A universal but simple procedure for identifying the α, β and γ phases in PVDF using FTIR is proposed validated. An integrated quantification methodology individual phase mixed systems also proposed.

Nonsolvent-induced phase separation (NIPS) is a facile and cost-effective technique for the efficient fabrication of multifunctional polyvinylidene fluoride (PVDF) membranes. However, polymorphic transition PVDF during this process not well understood, although different interpretations have been proposed. Here, polymorphism solution-cast films corresponding NIPS membranes has investigated. Results show that use polar aprotic solvents normally unable to induce α → β transformation in cast...

Effective transformation from paraelectric to a high fraction of ferroelectric phase is crucial produce piezoelectric materials with constant for broad applications. In polyvinylidene fluoride (PVDF) thin films, both mechanical stretching and electric poling processes have been found be critical in the α → β transformation. However, PVDF fibers fabricated by electrospinning process, roles not well explored. Here, properties forcespinning, spinning process without poling, characterized...

Oxidative stress and inflammation are well-documented pathological factors in alcoholic liver disease (ALD). Artichoke (Cynara scolymus L.) is a healthy food folk medicine with anti-oxidative anti-inflammatory properties. This study aimed to evaluate the preventive effects of ethanolic extract from artichoke against acute alcohol-induced injury mice. Male Institute Cancer Research mice were treated an (0.4, 0.8, 1.6 g/kg body weight) by gavage once daily. Up 40% alcohol (12 mL/kg was...

Abstract This work studied interfacial lubrication and friction of piezoelectric materials. Two types anionic cationic surfactant water-based solutions were configured to perform variable rotational speed load in experiments. study revealed that, the lubricant molecules produce adsorption effects on corresponding electrode solid-liquid interface, generating specific behaviors. The positive surface adsorbs anions negative cations form a thicker film effectively reduce compared with at...

Circularly shaped polymeric droplets with diameter of about 20 μm have been intermittently ejected and deposited in an orderly manner on a collector from syringe needle by means near-field, electrohydrodynamic reactions using pulsating voltages at around 2.25 kV. The has inner 100 was placed 1 mm above silicon conductor substrate to location control for droplet depositions. Under low-frequency operation less than Hz, the deposition frequency droplets, fdep, observed be equal applied driving...

The modified near-field electrospinning (NFES) and the conventional NFES have been compared to demonstrate viability of direct-writing micro/nano structures from PVDF solution systems. shows good capability in writing various orderly patterns, such as straight continuous lines, parallel arc beads-on-string structures, whereas is difficult give a process. Besides, also allows lower electric field due jet initiated mechanical way. By finely tuning key parameters during process, property, speed...

Gap electrospinning is a facile technique to produce aligned nanofibers useful for many applications, but its potential has not yet been fully exploited in nature, leading the fiber length still limited several tens of centimeters at present. In this work, we report breakthrough production well-aligned with record and efficiency. Using suitable poly(vinylidene fluoride) solution pair parallel plates that are substrate-free negatively connected, demonstrate ease prepare length-controllable...

Laser-induced-plasma-assisted ablation (LIPAA) is a promising micro-machining method that can fabricate microstructure on hard and transparent double-polished single crystal sapphire (SCS). While ablating, nanosecond pulse 1064 nm wavelength laser beam travels through the SCS substrate bombards copper target lined up behind substrate, which excites ablating plasma. When fluence rises above machining threshold of but below SCS, kinetic energy plasma generated from bombardment mainly...

Electrospinning has been widely used in fabricating nanofibers and nanofibrous membranes. Recently, the fabrication of three-dimensional (3D) macrostructures become a hot subject development electrospinning technology. In this paper, 3D macrostructure was constructed by using apparatus with both dynamic static collecting templates. The effect governing parameters on formation process is studied, such as applied voltage, flow rate, needle-tip-to-collector distance, rotating speed. It found...

A facile and effective transformation of α to β phase in electrospinning PVDF was demonstrated by adding emeraldine base polyaniline (PANI). Results from FTIR X-ray studies revealed that a very large amount the electraoctive β-phase can be obtained controlling PANI loading parameters, whereas γ-phase normally showed tiny amount, much lower than β-phase, for all samples with loading. The above results indicate addition into solution during is powerful way enhance electroactive fibers, which...

Although electrospinning of polyvinylidene fluoride (PVDF) has been studied for more than 10 years, the crystalline phase differentiation electrospun mats is still normally through combination different characterization techniques, and relationship between polymorphism morphology fibers in PVDF membranes never reported. Here, we show their close relationships by conducting room-temperature experiments on various polymer/solvent systems. The full bead-free have a very high fraction β-phase,...

Considerable attention has been paid to aligned polymer nanofibers because of their appealing mechanical and piezoelectric properties. With modified electrospinning, the poly (vinylidene fluoride) (PVDF) can be produced. However, roles stretching electrical poling during this process require further investigation. Here, we utilize a rotary drum collect fibers by both electrospinning drawing approaches. The fiber mats were characterized Scanning Electron Microscope (SEM), Fourier Transform...

A facile technique to transform candle soots into nanoporous fibers via electrospinning of mixed solution and polyvinylidene fluoride (PVDF) has been demonstrated for the first time. Due insolubility soot nanoparticles good solubility PVDF polymer in DMF/acetone solvents, molecules are heterogeneously dispersed solutions. The selection an appropriate concentration resulted a dispersion low-density which can be held electrospinning. experiment shows that smoothly bonded with form fibers....

The interest in candle soot (CS)-based superhydrophobic coatings has grown rapidly recent years. Here, a simple and low-cost process been developed for the fabrication of CS-based through electrospraying composite cocktail solution CS polyvinylidene fluoride (PVDF). Results show that superhydrophobicity coating closely relates to loading amount which results with different roughnesses. Specifically, increasing (not more than 0.4 g) normally enhances due higher roughness being presented...

Aligned electrospun nanofibers have gained increasing interest due to unique electrical, optical, and mechanical properties. Several works devoted reshaping the electrospinning process through modifying collector structures. However, more investigations are still required. Here, influence of structures some key parameters on fiber alignment by using static parallel substrates as reported. Results show that two favorable obtain governing for making also determined. The suitable solution...

The influence of the composition a binary component solvent on surface morphology and diameter distribution poly(vinylidene fluoride)/ethyl cellulose (PVDF/EC) fibres produced by electrospinning technology was investigated. Acetone (56°C) N-methyl pyrrolidone (NMP) (203°C) system introduced performed changing solution concentration, applied voltage volume ratio NMP/acetone. results show that PVDF/EC electrospun is greatly influenced concentration prepared from NMP/acetone much better than...

A highly hydrophobic metal mesh has great potential for its application in oil/water separation due to special wettability. However, most current devices are simple with limited capacity. device based on a was constructed different types of mixtures. Experimental results show that the not only can be used continuous binary mixtures any density ratios but also realize simultaneous heavy oil/water/light oil ternary This achievement is meaningful practical applications, which will gain interest future.

A modified electrospinning setup with parallel electrode and heater plate was presented to fabricate piezoelectric nanofibrous membrane directly. Thanks the strong electric field strength, high stretch ratio environmental temperature during process, α-phase poly (vinylidene fluoride) (PVDF) would be transformed β-phase well have excellent performance. The maximal output voltage increased from 100 mV 300 increasing excitation frequency 5 Hz 1000 Hz, noise in response decreased frequency. This...