张一兵
,
翁文剑
,
杜丕一
,
沈鸽
,
韩高荣
,
叶志镇
功能材料
研究了分别以H2C2O4、HNO3、HCOOH和CH 3COOH作稳定剂的LiNbO3薄膜先驱液的稳定性,发现H 2C2O4作稳定剂的先驱液的稳定性最好;用sol-gel法在Si(110)基板上制备了以H2C2O4作稳定剂的LiNbO3薄膜,并对LiNbO3薄膜进行了IR、XRD和SEM表征,结果表明,生成的LiNbO3为多晶,与HNO3相比,以H2C2O4作稳定剂制备的LiNbO3薄膜形貌较差.
关键词:
铌酸锂
,
薄膜
,
sol-gel法
,
H2C2O4
Sensors and Actuators B-Chemical
Using non-alkoxide SnCl2 . 2H(2)O, Ce(NH4)(2)(NO3)(6) as precursors, room temperature H2S gas sensitive CeO2-SnO2 thin films have been obtained. In this paper, the synthesis process of CeO2-SnO2 thin films has been introduced; the gas sensing properties of the CeO2-SnO2 thin films were investigated and compared with those of SnO2 and ZrO2-SnO2 thin films. The experiments illustrate that CeO2-SnO2 thin film has quite a quick response and recovery behavior, high selectivity, and has better sensitivity than that of ZrO2-SnO2 thin film toward low concentration of H2S at room temperature. The sensing mechanism of CeO2-SnO2 thin films toward H2S at room temperature has also been discussed in this paper. (C) 2000 Elsevier Science S.A. All rights reserved.
关键词:
gas sensing properties;CeO2-SnO2 thin film;room temperature;sol-gel;technique;hydrogen-sulfide;sensor
Ming ZENG
,
Xinqiang YUAN
材料科学技术（英文）
Silica sol ceramic mold was made at room temperature with JN-30 silica sol, silica powder and NH4Cl. It is found that the harden time of silica sol ceramic mold is only 0.5 to 1.5 h under the amount of NH4Cl solution of 7% to 8% with 15% concentration, and less surface cracks occur by using vacuum drying. The proper vacuum drying process parameters: vacuum drying temperature is 80 to 100℃, drying time is 5 h and vacuum is 0.06 to 0.07 MPa. The harden mechanics, vacuum drying mechanics and the reason of less surface cracks of silica sol ceramic mold by vacuum drying were also analyzed in this paper.
关键词:
Silica sol
,
null
,
null
,
null
W.L. Zhang
,
B.Q. Jiang
,
Y.S. Sun
,
F. Lin and L. Gu Chemical Engineering Department of Nanchang University
,
Nanchang 330029
,
China
金属学报(英文版)
A stable colloidal boehmite sol was made with the aluminium iso propoxide made in China and used to prepare the supported γ alumina membrane using sol gel method. The γ alumina thin layer was characterized by SEM, N 2 sorption method and permeation measurement. The γ alumina membrane was prepared with uniform surface, thickness of 3 μm and average diameter of about 5 nm. The permeabilities of the single gases of H 2, N 2, Ar and their separation factors were measured. The experimental data explained a behavior of Knudsen diffusion for the gas transport through the thin membrane.
关键词:
boehmite
,
null
,
null
,
null
张敬畅
,
胡博
,
曹维良
膜科学与技术
doi:10.3969/j.issn.1007-8924.2005.04.008
采用溶胶-凝胶法(sol-gel)、化学气相沉积法(CVD)法及sol-gel-CVD组合技术制备自洁净玻璃,对光降解膜的化学组分进行了优化,通过以甲基橙为降解物对光催化性能进行考察,测试了其浸润角、膜厚,采用SEM技术对表面结构进行了表征,并对sol-gel,CVD以及sol-gel-CVD的组合技术3种方法进行比较.结果表明,采用sol-gel-CVD的组合技术制得Ti-Ce膜的洁净玻璃表面致密性最好,具有很好的亲水性,光催化性能最高,1.5 h时的降解率最好达到96.2%.
关键词:
自洁净玻璃
,
sol-gel-CVD组合技术
,
纳米TiO2复合膜
Wen WANG
,
Yu ZHOU
,
Sheng CHEN
,
Feng Y
,
Dechang JIA
材料科学技术（英文）
Strontium bismuth tantalum (SBT) fine power was prepared by Sol-Gel method. Pentaethoxy tantalum, strontium acetate and bismuth subnitrate were used as raw materials, and were dissolved in proper order in ethylene glycol to form transparent sol. The mixed precursor was dried at 80℃ and annealed at 800℃ for 1 h. Crystallized nanometer sized SBT fine powder was obtained and characterized by XRD.
关键词:
S.M.Attia
,
Jue WANG
,
Guangming WU
,
Jun SHEN
,
Jianhua MA
材料科学技术（英文）
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
章天金
,
唐超群
,
周东祥
,
潘小龙
无机材料学报
本文应用Sol－Gel方法制备了YSZ薄膜，研究了工艺条件对薄膜微观结构的影响.实验发现：基片的选择和清洁、样品的凝胶化速度、热处理过程中的升降温速率等是影响薄膜开裂的几个主要因素．XRD和SEM分析结果表明：应用Sol－Gel方法制备的YSZ薄膜，热处理温度须达800℃以上才能完全排除其中的酸根、有机基因和碳元素，且形成完整的立方相结构．薄膜经500℃、1h热处理后，其表面呈明显的海绵状结构．随着烧结温度的升高，薄膜表面变得致密，气孔明显减少，至1050℃时，薄膜表面光滑、无裂纹、无针孔、圆球形的小颗粒均匀分布．薄膜与衬底的结合紧密，薄膜厚度均匀，膜厚约为1.0μm.
关键词:
Sol-Gel法
,
YSZ films
,
preparation
,
crack
Haiping XIA
,
Zhaoyang JIANG
,
Jianli ZHANG
,
Jinhao WANG
,
Yuepin ZHANG
,
Qiuhua NIE
材料科学技术（英文）
Water soluble fullerenols were synthesized and incorporated in SiO2, SiO2-TiO2, GPTMS- SiO2, GPTMS-ATPS inorganic and organic-inorganic materials by sol-gel processes. The maximum concentrations of C60 (OH) n and C70 (OH) n in the obtained SiO2 gels were estimated to be about 0.6% and 1.5% in weight, respectively. The characteristics of the UV/visible spectra of fullerenols in H2O and various gels were measured and compared. The thermal stability of fullerenols in gels was investigated with differential thermal analysis (DTA). The results indicate that the absorption features of fullerenols in solid gels are similar to those in H2O and the fullerenols in SiO2 are stable at 400ºC. The optical limiting effect of the fullerenols was investigated preliminarily.
关键词:
Water soluble fullerenol
,
null
,
null
,
null
