ZnS纳米陶瓷微球的制备

以ZnCl2和Na2 S2 O3为前驱物在二氯苯/水溶液界面上,在超重力为1000/g的条件下水热合成了高密度的ZnS 纳米陶瓷微球,研究了前驱物浓度、温度和超重力大小对ZnS 纳米陶瓷微球性能的影响。采用FE-SEM,TEM, XRD,FT-IR, UV-Vis和BET对样品的形貌、微结构、物相和性能进行表征。结果发现,ZnS纳米陶瓷微球是由尺寸为2-20 nm的ZnS晶粒组成的直径为300-500 nm的微球,其密度与施加的超重力大小有关。随着超重力的增大,晶粒粒度减小,制得的ZnS纳米陶瓷微球的密度就增大。在120℃,1000/g超重力的条件下,在二氯苯/水溶液界面上反应30 min制备得到的ZnS纳米陶瓷微球具有高分散性和较高的密度。

Effect of High Gravity Field on Synthesis of ZnS Polycrystalline Microspheres

High densified ZnS polycrystalline microspheres have been successfully synthesized by the hydrothermal method with high gravity field using ZnCl2 and Na2 S2 O3 as precursors in the aqueous solution–chlorobenzene system. The effect of precursor concentration, temperature and the relative centrifugal field on the property of ZnS microspheres is investigated. The products are characterized by field-emission scanning electron microscopy (FE-SEM), Transmission electron microscopy (TEM), powder X-ray diffraction ( XRD) , UV-Vis, IR spectra and BET. It is found that the as-prepared products are the spherical ZnS particles with the diameter of 300-500nm, which is self-assembled by the crystallites with the size of 2-20nm. The density of the microsphere is relevant with the relative centrifugal field. The smaller the size of ZnS crystallites is, the bigger the density of the formed ZnS particles is. High densified ZnS polycrystalline microspheres have been successfully synthesized by the hydrothermal method with gravity field of 1000/g at 120 ℃ for 30 min in the aqueous solution–chlorobenzene system.