Chemical Bonding Assembly of Multifunctional Oxide Nanocomposites

Abstract

The synthesis, functionalization and assembly of metal oxide nanoparticles BaTiO3 and CoFe2O4 is presented. The ferroelectric (BaTiO3) and ferromagnetic (CoFe2O4) oxide nanoparticle surfaces are directly functionalized via the anchoring of phosphonic acid and aminosilane molecules that engender the nanoparticles with terminal carboxylic acid and amine functional groups, respectively. These promote the electrostatic self-assembly of the particles in non-polar solvents and permit the synthesis of more chemically robust assemblies linked by the covalent amide bond via the addition of the chemical coupling agent N-N'-dicyclohexylcarbodiimide. This functionalization and assembly procedure is applied to two systems: the first comprised of 50?nm BaTiO3 and 10?nm CoFe2O4 particles and the second of 200?nm BaTiO3 and 12.5?nm CoFe2O4 particles. The latter composites possess magnetoelectric properties when processed into dense ceramics and, as a direct result of the assembly performed in solution, have a high degree of homogeneity between the ferroelectric and ferromagnetic phases. The developed functionalization and assembly procedure is considered to be adaptable to the preparation of other hybrid oxide nanomaterials with different property combinations

Polymer‐Based Magnetoelectric Materials

“…The synthesis of the magnetostrictive nanoparticles used in polymer‐based ME particulate nanocomposites is well discussed in the literature 52–57. On the other hand, the interface effects between nanoparticles and the polymer matrix has received only little attention.…”

Challenges in Ceramic Science: A Report from the Workshop on Emerging Research Areas in Ceramic Science

“…Tailored fabrication of novel ceramic materials composed of periodic arrays of micro‐ and nanoscale phases is still in its infancy. For example, it has been shown that chemical functionalization and bonding can be used to predictably assemble distinctly different sets of oxide nanoparticles . Approaches such as these can offer general fabrication platforms to produce dense hybrid composites with property combinations of interest in a broad range of applications including energy storage, photon harvesting, and catalysis.…”

Synthesis of nanostructured framework of novel ZnBaO2 nanopowder via wet chemical approach and hepatocytotoxicity response

“…The structural parameters play a crucial role in determining and optimizing the sensor-related properties (Calfen and Mann 2003;Tretyakov 2003;Rawle 2007;Perry and Carter 2006;Evans et al 2010;Colfen and Antonietti 2005;Demortière et al 2008;Shevchenko et al 2006;Koziej et al 2014;Ansari et al 2014). In order to achieve desired shape and size with enhanced functional properties, bottom-to-top wet chemical approach was undertaken to synthesize functional nanopowder for their chemical and biological studies.…”