Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Scotch tape finds new use as grasping 'smart material'

21.11.2012
Scotch tape, a versatile household staple and a mainstay of holiday gift-wrapping, may have a new scientific application as a shape-changing "smart material."
Researchers used a laser to form slender half-centimeter-long fingers out of the tape. When exposed to water, the four wispy fingers morph into a tiny robotic claw that captures water droplets.

The innovation could be used to collect water samples for environmental testing, said Babak Ziaie, a Purdue University professor of electrical and computer engineering and biomedical engineering.

The Scotch tape - made from a cellulose-acetate sheet and an adhesive - is uniquely suited for the purpose.

"It can be micromachined into different shapes and works as an inexpensive smart material that interacts with its environment to perform specific functions," he said.

Doctoral student Manuel Ochoa came up with the idea. While using tape to collect pollen, he noticed that it curled when exposed to humidity. The cellulose-acetate absorbs water, but the adhesive film repels water.

"So, when one side absorbs water it expands, the other side stays the same, causing it to curl," Ziaie said.

A laser was used to machine the tape to a tenth of its original thickness, enhancing this curling action. The researchers coated the graspers with magnetic nanoparticles so that they could be collected with a magnet.

"Say you were sampling for certain bacteria in water," Ziaie said. "You could drop a bunch of these and then come the next day and collect them."

Findings will be detailed in a presentation during a meeting of the Materials Research Society in Boston from Sunday (Nov. 25) to Nov. 30. Experiments at Purdue's Birck Nanotechnology Center were conducted by Ochoa, doctoral student Girish Chitnis and Ziaie.

The grippers close underwater within minutes and can sample one-tenth of a milliliter of liquid.

"Although brittle when dry, the material becomes flexible when immersed in water and is restored to its original shape upon drying, a crucial requirement for an actuator material because you can use it over and over," Ziaie said. "Various microstructures can be carved out of the tape by using laser machining. This fabrication method offers the capabilities of rapid prototyping and batch processing without the need for complex clean-room processes."
An animated GIF of the gripper closing is available at https://engineering.purdue.edu/ZBML/img/research/plain-gripper-closing.gif

The materials might be "functionalized" so that they attract specific biochemicals or bacteria in water.

The researchers used Scotch tape to create a tiny grasping claw that collects droplets of water, an innovation could be used to collect water samples for environmental testing. The material, seen here, becomes flexible when exposed to humidity and returns to its original shape when dry. (Manuel Ochoa, Purdue University) A publication-quality image is available at http://news.uns.purdue.edu/images/2012/ziaie-grippers.jpg

Credit: Manuel Ochoa, Purdue University

Writer: Emil Venere, 765-494-4709, venere@purdue.edu

Sources: Babak Ziaie, 765-494-0725, bziaie@purdue.edu

Manuel Ochoa, ochoam@purdue.edu

Related websites:

Babak Ziaie: https://engineering.purdue.edu/ECE/People/profile?resource_id=2839

Birck Nanotechnology Center: http://www.purdue.edu/discoverypark/nanotechnology/

Other animated GIFs using the material to create a mini-Purdue logo:
https://engineering.purdue.edu/ZBML/img/research/pu-tape-1-small.gif
https://engineering.purdue.edu/ZBML/img/research/pu-tape-2-small.gif
IMAGE CAPTION:
The researchers used Scotch tape to create a tiny grasping claw that collects droplets of water, an innovation could be used to collect water samples for environmental testing. The material, seen here, becomes flexible when exposed to humidity and returns to its original shape when dry. (Manuel Ochoa, Purdue University)

A publication-quality image is available at http://news.uns.purdue.edu/images/2012/ziaie-grippers.jpg

IMAGE CAPTION:

The graspers were coated with magnetic particles, which could allow researchers to retrieve the devices in the field by using a magnet. (Manuel Ochoa, Purdue University)

A publication-quality image is available at http://news.uns.purdue.edu/images/2012/ziaie-grippers2.jpg

ABSTRACT

Laser-Micromachined Magnetically-Functionalized Hygroscopic Bilayer: A Low-Cost Smart Material

Manuel Ochoa 1,4, Girish Chitnis 2,4, and Babak Ziaie 1,3,4*

1School of Electrical and Computer Engineering, Purdue University

2School of Mechanical Engineering

3 Weldon School of Biomedical Engineering

4Birck Nanotechnology Center

In this paper, we describe the design, fabrication, and characterization of magnetically functionalized humidity-responsive bilayers. We investigated two different ferrofluid embedded material structures: 1) cellulose-acetate sheet bonded to an acetate-backed adhesive (3M Scotch® GiftWrap Tape) (CA/GWT) and 2) a commercially available acetate-backed adhesive (3M Scotch® MagicTape) (MT). Cantilevers and other mechanical structures such as grippers were fabricated using laser micro-machining and exposed to humidity and magnetic fields. Such bilayers take advantage of the hygroscopic properties of cellulose acetate for their humidity response while simultaneously allowing one to remotely manipulate the structure using a magnetic field. The maximum radius of curvature in a humidity saturated environment for a CA/GWT cantilever (2 mm × 19 mm × 157 µm) was measured to be 7 mm, whereas the MT showed a smaller radius of curvature (

Emil Venere | EurekAlert!
Further information:
http://www.purdue.edu

More articles from Materials Sciences:

nachricht Proteins imaged in graphene liquid cell have higher radiation tolerance
10.12.2018 | INM - Leibniz-Institut für Neue Materialien gGmbH

nachricht High-temperature electronics? That's hot
07.12.2018 | Purdue University

All articles from Materials Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Researchers develop method to transfer entire 2D circuits to any smooth surface

What if a sensor sensing a thing could be part of the thing itself? Rice University engineers believe they have a two-dimensional solution to do just that.

Rice engineers led by materials scientists Pulickel Ajayan and Jun Lou have developed a method to make atom-flat sensors that seamlessly integrate with devices...

Im Focus: Three components on one chip

Scientists at the University of Stuttgart and the Karlsruhe Institute of Technology (KIT) succeed in important further development on the way to quantum Computers.

Quantum computers one day should be able to solve certain computing problems much faster than a classical computer. One of the most promising approaches is...

Im Focus: Substitute for rare earth metal oxides

New Project SNAPSTER: Novel luminescent materials by encapsulating phosphorescent metal clusters with organic liquid crystals

Nowadays energy conversion in lighting and optoelectronic devices requires the use of rare earth oxides.

Im Focus: A bit of a stretch... material that thickens as it's pulled

Scientists have discovered the first synthetic material that becomes thicker - at the molecular level - as it is stretched.

Researchers led by Dr Devesh Mistry from the University of Leeds discovered a new non-porous material that has unique and inherent "auxetic" stretching...

Im Focus: The force of the vacuum

Scientists from the Theory Department of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science (CFEL) in Hamburg have shown through theoretical calculations and computer simulations that the force between electrons and lattice distortions in an atomically thin two-dimensional superconductor can be controlled with virtual photons. This could aid the development of new superconductors for energy-saving devices and many other technical applications.

The vacuum is not empty. It may sound like magic to laypeople but it has occupied physicists since the birth of quantum mechanics.

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

New Plastics Economy Investor Forum - Meeting Point for Innovations

10.12.2018 | Event News

EGU 2019 meeting: Media registration now open

06.12.2018 | Event News

Expert Panel on the Future of HPC in Engineering

03.12.2018 | Event News

 
Latest News

Small but ver­sat­ile; key play­ers in the mar­ine ni­tro­gen cycle can util­ize cy­anate and urea

10.12.2018 | Life Sciences

New method gives microscope a boost in resolution

10.12.2018 | Physics and Astronomy

Carnegie Mellon researchers probe hydrogen bonds using new technique

10.12.2018 | Life Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>