Inkjet Printing of Magnetic Particles Toward Anisotropic Magnetic Properties.

Area of Science:

• Materials Science
• Nanotechnology
• Magnetism

Background:

• One-dimensional particle assemblies exhibit unique properties, especially for anisotropic magnetism.
• Inkjet printing is a method for creating patterned films, but the coffee-ring effect degrades uniformity and resolution.
• Controlling particle deposition is crucial for developing advanced nanostructured materials.

Purpose of the Study:

• To investigate the influence of an external magnetic field on particle deposition patterns during inkjet printing.
• To suppress the coffee-ring effect and improve the uniformity and resolution of printed ferromagnetic particle films.
• To explore the relationship between characteristic time scales and deposition morphology.

Main Methods:

• Formulation of ferromagnetic Gadolinium (Gd)5Si4 particles in terpineol oil.
• Magnetic field-assisted inkjet printing of particle-laden droplets onto photopaper.
• Analysis of particle deposition morphology based on solvent imbibition and magnetic field interactions.
• Consideration of characteristic times: solvent imbibition (t_im), particle chain formation (t_ch), and particle normal arrival (t_pz).

Main Results:

• Successful suppression of the coffee-ring effect using a magnetic field during inkjet printing.
• Demonstration of controlled particle deposition and assembly into patterned films.
• Identification of characteristic time ratios (t_pz/t_im and t_pz/t_ch) as key determinants of deposition morphology.

Conclusions:

• External magnetic fields offer effective control over particle deposition patterns in inkjet printing.
• This method allows for the creation of patterned films with enhanced uniformity and resolution.
• The ability to tune particle assembly provides a promising route to engineer magnetic anisotropic properties of nanostructured materials.