强激光与粒子束, 2015, 27 (7): 072001, 网络出版: 2015-07-10
Z箍缩准球形负载用TAC气凝胶的制备与表征
Fabrication and characterization of TAC aerogel used for quasi-spherical Z-pinch
三醋酸纤维素 气凝胶 超临界干燥 纳米孔微结构 Z箍缩 准球形负载 cellulose triacetate aerogel supercritical drying nanoporous Z-pinch quasi-spherical load
摘要
以三醋酸纤维素(TAC)为原料,并利用模具成型与溶胶凝胶方法,成功制备了Z箍缩准球形负载用球形及椭球形超低密度TAC气凝胶靶材料.研究了TAC溶胶凝胶化过程中光透过率随温度的变化,确定了球形与椭球形TAC气凝胶模具成型最佳凝胶化温度控制范围.TAC气凝胶微结构的扫描电子显微镜表征结果表明,该气凝胶材料结构为20~40 nm的纤维丝交错形成具有纳米孔洞的三维网络微结构;TAC气凝胶的热分析结果表明,TAC气凝胶的热分解性能与其原料接近,热分解起始温度约为320 ℃.目前该材料已成功应用于Z箍缩准球形负载物理实验中.
Abstract
Ultra-low density cellulose triacetate(TAC) spheres and ellipsoid aerogels used for quasi-spherical Z-pinch were fabricated in special moulds by using TAC granules as raw material and controlling the processing of dissolution,gelation and supercritical carbon dioxide drying.The solution-gelation processing of TAC solution when cooled to room temperature,the rheological behavior of TAC gel,and the inside microstructure and the thermogravimetry(TG) analysis of TAC aerogel were investigated.TAC solution turns to gel with high transparence when cooled to room temperature.The SEM photos showed that the aerogels had a three-dimensional nanostructured solid network and a nanoporous network together with fiber sizes about 20-40 nm.The TAC granules and the TAC aerogels were thermally stable up to 320 ℃ as indicated by TG analysis.These TAC sphere and ellipsoid aerogels were successfully used in quasi-spherical Z-pinch experiment.
张庆军, 方瑜, 罗炫, 杨睿戆, 陈姝帆, 黄传群, 王朝阳, 牛高. Z箍缩准球形负载用TAC气凝胶的制备与表征[J]. 强激光与粒子束, 2015, 27(7): 072001. Zhang Qingjun, Fang Yu, Luo Xuan, Yang Ruizhuang, Chen Shufan, Huang Chuanqun, Wang Chaoyang, Niu Gao. Fabrication and characterization of TAC aerogel used for quasi-spherical Z-pinch[J]. High Power Laser and Particle Beams, 2015, 27(7): 072001.
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