APL Nameplate
  • Volume/Page
  • Keyword
  • DOI
  • Citation
  • Advanced
   
 
 
 

Flickr Twitter iResearch App Facebook

BROWSE VOLUMES

Year Range: 
Search Issue | RSS Feeds RSS
Previous Issue Next Issue

4 Apr 2011

Volume 98, Issue 14, Articles (14xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 98, 141903 (2011); http://dx.doi.org/10.1063/1.3548546 (3 pages)

H. Hattab, A. T. N’Diaye, D. Wall, G. Jnawali, J. Coraux, C. Busse, R. van Gastel, B. Poelsema, T. Michely, F.-J. Meyer zu Heringdorf, and M. Horn-von Hoegen
Enlarge Image | Read More
Return to All Sections
back to top
RSS Feeds

Heat transport in amorphous silicon: Interplay between morphology and disorder

Yuping He, Davide Donadio, and Giulia Galli

Appl. Phys. Lett. 98, 144101 (2011); http://dx.doi.org/10.1063/1.3574366 (3 pages) | Cited 4 times

Online Publication Date: 4 April 2011

Full Text: Read Online (HTML) | Download PDF


See Also: Publisher's Note

Show Abstract
We present a theoretical study of the thermal conductivity (κ) of amorphous silicon (a-Si) based on molecular and lattice dynamics. We find that the majority of heat carriers are quasi-stationary modes; however the small proportion ( ≃ 3%) of propagating vibrations contributes to about half of the value of κ. We show that in bulk samples the mean free path of several long-wavelength modes is on the order of microns; this value may be substantially decreased either in thin films or in systems with etched holes, resulting in a smaller thermal conductivity. Our results provide a unified explanation of several experiments and show that kinetic theory cannot be applied to describe thermal transport in a-Si at room temperature.
Show PACS
66.70.-f Nonelectronic thermal conduction and heat-pulse propagation in solids; thermal waves
65.60.+a Thermal properties of amorphous solids and glasses: heat capacity, thermal expansion, etc.

Dry nanogranular materials

Chia-Nan Yuan, Yueh-Feng Li, Yu-Jane Sheng, and Heng-Kwong Tsao

Appl. Phys. Lett. 98, 144102 (2011); http://dx.doi.org/10.1063/1.3575575 (3 pages) | Cited 2 times

Online Publication Date: 7 April 2011

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Granular materials consisting of macroscopic grains have commercial applications and their flow behavior plays key role in geophysics. However, flow characteristics of nanogranules differ significantly from those of granules. The former can form low-volume fraction (5%) particle gels in air and do not exhibit gravity-driven granular flow easily. It is found that although dry nanogranules possess a high compressibility, close to gases, they are less susceptible to flow than granules due to high yield stress and viscosity. Such differences can be attributed to van der Waals attractions, which support the weight of nanoparticles to form aerogels and resist shearing deformation.
Show PACS
81.05.Rm Porous materials; granular materials
83.80.Fg Granular solids
83.50.-v Deformation and flow
83.60.La Viscoplasticity; yield stress
66.20.Ej Studies of viscosity and rheological properties of specific liquids
82.70.Gg Gels and sols
Return to All Sections
Close

Google Calendar

ADVERTISEMENT

Go to AIP Home   © AIP Publishing LLC
close