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www.us-
tech.com Huntron’s Transmogrification
New Solar Cell Self-Repairs
Continued from page 1
Discovery Park. “I think our approach offers
promise for indus trialization, but we’re still in the basic research stage,” he said.
Transporting Electrons Photoelectrochemical cells con-
One Probe... The NEW Huntron Access DH
Huntron is proud to introduce our fourth generation Robotic Prober - the Huntron Access DH. Te dual head Access DH Prober has an open architecture design that allows you to automate Huntron Tracker® ASA technology or other main line test instruments.
Huntron Access Prober DH is a fixtureless platform designed for economical, automated testing of CCAs. Te open architecture platform combined with two independent heads provides a flexible solution for accessing densely packed surface-mount components as well as through-hole devices on the most complex boards. Te probe head configuration is designed to be easily configured to your test requirements.
True Point-to-point Testing Huntron Access DH
Te Access DH can be used with traditional Huntron Tracker products or be configured to work with conventional test instruments (oscilloscopes, spectrum analyzers, LCR meter, etc.) and specialized test cards such as Boundary Scan. Te Access DH design allows for a plug and play approach to automating manual guided probe applications.
Applications - - Huntron Power-off ASA - RF Near Field Signature Analysis - Boundary Scan - Guided Probe Measurements
Adaptable by Design
Te ability to customize the Access DH probe head assemblies combined with software created using the Huntron Workstation SDK provides many integration and customization opportunities. Te probe head design includes pre-wired intercon- nections for adding built-in USB, Firewire or Ethernet instrumentation at the head.
Huntron’s transmogrification, 34 years and counting...
Call or click, 800-426-9265 or
www.huntron.com.
- Point-to-point Component Measurements - Stimulus/Response Measurements - Multiple Probe Arrays and more...
... or Two?
trans·mogri·fi·cation (trns-mgr-f-kshn) n. tr.v. trans·mog·ri·fy, trans·mog·ri·fied, trans·mog·ri·fy·ing, trans·mog·ri·fies To change into a different shape or form, especially one that is fantastic or unique. [Origin unknown.]
vert sunlight into electricity and use an electrolyte to transport electrons and create the current. The cells con- tain light-absorbing dyes called chrom ophores, chlorophyll-like mole- cules that degrade due to exposure to sunlight. “The critical disadvantage of
conventional photoelectrochemical cells is this degradation,” Choi said. The new technology overcomes
this problem just as nature does — by continuously replacing the photo- damaged dyes with new ones. “This sort of self-regeneration is done in plants every hour,” Choi said. The new concept could make
possible an innovative type of photo- electrochemical cell that continues operating at full capacity indefinite- ly, as long as new chromophores are added.
Published Findings The findings were detailed in a
November presentation during the International Mechanical Engin - eering Congress and Exhibition in Vancouver. The concept also was unveiled in an online article featured on the Web site for SPIE, an interna- tional society for optics and photonics. The talk and article were writ-
ten by Choi, doctoral students Benjamin A. Baker and Tae-Gon Cha, and undergraduate students M. Dane Sauffer and Yujun Wu. The carbon nanotubes work as a
platform to anchor strands of DNA. The DNA is engineered to have spe- cific sequences of building blocks called nucleotides, enabling them to recognize and attach to the chro- mophores. “The DNA recognizes the dye
molecules, and then the system spon- taneously self-assembles,” Choi said. When the chromophores are
ready to be replaced, they might be removed by using chemical processes or by adding new DNA strands with different nucleotide sequences, kick- ing off the damaged dye molecules. New chromophores would then be added. Two elements are critical for the technology to mimic nature’s self- repair mechanism: molecular recog- nition and thermodynamic metasta- bility, or the ability of the system to continuously be dissolved and reassembled. The research is an extension of
work that Choi collaborated on with researchers at the Massachusetts Institute of Technology and the University of Illinois. The earlier work used biological chromophores taken from bacteria, and findings were detailed in a research paper published in November in the journal “Nature Chemistry. However, using natural chro-
mophores is difficult, and they must be harvested and isolated from bacte- ria, a process that would be expen- sive to reproduce on an industrial scale, Choi said. “So instead of using biological
chromophores, we want to use syn- thetic ones made of dyes called por- phyrins,” he said. Info:
http://spie.org/ x41475.xml -
? ArticleID=x41475 or
www.nature - . c om/ nchem/ j ournal /v2/n11/ - abs/
nchem.822.html r
April, 2011
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