Abstract
Colloidal processing offers the advantage of controlling the interactions between particles. Nanometer is the critical length scale for interparticle interactions. Modification of interparticle separation in the nanometer range plays a critical role in the properties of particulate suspensions. We have developed a nanocoating method that modifies the surface chemistry of ceramic powders. The nanocoating serves multiple purposes. It enhances the chemical and thermal stability of the powders, improves the consolidation and rheological properties of slurries, increases the homogeneous distribution of processing additives, and lowers the sintering temperatures of the green compacts. for example, we showed that boehmite (AlOOH)-coated silicon nitride and silicon carbide powders have a significantly higher solids loading than the uncoated powders in water. Coated suspensions have lower viscosity and wider linear viscoelastic region, and lower shear modulus than that of uncoated suspensions. With an increasing coating thickness, the shear modulus of coated suspensions decreases indicating the coating prevents close contact of core particles thereby reducing the van der Waals attraction interaction between the core particles. Boehmite coating is shown to enhance the thermal stability of catalytic oxide ZrO2. Coating of Mg(OH)2 layer on Nb2O5 particles facilitates the synthesis of pyrochlore-free perovskite lead manganese niobate (PMN) powders by a single heat-treatment step. Normally this must be done in two heat-treatment steps as in the columbite process. More recently, the coating technique has been used to fabricate piezoelectric PMN-PT thick-film sensors. Piezoelectric-metal bimorphs have been fabricated to detect yeast cells and biotinylated polystyrene spheres with a sensitivity of 10−9 g/Hz.
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Shih, WH., Shih, W.Y., Yang, CY., Gu, H., Yi, J.W. (2003). Nanocoating of Particulate Surface in Colloidal Processing for Piezoelectric Sensors Applications. In: Gogotsi, Y.G., Uvarova, I.V. (eds) Nanostructured Materials and Coatings for Biomedical and Sensor Applications. NATO Science Series, vol 102. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-0157-1_39
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DOI: https://doi.org/10.1007/978-94-010-0157-1_39
Publisher Name: Springer, Dordrecht
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