Featured Research

from universities, journals, and other organizations

Combating Friction And Stiction In Electronic Devices

Date:
March 19, 2007
Source:
University Of Arkansas
Summary:
Micro-electro-mechanical systems, popularly referred to as MEMS, in small electronic devices often fail because of adhesion and stiction - the attractive force between the surfaces of interacting parts. University of Arkansas researchers have developed a surface-topography engineering method that reduces these forces and will help microscopic parts interact and function smoothly.

Nanoscale Bumps.
Credit: Image courtesy of University Of Arkansas

Micro-electro-mechanical systems, popularly referred to as MEMS, in small electronic devices often fail because of adhesion and stiction - the attractive force between the surfaces of interacting parts. University of Arkansas researchers have developed a surface-topography engineering method that reduces these forces and will help microscopic parts interact and function smoothly.

"There are two approaches to address adhesion and stiction issues in MEMS devices," said Min Zou, assistant professor of mechanical engineering. "One is chemistry - applying chemicals on surfaces to weaken the forces. The other is topography engineering. Our approach was simple - we engineered nanoscale bumps to reduce the contact area between surfaces."

The goal of the project was to create a hydrophobic surface. Determined by a popular engineering benchmark known as the water-contact angle, hydrophobicity describes the process of water "beading up" or turning into a ball, such as rain does on an automobile windshield that has been treated with chemicals. The water-contact angle is the measurement used to describe the extent to which water beads. A water-contact angle greater than 90 degrees is considered hydrophobic, and any angle greater than 150 degrees is considered superhydrophobic. With a water-contact angle of approximately 180 degrees, beads represent a near-perfect sphere with only minimal contact on surfaces.

Using only topography-engineering methods, Zou's team achieved a water-contact angle as high as 137 degrees on silicon. No other researcher has achieved a higher water-contact angle without the use of chemicals. Zou's team also conducted a study that combined the surface-topography engineering method with chemicals. That study achieved a water-contact angle greater than 150 degrees, and thus produced a superhydrophobic surface.

Zou's team started with amorphous silicon - silicon that does not exhibit any crystalline form or shape. The researchers used aluminum to induce crystallization, which manifested as nano- or microcrystallites to form the textured surfaces. The researchers induced crystallization by annealing - a process of heating and cooling - the amorphous silicon in a conventional furnace.

"We demonstrated that the surface area covered by nanotextures can be controlled by changing annealing temperature and duration," Zou said.

In addition to electronic devices, the research applies to biomedical devices. It also advances the understanding of tribology, which is the study of friction, wear and lubrication of interacting surfaces in relative motion, such as gears, bearings and head-disk interfaces in computer hard drives.

Zou presented the research findings in January at the International Conference on Integration and Commercialization of Micro and Nano-systems organized by the American Society of Mechanical Engineers. The research was awarded the conference's best paper award.


Story Source:

The above story is based on materials provided by University Of Arkansas. Note: Materials may be edited for content and length.


Cite This Page:

University Of Arkansas. "Combating Friction And Stiction In Electronic Devices." ScienceDaily. ScienceDaily, 19 March 2007. <www.sciencedaily.com/releases/2007/03/070319102154.htm>.
University Of Arkansas. (2007, March 19). Combating Friction And Stiction In Electronic Devices. ScienceDaily. Retrieved October 1, 2014 from www.sciencedaily.com/releases/2007/03/070319102154.htm
University Of Arkansas. "Combating Friction And Stiction In Electronic Devices." ScienceDaily. www.sciencedaily.com/releases/2007/03/070319102154.htm (accessed October 1, 2014).

Share This



More Matter & Energy News

Wednesday, October 1, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Argentina's Tax Evaders Detected, Hunted Down by Drones

Argentina's Tax Evaders Detected, Hunted Down by Drones

AFP (Sep. 30, 2014) Argentina doesn't only have Lionel Messi the footballer, it has now also acquired "Mesi" the drone system which monitors undeclared mansions, swimming pools and soy fields to curb tax evasion in the country. Duration: 01:18 Video provided by AFP
Powered by NewsLook.com
Do Video Games Trump Brain Training For Cognitive Boosts?

Do Video Games Trump Brain Training For Cognitive Boosts?

Newsy (Sep. 29, 2014) More and more studies are showing positive benefits to playing video games, but the jury is still out on brain training programs. Video provided by Newsy
Powered by NewsLook.com
CERN Celebrates 60 Years of Science

CERN Celebrates 60 Years of Science

Reuters - Business Video Online (Sep. 29, 2014) CERN, the European Organisation for Nuclear Research, celebrates 60 years of bringing nations together through science. As Joanna Partridge reports from inside the famous science centre it's also planning to turn the Large Hadron Collider particle accelerator back on after an upgrade. Video provided by Reuters
Powered by NewsLook.com
This 'Invisibility Cloak' Is Simpler Than Most

This 'Invisibility Cloak' Is Simpler Than Most

Newsy (Sep. 28, 2014) Researchers from the University of Rochester have created a type of invisibility cloak with simple focal lenses. Video provided by Newsy
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