物理化学学报 >> 2007, Vol. 23 >> Issue (03): 433-437.doi: 10.3866/PKU.WHXB20070329

研究简报 上一篇    下一篇

白云石制备菱面片层纳米氧化镁

尹荔松;陈敏涛;李婷;周克省;高松华   

  1. (中南大学物理科学与技术学院, 长沙 410083)
  • 收稿日期:2006-09-25 修回日期:2006-11-16 发布日期:2007-03-07
  • 通讯作者: 尹荔松 E-mail:yinlisong2000@163.com

Preparation of Rhombic MgO Nanoflakes from Dolomites

YIN Li-Song;CHEN Min-Tao;LI Ting;ZHOU Ke-Sheng;GAO Song-Hua   

  1. (School of Physics Science and Technology, Central South University, Changsha 410083, P. R. China)
  • Received:2006-09-25 Revised:2006-11-16 Published:2007-03-07
  • Contact: YIN Li-Song E-mail:yinlisong2000@163.com

摘要: 以白云石为原料通过二次酸浸、EDTA-氨水络合法制得纳米MgO晶体, 并采用XRD、FT-IR、SEM、TEM等手段对其进行了表征. 研究表明, EDTA/PEG分子具有结构导向作用, 使Mg(OH)2分子呈外延辐射状均匀生长. 550-650 ℃煅烧前驱体制得的MgO纳米微片生长均匀, 为立方晶系结构的单晶, 具有类似花瓣状的菱面微片结构, 其厚度约为10-20 nm, 最大面积可达1 μm2左右. 氧化镁晶体沿[100]方向取向生长, 并保留了前驱体的外延辐射状生长特性. 结合热力学及动力学等相关理论研究了氧化镁纳米微片的取向生长机理.

关键词: 菱面片层MgO, 热分解, 微观形貌, 晶体生长, 影响因素

Abstract: Rhombic magnesia flakes with multi interspaces were prepared by calcining magnesium hydrate. The precursor of MgO could be obtained via acid immersing twice and ammonia depositing from dolomites. The structure, morphology, and composition of MgO and its precursor were characterized by means of XRD, FT-IR, SEM, and TEM methods. The results indicated that EDTA and PEG molecules were possessed of the effect directing the radial epitaxial growth of Mg(OH)2 flakes. The rhombic magnesia nanoflakes with 10-20 nm in thickness and up to 1 μm2 in area of main surface are single crystal with cubic crystal structure. It grows with a preferred orientation along the [100] direction and inherits the features of radial epitaxial growth of Mg(OH)2. The orientated growth mechanism of the MgO nanoflakes was studied based on corresponding thermodynamics and dynamics theories.

Key words: Rhombic magnesia flakes, Thermal decomposition, Microscopic morphology, Crystal growth, Effect factors