引用本文:
尹荔松, 陈敏涛, 李婷, 周克省, 高松华. 白云石制备菱面片层纳米氧化镁[J]. 物理化学学报,
2007, 23(03): 433-437.
doi:
10.3866/PKU.WHXB20070329
Citation: YIN Li-Song, CHEN Min-Tao, LI Ting, ZHOU Ke-Sheng, GAO Song-Hua. Preparation of Rhombic M Nanoflakes from Dolomites[J]. Acta Physico-Chimica Sinica, 2007, 23(03): 433-437. doi: 10.3866/PKU.WHXB20070329
Citation: YIN Li-Song, CHEN Min-Tao, LI Ting, ZHOU Ke-Sheng, GAO Song-Hua. Preparation of Rhombic M Nanoflakes from Dolomites[J]. Acta Physico-Chimica Sinica, 2007, 23(03): 433-437. doi: 10.3866/PKU.WHXB20070329
白云石制备菱面片层纳米氧化镁
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M 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M 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.
English
Preparation of Rhombic M Nanoflakes from Dolomites
Abstract:
Rhombic magnesia flakes with multi interspaces were prepared by calcining magnesium hydrate. The precursor of M could be obtained via acid immersing twice and ammonia depositing from dolomites. The structure, morphology, and composition of M 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 M nanoflakes was studied based on corresponding thermodynamics and dynamics theories.
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