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Switching Between Crystallization and Amorphous Agglomeration of Alkyl Thiol-Coated Gold Nanoparticles

Geyer, Tihamer and Born, Philip and Kraus, Tobias (2012) Switching Between Crystallization and Amorphous Agglomeration of Alkyl Thiol-Coated Gold Nanoparticles. Physical Review Letters, 128302-1-128302-5. DOI: 10.1103/PhysRevLett.109.128302.

Full text not available from this repository.

Official URL: http://link.aps.org/doi/10.1103/PhysRevLett.109.128302

Abstract

Crystalline and amorphous materials composed of the same atoms exhibit strikingly different proper- ties. Likewise, the behavior of materials composed of mesoscale particles depends on the arrangement of their constituent particles. Here, we demonstrate control over particle arrangement during agglomeration. We obtain disordered and ordered agglomerates of the same alkyl thiol-coated gold nanoparticles depending on temperature and solvent. We find that ordered agglomeration occurs exclusively above the melting temperature of the ligand shells. Many-particle simulations show that the contact mechanics of the ligand shells dominate the order-disorder transition: Purely spherical particle-particle interactions yield order, whereas localized ‘‘stiction’’ between the ligand shells leads to disorder. This indicates that the ‘‘stickiness’’ and the packing of the agglomerates can be switched by the state of the ligand shells. It suggests that contact mechanics govern ordering in a wide range of nanoparticles.

Document Type:Article
Title:Switching Between Crystallization and Amorphous Agglomeration of Alkyl Thiol-Coated Gold Nanoparticles
Authors:
AuthorsInstitution or Email of Authors
Geyer, TihamerCenter for Bioinformatics, Saarland University, D–66041 Saarbruecken, Germany
Born, PhilipStructure Formation Group, INM—Leibniz Institute for New Materials, D–66123 Saarbruecken, Germany
Kraus, TobiasStructure Formation Group, INM—Leibniz Institute for New Materials, D–66123 Saarbruecken, Germany
Date:17 September 2012
Journal or Publication Title:Physical Review Letters
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI:10.1103/PhysRevLett.109.128302
Page Range:128302-1-128302-5
Status:Published
Keywords:Nanopartikel, Kristallisation, Strukturbildung
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):R - Vorhaben Materialwissenschaftliche Forschung
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Philip Born
Deposited On:02 Oct 2012 08:40
Last Modified:26 Mar 2013 13:42

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