Effect of Polymer-Graft Modification on the Order Formation in Particle Assembly Structures

The propensity of particle brush materials to form long-ranged ordered assembly structures is shown to sensitively depend on the brush architecture (i.e., the particle radius as well as molecular weight and grafting density of surface-bound chains). In the limit of stretched chain conformations of s...

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Bibliographic Details
Published in:Langmuir 2013-05, Vol.29 (21), p.6452-6459
Main Authors: Choi, Jihoon, Hui, Chin Ming, Schmitt, Michael, Pietrasik, Joanna, Margel, Shlomo, Matyjazsewski, Krzysztof, Bockstaller, Michael R
Format: Article
Language:English
Subjects:
Chemistry
Colloidal state and disperse state
Cross-Linking Reagents - chemical synthesis
Cross-Linking Reagents - chemistry
Exact sciences and technology
General and physical chemistry
Molecular Structure
Organogold Compounds - chemical synthesis
Organogold Compounds - chemistry
Particle Size
Physical and chemical studies. Granulometry. Electrokinetic phenomena
Polymers - chemical synthesis
Polymers - chemistry
Quantum Theory
Sulfhydryl Compounds - chemistry
Surface Properties
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Summary:The propensity of particle brush materials to form long-ranged ordered assembly structures is shown to sensitively depend on the brush architecture (i.e., the particle radius as well as molecular weight and grafting density of surface-bound chains). In the limit of stretched chain conformations of surface-grafted chains the formation of regular particle array structures is observed and interpreted as a consequence of hard-sphere-type interactions between polymer-grafted particles. As the degree of polymerization of surface-grafted chains increases beyond a threshold value, a reduction of the structural regularity is observed that is rationalized with the increased volume occupied by relaxed polymer segments. The capacity of polymer grafts to increase or decrease order in particle brush assembly structures is interpreted on the basis of a mean-field scaling model, and “design criteria” are developed to help guide the future synthesis of colloidal systems that are capable of forming mechanically robust yet ordered assembly structures.
ISSN:0743-7463
1520-5827
DOI:10.1021/la4004406