Nanotechnology Now

Our NanoNews Digest Sponsors





Heifer International

Wikipedia Affiliate Button


android tablet pc

Home > Press > Origins and uses of wrinkles, creases, folds

 Three ruga states and how they form	A phase diagram shows the amount of compressive strain needed to create wrinkles, creases and folds in rubbery materials. The purple area denotes the wrinkle state and the aqua areas are two crease states. The spot marked “R” denotes folding.	Credit: Kim lab/Brown University
Three ruga states and how they form A phase diagram shows the amount of compressive strain needed to create wrinkles, creases and folds in rubbery materials. The purple area denotes the wrinkle state and the aqua areas are two crease states. The spot marked “R” denotes folding.

Credit: Kim lab/Brown University

Abstract:
New research into the origins of — and structural differences between — wrinkles, creases, and folds could have applications in many fields, from flexible electronic devices to dermatology to flexible sheets that become sticky when stretched. Findings from a Brown University research group appear in Proceedings of the Royal Society A.

Origins and uses of wrinkles, creases, folds

Providence, RI | Posted on July 18th, 2013

Engineers from Brown University have mapped out the amounts of compression required to cause wrinkles, creases, and folds to form in rubbery materials. The findings could help engineers control the formation of these structures, which can be useful in designing nanostructured materials for flexible electronic devices or surfaces that require variable adhesion.

"When a rubbery material is compressed and reaches a critical load, it experiences instability and forms surface patterns like wrinkles, creases, or folds," said Mazen Diab, a postdoctoral researcher in Brown's School of Engineering and the paper's first author. "We're studying how each of those states forms."

While most of us might use the terms wrinkle, crease, and fold almost interchangeably, engineers recognize distinct properties in each of those states. As defined by the Brown researchers, the wrinkle state is when peaks and troughs start to form on the surface, like waves on the ocean. The crease state is when a distinctly sharp groove is formed on the surface. A fold occurs when the areas on either side of the wrinkle trough begin to touch, forming hollow channels beneath the surface plane of the material.

The researchers refer to these states collectively as "ruga" states, a term originating from Latin and often used in anatomy to describe wrinkle formations in the body such as on the stomach or the roof of the mouth.

Each ruga state could have different implications in a design setting. In a flexible circuit board, for example, wrinkles might be acceptable but creases or folds could cause short circuits. Engineers might use creases or folds to control the adhesive properties of a surface. These structures can hide the area of a sticky surface in troughs, making it less likely to stick. Stretching the surface brings the stickiness back. Folds could be useful in trapping large molecules or nanoparticles and in transporting fluids.

The idea behind this latest research is to understand at what points each ruga state forms, helping engineers to better utilize them. To do that, the researchers used a mathematical model that simulates the deformation characteristics of a layered rubbery material with its elastic property varying with depth from the surface. The result was a phase diagram that pinpoints the precise amounts of compression required to form each ruga state.

The diagram identifies two crease states along with a wrinkle state and a fold state. A setback crease happens when a wrinkle progresses to a crease under additional strain. An instantaneous crease happens when the initial strain is sufficient to skip the wrinkle phase.

"The phase diagram shows the compressive strain needed to form all these ruga states and shows the transitions from one state to another," said Diab, who works in the lab of professor Kyung-Suk Kim in Brown's School of Engineering. "Engineers can use it as a guide to get the shapes they want in different length scales."

Beyond material science, Kim says the work will help scientists "to fathom natural processes observed in broad scales from mountain folds to skin creases and folds of micro organs in biology."

The research is published in Proceedings of the Royal Society A. Also contributing to the paper were Teng Zhang, Ruike Zhao, and Huajian Gao. The work was supported by the Korea Institute of Machinery and Materials, the Korea Institute of Science and Technology and the U.S. National Science Foundation (DMR-0520651).

####

For more information, please click here

Contacts:
Kevin Stacey

401-863-3766

Copyright © Brown University

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 paper:

Related News Press

News and information

Measuring the Smallest Magnets July 28th, 2014

WITec to host the 11th Confocal Raman Imaging Symposium from September 29th - October 1st in Ulm, Germany July 28th, 2014

FEI adds Phase Plate Technology and Titan Halo TEM to its Structural Biology Product Portfolio: New solutions provide the high-quality imaging and contrast necessary to analyze the 3D structure of molecules and molecular complexes July 28th, 2014

Production of Toxic Gas Sensor Based on Nanorods July 28th, 2014

Flexible Electronics

Nanoengineers Develop Basis for Electronics That Stretch at the Molecular Level May 8th, 2014

Energy device for flexible electronics packs a lot of power May 7th, 2014

Flexible battery, no lithium required: Rice University lab creates thin-film battery for portable, wearable electronics April 28th, 2014

Transparent Conductive Films and Sensors Are Hot Segments in Printed Electronics: Start-ups in these fields show above-average momentum, while companies working on emissive displays such as OLED are fading, Lux Research says April 17th, 2014

Govt.-Legislation/Regulation/Funding/Policy

Seeing is bead-lieving: Rice University scientists create model 'bead-spring' chains with tunable properties July 28th, 2014

Stanford team achieves 'holy grail' of battery design: A stable lithium anode - Engineers use carbon nanospheres to protect lithium from the reactive and expansive problems that have restricted its use as an anode July 27th, 2014

New imaging agent provides better picture of the gut July 25th, 2014

A*STAR and industry form S$200M semiconductor R&D July 25th, 2014

Nanomedicine

FEI adds Phase Plate Technology and Titan Halo TEM to its Structural Biology Product Portfolio: New solutions provide the high-quality imaging and contrast necessary to analyze the 3D structure of molecules and molecular complexes July 28th, 2014

New imaging agent provides better picture of the gut July 25th, 2014

Scientists Test Nanoparticle "Alarm Clock" to Awaken Immune Systems Put to Sleep by Cancer July 25th, 2014

Researchers create vaccine for dust-mite allergies Main Page Content: Vaccine reduced lung inflammation to allergens in lab and animal tests July 22nd, 2014

Discoveries

Seeing is bead-lieving: Rice University scientists create model 'bead-spring' chains with tunable properties July 28th, 2014

Measuring the Smallest Magnets July 28th, 2014

Production of Toxic Gas Sensor Based on Nanorods July 28th, 2014

Stanford team achieves 'holy grail' of battery design: A stable lithium anode - Engineers use carbon nanospheres to protect lithium from the reactive and expansive problems that have restricted its use as an anode July 27th, 2014

Materials/Metamaterials

Seeing is bead-lieving: Rice University scientists create model 'bead-spring' chains with tunable properties July 28th, 2014

Silicene Labs Announces the Launch of 2D Materials Briefing Book™ and 2D Materials Road-Heat Map™: Contributors Include One of the World's Foremost 2D Materials Scientists July 25th, 2014

Silicene Labs Announces the Launch of Patent-Pending, 2D Materials Composite Index™ : The Initial 2D Materials Composite Index™ for Q2 2014 Is: 857.3; Founders Include World-Renowned Physicist and Seasoned Business and IP Professionals July 24th, 2014

Iranian Scientists Produce Transparent Nanocomposite Coatings with Longer Lifetime July 24th, 2014

Announcements

Measuring the Smallest Magnets July 28th, 2014

WITec to host the 11th Confocal Raman Imaging Symposium from September 29th - October 1st in Ulm, Germany July 28th, 2014

FEI adds Phase Plate Technology and Titan Halo TEM to its Structural Biology Product Portfolio: New solutions provide the high-quality imaging and contrast necessary to analyze the 3D structure of molecules and molecular complexes July 28th, 2014

Production of Toxic Gas Sensor Based on Nanorods July 28th, 2014

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

Seeing is bead-lieving: Rice University scientists create model 'bead-spring' chains with tunable properties July 28th, 2014

Production of Toxic Gas Sensor Based on Nanorods July 28th, 2014

Stanford team achieves 'holy grail' of battery design: A stable lithium anode - Engineers use carbon nanospheres to protect lithium from the reactive and expansive problems that have restricted its use as an anode July 27th, 2014

Iranian Scientists Produce Reusable Nanoadsorbent to Detect Sulfamide in Chicken July 27th, 2014

Research partnerships

Breakthrough laser experiment reveals liquid-like motion of atoms in an ultra-cold cluster: University of Leicester research team unlocks insights into creation of new nano-materials July 25th, 2014

A*STAR and industry form S$200M semiconductor R&D July 25th, 2014

A Crystal Wedding in the Nanocosmos July 23rd, 2014

Penn Study: Understanding Graphene’s Electrical Properties on an Atomic Level July 22nd, 2014

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







© Copyright 1999-2014 7th Wave, Inc. All Rights Reserved PRIVACY POLICY :: CONTACT US :: STATS :: SITE MAP :: ADVERTISE