WEB Advanced fabrication methods for bio-inspired functional materialsTuesday (22.09.2020) 10:40 - 10:55 Z: Special Symposia I Part of:
Nature is full of examples of functional materials in which the macroscale properties are defined and tailored by complex nanostructures. Moreover, nature has evolved in way by which its structures often present multifunctionalities, as for example the shark skin, which has both biofouling properties and hydrodynamic function. Research groups have pursuit the multi-scale assembly and control of nanostructures and nanocomposites to achieve novel and multifunction materials. For synthetic materials, the 3D structural parameters, composition and properties are directly dependent on the fabrication process. Colloidal processing is a versatile route to produce bioinspired materials and has the advantage of enabling the fabrication of multi compositional structures, comprising, for example, ceramic and polymeric materials.
Here, bio-inspired ceramic-based materials and ceramic-organic composites for enhanced optical and mechanical applications will be presented. The colloidal assembly of sub-micron and nanoparticles into 3D structures followed by controlled post-treatments enable the tuning of properties, such as the materials reflectance or bending strength. High-temperature stable non-iridescent structural colors were produced by assembly of monodisperse polystyrene (PS) spheres followed by atomic layer deposition (ALD), as well as by controlled heterocoagulation of yttria-stabilized zirconia (YSZ) nanoparticles and PS. We show that the wavelength range at which the reflectivity is maximized can be tailored according to the PS initial particle size and the shell thickness, which is controlled either by the YSZ/PS ratio and the suspension pH or by the ALD cycle number. ALD is also used to increase the structures’ stability up to 1000 °C.
At last, we demonstrate the fabrication of mechanical metamaterials by additive manufacturing combined with colloidal assembly (AMCA). By this method, colloidal assembly of organic-functionalized ceramic nanoparticles is combined with direct-writing to produce mm-sized columns with remarkable bending strength.
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