Piezoelectric cellular micro-structured PDMS material for micro-sensors and energy harvesting

Kachroudi, Achraf; Basrour, Skandar; Rufer, Libor; Jomni, F.

doi:10.1088/1742-6596/660/1/012040

Cited by 12 publications

(13 citation statements)

References 6 publications

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“…The elastomeric matrix was obtained from a commercial polydimethylsiloxane (PDMS) base, Sylgard 184 (Dow Corning Sylgard 184 TDS Krayden, 2013), which is a two-component material which is widely used in electronic applications, especially for encapsulation of microelectronics circuits. This material shows very interesting properties as an electret (Kachroudi et al, 2017) and it was already described and studied in Kachroudi et al (2015), where its viscoelastic, thermal and dielectric properties can be found. The aim of this article is to study and discuss its magnetorheological properties when enriched by various weight fractions of ferromagnetic particles.…”

Section: Experimental Apparatusmentioning

confidence: 99%

Magneto-mechanical characterization of magnetorheological elastomers

Bellelli

Spaggiari

2019

Journal of Intelligent Material Systems and Structures

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This work analyses the properties and the magneto-mechanical characteristics of magnetorheological elastomers, a class of smart materials not yet broadly investigated. First, set of several samples of this material was manufactured, each one characterized by a different percentage of ferromagnetic material inside the viscoelastic matrix. The specimens were manufactured in order to create isotropic and anisotropic configurations, respectively, with randomly dispersed ferromagnetic particles or with an aligned distribution, obtained through and external magnetic field. Then, the mechanical behaviour of each sample was analysed by conducting a compression test, both with and without an external magnetic field. Moreover, a three-point bending test was also performed on the same specimens. Stiffness, deformation at maximum stress and specific energy dissipated were calculated based on the experimental data. The results were analysed considering the mechanical responses, and an analysis of variance was carried out in order to assess the statistical influence of each variable. The experimental results highlighted a strong correlation between the percentage of ferromagnetic material in each sample and its mechanical behaviour. The anisotropicity of the material, aligned in columnar structures, also affects the stiffness measured in the compression test, while the external magnetic field’s main contribution is to reduce the samples’ maximum deformation. Using analysis of variance results as guidelines, we built a simple phenomenological model which produces quite reliable predictions regarding the mechanical response of the magnetorheological elastomers under compressive stress.

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Section: Experimental Apparatusmentioning

confidence: 99%

Magneto-mechanical characterization of magnetorheological elastomers

Bellelli

Spaggiari

2019

Journal of Intelligent Material Systems and Structures

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“…The elastomeric matrix was obtained from a commercial PDMS (Polydimethylsiloxane) base, Sylgard 184, by Dow Corning, which is a two-component material which is widely used in electronic applications, especially for encapsulation of microelectronics circuits. This material shows very interesting properties as an electret and it was already described and studied in (Kachroudi et al, 2015), where its viscoelastic, thermal and dielectric properties can be found. The aim of this paper is to study and discuss its magnetorheological properties when enriched by various weight fractions of ferromagnetic particles.…”

Section: Experimental Apparatusmentioning

confidence: 99%

Magnetorheological elastomers characterization under shear loading up to failure: A magneto-mechanical multivariate analysis

Spaggiari

Bellelli

2020

Journal of Intelligent Material Systems and Structures

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This work analyses the shear behavior of magnetorheological elastomers (MRE), a class of smart materials which presents interesting magneto-mechanical properties. In order to determine the effect of several variables at a time, a design of experiment approach is adopted. A set of several samples of MRE was manufactured, by varying the weight fraction of ferromagnetic material inside the viscoelastic matrix and the isotropicity of the material, by adding an external magnetic field while the elastomeric matrix was still liquid. The mechanical behavior of each sample was analyzed by conducting cyclic tests at several shear rates, both with and without an external magnetic field. Moreover, in order to estimate the maximum shear stress, the specimens were loaded monotonically up to failure. Shear stiffness, maximum shear stress and specific dissipated energy were calculated on the basis of the experimental data. The results were analyzed using an Analysis of Variance (ANOVA) to assess the statistical influence of each variable. The experimental results highlighted a strong correlation between the weight fraction of ferromagnetic material in each sample and its mechanical behavior. Moreover, the dissipated energy of the MRE drops down when the magnetic field stiffens the behavior or the shear rate increases. The ultimate failure shear stress is strongly affected by the external magnetic field, increasing it by nearly 50%. The ANOVA on the results provides a simple phenomenological model is built for each output variable and it is compared with the experimental tests. These models produce a fast and fairly accurate prediction of each analyzed response of the MRE under various shear rates and applied magnetic fields.

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“…A PET/EVA film with an arch-shaped air bubble with a height of 0.5-1 mm was achieved after hot pressing [33]. In addition, Kachroudi et al [58] fabricated a microstructured layer of 40 µm thickness, containing cylindrical micro-cavities of 100 µm diameter and a pitch of 150 µm, shown in Fig. 10(F).…”

Section: Typical Microstructure Of Ferroelectrets Used For Energy Harvestingmentioning

confidence: 99%

Ferroelectret materials and devices for energy harvesting applications

Bowen¹

2019

Preprint

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This paper provides an overview of ferroelectret materials for energy harvesting applications. These materials take the form of a cellular compliant polymer with polarised pores that provide a piezoelectric response to generate electrical energy as a result of an applied strain or surrounding vibration. The manufacturing processes used to create ferroelectret polymer structures for energy harvesting are discussed, along with the range of microstructural features and pore sizes that are formed. Their important mechanical, electrical and harvesting performance are then described and compared. Modelling approaches for microstructural design or for predicting the vibrational and frequency dependent response are examined. Finally, conclusions and future perspectives for ferroelectret materials for energy harvesting applications are provided.

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Piezoelectric cellular micro-structured PDMS material for micro-sensors and energy harvesting

Cited by 12 publications

References 6 publications

Magneto-mechanical characterization of magnetorheological elastomers

Magneto-mechanical characterization of magnetorheological elastomers

Magnetorheological elastomers characterization under shear loading up to failure: A magneto-mechanical multivariate analysis

Ferroelectret materials and devices for energy harvesting applications

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