Claire Horwell's research currently has the following foci:
1) Addressing a fundamental problem in the field of natural dust hazards: identifying what causes variations in natural dust toxicity. This includes investigation of the mechanism of formation of crystalline silica polymorphs in volcanic settings; assessment of surface occlusion of particles by more-inert minerals, and adaptation of analytical techniques for high-resolution micro-analysis of respirable crystalline silica in natural dusts (coal dust, volcanic ash, desert dusts, diatomaceous earth and surgarcane combustion).
2) Iron-induced reactivity of particle surfaces in different volcanic ash types. This is a hitherto unreported mechanism of toxicity for volcanic particles. Claire’s research, using EPR spectrometry, has shown that all volcanic ash generates hydroxyl radicals, but particularly basaltic ash, which was not previously thought of as a health hazard due to its lack of crystalline silica.
3) Grain-size analysis of volcanic ash for the rapid assessment of volcanic health hazard. Claire Horwell has built a database of volcanic ash grain-size analyses, focusing on health-pertinent fractions, to allow rapid assessment of health hazard at the onset of new eruptions. She also has developed a methodology for predicting quantities of respirable material in an ash sample where state-of-the-art analytical techniques are unavailable.
Passengers may think worldwide flight cancellations and reroutings were unnecessary after Iceland’s Eyjafjallajökull’s recent eruption, but clouds of volcanic ash and dust pose real and substantial dangers for aircraft jet engines.
Raw Story Mexico volcano ash disrupts US flights for second day Fox News MEXICO CITY (AFP) – Four US airlines canceled at least 10 flights to and from Mexico City's airport Friday after the Popocatepetl volcano spewed more ash, a day after hundreds...
For America to lead innovation in the 21st century, we have to make sure that our people are skilled and educated, operating in an economic environment that is conducive to their success and that allows them to compete at home and abroad.
Radioactive volcanic ash pendants can cause cancer: Subra Daily Express Putra Jaya: The Health Ministry has advised the public to refrain from buying and using pendants made of volcanic ash containing natural radioactive substances as it could...
It was impossible to see individual particles of ash with the naked eye, but the University of Reading has captured images which show the fascinating make-up of the outpourings from the Icelandic volcano...
The amount of ash released by Iceland's Eyjafjallajökull volcano during April 2010 was significantly underestimated at the time of the eruption, according to a new model developed at the University of Bristol and published in the Journal of...
At first glance these photos by Andre Ermolaev look like twisting abstract paintings, but in reality are aerial photos of rivers flowing through Iceland’s endless beds of volcanic ash. Given its name and stereotypical depiction it’s somewhat surprising to learn that the small country named after ice is home to no less than 30 active volcanic systems. You’ll remember the eruption of the massive Grímsvötn volcano just last year that spewed some 120 million tons of ash in the first 48 hours and snarled air traffic for days.
Mount Redoubt sounds off Anchorage Daily News Ash clouds are incredibly dangerous for airplane engines, and when the Alaska Volcano Observatory forecasts high-reaching volcanic ash the Federal Aviation Administration redirects flight paths.
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