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Nanomaterials; calcium borate; synthesis.

Thorn-like polycrystalline Ca₂B₂O₅.H₂O microspheres with nano-sized slices were synthesized using boric acid and calcium hydroxide as reactants by a facile catalyst-free hydrothermal method at low temperature. The products were characterized by means of X-ray powder diffraction (XRD) and scanning electron microscopy (SEM). The XRD pattern reveals that the Ca₂B₂O₅.H₂O is a monoclinic phase polycrystalline with cell parameters 𝑎 = 0.6702, 𝑏 = 0.5419 and 𝑐 = 0.3558 nm. SEM also reveals that the monoclinic phase polycrystalline are thornlike microspheres composed of many flakes with an average thickness of <100 nm. Possible reaction and growth mechanism were also discussed.

Guowei Zhao¹ Laiping Zhang¹ Jilin Wang¹ Jie Li¹ Qiongli Qian¹ Xinye Pan¹ Yunle Gu^{1 2}

1. School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan 430074, Hubei, China
2. School of Materials Science and Engineering, Nano and Ceramic Materials Research Centre, Wuhan Institute of Technology, Wuhan 430074, Hubei, China

Published

October 2011

Manuscript received

14 November 2010

Manuscript revised

4 March 2011