Navigation Links
Fabrication method can affect the use of block copolymer thin films
Date:5/3/2012

A new study by a team including scientists from the National Institute of Standards and Technology (NIST) indicates that thin polymer films can have different properties depending on the method by which they are made. The results* suggest that deeper work is necessary to explore the best way of creating these films, which are used in applications ranging from high-tech mirrors to computer memory devices.

Thin films spread atop a surface have many applications in industry. Inexpensive organic solar cells might be made of such films, to name one potential use. Typically they're made by dissolving the polymer, and then spreading a small amount of the liquid out on a surface, called a substrate. The solution becomes a film as the solvent dries and the remainder solidifies. But as this happens, stresses develop within the film that can affect its structure.

Manufacturers would like to know more about how to control these stresses to ensure the film does what they want. But scientists who study film formation often use a different method of casting films than a manufacturer would. One method used in industry is "flow coating"similar to spreading frosting across a cake. Another method is "spin casting"placing a drop of liquid on a substrate that spins rapidly and spreads the droplet out evenly by centrifugal force. Both methods create smooth films generally, but the team decided to examine whether the two methods create different effects in finished films consisting of a self-assembling block copolymer.

"It's an important question because some proposed applications intend to take advantage of these effects," Douglas says.

The team's comparison led to results that surprised them. Although the rapid spinning of spin casting is very dynamic, suggesting it would convey more stress to the resulting film, it actually led to fewer residual stresses than flow coating did. As previous studies have shown that leftover solvent can lead to stresses in the film, the team's new theory is that because the solvent evaporates from the developing film more slowly in flow coating, this solvent discourages the film solids from arranging themselves into the equilibrium structure.

For one example, the practical benefits of this understanding could help manufacturers who propose making computer memory devices from thin films in which the solids arrange themselves as tiny cylinders in the film. Such devices would require the cylinders to stand on end, not lay down flat.

"We find we can get them to stand up much more easily with one casting method than another," Douglas says. "If we can get better results simply by varying the mode of film casting, we need to explore more deeply what happens when you make films by different methods."


'/>"/>

Contact: Chad Boutin
boutin@nist.gov
301-975-4261
National Institute of Standards and Technology (NIST)
Source:Eurekalert  

Related biology technology :

1. Graphene films clear major fabrication hurdle
2. New graphene fabrication method uses silicon carbide templates to create desired growth
3. UCLA team reports scalable fabrication of self-aligned graphene transistors, circuits
4. Heated AFM tip allows direct fabrication of ferroelectric nanostructures on plastic
5. RapidX250 Rapid Prototype Tool for Micro Fabrication of Microfluidics, MEMs and Medical Devices
6. Microfabrication breakthrough could set piezoelectric material applications in motion
7. PerkinElmer Expertise and Solutions Integral to Food Safety Monitoring for the Beijing Games : Methods, Applications Expertise and Instrumentation Deployed in Mobile Laboratory
8. UC Riverside researcher develops novel method to grow human embryonic stem cells
9. SpectraScience Awarded Patent for Its Optical Biopsy System and Methods for Tissue Diagnosis
10. Waters Publishes Rapid and Specific Method of Detection for Melamine in Infant Formula and Liquid Milk, in Support of Chinas Ministry of Science and Technology
11. Stretching silicon: A new method to measure how strain affects semiconductors
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Fabrication method can affect the use of block copolymer thin films
(Date:5/2/2016)... ... May 02, 2016 , ... F.E.E.D. Co., the Feline ... their revolutionary, veterinarian-designed product for indoor cats. The NoBowl Feeding System replaces the ... food the way nature intended. NoBowls make cats happy and healthy. , Since ...
(Date:4/29/2016)... CO (PRWEB) , ... April 29, 2016 , ... ... addressing the necessary fundamentals to transform technology into a viable company, CereScan’s CEO, ... growth. Mr. Kelley, a recognized leader and mentor in the Denver area ...
(Date:4/28/2016)... , April 28, 2016 ... reports the Company,s CEO  was featured in an ... Enter When VCs Fear To Tread: http://www.lifescienceleader.com/doc/accelerators-enter-when-vcs-fear-to-tread-0001 ... magazine is an essential business journal ... from emerging biotechs to Big Pharmas. Their content ...
(Date:4/27/2016)... , ... April 27, 2016 , ... Cambridge Semantics, ... semantic web technology, today announced that it has been named to The Silicon Review’s ... financial services and other markets, Cambridge Semantics serves the needs of end users facing ...
Breaking Biology Technology:
(Date:3/22/2016)... , PROVO and ... Newborn Screening Ontario (NSO), which operates the highest sample ... molecular testing, and Tute Genomics and UNIConnect, leaders in ... respectively, today announced the launch of a project to ... (NGS) testing panel. NSO has been ...
(Date:3/15/2016)... New York , March 15, 2016 ... new market report published by Transparency Market Research "Digital Door ... Trends and Forecast 2015 - 2023," the global digital door ... US$ 731.9 Mn in 2014 and is forecast to grow ... 2023. Growth of micro, small and medium enterprises (MSMEs) across ...
(Date:3/11/2016)... 2016 http://www.apimages.com ) - --> ... available at AP Images ( http://www.apimages.com ) - ... to produce the new refugee identity cards. DERMALOG will be unveiling ... in Hanover next week.   --> ... used to produce the new refugee identity cards. DERMALOG will be ...
Breaking Biology News(10 mins):