Exploring the Frontiers of Polymer Science and Technology: From Fundamentals to Applications (English)
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Investigation on the Self-Assembly Behavior of Polymer-Grafted Nanocrystals
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Colloidal inorganic nanocrystals (NCs) hold great potential as building blocks for the creation of intricate and functionally rich metamaterials. A crucial aspect involves understanding the self-assembly behavior of NCs to effectively control the properties of nanocomposites, as this organization profoundly affects the properties of resultant nanocomposites. In this presentation, I will discuss the self-assembly of polystyrene-grafted gold NCs (Au@PS) into ordered arrays. Au@PS NCs show non-conventional self-assembly behavior that they can form close-packed symmetries of hcp and fcc despite their large particle softnesses, which is difficult to be explained by traditional NC assembly models. To account for this phenomenon, we developed an “effective softness” model that considers the concentrated polymer brushes (CPB) surrounding the NC surface as part of the “hard core.” Using this model, we can accurately predict the self-assembly behavior and interparticle distances of NC superlattices. These findings highlight the importance of ligand conformation on NC surfaces for sophisticated design of NC based materials.