Navigation Links
Building a smaller, lighter future: Understanding polymer behaviors below 1 nanometer
Date:10/5/2010

Kyoto, Japan -- Knowing how to build nanosized assemblies of polymers (long molecular chains) holds the key to improving a broad range of industrial processes, from the production of nanofibers, filters, and new materials to the manufacture of low-energy, nanoscale circuits and devices. A recent paper in Nature Communications sheds light on key behaviors of polymers in specially engineered confined spaces, opening the door to a level of control that has previously been impossible.

Scientists in Japan at Kyoto University and Nagoya University have succeeded in manufacturing custom-designed sub-nanometer scale channels, or pores, which can be manipulated to trap polymers and allow researchers to observe how these chains respond to temperature changes. Previously this level of observation was not possible, and hence much about polymer behaviors in subnanometer spaces -- in particular thermal transitions -- was unknown.

The technique uses specially designed substances known as porous coordination polymers (PCPs), which are notable for the high-degree to which their pore sizes and other characteristics can be controlled.

"PCPs allow us to design cages in which to trap specific molecules," explains lead scientist Dr. Takashi Uemura of Kyoto University's Graduate School of Engineering. "In this case, polyethylene glycol molecules -- PEGs -- can be accommodated in the cages similarly to the way in which sea eels hide in holes. In open water there is no order to their swimming. But in cylindrical pipes, they prefer to arrange themselves linearly in groups. Polymer chains do this as well, becoming orderly assembled in the PCP channels."

In this case, the PCP channels were precisely tuned to control their size and inner surface characteristics, allowing the research team to directly observe how the polymers behaved. This led to the unexpected finding that the transition temperature -- in this case, melting point -- of confined PEGs decreased as their molecular weight -- length in this instance -- increased.

"This was exactly the opposite of what we had observed in bulk, that is, 'free' PEG," elaborates Dr. Susumu Kitagawa, deputy director of Kyoto University's Institute for Integrated Cell-Material Sciences (iCeMS). "We believe this to be the result of destabilization of the PEG chains under confinement. Instability increases together with chain length."

Understanding such minute details of the behaviors of nanoconfined polymers gives rise to the possibility of future breakthroughs in nanoscale manufacturing based on assemblies of small numbers of polymer chains, which may in turn be used to fabricate a wide range of new materials.


'/>"/>

Contact: Yutaka Iijima
yutaka-iijima@icems.kyoto-u.ac.jp
Institute for Integrated Cell-Material Sciences, Kyoto University
Source:Eurekalert

Related biology technology :

1. PointCross Releases Catalyst for Building Business-Ready SharePoint Solutions in 1/10th the Time
2. Photo-catalytic, self cleaning coating for building exteriors
3. Techstreet Launches BuildingBlocks Utility for Industry Standards Saving Time and Increasing Productivity for Engineers
4. Arts Way Manufacturing Announces Launch of New Web Site For Arts Way Scientific - Buildings For Science
5. Secret of sandcastle construction could help revive ancient building technique, researchers say
6. Building better bone replacements with bacteria
7. Hendrick Construction Renovates USC Science Building
8. RPJ Housings Rebuilding Together Event Brings Estimated $300,000 Worth Of Volunteer Labor to Northern VA
9. Building Biotech Technology Transfer Opportunities: Sponsor and Developer Strategies for Success
10. Penn collaboration leads to simpler method for building varieties of nanocrystal superlattices
11. New silicon-germanium nanowires could lead to smaller, more powerful electronic devices
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:10/11/2017)... 2017  VMS BioMarketing, a leading provider of patient support ... Nurse Educator (CNE) network, which will launch this week. The ... health care professionals to enhance the patient care experience by ... other health care professionals to help women who have been ... ...
(Date:10/11/2017)... ... 2017 , ... A new study published in Fertility and ... in vitro fertilization (IVF) transfer cycles. The multi-center matched cohort study ... comparing the results from the fresh and frozen transfer cohorts, the authors of ...
(Date:10/10/2017)... Angeles, CA (PRWEB) , ... ... ... Inc., a development-stage cancer-focused pharmaceutical company advancing targeted antibody-drug conjugate (ADC) therapeutics, ... uses of targeted HPLN (Hybrid Polymerized Liposomal Nanoparticle), a technology developed in ...
(Date:10/10/2017)... , Oct. 10, 2017 International research firm Parks Associates ... will speak at the TMA 2017 Annual Meeting , October 11 ... in the residential home security market and how smart safety and security ... Parks Associates: ... "The residential security ...
Breaking Biology Technology:
(Date:4/13/2017)... 13, 2017 UBM,s Advanced Design and Manufacturing ... feature emerging and evolving technology through its 3D Printing ... run alongside the expo portion of the event and ... demonstrations focused on trending topics within 3D printing and ... manufacturing event will take place June 13-15, 2017 at the ...
(Date:4/11/2017)... , April 11, 2017 NXT-ID, Inc. ... technology company, announces the appointment of independent Directors Mr. ... to its Board of Directors, furthering the company,s corporate governance ... Gino ... we look forward to their guidance and benefiting from their ...
(Date:4/4/2017)... NEW YORK , April 4, 2017   ... solutions, today announced that the United States Patent and ... The patent broadly covers the linking of an iris ... the same transaction) and represents the company,s 45 th ... our latest patent is very timely given the multi-modal ...
Breaking Biology News(10 mins):