Performance Assessment of a Piezoelectric Vibration Energy Harvester for Hybrid Excitation with Varying Cross Sections DOI Creative Commons
Bartłomiej Ambrożkiewicz, Zbigniew Czyż, Vikram Pakrashi

et al.

Sensors, Journal Year: 2024, Volume and Issue: 24(23), P. 7629 - 7629

Published: Nov. 28, 2024

This paper experimentally examines the influence of hybrid excitation on performance vibrational piezoelectric energy harvesting systems a bluff body with variable cross section along its generatrix. A combination from shaker and airflow is considered source which harvested. Varied frequencies velocities across five different masses were considered, each defining natural frequency system. The system's in excitation, enhancements harvesting, challenges these was observed, helping to determine optimal operating conditions function effectively ambient environments. tests identified ranges within maximized responses observed. Next, computational fluid dynamic (CFD) simulations carried out understand impact circular square sections controlling nature representative wide range that may be utilized for such purposes. analyses helped contextualize opportunities limitations use understanding if transition one another can lead an assimilation advantages observed using independently.

Language: Английский

Formation and saturation of β-phase of PVDF in DMF solvent: a comprehensive study DOI

Satyasadhan Dowarah,

Parswajit Kalita, Divya Pratap Singh

et al.

Soft Materials, Journal Year: 2025, Volume and Issue: unknown, P. 1 - 11

Published: Jan. 6, 2025

In the present work, we report effect of solvent content on β-phase fraction in PVDF (poly(vinylidene fluoride)) films synthesized by facile wet chemical route using DMF (N,N-Dimethylformamide) as solvent. The amount powder was kept fixed while varied. X-ray diffraction (XRD) revealed transformation α-phase to films, which further confirmed Fourier Transform Infrared Spectroscopy (FTIR). Deconvolution XRD profiles showed increase (viz. βα ratio) with initial volume. However, a surprising and previously unreported result emerged, i.e. saturation beyond certain volume plausible mechanism for formation is discussed.

Language: Английский

Citations

1
Recent Progress in Energy Harvesting Technologies for Self‐Powered Wearable Devices: The Significance of Polymers DOI

Hana Afshar,

Farimah Kamran,

Farangis Shahi

et al.

Polymers for Advanced Technologies, Journal Year: 2025, Volume and Issue: 36(4)

Published: April 1, 2025

ABSTRACT The growing demand for self‐powered wearable electronic devices in healthcare, fitness, and entertainment has driven significant advancements energy harvesting technologies. This review explores the latest progress mechanisms that enable sustainable autonomous devices, with a particular emphasis on role of polymers their development. Polymers offer unique combination mechanical flexibility, biocompatibility, lightweight properties, making them ideal applications. systematically categorizes major technologies into three primary mechanisms: thermoelectric generators (TEGs), piezoelectric harvesters (PEHs), triboelectric nanogenerators (TENGs). Each section provides an in‐depth discussion working principles, material innovations, fabrication techniques, applications these systems. Beyond fundamental mechanisms, discusses hybrid systems integrate multiple sources to maximize power generation ensure continuous device operation. storage technologies, such as flexible supercapacitors micro‐batteries, is also highlighted address intermittency challenges ambient sources. Despite progress, remain improving conversion efficiency, enhancing durability, optimizing system integration real‐world identifies key research directions overcoming challenges, including advanced materials engineering, miniaturization artificial intelligence‐driven management strategies. findings presented this provide valuable insights development next‐generation paving way efficient electronics seamlessly daily life.

Language: Английский

Citations

0
Crystallization behavior and electrical conductivity of fluorosilane-modified multi-walled carbon nanotubes/polymethyl methacrylate/polyvinylidene fluoride ternary composite DOI Creative Commons
Bo Lin,

Jian‐Wu Xiao,

Jingmin Li

et al.

Journal of Thermal Analysis and Calorimetry, Journal Year: 2025, Volume and Issue: unknown

Published: May 2, 2025

Abstract In order to increase the compatibility with polyvinylidene fluoride (PVDF), multi-walled carbon nanotubes (MWCNTs) were modified by trimethoxy (1H, 1H, 2H, 2H heptadecafluorodecyl) silane obtain fluorosilane-modified MWCNTs (F-MWCNTs). The as-prepared F-MWCNTs characterized scanning electron microscopy (SEM), wide-angle X-ray diffraction (WAXD), thermogravimetric analysis (TGA), and Fourier transform infrared (FTIR) confirm successful surface modification of fluorosilane. further blended polymethyl methacrylate (PMMA) PVDF prepare MWCNTs/PMMA/PVDF ternary composites containing 1%, 3%, 5%, 7%, 10% solution mixing, SEM, WAXD, FTIR, alternating current (AC) electrical conductivity testing. It was confirmed that homogeneously distributed in PMMA/PVDF matrix. Moreover, existence contributed improvement crystallization degree ( X c ) β crystalline content [ F )] as well AC σ for composites. values , ), at 100 Hz MWCNTs(10%)/PMMA/PVDF composite 47.4%, 56.5%, 2.40 × 10 –1 Sm −1 respectively, while corresponding pure only 42.2%, 27.8%, 1.85 –9 respectively. enhanced performances comparison those can be attributed interface interactions among F-MWCNTs, PVDF, PMMA phase separation PVDF.

Language: Английский

Citations

0
Research on the rigid preparation method of flexible micro coils for flexible self powered electrical devices using laser cutting technology DOI

Wencheng Li,

Huifang Liu, Yufei Lu

et al.

Optics & Laser Technology, Journal Year: 2025, Volume and Issue: 188, P. 112991 - 112991

Published: April 18, 2025

Language: Английский

Citations

0
High-Efficiency Nanostructured Materials for Flexible and Wearable Energy Harvesting Technologies DOI Creative Commons
Chandan Adhikari

EPJ Web of Conferences, Journal Year: 2025, Volume and Issue: 325, P. 01002 - 01002

Published: Jan. 1, 2025

The growing demand for portable, sustainable power sources has driven significant advancements in flexible and wearable energy harvesting technologies. These technologies leverage ambient mechanical, thermal, vibrational to small electronic devices, offering a promising solution self-sustaining, on-the-go systems. integration of nanostructured materials into devices emerged as key strategy enhance efficiency, flexibility, performance. This paper explores the role high-efficiency development It examines various mechanisms, including piezoelectric, triboelectric, thermoelectric, their compatibility with nanomaterials. unique properties materials—such increased surface area, enhanced electrical performance—are discussed context optimizing conversion efficiency. also reviews design principles integrating these highlighting recent innovations case studies field. Applications harvesters electronics, self-powered medical environmental monitoring are presented, along challenges scaling, durability, sustainability. Finally, future perspectives on commercialization provided, emphasizing need improved material fabrication, cost-effectiveness, long-term reliability. offers comprehensive overview how revolutionizing harvesting, paving way more efficient, sustainable, portable solutions.

Language: Английский

Citations

0
Performance Assessment of a Piezoelectric Vibration Energy Harvester for Hybrid Excitation with Varying Cross Sections DOI Creative Commons
Bartłomiej Ambrożkiewicz, Zbigniew Czyż, Vikram Pakrashi

et al.

Sensors, Journal Year: 2024, Volume and Issue: 24(23), P. 7629 - 7629

Published: Nov. 28, 2024

This paper experimentally examines the influence of hybrid excitation on performance vibrational piezoelectric energy harvesting systems a bluff body with variable cross section along its generatrix. A combination from shaker and airflow is considered source which harvested. Varied frequencies velocities across five different masses were considered, each defining natural frequency system. The system's in excitation, enhancements harvesting, challenges these was observed, helping to determine optimal operating conditions function effectively ambient environments. tests identified ranges within maximized responses observed. Next, computational fluid dynamic (CFD) simulations carried out understand impact circular square sections controlling nature representative wide range that may be utilized for such purposes. analyses helped contextualize opportunities limitations use understanding if transition one another can lead an assimilation advantages observed using independently.

Language: Английский

Citations

0