Navigation Links
'Nanosculpture' could enable new types of heat pumps and energy converters

Troy, N.Y. A new technique for growing single-crystal nanorods and controlling their shape using biomolecules could enable the development of smaller, more powerful heat pumps and devices that harvest electricity from heat.

Researchers at Rensselaer Polytechnic Institute have discovered how to direct the growth of nanorods made up of two single crystals using a biomolecular surfactant. The researchers were also able to create "branched" structures by carefully controlling the temperature, time, and amount of surfactant used during synthesis.

"Our work is the first to demonstrate the synthesis of composite nanorods with branching, wherein each nanorod consists of two materials a single-crystal bismuth telluride nanorod core encased in a hollow cylindrical shell of single-crystal bismuth sulfide," said G. Ramanath, professor of materials science and engineering at Rensselaer and director of the university's Center for Future Energy Systems, who led the research project. "Branching and core-shell architectures have been independently demonstrated, but this is the first time that both features have been simultaneously realized through the use of a biomolecular surfactant."

Most nanostructures comprised of a core and a shell generally require more than one step to synthesize, but these new research results demonstrate how to synthesize such nanorods in only one step.

"Our single-step synthesis is an important development toward realizing large-scale synthesis of composite nanomaterials in general," said Arup Purkayastha, who worked on the project as a postdoctoral researcher at Rensselaer and is now a scientist with Laird Technologies in Bangalore, India.

Because of their attractive properties, core-shell nanorods are expected to one day enable the development of new nanoscale thermoelectric devices for power generation, as well as nanoscale heat pumps for cooling hot spots in nanoelectronics devices.

"Our discovery enables the realization of two very important attributes for heat dissipation and power generation from heat," Ramanath said. "First, the core-shell junctions in the nanorods are conducive for heat removal upon application of an electrical voltage, or generating electrical power from heat. Second, the branched structures open up the possibility of fabricating miniaturized conduits for heat removal alongside nanowire interconnects in future device architectures."

The researchers discovered that synthesis at high temperatures or with low amounts of the biomolecular surfactant L-glutathonic acid (LGTA) yields branched nanorod structures in highly regulated patterns. In contrast, synthesis at low temperatures or with high levels of LGTA results in straight nanorods without any branching. It is interesting to note that at the point of branching, atoms in the branch resemble a mirror image of the parent crystal a finding that reinforces Ramanath's conclusion that LGTA is able to induce branching through atomic-level sculpture.

"Since LGTA is similar to biological molecules, our discovery could be conceivably used as a starting point to explore the use of proteins and enzymes to atomically sculpt such nanorod architectures through biological processes," said Ramanath


Contact: Michael Mullaney
Rensselaer Polytechnic Institute

Related biology technology :

1. Discovery by UC Riverside physicists could enable development of faster computers
2. Carbon nanoribbons could make smaller, speedier computer chips
3. Commencement 2008: Student innovation could improve data storage, magnetic sensors
4. Melting defects could lead to smaller, more powerful microchips
5. Fiber-based nanotechnology in clothing could harvest energy from physical movement
6. New polymer could improve semiconductor manufacturing, packaging
7. AMDL Signs 100 Strategic Cooperation Agreements in China for Its JPGreen Clinics; Gross Sales Per Each Location Could Exceed $400,000
8. Hybrid semiconductors show zero thermal expansion; Could lead to hardier electronics
9. Multigene Test Predicts Who Could Avoid Chemotherapy Despite Positive Lymph Nodes in Early Breast Cancer
10. DelSite Nasal Powder Technology Could Reduce Recently Reported Waste in Federal Vaccine Program
11. Tethered to chip, energy supply that drives sperm could power nanobot
Post Your Comments:
Related Image:
'Nanosculpture' could enable new types of heat pumps and energy converters
(Date:10/13/2015)... ... October 13, 2015 , ... Proove ... to announce their partnership with the Keck Medicine of the University of ... , The T.R.O.J.A.N. Study (Therapeutic Evaluation to Research Clinical Objectives Linking Genotypic and ...
(Date:10/12/2015)... Carolina (PRWEB) , ... October 12, 2015 , ... Spirax ... announce the release of the CSM-C 600 compact clean steam generator . ... steam that meets the requirements of HTM2031, HTM2010, and EN285 standards. The CMS-C ...
(Date:10/12/2015)... , October 12, 2015 cell ... 6.49 billion by 2022, according to a new report by ... attributed to rise in incidence of oncology diseases and other ... is expected to reach USD 6.49 billion by 2022, ... This growth in demand can be attributed to rise in ...
(Date:10/12/2015)... CAESAREA, Israel , October 12, 2015 ... of the Dario™ Diabetes Management Solution, today announced its ... a patient case study at MobiHealth,s 5th EAI ... Focused on, "Transforming healthcare through innovations in mobile and ... London, England from October 14 - ...
Breaking Biology Technology:
(Date:9/30/2015)... PALM BEACH GARDENS, Fla. , Sept. 30, 2015 ... Circuit earlier this month issued another key ruling in ... Commission,s (ITC,s) determination that Korean fingerprint scanner company Suprema ... the Tariff Act of 1930, a trade provision that ... connection with import trade, by infringing two of Crossmatch,s ...
(Date:9/29/2015)... -- News facts: , ... , Minimized design shrinks PC footprint , ... embedded Fujitsu PalmSecure authentication enable enterprises to realize benefits ... that good things come in small packages, with the ... desktop and mobile portfolio. Featuring workplace design that favors ...
(Date:9/28/2015)... 2015 CLEAR, the leading biometric ... traveler service is coming to Austin-Bergstrom International ... a frictionless experience, serious speed and enhanced ... offers our travelers an expedited security screening ... Jim Smith , Executive Director, Austin-Bergstrom International ...
Breaking Biology News(10 mins):