Abstract
P(VDF-TrFE) (vinylidene fluoride-co-trifluoroethylene)/PMMA (PVT/PMMA) blended films synthesized through a facile solution-blending method show outstanding performance for practical electrowetting and energy storage applications. The van der Waals forces and dipolar interactions in neighboring P(VDF-TrFE) and PMMA chains, together with the suppressed free volume (or defect) are critical to the significantly-enhanced electrical properties. Typical, Teflon-covered P(VDF-TrFE)/PMMA blended film exhibits a high dielectric constant of 13 with low dielectric loss (~0.05) at 100 Hz and a large initial contact angle of 122°. Its electrowetting response with a contact angle modulation of 50° in air and low contact angle hysteresis demonstrate that it is promising for low-voltage electrowetting applications. Furthermore, with an energy density of 11.8 J/cm3, approximately double that of pure P(VDF-TrFE), PVT/PMMA blended films containing 20 wt % PMMA turn out to be superior materials for energy storage applications, due to their significantly-enhanced polarization and reduced remnant polarization.
Highlights
EWOD [1] is a versatile technique based on an apparent contact angle modulation controlled by the applied electric field, which has gained attention in micro-scale systems [2,3], including liquid lenses [4,5], optical waveguides [6], lab-on-a-chip devices [7,8], electronic displays [9,10,11], digital microfluidics [12], etc
In order to electrowetting cut down thephenomenon power consumption, it requires a high dielectric equation shows that the ideal should be realized under minimum constant (ε), low energy
The morphology of the surface and the cross-sections of the films freeze-fractured in liquid nitrogen before testing were observed using a field emission scanning electron microscopy (FESEM, S-4800, Hitachi Ltd, Tokyo, Japan) and atomic force microscopy (AFM, MultiMode, VEECO Co., Billerica, Massachusetts, USA)
Summary
EWOD [1] (electrowetting-on-dielectric) is a versatile technique based on an apparent contact angle modulation controlled by the applied electric field, which has gained attention in micro-scale systems [2,3], including liquid lenses [4,5], optical waveguides [6], lab-on-a-chip devices [7,8], electronic displays [9,10,11], digital microfluidics [12], etc. Polymers 2018, 10, x FOR PEER REVIEW that the ideal electrowetting phenomenon should be realized under minimum voltage with the maximum dielectric layer, d is the dielectric thickness, and γ is the liquid-vapor interfacial energy Generally realized in anis oil known to adversely prevent the droplet from rapid and accurate response to the applied voltage during ambient condition, small dielectric thickness (d), and large initial contact angle The introduction of inorganic fillers with a high dielectric constant is regarded as the most effective method to improve the energy storage density of PVDF-based polymer and copolymers further [26,27,28,33,34]. A significantly promising blended film with outstanding performance for practical electrowetting and high energy-density applications has been successfully synthesized through a facile solution-based method
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