WEB Self-assembled nanocomposite structural materials: when bottom-up meets top-down.Wednesday (01.01.2020) 00:30 - 00:45 Part of:
The integration of the exceptional properties of nanoparticles (NPs) into robust macroscopic materials requires manufacturing methods that achieve a precise control of composition and shape across several length scales. In this sense, colloidal assembly (CA) emerges as a successful bottom‐up approach allowing to tune the macroscopic behavior of the resulting engineered materials by specifically designing and controlling the interaction of the forming nano-building blocks.
Here, a CA-based strategy to produce supercrystalline hybrid nanocomposite materials with enhanced mechanical properties will be presented. The uniqueness of such approach lies in the close-packed structures that are obtained by self-assembly of nearly spherical organo-modified iron oxide NPs. The NP’s size and the resulting supercrystalline structures allow the organic ligand monolayer on the NPs’ surface to interdigitate and subsequently bridge by a thermally induced crosslinking reaction. Furthermore, by exchanging the NP’s surface ligands and the solvent used for the CA step, the final material’s properties can be modified. As a result, cm-sized nanocomposites with exceptional and tunable mechanical properties are obtained.
Finally, we will show how combining such self-assembly bottom-up approach with the options offered by additive manufacturing opens a new base for building-up hierarchical structural designs in a faster way. We will present a newly developed method -based on additive manufacturing combined with colloidal assembly (AMCA)- used to obtain supercrystalline macro-scale free-standing structures with remarkable mechanical properties.
With the aim of relating the used processing parameters with the materials’ nano- and micro-structure and with the final mechanical properties obtained, all materials hereby presented are characterized via a myriad of methods, ranging from imaging (Electron, X-Ray) to synchrotron-based techniques.
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