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Electrospun TiO2 nanofibers for gas sensing applications 用于气敏应用的静电纺丝TiO2纳米纤维
Pub Date : 2006-05-07 DOI: 10.1201/9780429187469-87
Ildoo Kim, A. Rothschild, H. Tuller, D. Y. Kim, S. Jo
Nanostructured TiO2 has attracted much attention for a variety of applications including photocatalysts, electrodes for water photolysis, dye-sensitized solar cells, and gas sensors. In this work we report on TiO2 fiber mats for use in gas sensors demonstrating exceptionally high sensitivity to NO2, a toxic gas responsible for acid rain and other air pollution effects, and high sensitivity to H2, a potentially explosive gas.
纳米TiO2在光催化剂、水光解电极、染料敏化太阳能电池和气体传感器等领域的应用备受关注。在这项工作中,我们报告了用于气体传感器的TiO2纤维垫对NO2(一种导致酸雨和其他空气污染的有毒气体)和H2(一种潜在爆炸性气体)具有异常高的灵敏度。
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引用次数: 5
Titanium Dioxide Nanostructured Coatings: Application in Photocatalysis and Sensors 二氧化钛纳米结构涂层:在光催化和传感器中的应用
Pub Date : 2006-05-07 DOI: 10.1201/9780429187469-63
D. A. Rousan, J. Byrne, G. Dale, Donaldson V.J.A., Dunlop P.S.M., Hamilton J.W.J., T. McMurray, J. Rankin
This paper presents some of the research work taking place at the University of Ulster investigating preparation, characterisation and application of nanostructred TiO2. Four exemplars are used to demonstrate the potential applications of these materials i.e. photocatalytic disinfection of water containing chlorine resistant microorganisms, photocatalytic ‘self-cleaning’ of surfaces contaminated with protein, transducers for electrochemical biosensors and finally new opportunities presented by electrochemical growth of TiO2 aligned nanotubes.
本文介绍了阿尔斯特大学正在进行的一些研究工作,研究纳米结构TiO2的制备、表征和应用。四个例子被用来展示这些材料的潜在应用,即光催化消毒含有氯抗性微生物的水,光催化“自清洁”被蛋白质污染的表面,电化学生物传感器的换能器,最后是二氧化钛排列纳米管的电化学生长带来的新机会。
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引用次数: 3
Heat Transfer Cost-Effectiveness of Nanofluids 纳米流体的传热成本效益
Pub Date : 2006-05-07 DOI: 10.1201/9780429187469-21
L. Pan, D. Xu, Q. Yao
When metal or oxide nano particles are dispersed in liquids to form nanofluids, the particles improve thermal conductivity of the liquids. Therefore, it is suggested to use nanofluids as coolants to improve heat-exchanger efficiency. However, the nano particles also cause the increase of fluid viscosity. The present paper has numerically studied the flow and heat transfer of the nanofluids in a 2-D microchannel by using Computational Fluid Dynamics method. It is found that although the nano particles enhance the heat transfer rate of the fluids about certain percentage, the nano particles also cause an increase of viscous shear stress, and further causes an increase of the power consumption to deliver the nanofluids through the microchannels. To explore their advantage, nanofluids are suggested to be used as coolants to improve the thermal efficiency and to reduce the size of heat exchangers. However, the nanofluids also enlarge fluid shear stresses on solid interfaces. This is because that the nano particles increase the viscosity of the fluids. The enlarged shear stresses will increase the fluid drags. This makes it difficult for the nanofluids to flow through the fluidic systems comparing with those base liquids (2, 3). Therefore, a big pressure difference is required to drive the nanofluids to flow through the fluidic systems. This in turn will cause more power consumption. So, one has to carefully analyze the gain and the loss or cost-effectiveness, before adopting the nanofluids as coolants. To investigate the cost-effectiveness of using nanofluids as coolants, Computational Fluid Dynamics method is employed to directly simulate the flow and heat transfer of the nanofluids in a 2-dimensional micro channel in the present paper. Basically there are two different numerical methods for doing these. One is based on molecular dynamics which directly focuses on the molecular behaviors of the nano particles. This method needs more CPU time and computer memory. The other is based on Navier-Stokes questions with introducing the thermal and dynamic parameters of the nanofluids obtained from the mixture fluid theory and experimental measurements. The latter provides useful information for researchers and engineers to understand the flow and heat transfer profiles of the fluidic devices with less CPU time and computer memory (2, 3). Therefore, it is employed in the present paper to study the cost-effectiveness of the nanofluids in a 2-dimensional micro channel.
当金属或氧化物纳米颗粒分散在液体中形成纳米流体时,纳米颗粒提高了液体的导热性。因此,建议使用纳米流体作为冷却剂来提高换热器的效率。然而,纳米颗粒也会引起流体粘度的增加。本文采用计算流体力学方法对二维微通道内纳米流体的流动和传热进行了数值研究。研究发现,纳米颗粒虽然在一定程度上提高了流体的换热速率,但也造成了黏性剪切应力的增加,从而导致纳米流体通过微通道的输送功率的增加。为了探索纳米流体的优势,建议使用纳米流体作为冷却剂,以提高热效率并减小换热器的尺寸。然而,纳米流体也增大了固体界面上的流体剪切应力。这是因为纳米颗粒增加了流体的粘度。剪切应力的增大会增大流体阻力。这使得纳米流体与基液相比难以通过流体系统(2,3)。因此,需要较大的压差来驱动纳米流体通过流体系统。这反过来又会导致更多的电力消耗。因此,在采用纳米流体作为冷却剂之前,必须仔细分析其得失或成本效益。为了研究纳米流体作为冷却剂的成本效益,本文采用计算流体动力学方法直接模拟了纳米流体在二维微通道中的流动和传热。基本上有两种不同的数值方法来做这些。一种是基于分子动力学,直接关注纳米粒子的分子行为。这种方法需要更多的CPU时间和计算机内存。另一种是基于Navier-Stokes问题,引入由混合流体理论和实验测量得到的纳米流体的热力学和动力学参数。后者为研究人员和工程师了解具有较少CPU时间和计算机内存的流体装置的流动和传热曲线提供了有用的信息(2,3)。因此,本文采用它来研究二维微通道中纳米流体的成本效益。
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引用次数: 1
Nanoporous Silicon Membrane Based Micro Fuel Cells for Portable Power Sources 基于纳米多孔硅膜的便携式微型燃料电池
Pub Date : 2006-05-07 DOI: 10.1201/9780429187469-19
K. Chu, M. Shannon, R. Masel
In this paper the preparation of nanoporous silicon membranes and their usage for the solid electrolyte in micro fuel cells compatible with silicon micro-fabrication technology is presented. The effects of different membrane structures and fuel concentrations were studied. And the micro fuel cell design for improved performances is discussed.
本文介绍了纳米多孔硅膜的制备及其在与硅微加工技术相适应的微燃料电池固体电解质中的应用。研究了不同膜结构和燃料浓度的影响。并对提高微燃料电池性能的设计进行了探讨。
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引用次数: 1
Growth and Some Enzymatic Responses of E. coli to Photocatalytic TiO2 大肠杆菌对光催化TiO2的生长及酶促反应
Pub Date : 2006-05-07 DOI: 10.1002/9780470396612.CH13
H. Chou, A. Erdem, C. Huang, Lin H-Y, D. Metzler
The effects of photocatalytic nano-TiO2 on the survival or die-off of E coli (e.g. TB1) were investigated under ambient conditions. Experimentally, 18-h E. coli culture was exposed to photocatalytic nano-TiO2 at various concentrations, e.g., 0 to 1,000 mg/L and particle sizes, e.g., 3 to 55 nm both in darkness and the presence of several light sources including a simulated solar light. Preliminary results indicated that there was bacteria die-off in the presence of nanoscale TiO2 in dark. Generally it appears that the growth rate decreases as the particle size decreases. The presence of light irradiation significantly enhanced the killing of E. coli due to additional photocatalytic activity. Upon exposure of E. coli to nano-TiO2 the photocatalytic activity that was generated has markedly increased the production of MDA, TTC and GST. SEM observations vividly indicate cell wall damages.
在环境条件下研究了光催化纳米tio2对大肠杆菌(如TB1)存活或死亡的影响。实验中,在黑暗和几种光源(包括模拟太阳光)的存在下,将大肠杆菌培养物暴露于不同浓度(例如0至1,000 mg/L)和粒径(例如3至55 nm)的光催化纳米tio2中18小时。初步结果表明,在黑暗环境中,纳米TiO2的存在会导致细菌死亡。通常情况下,随着颗粒尺寸的减小,生长速率会降低。由于光催化活性的增加,光照射的存在显著增强了对大肠杆菌的杀灭。在大肠杆菌暴露于纳米tio2后,产生的光催化活性显著增加了MDA、TTC和GST的产生。扫描电镜观察生动地显示细胞壁损伤。
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引用次数: 0
Thermostability of TiO2 nanoparticle and its Photocatalytic Reactivity at Different Anatase/Rutile Ratio TiO2纳米颗粒在锐钛矿/金红石不同配比下的热稳定性及其光催化活性
Pub Date : 2006-05-07 DOI: 10.1201/9780429187469-68
C. P. Huang, Kuo C-S, Y. Y. Li, Lin H-Y, T. Y.H.
Thermostability study of commercial P25 TiO2 nanoparticles was carried out by ascending annealing temperature from 400 to 1100 C. The thermostability of TiO2 structure was measured by X-ray diffraction (XRD). Anatase-Rutile phase transition occurred only when temperature exceeds 600C. Rutile weight fraction increased from 25 to 100 % between 400 to 840 C. Phase transition activation energy was calculated by using Arrenhius plot to be 27 kJ/mol. Transmission electron microscope (TEM), Brunauer-Emmett-Teller (BET), and dynamic light scattering (DLS) techniques were applied to determine the size of grown particles. Results of particle size analysis using TEM imaging method were the same as those using BET instruments up to 840 C. BET measurements tend to overestimate the particle size at temperature greater than 840 C. In contrast, DLS overestimate the size of TiO2 particles due to agglomeration in solution. Mean TiO2 particle sizes grew from 25 to 450 nm when temperature increased from 400 to 1100 C. Furthermore, the photocatalytic reactivity in the degradation of dye decreased with the increase of particle size and rutile fraction.
采用400℃至1100℃的退火温度,研究了商用P25 TiO2纳米颗粒的热稳定性,并用x射线衍射仪(XRD)测定了TiO2结构的热稳定性。锐钛矿-金红石相变仅在温度超过600℃时发生。400 ~ 840℃时金红石质量分数由25%增加到100%,用Arrenhius图计算相变活化能为27 kJ/mol。采用透射电子显微镜(TEM)、布鲁诺尔-埃米特-泰勒(BET)和动态光散射(DLS)技术测定生长颗粒的大小。在840℃以下,TEM成像法的粒度分析结果与BET仪器的结果一致,BET仪器在高于840℃的温度下往往会高估TiO2颗粒的大小,而DLS仪器则会因溶液中的团聚而高估TiO2颗粒的大小。当温度从400℃升高到1100℃时,TiO2的平均粒径从25 nm增大到450 nm,并且随着粒径和金红石分数的增加,TiO2降解染料的光催化活性降低。
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引用次数: 0
Molecular Simulation Studies on the Adsorption of Mercuric Chloride 氯化汞吸附的分子模拟研究
Pub Date : 2006-05-07 DOI: 10.1071/EN06034
R. R. Kotdawala, N. Kazantzis, R. Thompson
Environmental context. The Clean Air Act amendments of 1990 identified mercury and associated compounds as hazardous air pollutants of particular concern to human health and the environment. Coal-fired power plants and municipal solid waste incinerators are significant sources of mercury-containing emissions. Adsorption represents a common technique used to alleviate mercury contamination. The present study uses molecular simulations to study the correlation between key surface characteristics of the adsorbent and its mercury capturing ability with a view to the selection and design of novel adsorbents. Abstract. In the present study, Monte Carlo simulations were used to model the physical adsorption of oxidised mercury (mercuric chloride) by zeolite NaX and activated carbon in the temperature range of 400–500 K. In particular, we considered zeolite NaX with spherical cavities and sodium cations, as well as activated carbon with slit carbon pores and hydroxyl, carboxyl and carbonyl sites, and layers of calcium hydroxide. The adsorption capacity and affinity of zeolite NaX were compared with those displayed by activated carbon with different acid sites and calcium hydroxide by assessing the impact on mercuric chloride adsorption within a practical range of magnitudes of the electrostatic interactions considered, namely charge-induced dipole and charge-quadrupole interactions, as well as dispersion interactions.
环境背景。1990年《清洁空气法》修正案将汞及相关化合物确定为对人类健康和环境特别重要的有害空气污染物。燃煤电厂和城市固体废物焚化炉是含汞排放物的重要来源。吸附是一种常用的减轻汞污染的技术。本研究采用分子模拟方法研究了吸附剂的关键表面特性与其捕汞能力之间的关系,以期为新型吸附剂的选择和设计提供依据。摘要在本研究中,采用蒙特卡罗模拟方法模拟了沸石NaX和活性炭在400-500 K温度范围内对氧化汞(氯化汞)的物理吸附。我们特别考虑了具有球形空腔和钠阳离子的沸石NaX,以及具有狭缝碳孔和羟基、羧基和羰基位点的活性炭,以及氢氧化钙层。通过评估在实际范围内考虑的静电相互作用(即电荷诱导的偶极子相互作用和电荷-四极子相互作用以及分散相互作用)对氯化汞吸附的影响,比较了沸石NaX的吸附能力和亲和力与活性炭与不同酸位和氢氧化钙的吸附能力和亲和力。
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引用次数: 0
Preparation and Characterization of Various Nanofluids 各种纳米流体的制备与表征
Pub Date : 2006-05-07 DOI: 10.1201/9780429187469-74
I. Bang, J. Buongiorno, E. Forrest, L. Hu, W. Williams
As part of an effort to evaluate water-based nanofluids for nuclear applications, preparation and characterization has been performed for nanofluids being considered for MIT’s nanofluid heat transfer experiments. Three methods of generating these nanofluids are available: creating them from chemical precipitation, purchasing the nanoparticles in powder form and mixing them with the base fluid, and direct purchase of prepared nanofluids. Characterization of nanofluids includes colloidal stability, size distribution, concentration, and elemental composition. Quality control of the nanofluids to be used for heat transfer testing is crucial; an exact knowledge of the fluid constituents is a key to uncovering mechanisms responsible for heat transport enhancement.
作为评估水基纳米流体用于核应用的努力的一部分,麻省理工学院正在考虑为纳米流体传热实验制备和表征纳米流体。产生这些纳米流体的方法有三种:通过化学沉淀法制造,购买粉末形式的纳米颗粒并将其与基础流体混合,以及直接购买制备好的纳米流体。纳米流体的表征包括胶体稳定性、尺寸分布、浓度和元素组成。用于传热测试的纳米流体的质量控制至关重要;对流体成分的精确了解是揭示热传递增强机制的关键。
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引用次数: 15
Systematic Approach on Modeling and Identification for Nanobattery Prototyping 纳米电池原型建模与辨识的系统方法
Pub Date : 2006-05-07 DOI: 10.1201/9780429187469-77
P. Bhattacharya, Z. Ye, E. Walker, F. Lacy, Madhusmita Banerjee
This article is concerned with the systematic design of nanobattery prototyping. Miniaturization of power sources is a challenging area of nanotechnology research. There are four major parts in miniaturized Li-Ion nanobattery: anode, cathode, electrode and separator. Correspondingly, some appropriate material must be distinguished. The multiwalled carbon nanotube array electrode is used as anode, which exhibits high current density. LiMn2O4 spinel oxide is used as the cathode. Nanoporous dielectric membrane is selected for mixture storage of gel electrolyte. Ni is chosen as a suitable current collector. The separator and electrolyte container accounts for the reduction of dendrites and compatibility increment of electrode-electrolyte. According to nanobattery physical mechanism, mathematical model has been identified. At last, some numerical simulations of nanobattery characteristics have been conducted.
本文研究了纳米电池原型的系统设计。电源的小型化是纳米技术研究的一个具有挑战性的领域。小型化锂离子纳米电池主要由阳极、阴极、电极和隔膜组成。相应地,必须区分一些适当的材料。采用多壁碳纳米管阵列电极作为阳极,具有较高的电流密度。采用氧化尖晶石LiMn2O4作为阴极。凝胶电解质的混合储存选择纳米多孔介质膜。选择Ni作为合适的集电极。隔膜和电解液容器的存在减少了枝晶,增加了电极-电解液的相容性。根据纳米电池的物理机理,建立了纳米电池的数学模型。最后,对纳米电池的特性进行了数值模拟。
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引用次数: 0
Design and Manufacturing Concepts of Nanoparticle-reinforced Aerospace Materials 纳米颗粒增强航空航天材料的设计与制造概念
Pub Date : 2006-05-07 DOI: 10.1201/9780429187469-62
V. Basenuk, M. Kireitseu, G. Tomlinson
Nanoparticle-based vibration damping shows the effect that molecule-level mechanism can have on the damping and that nanoparticles/fibres/tubes-reinforced composite materials can provide enhanced strength and vibration damping properties over the broader operational conditions. It is particularly worth noting that carbon nanotubes can act as a simple nanoscale spring. The mechanisms involved in such materials need to be understood and the relevance to damping identified. The focus in this paper is directed toward the development of the next generation of vibration damping systems, providing a road map to manufacturing technology and design solutions. The research work concentrates on an investigation related to nanoparticlereinforced materials extensive dynamic characterization and modelling of their fundamental phenomena that control relationships between design and damping properties across the length scales.
基于纳米颗粒的减振显示了分子水平机制对减振的影响,纳米颗粒/纤维/管增强复合材料可以在更广泛的操作条件下提供增强的强度和减振性能。特别值得注意的是,碳纳米管可以作为一个简单的纳米级弹簧。需要了解这些材料所涉及的机制,并确定其与阻尼的相关性。本文的重点是针对下一代减振系统的发展,提供制造技术和设计解决方案的路线图。研究工作集中在纳米颗粒增强材料的广泛动态表征和建模的基本现象,控制设计和阻尼性能之间的关系跨越长度尺度的调查。
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引用次数: 1
期刊
2007 Cleantech Conference and Trade Show Cleantech 2007
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