多孔氧化镁纤维的制备及其生长机制研究  

Preparation and Growth Mechanism of Porous Magnesia Fibers

作　　者：游美容[1] 刘敬松[1] 张敏芳[1] 杨超[1] 

机构地区：[1]西南科技大学四川省非金属复合与功能材料重点实验室,省部共建国家重点实验室培育基地,绵阳621010

出　　处：《人工晶体学报》2013年第12期2643-2648,共6页Journal of Synthetic Crystals

摘　　要：以硫酸镁(MgSO4)为原料,氢氧化钠(NaOH)为沉淀剂,聚乙二醇(PEG)为结构导向剂,采用水热法合成出碱式硫酸镁(MgSO4·5Mg(OH)2·3H2O)纤维,对前驱体进行煅烧获得多孔氧化镁纤维。通过X射线衍射、扫描电镜、N2吸附-脱附等技术对样品的表征,分析了水热温度、水热时间对氧化镁的孔结构与形貌的影响。结果表明,水热温度和水热时间对前驱体的成分与形貌有较大的影响。在PEG(6000)与Mg物质的量比为0.01∶1的条件下,于140℃水热处理20 h后进行煅烧可合成结晶良好、孔径在几十至几百个纳米的多孔氧化镁纤维。The precursor called magnesium oxysulfate fiber （ MgSO4 5 Mg （OH） 2 3H2O） was prepared by hydrothermal method using MgSQ as raw material, NaOH as the precipitating agent, and PEG as the structure-directing agent. Porous magnesia fiber was prepared by calcining of the precursor. The effects of hydrothermal temperature, hydrothermal time on the pore structure and morphology of magnesia were analyzed. The properties of these materials were characterized by X-ray diffraction, scanning electron microscope and nitrogen ad-sorption-desorption. The results indicated that the factors such as hydrothermal temperature and hydrothermal time exerted considerable influence on the composition and morphology of the precursor. After the hydrothermal treatment at 140 ℃ for 20 h with the molar ratio of PEG（with a molecular weight of 6000 g/mol） to Mg of 0.01, the porous magnesia fiber with well crystallized, pore size varied from dozens to hundreds nanometer was generated.

关 键 词：水热法 聚乙二醇 氧化镁纤维 

分 类 号：TQ132.2[化学工程—无机化工]