【2017年整理】磁场诱导水热合成法制备纳米材料.ppt

磁场诱导水热合成法;主要内容;水热法基本原理;水热结晶：溶解———再结晶机理 ;水热法装置图;磁场诱导钴纳米晶的组装;工艺流程;THE CHEMICAL REACTION FOR THE SYNTHESIS OF COBALT NANOCRYSTALLITES ;; a) SEM micrographs of Co wires obtained at 110℃ for 36 hours under a 0.25T external magnetic field, b) higher magnification of a), and c) HRTEM image of a particle in the wire, showing that the particle is single crystalline. The magnified SEM image shows nearly parallel wires, HRTEM suggests that the wire is composed of Co nanocrystallites. ; SEM micrographs of products prepared at 110℃ for 24 hours a, b) without and c) with a 0.25T external magnetic field. b) is the magnified image of a).; SEM images of cobalt formed under a 0.25T magnetic field for a) 12h, b) 24h, respectively. c) An enlargement of the boxed region in b) is shown in c), showing spherical particles self-assembly to form a linear chain. d) Magnified image of c), showing the connection of spherical particles in a wire. ? ;;The hysteresis loops measured at room temperature for produces obtained with (A) and without (B) external magnetic field。 ;磁场诱导针形镍纳米晶的一维组装;工艺流程;THE CHEMICAL REACTION FOR THE SYNTHESIS OF NICKEL NANOCRYSTALLITES ;XRD pattern of nickel nanocrystallites prepared with a 0.25T magnetic field applied .;SEM micrographs of products prepared at 70℃ for 3 hours without a) and with a 0.25T magnetic field applied b).;Representative TEM images of two samples obtained a) without and b) with a 0.25T external magnetic field applied. a1) Inset in a) shows an image of a sample post-synthesis magnetic alignment of ZF sample under a 0.25T magnetic field. c) A magnified image of a wire within b), of which c1 and c2 are two SAED patterns taken on the surface of a wire and an acicular nanocrystallite, respectively, and c3 is its HRTEM image. ;Sketch of ideal process of assembly of acicular Ni particles induced by an external magnetic field. ;The hysteresis loops measured at room temperature for three samples obtained a) with a 0.25T and b) without an external magnetic