scholarly journals Investigation of thermal energy transport interface of hybrid graphene-carbon nanotube/polyethylene nanocomposites

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Feng Liu ◽  
Xuyang Liu ◽  
Ning Hu ◽  
Huiming Ning ◽  
Satoshi Atobe ◽  
...  
2005 ◽  
Author(s):  
Jose´ E. Solomon ◽  
Jay Kapat ◽  
Ranganathan Kumar ◽  
Deepak Srivastava

The focus of the current research is the investigation and characterization of the energy transport between a (10,10) single-wall carbon nanotube (SWCNT) and surrounding molecular hydrogen gas using molecular dynamics (MD) simulations. The MD simulations use Tersoff-Brenner hydrocarbon potential for C-C, C-H, and H-H bonding interactions and the conventional Lennard-Jones potential for soft-sphere gas-CNT collision dynamics of H-H and H-C non-bonding van der Waals interactions. A simulation cell with periodic boundary conditions is created for 1200 carbon atoms in an armchair nanotube configuration and three distinct gas densities corresponding to 252, 500, and 1000 H2 molecules in the same volume. The MD simulation runs are performed with time steps of 0.1 fs and the total simulation times of 40 ps. The simulations are initialized by setting the gas species and CNT at two different temperatures. Initial gas temperatures range from 2000K to 4000K, whereas the carbon nanotube is held at 300K. After the equilibrium temperatures of the CNT and the gas molecules are achieved, the external constraints to maintain the temperature are removed and the thermal energy transport between the two is studied. The kinetic energy exchange between the nanotube and the surrounding gas is monitored to study thermal energy transport over the duration of the simulation. A parameter is proposed, the coefficient of thermal energy transfer (CTET), to characterize the thermal transport properties of the modeled systems based on parameters governing the transport process, thus mimicking the conventional heat transfer coefficient. Values for CTET vary directly with gas density and range from 50 MW/m2K to 250MW/m2K, showing that gas density has a significant impact with higher density corresponding to higher collision rates and higher rates of energy transfer. In contrast, the gas temperature has a lower impact on CTET, with colder gas providing in certain cases a slightly lower value for the coefficient. In order to validate the MD simulations, the time-series data of molecular vibrations of the CNT is converted to a vibrational frequency spectrum through FFT. The characteristic frequencies obtained on the spectra of isolated SWCNT and H2 simulations are compared against the known natural frequencies of the CNT phonon modes and vibrational modes of H2 molecules. The comparison is quite favorable.


2017 ◽  
Vol 2 (10) ◽  
pp. 2283-2292 ◽  
Author(s):  
Xingfei Wei ◽  
Teng Zhang ◽  
Tengfei Luo

Author(s):  
Saman Rashidi ◽  
Faramarz Hormozi ◽  
Nader Karimi ◽  
Waqar Ahmed

Author(s):  
Ravi Prasher ◽  
Tao Tong ◽  
Arun Majumdar

The advent of nanotechnology makes it possible to make constrictions of nanoscale size between contacting solids. For example devices or structures made of nanowires and nanoparticles can form a nano sized constriction. In these structures, the nanowires or nanoparticles are typically in contact with each other or another solid surface forming contact constrictions of the order of few nanometers. Understanding the thermal energy transport across the nano-constrictions is of critical importance in these applications. Our previous study derived the ballistic conductance across the constriction (Prasher, R.S., Nano Letters 5, 2155-2159 (2005)). In this paper, we further consider the wave effect of the phonons when crossing the constrictions. We show in the Rayleigh regime, where the dominant phonon wavelengths are much larger than the constriction sizes, the constriction conductance varies with temperature as T7


2002 ◽  
Vol 2002.77 (0) ◽  
pp. _2-19_-_2-20_
Author(s):  
Qiu sheng LIU ◽  
Akira YABE ◽  
Fumio TAKEMURA ◽  
Shiro KAJIYAMA ◽  
Katsuya FUKUDA

1984 ◽  
Vol 45 (2) ◽  
pp. 133-140 ◽  
Author(s):  
Stephan L. Linn ◽  
Harry S. Robertson

2009 ◽  
Vol 476 (4-6) ◽  
pp. 271-276 ◽  
Author(s):  
Philipp A.E. Schoen ◽  
Bruno Michel ◽  
Alessandro Curioni ◽  
Dimos Poulikakos

2011 ◽  
Vol 109 (7) ◽  
pp. 074321 ◽  
Author(s):  
Tengfei Luo ◽  
Keivan Esfarjani ◽  
Junichiro Shiomi ◽  
Asegun Henry ◽  
Gang Chen

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