chalcogenides.com

Vahid G. Ta’eed1, Neil J. Baker1, Libin Fu1, Klaus Finsterbusch1, Michael R.E. Lamont1,

Abstract: Chalcogenide glasses offer large ultrafast third-order

Mellikov, E. (Tallinn Univ. of Technol., Estonia); Hiie, J.; Altosaar, M. Source: International Journal of Materials & Product Technology, v 28, n 3-4, 2007, p 291-311

Inorganic porous materials are being developed for use as molecular sieves, ion exchangers, and catalysts, but most are oxides. We show that various sulfide and selenide clusters, when bound to metal ions, yield gels having porous frameworks. These gels are transformed to aerogels after supercritical drying with carbon dioxide. The aerogels have high internal surface area (up to 327 square meters per gram) and broad pore size distribution, depending on the precursors used. The pores of these sulfide and selenide materials preferentially absorb heavy metals. These materials have narrow energy gaps (between 0.2 and 2.0 electron volts) and low densities, and they may be useful in optoelectronics, as photocatalysts, or in the removal of heavy metals from water.

^{Full article:
http://www.sciencemag.org/cgi/content/full/317/5837/490}

By Julie Steenhuysen

CHICAGO (Reuters) - A new porous material can soak up heavy metals from liquids like a sponge, U.S. researchers said on Thursday, offering a host of potential uses including removing pollutants such as mercury or lead from water.

The material is an aerogel, a type of rigid foam made from a gel in which most of the liquid has been replaced by gas.

"What we've made is a new kind of aerogel that is made of the same stuff that semiconductors are made of," said Mercouri Kanatzidis, a researcher with Northwestern University in Evanston, Illinois, and the U.S. Department of Energy's Argonne National Laboratory.

Classical aerogels -- which are made of silica or carbon -- have been around for many decades. "They are white and colorless and don't absorb any light," Kanatzidis said in a telephone interview.

Kanatzidis has made aerogels from chalcogenides, which are used in semiconductors.

"These new aerogels absorb light and they can be changed in composition from one kind to another," said Kanatzidis, whose work appears in the journal Science.

Read the article here:
http://www.reuters.com/article/scienceNews/idUSN2618995520070726

Hyo, Joong Lee (Department of Chemistry, Center for Integrated Molecular Systems, Pohang University of Science and Technology); Kim, Dae-Young; Yoo, Jung-Suk; Bang, Jiwon; Kim, Sungjee; Park, Su-Moon Source: Bulletin of the Korean Chemical Society, v 28, n 6, Jun 20, 2007, p 953-958

Finsterbusch, Klaus (Centre for Ultrahigh-Bandwidth Devices for Optical Systems (CUDOS), School of Physics, University of Sydney); Baker, Neil J.; Ta'eed, Vahid G.; Eggleton, Benjamin J.; Choi, Duk-Yong; Madden, Steve; Luther-Davies, Barry Source: Journal of the Optical Society of America B: Optical Physics, v 24, n 6, June, 2007, p 1283-1290

Gautam, S. (Centre of Adv. Study in Phys., Panjab Univ., Chandigarh, India); Thakur, A.; Tripathi, S.K.; Goyal, N. Source: Journal of Non-Crystalline Solids, v 353, n 13-15, 15 May 2007, p 1315-21

Seddon, A.B. (Novel Photonic Glasses Group, Nottingham Univ., UK); Pan, W.J.; Furniss, D.; Rowe, H.; Miller, C.A.; Loni, A.; Sewell, P.; Benson, T.M. Source: Journal of Non-Crystalline Solids, v 353, n 13-15, 15 May 2007, p 1302-6

Wagner, T. (Dept. of Gen. & Inorg. Chem., Univ. of Pardubice, Czech Republic); Gutwirth, J.; Bezdicka, P.; Vlcek, Mil.; Kasap, S.O.; Frumar, M. Source: Journal of Non-Crystalline Solids, v 353, n 13-15, 15 May 2007, p 1431-6

Teteris, J. (Inst. of Solid State Phys., Univ. of Latvia, Riga, Latvia); Reinfelde, M. Source: Journal of Non-Crystalline Solids, v 353, n 13-15, 15 May 2007, p 1450-3

house insurance unsecured loans life insurance buytolet mortgage