Synthesis of three-dimensional hierarchical BaCrO4 dendrites |
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| Authors: | Young-Sik Cho Young-Duk Huh |
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| Affiliation: | 1. Department of Metallurgical and Materials Engineering, National Institute of Technology, Tiruchirapalli, Tamilnadu, India;2. Madanapalle Institute of Technology & Science, Madanapalle, Chittoor District, Andhra Pradesh, India;3. Department of Metallurgical and Materials Engineering, National Institute of Technology, Tiruchirapalli, Tamilnadu, India;4. Centre of Excellence in Corrosion and Surface Engineering (CECASE), National Institute of Technology, Tiruchirapalli, Tamilnadu, India;1. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, PR China;2. State Key Laboratory of Advanced Nonferrous Materials Process and Recycles, Lanzhou University of Technology, Lanzhou 730050, PR China;1. School of Mechanical & Electric Engineering, Soochow University, 178 East Ganjiang Road, Suzhou 215021, PR China;2. Institute of Materials Science & Engineering, School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, PR China;3. State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084, PR China;1. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, PR China;2. University of Chinese Academy of Sciences, Beijing 100039, PR China |
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| Abstract: | 3-D hierarchical superstructures of BaCrO4 were prepared by a hydrothermal reaction of Ba(NO3)2 and Na2CrO4 in an aqueous-hexane bilayer system. A surfactant mixture of oleylamine and oleic acid was used to form hydrophobic barium oleate micelles. During the hydrothermal process, aqueous CrO42? anions reacted at the interface with Ba2+ cations in the hexane phase to form BaCrO4 crystals. 3-D hierarchical dendritic BaCrO4 formed with a trunk and aligned, cruciform series of branches perpendicular to it. Scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM) confirmed that both trunk and branches preferentially grew in the < 001> direction. The dendrites formed through epitaxial growth. |
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