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'Greener' aerogel technology holds potential for oil and chemical clean-up
Date:2/25/2014

MADISON, Wis. Cleaning up oil spills and metal contaminates in a low-impact, sustainable and inexpensive manner remains a challenge for companies and governments globally.

But a group of researchers at the University of WisconsinMadison is examining alternative materials that can be modified to absorb oil and chemicals without absorbing water. If further developed, the technology may offer a cheaper and "greener" method to absorb oil and heavy metals from water and other surfaces.

Shaoqin "Sarah" Gong, a researcher at the Wisconsin Institute for Discovery (WID) and associate professor of biomedical engineering, graduate student Qifeng Zheng, and Zhiyong Cai, a project leader at the USDA Forest Products Laboratory in Madison, have recently created and patented the new aerogel technology.

Aerogels, which are highly porous materials and the lightest solids in existence, are already used in a variety of applications, ranging from insulation and aerospace materials to thickening agents in paints. The aerogel prepared in Gong's lab is made of cellulose nanofibrils (sustainable wood-based materials) and an environmentally friendly polymer. Furthermore, these cellulose-based aerogels are made using an environmentally friendly freeze-drying process without the use of organic solvents.

It's the combination of this "greener" material and its high performance that got Gong's attention.

"For this material, one unique property is that it has superior absorbing ability for organic solvents up to nearly 100 times its own weight," she says. "It also has strong absorbing ability for metal ions."

Treating the cellulose-based aerogel with specific types of silane after it is made through the freeze-drying process is a key step that gives the aerogel its water-repelling and oil-absorbing properties.

"So if you had an oil spill, for example, the idea is you could throw this aerogel sheet in the water and it would st
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Contact: Shaoqin Gong
sgong@engr.wisc.edu
608-316-4311
University of Wisconsin-Madison
Source:Eurekalert  

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