chin whiskers
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The results indicate that only tungsten oxide grains are formed without sodium sulfate additions, while tungsten oxide whiskers with 0.20.3 μm in diameter and aspect ratio of 5-50 or tungsten oxide nanowires with 1030 nm in diameter and aspect ratio of 50200 are synthesized by some sodium sulfate additions on conditions at 180 ℃ for 1236 h. The phase composition of tungsten oxide whiskers is hexagonal tungsten trioxide. The whiskers/nanowires grow oriently through 〈200〉,〈002〉,〈202〉and〈100〉.
结果表明:未添加硫酸钠时,在180 ℃水热反应12~36 h只能得到氧化钨颗粒粉末,而添加适量硫化钠后,可制备出直径为0.2~0.3 μm、长径比为5~50的氧化钨晶须和直径为10~30 nm、长径比为50~200的氧化钨纳米线;氧化钨纳米线晶体结构良好,物相为六方晶系WO3;微/纳米氧化钨晶须/线主要沿〈200〉,〈002〉,〈202〉和〈100〉方向定向生长。
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Fracture behavior study showed that, reinforced of SiC or Si〓N〓 nanoparticles, or SiC whiskers is due to cracks deflection, or twist, or diverse, or stop during propagating, and bridging and pulling-out of whiskers, and accompanied by fracture of a few SiC nanoparticles and whiskers.
断裂机理研究表明:裂纹扩展过程中遇到纳米SiC晶粒、纳米Si〓N〓晶粒和SiC晶须时,将发生偏转、扭曲、分叉、终止及晶须的桥接、拔出,并有少量SiC晶粒、Si〓N〓晶粒和SiC晶须断裂。
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The results show that the growth rate of tetrapod ZnO is controlled by spiral growth and its crystallization is via VLS model. The condensation of tiny zinc droplets in zinc vapor is the key factor of the formation of tetrapod ZnO. The growth steps are formed on the terminated faces as zinc diffuses outwards and the elongation of whiskers continues until zinc inside the droplets is depleted. VS crystallization, which has little effect on the elongation growth, takes place on side faces of the whiskers and consequently makes the whiskers radius increase.
结果表明: T-ZnO晶须的结晶作用是气-液-固方式,晶须生长受螺旋生长机理控制;锌蒸气中产生凝聚生长的锌液滴是制备T-ZnO晶须的关键,锌从液滴内向外扩散在晶须的端面产生生长台阶,随着液滴内的原子向外不断扩散,针体部分就不断地伸长生长,当液滴内的原子全部消耗尽时,晶须便不再发生轴向生长;气-固方式的作用主要是促进晶须棱面生长而使晶须变粗,对轴向生长几乎没有影响。
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chin-chin:请请
!chin-chin 你好 | !chin-chin 请请 | !chin-chin 祝君健康
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chin-chin:你好
!bravo 好啊 | !chin-chin 你好 | !chin-chin 请请
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chin-chin hardening:激冷,冷模,冷铁
chin reflex 颏反射 | chin-chin hardening 激冷,冷模,冷铁 | chin-neck projection 颏-颈突度