超低密度SiO<sub>2</sub>气凝胶的制备研究

鄢林; 杨帆; 罗炫; 张林

doi:10.11884/HPLPB202032.190447

超低密度SiO₂气凝胶的制备研究

doi: 10.11884/HPLPB202032.190447

详细信息

作者简介:
鄢　林（1996—），男，硕士研究生，从事纳米多孔材料、半导体光催化方面的研究；yanlin77@sina.cn

中图分类号: O648
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出版历程
- 收稿日期: 2019-12-04
- 修回日期: 2019-12-31
- 发布日期: 2020-03-17

Preparation of ultra-low density SiO₂ aerogel

摘要

摘要: 超低密度的SiO₂气凝胶是一种经典的三维网状纳米多孔材料，已经广泛应用于如保温隔热、吸附等多种领域。以四甲氧基硅烷（TMOS）为硅源，采用酸碱两步法，利用乙醇超临界干燥技术制备了超低密度的SiO₂气凝胶，分别利用SEM\TEM\BET等表征手段对该气凝胶进行了一系列的研究，发现当其密度为0.6 mg/cm³时，气凝胶拥有最佳的综合性能。该种气凝胶具有超低密度、高比表面积、加工成型性好、制备周期短等优点，有望在激光惯性约束聚变实验中作为冷冻靶发挥巨大的作用。
- ICF /
- SiO₂ /
- 气凝胶 /
- 超低密度
Abstract: Ultra-low density SiO₂ aerogel as a classic three-dimensional network nano-porous material is widely used in many fields such as thermal insulation and adsorption. In this manuscript, tetramethoxysilane (TMOS) is used as the silicon source and an acid-base two-step method is used. Ultra-low density SiO₂ aerogels were prepared by ethanol supercritical drying technology, and a series of studies were performed on the aerogels using SEM\TEM\BET and other characterization methods. When the aerogel density was 0.6 mg/cm³, it had the best comprehensive properties. In addition, this aerogel has the advantages of ultra-low density, high specific surface area, good formability, and short preparation cycle. Thus, it is expected to play a significant role as a frozen target in laser inertial confinement fusion experiments.
- ICF /
- SiO₂ /
- aerogel /
- ultra-low density

HTML全文

图 1 0.6 mg/cm³ SiO₂气凝胶样品图

Figure 1. Photo of 0.6 mg/cm³ silica aerogels

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图 2 普通密度与超低密度SiO₂气凝胶结构示意图

Figure 2. Schematic illustration of ordinary density and ultra-low density SiO₂ aerogel

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图 3 0.6 mg/cm³ SiO₂气凝胶扫描和透射和水接触角图像

Figure 3. SEM, TEM images and the contact angle value of 0.6 mg/cm³ silica aerogels

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图 4 0.6 mg/cm³ SiO₂气凝胶的红外谱图和XRD谱图

Figure 4. FTIR spectrum and XRD pattern of 0.6 mg/cm³ silica aerogel

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图 5 0.6 mg/cm³二氧化硅气凝胶的等温吸脱附曲线和孔径分布曲线

Figure 5. N₂ adsorption/desorption isotherms and pore size distributions of 0.6 mg/cm³ silica aerogels

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参考文献(13)

[1]	Kistler S S. Coherent expanded aerogels and jellies[J]. Nature, 1931, 127(3211): 741.
[2]	Du A, Zhou B, Zhang Z, et al. A special material or a new state of matter: A review and reconsideration of the aerogel[J]. Materials, 2013, 6(3): 941-968. doi: 10.3390/ma6030941
[3]	Ciriminna R, Fidalgo A, Pandarus V, et al. The sol-gel route to advanced silica-based materials and recent applications[J]. Chemical Reviews, 2013, 113(8): 6592-6620. doi: 10.1021/cr300399c
[4]	Thapliyal P C, Singh K, Kirti S. Aerogels as promising thermal insulating materials: An overview[J]. Journal of Materials, 2014: 1-10.
[5]	Jang K Y, Kim K, Upadhye R S. Study of sol-gel processing for fabrication of hollow silica-aerogel spheres[J]. Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films, 1990, 8(3): 1732-1735.
[6]	谭秀兰, 刘颖, 刘晓波, 等. ICF靶用泡沫铜的制备与表征[J]. 强激光与粒子束, 2008, 20(9):1452-1456. (Tan Xiulan, Liu Ying, Liu Xiaobo, et al. Preparation and characterization of foamed copper for ICF[J]. High Power Laser and Particle Beams, 2008, 20(9): 1452-1456
[7]	Pan Y, He S, Gong L, et al. Low thermal-conductivity and high thermal stable silica aerogel based on MTMS/water-glass co-precursor prepared by freeze drying[J]. Materials & Design, 2017, 113: 246-253.
[8]	高银, 张林, 李泽甫, 等. 低密度Cu掺杂SiO₂复合气凝胶的制备及表征[J]. 强激光与粒子束, 2014, 26:012003. (Gao Yin, Zhang Lin, Li Zefu, et al. Preparation and characterization of low-density Cu-doped SiO₂ composite aerogels[J]. High Power Laser and Particle Beams, 2014, 26: 012003 doi: 10.3788/HPLPB20142601.12003
[9]	徐超, 周斌, 吴广明, 等. 超低密度SiO₂气凝胶的制备及成型研究[J]. 强激光与粒子束, 2005, 17(11):1674-1678. (Xu Chao, Zhou Bin, Wu Guangming, et al. Preparation and molding of ultralow-density silica aerogels[J]. High Power Laser and Particle Beams, 2005, 17(11): 1674-1678
[10]	任洪波, 万小波, 张林, 等. 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, 18(8):1307-1310. (Ren Hongbo, Wan Xiaobo, Zhang Lin, et al. Preparation of modified silica aerogel and its appilication in inertial confinement fusion (ICF) experiment[J]. High Power Laser and Particle Beams, 2006, 18(8): 1307-1310
[11]	邓忠生, 魏建东, 王珏, 等. 低密度SiO₂气凝胶的结构与吸附特性研究[J]. 强激光与粒子束, 1999, 11(2):215-219. (Deng Zhongsheng, Wei Jiandong, Wang Jue, et al. Structure and vapor adsorption of low-density silica aerogel[J]. High Power Laser and Particle Beams, 1999, 11(2): 215-219
[12]	Primout M, Babonneau D, Jacquet L, et al. A new hybrid target concept for multi-keV X-ray sources[J]. High Energy Density Physics, 2013, 9(4): 750-760. doi: 10.1016/j.hedp.2013.09.002
[13]	Hazi A. Lightweight target generates bright, energetic X-rays[R]. Lawrence Livermore National Laboratory, 2006.