纳米氧化铝及其氧化铝空心球的制备
发布时间:2018-04-12 07:23
本文选题:纳米氧化铝 + 醇盐水解法 ; 参考:《南京理工大学》2016年硕士论文
【摘要】:α-Al_2O_3是在热力学和动力学上均为稳定的相,所需要的晶型转变温度非常高,高温会进一步促进粒子之间的团聚;壳层厚度为纳米级别的A1203空心球材料在制备过程中,具有壳层厚度不可控和不均匀的缺点。本文的主要工作是探究制备纳米氧化铝和氧化铝空心球的方法,主要内容包括三个部分:首先,采用α-Al_2O_3作为晶种,加入葡萄糖和聚乙烯吡咯烷酮作为表面活性剂,通过醇盐水解法制备了纳米氧化铝粉体,探讨了晶种、葡萄糖和聚乙烯吡咯烷酮对氧化铝晶型和形貌的影响及其最佳添加量。将所得的前驱体分别在800℃和1000℃下煅烧2h,即可以得到γ-Al_2O_3和α-Al_2O_3粉体,其粒径分别为小于20nm和20-50nm。其次,采用葡萄糖作为碳源,通过水热法制备了碳微球模板,当葡萄糖的浓度为1mol/L,反应釜空隙率为30%,在180℃下水热反应8h得到的碳微球模板分散性好,其粒径约为600nm。最后,采用碳微球作为模板,硝酸铝作为铝源,三嵌段共聚物(F127)作为表面活性剂,在葡萄糖溶液中水热反应制备碳微球-不定型氢氧化铝-碳包覆层复合物(C/Al/C),将C/Al/C复合物在600-800℃下煅烧3h即可以得到分散性好、壁厚均匀的氧化铝空心球,粒径约为700nm,壁厚约为100nm。
[Abstract]:伪 -Al2O3 is a stable phase in thermodynamics and kinetics, and the crystal transition temperature required is very high, which will further promote the agglomeration between particles.The shell thickness is uncontrollable and uneven.The main work of this paper is to explore the methods of preparing nano-alumina and alumina hollow spheres. The main contents are as follows: firstly, 伪 -Al2O3 is used as seed, glucose and polyvinylpyrrolidone are added as surfactants.The nanometer alumina powder was prepared by the hydrolysis of alcohol brine. The effects of seed, glucose and polyvinylpyrrolidone on the morphology and morphology of alumina were investigated.When the precursor was calcined at 800 鈩,
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