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991.
Dong Wu Si‐Zhu Wu Shuai Zhao Jia Yao Jiang‐Nan Wang Qi‐Dai Chen Hong‐Bo Sun 《Small (Weinheim an der Bergstrasse, Germany)》2013,9(5):760-767
A simple strategy to realize new controllable 3D microstructures and a novel method to reversibly trapping and releasing microparticles are reported. This technique controls the height, shape, width, and arrangement of pillar arrays and realizes a series of special microstructures from 2‐pillar‐cell to 12 cell arrays, S‐shape, chain‐shape and triangle 3‐cell arrays by a combined top down/bottom up method: laser interference lithography and capillary force‐induced assembly. Due to the inherent features of this method, the whole time is less than 3 min and the fabricated area determined by the size of the laser beam can reach as much as 1 cm2, which shows this method is very simple, rapid, and high‐throughput. It is further demonstrated that the ‘mechanical hand’‐like 4‐cell arrays could be used to selectively trap/release microparticles with different sizes, e.g., 1.5, 2, or 3.5 μm, which are controlled by the period of the microstructures from 2.5 to 4 μm, and 6 μm. Finally, the ‘mechanical hand’‐like 4‐cell arrays are integrated into 100 μm‐width microfluidic channels prepared by ultraviolet photolithography, which shows that this technique is compatible with conventional microfabrication methods for on‐chip applications. 相似文献
992.
Pb(Zn1/3Nb2/3)O3 ceramics with the perovskite structure can be stabilized by substituting 6–7 mol % BaTiO3 (BT). Piezoelectric and dielectric properties of the pseudo-binary system (1–x)(0.94PZN-0.06BT) -xPb(Zr(1–y)Tiy)O3 were studied, and the effects of Zr/Ti ratios and thermal annealing process on the piezoelectric and dielectric properties were also discussed. The results show that the piezoelectric properties of this ceramic system are very good when x is about 0.50 and y is about 0.47 with Kp = 70%, d33=560 pC/N, m #x2248;23,000. These ceramics are favorable to piezoelectric actuators. 相似文献
993.
To improve oxidation resistance of carbon/carbon (C/C) composites, a SiC/SiC-MoSi2-ZrB2 double-layer ceramic coating was prepared on C/C composites by two-step pack cementation. The phase compositions and microstructures of as-prepared multilayer coating were characterized by X-ray diffraction and scanning electron microscopy. The oxidation resistance at 1773 K and the effect of thermal shock between 1773 K and room temperature on mechanical performance of coated specimens were investigated. The results show that the SiC/SiC-MoSi2-ZrB2 coating exhibits dense structure and is composed of SiC, Si, MoSi2 and ZrB2. It can protect C/C composites from oxidation at 1773 K for more than 510 h with weight loss of 0.5%. The excellent anti-oxidation performance of the coating is due to the formation of SiO2-ZrSiO4 complex glassy film. The coating can also endure the thermal shocks between 1773 K and room temperature for 20 times with residual flexural strength of 86.1%. 相似文献
994.
995.
0 引言 在ISO/IEC 17025:1999中5.9及ISO/IEC导则25中5.6章节,均描述了几种方法作为检测结果的质量保证和质量控制的手段,但在实践中,有不少检测机构仅在<质量手册>中作为"要素"加以描述,在监控计划及具体实施中还不到位,本文就此问题加以阐述,以期对"检测结果质量保证"做到说到就做到,做到就做好. 相似文献
996.
997.
998.
Jingwu Zheng Feifan Song Shenglei Che Wangchang Li Yao Ying Jing Yu Liang Qiao 《Advanced Powder Technology》2018,29(6):1474-1480
In the present work, the porous hollow carbon spheres loaded with NiFe2O4 nanoparticles have been successfully prepared via ultrasonic spray pyrolysis technique at 700?°C and the associated formation mechanism has been studied. The as-prepared NiFe2O4/carbon microspheres with the diameter of about 3–5?µm and the specific surface area of 236.6889?m2?g?1 exhibit good monodispersity and an abundance of mesopores of about 40?nm size. Notably, the 20?nm NiFe2O4 nanoparticles are encapsulated by carbon microspheres and disperse homogeneously inside the carbon matrix. We could tune the relative content of ferrite and carbon sphere via adjusting the composition of the solution used for synthesis and the carbonization temperature. Consequently, some interesting properties can be obtained by combining the magnetic NiFe2O4 nano powder and the electrically conductive porous carbon, which renders the resulting composite suitable for promising applications in electromagnetic wave absorption, treatment of polluted water, catalyst design, energy storage, batteries and so on. 相似文献
999.
High‐Brightness Blue and White LEDs based on Inorganic Perovskite Nanocrystals and their Composites
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En‐Ping Yao Zhanlue Yang Lei Meng Pengyu Sun Shiqi Dong Ye Yang Yang Yang 《Advanced materials (Deerfield Beach, Fla.)》2017,29(23)
Inorganic metal halide perovskite nanocrystals (NCs) have been employed universally in light‐emitting applications during the past two years. Here, blue‐emission (≈470 nm) Cs‐based perovskite NCs are derived by directly mixing synthesized bromide and chloride nanocrystals with a weight ratio of 2:1. High‐brightness blue perovskite light‐emitting diodes (PeLEDs) are obtained by controlling the grain size of the perovskite films. Moreover, a white PeLED is demonstrated for the first time by blending orange polymer materials with the blue perovskite nanocrystals as the active layer. Exciton transfer from the blue nanocrystals to the orange polymers via Förster or Dexter energy transfer is analyzed through time resolved photoluminescence. By tuning the ratio between the perovskite nanocrystals and polymers, pure white light is achieved with the a CIE coordinate at (0.33,0.34). 相似文献
1000.
Qiang Zhu Ping Yao Changwen Dong Leilei Wang Gongchun Heng 《Materials and Manufacturing Processes》2015,30(9):1124-1130
A new welding method, which uses a Gaussian current waveform with a smooth curve and concentrated energy input, was applied for welding of aluminum alloys of various thickness. Current peak modulation and base modulation models are proposed in the article. Five welding experiments were carried out using ER4043 1.2 mm aluminum wire, the results showing that the welding process was found to be stable, and that current and voltage waveforms were regular with no broken arcs or short circuits. Moreover, the arc voice sound was soft with low splatter. Weld seam surfaces were bright with regular scaly stripes and proper weld height and penetration. 相似文献