Qinyuan ZHANG
,
Guangming WU
,
Bin ZHOU
,
Jun SHEN
,
Jue WANG
,
Zhonggang WU
,
Xiaohong JI
材料科学技术（英）
Transparent mixed phase (1 - x)V2O5 -xTiO(2) (x=0,0.1,0.2,0.3,0.4) thin films were prepared on indium tin oxide (ITO) coated glass via sol-gel process. The films were characterized by cyclic voltammetry, optical spectroscopy, scanning electron microscopy, IR and X-ray diffractometer. Electrochemical lithium insertion/extraction showed that the porous structure of sol-gel (1 - x)V2O5-xTiO(2) thin films exhibited good recharge ability of Li+/e(-) insertion/extraction process. For a 220 nm thick (1 - x)V2O5-xTiO(2) film with 90% V2O5, the capacity of charge exchange reached 9 mC/cm(2). In both Li+ intercalated and free states, the films were highly transparent to visible light. Such films have potential applications in counter electrodes for electrochromic smart windows and other electrochemical devices.
关键词:
Jianfei SUN
,
Jun SHEN
,
Fuyang CAO
,
Qingchun LI
材料科学技术（英）
In this paper, the behaviors of nucleation and growth of atomizing droplets were investigated by means of microstructure observation and theoretical analysis. The results showed that, there is a unique heterogeneous nucleation mechanism for atomizing process that pre-solid smaller particles colliding with and embedding in liquid-state larger ones act as heterogeneous nuclei. In addition, the reasons of presenting the dendritic growth was analyzed based on the nonequilibrium solute distribution theory, and the relationship between the microstructural refinement and the cooling rate of the material was given.
关键词:
Guangming WU
,
Jun SHEN
,
Tianhe YANG
,
Bin ZHOU
,
Jue WANG
材料科学技术（英）
Structural strengthening of the nano porous silica films has been reported. The films were prepared with a base/acid two-step catalyzed TEOS-based sol-gel processing and dip-coating, and then baked in the mixed gas of ammonia and water vapor. The silica films were characterized with TEM, AFM, FTIR, spectrophotometer, ellipsometer, and abrasion test, respectively. The experimental results have shown that the films have a nanostructure with a low refractive index and can form an excellent scratch-resistant broadband anti-reflectance. The two-step catalysis noticeably strengthens the films, and the mixed gas treatment further improves mechanical strength of the silica network. Finally the strengthening mechanism has been discussed.
关键词:
Sol-gel process
,
null
,
null
,
null
S.M.Attia
,
Jue WANG
,
Guangming WU
,
Jun SHEN
,
Jianhua MA
材料科学技术（英）
Sol-gel process is one of the simplest techniques to manufacture thin films. The quality of the prepared films depends on the parameters of the sol-gel process and the used technique for deposition. A great variety of the sol-gel derived films have been prepared for different applications. We present a review on the sol-gel derived coatings. The description of the process is introduced in details. Different sol-gel deposition techniques are mentioned. The optical applications of the sol-gel derived coatings are reviewed.
关键词:
Sol-gel process
,
null
,
null
