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:12/1/2015)... 2015 Cepheid (Nasdaq: CPHD ) today ... Piper Jaffray Healthcare Conference in New York ... reaffirming its outlook for the fourth quarter of 2015 ... discussing longer term business model expectations. John ... continue to be the fastest growing company of the ...
(Date:12/1/2015)... DUBLIN , December 1, 2015 /PRNewswire/ ... the addition of the  "2016 U.K. Virology ... Segment Forecasts for 100 Tests, Supplier Shares ... Opportunities"  report to their offering.  --> ... of the  "2016 U.K. Virology and Bacteriology ...
(Date:11/30/2015)... ... November 30, 2015 , ... Global Stem Cells Group announced the opening of ... cities of Arica and Iquique in northern Chile. The facilities are part of GSCG’s expansion ... advanced protocols and techniques in stem cell medicine to patients from around the world. , ...
(Date:11/30/2015)... , Nov. 30, 2015  Culprits beware, ... assistant chemistry professor Jan Halámek, is taking crime ...   --> ...   --> --> ... UAlbany have discovered a straightforward concept for identifying ...
Breaking Biology Technology:
(Date:11/10/2015)... LONDON , Nov. 10, 2015 /PRNewswire/ ... segmented on the basis of product, type, ... segments included in this report are consumables, ... this report are safety biomarkers, efficacy biomarkers, ... in this report are diagnostics development, drug ...
(Date:11/2/2015)...  SRI International has been awarded a contract of ... to the National Cancer Institute (NCI) PREVENT Cancer Program ... modern testing and support facilities, and analytical instrumentation to ... studies to evaluate potential cancer prevention drugs. ... Drug Development Program is an NCI-supported pipeline to bring ...
(Date:10/29/2015)... health pioneer, Joseph C. Kvedar , MD, describes ... wellness, and the business opportunities that arise from it ... Healthy Things . Long before health and wellness ... vice president, Connected Health, Partners HealthCare, was creating a ... the hospital or doctor,s office into the day-to-day lives ...
Breaking Biology News(10 mins):