▎ 摘　　要

NOVELTY - Magnetocaloric ink formulation comprises 20-95 wt.% solids of magnetocaloric material, 5-80 wt.% solids polymeric binder, and at least one solvent, where the polymeric binder and solvents have a polymer-to-solvent ratio of 0.01-0.5 g/ml. The solvent comprises dichloromethane, ethylene glycol butyl ether, dibutyl phthalate, 2-butoxyethanol, or polyethylene glycol. The formulation further comprises: up to 10 wt.% thermally conductive additives; and at least one filler comprising nanoclay, graphene nanoplatelets, metal nanoparticles, or titanium (aluminum, silicon) carbide. The polymeric binder includes at least one polymer comprising polylactic acid, poly(lactic-co-glycolic) acid, polystyrene, or polyethylene oxide. USE - The formulation is useful for producing magnetocaloric structure through polymer-assisted three-dimensional printing and in magnetocaloric device (all claimed), e.g. magnetic cooling devices, magnetic heat pumps, for home and industrial grade refrigerators, electronics cooling, e.g. coolers, and heat exchangers or generators. ADVANTAGE - The formulation provides magnetocaloric devices which is manufactured by method that: are compositionally graded, anisotropically aligned magnetocaloric architectures with designed pores and channels, to bring forth significant improvement in heat exchange efficiency; utilizes alignment of magnetic particles by applying an external magnetic field during printing results in anisotropic magnetic crystallinity and enhances the magnetocaloric responses; allows for directly printing porous, compositionally-graded, magnetocaloric structures, with complex architectures; utilizes additives e.g. graphene nanoplatelets which enhance heat transfer and mechanical strength of the printed magnetocaloric devices, in addition to functioning as viscosity modifier for ink formulation; utilizes polymers act as binding agents for the magnetic particles, most of which are burned off during the post-treatment process; and utilizes printing methodology to achieves enhanced alignment in a magnetocaloric structure. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) producing magnetocaloric structure using the ink formulation, where the printing produces a structure comprised of magnetocaloric material with a retained magnetocaloric behavior; (2) the structure produced from the method; and (3) a magnetocaloric device that is compositionally graded, and has an anisotropically aligned magnetocaloric architecture with designed pores and channels. DESCRIPTION OF DRAWING(S) - The figure illustrates schematic view of magnetic-field-aided three-dimensional printing to align the magnetic particles to their easy axis of magnetization.