-
摘要: 爆轰形成的高温、高压持续时间短,使得新生的氧化钛来不及长成较大的晶粒,只能形成大量的类球形纳米微粒。在潮湿的爆生气体环境中,这些纳米氧化钛颗粒间的相互作用(如碰撞、摩擦、挤压、渗透和粘附等)比较剧烈,极易聚集成团聚体。初步分析了以硫酸氧钛为钛源、采用爆轰法合成的纳米氧化钛的团聚结构和分散形态,对经过加热至500 ℃、保温1 h热处理后的纳米氧化钛的团聚结构也进行了分析。研究结果表明:用爆轰法合成的纳米氧化钛存在软团聚和硬团聚两种形式,而经过热处理(500 ℃、1 h)的纳米氧化钛的团聚程度得到了一定的改善。此外,还分析了纳米粉体的特性、爆轰特点和爆生气体环境等因素对产生纳米氧化钛团聚结构的影响。Abstract: The short duration of high temperature and high pressure during the detonation process made the TiO2 nanoparticles not have enough time to grow into large and fine crystallites and only generate a large number of spherical-like nanoparticles. The rapid interactions between these formed TiO2 nanoparticles (such as collision, friction, extrusion, infiltration and adhesion) could easily form agglomerate structures in the humid detonation gas environment. The agglomerate structures and dispersion morphologies of the TiO2 nanoparticles prepared by detonation method using titanium titanyl sulfate as TiO2 source were studied. In order to reveal the influence of heat treatment on the agglomeration properties of the TiO2 nanoparticles, the agglomerate structures of the TiO2 nanoparticles via heat treatment at 500 ℃ for 1 h were also analyzed. Research showed that the soft and hard agglomerates of the TiO2 nanoparticles were formed and that the agglomerate structures of the TiO2 nanoparticles after heat treatment could be improved to some extent. The influences of nanoparticle characteristics, detonation characteristics and detonation gas environment on the formation of the agglomerate structures of TiO2 nanoparticles were also discussed.
-
Key words:
- TiO2 nanoparticles /
- agglomerate structure /
- detonation method /
- agglomeration mechanism
-
Yeh Y C, Tseng T Y, Chang D A. Electrical Properties of Porous Titania Ceramic Humidity Sensors [J]. J Am Ceram Soc, 1989, 72(8): 1472-1475. Gao L, Li Q, Song Z, et al. Preparation of Nano-Scale Titania Thick Film and Its Oxygen Sensitivity [J]. Sens Actuators, 2000(B), 71(3): 179-183. Gebeyehu D, Brabec C J, Sariciftci N S. Solid-State Organic/Inorganic Hybrid Solar Cells Based on Conjugated Polymers and Dye-Sensitized TiO2 Electrodes [J]. Thin Solid Films, 2002, 403-404: 271-274. Shao Y Z, Zhong W R, Ren S, et al. Multifractal Spectra of Growing Clusters in Nano Scale Characterized by Small Angle X-Ray Scattering [J]. Acta Phys Sin, 2005, 54(7): 3290-3296. (in Chinese) 邵元智, 钟伟荣, 任山, 等. 纳米团聚生长的多重分形谱 [J]. 物理学报, 2005, 54(7): 3290-3296. Zarzyck I J, Prassa S M, Phalippo U I. Synthesis of Glasses from Gels: The Problem of Monolithic Gels [J]. J Maters Sci, 1982, 17(3): 371-373. Flagan R C, Lunden M M. Particle Structure Control in Nanoprticle Synthesis from the Vapor Phase [J]. Mater Sci Eng, 1995(A), 204(1): 113-115. Kaliszewski M S. Heuer A H. Alcohol Interaction with Zirconia Powders [J]. J Am Ceram Soc, 1990, 73(6): 1504-1509. Maskra A, Smith D M. Agglomeration during the Drying of Fine Silica Powders(Part Ⅱ): The Role of Particle Solubility [J]. J Am Ceram Soc, 1997, 80(7): 1715-1722. Qu Y D, Li X J, Li R Y, et al. Preparation and Characterization of the TiO2 Ultrafine Particles by Detonation Method [J]. Mater Res Bull, 2008, 43(1): 97-103. Qu Y D, Li X J, Wang X H, et al. Detonation Synthesis of Nanosized Titanium Dioxide Powders [J]. Nanotechnology, 2007, 18(20): 205602(1)-205602(5). Qu Y D, Li X J, Yan H H, et al. Selective Synthesis of TiO2 Nanopowders [J]. Glass Phys Chem, 2008, 34(5): 637-639. Qu Y D. Research on Synthesis of Titanium Dioixde Nanoparticles by Detonation Method [D]. Dalian: Dalian University of Technology, 2008: 17-19. (in Chinese) 曲艳东. 爆轰法合成氧化钛纳米粉研究 [D]. 大连: 大连理工大学, 2008: 17-19. Zhang S W, Yang N H. Nanometer Particles Agglomeration in Gas Flows [J]. Chinese Journal of Vacuum Science and Technology, 2001, 21(2): 87-90. (in Chinese) 张世伟, 杨乃恒. 纳米粒子在气体流动中的团聚过程研究 [J]. 真空科学与技术学报, 2001, 21(2): 87-90. Li X J, Qu Y D, Sun G L, et al. Study on the Lattice Distortion of the as-Prepared Nanosized TiO2 Particles via Detonation Method [J]. J Phys Chem Sol, 2007, 68(12): 2405-2410. Qu Y D, Li X J, Yan H H. Effects of Detonation on the Microstructure of Nanocrystallites [J]. Rare Metal Mater Eng, 2007, 36(Suppl 3): 249-254. (in Chinese) 曲艳东, 李晓杰, 闫鸿浩. 爆轰对纳米晶体微结构的影响 [J]. 稀有金属材料与工程, 2007, 36(增3): 249-254.
点击查看大图
计量
- 文章访问数: 8770
- HTML全文浏览量: 345
- PDF下载量: 800