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Influences of pouring temperature and cooling rate on microstructure and mechanical properties of casting Al-Si-Cu aluminum alloy

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Acta Metallurgica Sinica(English Letters) 2012年第4期25卷 272-278页

作者： Xiaowu HU fanrong ai Hong YAN School of Mechanical Electrical Engineering Nanchang UniversityNanchang 330031China

This paper investigated the influences of pouring temperature and cooling rate on the microstructure development and mechanical properties for casting A1-Si-Cu aluminum alloy. The microstructure of the as-cast samples was characterized by an optical microscope. The results showed that the dendrite arm spacing （DAS,）,） is well refined by pouring at a higher temperature. The A decreases with increasing pouring temperature due to the multiplication of the nucleation sites in the superheating liquid melt, and the mechanical properties, such as microhardness and ultimate tensile strength increase correspondingly, while the elongation decreases. The relationships between microhardness and 3, for the samples cooled in metal mould and sand mould, are given as HV：l18.9 - 1.246A and HV=l15.2- 1.029A, respectively. The effects of the cooling rate controlled by using permanent mould casting and sand mould casing processes （the cooling medium is air and sand, respectively） on the dendrite arm spacing and mechanical properties are similar to the effect of the pouring temperature.

关键词： Pouring temperature Cooling rate Microstructure Aluminumalloy Mechanical property

Research on lamellar structure and micro-hardness of directionally solidified Sn-58Bi eutectic alloy

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China Foundry 2012年第4期9卷 360-365页

作者： Hu Xiaowu Li Ke ai fanrong School of Mechanical&Electrical Engineering Nanchang UniversityNanchang 330031JiangxiChina

In this work,the Sn-58Bi(weight percent) eutectic alloy was directionally solidified at a constant temperature gradient(G = 12 ***-1) with different growth rates using a Bridgman type directional solidification furnace.A lamellar microstructure was observed in the Sn-58Bi *** lamellar spacing and micro-hardness of longitudinal and transversal sections were *** values of lamellar spacing of both longitudinal and transversal sections decrease with an increase in growth *** microhardness increases with an increase in the growth rate and decreases with an increase in the lamellar *** dependence of lamellar spacing on growth rate,and micro-hardness on both growth rate and lamellar spacing were obtained by linear regression *** relationships between the lamellar spacing and growth rate,microhardness and growth rate,and micro-hardness and lamellar spacing for transversal and longitudinal sections of Sn-58Bi eutectic alloy were *** fitted exponent values obtained in this work were compared with the previous similar experimental results and a good agreement was obtained.

关键词： directional solidification eutectic alloy microstructure micro-hardness

Functional groups to modify g-C3N4 for improved photocatalytic activity of hydrogen evolution from water splitting

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Chinese Chemical Letters 2020年第6期31卷 1648-1653页

作者： Fan Yu Laichun Wang Qiuju Xing Dengke Wang Xunheng Jiang Guangchao Li Anmin Zheng fanrong ai Jian-Ping Zou Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle Nanchang Hangkong UniversityNanchang 330063China State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics National Center for Magnetic Resonance in WuhanWuhan Institute of Physics and MathematicsChinese Academy of SciencesWuhan 430071China School of Mechanical&Electronic Engineering Nanchang UniversityNanchang 330031 China

Rational modification by functional groups was regarded as one of efficient methods to improve the photocatalytic performance of graphitic carbon nitride(g-C3 N4).Herein,g-C3 N4 with yellow(Y-GCN)and brown(C-GCN)were prepared by using the fresh urea and the urea kept for five years,respectively,for the first *** results show that the H2 production rate of the C-GCN is 39.06μmol/h,which is about 5 times of the ***,in terms of apparent quantum efficiency(AQ.E)at 420 nm,C-GCN has a value of 6.3%and nearly 7.3 times higher than that of Y-GCN(0.86%).The results of XRD,IR,DRS,and NMR show,different from Y-GCN,a new kind of functional group of—N=CH—was firstly in-situ introduced into the C-GCN,resulting in good visible light absorption,and then markedly improving the photocatalytic *** calculation also confirms the effect of the—N=CH—group band structure of ***,XPS results demonstrate that the existence of—N=CH—groups in C-GCN results in tight interaction between C-GCN and Pt nanoparticles,and then improves the charge separation and photocatalytic *** present work demonstrates a good example of"defect engineering"to modify the intrinsic molecular structure of g-C3N4 and provides a new avenue to enhance the photocatalytic activity of g-C3N4 via facile and environmental-friendly method.

关键词： Functional groups Graphitic carbon nitride Hydrogen evolution Photocatalysis Synthesis

Intrinsically 89Zr-Labeled Gd2O2S:Eu Nanoprobes for in vivo PET And Γ-Ray-Induced Radioluminescence Imaging

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功能材料信息 2016年第4期13卷 57-58页

作者： ai fanrong Zhan Yonghua Weibo Cai Nanchang University Nanchang Jiangxi China Xidian University Xi'an China University of Wisconsin-Madison MADISON WI UNITED STATES

Cerenkov luminescence imaging(CLI)is a non-invasive imaging technique showing immense promise for clinical ***,weak signal intensity and poor tissue penetration depth are two shortcomings that limit its clinical appli... 详细信息

关键词：英语阅读理解生物材料

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碳量子点的生物应用:成像、载药与毒性

材料导报 2017年第19期31卷 35-42页

作者：闫鹏艾凡荣严喜鸾刘东雷南昌大学机电工程学院南昌330031 南昌大学转化医学研究院南昌330088

碳量子点作为一种新型的纳米材料,具有荧光性能优异、尺寸小、毒性低等诸多优势,因而具有良好的应用前景,尤其在生物医学领域有突出的应用价值,近年来引起了科研者们的广泛关注。在介绍碳量子点光学性质的基础上,重点综述了碳量子点在... 详细信息

碳量子点作为一种新型的纳米材料,具有荧光性能优异、尺寸小、毒性低等诸多优势,因而具有良好的应用前景,尤其在生物医学领域有突出的应用价值,近年来引起了科研者们的广泛关注。在介绍碳量子点光学性质的基础上,重点综述了碳量子点在生物成像、诊疗剂应用及碳量子点生物毒性等方面的最新研究进展,并探讨了碳量子点未来的发展方向和前景。

关键词：碳量子点生物医学生物成像诊疗剂生物毒性

TiO_2薄膜的低温制备以及工艺优化和性能研究

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涂料工业 2012年第10期42卷 49-52,57页

作者：李勇艾凡荣闫洪南昌大学机电工程学院南昌330031

采用改进溶胶-凝胶法,通过浸渍-提拉工艺在载玻片表面低温制备了锐钛型纳米TiO2薄膜,探讨了水量、pH、水浴时间等工艺参数对TiO2的晶型及光催化活性的影响。利用XRD、FT-IR、SEM和UV-Vis光谱等手段对薄膜的物相、结构、表面形貌以及光... 详细信息

采用改进溶胶-凝胶法,通过浸渍-提拉工艺在载玻片表面低温制备了锐钛型纳米TiO2薄膜,探讨了水量、pH、水浴时间等工艺参数对TiO2的晶型及光催化活性的影响。利用XRD、FT-IR、SEM和UV-Vis光谱等手段对薄膜的物相、结构、表面形貌以及光吸收特性进行了表征,并利用紫外光激发下降解亚甲基蓝溶液来评价TiO2薄膜的光催化活性。结果表明:在低温条件下,所得TiO2薄膜表面均匀平整;随着水量的增加和pH的降低,TiO2晶化程度逐渐提高;水浴前后所制备的TiO2薄膜对紫外光都表现出了极强的吸收特性;水浴处理有利于提高纳米TiO2薄膜的催化活性,80℃水浴8 h后TiO2薄膜对亚甲基蓝溶液的降解率从20.9%提高到72.1%。

关键词：纳米TiO2薄膜低温制备工艺优化 UV-Vis光谱光催化活性光吸收特性紫外光激发水浴处理

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磁性温敏复合微球的制备及磁场中的释药行为

同济大学学报（自然科学版） 2012年第8期40卷 1239-1243页

作者：姚爱华陈绮艾凡荣王德平同济大学材料科学与工程学院上海201804 同济大学先进土木工程材料教育部重点实验室上海201804 南昌大学机电工程学院江西南昌330031

采用无皂乳液聚合的方法将Fe3O4与温敏性N-异丙基丙烯酰胺-丙烯酰胺共聚物[P(NIPAAm-co-Am)]复合,制备了具有核壳结构的磁性温敏复合微球,并研究了其在60kHz,6.5kA·m-1交变磁场作用下的磁热性能和药物缓释行为.结果表明,所制备的Fe3O4/... 详细信息

采用无皂乳液聚合的方法将Fe3O4与温敏性N-异丙基丙烯酰胺-丙烯酰胺共聚物[P(NIPAAm-co-Am)]复合,制备了具有核壳结构的磁性温敏复合微球,并研究了其在60kHz,6.5kA·m-1交变磁场作用下的磁热性能和药物缓释行为.结果表明,所制备的Fe3O4/P(NIPAAm-co-Am)复合微球具有良好的磁热性能,20min内即可使自身温度升高到温敏聚合物的最低临界溶解温度(LCST),约为42°C.复合微球在连续和间歇磁场作用下的药物释放行为显示,间歇性施加磁场能够延长药物的释放周期,而且能够有效增大药物的积累释放量.因具有良好的磁热和药物缓释性能,所制备的聚合物微球有望同步实现肿瘤热疗和化疗药物的可控释放.

关键词：磁性复合微球药物缓释 Fe3O4 P(NIPAAm-co-Am)

纳米TiO_2薄膜的低温制备与光谱特性研究

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化工新型材料 2013年第3期41卷 75-77页

作者：李勇艾凡荣闫洪南昌大学机电工程学院南昌330031

以钛酸丁酯为原料,采用改进溶胶-凝胶法,通过浸渍-提拉工艺在低温条件下制备了锐钛矿纳米TiO2薄膜。利用X射线衍射、紫外-可见光吸收光谱、傅里叶变换红外光谱对所制备的TiO2薄膜的晶型结构和光谱特性进行了分析,并利用紫外光照降解亚... 详细信息

以钛酸丁酯为原料,采用改进溶胶-凝胶法,通过浸渍-提拉工艺在低温条件下制备了锐钛矿纳米TiO2薄膜。利用X射线衍射、紫外-可见光吸收光谱、傅里叶变换红外光谱对所制备的TiO2薄膜的晶型结构和光谱特性进行了分析,并利用紫外光照降解亚甲基蓝溶液来评价所制备薄膜的光催化活性。结果表明:经过陈化和水浴处理后,钛酸丁酯完全水解,所得TiO2薄膜为锐钛矿结构,对紫外光表现出较强的吸收特性。低温水浴处理有利于提高薄膜的光催化活性。

关键词： TiO2薄膜低温光谱特性光催化

Sn基无铅钎料与Cu基板间化合物Cu_6Sn_5的研究进展

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电子元件与材料 2012年第6期31卷 79-83页

作者：胡小武艾凡荣闫洪南昌大学机电工程学院江西南昌330031

主要介绍了Sn基无铅钎料和Cu基板在界面处反应生成的金属间化合物Cu6Sn5与焊接点可靠性的关系。综述了近年来Cu6Sn5的研究进展,内容包括:Sn基无铅钎料在Cu基板上形成的Cu6Sn5的生长形态、晶体取向、生长动力学以及纳米颗粒对界面Cu6Sn5... 详细信息

主要介绍了Sn基无铅钎料和Cu基板在界面处反应生成的金属间化合物Cu6Sn5与焊接点可靠性的关系。综述了近年来Cu6Sn5的研究进展,内容包括:Sn基无铅钎料在Cu基板上形成的Cu6Sn5的生长形态、晶体取向、生长动力学以及纳米颗粒对界面Cu6Sn5尺寸及形貌的影响。

关键词： Sn基无铅钎料 Cu6Sn5 综述生长形态