PRESS-NEWS.org - Press Release Distribution
PRESS RELEASES DISTRIBUTION

Under pressure, sodium, hydrogen could undergo a metamorphosis, emerging as superconductor

2011-06-14
(Press-News.org) BUFFALO, N.Y. -- In the search for superconductors, finding ways to compress hydrogen into a metal has been a point of focus ever since scientists predicted many years ago that electricity would flow, uninhibited, through such a material. Liquid metallic hydrogen is thought to exist in the high-gravity interiors of Jupiter and Saturn. But so far, on Earth, researchers have been unable to use static compression techniques to squeeze hydrogen under high enough pressures to convert it into a metal. Shock-wave methods have been successful, but as experiments with diamond anvil cells have shown, hydrogen remains an insulator even under pressures equivalent to those found in the Earth's core. To circumvent the problem, a pair of University at Buffalo chemists has proposed an alternative solution for metallizing hydrogen: Add sodium to hydrogen, they say, and it just might be possible to convert the compound into a superconducting metal under significantly lower pressures. The research, published June 10 in Physical Review Letters, details the findings of UB Assistant Professor Eva Zurek and UB postdoctoral associate Pio Baettig. Using an open-source computer program that UB PhD student David Lonie designed, Zurek and Baettig looked for sodium polyhydrides that, under pressure, would be viable superconductor candidates. The program, XtalOpt , is an evolutionary algorithm that incorporates quantum mechanical calculations to determine the most stable geometries or crystal structures of solids. In analyzing the results, Baettig and Zurek found that NaH9, which contains one sodium atom for every nine hydrogen atoms, is predicted to become metallic at an experimentally achievable pressure of about 250 gigapascals -- about 2.5 million times the Earth's standard atmospheric pressure, but less than the pressure at the Earth's core (about 3.5 million atmospheres). "It is very basic research," says Zurek, a theoretical chemist. "But if one could potentially metallize hydrogen using the addition of sodium, it could ultimately help us better understand superconductors and lead to new approaches to designing a room-temperature superconductor." By permitting electricity to travel freely, without resistance, such a superconductor could dramatically improve the efficiency of power transmission technologies. Zurek, who joined UB in 2009, conducted research at Cornell University as a postdoctoral associate under Roald Hoffmann, a Nobel Prize-winning theoretical chemist whose research interests include the behavior of matter under high pressure. In October 2009, Zurek co-authored a paper with Hoffman and other colleagues in the Proceedings of the National Academy of Sciences predicting that LiH6 -- a compound containing one lithium atom for every six hydrogen atoms -- could form as a stable metal at a pressure of around 1 million atmospheres. Neither LiH6 and NaH9 exists naturally as stable compounds on Earth, but under high pressures, their structure is predicted to be stable. "One of the things that I always like to emphasize is that chemistry is very different under high pressures," Zurek says. "Our chemical intuition is based upon our experience at one atmosphere. Under pressure, elements that do not usually combine on the Earth's surface may mix, or mix in different proportions. The insulator iodine becomes a metal, and sodium becomes insulating. Our aim is to use the results of computational experiments in order to help develop a chemical intuition under pressure, and to predict new materials with unusual properties." ###The University at Buffalo is a premier research-intensive public university, a flagship institution in the State University of New York system and its largest and most comprehensive campus. UB's more than 28,000 students pursue their academic interests through more than 300 undergraduate, graduate and professional degree programs. Founded in 1846, the University at Buffalo is a member of the Association of American Universities.


ELSE PRESS RELEASES FROM THIS DATE:

Scientists find deadly amphibian disease in the last disease-free region of central America

Scientists find deadly amphibian disease in the last disease-free region of central America
2011-06-14
Smithsonian scientists have confirmed that chytridiomycosis, a rapidly spreading amphibian disease, has reached a site near Panama's Darien region. This was the last area in the entire mountainous neotropics to be free of the disease. This is troubling news for the Panama Amphibian Rescue and Conservation Project, a consortium of nine U.S. and Panamanian institutions that aims to rescue 20 species of frogs in imminent danger of extinction. Chytridiomycosis has been linked to dramatic population declines or even extinctions of amphibian species worldwide. Within five ...

New study supports Darwin's hypothesis on competition between species

New study supports Darwins hypothesis on competition between species
2011-06-14
A new study provides support for Darwin's hypothesis that the struggle for existence is stronger between more closely related species than those distantly related. While ecologists generally accept the premise, this new study contains the strongest direct experimental evidence yet to support its validity. "We found that species extinction occurred more frequently and more rapidly between species of microorganisms that were more closely related, providing strong support for Darwin's theory, which we call the phylogenetic limiting similarity hypothesis," said Lin Jiang, ...

Sleep can boost classroom performance of college students

2011-06-14
DARIEN, IL – Sleep can help college students retain and integrate new information to solve problems on a classroom exam, suggests a research abstract that will be presented Tuesday, June 14, in Minneapolis, Minn., at SLEEP 2011, the 25th Anniversary Meeting of the Associated Professional Sleep Societies LLC (APSS). Results show that performance by university undergraduates on a microeconomics test was preserved after a 12-hour period that included sleep, especially for cognitively-taxing integration problems. In contrast, performance declined after 12 hours of wakefulness ...

College students sleep longer but drink more and get lower grades when classes start later

2011-06-14
DARIEN, IL – Although a class schedule with later start times allows colleges students to get more sleep, it also gives them more time to stay out drinking at night. As a result, their grades are more likely to suffer, suggests a research abstract that will be presented Tuesday, June 14, in Minneapolis, Minn., at SLEEP 2011, the 25th Anniversary Meeting of the Associated Professional Sleep Societies LLC (APSS). Results show that later class start times were associated with a delayed sleep schedule, which led to poorer sleep, more daytime sleepiness, and a lower grade-point ...

Sleep problems may be a link between perceived racism and poor health

2011-06-14
DARIEN, IL – Perceived racial discrimination is associated with an increased risk of sleep disturbance, which may have a negative impact on mental and physical health, suggests a research abstract that will be presented Tuesday, June 14, in Minneapolis, Minn., at SLEEP 2011, the 25th Anniversary Meeting of the Associated Professional Sleep Societies LLC (APSS). Results show that perceived racism was associated with an elevated risk of self-reported sleep disturbance, which was increased by 61 percent after adjusting for socioeconomic factors and symptoms of depression. ...

Cognitive-behavioral therapy for insomnia can reduce suicidal ideation

2011-06-14
DARIEN, IL – Treating sleep problems with cognitive-behavioral therapy for insomnia can reduce suicidal ideation, suggests a research abstract that will be presented Tuesday, June 14, in Minneapolis, Minn., at SLEEP 2011, the 25th Anniversary Meeting of the Associated Professional Sleep Societies LLC (APSS). Results show that about 21 percent of participants with insomnia (65 of 303) reported having suicidal thoughts or wishes during the past two weeks. Group cognitive-behavioral therapy for insomnia produced a statistically significant post-treatment reduction in suicidal ...

White adolescent girls may be losing sleep from the pressure to be thin

2011-06-14
DARIEN, IL – Sleep duration has a significant association with feelings of external pressure to obtain or maintain a thin body among adolescent girls, especially those who are white, suggests a research abstract that will be presented Tuesday, June 14, in Minneapolis, Minn., at SLEEP 2011, the 25th Anniversary Meeting of the Associated Professional Sleep Societies LLC (APSS). Results show that pressures to have a thin body from girlfriends and from the media significantly predict sleep duration and account for 4.5 percent of the variance in hours of sleep for adolescent ...

Sleep loss in early childhood may contribute to the development of ADHD symptoms

2011-06-14
DARIEN, IL – Short sleep duration may contribute to the development or worsening of hyperactivity and inattention during early childhood, suggests a research abstract that will be presented Tuesday, June 14, in Minneapolis, Minn., at SLEEP 2011, the 25th Anniversary Meeting of the Associated Professional Sleep Societies LLC (APSS). Results show that less sleep in preschool-age children significantly predicted worse parent-reported hyperactivity and inattention at kindergarten. In contrast, hyperactivity and inattention at preschool did not predict sleep duration at kindergarten. ...

The good life: Good sleepers have better quality of life and less depression

2011-06-14
DARIEN, IL – Getting six to nine hours of sleep per night is associated with higher ratings for quality of life and lower ratings for depression, suggests a research abstract that will be presented Tuesday, June 14, in Minneapolis, Minn., at SLEEP 2011, the 25th Anniversary Meeting of the Associated Professional Sleep Societies LLC (APSS). Results show that people with a "normal" sleep duration of six to nine hours per night had higher self-reported scores for quality of life and lower scores for depression severity compared to short and long sleepers. These differences ...

Bolivia Volunteers distribute winter clothing.

2011-06-13
As an exceptionally cold weather spell grips Cochabamba, with night-time temperatures falling to below zero, BOLIVIA VOLUNTEERS is appealing to the local community for gifts of warm clothing and blankets. Administrator Willson Marshal says, ´It certainly seems that our Winter has arrived early this year - and is developing into the coldest we have seen for many years. Our volunteers have been hard at work for the past week collecting donations of clothes, and distributing them to the city´s street children - living rough in door-ways, in local parks, and under the ...

LAST 30 PRESS RELEASES:

Study tracks chromium chemistry in irradiated molten salts

Scientists: the beautiful game is a silver bullet for global health

Being physically active, even just a couple of days a week, may be key to better health

High-fat diet promote breast cancer metastasis in animal models

A router for photons

Nurses and AI collaborate to save lives, reduce hospital stays

Multi-resistance in bacteria predicted by AI model

Tinker Tots: A citizen science project to explore ethical dilemmas in embryo selection

Sensing sickness

Cost to build multifamily housing in California more than twice as high as in Texas

Program takes aim at drinking, unsafe sex, and sexual assault on college campuses

Inability to pay for healthcare reaches record high in U.S.

Science ‘storytelling’ urgently needed amid climate and biodiversity crisis

KAIST Develops Retinal Therapy to Restore Lost Vision​

Adipocyte-hepatocyte signaling mechanism uncovered in endoplasmic reticulum stress response

Mammals were adapting from life in the trees to living on the ground before dinosaur-killing asteroid

Low LDL cholesterol levels linked to reduced risk of dementia

Thickening of the eye’s retina associated with greater risk and severity of postoperative delirium in older patients

Almost one in ten people surveyed report having been harmed by the NHS in the last three years

Enhancing light control with complex frequency excitations

New research finds novel drug target for acute myeloid leukemia, bringing hope for cancer patients

New insight into factors associated with a common disease among dogs and humans

Illuminating single atoms for sustainable propylene production

New study finds Rocky Mountain snow contamination

Study examines lactation in critically ill patients

UVA Engineering Dean Jennifer West earns AIMBE’s 2025 Pierre Galletti Award

Doubling down on metasurfaces

New Cedars-Sinai study shows how specialized diet can improve gut disorders

Making moves and hitting the breaks: Owl journeys surprise researchers in western Montana

PKU Scientists simulate the origin and evolution of the North Atlantic Oscillation

[Press-News.org] Under pressure, sodium, hydrogen could undergo a metamorphosis, emerging as superconductor