建立了氨基酸及多肽的电喷雾离子迁移谱检测方法。采用自制的电喷雾离子迁移谱装置,在室温条件下以甲醇为溶剂,空气为漂移气体,流速为1000 m L/min,电喷液流速为2!L/min,测试了甘氨酸、胱氨酸、组氨酸、精氨酸4种氨基酸及缓激肽片段(1~7...建立了氨基酸及多肽的电喷雾离子迁移谱检测方法。采用自制的电喷雾离子迁移谱装置,在室温条件下以甲醇为溶剂,空气为漂移气体,流速为1000 m L/min,电喷液流速为2!L/min,测试了甘氨酸、胱氨酸、组氨酸、精氨酸4种氨基酸及缓激肽片段(1~7)和P物质2种多肽的离子迁移谱,计算出上述化合物的约化迁移率。离子迁移谱图反映出化合物的结构信息,具有指纹谱特征。此装置在1 min的检测时间内对P物质的检测灵敏度达到855 ng/m L。结果表明,电喷雾离子迁移谱可用于氨基酸及多肽类化合物的现场快速鉴定。展开更多
Nanowire arrays of various metals were fabricated from the template of porous alumina. We observed the strong surface enhanced Raman scattering(SERS) signals of the adsorbed molecules such as pyridine not only at the ...Nanowire arrays of various metals were fabricated from the template of porous alumina. We observed the strong surface enhanced Raman scattering(SERS) signals of the adsorbed molecules such as pyridine not only at the noble metals nanowires that exhibit a high SERS activity, but also at Ni, Co nanowires that are normally considered to be non SERS active substrates. The intensity of the species adsorbed at Ni nanowires is stronger than that on the conventionally roughened metal surface, and depends on the length of the nanowires out of alumina matrix. The metal nanowire arrays can be used as SERS active substrates.展开更多
The dependence of charge transfer resistances of electrodes in the aqueous Zn/V 2O 5 secondary battery on the Zn 2+ amount intercalated was studied by means of AC impedance experiments. The results showed that the ele...The dependence of charge transfer resistances of electrodes in the aqueous Zn/V 2O 5 secondary battery on the Zn 2+ amount intercalated was studied by means of AC impedance experiments. The results showed that the electrode reaction on cathode was controlled by the diffusion of Zn 2+ at the beginning of the discharge process. With the increase of Zn 2+ amount intercalated into the cathode, the reaction became a kinetic controlled process, i.e.a process controlled by intercalation of Zn 2+ in V 2O 5.展开更多
文摘Nanowire arrays of various metals were fabricated from the template of porous alumina. We observed the strong surface enhanced Raman scattering(SERS) signals of the adsorbed molecules such as pyridine not only at the noble metals nanowires that exhibit a high SERS activity, but also at Ni, Co nanowires that are normally considered to be non SERS active substrates. The intensity of the species adsorbed at Ni nanowires is stronger than that on the conventionally roughened metal surface, and depends on the length of the nanowires out of alumina matrix. The metal nanowire arrays can be used as SERS active substrates.
文摘The dependence of charge transfer resistances of electrodes in the aqueous Zn/V 2O 5 secondary battery on the Zn 2+ amount intercalated was studied by means of AC impedance experiments. The results showed that the electrode reaction on cathode was controlled by the diffusion of Zn 2+ at the beginning of the discharge process. With the increase of Zn 2+ amount intercalated into the cathode, the reaction became a kinetic controlled process, i.e.a process controlled by intercalation of Zn 2+ in V 2O 5.
