Biosynthesis And Characterization Of Nano-Zinc Phosphate

Nanomaterials and porous materials are of scientific and technological interests because of their ability to interact with atoms, ions and molecules not only at their surfaces, but also throughout the bulk of the materials. Since the innovation of M41 S mesoporous materials by the scientists at Mobil Research and Development Corporation in 1992, researchers around the world have prepared thousands of porous materials on mesoscale with different compositions, new pore systems and novel properties based on supermolecule assembly concept. Though nanomaterials and porous materials have been used in many fields, the promising commercial utility is still lacking. To exploit the potential application of nanomaterials and mesoporous materials would be the main task in this field in the future.In this thesis, biosurfactant (microbial cells) and chemical surfactant were employed as templates to synthesize nano- and mesoporous zinc phosphate with different morphologies. The explanation of the synthetical mechanism was attempted.In the first two chapters, the definition, properties and research status about nano materials and mesoporous materials at home and abroad were introduced briefly. The synthetic route and the optimic technological condition for preparation of mesoporous zinc phosphate were determined in our experiments.In chapter 3, we describe the preparation of nano zinc phosphate and mesoporous zinc phosphate by using microbial cells (yeast cells) as template. The as-synthesized zinc phosphate powders with butterflylike microstructure were 10-80 nm in width and 80-200 nm in length. Zinc phosphate with mesoporous structure was also synthesized. The pore width was about 10 nm. A quasi-one-dimensional material of Zinc phosphate nanobelts were obtained by using candida as template.Zinc phosphate spherical nanoparticles with mono-dispersion and narrow-size distribution in diameter have been synthesized by a simple ultrasonic-assisted method at low temperature in the presence of hexadecyl trimethyl ammonium bromide (CTAB). The as-synthesized nanoparticles have an average diameter of 10 nm. Layered zinc phosphate with mesoporous structure was prepared by using CTAB as template. The as-synthesized sample has a structure that is based upon well registered yet poorly ordered porous zinc phosphate layers between which are sandwiched well organized CTAB bilayers (in chapter 4). Foliated calcium zinc phosphate nano-powder was prepared from phosphoric acid and the media-calcium zincate was synthesized by chemical precipitation using zinc oxide and calcium hydroxide as raw materials. The size of the flake was approximately 15 nm (in chapter 5).The performance was affected by the structure and the application was determined by performance. In chapter 6, we make a certain study on dielectric constant, the performance of mesoporous zinc phosphate as catalytic agent, photoluminescence, the capability as drug carrier to control the release and delivery of the drugs and the properties as corrosion preventive.