Thermodynamic approach to tailor porosity in piezoelectric polymer fibers for application in nanogenerators

Abolhasani, Mohammad Mahdi; Naebe, Minoo; Shirvanimoghaddam, Kamyar; Fashandi, Hossein; Khayyam, Hamid; Joordens, Matthew; Pipertzis, Achilleas; Anwar, Saleem; Berger, Rüdiger; Floudas, George; Michels, Jasper J.; Asadi, Kamal

doi:10.1016/j.nanoen.2019.05.044

Cited by 48 publications

(59 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…5(C,D)). This observation is in agreement with recent literature 42,43 . At polymer concentrations ≤15 wt%, a larger volume fraction of solvent has to evaporate first before the fiber can solidify which in turn increases the drying time.…”

Section: Resultssupporting

confidence: 94%

“…The production of porous or micro-/nanofibers is of high interest for reducing their weight and increasing their surface to volume ratio. For example, such porous or grooved fibers can be obtained by electrospinning and controlling the polymer/solvent/anti-solvent interaction 42,43 . The underlying mechanism of such processes relies on the formation of pores upon the evaporation from the polymer-poor phase and solidification of the polymer-rich phase, which is also reflected by the phase diagrams of such ternary phases 42,43 .…”

Section: Resultsmentioning

confidence: 99%

“…For example, such porous or grooved fibers can be obtained by electrospinning and controlling the polymer/solvent/anti-solvent interaction 42,43 . The underlying mechanism of such processes relies on the formation of pores upon the evaporation from the polymer-poor phase and solidification of the polymer-rich phase, which is also reflected by the phase diagrams of such ternary phases 42,43 . To investigate the inner structure of the here-produced fibers, focused ion beam (FIB) 44 cuts were performed and revealed that the polymer concentration has indeed an impact on the fibers’ internal porosity.…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Solution blow spinning of polymer/nanocomposite micro-/nanofibers with tunable diameters and morphologies using a gas dynamic virtual nozzle

Vasireddi¹,

Kruse

Vakili³

et al. 2019

Sci Rep

View full text Add to dashboard Cite

Uniform endless fibers are ubiquitous and their applications range from functional textiles over biomedical engineering to high-performance filtering and drug delivery systems. Here, we report a new method for the direct, reproducible fabrication of uniform polymer and composite micro-/nanofibers using a microfluidic gas flow focusing nozzle (Gas Dynamic Virtual Nozzle (GDVN)) relinquishing the need for external fiber pulling mechanisms. Compared to other methods, this technique is inexpensive, user-friendly and permits precise fiber diameter control (~250 nm to ~15 µm), high production rate (m/s-range) and direct fiber deposition without clogging due to stable, gas-focused jetting. Control over shape (flat or round) and surface patterning are achieved by simply tuning the air pressure and polymer concentration. The main thinning process happens after the polymer exits the device and is, therefore, mostly independent of the nozzle’s internal geometry. Nevertheless, the lithography-based device design is versatile, allowing for precise flow-field control for operation stability as well as particle alignment control. As an example, we demonstrate the successful production of endless hematite nanocomposite fibers which highlights this technology’s exciting possibilities that can lead to the fabrication of multifunctional/stimuli-responsive fibers with thermal and electrical conductivity, magnetic properties and enhanced mechanical stability.

show abstract

Section: Resultssupporting

confidence: 94%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Solution blow spinning of polymer/nanocomposite micro-/nanofibers with tunable diameters and morphologies using a gas dynamic virtual nozzle

Vasireddi¹,

Kruse

Vakili³

et al. 2019

Sci Rep

View full text Add to dashboard Cite

show abstract

“…It has been shown that energy harvesters based on porous P(VDF‐TrFE) films as well as nanofibers, with pores that are confined inside the polymer, show enhanced power output of the generator. [ 36 ] In the next step of FEM simulations we therefore introduced spherical air cavities inside the δʹ ‐phase nanofiber. The peak voltage is calculated for a fixed pressure of 250 kPa for stress‐charge mode.…”

Section: Resultsmentioning

confidence: 99%

“…The enhancement of the peak voltage is due to lowering of the relative permittivity and the enhancing deformability of the nanofibers upon increasing the amounts of pores. For a porous dielectric film consisting of spherical closed pores, the relative permittivity, ε′, decreases monotonically with the fractional porosity, P , as [ 36,37 ]

ε^{'} = ε (1 - \frac{3 P false(ε - 1 false)}{P ε + 1 - P + 2 ε})

, where, ε = 4 [ 22 ] is the relative dielectric permittivity of nylon‐11. For the ideal case of uniformly distributed isolated spherical pores, the dielectric permittivity continuously drops as porosity increases to 2.67 for a fiber that is 37.5% porous.…”

Section: Resultsmentioning

confidence: 99%

Piezoelectric Nylon‐11 Fibers for Electronic Textiles, Energy Harvesting and Sensing

Anwar

Amiri

Jiang

et al. 2020

Adv Funct Materials

Self Cite

View full text Add to dashboard Cite

Electronic textiles and functional fabrics are among the key constituents envisioned for wearable electronics applications. For e‐textiles, the challenge is to process materials of desired electronic properties such as piezoelectricity into fibers to be integrated as wefts or wraps in the fabrics. Nylons, first introduced in the 1940s for stockings, are among the most widely used synthetic fibers in textiles. However, realization of nylon‐based e‐textiles has remained elusive due to the difficulty of achieving the piezoelectric phase in the nylon fibers. Here, piezoelectric nylon‐11 fibers are demonstrated and it is shown that the resulting fibers are viable for applications in energy harvesting from low frequency mechanical vibrations and in motion sensors. A simulation study is presented that elucidates on the sensitivity of the nylon‐11 fibers toward external mechanical stimuli. Moreover, a strategy is proposed and validated to significantly boost the electrical performance of the fibers. Since a large fraction of the textile industry is based on nylon fibers, the demonstration of piezoelectric nylon fibers will be a major step toward realization of electronic textiles for applications in apparels, health monitoring, sportswear, and portable energy generation.

show abstract

3D Printed Piezoelectric‐Regulable Cells with Customized Electromechanical Response Distribution for Intelligent Sensing

Liu

et al. 2022

Adv Funct Materials

View full text Add to dashboard Cite

Piezoelectric energy harvesters (PEHs) have attracted great attention owing to the capability of converting various forms of mechanical energy into electricity. Traditional approaches for improving piezoelectric conversion efficiency usually involve either complicated composite preparation or significant compromise in the device's mechanical strength and measure, which obviously cannot fulfill the stringent requirements for power supplies within miniaturized footprint and on mechanical compliance of modern electronics. Herein, an innovative strategy coupling 3D printing with a rational structural design is proposed to address the substantial difficulty to architect 3D PEHs featuring boosting piezoelectric performance without alteration either in material (high β-phase content (97.4%) self-poled poly(vinylidene fluoride) (PVDF) used in this case) or in device measure. The 3D-printed piezoelectric latticed cells tailoring in density distribution geometries not only demonstrate the appealing advantages of fast response time, high sensitivity, and excellent linearity within a wide pressure range outperforming many 2D film sensors, but are more sensitive to structure variation for easier regulation of piezoelectric output saving the hassle of changing material, which is beyond the practicability to the traditional 2D sensors. 3D printing highlights a powerful tool in modeling and manipulating complex 3D piezoelectric-regulable energy harvesters for intelligent sensing applications otherwise inaccessible to traditional techniques.

show abstract

Thermodynamic approach to tailor porosity in piezoelectric polymer fibers for application in nanogenerators

Cited by 48 publications

References 42 publications

Solution blow spinning of polymer/nanocomposite micro-/nanofibers with tunable diameters and morphologies using a gas dynamic virtual nozzle

Solution blow spinning of polymer/nanocomposite micro-/nanofibers with tunable diameters and morphologies using a gas dynamic virtual nozzle

Piezoelectric Nylon‐11 Fibers for Electronic Textiles, Energy Harvesting and Sensing

3D Printed Piezoelectric‐Regulable Cells with Customized Electromechanical Response Distribution for Intelligent Sensing

Contact Info

Product

Resources

About