Heat Transport Can Be Blocked More Effectively With a More Optimized Holey Nanostructure


Reading time ( words)

The group of professor Ilari Maasilta at the Nanoscience Center, University of Jyväskylä specializes on studying how different nanostructures can be used to enhance or impede the transport of heat. The group’s latest results, published in the journal Physical Review Applied on the 3rd of July, 2019, confirm its earlier observations that by using the wave nature of heat in holey nanostructures heat conduction can be reduced by over hundredfold.

The most important applications of controlling heat transport are in fields such as thermoelectric power conversion and cooling, and bolometric radiation detection.

The holey structures consisted of thin insulating silicon nitride plates containing a periodic array of holes in two directions. In principle, any other material could be used, as well. In particular, the group demonstrated that there is an optimal periodic structure, which minimizes the thermal conduction to a record low level, with a period of about 10 micrometers.

In addition, it was realized that if the hole side surfaces could be fabricated with atomic precision, heat conduction could be reduced even further with larger period structures.

"In the future, we will use these results  to improve sensitive infrared radiation detectors for future space research, in collaboration with NASA," says professor Ilari Maasilta.

Share

Print


Suggested Items

How to Dismantle a Nuclear Bomb

10/01/2019 | Peter Dizikes, MIT News Office
How do weapons inspectors verify that a nuclear bomb has been dismantled? An unsettling answer is: They don’t, for the most part. When countries sign arms reduction pacts, they do not typically grant inspectors complete access to their nuclear technologies, for fear of giving away military secrets.

DARPA Program Aims to Extend Lifetime of Quantum Systems

01/19/2018 | DARPA
Whether it is excited electrons emitting photons in a lightbulb or the vibrational frequency of atoms in an atomic clock, quantum phenomena are simultaneously fundamental aspects of nature and the basis of current state-of-the-art and future technologies.

DARPA, Santa Continue HO HO HO-liday Team-Up

12/26/2017 | DARPA
DARPA’s High-speed Optimized Handling of Holiday Operations (HO HO HO) initiative is celebrating its fourth anniversary this year, and the Agency is proud to continue its tradition of sharing breakthrough technologies to help Santa Claus and his elves more quickly and efficiently complete their holiday duties.



Copyright © 2019 I-Connect007. All rights reserved.