Featured Research

from universities, journals, and other organizations

Assessing an object's consistency without touching it

Date:
June 25, 2012
Source:
CNRS (Délégation Paris Michel-Ange)
Summary:
Two teams of researchers have succeeded in evaluating the rigidity of a material … without touching it! To achieve this feat, physicists placed a liquid -- where they created a very weak, nanometric scale flow –- between the probed object and the “tester”. This technique, derived from the latest advances in nano-mechanics, has the advantage of being non-invasive and therefore non-destructive and could significantly improve the testing and analysis of thin, fragile objects such as bubbles or cells.

Close up of the Pyrex sphere and Pyrex plane on which the nanometric scale elastic film is deposited. The small drop of liquid that serves as a probe is visible.
Credit: Copyright Richard Villey and Frédéric Restagno

Two teams of researchers have succeeded in evaluating the rigidity of a material … without touching it! To achieve this feat, physicists from the Laboratoire de Physique de la Matière Condensée et des Nanostructures (CNRS / Université Claude Bernard Lyon 1) and the Laboratoire de Physique des Solides (Université Paris-Sud / CNRS) placed a liquid–where they created a very weak, nanometric scale flow–between the probed object and the “tester”. This technique, derived from the latest advances in nano-mechanics, has the advantage of being non-invasive and therefore non-destructive and could significantly improve the testing and analysis of thin, fragile objects such as bubbles or cells.

This work is published on-line on June 18, 2012 on the website of the journal Physical Review Letters.

A simple way of determining whether a body is hard or soft is to touch it with a harder object. The problem with this technique is that it can destroy the item, especially if it is extremely fragile like a bubble or a living cell. Developing a less invasive alternative was therefore vital. To assess the rigidity of an object without touching it, the team of physicists had envisaged blowing on it delicately to check whether this flow of air deformed the material or not. But precisely controlling a flow of air is difficult on account of the vortexes that can form in the air. Hence the idea of using an easier-to-control “nano-flow” of fluid instead.

The researchers tested their technique on a thin elastomer (rubber) film, only several hundreds of nanometers (1) thick. In concrete terms, they placed the film on a rigid glass support and immersed the lot in a mixture of water and glycerol. They then created a very slight displacement of the liquid, near to the film. To generate this nano-flow, the physicists, and more particularly Samuel Leroy who was then working on his PhD at LPMCN (2), had to use a special device, developed in 2000 in the same laboratory (3). It comprises in particular a millimetric Pyrex (special glass) sphere, attached to a rod, which can be finely moved with what is known as a “piezoelectric ceramic” system. It is precisely this tiny glass bead that allows a nano-flow to be created at the surface of an object.

When the sphere comes up very close to the material (0.000001 meters), it pushes the liquid towards the object. This nano-flow generates a very slight pressure on the surface of the material. This force deforms the film very slightly, if it is flexible. On the other hand, if the tested object is completely rigid, the film remains unchanged.

The two teams also discovered that their method can be used to measure the rigidity of an array of bubbles, an element so fragile that touching it would mean destroying it! It is the first time that the possibility of measuring the elastic properties of an object using a nano-flow of fluid has been demonstrated. This initial work opens the way to a new nanometric-scale imaging technique for observing the elastic properties of very thin or thicker objects.

Notes:
(1) 1 nm = 0.000000001 m
(2) Laboratoire de Physique de la Matière Condensée et des Nanostructures (CNRS / Université Claude Bernard Lyon 1)
(3) Apparatus developed during the PhD work of Frédéric Restagno, under the supervision of Elisabeth Charlaix, currently working at the Laboratoire Interdisciplinaire de Physique (CNRS / Université Grenoble 1)


Story Source:

The above story is based on materials provided by CNRS (Délégation Paris Michel-Ange). Note: Materials may be edited for content and length.


Journal Reference:

  1. Samuel Leroy, Audrey Steinberger, Cécile Cottin-Bizonne, Frédéric Restagno, Liliane Léger and Elisabeth Charlaix. Hydrodynamic interaction between a spherical particle and an elastic surface: A gentle probe for soft thin films. Physical Review Letters, 18 June 2012

Cite This Page:

CNRS (Délégation Paris Michel-Ange). "Assessing an object's consistency without touching it." ScienceDaily. ScienceDaily, 25 June 2012. <www.sciencedaily.com/releases/2012/06/120625064436.htm>.
CNRS (Délégation Paris Michel-Ange). (2012, June 25). Assessing an object's consistency without touching it. ScienceDaily. Retrieved September 16, 2014 from www.sciencedaily.com/releases/2012/06/120625064436.htm
CNRS (Délégation Paris Michel-Ange). "Assessing an object's consistency without touching it." ScienceDaily. www.sciencedaily.com/releases/2012/06/120625064436.htm (accessed September 16, 2014).

Share This



More Matter & Energy News

Tuesday, September 16, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

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
Manufacturer Prints 3-D Car In Record Time

Manufacturer Prints 3-D Car In Record Time

Newsy (Sep. 15, 2014) — Automobile manufacturer Local Motors created a drivable electric car using a 3-D printer. Printing the body only took 44 hours. Video provided by Newsy
Powered by NewsLook.com
Refurbished New York Subway Tunnel Unveiled After Sandy Damage

Refurbished New York Subway Tunnel Unveiled After Sandy Damage

Reuters - US Online Video (Sep. 15, 2014) — New York officials unveil subway tunnels that were refurbished after Superstorm Sandy. Nathan Frandino reports. Video provided by Reuters
Powered by NewsLook.com
Frustration As Drone Industry Outpaces Regulation In U.S.

Frustration As Drone Industry Outpaces Regulation In U.S.

Newsy (Sep. 14, 2014) — U.S. firms worry they’re falling behind in the marketplace as the FAA considers how to regulate commercial drones. 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:
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