When Flexoelectricity Drives Triboelectricity

Mizzi, Christopher A.; Marks, Laurence D.

doi:10.1021/acs.nanolett.2c00240

Cited by 24 publications

(7 citation statements)

References 61 publications

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“…[ 21 , 53 , 54 ] In turn, current peaks created when contacting a material for the first time have also been reported and seem to be due to the contribution of flexoelectricity. [ 32 , 55 ] Mechanical deformations caused by the contact or rubbing motion can lead to flexoelectric coupling [ 56 , 57 ] that is reflected by the first current peak when contacting slot 1 (or slot 4 in the reversed direction movement).…”

Section: Resultsmentioning

confidence: 99%

A Triboelectric Nanocomposite for Sterile Sensing, Energy Harvesting, and Haptic Diagnostics in Interventional Procedures from Surgical Gloves

Fernandez

Jaufuraully

Bagchi

et al. 2023

Adv Healthcare Materials

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Advanced interfacial engineering has the potential to enable the successful realization of three features that are particularly important for a variety of healthcare applications: wettability control, antimicrobial activity to reduce infection risks, and sensing of physiological parameters. Here, a sprayable multifunctional triboelectric coating is exploited as a nontoxic, ultrathin tactile sensor that can be integrated directly on the fingertips of surgical gloves. The coating is based on a polymer blend mixed with zinc oxide (ZnO) nanoparticles, which enables antifouling and antibacterial properties. Additionally, the nanocomposite is superhydrophobic (self‐cleaning) and is not cytotoxic. The coating is also triboelectric and can be applied directly onto surgical gloves with printed electrodes. The sensorized gloves so obtained enable mechanical energy harvesting, force sensing, and detection of materials stiffness changes directly from fingertip, which may complement proprioceptive feedback for clinicians. Just as importantly, the sensors also work with a second glove on top offering better reassurance regarding sterility in interventional procedures. As a case study of clinical use for stiffness detection, the sensors demonstrate successful detection of pig anal sphincter injury ex vivo. This may lead to improving the accuracy of diagnosing obstetric anal sphincter injury, resulting in prompt repair, fewer complications, and improved quality of life.

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Section: Resultsmentioning

confidence: 99%

A Triboelectric Nanocomposite for Sterile Sensing, Energy Harvesting, and Haptic Diagnostics in Interventional Procedures from Surgical Gloves

Fernandez

Jaufuraully

Bagchi

et al. 2023

Adv Healthcare Materials

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“…The triboelectric effect is a scientific phenomenon in which two different materials become electrically charged after coming in contact with each other. − Although the triboelectric effect has been known for a long time, − it has only been recently applied to harvesting ambient low-frequency mechanical energy (<5 Hz) through triboelectric nanogenerators (TENGs) to power small wearable electronics. − Despite these opportunities, the development of wearable TENGs is facing challenges; e.g., the output performance needs to be enhanced for real-world applications; the robustness at different humidity and temperature needs to be improved; and the longevity of the device needs to be extended. − One of the reasons it is difficult to overcome these obstacles is that the charge generation process of triboelectric effect is relatively complex and the mechanism behind it is still in debate, i.e., whether the electrical output is due to electron transfer, , ion transfer, , or material transfer. − Thus, the triboelectric polarity of different materials, based on which the “triboelectric series” is developed, is acquired purely from empirical results. It is observed from published triboelectric series that the triboelectric polarity is in some way related to the chemical composition of the material .…”

Section: Introductionmentioning

confidence: 99%

Role of Mechanical Properties in the Triboelectric Behavior of Polymers for Wearable Triboelectric Nanogenerators

Zhao,

Ounaies

2024

ACS Appl. Electron. Mater.

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Wearable triboelectric nanogenerators need to meet both the triboelectric output and flexibility requirements of wearable devices, which narrow down the material choices. The complexity in the selection of candidate materials is linked to the interdependence between mechanical properties and triboelectric behavior, made even more evident when two chemically identical and mechanically dissimilar materials result in significant triboelectric output when contacted. In order to comprehensively understand the role of mechanical properties in the triboelectric behavior of chemically identical materials, we designed an experimental framework to examine the effect of mechanical properties on the triboelectric output of polymers using polydimethylsiloxane (PDMS) as a model material. By maintaining the chemical composition and microscale surface roughness of the PDMS samples constant while varying the base-to-curing agent mixing ratio and thermal history, this study isolated the effects of mechanical properties. It is found that the mechanical behavior of the triboelectric material affects both the triboelectric charges generated at the contact surface and the charges accumulated at the interface between the material and the electrode, which results in deep richness and complexity to the material space selection and the triboelectric nanogenerator device design. This study sheds light on the role of mechanical properties in the triboelectric behavior of polymers and contributes to material selection and the development of wearable triboelectric nanogenerators.

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“…Theoretical work has been mainly employed to interpret experimental results, with some success. Especially the recent thermoelectric [27] and flexoelectric models [28,29] have grasped some fundamental features, explaining how deformation and thermal effects can influence the triboelectric output. Thus far, however, models have yet to achieve the predictive capabilities needed to provide innovative design strategies for scalable engineering solutions.…”

Section: Introductionmentioning

confidence: 99%

Rational Design Strategy for Triboelectric Nanogenerators Based on Electron Back Flow and Ionic Defects: The Case of Polytetrafluoroethylene

Fatti,

Ciniero,

et al. 2023

Adv Elect Materials

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The lack of theoretical understanding of triboelectrification has hindered the development of energy harvesting technologies like triboelectric nanogenerators. Focusing on polytetrafluoroethylene, a material with a strong triboelectric output, a model predictive of its triboelectric behavior, driving the development of improved nanogenerators are formulated. With a combined computational‐experimental approach it is shown that defluorination enhances polytetrafluoroethylene nanoscale triboelectric charging. Then a model, explaining the macroscale triboelectric output as determined by the competition of two mechanisms is developed. Defluorination enhances charging while also reducing the interface gap, favoring the backflow of electrons, and possibly reducing charging. However, numerical analysis shows that backflow is negligible, aligning with the prediction of increased triboelectric output. By building triboelectric nanogenerators with defluorinated polytetrafluoroethylene samples, achieved by X‐ray irradiation, a one‐order‐of‐magnitude output increase is demonstrated. The predictive models, supported by experiments, lead to an improved strategy for designing effective energy harvesting devices and new applicative breakthroughs.

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When Flexoelectricity Drives Triboelectricity

Cited by 24 publications

References 61 publications

A Triboelectric Nanocomposite for Sterile Sensing, Energy Harvesting, and Haptic Diagnostics in Interventional Procedures from Surgical Gloves

A Triboelectric Nanocomposite for Sterile Sensing, Energy Harvesting, and Haptic Diagnostics in Interventional Procedures from Surgical Gloves

Role of Mechanical Properties in the Triboelectric Behavior of Polymers for Wearable Triboelectric Nanogenerators

Rational Design Strategy for Triboelectric Nanogenerators Based on Electron Back Flow and Ionic Defects: The Case of Polytetrafluoroethylene

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