UV/Vis Spectroscopy / Ezine
Shedding light on an acid switch
Date: Nov 1, 2007
Author: David Bradley
UV-Vis absorption spectroscopy has been used to shed light on a novel supramolecular control mechanism in which a nanoscale molecular machine is driven by changes in pH. The molecular machine acts as a switch, flipping from one photoactive state to another in response to light by exploiting a proton transfer process in the same solution.
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Optical sensor for aliphatic amines uses the colorimetric and fluorescence responses of a smart textile
Date: Oct 8, 2007
Author:
A pH indicator has been developed based on the water-soluble dye benzo[de]anthracen-7-one applied to viscose fabric. It acts as a reversible colorimetric and fluorescent sensor for ammonia and aliphatic amines in buffered solution, changing from yellow to orange.
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Predictable wine
Date: Oct 1, 2007
Author: David Bradley
A simple tool for winemakers and researchers based on UV-vis spectroscopy allows them to predict levels of phenolic compounds, including anthocyanins, tannins, polymeric pigments, and iron-reactive phenols, in real-time and could lead to improved wine production methods.
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Spectroscopic studies of PVA films filled with a lanthanum/N-ethylmorpholine complex
Date: Sep 10, 2007
Author:
Poly(vinyl alcohol) films with different concentrations of lanthanum ions prepared by a casting technique have been characterised by optical absorption and transmission measurements.
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Sweet nanoreactor
Date: Sep 1, 2007
Author: David Bradley
A one-pot chemical reaction system based on nanoscopic capsules embedded in a polymer membrane has been devised by researchers in The Netherlands. The nanoreactor system allows cascade reactions to be carried out that would otherwise require multiple distinct reaction steps with time-consuming and wasteful separation and purification stages.
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Fluorescence analysis of DOM in natural, waste and polluted waters - a review
Date: Aug 13, 2007
Author:
This article reviews the use of fluorescence spectroscopic techniques to measure the intrinsic fluorescence of organic matter and the application of fluorescent DOM analysis in marine waters, freshwaters and wastewaters.
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Super stellar cocktail
Date: Aug 1, 2007
Author: David Bradley
A cocktail of chemicals is venting from the oxygen-rich region surrounding one of the most sensitive environmental atmospheres known. Radio astronomers have detected small molecules and compounds, including common salt, hydrogen isocyanide, phosphorus nitride, and protonated carbon monoxide, in the environment around a supergiant star.
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Analysis of non-anthocyanin phenols in wine by HPLC with UV and fluorescence detection
Date: Jul 9, 2007
Author:
A simple and rapid HPLC method with UV and fluorescence detection is reported for the separation of ten phenolic compounds including gallic acid, catechin, epicatechin, caffeic acid, coumaric, trans-piceid, cis-piceid, trans-resveratrol, cis-resveratrol and quercetin, in red wine.
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Superalloy-strong-resistant-ultravis-analysis
Date: Jul 1, 2007
Author: David Bradley
A variety of techniques, such as ultraviolet-visible spectroscopy and high-resolution transmission electron microscopy are being used by researchers at Sandia National Laboratory to investigate how superalloys form. Their work could lead to new approaches to the synthesis of novel materials with as yet unknown technological applications.
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An optical thermometer based on the delayed fluorescence of C70
Date: Jun 11, 2007
Author:
A sensitive and broad-ranged optical thermometer, based on the thermally activated delayed fluorescence of fullerene C70, consists of C70 molecularly dispersed in a polymer film and outperforms known standards.
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