Navigation Links
NIST shows ultrasonically propelled nanorods spin dizzyingly fast
Date:7/22/2014

Vibrate a solution of rod-shaped metal nanoparticles in water with ultrasound and they'll spin around their long axes like tiny drill bits. Why? No one yet knows exactly. But researchers at the National Institute of Standards and Technology (NIST) have clocked their speedand it's fast. At up to 150,000 revolutions per minute, these nanomotors rotate 10 times faster than any nanoscale object submerged in liquid ever reported.

The discovery of this dizzying rate has opened up the possibility that they could be used not only for moving around inside the bodythe impetus for the researchbut also for high-speed machining and mixing.

Scientists have been studying how to make nanomotors move around in liquids for the past several years. A group at Penn State looking for a biologically friendly way to propel nanomotors first observed that metal nanorods were moving and rotating in response to ultrasound in 2012. Another group at the University of California San Diego then directed the metal rods' forward motion using a magnetic field. The Penn State group then demonstrated that these nanomotors could be propelled inside of a cancer cell.

But no one knew why or how fast the nanomotors were spinning. The latter being a measurement problem, researchers at NIST worked with the Penn State group to solve it.

"If nanomotors are to be used in a biological environment, then it is important to understand how they interact with the liquid and objects around them," says NIST project leader Samuel Stavis. "We used nanoparticles to trace the flow of water around the nanomotors, and we used that measurement to infer their rate of rotation. We found that the nanomotors were spinning surprisingly rapidly."

The NIST team clocked the nanomotors' rotation by mixing the 2-micrometer-long, 300-nanometer-wide gold rods with 400-nanometer-diameter polystyrene beads in water and putting them between glass and silicon plates with a speaker-type shaker beneath. They then vibrated the shaker at an ultrasonic tone of 3 megahertzmuch too high for you or your dog to hearand watched the motors and beads move.

As the motors rotate in water, they create a vortex around them. Beads that get close get swept up by the vortex and swirl around the rods. By measuring how far the beads are from the rods and how fast they move, the group was able to work out how quickly the motors were spinningwith an important caveat.

"The size of the nanorods is important in our measurements" says NIST physicist Andrew Balk. "We found that even small variations in the rod's dimensions cause large measurement uncertainties, so they need to be fabricated as uniformly as possible for future studies and applications."

According to the researchers, the speed of the nanomotors' rotation seems to be independent of their forward motion. Being able to control the "speed and feed" of the nanomotors independently would open up the possibility that they could be used as rotary tools for machining and mixing.

Future avenues of research include trying to discover exactly why the motors rotate and how the vortex around the rods affects their interactions with each other.


'/>"/>

Contact: Mark Esser
mark.esser@nist.gov
301-975-8735
National Institute of Standards and Technology (NIST)
Source:Eurekalert  

Related biology technology :

1. DNA Test from DNA Spectrum Shows Heritage Like a Map of the Past
2. METTLER TOLEDO Shows How Tunable Diode Lasers (TDLs) Can Be Installed Where No TDLs Have Gone Before
3. Studies Show Pterostilbene Shows Promise for Anti-Aging and Maintaining Healthy Brain
4. Study shows how water dissolves stone, molecule by molecule
5. Clinical trial shows tongue-controlled wheelchair outperforms popular wheelchair navigation system
6. India Shows Commitment to Pharma Excellence at CPhI Worldwide 2013
7. Study shows over 200 mobile apps related to dermatology
8. Novel topological crystalline insulator shows mass appeal
9. Photonics Pros Love Their Work, New SPIE Survey Shows
10. Research Shows That SurePure Technology Offers Alternative to Thermal Pasteurization of Human Breast Milk
11. MedReps.com Report Shows Biotech Workers Earn the Most in Medical Sales
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
NIST shows ultrasonically propelled nanorods spin dizzyingly fast
(Date:2/21/2017)... 2017 /PRNewswire/ - SQI Diagnostics Inc. ("SQI" or the "Company") (TSX-V: ... the three months ended December 31, 2016. ... and diagnostics company that develops and commercializes proprietary technologies and ... ... the commercial milestones achieved in fiscal 2016," said Andrew ...
(Date:2/21/2017)... ... February 21, 2017 , ... Genedata, ... development (R&D), today announced the establishment of Genedata Limited as a new subsidiary ... a recognized expert in life science informatics. Creating the UK subsidiary reinforces Genedata’s ...
(Date:2/21/2017)... ... February 21, 2017 , ... ... Treximo will pair its $200M operational capacity with its strategic internal leadership ... in areas affecting quality and operational management. With office locations in ...
(Date:2/21/2017)... BOTHELL, Wash. and VANCOUVER, British Columbia ... OGXI ) today announced that apatorsen results from ... American Society of Clinical Oncology (ASCO) 2017 Genitourinary Cancers Symposium, ... Orlando . Clinical data from trials in bladder ... outcomes when administered in combination with standard-of-care treatments. ...
Breaking Biology Technology:
(Date:1/26/2017)... , Jan. 26, 2017  Acuity Market Intelligence ... Biometrics and Digital Identity".  Acuity characterizes 2017 as ... when increased adoption reflects a new understanding of ... "Biometrics and digital identity are often perceived ... Maxine Most , Principal of Acuity Market intelligence. ...
(Date:1/23/2017)... -- The latest mobile market research from Acuity Market Intelligence ... quarterly average price of a biometric smartphone decreased from ... There are now 120 sub-$150 models on the market ... 28 a year ago at an average price of ... , Acuity Market Intelligence Principal, "Biometric Smartphones are a ...
(Date:1/18/2017)... Jan. 18, 2017  In vitro diagnostic (IVD) companies ... and acquisitions (M&A), and Kalorama Information expects that trend ... have been shifting. Generally, uncertainty in reimbursement and healthcare ... U.S. has changed the acquisitions landscape. Instead of looking ... companies buying partners outside of their home country and ...
Breaking Biology News(10 mins):