纳米颗粒的测量与表征

介绍了纳米颗粒测量的各种方法,有电镜观察法,X射线衍射线宽法,激光粒度分析法,比表面积法,颗粒沉降法,拉曼散射法,扫描探针显微术以及小角X射线散射等,并对其测量原理,测量过程,适用范围及测量方法优缺点进行了讨论。     

THE CHARACTERISTIC STRUCTURE AND ITS FORMATION MECHANISM OF GEL-SPUN UHMW-PE FIBERS

Ultra-high strength and modulus polyethylene fibers can be produced from UHMW-PE(ul-tra-high molecular weight polyethylene) by gel spinning and ultra-high drawing method.The spe-cial supermolecular structure of″shish-kebabs″ is the intrinsic course for the fiber having highperformance.In this paper,the formation mechanism of the characteristic structure of PE fibershas been investigated by means of SEM,DSC,WAXD,SAXS and TEM,The experimental resultsshow that the extended-chain structure of PE fibers is formed originally from the bridged mole-cules in amorphous region and increased gradually during further drawing porcess.The″shish-kebab″ structure is formed by the combination of extended-chalnS and originalfolded-chains.     

用标准样品测量小角X射线散射的绝对强度和入射光束能量

本文详细叙述了在ｘ射线小角散射中绝对强度测量的意义以及测量的具体方法。以标准样品聚乙烯薄片为例给出了绝对强度和入射光束能量测量的基本步骤。