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Latest Nucleation Stories

2014-02-04 11:11:54

Rice University, Russian researchers lay out rules for ultrathin ‘diamane’ Perfect sheets of diamond a few atoms thick appear to be possible even without the big squeeze that makes natural gems. Scientists have speculated about it and a few labs have even seen signs of what they call diamane, an extremely thin film of diamond that has all of diamond’s superior semiconducting and thermal properties. Now researchers at Rice University and in Russia have calculated a “phase...

Theory Of The Formation Of Crystals Is Complete Again
2013-02-19 14:21:47

Eindhoven University of Technology Exactly how a crystal forms from solution is a problem that has occupied scientists for decades. Researchers at Eindhoven University of Technology (TU/e), together with researchers from Germany and the USA, are now presenting the missing piece. This classical theory of crystal formation, which occurs widely in nature and in the chemical industry, was under fire for some years, but is saved now. The team made this breakthrough by a detailed study of the...

2012-03-12 20:02:54

Peritectic solidification involves the nucleation and growth of the primary phase, the peritectic reaction of the primary phase with the remnant liquid phase, and the microstructural evolution of the product peritectic phase. It provides an effective approach for the synthesis or processing of various kinds of advanced materials. Professor WEI Bingbo and his group from the Department of Applied Physics, Northwestern Polytechnical University (NPU), in Xi'an, China, have demonstrated novel dual...

2010-07-28 13:13:34

Earth's climate is strongly influenced by the presence of particles of different shapes and origins -- in the form of dust, ice and pollutants -- that find their way into the lowest portion of the atmosphere, the troposphere. There, water adsorbed on the surface of these particles can freeze at higher temperatures than pure water droplets, triggering rain and snow. Researchers at Spain's Centre d'Investigaci³ en Nanocincia i Nanotecnologia (CIN2) have studied the underlying mechanisms of...

2010-06-16 23:22:39

Haze, scientifically known as atmospheric aerosols - microscopic particles suspended in the Earth's atmosphere - represents a major environmental problem because it degrades visibility, affects human health and influences the climate. Despite its profound impacts, how the haze is formed is not fully understood, says a Texas A&M University professor of atmospheric sciences and chemistry who has studied air chemistry for more than 20 years. Professor Renyi Zhang published his work in the...

2009-11-11 17:25:26

Engineers at the University of Leeds have developed a simple technology which can be used in existing chemical reactors to ensure "right first time" drug crystal formation. Ensuring drug crystals are formed correctly is crucial to their efficacy and the efficiency of pharmaceutical manufacturers' operations. Using self-assembled monolayers, the team has been able to show that crystals form into their desired product form with the correct shape and particle structure, without the usual...

2009-11-03 15:05:00

SAN JOSE, Calif., Nov. 3 /PRNewswire-FirstCall/ -- Novellus Systems (Nasdaq: NVLS) announced today that it has developed a new tungsten deposition process, called LRWxT, that can effectively reduce contact and line resistance at the 3Xnm technology node compared to conventional tungsten chemical vapor deposition (CVD-W) technology. The new approach uses the company's ALTUS® Max system for a unique deposition process sequence that results in highly conformal, large grain...

2009-08-10 16:21:00

U.S. scientists report the first real-time, direct observation of single nanocrystal growth in solution revealed much of what we thought we knew is wrong. The researchers, led by Berkeley National Laboratory Director Paul Alivisatos and Ulrich Dahmen, director of the lab's National Center for Electron Microscopy, said their study showed that while some crystals in solution grow steadily in size via classical nucleation and aggregation, others grow via coalescence events, in which small...

2009-04-16 19:20:00

SAN JOSE, Calif., April 16 /PRNewswire-FirstCall/ -- As semiconductor devices scale to the 32nm technology node and beyond, shrinking contact and via dimensions make chemical vapor deposition (CVD) of tungsten more challenging. Increasing aspect ratios can lead to voids or large seams within device features, resulting in lower yields and decreased performance in microprocessor and memory chips. The International Technology Roadmap for Semiconductors (ITRS) calls for 32nm stacked capacitor...

2008-10-02 03:00:20

By Phillion, A B Lee, P D; Maire, E; Cockcroft, S L Semisolid tensile testing combined with X-ray microtomography (XMT) was used to characterize the development of internal damage as a function of strain in an aluminum-magnesium alloy, AA5182. Novel techniques were developed to allow the quantification of both the size evolution and orientation of the damage to determine mechanisms controlling the early stage growth and localization. During the initial stages of semisolid deformation, it...


Word of the Day
cacodemon
  • An evil spirit; a devil.
  • A nightmare.
  • In astrology, the twelfth house of a scheme or figure of the heavens: so called from its signifying dreadful things, such as secret enemies, great losses, imprisonment, etc.
'Cacodemon' comes from a Greek term meaning 'evil genius.'
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