Light intensity-induced phase transitions in graphene oxide doped polyvinylidene fluoride

Barnakov, Yu. A.; Paul, Omari; Joaquim, Akinwunmi; Falconer, April; Mu, R.; Barnakov, Vadim Y.; Dikin, Dmitriy A.; Petranovskii, Vitalii; Zavalin, Andrey; Ueda, Akira; Williams, Frances

doi:10.1364/ome.8.002579

Cited by 19 publications

(9 citation statements)

References 29 publications

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“…Therefore, Raman spectroscopy was further used to analyze the phases and to perform peak fitting and peak separation. The characteristic peaks of each phase in the Raman spectra of the solution casting and MDO films have been labeled ( Figure 4 b and Table S2 ) [ 40 ]. The peaks in the range of 780–860 cm −1 had a higher intensity and overlap, so they were selected for peak fitting and peak separation ( Figure S2 ).…”

Section: Resultsmentioning

confidence: 99%

Poly(vinylidene fluoride) Intestinal Sleeve Implants for the Treatment of Obesity and Type 2 Diabetes

et al. 2022

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Currently, treatment of diabetes and associated obesity involves Roux-en-Y gastric bypass or sleeve gastrectomy to reduce the absorption of nutrients from the intestine to achieve blood glucose control. However, the surgical procedure and subsequent recovery are physically and psychologically burdensome for patients, with possible side effects, so alternative treatments are being developed. In this study, two methods, solution casting and machine direction orientation (MDO), were used to prepare intestinal implants made of poly(vinylidene fluoride) (PVDF) film and implant them into the duodenum of type 2 diabetic rats for the treatment of obesity and blood glucose control. The PVDF film obtained by the MDO process was characterized by FT-IR, Raman spectroscopy, XRD and piezoelectricity tests, which showed higher composition of β crystalline phase and better elongation and mechanical strength in specific directions. Therefore, the material was finally tested on rats after it was proven to be non-toxic by biological toxicity tests. The PVDF was implanted into alloxan-induced diabetic rats, which were used as a model of impaired insulin secretion due to pancreatic beta cell destruction rather than obesity-induced diabetes, and rats were tracked for 24 days, showing significantly improved body weight and blood glucose levels. As an alternative therapeutic option, intestinal sleeve implant showed future potential for application.

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Section: Resultsmentioning

confidence: 99%

Poly(vinylidene fluoride) Intestinal Sleeve Implants for the Treatment of Obesity and Type 2 Diabetes

et al. 2022

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“…The Bragg planes and phonon-modes detected in the material and corresponding phases are enlisted in tables 2 and 3. Among all, Raman bands at 843 (β) and 795 cm −1 (α) are the most intense & significant ones and their intensities can be used to determine the relative proportion of the corresponding phases [52][53][54]. For pure PVDF (S1), =…”

Section: Resultsmentioning

confidence: 99%

Dielectric and piezoelectric augmentation in self-poled magnetic Fe₃O₄/poly(vinylidene fluoride) composite nanogenerators

Bhattacharjee

Mondal

Banerjee

et al. 2020

Mater. Res. Express

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One major discipline of contemporary research in energy harvesting and conversion aims in developing lead-free, biocompatible, easily scalable, flexible and high power-denisty nanogenerators via utilizing poly(vinylidene fluoride) as an electroactive host-network due to its large breakdown strength, interesting polytype electrical order and thermoplastic nature. In this work, surfacefunctionalized magnetite nanoparticles (MNPs) of two different size having exotic electret and sizedependent magnetic properties are mixed with PVDF gel to fabricate self-poled composite piezoelectric films, which can obstruct electromagnetic interference also for smart device applications. A four-fold enhancement of its polar β-phase is verified from XRD and Raman spectra against incorporation of Fe 3 O 4 . Dielectric analysis suggests higher dielectric constant and lower dissipation for the films with tiny MNPs embedded in PVDF. The observations are duly validated from first principles studies. The physisorption process is recognized via geometrical optimization of Fe 3 O 4 /PVDF composite structure and significant amount of charge-transfer is demonstrated by the Mulliken charge-analysis. Open-circuit voltage and short-circuit current attain enhancement upto an order due to adequate ion-dipole and dipole-dipole interactions between the polar nanoscopic surface of Fe 3 O 4 and PVDF. Finally, the nanogenerators are employed to light up commercial LEDs.

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“…The structural difference between α and β phases is usually attributed to Raman peaks associated with the vibrations of CH 2 -rocking modes at 797 cm −1 for the α phase and 840 cm −1 for the β phase, accompanied by the presence of CF 2 -scissoring modes at 610 cm −1 and 510 cm −1 for α and β crystalline phases, respectively [15].…”

Section: Polymer Phase Contentmentioning

confidence: 99%

Electrospray Deposition of Polyvinylidene Fluoride (PVDF) Microparticles: Impact of Solvents and Flow Rate

et al. 2022

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Polymeric microparticles have been shown to have great impacts in the area of drug delivery, biosensing, and tissue engineering. Electrospray technology, which provides a simple yet effective technique in the creation of microparticles, was utilized in this work. In addition, altering the electrospray experimental parameters such as applied voltage, flow rate, collector distance, solvents, and the polymer-solvent mixtures can result in differences in the size and morphology of the produced microparticles. The effects of the flow rate at (0.15, 0.3, 0.45, 0.6, 0.8, and 1 mL/h) and N, N-Dimethylformamide (DMF)/acetone solvent ratios (20:80, 40:60, 60:40, 80:20, 100:0 v/v) in the production of polyvinylidene fluoride (PVDF) microparticles were studied. Scanning electron microscopy (SEM) was used to observe changes in the morphology of the microparticles, and this revealed that a higher acetone to DMF ratio produces deformed particles, while flow rates at (0.3 and 0.45 mL/h) and a more optimized DMF to acetone solvent ratio (60:40 v/v) produced uniform spherical particles. We discovered from the Raman spectroscopy results that the electrosprayed PVDF microparticles had an increase in piezoelectric β phase compared to the PVDF pellet used in making the microparticles, which in its original form is α phase dominant and non-piezoelectric.

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Light intensity-induced phase transitions in graphene oxide doped polyvinylidene fluoride

Cited by 19 publications

References 29 publications

Poly(vinylidene fluoride) Intestinal Sleeve Implants for the Treatment of Obesity and Type 2 Diabetes

Poly(vinylidene fluoride) Intestinal Sleeve Implants for the Treatment of Obesity and Type 2 Diabetes

Dielectric and piezoelectric augmentation in self-poled magnetic Fe₃O₄/poly(vinylidene fluoride) composite nanogenerators

Electrospray Deposition of Polyvinylidene Fluoride (PVDF) Microparticles: Impact of Solvents and Flow Rate

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Light intensity-induced phase transitions in graphene oxide doped polyvinylidene fluoride

Cited by 19 publications

References 29 publications

Poly(vinylidene fluoride) Intestinal Sleeve Implants for the Treatment of Obesity and Type 2 Diabetes

Poly(vinylidene fluoride) Intestinal Sleeve Implants for the Treatment of Obesity and Type 2 Diabetes

Dielectric and piezoelectric augmentation in self-poled magnetic Fe3O4/poly(vinylidene fluoride) composite nanogenerators

Electrospray Deposition of Polyvinylidene Fluoride (PVDF) Microparticles: Impact of Solvents and Flow Rate

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Dielectric and piezoelectric augmentation in self-poled magnetic Fe₃O₄/poly(vinylidene fluoride) composite nanogenerators