Printing 1D Assembly Array of Single Particle Resolution for Magnetosensing

Abstract

Magnetosensing is a ubiquitous ability for many organism species in nature. 1D assembly, especially that arranged in single-particle-resolution regulation, is able to sense the direction of magnetic field depending on the enhanced dipolar interaction in the linear orientation. Inspired by the magnetosome structure in magnetotactic bacteria, a 1D assembly array of single particle resolution with controlled length and well-behaved configuration is prepared via inkjet printing method assisted with magnetic guiding. In the fabrication process, chains in a "tip-to-tip" regulation with the desired number of particles are prepared in a confined tiny inkjet-printed droplet. By adjusting the receding angle of the substrate, the assembled 1D morphology is kept/deteriorated depending on the pinning/depinning behavior during ink evaporation, which leads to the formation of well-behaved 1D assembly/aggregated dot assembly. Owing to the high-aspect-ratio characteristic of the assembled structure, the as-prepared 1D arrays can be used for magnetic field sensing with anisotropic magnetization M /M up to 6.03.

Inkjet Printing of Magnetic Particles Toward Anisotropic Magnetic Properties

“…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 .…”

3D Rotation‐Trackable and Differentiable Micromachines with Dimer‐Type Structures for Dynamic Bioanalysis

“…[1][2][3][4] The assembly process can be driven by the spontaneous or directed organization of random building blocks to form ordered structures through localized interactions. Depending on the properties of the building elements, the assembled structures can be endowed with peculiar functions, enabling applications in sensors, [5] actuators, [6,7] photonics, [8,9] and electronics. [10,11] Discrete magnetically actuated assembly structures [12][13][14][15] are preferred for nontethered and contactless operations, flexible motility, and insensitivity to ambient environment, such as temperature, ionic strength, and conductivity, enabling applications in microactuators, motors, and robotic devices.…”

“…[ 1–4 ] The assembly process can be driven by the spontaneous or directed organization of random building blocks to form ordered structures through localized interactions. Depending on the properties of the building elements, the assembled structures can be endowed with peculiar functions, enabling applications in sensors, [ 5 ] actuators, [ 6,7 ] photonics, [ 8,9 ] and electronics. [ 10,11 ]…”

Rheology-Assisted Microstructure Control for Printing Magnetic Composites—Material and Process Development

“…Anisotropy in thermal conductivity has been achieved by orienting ferromagnetic particles in epoxy resin, applying an external magnetic field where the chain-like microstructures serve as enhanced heat flow paths [ 16 ]. Inkjet-printed one-dimensional arrays of monodisperse Fe 3 O 4 nanoparticles with high anisotropic magnetization with possible applications for magnetic field sensing has been demonstrated in the technical literature [ 17 ]. Composites 3D printed and poled, applying an external magnetic field, utilizing strontium ferrite particles dispersed in SU8 photoresist, have been observed to be suitable for onboard integration of magnetic components in millimeter-wave circuits [ 18 ].…”