Abstract
Unique properties of one-dimensional assemblies of particles have attracted great attention during the past decades, particularly with respect to the potential for anisotropic magnetism. Patterned films can be created using inkjet printing; however, drying of particle-laden colloidal droplets on solid surfaces is usually accompanied by the well-known coffee-ring effect, deteriorating both the uniformity and resolution of the printed configurations. This study examines the effect of externally applied magnetic field on particle deposition patterns. Ferromagnetic Gd5Si4 particles were formulated in terpineol oil and directly deposited via magnetic field-assisted inkjet printing on a photopaper to generate patterned films with suppressed coffee-ring effect. The particle deposition morphology is determined by both solvent imbibition and particle-magnetic field interactions. Three characteristic times are considered, namely, the critical time for solvent imbibition into the substrate (tim), the time it takes for particles to form chains in the presence of the magnetic field (tch), and the time in which the particles reach the substrate in the direction normal to the substrate (tpz). The characteristic time ratios (tpz/tim) and (tpz/tch) determine the final deposition morphology in the presence of magnetic field. The ability to control particle deposition and assembly, thus tuning the magnetic anisotropic properties of nanostructured materials is a promising approach for many engineering applications.
Highlights
One-dimensional (1D) chain structures have attracted tremendous attention during the past decades owing to unique shape anisotropies and magnetic characteristics[1]
The main objective of this study is to elucidate the effect of external magnetic field on the magnetic particle assembly during inkjet printing to obtain anisotropic magnetic patterns through particle chaining with suppressed coffee-ring effect (CRE) formation
These characteristic times demonstrate the competition between particle chaining and deposition in the presence of magnetic field versus solvent imbibition, which are directly related to the morphology of the particle deposition
Summary
One-dimensional (1D) chain structures have attracted tremendous attention during the past decades owing to unique shape anisotropies and magnetic characteristics[1]. The chaining, or the formation of the so-called magnetosomes, is a result of intrinsic magnetic anisotropy, where magnetic particles orient and assemble with their easy magnetization axes (magnetization vectors) parallel to the magnetic field vector to minimize the magnetostatic energy of individual nanoparticles[6,7] This phenomenon combines the magnetic moments present in every magnetic particle in a particular direction, which is considered a promising venue for fabricating functional devices[8,9]. These characteristic times demonstrate the competition between particle chaining and deposition in the presence of magnetic field versus solvent imbibition, which are directly related to the morphology of the particle deposition Such ability to control the magnetic particle deposition and assembly through inkjet printing provides a great potential for many engineering and technological applications
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