Voltage‐Controllable Magnetic Composite Based on Multifunctional Polyethylene Microparticles

Abstract

Micromagnets with collinear electric and magnetic dipole moments are embedded in a polymer to form a magnetic composite (see image). Each particle is a micromagnet that sits in a fluid‐filled cavity in which it is free to rotate. Under the application of a voltage, the multifunctional particles align with the applied electrostatic field to give rise to a net magnetization.

Surface-anisotropic spherical colloids in geometric and field confinement

“…An interesting situation arises, when the magnetic and electric moments of a Janus colloid are combined either in parallel or anti-parallel fashion. Gosh et al [67] combined two polyethylene hemispheres loaded with 220 nm TiO 2 (white) and 100 nm manganese ferrite (black), respectively, yielding a Janus colloid that has an electric dipole moment of~10 −19 C m and a small permanent magnetic moment. Depending on the orientation of the colloid during magnetization, the electric and magnetic moment in the final Janus colloid are parallel or anti-parallel.…”

Compartmentalization of Gold Nanocrystals in Polymer Microparticles using Electrohydrodynamic Co‐Jetting

“…[3,[5][6][7][8][9] So far, most of the interest related to anisotropic particles has been focused on the synthesis of Janus particles and a number of methods have been reported for the preparation of Janus particles including microfluidic techniques, flowfocusing lithography, the use of spinning disks, selective deposition, modification by partial masking, pickering emulsion, and self-assembly. [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] Recently, electrohydrodynamic (EHD) co-jetting of multiple polymer solutions with a side-by-side geometry has been used for synthesis of anisotropic particles and fibers with two or more distinct bulk compartments and surfaces.…”

Orientational Behavior of Ellipsoidal Silica‐Coated Hematite Nanoparticles Integrated within an Elastomeric Matrix and its Mechanical Reinforcement

“…As a result, bulk modification of the strength, stiffness, and toughness of the resulting materials are generally observed. [4,5] Different approaches have been reported in the past for the integration of nanoparticles within a polymer network leading to nanocomposites, including particle/polymer hydrogels, [6] particle/elastomer composites, [7][8][9][10] silicathermoset networks via in situ polymerization, [11] or linear polymer networks induced by particles. [12] In most cases, aggregation and migration of the integrated fillers under an external trigger (e.g., electrical field, magnetic field, or a high shear rate) appears as a drawback of this specific route.…”