Highly Dynamic Bistable Soft Actuator for Reconfigurable Multimodal Soft Robots (Adv. Mater. Technol. 2/2023)

Patel, Dinesh K.; Huang, Xiaonan; Luo, Yichi; Mungekar, Mrunmayi; Jawed, Mohammad; Yao, Lining; Majidi, Carmel

doi:10.1002/admt.202370006

Cited by 9 publications

(13 citation statements)

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“…For instance, bistable or multi-stable morphing matter-based systems can remain stable in different states without requiring a constant supply of external energy. [86][87][88] Here, energy is only necessary to overcome the energy barrier during the transition process. Besides energy conservation, these multi-stable mechanisms often help achieve faster motions such as jumping, snapping, and explosive dispersal by leveraging mechanical instability for power amplification in both engineered [89,90] and natural contexts.…”

Section: Usementioning

confidence: 99%

Sustainable Morphing Matter: Design and Engineering Practices

Patel,

Zhong,

et al. 2023

Adv Materials Technologies

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Morphing matter that change shapes and properties in response to external stimuli have gained significant interests in material science, robotics, biomedical engineering, wearables, architecture, and design. Along with functional advances, there is growing pressure and interest in considering the environmental impact of morphing matter during its life cycle. The unique manufacturing and usage of morphing matter means that existing sustainable design frameworks and principles for general physical products may not apply directly. For example, manufacturing morphing matter often requires designing and predicting materials' behaviors over time, and using devices fabricated with morphing matter often involves harnessing renewable energy and self‐reconfiguration, which pose unique sustainability opportunities and challenges. This study reflects and summarizes the field's practice in sustainable manufacturing, transport, use, and end‐of‐life handling of morphing matter. The term “sustainable morphing matter” (SMM) is coined, suggesting that sustainability‐conscious factors can become an integral component of morphing matter. In addition, ways to apply sustainability‐conscious factors to augment the existing design pipeline of morphing matter are presented, and more quantitative and algorithmic‐level developments are needed to apply these factors rigorously to the design process.

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Section: Usementioning

confidence: 99%

Sustainable Morphing Matter: Design and Engineering Practices

Patel,

Zhong,

et al. 2023

Adv Materials Technologies

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“…Integrating smart actuators with soft robots has yielded a plethora of intelligent smallscale soft robots exhibiting remarkable performance. [12][13][14][15][16] Among these, electrically stimulated soft robots exhibit rapid response speeds, making them suitable candidates for jumping applications. [17,18] Nonetheless, direct energy output jumping robots encounter challenges associated with limited instantaneous power output resulting from energy transfer inefficiencies within the system.…”

Section: Doi: 101002/advs202307088mentioning

confidence: 99%

“…Notably, the configuration of existing SMA actuators often relies on 1D wires and springs [26] due to constraints imposed by traditional processing methods. Achieving a snapping mechanism solely with 1D configurations presents challenges, necessitating the incorporation of additional mechanisms such as elastic laminations, [16,27,28] flexible hinges, [29,30] rigid linkages, [6,31] and curved metal laminations. [32] These additions increase the system's complexity and hinder the exploitation of the inherent advantages of the significant work-to-weight ratio offered by SMAs.…”

Section: Doi: 101002/advs202307088mentioning

confidence: 99%

Snapping for 4D‐Printed Insect‐Scale Metal‐Jumper

Yang,

Wang

2023

Advanced Science

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The replication of jumping motions observed in small organisms poses a significant challenge due to size‐related effects. Shape memory alloys (SMAs) exhibit a superior work‐to‐weight ratio, making them suitable for jumping actuators. However, the SMAs advantages are hindered by the limitations imposed by their single actuator configuration and slow response speed. This study proposes a novel design approach for an insect‐scale shape memory alloy jumper (net‐shell) using 4D printing technology and the bistable power amplification mechanism. The energy variations of the SMA net‐shell under different states and loads are qualitatively elucidated through a spring‐mass model. To optimize the performance of the SMA net‐shell, a non‐contact photo‐driven technique is employed to induce its shape transition. Experimental investigations explore the deformation response, energy release of the net‐shell, and the relationship between the light power density. The results demonstrate that the SMA net‐shell exhibits remarkable jumping capabilities, achieving a jump height of 60 body lengths and takeoff speeds of up to 300 body lengths per second. Furthermore, two illustrative cases highlight the potential of net‐shells for applications in unstructured terrains. This research contributes to miniaturized jumping mechanisms by providing a new design approach integrating smart materials and advanced structures.

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“…These structures are ferroelastic and ferromagnetic—the two ferroic properties enabling all multifunctionalities of these Heusler alloys. We further demonstrate a direct transfer of our approach to the NiTi system, the most applied shape memory alloy for actuator, [ 16–18 ] elastocaloric, [ 19 ] and biomedical applications. [ 16,20–22 ] Many other functional materials would also benefit from such an integration and we discuss this for the rich class of Heusler alloys, which exhibit extraordinary spintronic [ 23 ] and thermoelectric [ 24 ] properties.…”

Section: Introductionmentioning

confidence: 99%

Integration of Multifunctional Epitaxial (Magnetic) Shape Memory Films in Silicon Microtechnology

Fink,

Kar,

Lünser

et al. 2023

Adv Funct Materials

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Magnetic shape memory alloys exhibit various multifunctional properties, which range from high stroke actuation and magnetocaloric refrigeration to thermomagnetic energy harvesting. Most of these applications benefit from miniaturization and a single crystalline state. Epitaxial film growth is so far only possible on some oxidic substrates, but they are expensive and incompatible with standard microsystem technologies. Here, epitaxial growth of Ni–Mn–based Heusler alloys with single crystal‐like properties on silicon substrates is demonstrated by using a SrTiO3 buffer. It is shown that this allows using standard microfabrication technologies to prepare partly freestanding patterns. This approach is versatile, as its applicability for the NiTi shape memory alloy is demonstrated and spintronic and thermoelectric Heusler alloys are discussed. This paves the way for integrating additional multifunctional effects into state‐of‐the‐art microelectronic and micromechanical technology, which is based on silicon.

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Highly Dynamic Bistable Soft Actuator for Reconfigurable Multimodal Soft Robots (Adv. Mater. Technol. 2/2023)

Cited by 9 publications

References 0 publications

Sustainable Morphing Matter: Design and Engineering Practices

Sustainable Morphing Matter: Design and Engineering Practices

Snapping for 4D‐Printed Insect‐Scale Metal‐Jumper

Integration of Multifunctional Epitaxial (Magnetic) Shape Memory Films in Silicon Microtechnology

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