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Effect of annealing on the characteristics of Au/Ni_(50)Fe_(50) bilayer films grown on glass

Journal of University of Science and Technology Beijing 2007年第2期14卷 160-166页

作者： Hao Qian Hong Qiu Xiaobai Chen Yue Tian Ping Wu Fengping Wang Liqing Pan Applied Science School University of Science and Technology Beijing Beijing 100083 China Department of Mathematics and Physics Beijing Technology and Business University Beijing 100037 China

Sputter-deposited Au/NisoFeso bilayer films were annealed in a vacuum of 5×10^-4 Pa at 523 to 723 K for 30 or 90 min. The characteristics of the bilayer films were determined by Auger electron spectroscopy, field emission scanning electron microscopy, X- ray diffractometry, a four-point probe technique, and an alternating gradient magnetometer. When the annealing temperature and time reached 723 K and 90 min, Ni and Fe atoms markedly diffused into the Au layer. The grain size of the Au layer did not change markedly with the annealing condition. As the annealing time was 30 min and the annealing temperature exceeded 573 K, the resistance of the bilayer film increased with increasing the annealing temperature. Furthermore, the resistance of the bilayer film annealed at 723 K for 90 ,nin was lower than that of the bilayer film annealed at 723 K for 30 min. All the bilayer films showed magnetic hysteresis loops. The as-deposited bilayer film showed a hard magnetization. The bilayer film represented an easy magnetization with increasing the annealing temperature. The Au/Ni50Fe50 film that annealed at 723 K for 90 min had the lowest saturation magnetization.

关键词： Au/Ni50Fe50 bilayer film annealing diffusion characteristic

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High temperature oxidation resistance of CrN/(Ti,Al,Zr,Cr)N bilayer films deposited by multi-arc ion plating

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Journal of Iron and Steel Research(International) 2017年第3期24卷 343-349页

作者： Shi-lu Zhao Zhen Zhang Jun Zhang Jian-ming Wang Zheng-gui Zhang Shuang-hong Wang School of Mechanical Engineering Shenyang University Shenyang 110044 Liaoning China Paint Shop Planning BMW Brilliance Automotive Ltd. Shenyang 110113 Liaoning China

CrN/（Ti,Al,Zr,Cr） N bilayer films were successfully deposited on cemented carbide（ WC-8% Co） substrates by multi-arc ion plating process using two Ti-Al-Zr alloy targets and one pure Cr target. As a result of bilayered structure and addition of alloying elements（ e. g. Al and Cr）,the films exhibited excellent high temperature oxidation resistance under both short-term isothermal（ up to 800 ℃） and long-term cyclic（ up to 600 ℃） exposure conditions. Combined with pre-established outstanding tribological properties（ e. g. maximum hardness of 4 000HV0. 01 and maximum adhesion strength over 200 N）,these observations make such films quite a promising candidate to extend the cutting tool life span and boost the performance in high-productivity,high-speed and high-feed cutting or in dry machining conditions.

关键词： Nitride bilayer film Cemented carbide Multi-arc ion plating High temperature oxidation resistance

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Magnetotransport properties of La0.67Ca0.33MnO3//La0.67Sr0.33MnO3 bilayers

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Chinese Physics B 2005年第9期14卷 1879-1881页

作者：丰家峰赵昆黄延红赵见高韩秀峰詹文山黄康权 Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100080 China Spintronics Laboratory School of Physics Science and Information Technology Liaocheng University Liaocheng 252059 China International Center for Materials Physics Chinese Academy of Sciences Shenyang 110016 China Department of Physics The Chinese University of Hong Kong Hong Kong

The perovskite bilayers La0.67Ca0.33MnO3 （LCMO）（100 nm） / La0.67Sr0.33MnO3（LSMO）（100 nm） and LSMO （100 nm） / LCMO （100 nm） are fabricated by a facing-target sputtering technique. Their transport and magnetic properties are investigated. It is found that the transport properties between them are different obviously due to distinguishable structures, and the different lattice strains in both films result in the difference of metal-to-insulator transition. Only single-step magnetization loop appears in our bilayers from 5K to 320K, and the coercive force of LSMO/LCMO varies irregularly with a minimum ～ 2387A/m which is lower than that of LCMO and LSMO single layer films. The behaviour is explained by some magnetic coupling.

关键词： manganites magnetic coupling bilayer film

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Design of a gastroretentive mucoadhesive dosage form of furosemide for controlled release

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Acta Pharmaceutica Sinica B 2012年第5期2卷 509-517页

作者： Sharad S.Darandale Pradeep R.Vavia Department of Pharmaceutical Sciences and Technology Institute of Chemical TechnologyMumbai 400019India

The aim of the present study was to develop and characterize a gastroretentive dosage form suitable for controlled drug release.It consists of a drug loaded polymeric film made up of a bilayer of immediate(IR)and controlled release(CR)layers folded into a hard gelatin capsule.Gast roretention results from unfolding and swelling of the film and its bioadhesion to the gastric.mucosa.Furosemide,a drug with a narrow absorption window,was selected as the model drug.Inclusion of hydroxypropyl β-cyclodextrin in both layers and Carbopol■ 971P NF in the CR layer of the bilayer film resulted in optimum drug release,bioadhesion and mechanical properties.The film with zig-zag folding in the capsule was shown to unfold and swell under acidic conditions and provide IR of drugover 1 hand CR for up to 12 h in acidic medium.X-ray diffraction,differential scanning calorimetry and scanning electron microscopy revealed uniform dispersion of furosemide in the polymeric matrices.The results indicate the dosage form is gastroretentive and can provide controlled release of drugs with narrow therapeutic wind ows.

关键词： Gastroretentive dosage form Controlled release Furosemide Bioadhesion bilayer film Hydroxypropylβ-cyclodextrin Carbopol

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