tailieunhanh - Báo cáo hóa học: " Hydrothermal Formation of the Head-to-Head Coalesced Szaibelyite MgBO2(OH) Nanowires"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Hydrothermal Formation of the Head-to-Head Coalesced Szaibelyite MgBO2(OH) Nanowires | Nanoscale Res Lett 2009 4 724-731 DOI s11671-009-9306-x NANO EXPRESS Hydrothermal Formation of the Head-to-Head Coalesced Szaibelyite MgBO2 OH Nanowires Wancheng Zhu Xueyi Zhang Lan Xiang Shenlin Zhu Received 9 February 2009 Accepted 25 March 2009 Published online 7 April 2009 to the authors 2009 Abstract The significant effect of the feeding mode on the morphology and size distribution of the hydrothermal synthesized MgBO2 OH is investigated which indicates that slow dropping rate drop s-1 and small droplet size mL d-1 of the dropwise added NaOH solution are favorable for promoting the one-dimensional 1D preferential growth and thus enlarging the aspect ratio of the 1D MgBO2 OH nanostructures. The joint effect of the low concentration of the reactants and feeding mode on the hydrothermal product results in the head-to-head coalesced MgBO2 OH nanowires with a length of m a diameter of 20-70 nm and an aspect ratio of 20-300 in absence of any capping reagents surfactants or seeds. Keywords Nanowires Szaibelyite Magnesium borate hydroxide Mixing Hydrothermal Introduction One-dimensional 1D nanostructures including nanotubes nanorods nanowires and nanobelts etc. have been paid extensive attention for their unique structures fantastic properties and great potential applications 1-5 . Among the multitudinous 1D nanostructures nanowires W. Zhu X. Zhang L. Xiang S. Zhu Department of Chemical Engineering Tsinghua University Beijing 100084 China e-mail zhuwc04@ L. Xiang e-mail xianglan@ W. Zhu Department of Chemical Engineering Qufu Normal University Shandong 273165 China have attracted extraordinary research interest for their multifunctionality as building blocks for bottom-up nanotechnology 6 . On the other hand the properties of 1D nanostructure were greatly dependent on the aspect ratio 7-9 longer or higher aspect ratio has now in many cases emerged as one of the focuses of the synthesis of 1D .