Materials Literature
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以Yb2O3、Y2O3、Gd2O3稀土氧化物粉末和ZrOCl2.8H2O粉末为原料,采用化学共沉淀法制备了Yb2O3-Y2O3-Gd2O3-ZrO2（YYGZO）热喷涂用粉末,采用大气等离子喷涂技术制备了YYGZO涂层,利用场发射扫描电镜（FESEM）、X射线衍射（XRD）研究了YYGZO粉末及涂层的微观组织形貌、相结构。结果表明,制备的热喷涂YYGZO粉末大部分呈规则实心球体状,且球形度良好,颗粒粒径均匀,大部分颗粒粒径分布为30～60μm,流动性能较好,满足大气等离子喷涂的要求。YYGZO涂层具有较好的高温相结构稳定性。所制备YYGZO热障涂层组织结构比较致密,涂层各个界面结合紧密,孔隙率约为9.23%,结合强度为35.2 M…
Nanosuspension was usually investigated and developed to apply as the delivery system of sparingly water soluble drug. With its very small particle size and high surface free energy, nanosuspension has physical instability such as sedimentation, agglomeration, crystal growth and change of crystalline stage that could…
Solar energy is capturing the spotlight as clean energy replaced with atomic energy. Then, we paid attention to the thin film silicon solar cell with low manufacture cost. It is usually manufactured by PECVD under low back pressure. We found that high-speed film deposition was enabled by increasing back pressure. Howe…
将纳米氧化锌（nano-ZnO）作为协效改性剂与膨胀阻燃剂（IFR）复配,制成IFR/nano-ZnO复合阻燃剂,并将其用于三元乙丙橡胶/聚丙烯（EPDM/PP）复合材料的阻燃。研究了nano-ZnO用量对该EPDM/PP/IFR/nano-ZnO阻燃复合材料的阻燃性能和力学性能的影响。结果表明：EPDM/PP/IFR/nano-ZnO阻燃复合材料具有优良的阻燃性能,且材料的力学性能明显改善;另外,当nano-ZnO用量为2%时,该阻燃复合材料的综合性能最佳。
以新型Co基合金Co-9Al-9W-2Ta为基础,分别用4at%、6at%和9at%的Nb元素替代等量的W（分别称4Nb、6Nb、9Nb合金,无Nb添加的称为0Nb合金）,研究Nb含量对合金显微组织和高低温力学性能的影响。结果表明：铸态组织由Co基固溶体γ相和γ＋Co3Nb共晶组成（Nb可部分被W和/或Ta取代）,随Nb含量提高,共晶组织体积分数增大。1200℃/8h固溶＋800℃/100h时效处理后,γ中析出尺寸为数百纳米并与之共格的γ’-Co3（Al,W）相或Co3Nb相,显微组织由γ/γ’组织（0Nb）逐步向γ/γ’/Co3Nb组织（4Nb和6Nb合金）和γ/Co3Nb组织转变（9Nb合金）。合金在600℃开始出现反常屈服,…
This work has as main goal to develop the technique of deposition for plasma in discharge of cathodic cage. Deposition of layers the iron nitride and titanium nitride were realized on sample of glass in cathodic cage, under varying conditions of temperature, time of treatment and rate mixture of H 2 -N 2 . The charact…
用改进的溶胶-凝胶法(sol-gel)在Pt/Ti/SiO2/Si(S)上制备了各层Y掺杂浓度分别为0.5%/0.6%/0.7%/0.8%/0.9%/1%的上梯度掺杂和1%/0.9%/0.8%/0.7%/0.6%/0.5%下梯度掺杂的Ba0.6Sr0.4TiO3薄膜。X射线衍射(XRD)表明,各薄膜主要沿(110)晶面生长,均为立方钙钛矿结构。相比均匀掺杂薄膜,梯度掺杂薄膜表现出较好的相结构衍射强度及晶化,上梯度薄膜更为显著。原子力显微镜(AFM)表明,梯度掺杂使薄膜的表面形貌得到极大改善,上梯度比下梯度薄膜具有更加光滑致密的表面相貌和更小的表面粗糙度。电压-电容曲线表明,上梯度薄膜介电性能得到明显提高,在零偏压下的电容为28.5…
使用RF-PECVD法分别在基底温度为60℃、120℃和200℃的N型单晶锗表面制备了α-C：H膜,采用拉曼光谱、傅里叶变换红外吸收光谱和原子力显微镜等技术手段研究分析了α-C：H膜的价键组成及表面形貌,讨论了基底温度对α-C：H膜微结构及部分性能的影响。结果表明,在α-C：H膜沉积过程中,基底温度对膜层微观结构有较大影响,基底温度60℃时,膜层表面光滑、致密无石墨化现象。随着基底温度的升高,α-C：H膜中含H量和微晶石墨量逐渐增多,α-C：H膜层性能也逐步退化。
利用微波辅助有机溶胶法成功制备了Pd3Ru／C纳米电催化剂。相比传统的高压有机溶胶法，该法大大降低了有机溶剂的使用量并缩减了反应时间，是一种环境友好和资源节约的新型方法。采用xRD，TEM，XPS和电化学测试等手段对其结构和电化学性能进行了表征和评价。XRD和TEM结果表明微波辅助制备的Pd3Ru／C催化剂其粒径只有约3．0nm，分散性也较Pd／C得到显著改善；XPS谱图证实催化剂活性组分Pd和Ru的原子比约为3．13：1，Pd和Ru两种元素间发生了相互作用。与同条件制备的Pd／C催化剂相比，Pd3Ru／C催化剂在电极上发生甲酸氧化反应的主要峰电位负移了约100mV，峰电流密度增大了2／3左右，其甲酸电氧化活性得到明显提高。
采用浸渍法制备了H3 PW12O40/ZrO2-WO3催化剂,并通过FT-IR,XRD对其进行了表征.以H3 PW12O40/ZrO2-WO3为催化剂催化合成环己酮1,2-丙二醇缩酮,研究了各种因素对收率的影响.结果表明：固定环己酮用量为0.20 mol,在n（环己酮）∶n（1,2-丙二醇）=1∶1.4,反应时间30 min,带水剂环己烷的用量为10 mL,催化剂的用量占反应物总质量的0.8％的优化条件下,环己酮1,2-丙二醇缩酮的收率可达88.9％.
Organic semiconducting materials entice interest due to current and potential applications in electronic devices such as organic field effect transistors (OFETs).Air stable sulfur-hetero oligoarenes based on the benzo[k]fluoranthene unit have been developed for potential use in OFETs.Research has been conducted on a p…
The interest in self‐assembly of magnetically dipolar colloids has been driven both fundamentally and practically. Colloidal dipolar spheres are interesting model systems in condensed‐matter physics as they can self‐assemble into various crystals structures that allow exploration of the phase complexity in a single sa…
A laser scanning confocal microscope(LSCM) and a field-emission scanning electron microscope(FESEM) were used to study the defects in CdMnTe crystals,such as twin boundaries,Te inclusions,and dislocations. Twin boundaries were usually decorated with Te inclusions,which could induce dislocations.The optical,electrical…
Monte Carlo simulations have been performed to study the phase diagram of liquid crystals formed by V-shaped molecules with an electric dipole moment. Simulation results show that as the electric dipole moment in- creases, the Landau point where phase transits directly from the isotropic to the biaxial nematic occurs…
在Ti6A14V合金微弧氧化膜表面制备Ni-P-ZrO2化学复合镀层，微弧氧化处理时间分别为15、30、60、90min。采用扫描电镜／能谱仪、划痕试验、热震试验、显微硬度计和球盘式摩擦磨损试验机研究了微弧氧化膜结构对Ni-P-ZrO2化学复合镀层的结合性能与摩擦性能的影响。结果表明：随着微弧氧化时间的增加，复合镀层的结合性能显著提高，原因是微弧氧化膜的多孔性结构及其机械锁合效应。与Ti6A14V合金相比，微弧氧化＋化学复合镀处理后的试样硬度和耐磨性显著提高，Ti6A14V合金表现为是严重的黏着磨损，而Ni-P-ZrO2复合镀层以磨砺磨损为主。
Whilst high Na is known to be detrimental to plant growth and K nutrition, low to moderate Na can be beneficial to plant growth especially when soil available K is deficient, since Na can substitute for specific biophysical functions of K. Potassium deficiency are common in agricultural soils but the role of Na in K n…
We demonstrate a submillisecond-response tunable-focus cylindrical microlens array based on polymer network liquid crystal. The focal length can be tuned from 1.9 cm to 5 cm by increasing the voltage from 0 to 80V. This microlens array has potential applications in autostereoscopic 3D displays. © 2013 Society for Info…
нулю. Ток АБ также равен нулю, и заряда АБ не про-исходит. Начиная с момента времени t1 СБ начинает генерировать мощность. С ростом мощности СБ рас-тет ток заряда АБ. На интервале времени [t1÷t2] сис-тема работает в режиме экстремального регулирова-ния. В момент времени t2 ток заряда АБ достигает задаваемого уровня ог…
系统研究了（VFe）48Ti26Cr26-xMox（0≤x≤5）合金吸放氢性能及微观组织结构。XRD及PCT测试结果表明，随着Mo含量增加，合金的晶格常数增大，放氢平台压升高，吸放氢量在Mo含量0≤x≤2范围内不出现显著变化，且有效放氢量（质量分数）均能保持在2%以上。当Mo含量为1 at%时，合金吸放氢量均达到最大值，吸氢量为3.59%，放氢量为2.08%，室温下的放氢平台压为0.337 MPa。SEM与EDS分析表明，不同Mo含量的合金均由bcc主相、Laves相及稀土氧化物相组成，且Mo主要存在于合金的bcc主相中，而在Laves相中分布相对较少。
以膨润土为载体，用溶胶-凝胶法制备了不同焙烧温度的Cu—Fe双金属掺杂的TiOz／膨润土复合光催化剂，采用XRD、TG—DSC和N。吸附技术对其结构进行了表征，通过光催化降解直接天蓝染料废水，考察了焙烧温度对催化剂光催化性能的影响。结果表明，当焙烧温度高于300℃时，催化剂中出现了锐钛矿型TiO2，杂的cu2＋Fe3＋能进入了TiOz晶格取代了部分Ti4＋使其晶格产生了一定程度的畸变，形成了复合半导体，拓宽了TiO2的光谱响应范围，并且Cu抖、Fe什掺杂的TiOz复合半导体进入了蒙脱石层间，与膨润土成功复合，增大了催化剂的比表面积并改善了催化剂的孔体积，提高了光催化剂活性和再生性。