Nanotechnology Now







Heifer International

Wikipedia Affiliate Button


DHgate

Home > Press > A new concept for manufacturing wrinkling patterns on hard-nano-film/soft-matter-substrate

This image shows a set of S-shaped curves with the same phase. (a) The parallel distance 800 μm; (b) the parallel distance 200 μm (aluminum film thickness 200 nm).

Credit: ©Science China Press
This image shows a set of S-shaped curves with the same phase. (a) The parallel distance 800 μm; (b) the parallel distance 200 μm (aluminum film thickness 200 nm).

Credit: ©Science China Press

Abstract:
Wrinkling is a common phenomenon for thin stiff film adhered on soft substrate. Various wrinkling phenomenon has been reported previously. Wu Dan, Yin Yajun, Xie Huimin,et al from Tsinghua University proposed a new method to control wrinkling and buckling of thin stiff film on soft substrate. It is found that the curve pattern on the soft substrate has obvious influence on the wrinkling distribution of the thin film/soft substrate. Their work, entitled "Controlling the surface buckling wrinkles by patterning the material system of hard-nano-film/soft-matter-substrate", was published in SCIENCE CHINA Physics, Mechanics & Astronomy 2014, Vol 57(4) issue.

A new concept for manufacturing wrinkling patterns on hard-nano-film/soft-matter-substrate

Beijing, China | Posted on March 24th, 2014

Wrinkling and buckling at micro-scale are a popular phenomenon in stiff nano-film on compliant substrate due to external stimuli such as thermal mismatch. This feature has many applications in the design and fabrication of flexible electronics and devices, micro-cell arrays, optical gratings, and so on.

Thermal mismatch is one of the important factors which cause the surface buckling of stiff nano-film on compliant substrate. The wrinkling formation mechanism of the stiff film on compliant substrate of Polydimethylsiloxane (PDMS) is illustrated in Figure 1. The PDMS substrate is heated and will be expanded as a result during the deposition of the stiff film. When the deposition is completed, the stiff film is formed on the substrate and the substrate cools down. The contraction of the substrate due to temperature dropping is restricted by the stiff film, for the thermal coefficient of the PDMS substrate is much larger than the stiff film. In accommodating the deformation mismatch between the substrate and the stiff film, interface constraint force is induced consequently. The deformation compatibility causes compressive stress in the stiff film and tensile stress in the compliant PDMS substrate. Once the compressive stress in the stiff film exceeds the critical buckling stress, surface buckling and wrinkling will occur to balance the system.

The wrinkling appears randomly and in disorder in the uniform, continuous and isotropic film under the condition of equally biaxial compressive stress. The orientation ordering of wrinkles induced by isotropic buckling has been studied by simulation method but few works have been reported on how to control the surface wrinkling orientation according to the design specification, which is significant for the design of the flexible electronics. The idea of regulating the orientation and distribution of the wrinkling by patterning the surface of the stiff film/compliant substrate system has been proposed by researchers recently. Various patterns have been designed on the PDMS substrate to control the buckling distribution and orientation. Some progress from recent work has been made in this research.

A photolithography process has been conducted to fabricate the curve patterns on the soft PDMS substrate and then the thin stiff aluminum film is deposited on the soft substrate. A few experimental results have been show in Figure 2 and Figure 3. Through the wrinkling behavior of the thin stiff film/soft substrate by patterning the soft substrate with various curves, the conclusions are summarized: On the concave side of the curve, the wrinkling of the film surface is suppressed to be identified as shielding effect and on the convex side the wrinkling of the film surface is induced to be identified as inductive effect. The shielding and inductive effects make the dis-ordered wrinkling and buckling controllable. This finding may give some new ideas to the designing of the wrinkling pattern of thin stiff film/soft substrate.

####

About Science China Press
Science China Press Co., Ltd. (SCP) is a scientific journal publishing company of the Chinese Academy of Sciences (CAS). For 60 years, SCP takes its mission to present to the world the best achievements by Chinese scientists on various fields of natural sciences researches.

For more information, please click here

Contacts:
Xie Huimin

Copyright © Science China Press

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

See the article: Wu D, Yin YJ, Xie HM, et al. Controlling the surface buckling wrinkles by patterning the material system of hard-nano-film/soft-matter-substrate. SCI CHINA Physics, Mechanics & Astronomy, 2014 Vol.57 (4): 637-643:

Related News Press

Thin films

LAMDAMAP 2015 hosted by the University March 26th, 2015

A new method for making perovskite solar cells March 16th, 2015

Engineers create chameleon-like artificial 'skin' that shifts color on demand March 12th, 2015

News and information

Industrial Nanotech, Inc. Announces Next Large Order from the Oil and Gas Industry March 26th, 2015

Quantum compute this -- WSU mathematicians build code to take on toughest of cyber attacks: Revamped knapsack code offers online security for the future March 26th, 2015

Thousands of atoms entangled with a single photon: Result could make atomic clocks more accurate March 26th, 2015

Square ice filling for a graphene sandwich March 26th, 2015

Flexible Electronics

Haydale Announce Dedicated Graphene Inks Manufacturing Capability March 25th, 2015

Caltech scientists develop cool process to make better graphene March 18th, 2015

Discoveries

Graphene reduces wear of alumina ceramic March 26th, 2015

Quantum compute this -- WSU mathematicians build code to take on toughest of cyber attacks: Revamped knapsack code offers online security for the future March 26th, 2015

Thousands of atoms entangled with a single photon: Result could make atomic clocks more accurate March 26th, 2015

Square ice filling for a graphene sandwich March 26th, 2015

Announcements

Industrial Nanotech, Inc. Announces Next Large Order from the Oil and Gas Industry March 26th, 2015

Quantum compute this -- WSU mathematicians build code to take on toughest of cyber attacks: Revamped knapsack code offers online security for the future March 26th, 2015

Thousands of atoms entangled with a single photon: Result could make atomic clocks more accurate March 26th, 2015

Square ice filling for a graphene sandwich March 26th, 2015

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

Graphene reduces wear of alumina ceramic March 26th, 2015

Quantum compute this -- WSU mathematicians build code to take on toughest of cyber attacks: Revamped knapsack code offers online security for the future March 26th, 2015

Thousands of atoms entangled with a single photon: Result could make atomic clocks more accurate March 26th, 2015

Square ice filling for a graphene sandwich March 26th, 2015

Photonics/Optics/Lasers

Bar-Ilan U. researchers identify 'tipping point' between quantum and classical worlds: Study sheds new light on 'spooky' quantum optics March 24th, 2015

UW scientists build a nanolaser using a single atomic sheet March 24th, 2015

Building shape inspires new material discovery March 24th, 2015

EEE Photonics Society’s Fourth Annual Optical Interconnects Conference Seeks to Bring Together the Latest Advanced Optical Interconnect Technologies, Systems & Architectures for the Next Generation of Supercomputers & Datacenters March 23rd, 2015

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 1999-2015 7th Wave, Inc. All Rights Reserved PRIVACY POLICY :: CONTACT US :: STATS :: SITE MAP :: ADVERTISE