School of Chemical Engineering, Nanjing University of Science and Technology is engaged in postdoctoral research and undertakes the research of hexagonal ferrite nano-stealth materials. Develop new nano-composite stealth materials. At the same time, an oxide (TiO2 _ 2) nano-catalyst was invented for the polymerization of polymeric materials (bimaleic acid). With the decrease of polymerization temperature, the heat resistance of the material is obviously enhanced. This achievement has passed the technical appraisal of Jiangsu Science and Technology Commission.
13. Tsinghua University Department of Materials is doing postdoctoral research, and as the backbone, it mainly participates in the project of "Research on High Performance BaTiO _ 3-based X7R MLCC Materials" and the "863" plan. High performance barium titanate-based X7R MLCC materials were prepared. Has been authorized by patent. X7R402 and X7R502 chip capacitors were prepared.
2. When I was a postdoctoral fellow in the Department of Materials Science and Engineering of the University of Pennsylvania (Philadelphia), I put forward the pressureless sintering technology (two-step method) to successfully prepare yttrium oxide nano-ceramics, which opened up a new method for preparing nano-ceramic materials. This paper was published in the British magazine Nature (March 2000).
⒌ High-performance low-temperature sintered ferrite sheet sensing materials and components: Based on nano-powder pressureless sintering technology, low-temperature sintering at 900℃ was realized, and fine-grained high-permeability NiCuZn ferrite sheet sensing materials (Mi & Sup31000) were prepared and applied in VHF. Chip inductors and chip miniature planar transformers with large inductance (100mH) are prepared. There are three authorized invention patents in China, one in Japan and two in the United States.
6. New generation of high-performance and low-cost multilayer ceramic capacitor materials and key technologies ("863" major project): breaking through the key technologies of thinning and miniaturization of new generation of high-performance base metal internal electrode multilayer ceramic capacitor (BME-MLCC) and preparing nano BaTiO3. By fine-tuning the ceramic "core-shell" structure and pressureless sintering technology, high performance with independent intellectual property rights has been developed, and the performance index has reached the international leading level (X7R and X7R). Seven invention patents were applied, one for the United States 1 and one for China 1.
Size effect and control principle of information functional nano/sub-micron ceramics (973 project): Nano/sub-micron functional ceramics were prepared by pressureless sintering method, and the sintering mechanism and dynamic critical zone of grain-free growth of nano/sub-micron ceramics such as ferroelectrics and ferrites were studied. The size effect, structure and properties of nano/submicron BaTiO3 and NiCuZn ferrites were systematically studied. 99.6% BaTiO3 ceramics with 8nm were prepared by pressureless sintering method for the first time. The experiment proved that the grain size was as small as 8 nm, and it still maintained ferroelectricity.
8. Titanium oxide nanotube array thin films were successfully prepared on titanium substrate by electrochemical method. The nanotube array has large area and uniform arrangement. The diameter of tubes (holes) is 10- 100 nm and the length is 1. 1 micron ... By controlling different annealing temperatures, titanium oxide single crystal nanotubes with different crystal forms were obtained. This single crystal nanotube array film has excellent photocatalytic performance and superhydrophilicity. This array has unique structure and large surface area, and has potential application prospects in many fields such as catalysis, optoelectronics, biology and solar cells.
Papers and patents:
Published nearly 160 academic papers, including more than 100 papers included in SCI.
We applied for 19 invention patents, of which 1 1 was authorized (including 3 American patents and 1 Japanese patent 1).
Representative academic papers:
1. Wang, XH, Chen IW, Nano-ceramics Sintering, Handbook of Nano-materials, Taylor and Francis Group. FL。 United States, chapter 1 2, 20061month, pp. 359-382.
⒉tian,zb； Wang,; Shu, lk; Wang, t; Song, th; Guangxi,; Li, preparation of nanometer barium titanate-based ceramics for multilayer ceramic capacitors by chemical coating method, Journal of American Ceramic Society, 92 (4): 830-833 2009
3. yang, y; Wang,; Sun,; Li, LT, Study on the Structure of Single Crystal Barium Titanate Nanotube Arrays Prepared by Hydrothermal Method, Nanotechnology, 20 [5]: Art No.055709 2009
4. yang, y; Wang,; Clock, cf; Sun,; Li, LT, Hydrothermal Synthesis of Lead Titanate Nanotube Arrays, Journal of Applied Physics, vol. 92 (13): ArtNo. 122907 2008.
Xu Xinghua, Deng Xiaoyan, Wen Hong, Li, Li Lite, Phase Transformation and High Dielectric Constant of Nanometer Barium Titanate Ceramics, Communication of Applied Physics, 89 ArtNo. 162902 OCT 16 2006.
Wang Xinghua, Chen Lilin, Wen Hong, Li Litao, observation of ferroelectric domain structure of nanometer barium titanate ceramics, applied physical communication. 89 ⒂: Article 15290 1 20061October 9.
Xue Xiaoyun, Wang Xinghua, Wen Hong, Chen Lili, Li Litao, Journal of Applied Physics. Article 88 (25): Article 252905, June 2006 19.
Two-step sintering of ceramics with equal grain size, Ⅱ. Barium titanate and nickel copper zinc ferrite. Ceram。 Socialist, 89 (2) 438-443, 2006
Wang, Chen Renze, Li Litao, Simulation of Dielectric Behavior of Multilayer Ceramic Capacitors under DC Bias Field, Journal of America. Ceram。 Socialist, 89 (2) 550-556, 2006
[2], Wang Xiaoyun, Wen Hong, Kang Yin, Gui Zhilin, Li Litao, Phase Transition of Nano-BaTiO _ 3 Ceramics Prepared by Spark Plasma Sintering, American Journal of Mechanical Engineering, 2002 .Ceram. Socialists, 89 (3)1059-1064, 2006
, Wang, Sun Tai, Li, etc. In-situ template synthesis of anatase single crystal nanotube arrays. Nanotechnology, 16:2450~2454, 2005
⒓zhao,jl； Wang,; Chen,; Li, preparation of titanium dioxide nanotube arrays by anodic oxidation, solid state communication,134 (10): 705-710, June 2005.
⒔wang,xh； Li; Sue, sy; Gui, a new ferrite material for making multilayer chip inductors-low temperature sintered Ba 3 Co 2-x Zn x Fe 24 O 4 1 hexagonal ferrite, American journal of mechanical engineering. Ceram。 Socialists, 88 (2): 478-480 February 2005
⒕wang,xh； Li; Sue, sy; Guangxi,; Yue,; Low temperature sintering and high frequency properties of co Υ z hexagonal ferrite modified by Zhou, J and Cu, J. Europe. Ceram。 Soc, 23 (5): 715-720 April 2003
Synthesis of Cu-modified Co 2 Z hexagonal crystals with planar structure by citrate precursor method, Journal of Mechanical Engineering. Magr。 Mater, 234 (2): 63-68,2001
Wang Zhihua, et al., sintered compact nanocrystalline ceramics, nature, 404, 168, 2000.