Study On The Synthesis And Modification Of Nano-biomaterial

The unique properties of inorganic nanomaterials offer excellent prospects fordesigning a new generation of devices and systems exhibiting novel functions, butsimultaneously the inorganic of nanomaterials are existed the defects, such as,bioincompatiable, toxic, nondegradable, hydrophobic, poor of chemical stability andso on. It is urgent need to modify the surface of inorganic nanomaterials to improvethe performance, cause it to obtain the better application performance. We will briefexpound the surface modification of inorganic nanomaterials, in recent years.Hydroxyapatite (HAP) was surface-modified by the addition of β-alanine (β-Ala),and the ring-opening polymerization of γ-benzyl-L-glutamate-Ncarboxy-anhydride(BLG-NCA) was subsequently initiated. HAP containing surface poly-γ-benzyl-L-glutamates (PBLG) was successfully prepared in this way. With the increase of PBLGcontent in HAP-PBLG, the solubility of HAP-PBLG increased gradually and it wasultimately soluble in chloroform. HAP-PLGA with surface carboxyl groups wasobtained by the catalytic hydrogenation of HAP-PBLG. In the process of HAPmodification, the morphology changes from rod to sheet and from flake to needle.CdSe QDs prepared by “Solution-Liquid-Solid” method.“Solution-Liquid-Solid”method used the low-melting-point as catalysts, such as Bi nanoparticles (Bi NPs).The research show that Bi NPs and its alloy nanoparticles is ideal catalyst for preparevarious of QDs or nanowire. SLS method compare to the traditional method, forElectrochemical deposition, Vapor deposition et al, it has gentle reaction conditionsand simple of reaction device properties. The sample were characterized byUV-visible, Transmission electron microscope, and Energy diffraction spectrum.Highly fluorescent cysteine-capped CdTe/CdS core-shell nanowires weresuccessfully synthesized by reacting CdCl2with NaHTe in aqueous solution underrefluxing at100℃for140min. With the increase of reaction time from10to140min, CdTe/CdS nanocrystals gradually grew into nanorods, and eventuallycompletely evolved into nanowries. The nanowires have amino and carboxylfunctional groups on their surface, and can be well dispersed in aqueous solution. The as-prepared CdTe/CdS nanowires show a fluorescence QY of7.25%due to theunique of cysteine and the formation of a CdS shell on the surface of CdTe core. theyhave a narrower diameter distribution (d=~5nm) and a length in the range of175to275nm, and their aspect ratio is between1/35and1/55...