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:1/19/2017)... ... January 18, 2017 , ... ... of Health (NIH) to update its Data Sharing Policy. Specifically, the nation’s leading ... grant applications subject to the existing policy. AMIA recommended that NIH earmark funding ...
(Date:1/19/2017)... ... January 19, 2017 , ... FireflySci Inc. is a go-getter ... The tremendous growth is accounted to two main factors. The first is the ... network of vendors supplying FireflySci products all around the world. , 2016 was a ...
(Date:1/19/2017)... NEW YORK , Jan. 18, 2017 /PRNewswire/ ... expected to reach USD 92.9 billion by 2025, ... Research, Inc. Pharmaceutical industry has been adaptive of ... functions as early as 2002. Among the services ... the forerunners. For instance, Johnson & Johnson was ...
(Date:1/19/2017)... PLAINVIEW, N.Y. , Jan. 18, 2017 ... pathology services, announces the formation of an Executive Committee ... 2017 and beyond. John Cucci , ... been promoted from Director of Business Development to ... in 2015, Mr. Cucci served in senior sales leadership ...
Breaking Biology Technology:
(Date:1/11/2017)... 11, 2017  Michael Johnson, co-founder of Visikol Inc. a company ... has been named to the elite "Forbes 30 Under 30" list ... 600 people in 20 fields nationwide to be recognized as a ... applicants were selected. ... He is currently a PhD candidate at Rutgers University. ...
(Date:1/4/2017)...  CES 2017 – Valencell , the leading ... the launch of two new versions of its ... sensor modules that incorporate the best of Valencell,s ... The two new designs include Benchmark BE2.0, a ... Benchmark BW2.0, a 2-LED version of its original ...
(Date:12/20/2016)... N.C. and GENEVA, Dec, 20, 2016 /PRNewswire/ ... biometric data sensor technology, and STMicroelectronics ... the spectrum of electronics applications, announced today the ... development kit for biometric wearables that includes ST,s ... with Valencell,s Benchmark™ biometric sensor system. ...
Breaking Biology News(10 mins):