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August 08, 2011 - Volume 89, Number 32
- p. 38
Science & Technology Concentrates
More Science & Technology Concentrates
- Speedier Enantiomeric Excess
- An achiral copper complex grabs an enantiomer and then undergoes a distinctive rotation to quickly give a positive ID
- DESI Tackles Large Proteins
- Mass spec technique known for analyzing small molecules can now be used to analyze proteins as large as 150 kilodaltons
- Solar-Cell Layer Comes Into View
- Microscopy method reveals the location and morphology of electron donor, acceptor, and blended regions in photoactive layers
- Death Isn’t Sweet For Tumor Cells
- Selectively blocking glucose transport kills kidney cancer cells in mice while leaving normal cells intact
- Ion Channel Guides Blood-Seeking Bats
- Vampire bats decide where to sink their teeth into prey with the help of a heat-sensitive ion channel protein
- Model Cluster Yields Clues On Calcium's Water-Splitting Role
- CA2+ in the Mn-Ca cluster of photosystem II appears to set up Mn4+ to oxidize water
- Screening Drugs for Antimalarials
- High-throughput screening and gene profiling of existing drugs help identify new drug combinations to combat malaria
- Molecular Balances Measure Aliphatic CH-π Interactions
- A family of conformationally flexible molecules gives chemists a means for measuring weak interactions in solution
Topics Covered
Nano Lett.
Regions of conducting polymer (green), fullerene derivative (red), and homogeneous blends (yellow) are now distinguishable via TEM.
Combining analytical transmission electron microscopy with a data analysis technique provides a novel way to image nanoscale features in the photoactive layer of organic photovoltaic cells, according to Martin Pfannmöller of Germany’s Heidelberg University and coworkers, who developed the procedure (Nano Lett., DOI: 10.1021/nl201078t). The imaging technique makes it possible to relate the nanoscale appearance and morphology of the critical solar-cell component to the cell’s photovoltaic performance. Flexible polymer solar cells typically contain a photoactive region consisting of a mostly amorphous blend of a conducting polymer and a fullerene derivative. Those materials, which serve as electron donor and acceptor, respectively, exhibit little visual contrast difference and are tough to distinguish via microscopy. By combining an energy-filtering method, which analyzes the energies of electrons passing through a transmission electron microscope specimen, with a computational procedure, Pfannmöller and coworkers developed a way to impart sharp image contrast to the chemically distinct materials. The method reveals the location and shape of nanoscale domains of each of the pure materials, as well as the interconnecting mixed phases.
- Chemical & Engineering News
- ISSN 0009-2347
- Copyright © 2011 American Chemical Society
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