Coupling effect of impact and in-layer voltage on flexoelectricity of PDMS laminated structures

Chang, Mengzhou; Li, Ke; Liu, Chang; Leng, Bingyu; Guo, Kai; Chen, Chuang; Han, Yafei; Liu, He; Tang, Enling

doi:10.1016/j.polymertesting.2022.107741

Cited by 3 publications

(2 citation statements)

References 28 publications

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“…When the microcapsules are added in 25, 50, 75, and 100 mg, the electret charge output signal peaks are 12 pC ( ΔQ 1 ), 27 pC ( ΔQ 2 ), 38 pC ( ΔQ 3 ), and 52 pC ( ΔQ 4 ), respectively. Compared with the existing new electret, the output charge is significantly improved. , When the microcapsules are incorporated into PDMS, the output charge signal has a significant increase, and it increases with the dosage. Thus, as shown in Figure b, we investigate the relationship between the normalized output charge and dosage.…”

Section: Resultsmentioning

confidence: 99%

“…Compared with the existing new electret, the output charge is significantly improved. 23,34 When the microcapsules are incorporated into PDMS, the output charge signal has a significant increase, and it increases with the dosage. Thus, as shown in Figure 9b, we investigate the relationship between the normalized output charge and dosage.…”

Section: Flexoelectric-like Response Of Microcapsule Electretsmentioning

confidence: 99%

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Fabrication and Analysis of Microcapsule Electrets with a Tunable Flexoelectric-like Response

Zheng

Wang

Yang

et al. 2023

ACS Appl. Mater. Interfaces

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The electret has drawn considerable attention as an emerging flexible energy collector. In this work, a charged microcapsule is designed which can provide a stable storage space for electric charge in the electret. The flexoelectric-like response is achieved by embedding a layer of charged microcapsules in the middle plane of the flexible polymer to form an electret. The results of Fourier transform infrared spectroscopy and energy-dispersive X-ray spectroscopy verified the successful preparation of microcapsules. Zeta potential analysis showed the negative electrical properties of the microcapsules. The prepared microcapsule electret has a significant flexoelectric effect under loading conditions. This work presents a preliminary theoretical study of the microcapsule electret to optimize the output characteristics of the electret by varying the parameters, including the number of microcapsules, the size of the electret, and the external load. Good agreement was achieved with the experimental results, which verified the validity of the theoretical study. This work provides a new method for preparing electret and further promotes its application in electromechanical transducers.

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Section: Resultsmentioning

confidence: 99%

Section: Flexoelectric-like Response Of Microcapsule Electretsmentioning

confidence: 99%

Fabrication and Analysis of Microcapsule Electrets with a Tunable Flexoelectric-like Response

Zheng

Wang

Yang

et al. 2023

ACS Appl. Mater. Interfaces

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The effect of porosity on flexoelectricity in 3D printed aluminum/polyvinylidene fluoride composites

Hafner,

Örnek,

Collard

et al. 2023

Journal of Applied Physics

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We investigated the relationship between porosity and flexoelectricity for aluminum (Al)/polyvinylidene fluoride (PVDF) composites. Neat PVDF, composites of micron aluminum (μAl)/PVDF, and composites of nano aluminum (nAl)/PVDF were 3D printed, and the flexoelectric response was measured using a cantilever beam test setup. Voids (up to 72.4 mm3) were incorporated into the samples by decreasing the infill percent of the 3D printed material. We found that increasing the porosity via millimeter scale voids incorporated into the infill pattern decreased the average effective flexoelectric coefficient relative to the near full-density (100% infill) control samples. This contrasts with other studies that have shown increasing micron scale porosity increases the flexoelectric coefficient. In addition, we measured higher flexoelectric responses for nAl/PVDF than μAl/PVDF as well as for samples printed by the Hyrel 3D SR printer as opposed to the Ender 3 V2 printer. These results indicate that charge generation due to flexoelectricity can be altered by changing parameters such as porosity, particle size of inclusions, or manufacturing method. Smaller voids and fine particles can induce larger strain gradients than larger inhomogeneities, leading to increased flexoelectric coefficients. A competing effect is that more porosity leads to less materials, which can decrease the flexoelectric coefficient.

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The flexoelectric properties of various polymers and energetic composites

Hafner,

Örnek,

Costello

et al. 2024

Applied Physics Letters

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Electroactivity of polymers used in energetic materials may result in charge separation that could result in safety concerns (unintentional ignition) or be exploited for multifunctional applications. We measured the flexoelectric properties of several polymers and energetic composites including poly(vinylidene fluoride-co-trifluoroethylene) [P(VDF-TrFE)], nanosized aluminum (nAl)/P(VDF-TrFE), poly(vinylidene fluoride-co-hexafluoropropylene) [P(VDF-HFP)], micron aluminum (μAl)/P(VDF-HFP), hydroxyl-terminated polybutadiene (HTPB), ammonium perchlorate (AP)/HTPB, μAl/AP/HTPB, polytetrafluoroethylene (PTFE), and polydimethylsiloxane (PDMS). The presence of flexoelectricity in PTFE (Teflon®) and the relatively high flexoelectric coefficient of P(VDF-HFP) (Viton®) measured in this work may help explain accidents involving the production and use of Magnesium-Teflon-Viton (MTV) that in many instances have been attributed to electro-static discharge. The addition of aluminum nanopowders to the P(VDF-TrFE) increased the flexoelectric coefficient by ∼30%. However, the addition of aluminum micrometer particles (10 wt. %) to P(VDF-HFP) decreased the effective flexoelectric coefficient, while an increase was observed when the aluminum loading was increased from 10 to 20 wt. %. The effective flexoelectric coefficient of HTPB and two propellant compositions (AP/HTPB and μAl/AP/HTPB) were measured to be in the same range as each other. The effect of particle addition (nAl, μAl, and AP) on flexoelectricity was different depending on the binder, further illustrating the complexity of flexoelectric properties in composite energetics. This may be somewhat explained by competing effects where particle additions (nAl, μAl, and AP) create additional strain gradients that contribute to flexoelectricity, but the particle additions also replace the mass of flexoelectric polymer binders (P(VDF-TrFE, P(VDF-HFP), and HTPB) with particles (nAl, μAl, and AP) that are less flexoelectric.

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Coupling effect of impact and in-layer voltage on flexoelectricity of PDMS laminated structures

Cited by 3 publications

References 28 publications

Fabrication and Analysis of Microcapsule Electrets with a Tunable Flexoelectric-like Response

Fabrication and Analysis of Microcapsule Electrets with a Tunable Flexoelectric-like Response

The effect of porosity on flexoelectricity in 3D printed aluminum/polyvinylidene fluoride composites

The flexoelectric properties of various polymers and energetic composites

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