Magnetic and structural properties of magnetic colloids with a well-developed system of magnetized aggregates

Dikansky, Yuri; Gladkikh, D. V.; Zakinyan, Anastasia A.; Ispiryan, A. G.

doi:10.1016/j.molliq.2020.114171

Cited by 5 publications

(3 citation statements)

References 35 publications

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“…[60][61][62] This creates a uniaxial magnetic anisotropy characterized by a magnetic easy axis (i.e., the major axis of the chains) along which the magnetic moments of single NPs are preferentially oriented, thereby forming an extended magnetic dipole in the chain. [61][62][63] This is particularly advantageous in light-activated technologies, and it can be exploited to actuate the printed object. Indeed, if an angle exists between the applied external magnetic field and the magnetic easy axis of the chains, a torque is exerted, which forces the object to rotate to align itself along the field vector.…”

Section: Introductionmentioning

confidence: 99%

“…Indeed, if an angle exists between the applied external magnetic field and the magnetic easy axis of the chains, a torque is exerted, which forces the object to rotate to align itself along the field vector. [63][64][65] Therefore, controlling the orientation of the magnetic microstructure allows programming the rotation and bending movements of the printed objects. So far, this approach has been mainly employed in 2D fabrication processes, [66][67][68][69] in particular using a photolithographic approach, with the fabrication of multimodal microactuators.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Magnetoresponsive Devices with Programmable Behavior Using a Customized Commercial Stereolithographic 3D Printer

Lantean

Roppolo

Sangermano

et al. 2022

Adv Materials Technologies

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The revolution of 4D printing allows combining smart materials to additive processes to create behavioral objects able to respond to external stimuli, such as temperature, light, electrical, or magnetic fields. Here, a modified commercial digital light processing (DLP) 3D printer is used to obtain complex macroscopic remotely controlled gear‐based devices. The fabrication process is based on the printing of magnetoresponsive polymers containing in situ self‐assembled microstructures, i.e., composed of oriented chains of Fe3O4 nanoparticles (NPs). First, it is demonstrated that magnetoresponsive hammer‐like actuators with different stiffness can be printed allowing both pure rotation or/and bending motions. Then, the microstructure to create a magnetoresponsive gear is exploited. In particular, this work shows that they can be successfully used to transfer torque to other gears, thereby converting a rotation movement into linear translation. Finally, it is demonstrated that magnetoresponsive gears can also be combined with other nonmagnetic elements to create complex assemblies, such as gear‐trains, linear actuators, and grippers that can be remotely controlled.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Magnetoresponsive Devices with Programmable Behavior Using a Customized Commercial Stereolithographic 3D Printer

Lantean

Roppolo

Sangermano

et al. 2022

Adv Materials Technologies

View full text Add to dashboard Cite

show abstract

“…Indeed, when magnetic particles are dispersed within a liquid medium and exposed to a uniform magnetic field, their magnetic dipoles arrange in a head-to-tail configuration [45][46][47]. The magnetic forces produced in such systems lead to the spontaneous assembling of NPs in chain-like structures aligned along the field vector [48][49][50][51][52][53]. The shape of the elongated aggregates creates a magnetic anisotropy characterized by a preferential magnetization direction, i.e.…”

Section: Introductionmentioning

confidence: 99%