分类： 物理学 >> 普通物理:统计和量子力学,量子信息等 提交时间： 2017-05-02
Lu, W [Lu, Wei][ 1,2 ]
Xiao, P [Xiao, Peng][ 1 ]
Gu, JC [Gu, Jincui][ 1 ]
Zhang, JW [Zhang, Jiawei][ 1 ]
Huang, YJ [Huang, Youju][ 1 ]
Huang, Q [Huang, Qing][ 1 ]
Chen, T [Chen, Tao][ 1 ]
摘要： A polymer-based visible and quantitative fluorometric assay for CO2 gas is constructed using branched polyethyleneimine (PEI) covalently modified with tetraphenylethylene (TPE). The sensing mechanism relies on the reaction of CO2 with alkylamines of PEI to induce the “solution-to-precipitation” phase transi- tion of the sensory polymer (TPE–PEI), thus resulting in strong aggregation-induced fluorescent emission of TPE–PEI. It works in a relatively environmental benign ethanol medium and avoids the use of toxic amine compounds with unpleasant odor. More importantly, this system is proved to be highly tolerant to possibly coexisting water, carbon monoxide, acid SO2 and H2 S gases as well as many common volatile organic compounds. These characteristics make the presently developed fluorescent chemosensor hold great potential for many real-world applications.
分类： 物理学 >> 普通物理:统计和量子力学,量子信息等 提交时间： 2017-05-02
Shen, L [Shen, Lu][ 1 ]
Xue, JM [Xue, Jianming][ 2 ]
Barsoum, MW [Barsoum, Michel W.][ 3 ]
Huang, Q [Huang, Qing][ 1 ]
摘要： Inspired by pressure resistance welding of metallic materials, herein we describe how two MAX phases—Ti3SiC2 and Ti3AlC2—were successfully joined by a rapid electric current heating method in a pulsed electric current sintering furnace. No welding agent was employed and the total processing time was less than 6 min. When the bulk temperature of the joint couple exceeded 1070°C, good joints, with shear strength above 50 MPa, were achieved in both homo- and heterojunction joints.
提交时间： 2017-05-02
Chen, K [Chen, Ke][ 1 ]
Ye, Q [Ye, Qun][ 1 ]
Zhou, J [Zhou, Jie][ 1 ]
Shen, L [Shen, Lu][ 1 ]
Xue, JM [Xue, Jianming][ 2 ]
Huang, Q [Huang, Qing][ 1 ]
摘要： This study reports a viable method for the synthesis of Ti2SC phase using iron disulfide or iron sulfide as sulfur source and a post-treatment with acid. The reaction routes to Ti2SC phases starting from two different chemical compositions of 2Ti-FeS2-2Ti
分类： 物理学 >> 普通物理:统计和量子力学,量子信息等 提交时间： 2017-05-02
Chen, FY [Chen, Fanyan][ 1 ]
Ying, JM [Ying, Jiamin][ 1 ]
Wang, YF [Wang, Yifei][ 1 ]
Du, SY [Du, Shiyu][ 1 ]
Liu, ZP [Liu, Zhaoping][ 2 ]
Huang, Q [Huang, Qing][ 1 ]
摘要： Copper matrix composites reinforced with graphene nanoplatelets (GNPs) were prepared via molecular- level mixing process and spark plasma sintering process. The impacts of graphene content on micro- structure, mechanical performance, thermal diffusivity, electrical conductivity and tribological properties of the composites were investigated. For microstructure, GNPs distributed randomly in composites with low graphene concentration (no more than 0.8 vol.%), but aligned in the direction perpendicular to the consolidation force when graphene concentration was above 2.0 vol.%. The mechanical performance of copper was strengthened evidently by the graphene addition. However, the strengthen effects were firstly enhanced and then deteriorated by increasing graphene content. Thermal diffusivity showed a constant decrease with the increase of graphene content. Anisotropy thermal performance was obtained by composites with graphene alignment. Furthermore, graphene addition showed little negative impact on electrical conductivity but dramatically improved tribological performance.
分类： 物理学 >> 普通物理:统计和量子力学,量子信息等 提交时间： 2017-05-02
Ding, ZH [Ding, Zhihui][ 1 ]
Deng, QH [Deng, Qihuang][ 1 ]
Shi, DW [Shi, Diwei][ 1 ]
Zhou, XB [Zhou, Xiaobing][ 1 ]
Li, Y [Li, Yong][ 1 ]
Ran, SL [Ran, Songlin][ 2 ]
Huang, Q [Huang, Qing][ 1 ]
摘要： Hexagonal Columnar ZrB2 powders were obtained from irreg- ular commercial powder at low temperature using microwave heating technique. It was confirmed that the raw ZrB2 powders first underwent dissolution process in the glassy coating, fol- lowed by re-crystallization. A growth mechanism involving selective attachment is proposed to explain the formation of the hexagonal tubules.
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