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239 Results for "quartz"
Nanoscale Piezoelectric Quartz
—Nanoscale Piezoelectric Quartz “New synthetic techniques produce thin films of quartz on silicon” Quartz (SiO2) is the second most abundant mineral on Earth. Its ability to generate voltage in response to mechanical stress, known as the piezoelectric effect, also makes it one of the most useful minerals.
by Elizabeth K. Wilson | May 22, 2013
Quartz Hydration Fills Gap In Dating Artifacts
—Quartz Hydration Fills Gap In Dating Artifacts “” By measuring the thickness of the so-called hydration layer of quartz-containing artifacts and other materials, researchers can determine their age with a high degree of accuracy, according to a new study [J. Archaeol. Sci., 31, 883 (2004); http://www.sciencedirect.com/science/journal/03054403]. The new method—quartz hydration dating—can date artifacts from 100 to 100,000 years old, filling a chronological gap for artifacts and other materials that are between 50,000 and 100,000 years old, and for which current dating techniques are mostly ineffective. Materials containing quartz are common and have been used for millennia to make tools, housewares, and decorative objects.
by VICTORIA GILMAN | April 19, 2004
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Quartz Hydration Fills Gap In Dating Artifacts
C&EN: LATEST NEWS - Quartz Hydration Fills Gap In Dating Artifacts April 19, 2004 Volume 82, Number 16 p. 10 ARCHAEOLOGY Quartz Hydration Fills Gap In Dating Artifacts VICTORIA GILMAN By measuring the thickness of the so-called hydration layer of quartz-containing artifacts and other materials, researchers can determine their age with a high degree of accuracy, according to a new study [J.
by VICTORIA GILMAN | April 19, 2004
Crystal plant accident caused by stress corrosion cracking
Chemical Safety & Hazard Investigation Board last week released its report on a 2009 explosion at a quartz crystal manufacturing plant in Illinois operated by NDK America. CSB determined that a corrosive environment led to cracks in a pressure vessel's steel walls, resulting in its failure. The blast blew a piece of steel 650 feet to a nearby gas station, where it fatally injured one truck driver. When they were in operation, the six 50-foot tall crystallization vessels at the plant were loaded with raw mined quartz, 800 gallons of 4% sodium hydroxide in water, a "small amount" of lithium nitrate, and seed crystals of pure quartz, the CSB report says. Once sealed, they were heated to 370 °C and pressurized to 29,000 psig for 100 to 150 days.
by Jyllian Kemsley | November 21, 2013
Minerals in Medicine Exhibition
One example is this cinnabar with quartz from Kyrgyzstan. The bright red cinnabar, or mercury sulfide (HgS), has been used in producing glass thermometers and tooth fillings. /articles/94/i38/Minerals-Medicine-Exhibition.html 20160926 NIH, Smithsonian collaborate to highlight health applications of minerals News of The Week 94 38 /magazine/94/09438.html Minerals in Medicine Exhibition art & artifacts, minerals, medicine, NIH, smithsonian notw govpol Andrea Widener analytical-chemistry NIH Clinical Center Mineral with red and gold crystals. cinnabar with quartz NIH Smithsonian minerals Minerals in Medicine Exhibition Chemical & Engineering News Minerals in Medicine Exhibition Minerals in Medicine Exhibition
by Andrea Widener | September 26, 2016
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Bone cracks are linked to carbonate levels
Water concentration in quartz reveals crystal growth history Geochemist Phillip D. Ihinger and former undergraduate Stephen I. Zink of Yale University have used IR microspectroscopy to show that the concentration of hydrogen-containing impurities in quartz crystals is dependent on the crystal growth rate and can be used as a "speedometer" to read the growth-rate record [Nature, 404, 865 (2000)]. Measurements at various points across 800-m-thick slices cut from a quartz crystal revealed well-defined zones with different concentrations of water, reflecting variations in the growth rates of the different crystal faces. The authors determined that the concentration variations resulted from the growth rates because the water concentration was linearly correlated on all crystal faces with the concentration of aluminum impurities, which are incorporated in the quartz differently. The growth-rate speedometer still needs to be calibrated, which they will do by measuring hydroxyl uptake in quartz crystals grown under known conditions. The authors suggest that the technique will be useful to the electronics industry by furthering the understanding of the crystal chemistry associated with defect uptake in synthetic quartz crystals.
April 24, 2000
Merck Serono Funds Start-Ups In Switzerland
One of Quartz Bio’s key roles will be to assist drug companies in developing personalized medicines, he says. Quartz Bio launched in early November and has set up offices with Bluebox, a Geneva-based organization that assists start-ups. Merck Serono did not provide the start-up with funding but has agreed to an initial service contract.
by Alex Scott | December 10, 2012
South Korean firms to acquire Momentive
., the quartz and ceramics supplier Wonik QnC, and the private equity firm SJL Partners. According to the credit rating agency Moody’s, KCC and Wonik, will own 45% and 5% of Momentive, respectively. SJL will hold the balance. Momentive had before-tax earnings of $293 million on $2.3 billion in sales last year.
by Alexander H. Tullo | September 21, 2018