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为您找到包含“材料学”的内容共158

骆凡

2011-08-22

以有机物前驱体法制备铝酸盐尖晶石MAl2O4( M=Cu,Zn),采用X-射线衍射、透射电镜等手段对样品进行表征。结果表明:700℃焙烧得ZnAlO4,800℃焙烧得到CuAlO4和微量CuO。在以甲基橙为降解物和100W汞灯辐照2h的光催化实验中,700℃焙烧ZnAl2O4粉体对甲基橙的脱色率为89.4%;而800℃的CuAl2O4显示了优异的降解效果,对甲基橙的脱色率可以达到96.7%。

泉州医学高等专科学校药学系

#材料科学#

0评论(0 分享(0)

Liu Mingxian

Incompatibility between hydrophilic chitosan (CS) fiber and the hydrophobic polymer matrices leads to unsatisfied properties of the composites. The crystallization of polymer on the surface of fiber is a possible way to increase the interfacial interactions. Here, we coated the graphene oxide on CS fiber surface via electrostatic self-assembly to improve the interfacial crystallization between polymer and the CS fiber. Structures of the CS fiber before and after graphene coating were characterized by various methods. The formation of polypropylene (PP) transcrystalline (TC) on the CS fiber surface was studied. It is noted that the low crystallization temperature of fiber induced TC is faster than that at high temperature. There exists α and β crystal of PP in the TC formation process as evidenced by X-ray diffraction and the melting experiment. Polarized light optical microscope results demonstrate the graphene coated CS fiber can also enhance the TC nucleation ability of poly(L-lactide).

2015-12-11

Specialized Research Fund for the Doctoral Program of Higher Education of China (grant No. 20114401120003

Department of Materials Science and Engineering, College of Science and Engineering, Jinan University, Guangzhou 510632

#Materials Science#

0评论(0 分享(0)

巩桂芬,吴谙宇,朱丽娜,王晓惠

2013-12-26

本文采用纤维素为原料,以离子液体为溶剂,在微波辐射下进行纤维素的预处理。预处理完全后进行再生纤维素的酶解产糖,并采用DNS分光光度计法进行还原糖产率的测定,进而分析微波功率与时间对再生纤维素还原糖产率的影响。还原糖转化率最佳值(96.21%)为微波功率为230W时;微波功率分别为118W、230W和385W时,稻秆产糖量随着微波时间的延长而呈现先上升后下降的趋势;在较强的功率539W条件下,延长作用时间则会引起还原糖转化率的上升,但继续延长时间,溶剂完全喷溅,难以继续溶解。

哈尔滨理工大学材料科学与工程学院,哈尔滨理工大学材料科学与工程学院,哈尔滨理工大学材料科学与工程学院,哈尔滨理工大学材料科学与工程学院

#材料科学#

0评论(0 分享(0)

Liu Mingxian

As unique tubular nanoclay, halloysite nanotubes (HNTs) have recently attracted great research attentions. HNTs have a diameter of ~50 nm, an inner lumen of 20 nm and a length of 200-1000 nm. HNTs are biocompatible nanomaterial available in thousands of tons in nature, which makes them good candidates for biomedical area applications. Drawbacks of the HNTs include brittleness, difficult to fabricate, low fracture strength, high density, and inadequate biocompatibility. Polysaccharide-HNTs composites provide alternative choice to overcome these shortcomings of HNTs. HNTs can be easily incorporated into polysaccharides via solution mixing, such as chitosan (CS) and sodium alginate, for forming composite film, porous scaffolds, or hydrogel. The interfacial interactions, such as electrostatic attraction and hydrogen bonding, between HNTs and the polysaccharides are critical for the properties improvement. Morphology results show that HNTs are uniformly dispersed in the composites. The mechanical strength and Young's modulus of the composite both in dry state and wet state are enhanced by HNTs. HNTs also can increase the storage modulus, glass transition temperature, and thermal stability of the composites. Cytocompatibility results demonstrate that the polysaccharides-HNTs composites have low cytotoxicity even when the loading of HNTs is higher than 80%. Therefore, the polysaccharides-HNTs composites shows great potentials for biomedical applications, such as tissue engineering scaffold materials, wound dressing materials, drug delivery carrier, and cell isolation surfaces.

2015-12-11

Specialized Research Fund for the Doctoral Program of Higher Education of China(grant No. 20114401120003

Department of Materials Science and Engineering, College of Science and Engineering, Jinan University, Guangzhou 510632

#Materials Science#

0评论(0 分享(0)

韩非,廉杰,王晓敏,王永祯

2012-02-20

使用改进的Hummers法制备氧化石墨烯,再利用浸渍还原法一步制备得到石墨烯基Pt-Sn催化剂(Pt-Sn/graphene),氧化石墨烯在反应过程中被乙二醇原位还原为石墨烯。所制得的Pt-Sn纳米颗粒均匀分布在石墨烯表面,平均粒径为3.19nm。XPS表明,Sn元素部分以SnO2的形式存在。电化学研究表明,石墨烯做载体相较炭黑做载体更能明显提高纳米金属颗粒的催化效果。Pt-Sn/graphene催化剂在保证催化效果的前提下,使甲醇的氧化能够在更低的电位下进行。Sn元素与石墨烯的协同作用,有效的增强了催化剂抗CO中毒能力,使IF/IR值高达2.18。

山西省自然科学基金 (20100011033-2

国家自然科学基金(51172152

教育部新世纪优秀人才 (NECT-08-0888

太原理工大学材料科学与工程学院,太原 (030024),太原理工大学材料科学与工程学院,太原 (030024),太原理工大学材料科学与工程学院,太原 (030024),太原理工大学材料科学与工程学院,太原 (030024)

#材料科学#

0评论(0 分享(0)

杨兵,万强,田灿鑫,阎少健,刘辉东,王如意,李正刚,陈燕鸣,付德君

2013-11-29

系统研究了硅烷对AlTiSiN/CrSiN涂层结构和性能的影响。研究结果表明涂层为B1 NaCl 型结构,其中AlTiSiN和CrSiN形成交替层。随硅烷流量的增加硅含量增加;当硅烷流量从20sccm增加到40sccm时,最高硬度可达3500 Hv0.05。涂层结合力也受硅烷流量的影响,当硅烷流量为48sccm时,涂层结合强度为73N。随对磨材料和硅烷流量的不同,涂层摩擦学性能具有较大的变化。

国家自然科学基金(50905130

高等学校博士学科点专项科研基金(20090141120067

武汉大学动力与机械学院,武汉 430072,武汉大学动力与机械学院,武汉 430072,武汉大学物理科学与技术学院加速器实验室,武汉 430072,武汉大学物理科学与技术学院加速器实验室,武汉 430072,武汉大学动力与机械学院,武汉 430072,武汉大学动力与机械学院,武汉 430072,武汉大学动力与机械学院,武汉 430072,武汉大学动力与机械学院,武汉 430072,武汉大学物理科学与技术学院加速器实验室,武汉 430072

#材料科学#

0评论(0 分享(0)

CHENG Delin,HAO Lijing,HOU Jie,GAO Huichang,CAO Xiaodong,WANG Yingjun

Native cells live in an 3-D extracellular matrix capable of regulating cell function. Specific topographies have been well proven to mediate cellular behaviors. However, present topographies are almost all constructed on 2-D substrates like discs and films, which are far from features like 3-D and porosity with respect to bone repair scaffolds. Here we bottom-up assembled poly(lactic-co-glycolic acid)/calcium carbonate (PLGA/CC) composite microspheres with superficial macropores into a 3-D scaffold with macroporous topography. The residual of water and solvent in microsphere units enabled the bondind of adjacent microspheres at 37 ℃. Since scaffolds were obtained through a mild process, the bioactivity of loaded BMP-2 was well retained. The study provides insight into enhancing function of practical scaffolds by elaborate topography design.

2014-07-29

National Basic Research Program of China (2012CB619100

111 project( 2011CB606204

the Specialized Research Fund for the Doctoral Program of Higher Education of China(B13039

he Fundamental Research Funds for the Central Universities(20110172120002

National Natural Science Foundation of China(2013ZZ0005

School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641,School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641,School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641,School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641,School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641,School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641

#Materials Science#

0评论(0 分享(0)

王泽岩

2014-01-02

在本文中,报道了一种新型钛基有机-无机复合材料的制备及其光催化性质研究。通过对所制备的材料进行结构、形貌以及组分的分析,研究其制备过程以及结构方面的特点。并通过降解有机染料分子,系统研究了其光催化性质。

高等学校博士学科点专项科研基金(20100131120028

山东大学 晶体材料研究所,济南,250100

#材料科学#

0评论(0 分享(0)

韩谦,于然波,王祖民

2018-11-21

在室温下采用简单的一锅法成功合成了铁基金属有机骨架材料Fe-BTC-Pt(x w%)(x代表不同负载量,x=0,0.06,0.12,0.19,0.41,0.6,1.09)。为了理解其组成和形貌,系统地分析了合成后的材料。发现通过此方法可以获得Pt在载体Fe-BTC上纳米级别的分散。此外,基于所得Fe-BTC-Pt(x w%),通过测试其对对硝基苯酚的催化研究了其催化加氢性能。实验发现在本实验负载Pt量范围内,不同担载量下,催化性能在担载量为0.41 w%时最优。

国家自然科学基金(51472025,21671016,51872024

School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083

#材料科学#

0评论(0 分享(0)

胡聪,傅仁利,门家瑞,杨詹詹,范徐辉

2020-01-09

随着对第五主族元素的不断开发,锑烯成为近年来二维材料的研究热点之一。大量的理论和实验工作预测并验证了锑烯丰富的光学、电学和热电性能等功能特性,由此衍生出各式各样可能的应用。同时,二维材料的制备方法作为研究重点也在不断发展。本文综述了近年来关于锑烯材料的制备方法和性能研究的成果,并对锑烯材料潜在的应用进行了展望。

School of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211106,School of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211106,School of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211106,School of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211106,School of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211106

#材料科学#

0评论(0 分享(0)