Nanotechnology Now

Our NanoNews Digest Sponsors


Heifer International

Wikipedia Affiliate Button

Home > Press > Researchers model macroscale plasmonic convection to control fluid and particle motion

Depiction of the fluid convection (arrows) overlaid on the background temperature distribution produced by the BNAs and ITO. Inset shows the BNA geometry with a (false color) scanning electron microscope image of a single bowtie; scale bar is 200 nm.
Depiction of the fluid convection (arrows) overlaid on the background temperature distribution produced by the BNAs and ITO. Inset shows the BNA geometry with a (false color) scanning electron microscope image of a single bowtie; scale bar is 200 nm.

Abstract:
Researchers at Illinois have developed a new theoretical model that explains macroscale fluid convection induced by plasmonic (metal) nanostructures. Their model demonstrates the experimentally observed convection velocities of the order of micrometers per second for an array of gold bowtie nanoantennas (BNAs) coupled to an optically absorptive indium-tin-oxide (ITO) substrate.

Researchers model macroscale plasmonic convection to control fluid and particle motion

Urbana, IL | Posted on January 22nd, 2014

"Plasmonics offers numerous opportunities to control fluid motion using light absorption," explained Kimani Toussaint, an associate professor in the Department of Mechanical Science and Engineering (MechSE). "The common understanding in the literature is that the observation of micron/s particle motion in plasmonic tweezers experiments can be accurately modeled if one increased the number of nanostructures—for example, nanoantennas—in the array. We showed that this alone would not explain the phenomena. The ITO is the critical piece to the puzzle,"

"This first collaborative study opens doors to investigate phenomena such as particle separation, nanobubble generation, and optical switching. Computations provide a complementary approach to laboratory observations," said MechSE emeritus professor Pratap Vanka, a co-author of the study. Results of the plasmon-induced convection research, with electrical and computer engineering graduate students Brian Roxworthy and Abdul Bhuiya, have been published in the January issue of Nature Communications.

"This work is the first to establish both theoretically and experimentally that micron/s fluid velocities can be generated using a plasmonic architecture, and provides important insight into the flows affecting particle dynamics in plasmonic optical trapping experiments. And our system can be integrated into microfluidic environments to enable greater dexterity in fluid handling and temperature control," Roxworthy said.

The model uses a set of coupled partial differential equations describing the electromagnetic, heat-transfer, and fluid mechanics phenomena, which is solved using COMSOL Multiphysics, a commercial software package. In the study, gold BNAs are illuminated by 2.5 mW of laser light at three different wavelengths, whereby each wavelength corresponds to be on-, near-, or off-resonance with respect to the plasmon resonance wavelength of the BNAs. A solution containing dielectric, spherical particles with diameters of 1 to 20 microns are placed on the BNAs and used to trace the generated fluid flows.

The development of the model led the researchers to several important conclusions. It allowed them to understand the high-velocity particle motion observed in experiments with plasmonic tweezers, and they realized that inclusion of an ITO layer is critical in distributing the thermal energy created by the BNAs—a fact that has previously been overlooked. Additionally, they found that the ITO alone could be used as a simple, alternative route to achieving fluid convection in lab-on-a-chip environments. The researchers also observed that the plasmonic array alters absorption in the ITO, causing a deviation from Beer-Lambert absorption.

####

For more information, please click here

Contacts:
Kimani Toussaint

217-244-4088

Copyright © University of Illinois College of Engineering

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related Links

Download abstract:

Related News Press

News and information

New lithium-oxygen battery greatly improves energy efficiency, longevity: New chemistry could overcome key drawbacks of lithium-air batteries July 26th, 2016

Scientists test nanoparticle drug delivery in dogs with osteosarcoma July 26th, 2016

Nanometrics Reports Second Quarter 2016 Financial Results July 26th, 2016

Ultrasensitive sensor using N-doped graphene July 26th, 2016

Software

An accelerated pipeline to open materials research: ORNL workflow system unites imaging, algorithms, and HPC to advance materials discovery and design July 24th, 2016

Nanosystem and Digital Surf launch NanoMap Alpha: New surface imaging & metrology software based on Mountains® Technology July 14th, 2016

Leti Develops 3D Network-on-chip to Boost High-performance Computing: Fabrication-ready Hardware-plus-software Communications Solution Boosts Performance, Reduces Energy Consumption July 14th, 2016

'Origami' is reshaping DNA's future: Three leading researchers discuss how DNA may be used as a building material to help us develop a new generation of medicines, build electronic devices and probe the mysteries of proteins July 8th, 2016

Lab-on-a-chip

POSTECH researchers develop a control algorithm for more accurate lab-on-a-chip devices April 6th, 2016

Artificial molecules April 3rd, 2016

New microwave imaging approach opens a nanoscale view on processes in liquids: Technique can explore technologically and medically important processes that occur at boundaries between liquids and solids, such as in batteries or along cell membranes March 16th, 2016

Nanoworld 'snow blowers' carve straight channels in semiconductor surfaces: NIST, IBM researchers report important addition to toolkit of 'self-assembly' methods eyed for making useful devices December 28th, 2015

Discoveries

New lithium-oxygen battery greatly improves energy efficiency, longevity: New chemistry could overcome key drawbacks of lithium-air batteries July 26th, 2016

Scientists test nanoparticle drug delivery in dogs with osteosarcoma July 26th, 2016

Ultrasensitive sensor using N-doped graphene July 26th, 2016

The NanoWizard® AFM from JPK is applied for interdisciplinary research at the University of South Australia for applications including smart wound healing and how plants can protect themselves from toxins July 26th, 2016

Announcements

New lithium-oxygen battery greatly improves energy efficiency, longevity: New chemistry could overcome key drawbacks of lithium-air batteries July 26th, 2016

Scientists test nanoparticle drug delivery in dogs with osteosarcoma July 26th, 2016

Nanometrics Reports Second Quarter 2016 Financial Results July 26th, 2016

Ultrasensitive sensor using N-doped graphene July 26th, 2016

Interviews/Book Reviews/Essays/Reports/Podcasts/Journals/White papers

New lithium-oxygen battery greatly improves energy efficiency, longevity: New chemistry could overcome key drawbacks of lithium-air batteries July 26th, 2016

Scientists test nanoparticle drug delivery in dogs with osteosarcoma July 26th, 2016

Ultrasensitive sensor using N-doped graphene July 26th, 2016

The NanoWizard® AFM from JPK is applied for interdisciplinary research at the University of South Australia for applications including smart wound healing and how plants can protect themselves from toxins July 26th, 2016

Tools

Nanometrics Reports Second Quarter 2016 Financial Results July 26th, 2016

The NanoWizard® AFM from JPK is applied for interdisciplinary research at the University of South Australia for applications including smart wound healing and how plants can protect themselves from toxins July 26th, 2016

Attosecond physics: Mapping electromagnetic waveforms July 25th, 2016

XEI Scientific Partners with Electron Microscopy Sciences to Promote and Sell its Products in North and South America July 25th, 2016

NanoNews-Digest
The latest news from around the world, FREE




  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project







Car Brands
Buy website traffic