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Thursday, 08 December 2011

Carving at the Nanoscale, SCIENCE, 334 (2011)

Researchers at the Catalan Institute of Nanotechnology (ICN) have successfully demonstrated a new method for producing a wide variety of complex hollow nanoparticles. The work has been published in Science.

A common theme in nanoscience research is the recycling of "old" processes and protocols that were once applied crudely on bulk materials in trades and industrial settings, but which can now be applied to nano-sized structures with high precision and resolution using newly available instruments and know-how. After several years of research, scientists of the Catalan Institute of Nanotechnology (ICN), Dr. Edgar Emir Gonzalez (currently at Instituto Geofisico Universidad Javeriana y Universidad Santo Tomas) and ICREA Prof. Victor Puntes in collaboration with ICREA Prof. Jordi Arbiol of the Institute of Materials Science of Barcelona (ICMAB-CSIC), have refined methods based on traditional corrosion techniques (the Kirkendall effect and galvanic, pitting, etching and de-alloying corrosion processes). They show that these methods, which are far more aggressive at the nanoscale than in bulk materials due to the higher surface area of nanostructures, provide interesting pathways for the production of new and exotic materials. By making simple changes in the chemical environment it is possible to tightly control the reaction and diffusion processes at room temperatures, allowing for high yields and high consistency in form and structure. This should make the processes particularly attractive for commercial applications as they are easily adapted to industrial scales. A wide range of structures can be formed, including open boxes, bimetallic and trimetallic double-walled open boxes with pores, multiwalled/multichamber boxes, double-walled, porous and multichamber nanotubes, nanoframes, noble metal fullerenes, and others.

Asides from their intrinsic beauty, such nanostructures present new ooptions for drug delivery, catalysis, remediation of contaminants and even structural components for nanoscale robots.

“Carving at the Nanoscale: Sequential Galvanic Exchange and Kirkendall Growth at Room Temperature”

Science, 334 num.6061, 1377-1380 - DOI: doi/10.1126/science.1212822.

Edgar Gonzalez 1,2*, Jordi Arbiol 3,4, Victor Puntes 1,2,4,5+

1 Institut Catala de Nanotecnologia (ICN), Campus de la UAB, 08193, Bellaterra, Spain.; 2 Universitat Autonoma de Barcelona (UAB), Campus de la UAB,08193, Bellaterra ,Spain; 3 Institut de Ciencia de Materials de Barcelona (ICMAB-CSIC), Campus de la UAB, 08193 Bellaterra, Spain.; 4 Institució Catalana deRecerca i Estudis Avancats (ICREA), Passeig Lluis Companys, 23, 08010 Barcelona, Spain; 5 Centre d`Investigacions en Nanociencia i Nanotecnologia CIN2(ICN-CSIC), Campus UAB, 08193 Bellaterra, Spain.* Present address: Seccion de Nanociencia y Nanotecnologia Pontificia Universidad Javeriana, 110231 Bogota Colombia. Universidad Santo Tomas, Bogota



Inorganic Nanoparticles Group