Featured Research

from universities, journals, and other organizations

Revisiting quantum effects in micro- and nano-electromechanical devices

Date:
November 15, 2013
Source:
Springer Science+Business Media
Summary:
New calculations shows that the influence of quantum effects on the operating conditions of nanodevices has, until now, been overestimated. Micro- and nano-electromechanical devices, referred to as MEMS and NEMS, are ubiquitous. These nanoscale machines with movable parts are used, for example, to trigger cars' airbags following a shock. They can also be found in smartphones, allowing them to detect how to adequately display the screen for the viewer. The trouble is that, as their size decreases, forces typically experienced at the quantum level start to matter in these nanodevices.

New calculations shows that the influence of quantum effects on the operating conditions of nanodevices has, until now, been overestimated.

Related Articles


Micro- and nano-electromechanical devices, referred to as MEMS and NEMS, are ubiquitous. These nanoscale machines with movable parts are used, for example, to trigger cars' airbags following a shock. They can also be found in smartphones, allowing them to detect how to adequately display the screen for the viewer. The trouble is that, as their size decreases, forces typically experienced at the quantum level start to matter in these nanodevices. Mexican physicists have studied the mechanical and electrical stability of MEMS and NEMS, depending on the plate thickness and the nature of the material used. The results have now been published in EPJ B by Raul Esquivel-Sirvent and Rafael Perez-Pascual from the National Autonomous University of Mexico, in Mexico City.

Forces of quantum origin become important at the scale of these devices shrinks; this is particularly true for the so-called Casimir force. This force leads to van der Waals interactions, which represent the sum of all intra-molecular interactions. These include attractions and repulsions between atoms, molecules, and surfaces, as well as other intermolecular forces, and are caused by correlations in the fluctuating polarisations of nearby particles.

To investigate the stability of nanodevices, Esquivel-Sirvent and his colleague used the classical calculation of the Casimir force, referred to as the Lifshitz formula, combined with the theory of stability of micro- and nanoscale machines.

In this study, the authors show that previous works overestimated the operating conditions of the devices by not taking into account this Casimir/van der Waals effect.

In addition, they demonstrate that the stability of these devices under the Casimir force changes depending on the nature and thickness of the metal coatings used. It also depends on the variation of concentration of the free charges in the silicon used, which changes with doping levels.


Story Source:

The above story is based on materials provided by Springer Science+Business Media. Note: Materials may be edited for content and length.


Journal Reference:

  1. R. Esquivel-Sirvent, R. Pιrez-Pascual. Geometry and charge carrier induced stability in Casimir actuated nanodevices. The European Physical Journal B, 2013; 86 (11) DOI: 10.1140/epjb/e2013-40779-5

Cite This Page:

Springer Science+Business Media. "Revisiting quantum effects in micro- and nano-electromechanical devices." ScienceDaily. ScienceDaily, 15 November 2013. <www.sciencedaily.com/releases/2013/11/131115094325.htm>.
Springer Science+Business Media. (2013, November 15). Revisiting quantum effects in micro- and nano-electromechanical devices. ScienceDaily. Retrieved October 30, 2014 from www.sciencedaily.com/releases/2013/11/131115094325.htm
Springer Science+Business Media. "Revisiting quantum effects in micro- and nano-electromechanical devices." ScienceDaily. www.sciencedaily.com/releases/2013/11/131115094325.htm (accessed October 30, 2014).

Share This



More Matter & Energy News

Thursday, October 30, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Mind-Controlled Prosthetic Arm Restores Amputee Dexterity

Mind-Controlled Prosthetic Arm Restores Amputee Dexterity

Reuters - Innovations Video Online (Oct. 29, 2014) — A Swedish amputee who became the first person to ever receive a brain controlled prosthetic arm is able to manipulate and handle delicate objects with an unprecedented level of dexterity. The device is connected directly to his bone, nerves and muscles, giving him the ability to control it with his thoughts. Matthew Stock reports. Video provided by Reuters
Powered by NewsLook.com
Robots Get Funky on the Dance Floor

Robots Get Funky on the Dance Floor

AP (Oct. 29, 2014) — Dancing, spinning and fighting robots are showing off their agility at "Robocomp" in Krakow. (Oct. 29) Video provided by AP
Powered by NewsLook.com
Saharan Solar Project to Power Europe

Saharan Solar Project to Power Europe

Reuters - Business Video Online (Oct. 29, 2014) — A solar energy project in the Tunisian Sahara aims to generate enough clean energy by 2018 to power two million European homes. Matt Stock reports. Video provided by Reuters
Powered by NewsLook.com
Lowe's Testing Robot Sales Assistants in California Store

Lowe's Testing Robot Sales Assistants in California Store

Buzz60 (Oct. 29, 2014) — Lowe’s is testing out what it’s describing as a robotic shopping assistant in one of its Orchard Supply Hardware Stores in California. Jen Markham explains. Video provided by Buzz60
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:

Strange & Offbeat Stories

 

Space & Time

Matter & Energy

Computers & Math

In Other News

... from NewsDaily.com

Science News

Health News

    Environment News

    Technology News



    Save/Print:
    Share:  

    Free Subscriptions


    Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

    Get Social & Mobile


    Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

    Have Feedback?


    Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
    Mobile iPhone Android Web
    Follow Facebook Twitter Google+
    Subscribe RSS Feeds Email Newsletters
    Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins