The soft NdFeB/Ecoflex composites for soft robot with a considerable magnetostimulated shrinkability

Wu, Zhenhua; Wang, Qi; Huang, Jianyu; Yue, Yamei; Chen, Dezhi; Shi, Yusheng; Su, Bin

doi:10.1016/j.compscitech.2021.109129

Cited by 23 publications

(5 citation statements)

References 44 publications

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“…So that they are able to change their shapes and forms, squeeze through confined spaces, and manipulate objects dexterously to adapt to different tasks and environments. [2] Elastomeric materials generally include hydrogels, [3][4][5] hyperelastic materials, [6][7][8] dielectric elastomeric materials, [9][10][11] polydimethylsiloxane (PDMS), [12] carbonbased materials, [13][14][15] shape-memory alloys, [16][17][18] shape-memory polymers, [19] and other flexible materials, which are well suited for applications under specific conditions. However, hydrogel and carbon-based materials have poor mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

3D Printing Bio‐Inspired Micro Soft Robot with Programming Magnetic Elastic Composites

Peng,

Zhang,

Wang

et al. 2024

Adv Materials Technologies

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Bio‐inspired micro soft robots mimic biologically specific body structures and movement mechanisms by utilizing bionic principles. Because of its soft body, it can adapt to complex external environments. However, the existing polymer material system is single and the fabrication process is limited. How to further reduce soft robot size has become a key issue. In this work, a Programming Magnetic Elastic Composites (PMEC) is proposed for 3D printing to manufacture micro soft robots. The PMEC has the advantage of changing the direction of the internal magnetic field in response to changes in the external magnetic field. A Microsoft robot is designed and fabricated using PMEC inspired by an inchworm. Numerical simulations are also used to study the effect of soft robot size parameters on local stresses and optimize the structure. The results show that the microscale soft robot can crawl with a load of 2 times its weight at a speed of 6.67 mm s−1, crawl on slopes from 0° to 90°, and crawl over obstacles with a maximum height of 7 mm. In addition, active adaptation of soft robots to complex tunnel models based on external stimuli is achieved by magnetic field control.

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Section: Introductionmentioning

confidence: 99%

3D Printing Bio‐Inspired Micro Soft Robot with Programming Magnetic Elastic Composites

Peng,

Zhang,

Wang

et al. 2024

Adv Materials Technologies

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“…Currently, there are various methods for preparing sensors, and additive manufacturing has gained significant attention due to its high accuracy and relatively low cost. − One of these methods is direct ink writing (DIW), which has the advantage of being highly adjustable in terms of material, allowing for the printing of customized inks as required. − The viscosity of the ink is typically adjusted using solid thickeners, photosensitive coupling agents, or other means to make it suitable for printing. − Integrated soft electronics can be produced by printing a mixture of different inks in a controlled manner. For instance, combining conductive and dielectric elastomeric inks in an additive manufacturing platform can create soft electronics. , However, current integrated sensors do not consider the impact of the external environment on their service life in specific usage scenarios.…”

Section: Introductionmentioning

confidence: 99%

Pressure-Activatable Liquid Metal Composites Flexible Sensor with Antifouling and Drag Reduction Functional Surface

Ma,

Lu,

et al. 2023

ACS Appl. Mater. Interfaces

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Flexible sensors produced through three-dimensional (3D) printing have exhibited promising results in the context of underwater sensing detection (for applications in navigational vehicles and human activities). However, underwater vehicles and activities such as swimming and diving are highly susceptible to drag, which can cause negative impacts such as reduced speed and increased energy consumption. Additionally, microbial adhesion can shorten the service life of these vehicles. However, natural organisms are able to circumvent such problems, with shark skin offering excellent barrier properties and ruffled papillae providing effective protection against fouling. Here, we show that a sandwich system consisting of a spraying layer, conductive elastomer composite, and encapsulation layer can be printed for multifunctional integrated underwater sensors. The modulated viscoelastic properties of liquid metal form the foundation for printing features, while its pressure-activated properties offer the potential for switchable sensors. An integrated drag reduction and antifouling layer were created by combining the shark skin surface shield scale structure with the lotus leaf surface papillae structure. A 3D-printed flexible sensor was designed using our approach to monitor attitude changes and strain in underwater environments, showcasing its capabilities. Our printed sensors can reduce biological attachment density by more than 50% and reduce underwater drag by 8.6−10.3%.

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“…Magnetic fillers widely used in the literature include spherical shaped magnetic particles (such as iron oxide [14,15] and NdFeB [16,17] ) that lack shape anisotropy and thus require a high loading of magnetic material or the use of strong fields to achieve a noticeable response. In order to achieve significant actuation and effective transduction of magnetic field energy into mechanical energy, it is important to have a high remanent magnetic moment.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Magnetic Anisotropy for Reprogrammable High‐Force‐Density Microactuators

Chen,

Srinivasan,

Choates

et al. 2023

Adv Funct Materials

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The precise control of magnetic properties at the microscale has transformative potential in healthcare and human‐robot interaction. This research focuses on understanding the magnetic interactions in nanostructure assemblies responsible for microactuation. By combining experimental measurements and micromagnetic simulations, the interactions in both nanocube and nanochain assemblies are elucidated. Hysteresis measurements and first‐order reversal curves (FORC) reveal that the spatial arrangement of these assemblies governs their collective magnetism. A critical concentration threshold is observed where a transition from ferromagnetic‐like to antiferromagnetic‐like coupling occurs. Leveraging the high uniaxial anisotropy of 1D nanochains, the remanent magnetization of assembled chain structures is maximized for efficient magneto‐mechanical energy transduction. By utilizing an optimized magnetic nanostructure concentration, a flexible film is fabricated, and its significantly enhanced mechanical deformation response to a small magnetic field, surpassing conventional particle‐based samples by a factor of five, is demonstrated. Demonstrating excellent transduction efficiency, visible deformations such as bending and S‐shaped twisting modes are achieved with an applied field of less than 400 Oe. Furthermore, the reprogrammability of the actuator, achieving a U‐shaped bending mode by altering its magnetization profile, is showcased. This research provides valuable insights for designing reconfigurable and effective microactuators and devices at significantly smaller scales than previously possible.

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The soft NdFeB/Ecoflex composites for soft robot with a considerable magnetostimulated shrinkability

Cited by 23 publications

References 44 publications

3D Printing Bio‐Inspired Micro Soft Robot with Programming Magnetic Elastic Composites

3D Printing Bio‐Inspired Micro Soft Robot with Programming Magnetic Elastic Composites

Pressure-Activatable Liquid Metal Composites Flexible Sensor with Antifouling and Drag Reduction Functional Surface

Enhanced Magnetic Anisotropy for Reprogrammable High‐Force‐Density Microactuators

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