硼酸镁纳米晶须的水热-熔盐焙烧合成研究

以MgCl2·6H2O、H3BO3和NaOH为原料,采用定-转子反应器合成MgBO2 (OH)前驱体,水热合成MgBO2 (OH)纳米棒,进而熔盐焙烧合成了直径为50 ～105 nm、长度为6～13μm(平均长径比为120)、高度分散的纯单斜相单晶Mg2B2O5纳米晶须.采用XRD、SEM、EDX、TEM及SAED等手段进行表征.研究发现,MgBO2( OH)纳米棒的最佳合成条件是水热温度为210℃、水热时间为8h,该条件下可获得分散良好、形貌规则,尺寸分布范围窄的MgBO2 (OH)纳米棒.

Synthesis of Magnesium Borate Nanowhiskers via Hydrothermal-Molten Salt Calcination Method

MgBO2(OH) nanorods have been synthesized using MgCl2·6H2O,H3BO3 and NaOH as materials.The process involved precursor slurry of MgBO2(OH) preparation by rotor-stator reactor and subsequent hydrothermal method.Then pure single crystalline monoclinic Mg2B2O5 nanowhiskers with high dispersity were synthesized by sintering above MgBO2(OH) nanorods.The size results of Mg2B2O5 nanowhiskers are as follows: diameters are in the range of 50-105 nm,lengths are in the range of 6-13 μm and average aspect ratio is 120.The samples were characterized by XRD,SEM,EDX,TEM and SAED.Results show that the optimal hydrothermal temperature and hydrothermal time for MgBO2(OH) nanorods are 210 ℃ and 8 h respectively,here MgBO2(OH) nanorods with good dispersity,regular morphology and narrow size distribution could be synthesized.