نتایج جستجو برای: thermal conductivity enhancement

تعداد نتایج: 374918  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه اراک - دانشکده علوم پایه 1389

انتقال سریع و آسان گرما از مهمترین مسائل صنعت انتقال گرماست. نانوسیالات انواع جدیدی از سیالات هستند که از پراکنده سازی نانوذرات در سیالات پایه تهیه می شوند. تکنولوژی نانوسیال، چالش جدیدی برای هدایت گرمایی سیالات پایه است. دلیل این چالش، هدایت گرمایی نسبتا زیاد نانوسیالات نسبت به سیالات پایه است. در این تحقیق نانوسیال جدیدی که علاوه بر هدایت گرمایی زیاد، ویسکوزیته مناسبی نیز داشته باشد، مورد برر...

2012
Vivek Goyal Alexander A. Balandin

The authors report on synthesis and thermal properties of the electrically conductive thermal interface materials with the hybrid graphene-metal particle fillers. The thermal conductivity of resulting composites was increased by 500% in a temperature range from 300 K to 400 K at a small graphene loading fraction of 5-vol.-%. The unusually strong enhancement of thermal properties was attributed ...

2014
Adnan M. Hussein R. A. Bakar K. Kadirgama K. V. Sharma

Solid particles dispersed in a liquid with sizes no larger than 100nm, known as nanofluids, are used to enhance Thermophysical properties compared to the base fluid. Preparations of alumina (Al2O3), titania (TiO2) and silica (SiO2) in water have been experimentally conducted in volume concentrations ranging between 1 and 2.5%. Thermal conductivity is measured by the hot wire method and viscosit...

2014
M. J. Assael M. Assael R. A. Perkins Y. Takata

This paper contains new, representative equations for the thermal conductivity of normal and parahydrogen. The equations are based in part upon a body of experimental data that has been critically assessed for internal consistency and for agreement with theory whenever possible. Although there are sufficient data at normal temperatures, data at very low or very high temperatures as well as near...

Journal: :Nano letters 2008
Joo-Hyoung Lee Giulia A Galli Jeffrey C Grossman

Room-temperature thermoelectric properties of n-type crystalline Si with periodically arranged nanometer-sized pores are computed using a combination of classical molecular dynamics for lattice thermal conductivity and ab initio density functional theory for electrical conductivity, Seebeck coefficient, and electronic contribution to the thermal conductivity. The electrical conductivity is foun...

Journal: :ACS nano 2013
Richard Gulotty Micaela Castellino Pravin Jagdale Alberto Tagliaferro Alexander A Balandin

Carboxylic functionalization (-COOH groups) of carbon nanotubes is known to improve their dispersion properties and increase the electrical conductivity of carbon-nanotube-polymer nanocomposites. We have studied experimentally the effects of this type of functionalization on the thermal conductivity of the nanocomposites. It was found that while even small quantities of carbon nanotubes (~1 wt ...

2016
M. J. Assael E. K. Mihailidou M. L. Huber R. A. Perkins

This paper contains new, representative reference equations for the thermal conductivity of benzene. The equations are based in part upon a body of experimental data that have been critically assessed for internal consistency and for agreement with theory whenever possible. In the case of the dilute-gas thermal conductivity, a theoretically based correlation was adopted in order to extend the t...

Journal: :ACS nano 2011
Yichi Zhang Heng Wang Stephan Kräemer Yifeng Shi Fan Zhang Matt Snedaker Kunlun Ding Martin Moskovits G Jeffrey Snyder Galen D Stucky

An ideal thermoelectric material would be a semiconductor with high electrical conductivity and relatively low thermal conductivity: an "electron crystal, phonon glass". Introducing nanoscale heterostructures into the bulk TE matrix is one way of achieving this intuitively anomalous electron/phonon transport behavior. The heterostructured interfaces are expected to play a significant role in ph...

2011
Tessy Theres Baby Sundara Ramaprabhu

Nanofluids are having wide area of application in electronic and cooling industry. In the present work, hydrogen exfoliated graphene (HEG) dispersed deionized (DI) water, and ethylene glycol (EG) based nanofluids were developed. Further, thermal conductivity and heat transfer properties of these nanofluids were systematically investigated. HEG was synthesized by exfoliating graphite oxide in H2...

2013
Kun Zhang Yue Zhang Shiren Wang

Organic thermoelectric (TE) materials are very attractive due to easy processing, material abundance, and environmentally-benign characteristics, but their potential is significantly restricted by the inferior thermoelectric properties. In this work, noncovalently functionalized graphene with fullerene by π-π stacking in a liquid-liquid interface was integrated into poly(3,4-ethylenedioxythioph...

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