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STUDY ON STRUCTURE AND PROPERTY OF Nb-DOPED TiC CERAMIC WITH QUANTUM CHEMISTRY CALCULATIONS
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作者 闵新民 蔡克峰 +1 位作者 南策文 袁润章 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 1994年第4期63-71,共9页
Nb-doped TiC ceramic,or (NbyTi1-y) Cx,in which amount of Nb element added is increased from zero to 40Wt. %, synthisized -with self-propagating high temperature synthesis,is studied with SCF-Xa-DV,a quantum chemistry ... Nb-doped TiC ceramic,or (NbyTi1-y) Cx,in which amount of Nb element added is increased from zero to 40Wt. %, synthisized -with self-propagating high temperature synthesis,is studied with SCF-Xa-DV,a quantum chemistry cal-culating method. The chemical bonding is studied to discuss the relation between structrues and properties. Several classes of models in which there is no vacancy,one vacancy or two vacan-cies have been calculated. From the calculated results of bond or-der, a measure of covalent bond strength,and molecule orbital contour map, it is concluded that when Nb element added in-creases, the vacancies increase correspondingly,the covalent com-ponent of chemical bonds of the samples decreases -while the met-al-bonding component increases, so the hardness and resistance of the samples decrease. 展开更多
关键词 TiC ceramic structure and property quan- tum chemistry
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裸鼠近红外肿瘤体内转移模型的建立
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作者 汤锋 嘎琴 +2 位作者 李润乐 格日力 奚涛 《青海医学院学报》 CAS 2013年第4期249-254,共6页
目的建立以近红外探针FA-OCC-QDs介导的裸鼠近红外体内肿瘤转移模型。方法通过化学修饰壳聚糖并包裹量子点制备具有近红外光学活性的肿瘤靶向探针FA-OCC-QDs,并结合荧光倒置显微镜、MTT法考察FA-OCC-QDs的体外肿瘤靶向性及细胞毒性,继... 目的建立以近红外探针FA-OCC-QDs介导的裸鼠近红外体内肿瘤转移模型。方法通过化学修饰壳聚糖并包裹量子点制备具有近红外光学活性的肿瘤靶向探针FA-OCC-QDs,并结合荧光倒置显微镜、MTT法考察FA-OCC-QDs的体外肿瘤靶向性及细胞毒性,继而结合近红外成像裸鼠肿瘤转移模型、病理切片等技术研究该探针肿瘤体内靶向性。结果 FA-OCC-QDs无明显的细胞毒性(IC50=0.1368),并且具有很好的肿瘤靶向性。本研究所建FA-OCC-QDs近红外检测技术可以准确检测到体内微小的肿瘤转移灶。结论 FA-OCC-QDs可以准确诊断肿瘤转移的发生并且FA-OCC-QDs近红外成像模型的灵敏度显著高于病理切片,本研究建立了一种简单、快速、准确、实时的裸鼠活体诊断肿瘤转移的模型,该模型可能为肿瘤转移的机制研究及抗肿瘤转移药物的研发提供有利的工具。 展开更多
关键词 裸鼠 肿瘤转移 壳聚糖衍生物 靶向诊断 近红外成像 量子点
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新型复合纳米材料用于光催化降解染料废水的研究进展 被引量:12
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作者 张铭泰 余少彬 +4 位作者 李希成 冯萃敏 石梦童 汪长征 王强 《材料工程》 EI CAS CSCD 北大核心 2022年第7期59-68,共10页
光催化技术是解决当今人类社会中环境问题和能源危机两大问题的有效途径,半导体材料在早期的研究中备受青睐。然而,单一半导体光催化剂存在可见光响应程度差、电子空穴对易复合等缺点,光催化技术在降解染料废水的应用中有效率较低,因此... 光催化技术是解决当今人类社会中环境问题和能源危机两大问题的有效途径,半导体材料在早期的研究中备受青睐。然而,单一半导体光催化剂存在可见光响应程度差、电子空穴对易复合等缺点,光催化技术在降解染料废水的应用中有效率较低,因此研究者对新型复合纳米材料作为光催化剂降解染料废水进行了深入的研究。本文介绍了石墨烯、金属有机骨架、碳量子点三种新型复合纳米材料用于光催化降解染料废水中污染物的研究进展和主要研究结果,按照复合纳米材料设计升级的思路,简述了部分新型复合纳米材料的制备方法,对目标污染物的降解率进行了分析。通过总结新型光催化材料降解水中污染物的性能,对未来发展趋势进行了展望,指出新型复合纳米材料在光催化方向今后的发展趋势和研究重点是有针对性的处理废水,并实现工业化。 展开更多
关键词 光催化 复合纳米材料 石墨烯 金属有机骨架 碳量子点
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Interfacial polaron in quantum dots and luminescent porous silicon 被引量:2
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作者 Bingsuo Zou Sishen Xie 《Chinese Science Bulletin》 SCIE EI CAS 2001年第8期630-635,共6页
Polaronic effect is important in the current researches on quantum dots (QD). This paper reported a new concept of the 'confined polaron', their size dependent formation possibilities and energy variation in d... Polaronic effect is important in the current researches on quantum dots (QD). This paper reported a new concept of the 'confined polaron', their size dependent formation possibilities and energy variation in different QD systems, with an indication of contribution from both intrinsic and/or extrinsic phonons. To understand the spectro-scopic characteristics of porous silicon (PS), we find that luminescence behavior of oxidized porous silicon is in good agreement with the model of interfacial confined polaron in QDs. This conclusion is useful to unveiling the mechanmism of PS luminescence. 展开更多
关键词 porous silicon luminescence INTERFACIAL POLARON quan- tum dots.
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Theoretical study of photon emission from single quantum dot emitter coupled to surface plasmons
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作者 Guang-cun SHAN Shu-ying BAO +1 位作者 Kang ZHANG Wei HUANG 《Frontiers of physics》 SCIE CSCD 2011年第3期313-319,共7页
Motivated by the recent pioneering advances on nanoscale plasmonics and also nanophotonics tech- nology based on the surface plasmons (SPs), in this work, we give a master equation model in the Lindblad form and inv... Motivated by the recent pioneering advances on nanoscale plasmonics and also nanophotonics tech- nology based on the surface plasmons (SPs), in this work, we give a master equation model in the Lindblad form and investigate the quantum optical properties of single quantum dot (QD) emitter coupled to the SPs of a metallic nanowire. Our main results demonstrate the QD luminescence results of photon emission show three distinctive regimes depending on the distance between QD and metallic nanowire, which elucidates a crossover passing from being metallic dissipative for much smaller emitter-nanowire distances to surface plasmon (SP) emission for larger separations at the vicinity of plasmonic metallic nanowire. Besides, our results also indicate that, for both the resonant case and the detuning case, through measuring QD emitter luminescence spectra and second-order correlation functions, the information about the QD emitter coupling to the SPs of the dissipative metallic nanowire can be extracted. This theoretical study will serve as an introduction to un- derstanding the nanoplasmonic imaging spectroscopy and pave a new way to realize the quantum information devices. 展开更多
关键词 quantum plasmonics quantum optics metallic nanowire surface plasmon (SP) quan-tum dot
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新型纳米粒载体在药物或基因传递中的应用 被引量:3
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作者 陈孝储 郭一沙 +1 位作者 严子平 张莉 《中国药学杂志》 CAS CSCD 北大核心 2013年第21期1797-1803,共7页
目的重点总结近几年出现的新型纳米粒载体在药物或基因传递中的应用。方法分析、归纳、总结国内外相关文献,对新型的纳米粒载体如纳米脂质卷、病毒样纳米粒、水凝胶纳米粒、金纳米壳、碳纳米材料、量子点和树状大分子等的特征、体内外... 目的重点总结近几年出现的新型纳米粒载体在药物或基因传递中的应用。方法分析、归纳、总结国内外相关文献,对新型的纳米粒载体如纳米脂质卷、病毒样纳米粒、水凝胶纳米粒、金纳米壳、碳纳米材料、量子点和树状大分子等的特征、体内外性质以及在药学中的应用进行阐述。结果与结论纳米粒具有特殊的理化性质,可以增加药物稳定性,提高药物生物利用度,具有靶向、缓控释作用等。有望成为药物递送、靶向、诊断和基因转染等的理想载体。 展开更多
关键词 纳米粒 纳米脂质卷 病毒样纳米粒 水凝胶纳米粒 金纳米壳 碳纳米材料 量子点 树状大分子
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