检索结果-南通市图书馆

维普期刊数据库

Numerical simulation on the mechanism of the normal impact of two droplets onto a thin film

在线全文

学校读者我要写书评

暂无评论

Journal of Shanghai University(English Edition) 2007年第3期11卷 210-212页

作者：郭加宏戴世强 Shanghai Institute of Applied Mathematics and Mechanics Shanghai University Shanghai 200072 P. R. China

The normal impingement process of two water droplets upon a thin film.on the solid surface was numerically investigated. The numerical treatment was based on the finite volume solution of the Navier-Stokes （N-S） equations combined with the volume of fluid method （VOF）. Physically reasonable results for the process of two droplets impacting on the thin film.were obtained. The effects of the droplet velocity, the fihn thickness and the spacing between the two droplets on the splash and spread process of the impact were examined.

关键词： numerical study droplet impact thin film.

维普期刊数据库

Structural and Electrical Characters of Ba_(0.6)Sr_(0.4)TiO_3/La_(0.5)Sr_(0.5)CoO_3 thin film. by Plus Laser Deposition

在线全文

学校读者我要写书评

暂无评论

Journal of Electronic Science and Technology of China 2007年第4期5卷 303-307页

作者： Wen-Feng Qin Jun Zhu Jie Xiong Jin-Long Tang Xiao Feng State Key Laboratory of Electronic thin film.and Integrated Devices University of Electronic Science and Technology of China （UESTC） Chcngdu 610054 China

Epitaxial Ba0.6Sr0.4TiO3 （BST） thin film. were deposited on LaAlO3 （LAO） substrates with the conductive metallic oxide La0.5 Sr0.5CoO3 （LSCO） film.as a bottom electrode by pulsed laser deposition （PLD）. X-ray diffraction 0-20 andФ scan showed that the epitaxial relationship of BST/LSCO /LAO was [001] BST// [001] LSCO//[001] LAO. The atomic force microscope （AFM） revealed a smooth and crack-free surface of BST film. on LSCO-coated LAO substrate with the average grain size of 120 nm and the RMS of 1.564 nm for BST film.. Pt/BST/LSCO capacitor was fabricated to perform Capacitance-Voltage measurement indicating good insulating characteristics. For epitaxial BST film. the dielectric constant and dielectric loss were determined as 471 and 0.03, respectively. The tunabilty was 79.59% and the leakage current was 2.63×10^-7 A/cm^2 under an applied filed of 200 kV/cm. Furthermore, it was found that epitaxial BST （60/40） fdms demonstrate well-behaved ferroelectric properties with the remnate polarization of 6.085μC/cm^2 and the coercive field of 72 kV/cm. The different electric properties from bulk BST （60/40） materials with intrinsic paraelectric characteristic are attributed to the interface effects.

关键词： BST electrode LSCO thin film.

维普期刊数据库

Synthesis, Microstructure and Superconductivity of the Infinite Layer Cuprate Compounds

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 1994年第4期 3-15页

作者：赵忠贤周兴江 Academia Sinica Beijing 100080 Institute of Physics National Laboratory for Superconductivity PRC

The infinite layer compound ACuO2(A=alkaline earth) consists of infinite stacking of CuO2sheets separated only by the alkaline earth ions. It was first postulated as the end member (n=∞) of the Bi-and TI-based superconductors AmB2Can-1CunO2(A=Bi, Ti; B=Sr, Ba) where the (n-1) adjacent layers of CaCuO2units were present in their structure unit cells. Its simplest structure among all high Tccuprate superconductors (Fig.1) may facilitate the investigation of the mechanism of superconduc-

关键词： high-Tc superconductors infinite layer structure ACuCh high pressure thin film.

Stabilization of Magnetite Nanoparticles by Encapsulation into the Silica Matrix

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Chemistry and Chemical Engineering 2014年第1期8卷 42-46页

作者： Alona Gabrene Janina Setina Inna Juhnevica Gundars Mezinskis Institute of Silicate Materials Faculty of Materials Science and Applied Chemistry Riga Technical University Riga L V-104 Latvia

Different methods have been investigated for the synthesis of magnetic nanoparticles. Control of the particle size, dispersion, purity and stability have been always regarded an issue. In this study magnetite （Fe304） superparamagnetic nanoparticles with a size range about 20 nm have been successfully synthesized using chemical co-precipitation method from the solution of ferrous/ferric mixed salt-solution in alkaline media in oxygen-free environment. The sol-gel method has been chose to encapsulate magnetic nanoparticles into silica matrix. The phase structures, morphologies, surface area, functional classes and magnetic properties have been characterized by X-ray diffraction, SEM and AFM, BET, FT-IR and VSM. The results showed that the resultant film., consisting of encapsulated magnetite have crack free and smooth surface with a roughness value 1.5 rim.

关键词： Magnetite silica matrix nanoparticles encapsulation thin film.