[Due to the increasing size of the archives, each topic page now contains only the prior 365 days of content. Access to older stories is now solely through the Monthly Archive pages or the site search function.]
USC team finds Li-Al nanoparticles produce hydrogen from water with high rate and yield; potential for industrial scaling
June 27, 2014
Aluminum and water react exothermically to form aluminum hydroxide and hydrogen; this basic property has lured numerous researchers interested in generating hydrogen from the aluminum-water reaction for modern transportation systems for at least 35 years. (Earlier post.) However, among the barriers to the practical application of this reaction are the low reaction rate and poor yield.
Now, results of large quantum molecular dynamics (QMD) simulations by a team at the University of Southern California suggest that alloying aluminum particles with lithium to produce hydrogen from water can produce orders-of-magnitude faster reactions with higher yields. Their paper is published in the ACS journal Nano Letters.
Researchers review risk to water resources from unconventional shale gas development in US
June 19, 2014
A team from Duke University, Stanford University, Dartmouth College and Ohio State University has published in the ACS journal Environmental Science & Technology an overview and synopsis of recent investigations (as of January 2014) into one set of possible environmental impacts from unconventional shale gas development: the potential risks to water resources.
They identified four potential modes of water resource degradation: (1) shallow aquifers contaminated by fugitive natural gas (i.e., stray gas contamination) from leaking shale gas and conventional oil and gas wells, potentially followed by water contamination from hydraulic fracturing fluids and/or formation waters from the deep formations; (2) surface water contamination from spills, leaks, and the disposal of inadequately treated wastewater or hydraulic fracturing fluids; (3) accumulation of toxic and radioactive elements in soil and the sediments of rivers and lakes exposed to wastewater or fluids used in hydraulic fracturing; and (4) the overuse of water resources, which can compete with other water uses such as agriculture in water-limited environments.
DOE releases report on water-energy nexus
The US Department of Energy (DOE) released a new report that frames an integrated challenge and opportunity space around the water-energy nexus for DOE and its partners and lays the foundation for future efforts.
Present day water and energy systems are tightly intertwined. Water is used in all phases of energy production and electricity generation. Energy is required to extract, convey, and deliver water of appropriate quality for diverse human uses. Recent developments have focused national attention on these connections.
Ford expands use of near-dry machining to six plants worldwide
October 17, 2013
|Left: Wet flood machining. Right: MQL machining. Graphics: Unist Inc. Click to enlarge.|
Ford Motor Company has added its near-dry machining process—Minimum Quantity Lubrication (MQL)—to six plants globally, a number that will nearly double in the next few years.
Machining metal pieces generates friction and heat. Conventional wet machining floods the work piece with metal-working fluids, requiring large amounts of fluid to cool and lubricate the cutting tools. MQL eliminates conventional flood coolant from the machining processes, lubricating cutting tools with a fine spray of oil directed exactly when and where it is needed. MQL reduces oil mist generation; biological contamination of coolant; waste water volume; costs for capital equipment; and regulatory permitting. MQL also improves recycling and transport of coolant contaminated chips.