低密度稀土氧化物基气凝胶靶的研制

低密度的高原子序数元素氧化物气凝胶由于前驱体形成端基双键而易于收缩和开裂。通过调控配位环境结合无机分散溶胶凝胶法,制备了稀土氧化物气凝胶。氧化镧基气凝胶和氧化钇基气凝胶块体的成型性好,最低密度分别为0.05g·cm-3和0.06g·cm-3。其成分分别为六方相的La(OH)3和六方相的Y(OH)3,而聚丙烯酸中的羧基与稀土离子之间以桥接的方式进行配位。两种气凝胶均存在明显的多级结构,氧化镧基和氧化钇基气凝胶的初级粒子分别为纤维状和片/球混合形貌,而其二级粒子均为球形。两种气凝胶的比表面积分别为229.1m2·g-1和229.6m2·g-1。该方法制备的稀土氧化物气凝胶具有低的密度和纳米尺度的均匀性,在背光源中有潜在的应用。

Fabrication of rare-earth-oxide aerogel targets with low density

Low-density high-Z oxide aerogels are easy to shrink or crack due to the formation of the end group of metal-oxygen double bond in their precursors solution. Rare-earth oxide aerogels were prepared via coordination environment adjustment and dispersed inorganic sol-gel method. Lanthana-based aerogel and yttria-based aerogel exhibit good formability, and have the lowest densities of about 0.05 gcm-3 and 0.06 gcm-3 respectively. Their main compositions are hexagonal phase La(OH)3 and Y(OH)3 respectively, while the ions are coordinated with carboxyl groups in polyacrylic acid via bridge mode. Both the two kinds of aerogels are obviously composed of hierarchical microstructure, exhibiting similar spherical secondary structure but different primary structure composed of fiber and sheet/sphere, respectively. Their specific surface areas are 229.1 m2g-1 and 229.6 m2g-1, respectively. Given the low density and nanoscale homogeneity of the rare-earth oxide aerogels prepared via this method, they exhibit application potentials in the field of backlight targets.