Case Study of Polyvinylidene Fluoride Doping by Carbon Nanotubes

Kaspar, Pavel; Sobola, Dinara; Částková, Klára; Dallaev, Rashid; Šťastná, Eva; Sedlák, Petr; Knápek, Alexandr; Trčka, Tomáš; Holcman, Vladimír

doi:10.3390/ma14061428

Cited by 61 publications

(42 citation statements)

References 42 publications

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“…Typical Raman spectra of PVDF material in Figure 7 a describes a molecular parameters in the range of 150 cm −1 to 3150 cm −1 . Attention was focused on the spectrum in the range of 760 cm −1 to 880 cm −1 , where α- and β-phase peaks are illustrated in detail and differences in their ratio are measured [ 38 ]. The differences in ratio on the two different types of samples are less noticeable in Raman spectroscopy, and therefore FTIR was used for a more precise comparison of the β-phase [ 39 ].…”

Section: Resultsmentioning

confidence: 99%

Comprehensive Characterization of PVDF Nanofibers at Macro- and Nanolevel

et al. 2022

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This study is focused on the characterization and investigation of polyvinylidene fluoride (PVDF) nanofibers from the point of view of macro- and nanometer level. The fibers were produced using electrostatic spinning process in air. Two types of fibers were produced since the collector speed ( 300rpm and 2000rpm) differed as the only one processing parameter. Differences in fiber’s properties were studied by scanning electron microscopy (SEM) with cross-sections observation utilizing focused ion beam (FIB). The phase composition was determined by Fourier-transform infrared spectroscopy (FTIR) and Raman spectroscopy. The crystallinity was determined by differential scanning calorimetry (DSC), and chemical analysis of fiber’s surfaces and bonding states were studied using X-ray photoelectron spectroscopy (XPS). Other methods, such as atomic force microscopy (AFM) and piezoelectric force microscopy (PFM), were employed to describe morphology and piezoelectric response of single fiber, respectively. Moreover, the wetting behavior (hydrophobicity or hydrophilicity) was also studied. It was found that collector speed significantly affects fibers alignment and wettability (directionally ordered fibers produced at 2000rpm almost super-hydrophobic in comparison with disordered fibers spun at 300rpm with hydrophilic behavior) as properties at macrolevel. However, it was confirmed that these differences at the macrolevel are closely connected and originate from nanolevel attributes. The study of single individual fibers revealed some protrusions on the fiber’s surface, and fibers spun at 300rpm had a core-shell design, while fibers spun at 2000rpm were hollow.

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Section: Resultsmentioning

confidence: 99%

Comprehensive Characterization of PVDF Nanofibers at Macro- and Nanolevel

et al. 2022

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“…The fluid rate is determined by the Darcy's law. A decrease in the permeability of the porous medium due to particle deposition has been described by different approaches [21]. The pore volume reduction due to particle entrapment could be associated with permeability decrease [22].…”

Section: Methodsmentioning

confidence: 99%

A Theoretical Analysis of Profile Conformance Improvement Due to Suspension Injection

et al. 2021

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This study is focused on a solution for the problem of suspension penetration in a porous formation. Such a solution forms the basis of injection profile diversion technology for oil reservoir sweep improvement. A conventional model of deep-bed suspension flow was used to describe the suspension injection process. The suspension slug was followed by water injection, and the inflow injection profile before and after treatment was investigated. For the first time, the criteria that determine the effectiveness of the inflow profile improvement process are introduced. The effect of the suspension filtration coefficient on the particle penetration depth was studied. A specific filtration coefficient value for the maximum penetration depth was achieved. The obtained analytical solution was generalized on multi-reservoir strata with poor interlayer crosslinking. The efficiency of profile conformance improvement was described by the differences in the root-mean-square deviations of the inflow velocities in interlayers from mean values before and after the treatment. It was shown that the complex criterion of suspension treatment efficiency should include a reduction in total injectivity. An increase in suspension slug volume improves the injectivity profile but decreases the total injectivity of an injector.

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“…In the spun PVDF material, fibers with a larger diameter were mainly formed, which could be caused by a higher viscosity of the precursor or a small distance between the collector and the emitter-low collector speeds can be excluded in this case [12,13].…”

Section: Fiber Defectsmentioning

confidence: 99%

Structure Tuning and Electrical Properties of Mixed PVDF and Nylon Nanofibers

et al. 2021

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The paper specifies the electrostatic spinning process of specific polymeric materials, such as polyvinylidene fluoride (PVDF), polyamide-6 (PA6, Nylon-6) and their combination PVDF/PA6. By combining nanofibers from two different materials during the spinning process, new structures with different mechanical, chemical, and physical properties can be created. The materials and their combinations were subjected to several measurements: scanning electron microscopy (SEM) to capture topography; contact angle of the liquid wettability on the sample surface to observe hydrophobicity and hydrophilicity; crystallization events were determined by differential scanning calorimetry (DSC); X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, and Fourier-transform infrared spectroscopy (FT-IR) to describe properties and their changes at the chemical level. Furthermore, for the electrical properties of the sample, the dielectric characteristics and the piezoelectric coefficient were measured. The advantage of the addition of co-polymers was to control the properties of PVDF samples and understand the reasons for the changed functionality. The innovation point of this work is the complex analysis of PVDF modification caused by mixing with nylon PA6. Here we emphasize that the application of nylon during the spin influences the properties and structure (polarization, crystallization) of PVDF.

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Case Study of Polyvinylidene Fluoride Doping by Carbon Nanotubes

Cited by 61 publications

References 42 publications

Comprehensive Characterization of PVDF Nanofibers at Macro- and Nanolevel

Comprehensive Characterization of PVDF Nanofibers at Macro- and Nanolevel

A Theoretical Analysis of Profile Conformance Improvement Due to Suspension Injection

Structure Tuning and Electrical Properties of Mixed PVDF and Nylon Nanofibers

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