包覆型纳米铜-银双金属粉研究

目前,导电胶或者电磁波屏蔽涂料用的导电性填料主要有三类,一是铜粉,二是银粉,三是铜-银双金属粉。铜粉具有来源广、价格低廉、导电性好等优点,但其抗氧化性能弱;银粉导电性与抗氧化性好,但其资源日益匮乏。大量的研究试图通过对铜粉进行表面改性来提高其性能。表面改性有两种方法,一是包膜处理,用SiO2溶胶处理铜粉,铜粉抗氧化性能提高,但其表面导电性能大大降低犤1犦;另一类方法是在铜粉表面覆盖一层导电性能与抗氧化性能均佳的银或金而制成双金属粉末犤2～5犦。制取高性能的铜-银双金属粉是该领域的研究重点。目前获得铜-银双金属粉的方…     

锌试剂-Cu(Ⅱ)金属配合物与牛血清蛋白作用研究

The interaction of Zincon(ZCN)-Cu(Ⅱ) metal complexe with bovine serum albumin (BSA) was investigated by UV-Vis spectrophotometric method in acidic buffer solution (pH=4.25). ZCN-Cu(Ⅱ)-BSA was a blueness color coordination compound, with maximum absorption at 605 nm with 10 nm, 60 nm and 140 nm of red shift compared to the ZCN-Cu(Ⅱ) complex, ZCN-BSA complex and ZCN. According to molar ratio method and dual wavelength method, the apparent molar absorptivity of ε was equal to 4.82×10⁵ L·mol^-1·cm^-1. Conditional constants were defined as ZCN∶Cu(Ⅱ)∶BSA=10∶5∶2. Condition combination constant of ZCN-Cu(Ⅱ) and BSA K was 8.82×10⁴. A combined mechanism was suggested between BSA and ZCN-Cu(Ⅱ) by electrostatic force (Primary action force) and distant water force. Position of Impact might be arginine, proline, histidine, tyrosine and cystine. Contemporary formation of electron transfer complexes is an important cause in forming ZCN-Cu(Ⅱ)-BSA complexes.