Bubble inductors: Pneumatic tuning of a stretchable inductor

Lazarus, Nathan; Bedair, Sarah S.

doi:10.1063/1.5003372

Cited by 9 publications

(6 citation statements)

References 22 publications

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“…Lazarus et al. [ 54 ] presented a pneumatic chamber‐based tunable liquid metal inductor using stretchable liquid metal‐based conductors wrapped around a pneumatic bubble actuator (Figure 5d). The bubble inductor is manipulated through the collapsing/expanding of the pneumatic chamber, which influences the enclosed loop area and resulting coupling allowing tunability of the inductance.…”

Section: Inductorsmentioning

confidence: 99%

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Recent Advances in Deformable Circuit Components with Liquid Metal

Bury

Chun

Koh

2021

Adv Elect Materials

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Deformable electronics, specifically those incorporating liquid metal, allow for previously inaccessible mechanical behavior and exciting new technologies. This is demonstrated by recent, promising advances in the fabrication, characterization, device performance, and applications of liquid metal electronics. Through the use of liquid metals and soft, stretchable materials, it is shown that devices that provide stretchability and improved safety and comfort between humans and machines can achieve comparable or better electrical performance than conventional alternatives. Many of the latest major advances in liquid metal electronics focus on fundamental, deformable, passive circuit components and materials including capacitors, inductors, resistors, electrodes, wires, and composite materials, such as advances in biomimicry and deformation‐based sensing using both capacitors and inductors. Liquid metal passive components and materials have led to further progress in deformable secondary devices and applications such as antennas, actuators, power sources, and thermal management devices, including mechanical tuning for antennas, self‐sensing actuators, and power sources operational under stress. While deformable liquid metal electronics are still faced with challenges, the continued expansion of the field of liquid metal circuits is dramatically altering the research landscape of reconfigurable, self‐healable, and magnetically controllable electronics and revolutionalizing the way that electronics will be used in the future.

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Section: Inductorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Recent Advances in Deformable Circuit Components with Liquid Metal

Bury

Chun

Koh

2021

Adv Elect Materials

View full text Add to dashboard Cite

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“…These approaches are very influenced by the development of novel materials [58], device layouts [60], the study of different physical principles [61,62], and their application in various promising scenarios including the field of soft robotics [63]. From a transduction point of view, in addition to (piezo)resistive-based sensors [64][65][66], capacitive [67][68][69], optical [70,71], and inductive/magnetic [72][73][74][75] sensors have been demonstrated for wearable applications.…”

Section: Sensing Strategymentioning

confidence: 99%

Quasi-Passive Resistive Exosuit for Space Activities: Proof of Concept

et al. 2021

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The limits of space travel are continuously evolving, and this creates increasingly extreme challenges for the crew’s health that must be addressed by the scientific community. Long-term exposure to micro-gravity, during orbital flights, contributes to muscle strength degradation and increases bone density loss. In recent years, several exercise devices have been developed to counteract the negative health effects of zero-gravity on astronauts. However, the relatively large size of these devices, the need for a dedicated space and the exercise time-frame for each astronaut, does not make these devices the best choice for future long range exploration missions. This paper presents a quasi-passive exosuit to provide muscle training using a small, portable, proprioceptive device. The exosuit promotes continuous exercise, by resisting the user’s motion, during routine all-day activity. This study assesses the effectiveness of the resistive exosuit by evaluating its effects on muscular endurance during a terrestrial walking task. The experimental assessment on biceps femoris and vastus lateralis, shows a mean increase in muscular activation of about 97.8% during five repetitions of 3 min walking task at 3 km/h. The power frequency analysis shows an increase in muscular fatigue with a reduction of EMG median frequency of about 15.4% for the studied muscles.

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“…To achieve stretchability, intrinsically stretchable conductors, like liquid metal, ferrofluid/magnetic materials, , and serpentine-shaped nonstretchable metal lines were used. − These stretchable inductors exhibit excellent stretchability, − , and many of them can be conformally attached to nonplanar surfaces like skin. However, they also exhibit very low resonance frequencies (up to 200 MHz) and many of them were designed for 13.56 MHz operation. The only demonstration of GHz stretchable inductor fabricated using the compressive buckling method showed a relatively low quality factor ( Q ) (∼2).…”

Section: Introductionmentioning

confidence: 99%

“…Stretchable lumped inductors were demonstrated in previous reports. To achieve stretchability, intrinsically stretchable conductors, like liquid metal, 26 ferrofluid/magnetic materials, 27,28 and serpentine-shaped nonstretchable metal lines were used. 29−34 These stretchable inductors exhibit excellent stretchability, [26][27][28]34 and many of them can be conformally attached to nonplanar surfaces like skin.…”

Section: ■ Introductionmentioning

confidence: 99%

S- to X-Band Stretchable Inductors and Filters for Gigahertz Soft and Epidermal Electronics

Lan

Min

Kim

et al. 2021

ACS Appl. Mater. Interfaces

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To fulfill the increasing demand for radiofrequency (RF) wireless communication capacity for epidermal electronics, stretchable integrated circuits (ICs) in the gigahertz (GHz) range are desirable. Lumped RF inductors, as a key component in RFICs, typically dominate a large portion of the circuit/chip area and therefore make such inductors mechanically stretchable is critical for GHz-frequency stretchable RFICs. Most of the reported stretchable inductors operate in the MHz frequency range. The only GHz stretchable inductor shows a quality factor of about 2, limiting its potential RF applications. Here, stretchable inductors with a high quality factor of Q > 12.6 and resonance operation frequency of f res > 11.6 GHz are demonstrated by combining microspirals with stretchable structures, overcoming all of the shortcomings of previous demonstrations. Furthermore, a stretchable 1.5–2.6 GHz filter with a peak insertion loss of −2.3 dB at 1.8 GHz is developed, showing negligible performance changes under stretching or on the skin to demonstrate the utility in practical wireless applications like GSM and Bluetooth (2.45 GHz) bands. The demonstrations can facilitate multiple GHz epidermal RFICs in the future.

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Bubble inductors: Pneumatic tuning of a stretchable inductor

Cited by 9 publications

References 22 publications

Recent Advances in Deformable Circuit Components with Liquid Metal

Recent Advances in Deformable Circuit Components with Liquid Metal

Quasi-Passive Resistive Exosuit for Space Activities: Proof of Concept

S- to X-Band Stretchable Inductors and Filters for Gigahertz Soft and Epidermal Electronics

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