Janus particles are compartmentalised objects with different, usually even opposite, chemical make-ups on their two hemispheres, which make them a unique class of materials at the meso- and nanoscale. The name is reminiscent of Janus the ancient Roman god with two heads looking in opposite directions, simultaneously forward to the future and backward to the past.First made by Casagrande and Veyssie (Compt Rend Ac Sci 306:1423, 1988) of one hydrophilic and one hydrophobic hemisphere, raised to an international attention as “new animals with a polar and an apolar face” by de Gennes in his Nobel lecture, Janus particles are acquiring more and more importance because of their wide range of technological applications. Thanks to their toposelective and functionalised coating, they are utilised as surfactants, drug-delivers and catalysts. The flexibility proper of soft matter has been thought to be applied to bimetallic nanoalloys where the Janus motif represents a layered segregation effect leading to two different chemical regions in the cluster. Janus nanoalloys have been proposed in magneto-optical applications, such as structural colourations on textile, and as flip-flop switchers in the presence/absence of a magnetic field.The numerical modelling of Janus particles is a useful tool to understand and drive their synthesis and preparation. In this chapter, the attention is focused, but not limited, on the modelling of the growth of bi-comparmentalised nanoalloys, where the cases of gold–platinum (AgPt) and silver–cobalt (AgCo) are presented as paradigmatic examples.

Modelling Janus Nanoparticles / F. Baletto (NANOSTRUCTURE SCIENCE AND TECHNOLOGY). - In: Metal Clusters and Nanoalloys : From Modeling to Applications / [a cura di] M.M. Mariscal, O.A. Oviedo, E.P.M. Leiva. - [s.l] : Springer, 2013. - ISBN 9781461432678. - pp. 243-273 [10.1007/978-1-4614-3643-0_8]

Modelling Janus Nanoparticles

F. Baletto
2013

Abstract

Janus particles are compartmentalised objects with different, usually even opposite, chemical make-ups on their two hemispheres, which make them a unique class of materials at the meso- and nanoscale. The name is reminiscent of Janus the ancient Roman god with two heads looking in opposite directions, simultaneously forward to the future and backward to the past.First made by Casagrande and Veyssie (Compt Rend Ac Sci 306:1423, 1988) of one hydrophilic and one hydrophobic hemisphere, raised to an international attention as “new animals with a polar and an apolar face” by de Gennes in his Nobel lecture, Janus particles are acquiring more and more importance because of their wide range of technological applications. Thanks to their toposelective and functionalised coating, they are utilised as surfactants, drug-delivers and catalysts. The flexibility proper of soft matter has been thought to be applied to bimetallic nanoalloys where the Janus motif represents a layered segregation effect leading to two different chemical regions in the cluster. Janus nanoalloys have been proposed in magneto-optical applications, such as structural colourations on textile, and as flip-flop switchers in the presence/absence of a magnetic field.The numerical modelling of Janus particles is a useful tool to understand and drive their synthesis and preparation. In this chapter, the attention is focused, but not limited, on the modelling of the growth of bi-comparmentalised nanoalloys, where the cases of gold–platinum (AgPt) and silver–cobalt (AgCo) are presented as paradigmatic examples.
Monte Carlo; Cobalt Concentration; Kinetic Monte Carlo; Bimetallic Cluster; Parent Cluster
Settore FIS/03 - Fisica della Materia
Book Part (author)
File in questo prodotto:
File Dimensione Formato  
Chapter8-Janus.pdf

accesso riservato

Tipologia: Post-print, accepted manuscript ecc. (versione accettata dall'editore)
Dimensione 15.15 MB
Formato Adobe PDF
15.15 MB Adobe PDF   Visualizza/Apri   Richiedi una copia
Pubblicazioni consigliate

Caricamento pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/865372
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? ND
social impact