欢迎登录材料期刊网

材料期刊网

高级检索

以正硅酸乙酯(TEOS)为硅源,采用酸碱两步催化溶胶-凝胶法和CO2超临界干燥技术成功制备出完整的厘米级SiO2气凝胶球体.当配比条件为TEOS∶ EtOH∶ H2O=1∶10∶4时制备的SiO2气凝胶球体具有典型的纳米多孔网络结构.采用扫描电镜(SEM)、透射电镜(TEM)、傅里叶变换红外光谱仪(FT-IR)、孔径分布及比表面积测试仪(BET)、纳压痕技术对SiO2气凝胶球体的表面形貌、内部结构、化学成分、比表面积、孔径分布及力学性能进行研究分析.研究表明:低温有利于制备出完整的厘米级SiO2气凝胶球体.随着凝胶温度的增加,SiO2气凝胶球体样品的收缩率逐渐增加,而孔隙率和比表面积逐渐减小.当凝胶温度为-5℃时,厘米级SiO2气凝胶球体样品的平均孔径为24.8 nm,孔体积为4.9 m3/g,比表面积高达1004.38 m2/g,密度为0.104g/cm3,收缩率约为16.2%,孔隙率约为95.3%,弹性模量和硬度最大分别为8.79 MPa与5.24 MPa.

参考文献

[1] Xiurong Zhu;Bin Zhou;Ai Du;Ke Chen;Yunong Li;Zhihua Zhang;Jun Shen;Guangming Wu;Xingyuan Ni.Potential SiO_2/CRF bilayer perturbation aerogel target for ICF hydrodynamic instability experiment[J].Fusion engineering and design,20122(2):92-97.
[2] 任洪波;万小波;张林;袁光辉;修鹏;张勇.改性SiO2气凝胶制备及其在ICF实验中的应用[J].强激光与粒子束,2006(8):1307-1310.
[3] 徐翔;周斌;刘春泽;周昌鹤;沈军;吴广明;徐超.ICF实验用气凝胶类材料的研究及应用进展[J].材料导报,2008(10):58-60,65.
[4] Hajar Maleki;Luisa Dur?es;António Portugal.An overview on silica aerogels synthesis and different mechanical reinforcing strategies[J].Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites,2014:55-74.
[5] Shi, Fei;Liu, Jing-Xiao;Song, Kai;Wang, Zhen-Yu.Cost-effective synthesis of silica aerogels from fly ash via ambient pressure drying[J].Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites,201043(43):2241-2246.
[6] Zaidong Shao;Fengzuan Luo;Xuan Cheng;Ying Zhang.Superhydrophobic sodium silicate based silica aerogel prepared by ambient pressure drying[J].Materials Chemistry and Physics,20131(1):570-575.
[7] Azadeh Tadjarodi;Marzieh Haghverdi;Vahid Mohammadi.Preparation and characterization of nano-porous silica aerogel from rice husk ash by drying at atmospheric pressure[J].Materials Research Bulletin: An International Journal Reporting Research on Crystal Growth and Materials Preparation and Characterization,20129(9):2584-2589.
[8] 卢斌;胡科;刘琪;孙俊艳;张丁日.混合前驱体常压干燥制备SiO2气凝胶及其性能研究[J].硅酸盐通报,2013(7):1443-1448.
[9] Pradip B. Sarawade;Jong-Kil Kim;Askwar Hilonga.Production of low-density sodium silicate-based hydrophobic silica aerogel beads by a novel fast gelation process and ambient pressure drying process[J].Solid state sciences,20105(5):911-918.
上一张 下一张
上一张 下一张
计量
  • 下载量()
  • 访问量()
文章评分
  • 您的评分:
  • 1
    0%
  • 2
    0%
  • 3
    0%
  • 4
    0%
  • 5
    0%