Navigation Links
New property found in ancient mineral lodestone
Date:12/17/2007

HOUSTON -- Dec. 17, 2007 -- Using the latest methods for nanofabrication, a team led by Rice University physicists has discovered a surprising new electronic property in one of the earliest-known and most-studied magnetic minerals on Earth -- lodestone, also known as magnetite.

By changing the voltage in their experiment, researchers were able to get magnetite at temperatures colder than minus 250 degrees Fahrenheit to revert from an insulator to a conductor. The research was published online Dec. 16 and will be included in February's print edition of Nature Materials.

"It's fascinating that we can still find surprises in a material like magnetite that has been studied for thousands of years," said lead researcher Doug Natelson, associate professor of physics and astronomy. "This kind of finding is really a testament to what's possible now that we can fabricate electronic devices to study materials at the nanoscale."

The magnetic properties of lodestone, also known as magnetite, were documented in China more than 2,000 years ago, and Chinese sailors were navigating with lodestone compasses as early as 900 years ago.

Magnetite is a particular mineral of iron oxide. Its atoms are arranged in a crystal structure with four oxygen atoms for every three of iron, and their arrangement gives the mineral its characteristic magnetic and electrical properties. Physicists have known for more than 60 years that the electronic properties of magnetite change radically and quickly at cold temperatures. As the material cools below a critical temperature near minus 250 degrees Fahrenheit, it changes from an electrical conductor to an electrical insulator -- a electrical transformation that's akin to the physical change water undergoes when it freezes into ice.

"When we applied a sufficiently large voltage across our nanostructures we found that we could kick the cooled magnetite out of its insulating phase and cause it to become a con
'/>"/>

Contact: B.J. Almond
balmond@rice.edu
713-348-6770
Rice University
Source:Eurekalert

Page: 1 2

Related biology technology :

1. Angiotech receives favourable patent decision from New Zealands Intellectual Property Office
2. Amyris Biotechnologies Co-Founder Neil Renninger Named to Technology Reviews Prestigious TR35 List of Top Young Innovators
3. PDL BioPharma Announces Internal CEO Investigation Found No Credible Evidence of Improper Personal Conduct or Breach of Fiduciary Duty
4. GeneGo and the Cystic Fibrosis Foundation Collaborate to Advance Understanding of Cystic Fibrosis
5. More Than 230 Cyclists to Ride in Amgen California Coast Classic Bike Tour to Raise $1.3 Million for Arthritis Foundation
6. Founder of ILEX Oncology and Triton Biosciences, Richard Love, Joins Board of Directors of Cell Therapeutics, Inc. (CTI)
7. Medivation Selected as Founding Member of New NASDAQ(R) NeuroInsights(R) Neurotech Index
8. International Atomic Energy Agency and National Foundation for Cancer Research Launch Major Initiative to Improve Cancer Prevention and Treatments in Developing Countries
9. Ikaria Founding Scientist Named 2007 MacArthur Fellow
10. Melanoma Research Foundation and Seattle Cancer Care Alliance Host Educational Symposium and Reception for Melanoma Patients, Family Members and Healthcare Providers
11. Foundation for Biomedical Research Board Chairman Awarded Congressional Gold Medal
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:5/4/2015)... 4, 2015  RegeneRx Biopharmaceuticals, Inc. (OTCQB: RGRX) ... independent team of researchers from South ... (TB4) plays an important role in accelerating the ... an experimental mouse model, by promoting blood vessel ... dermal tissue.  The research found that the underlying ...
(Date:5/4/2015)... Achieved primarily through a proprietary paraffin and stain additive, ... better detail than the industry standard. But because ... methods, it needed another medium to measure its detail. ... reference because it represents the highest standard of detail ... discovery days of Ultralight Histology was to reverse engineer ...
(Date:5/4/2015)... HONG KONG , May 4, 2015 ... or the "Company"), China,s leading ... cell processing and stem cell storage services, today announced ... Holdings Limited ("Golden Meditech"), a Hong Kong ... the Company, has entered into an agreement (the "Agreement") ...
(Date:5/4/2015)... , May 4, 2015   Tocagen Inc. ... interim data from Tocagen,s ongoing investigational studies were ... of the American Association of Neurological Surgeons (AANS)/Congress ... May 1-2, 2015, in Washington, D.C. ... held a meeting with FDA and continues to ...
Breaking Biology Technology:Researchers Report that Thymosin B4 has a Major Role in Dermal Burn Wound Healing 2Researchers Report that Thymosin B4 has a Major Role in Dermal Burn Wound Healing 3China Cord Blood Corporation Receives Notice of a Transaction Regarding its 7% Senior Convertible Notes Due 2017 Held by KKR 2China Cord Blood Corporation Receives Notice of a Transaction Regarding its 7% Senior Convertible Notes Due 2017 Held by KKR 3Tocagen Presents Updated Interim Survival Data from Ongoing Clinical Studies at American Association of Neurological Surgeons (AANS)/Congress of Neurological Surgeons (CNS) Section on Tumors 2Tocagen Presents Updated Interim Survival Data from Ongoing Clinical Studies at American Association of Neurological Surgeons (AANS)/Congress of Neurological Surgeons (CNS) Section on Tumors 3Tocagen Presents Updated Interim Survival Data from Ongoing Clinical Studies at American Association of Neurological Surgeons (AANS)/Congress of Neurological Surgeons (CNS) Section on Tumors 4Tocagen Presents Updated Interim Survival Data from Ongoing Clinical Studies at American Association of Neurological Surgeons (AANS)/Congress of Neurological Surgeons (CNS) Section on Tumors 5
... Texas, June 22, 2011 Five exceptional oncology ... McKesson Specialty Care Solutions | US Oncology ... their patients. The Excellence in Oncology Nursing Award honors those ... who exemplify competency, courage and determination in providing the highest ...
... June 22, 2011 The Roche manuscript: "Immunoglobulin Domain ... Bispecific IgG Antibodies" has been published in the prestigious ... USA (PNAS). Corresponding authors are Wolfgang Schaefer, ... and Christian Klein, Head of Oncology Programs, Discovery Oncology ...
... June 22, 2011 VENENUM Biodesign, a drug discovery ... compound collection to identify potential therapeutic agents against its ... that it opened its new medicinal chemistry space at ... The facility comprises over 11,000 square feet of ...
Cached Biology Technology:McKesson Specialty Care Solutions | US Oncology Honors Five Exceptional Oncology Nurses for Outstanding Work 2McKesson Specialty Care Solutions | US Oncology Honors Five Exceptional Oncology Nurses for Outstanding Work 3McKesson Specialty Care Solutions | US Oncology Honors Five Exceptional Oncology Nurses for Outstanding Work 4Proceedings of the National Academy of Sciences (PNAS) Publishes Roche Manuscript on Production of Bispecific IgG Antibodies 2VENENUM Biodesign Announces Opening of Medicinal Chemistry Labs 2
(Date:4/2/2015)... , April 2, 2015 ... Q1 2015 attributed to somewhat higher than 125 MSEK. ... the year-end report 2014 that revenues for Q1 2015 ... the company reported for Q4 2014. The operating result ... be negative. The complete interim report will as previously ...
(Date:3/31/2015)...  Elephant Talk Communications Corp. (NYSE MKT: ETAK) ("Elephant ... Defined Network Architecture (ET Software DNA® 2.0) platforms and ... $20.4 million for the year ended December 31, 2014 ... year ended December 31, 2013. At ... its multi-year transition away from its legacy landline business ...
(Date:3/24/2015)... , Mar. 24, 2015 Research and Markets ... the "Global Iris Recognition Market 2015-2019" report ... Global Iris Recognition market to grow at a CAGR ... This report covers the present scenario and the growth ... period 2015-2019. To calculate the market size, the report ...
Breaking Biology News(10 mins):Fingerprint Cards Revises Revenues for Q1 2015 2Elephant Talk Reports 2014 Fourth Quarter and Year End Financial Results 2Elephant Talk Reports 2014 Fourth Quarter and Year End Financial Results 3Elephant Talk Reports 2014 Fourth Quarter and Year End Financial Results 4Elephant Talk Reports 2014 Fourth Quarter and Year End Financial Results 5Elephant Talk Reports 2014 Fourth Quarter and Year End Financial Results 6Global Iris Recognition Market 2015-2019 with 3M Cogent, Bioenable Technologies, Cross Match Technology, Iris ID Systems & Safran Dominating 2
... disabilities who are struggling to regain the use of ... engineers and students from Rochester Institute of Technology. ... the human body, to improve the performance of external ... disabilities, such as strokes or major spinal cord injuries, ...
... know all there is to know about Escherichia coli, ... has more than four thousand genes, and the functions ... Siegele, a biology professor at Texas A&M University whose ... , Harmless E. coli strains are normally found in ...
... Understanding, through its Institute for Arctic Studies, has ... Science Foundation through its Integrative Graduate Education and ... grant supports the development of an interdisciplinary doctoral ... a focus on rapid environmental change. "This grant ...
Cached Biology News:Robotics research: Enhancing the lives of people with disabilities 2GIANT-Coli: A novel method to quicken discovery of gene function 2Dartmouth awarded NSF grant for new polar sciences, engineering grad program 2Dartmouth awarded NSF grant for new polar sciences, engineering grad program 3
SHEEP ANTI FLECAINIDE...
RAT ANTI MOUSE F4/80 ANTIGEN:BIOTIN Immunogen: Thioglycollate stimulated peritoneal macrophages from C57/BL mice...
Sterile glass 5 mm beads that make spreading bacterial and yeast cultures easy. Can be washed, autoclaved and reused....
REGULATED IN DEVELOPMENT AND DNA DAMAGE RESPONSES 1,HIF-1 responsive RTP801...
Biology Products: