Structure And Application Performance Of HAP Nanomaterials

Nano-scaled hydroxyapatite (HAP) has received increasing interests in supported catalyst and biomaterial fields. In this thsis, the effect of HAP structure on both applications performance have been studied.Different HAP morphologies have been prepared by three different methods:precipitation, hydrotherm, and bio-template. The particle size and crystallinity of samples have been characterized by TEM, FT-IR, XRD, XPS et al. In addition, Au has been loaded (1wt.%and3wt.%) on three HAP supports by deposition precipitation method. CO oxidation has been used as a test reaction to compare the catalytic performance. The best result has been obtained by Au/HR with the lowest specific surface area, better than Au/HA with higher specific surface area. The performance of catalysts has been improved when the crystallinity of support got increased.In order to diversify this research, in chapter four, a series of HAP nanorod has been used for seed breeding and cell culture. Surprisingly, the inhibition has occurred both on plant and Hela cell. Inhibition on root growth and IκBa expression has varied greatly among HAP nanoscale and dosage.