Navigation Links
Spiraling nanotrees offer new twist on growth of nanowires
Date:5/1/2008

>

His team created its nanotrees specifically by applying a slight variation of a synthesis technique called chemical vapor deposition to the material lead sulfide. But the chemists believe the new mechanism will be applicable to many other materials, as well.

We think these findings will motivate a lot of people to do this purposefully, to design dislocation and try to grow nanowires around it, Jin says. Or perhaps people who have grown a structure and were puzzled by it will read our paper and say, Hey, we see something similar in our system, so maybe now we have the solution.

What initially puzzled Jin and his students about their pine tree structures was the long length of the trunks compared with the branches, a difference that indicated the trunks were growing much faster. The result was surprising because when complex, branching nanostructures are grown with metal catalysts, the branches are usually all of similar length because of similar growth rates, leading to boxy shapes rather than the cone-shapes of the trees.

Another oddity was the twist to the trunks, which sent the branches spiraling.

The long and twisting trunks were telling us we had a new growth mode, says Jin. Suspecting dislocation, the team set about refining their technique for growing the pine trees they soon learned to produce entire forests with ease and then confirmed the presence of dislocations with a special type of transmission electron microscopy.

Upon closer examination, the twisting trunks and spiraling branches also turned out to embody a well-known general theory about the mechanical deformation of crystalline materials caused by screw dislocations. Although this so-called Eshelby twist was first calculated back in 1953 and is discussed in many textbooks, Jins experimental results likely offer the best support yet for the theory.

These are beautiful, truly intriguing structures, but behind them is also a really beautiful, i
'/>"/>

Contact: Song Jin
jin@chem.wisc.edu
608-262-1562
University of Wisconsin-Madison
Source:Eurekalert

Page: 1 2 3

Related biology technology :

1. Emisphere Technologies, Inc. Announces Pricing of Registered Direct Offering
2. Roche Extends Tender Offer for Ventana
3. ATS Medical Expands Open Pivot Heart Valve Offerings
4. New 200 mg Vial for Eloxatin(R) (Oxaliplatin Injection) Offers Greater Convenience and Efficiency of Preparation
5. Updated NIH Guidelines Offer Valuable Information on Asthma Diagnosis and Management
6. ARYx Therapeutics, Inc. Files Registration Statement for Initial Public Offering
7. Anacor Files Registration Statement for Initial Public Offering
8. NPS Pharmaceuticals Commences Tender Offer for 3.0% Convertible Notes Due 2008
9. Clinsys Clinical Research, Inc. Announces Key Hires, Rajagopalan Srinivasan, Ph.D, to Strengthen Global Biostatistics Service Offering and Christopher Gregory, Ph.D, to Scientific Affairs
10. Schering-Plough Announces Pricing of Senior Notes Offering
11. Exelixis Announces Closing of Public Offering of Common Stock
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:9/14/2014)... MD (PRWEB) September 15, 2014 ... be held on Tuesday, October 21, 2014, from 12:00 ... overview of the program’s innovative curriculum and practice-oriented instruction, ... a graduate degree can help advance their career in ... RSVP online . , About UMBC’s Biotechnology ...
(Date:9/14/2014)... regulate protein functions in a wide variety of ways, ... a protein can take on another form and perform ... that fold wrongly can cause serious diseases such as ... also have a tendency to "infect" other molecules of ... fibrils or plaques. These amyloids can damage cells and ...
(Date:9/14/2014)... ingenious when it comes to survival strategies. They often ... environment, for example during treatment with antibiotics. A biofilm ... protective slime capsule consisting of sugar chains and "curli". ... for the first time created a detailed three-dimensional image ... cross the bacterial cell wall, a crucial step in ...
(Date:9/13/2014)... Phoenixville, PA (PRWEB) September 13, 2014 ... medical device innovations, is proud to announce the successful ... Health Network bariatric surgeons Leonardo Claros, MD, FACS, FAMBS, ... ViSiGi 3D™ Sleeve Gastrectomy Calibration System. , This ... a postgraduate course of more than four hundred surgeons ...
Breaking Biology Technology:UMBC Biotechnology Graduate Programs’ Virtual Info Session, October 21, 2014 2Measuring modified protein structures 2Measuring modified protein structures 3New insights in survival strategies of bacteria 2Boehringer Laboratories, Inc. Announces Live Surgery Using Innovative System to Calibrate Sleeve Gastrectomy 2
... Press Ganey Associates, Inc. has announced its elite class ... the first-ever Summit and Top Improver awards for clinical ... Medical Centers. Press Ganey, the health ... more than 10,000 health care organizations worldwide to create ...
... Calif., Nov. 15, 2011 Quest Diagnostics Incorporated (NYSE: ... diagnostic testing, information and services, today announced that its ... Cytomegalovirus (CMV) molecular test kit on the 3M™ Integrated ... The test is designed to enable hospital labs to ...
... AURORA, Colo., Nov. 15, 2011 In a strategic ... Redevelopment Authority (FRA) has completed a regimen of planning ... allocation of resources going forward. The announcement is made ... "Our first tactic in refocus involves augmenting our board ...
Cached Biology Technology:Nation's Best Health Care Organizations for Patient Satisfaction, Core Measures Honored by Press Ganey 2Nation's Best Health Care Organizations for Patient Satisfaction, Core Measures Honored by Press Ganey 3Quest Diagnostics CE Marks Simplexa™ Test for Cytomegalovirus for Sale in Europe 2Quest Diagnostics CE Marks Simplexa™ Test for Cytomegalovirus for Sale in Europe 3Fitzsimons Redevelopment Authority Rolls Out First Phase of Strategic Refocus With Appointment of Four Key Leaders in The Bioscience Industry to Its Board of Directors 2
(Date:9/12/2014)... 12, 2014 ... has announced the addition of the ... report to their offering. ,     (Logo: http://photos.prnewswire.com/prnh/20130307/600769) ... is a professional and in-depth study on ... lock industry. , ,The report provides a ...
(Date:9/12/2014)... Research and Markets ( ... the  "Global Facial Recognition Market (2D Facial ... - Industry Analysis, Size, Share, Growth, Trends ... their offering.      (Logo: http://photos.prnewswire.com/prnh/20130307/600769) ... was valued at USD 1.17 billion in ...
(Date:9/12/2014)... Sept. 12, 2014 Research and Markets ... IC Card Management System Industry Report 2014" report ... Card Management System Industry Report 2014 is a professional ... global IC card management system. The report ... classifications, applications and industry chain structure. The IC card ...
Breaking Biology News(10 mins):Global Fingerprint Lock Industry Report 2014 2Global Facial Recognition Market (2D Facial Recognition, 3D Facial Recognition, and Facial Analytics) - Trends and Forecast to 2020 2Global Facial Recognition Market (2D Facial Recognition, 3D Facial Recognition, and Facial Analytics) - Trends and Forecast to 2020 3Global IC Card Management System Industry Report 2014 2
... Ivaska (University of Turku and VTT Technical Research Centre of ... National Institute for Health and Welfare) have discovered that the ... a leading journal, the study concludes that SHARPIN regulates the ... prostate cancer cells. It is likely that the discovery will ...
... risk of extinction is a complicated task, especially for species ... University of Georgia and Tulane University have developed a mathematical ... appears in the early online edition of the Royal Society ... for a lot of species, we don,t know very much ...
... might lead to the development of better intervention methods, according ... published in the journal Substance Use & Misuse ... prompted college students to recall their smoking experience, and that ... and on weekends. "Students are using social events ...
Cached Biology News:New model more accurately describes migratory animals' extinction risk 2Research reveals when and why students smoke in effort to help them quit 2
... Spin Kit is an advanced system for isolating DNA ... can be used directly for any downstream application. ... ready to use in 56 minutes Low melting ... TAE and TBE gels No specialised equipment required ...
... incubators with rotators. Graduated, 35 mm ... plug-seal screw-cap with O-ring for a ... to accept different size hybridization membranes. ... separately. • Comp Dim: tube L ...
... The SpinPrep Gel DNA Kit enables efficient extraction of ... in size from agarose gels. The procedure uses GelMelt ... of the DNA to a silica membrane in a ... DNA is eluted in low-salt buffer. Each spin column ...
... is ideal for the ... (1D electrophoresis, 2D electrophoresis, ... Pharmacokinetics & Toxicology (whole ... chromatography); Physical and Material ...
Biology Products: