant for fiber‐shaped supercapacitors (FSCs). However, owing to the sluggish ion kinetic diffusion and storage in compacted fibers, achieving high energy density remains a challenge. An innovative magnetothermal microfluidic method is now proposed to design hierarchical carbon polyhedrons/holey graphene (CP/HG) core–shell microfibers. Owing to highly magnetothermal etching and microfluidic reactions, the CP/HG fibers maintain an open inner‐linked ionic pathway, large specific surface area, and moderate nitrogen active site, facilitating more rapid ionic dynamic transportation and accommodation. The CP/HG FSCs show an ultrahigh energy density (335.8 μWh cm?2) and large areal capacitance (2760 mF cm?2). A self‐powered endurance application with the integration of chip‐based FSCs is designed to profoundly drive the durable motions of an electric car and walking robot.  相似文献   
5.
Chemical architectures with an ordered porous backbone and high charge transfer are significant for fiber-shaped supercapacitors (FSCs). However, owing to the sluggish ion kinetic diffusion and storage in compacted fibers, achieving high energy density remains a challenge. An innovative magnetothermal microfluidic method is now proposed to design hierarchical carbon polyhedrons/holey graphene (CP/HG) core–shell microfibers. Owing to highly magnetothermal etching and microfluidic reactions, the CP/HG fibers maintain an open inner-linked ionic pathway, large specific surface area, and moderate nitrogen active site, facilitating more rapid ionic dynamic transportation and accommodation. The CP/HG FSCs show an ultrahigh energy density (335.8 μWh cm−2) and large areal capacitance (2760 mF cm−2). A self-powered endurance application with the integration of chip-based FSCs is designed to profoundly drive the durable motions of an electric car and walking robot.  相似文献   
6.
Apecytochrome b5 with a typical heme-binding motif of HPGC,and its variants with mutated motifs,GPGG,GPGH,HVGG,and HPGP,have been subjected to molecular dynamics simulation.Comparison of the dynamic consequences has revealed the crucial role of HPGG in assembling the heme group of cytochrome b5 and in modulating protein structure,property and function.  相似文献   
7.
研究了壳聚糖-聚乙烯基恶唑啉半互穿聚合物网络膜对PH值的敏感性,发现该膜在PH〈6时溶胀度迅速增加,在PH=3.2时达到最大值;膜在不同PH值溶液中可交替溶胀收缩,且这种溶胀-收缩行为重复可逆。  相似文献   
8.
草乌的拉曼光谱分析   总被引:1,自引:0,他引:1  
草乌是一种重要的药用和有毒植物之一,本文采用FT-Raman光谱法定性分析了生,熟草乌的组成,结果显示,草乌因加工(熟草乌)和未加工(生草乌)其拉曼光谱有不同,造成这一现象的原因可甬由于生草乌加工泡制成熟草乌所致,即导致熟草乌的毒性低于生草乌,这将有助于生、熟草乌的质量控制与毒性分析。  相似文献   
9.
直接合成性能优良的水溶性CdTe量子点,然后在其表面成功修饰花生凝集素,经过凝胶柱的分离纯化获得功能化的量子点荧光探针.基于T抗原选择性与花生凝集素(PNA)结合的特性,利用该探针对肠癌中高表达的T抗原进行检测,且与传统的荧光染料标记的免疫荧光分析进行了比较.实验结果表明:该功能化的荧光探针能够有效地识别肠癌的相关T抗原,从而为T抗原的检测以及肠癌的临床诊断与愈后判断提供了一种新的方法.  相似文献   
10.
中草药绞股蓝的傅里叶变换红外和拉曼光谱分析   总被引:6,自引:2,他引:4  
利用傅里叶变换红外和拉曼光谱法直接、快速地测定了中草药绞股蓝样品 ,并对所测样品的红外、拉曼光谱图进行比较。结果表明 ,红外光谱图中各吸收峰位置与拉曼光谱图中各散射特征峰位置相对应 ,其关系互补。采用傅里叶变换红外和拉曼光谱分析法 ,对中草药绞股蓝的成份研究和特征波谱的鉴别 ,能为合理利用绞股蓝资源和寻找绞股蓝新的有效成分提供依据  相似文献   
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