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October 5, 2009 - Volume 87, Number 40
- p. 37
Science & Technology Concentrates
More Science & Technology Concentrates
- Microgel Enzyme Inhibitor
- A molecularly imprinted polymer selectively inhibits trypsin better that one of the enzyme’s known small-molecule inhibitors
- Element 114 Confirmed
- Eight-day-long atom-smashing experiment reproduces 10-year-old result
- Improved Selectivity In Making Metallic Carbon Nanotubes
- A new method to prepare single-walled carbon nanotubes allows better control over the tubes’ chirality and thus their conductivity properties
- Evaporating Polymer Produces Webby Patterns
- Controlling the evaporation of a drop of diblock copolymer under just the right conditions leads to self-assembly of weblike thin films
- Engineered Response To A Faux Dopamine
- Mutating one amino acid in a dopamine receptor makes a new tool for dissecting brain signals
- Serotonin Harnesses Small RNAs To Strengthen Synapses
- A study reveals that the neurotransmitter can regulate microRNAs and thus protein synthesis, which could shed light on long-term memory
- Structure Prediction Cautionary Tale
- Uneven analysis of crystal polymorphs suggests that extra caution is required with computational prediction of crystal structures
- Colorful Organic Nanocolloids
- Confining discreet numbers of dye molecules in liquid crystals yields a colorful array of organic-based materials
Topics Covered
ACS Nano
Coloroids The color of nanosized organic colloids can be tuned by controlling the number of dye molecules confined in the liquid-crystalline materials.
Nanosized organic colloidal particles can fluoresce in a wide range of wavelengths in a manner reminiscent of inorganic quantum dots by controlling the aggregation of dye molecules inside the colloids, according to scientists at the Naval Research Laboratory, in Washington, D.C. (ACS Nano, DOI: 10.1021/nn9007498). These novel fluorescent nanoparticles and the wealth of functionalized derivatives that potentially can be made from them may find use in a host of fluorescence imaging and biological-labeling applications. Christopher M. Spillmann, Jawad Naciri, Banahalli R. Ratna, and coworkers formed the colloidal particles by reacting a polymerizable organic compound that exhibits a liquid-crystalline phase with a diimide perylene chromophore. By adjusting the ratio of the organic components, the research team controlled the number of dye molecules confined in the liquid crystals. In that way, the researchers caused the dye molecules to assemble into dimers, trimers, and larger aggregations, which led to increasingly larger red shifts in the colloids’ emission spectra. The colloidal particles, which have a long shelf life, can be prepared from other perylene derivatives, thereby extending the range of colors available from organic colloids, the researchers say.
- Chemical & Engineering News
- ISSN 0009-2347
- Copyright © 2009 American Chemical Society
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