Featured Research

from universities, journals, and other organizations

Magnets make droplets dance: Reversible switching between static and dynamic self-assembly

Date:
July 22, 2013
Source:
Aalto University
Summary:
Researchers have placed water droplets containing magnetic nanoparticles on strong water repellent surfaces and have made them align in various static and dynamic structures using periodically oscillating magnetic fields. This is the first time researchers have demonstrated reversible switching between static and dynamic self-assembly.

Static self-assembly of seven magnetic droplets on a copper substrate with superhydrophobic coating.
Credit: Courtesy of Mika Latikka and Jaakko Timonen / Aalto University

Researchers from Aalto University and Paris Tech have placed water droplets containing magnetic nanoparticles on strong water repellent surfaces and have made them align in various static and dynamic structures using periodically oscillating magnetic fields. This is the first time researchers have demonstrated reversible switching between static and dynamic self-assembly.

'We are conducting this line of research because it opens up a way to create new responsive and intelligent systems and materials,' said Dr. Robin Ras of Aalto University, Finland.

Self-assembly is a process in which multiple components form organized structures or patterns without external direction. The process is very interesting both for scientists and industry, because many natural systems rely on self-assembled structures and they can further inspire technological applications.

'The structure formation can either be static, driven by energy minimization, or dynamic, driven by continuous energy feed. Over the years we have managed to create functional materials based on static self-assembled hierarchies. This model system paves the way towards even more versatile dynamic materials, wherein the structures are formed by feeding energy,' said Academy Professor Olli Ikkala.

By using the new model system, the researchers demonstrated that static droplet patterns can transform reversibly into dynamic ones when energy is fed to the system via an oscillating magnetic field. The transition was observed to be complex and the most complicated patterns emerged when the energy feed was just enough to enter the dynamic self-assembly regime.

In addition to the hard science behind the self-assembly, the droplet patterns are also visually captivating.

'In some patterns, the motion of the droplets resembles that of dancing. We find it simply beautiful,' said Dr. Jaakko Timonen.

This work is part of the newly completed doctoral thesis of Jaakko Timonen at the Aalto University Department of Applied Physics. It is a multidisciplinary research, combining expertize in magnetic nanoparticle synthesis, superhydrophobic surfaces, and in-depth understanding of self-assemblies.

'Jaakko Timonen΄s broad expertize was instrumental in combining three seemingly unrelated fields: magnetic nanoparticles water repellent coatings, and self-assembly,' said Dr. Ras.


Story Source:

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


Journal Reference:

  1. J. V. I. Timonen, M. Latikka, L. Leibler, R. H. A. Ras, O. Ikkala. Switchable Static and Dynamic Self-Assembly of Magnetic Droplets on Superhydrophobic Surfaces. Science, 2013; 341 (6143): 253 DOI: 10.1126/science.1233775

Cite This Page:

Aalto University. "Magnets make droplets dance: Reversible switching between static and dynamic self-assembly." ScienceDaily. ScienceDaily, 22 July 2013. <www.sciencedaily.com/releases/2013/07/130722071942.htm>.
Aalto University. (2013, July 22). Magnets make droplets dance: Reversible switching between static and dynamic self-assembly. ScienceDaily. Retrieved September 19, 2014 from www.sciencedaily.com/releases/2013/07/130722071942.htm
Aalto University. "Magnets make droplets dance: Reversible switching between static and dynamic self-assembly." ScienceDaily. www.sciencedaily.com/releases/2013/07/130722071942.htm (accessed September 19, 2014).

Share This



More Matter & Energy News

Friday, September 19, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Virtual Reality Headsets Unveiled at Tokyo Game Show

Virtual Reality Headsets Unveiled at Tokyo Game Show

AFP (Sep. 18, 2014) — Several companies unveiled virtual reality headsets at the Tokyo Game Show, Asia's largest digital entertainment exhibition. Duration: 00:48 Video provided by AFP
Powered by NewsLook.com
Apple's iOS8 Includes New 'Killswitch' To Curb Theft

Apple's iOS8 Includes New 'Killswitch' To Curb Theft

Newsy (Sep. 18, 2014) — Apple's new operating system, iOS 8, comes with Apple's killswitch feature already activated, unlike all the models before it. Video provided by Newsy
Powered by NewsLook.com
Stocks Hit All-Time High as Fed Holds Steady

Stocks Hit All-Time High as Fed Holds Steady

AP (Sep. 17, 2014) — The Federal Reserve signaled Wednesday that it plans to keep a key interest rate at a record low because a broad range of U.S. economic measures remain subpar. Stocks hit an all-time high on the news. (Sept. 17) Video provided by AP
Powered by NewsLook.com
Space Race Pits Bezos Vs Musk

Space Race Pits Bezos Vs Musk

Reuters - Business Video Online (Sep. 16, 2014) — Amazon CEO Jeff Bezos' startup will team up with Boeing and Lockheed to develop rocket engines as Elon Musk races to have his rockets certified. Fred Katayama reports. Video provided by Reuters
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:
from the past week

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