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81.
Yongqiang Dong Qingqing Fang Huan Wu Lisi Wan Yuhong Lin Chun‐Hua Lu Yuwu Chi Huang‐Hao Yang 《Particle & Particle Systems Characterization》2016,33(12):916-923
Fullerene‐structural carbon‐based dots (f‐CDs) are synthesized for the first time by chemically oxidizing fullerene molecules (C60) using concentrated HNO3. The lateral sizes of the f‐CDs distribute in the range of 7–20 nm, and the heights mainly range from 0.4 to 1.3 nm with an average value of 0.7 nm. The presence of massive pentagonal carbon units makes the f‐CDs different from most of graphitic‐CDs in structure and morphology. The f‐CDs exhibit unique luminescent properties such as photoluminescence (PL) and electrochemiluminescence. Based on the investigation of the UV–vis absorption and luminescent properties, a novel and reasonable model is proposed for the PL mechanism of f‐CDs. Furthermore, the obtained f‐CDs show low cytotoxicity and have potential application in cell imaging. 相似文献
82.
Protein detection and quantitation by tetraphenylethene-based fluorescent probes with aggregation-induced emission characteristics 总被引:2,自引:0,他引:2
Tong H Hong Y Dong Y Häussler M Li Z Lam JW Dong Y Sung HH Williams ID Tang BZ 《The journal of physical chemistry. B》2007,111(40):11817-11823
Three functionalized derivatives of tetraphenylethylene (TPE), namely, 1,2-bis(4-methoxyphenyl)-1,2-diphenylethene (1), 1,2-bis(4-hydroxyphenyl)-1,2-diphenylethene (2), and 1,2-bis[4-(3-sulfonatopropoxyl)phenyl]-1,2-diphenylethene sodium salt (3), were synthesized and their fluorescence properties were investigated. All the TPE molecules are nonluminescent in the solution state but are induced to emit efficiently by aggregate formation. This novel process of aggregation-induced emission (AIE) is rationalized to be caused by the restriction of intramolecular rotations of the dye molecules in the aggregate state. The possibility of utilizing the AIE effect for protein detection and quantification is explored using bovine serum albumin (BSA) as a model protein, with salt 3 being found to perform as a stable, sensitive, and selective bioprobe. 相似文献
83.
84.
Fluorescence enhancements of benzene-cored luminophors by restricted intramolecular rotations: AIE and AIEE effects 总被引:3,自引:0,他引:3
Zeng Q Li Z Dong Y Di C Qin A Hong Y Ji L Zhu Z Jim CK Yu G Li Q Li Z Liu Y Qin J Tang BZ 《Chemical communications (Cambridge, England)》2007,(1):70-72
Photoluminescence of simple arylbenzenes with ready synthetic accessibility is enhanced by two orders of magnitude through aggregate formation; viscosity and temperature effects indicate that the emission enhancement is due to the restriction of their intramolecular rotations in the solid state. 相似文献
85.
Dong Y Lam JW Qin A Li Z Sun J Sung HH Williams ID Tang BZ 《Chemical communications (Cambridge, England)》2007,(1):40-42
(4-Biphenylyl)phenyldibenzofulvene is weakly luminescent in the amorphous phase but becomes highly emissive upon crystallization; this unusual crystallization-induced emission enhancement effect allows its emission to be repeatedly switched between dark and bright states by fuming-heating and heating-cooling processes. 相似文献
86.
We have recently reported a novel rearrangement reaction involving an intramolecular metathesis between M-M and Fe-Fe bonds in the dinuclear iron complexes (Me2MMMe2)[η5-C5R4)Fe(CO)]2(μ-CO)2 (M=Si, Ge; R=H, Me):[1-5].In order to extend the applied range of the rearrangement reaction we tried to synthesize the digermyl briged diruthenium analogues. The results showed a great difference between them. 相似文献
87.
提出一种既不是利用振幅加减,又不是利用强度加减,而且也不同于一般利用互补色进行图象相减的新方法,获得了图象间差异信息的假彩色输出。 相似文献
88.
研制出30个单元的InGAaSp/InGaP/GaAs分别限制双异质结单量子阱激光器列阵,器件外微分量子效率达78%,发向波长808nm,准连续输出的光功率达27W。 相似文献
89.
三维非均匀脆性材料破坏过程的数值模拟 总被引:32,自引:1,他引:32
采用有限元方法模拟了三维均匀固体材料在宏观等效力学性质和破坏过程。首先采用格形(lattice)方法把试件离散成三维均匀网格,在每个单元格中将材料按照均匀处理,根据给定的统计规则来确定不同单元格中的材料常数以反映材料的非均匀性。然后对非均匀脆性材料选用简单的本构关系与断裂准则,采用自适应选取载荷步长对试件进行加载,通过非平衡迭代技术对刚度矩阵进行不断修正,实现了非均匀脆性材料的弹性行为及破坏过程的数值模拟。在此基础上,通过数值计算研究了材料的非均匀分布对宏观等效力学性质和破坏过程的影响,给出了破坏全过程的非线性载荷-位移曲线以及不同载荷阶段的三维损伤破坏的演化图。 相似文献
90.