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纳米力学进展(续) 被引量:9
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作者 杨卫 王宏涛 +1 位作者 马新玲 洪伟 《力学进展》 EI CSCD 北大核心 2003年第2期175-186,共12页
概述2002年度在纳米力学方面的若干新进展.在纳观计算力学方面,讨论了在微结构质流演化算法、纳米结构中应变的量子效应算法、LMPM并行算法等方面的进展.在纳观实验力学范畴,着重介绍了立体刻蚀的微加载系统.然后,我们展述了在纳米晶体... 概述2002年度在纳米力学方面的若干新进展.在纳观计算力学方面,讨论了在微结构质流演化算法、纳米结构中应变的量子效应算法、LMPM并行算法等方面的进展.在纳观实验力学范畴,着重介绍了立体刻蚀的微加载系统.然后,我们展述了在纳米晶体力学、纳米管力学和纳米压痕力学等方面的新进展. 展开更多
关键词 纳米力学 2002年 研究进展 纳米晶体力学 纳米压痕力学 纳米管力学 量子效应算法
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Entropy analysis of SWCNT & MWCNT flow induced by collecting beating of cilia with porous medium 被引量:3
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作者 Muhammad N ABRAR Muhammad SAGHEER Shafqat HUSSIAN 《Journal of Central South University》 SCIE EI CAS CSCD 2019年第8期2109-2118,共10页
In this article, we considers the thermodynamics analysis of creeping viscous nanofluid flow in a horizontal ciliated tube under the effects of a uniform magnetic field and porous medium. Moreover, energy analysis is ... In this article, we considers the thermodynamics analysis of creeping viscous nanofluid flow in a horizontal ciliated tube under the effects of a uniform magnetic field and porous medium. Moreover, energy analysis is performed in the presence of an internal heat source and thermal radiation phenomena. The thermal conductivity of base fluid water is strengthened by considering the carbon nanotubes (CNTs). Mathematical formulation operated, results in a set of non-linear coupled partial differential equations. The governed differential system is transformed into an ordinary differential system by considering suitable similarity variables. Exact solutions in the closed form are computed for the temperature, momentum and pressure gradient profiles. In this study, special attention is devoted to the electrical conductivity of the CNTs. Streamlines patterns are also discussed to witness the flow lines for different parameters. Thermodynamics analysis shows that entropy of the current flow system is an increasing function of Brinkmann number, magnetic parameter, nanoparticle concentration parameter and Darcy number. 展开更多
关键词 single-wall carbon nanotubes (SWCNT) multi-wall carbon nanotube (MWCNT) thermodynamics analysis magnetic field Darcy effect thermal radiation
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Photo oxidation of DBT using carbon nanotube titania composite as visible light active photo catalyst 被引量:1
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作者 BARMALA Molood BEHNOOD Mohammad OMIDKHAH Mohammad Reza 《Journal of Central South University》 SCIE EI CAS CSCD 2018年第7期1642-1650,共9页
Sulfur removal from liquid fuels has increased in importance in recent years. Although hydrodesulfurization is the usual method for removing sulfur, the elimination of thiophene compounds using this process is difficu... Sulfur removal from liquid fuels has increased in importance in recent years. Although hydrodesulfurization is the usual method for removing sulfur, the elimination of thiophene compounds using this process is difficult. Photocatalysis is an alternative method being developed for thiophene removal at ambient conditions. Among semiconductors, titania has shown good potential as a photo-catalyst; however, quick recombination of electron holes hinders its commercial use. One way to decrease the recombination rate is to combine carbon nanotubes with a semiconductor. In this work, multiwall carbon nanotube (MWCNT) / titania composites were prepared with different mass ratios of MWCNT to titania using tetraethyl orthotitanate (TEOT) and titanium tetra isopropoxide (TTIP) as precursors of titania. Dibenzothiophene (DBT) photocatalytic removal from n-hexane was measured in both the presence and absence of oxygen. The results indicated that the best removal occurred when the MWCNT to titania ratio was 1. When the ratio exceeded this number, DBT removal efficiency decreased due to light scattering. Also, the composites prepared by TEOT exhibited better efficiency in DBT removal. The research findings suggested that the obtained composite was a visible light active photocatalyst and exhibited better performance in the presence of oxygen. Kinetics of photocatalytic DBT removal was a first-order reaction with removal rate constant 0.7 h–1 obtained at optimum conditions. 展开更多
关键词 advanced oxidation processes carbon nanotube PHOTOCATALYSIS UV kinetics SEMICONDUCTOR sol-gel process
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