Physics of shell assembly: Line tension, hole implosion, and closure catastrophe

The self-assembly of perfectly ordered closed shells is a challenging process involved in many biological and nanoscale systems. However, most of the aspects that determine their formation are still unknown. Here we investigate the growth of shells by simulating the assembly of spherical structures...

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Bibliographic Details
Published in:The Journal of chemical physics 2012-05, Vol.136 (18), p.184507-184507-7
Main Authors: Luque, Antoni, Reguera, David, Morozov, Alexander, Rudnick, Joseph, Bruinsma, Robijn
Format: Article
Language:English
Subjects:
Assembly
Closures
Implosions
Models, Molecular
Molecular Conformation
Nanocomposites
Nanomaterials
Nanostructure
Self assembly
Shells
Surface Properties
Thermodynamics
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Summary:The self-assembly of perfectly ordered closed shells is a challenging process involved in many biological and nanoscale systems. However, most of the aspects that determine their formation are still unknown. Here we investigate the growth of shells by simulating the assembly of spherical structures made of N identical subunits. Remarkably, we show that the formation and energetics of partially assembled shells are dominated by an effective line-tension that can be described in simple thermodynamic terms. In addition, we unveil two mechanisms that can prevent the correct formation of defect-free structures: "hole implosion," which leads to a premature closure of the shell; and "closure catastrophe," which causes a dramatic production of structural disorder during the later stages of the growth of big shells.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.4712304