Characterization of Physical, Mechanical and Chemical Properties of Quiscal Fibres: The Influence of Atmospheric DBD Plasma Treatment

Relvas, Cátia; Castro, G; Rana, Sohel; Fangueiro, Raúl

doi:10.1007/s11090-015-9630-0

Cited by 25 publications

(16 citation statements)

References 20 publications

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“…From these curves, a slight improvement in stability due to the fiber treatment was observed between 250 and 350 °C, with the original NW SC presenting higher weight loss (around 10% higher) compared with all of the other treated samples. Between 375 and 650 °C, however, only small differences were observed, which were mainly attributed to the degradation of lignin [ 27 ]. On the other hand, between 675 and 750 °C, some differences were recorded, corresponding with the final residue.…”

Section: Resultsmentioning

confidence: 99%

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Effects of Wet/Dry-Cycling and Plasma Treatments on the Properties of Flax Nonwovens Intended for Composite Reinforcing

et al. 2016

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This research analyzes the effects of different treatments on flax nonwoven (NW) fabrics which are intended for composite reinforcement. The treatments applied were of two different kinds: a wet/dry cycling which helps to stabilize the cellulosic fibers against humidity changes and plasma treatments with air, argon and ethylene gases considering different conditions and combinations, which produce variation on the chemical surface composition of the NWs. The resulting changes in the chemical surface composition, wetting properties, thermal stability and mechanical properties were determined. Variations in surface morphology could be observed by scanning electron microscopy (SEM). The results of the X-ray photoelectron spectroscopy (XPS) showed significant changes to the surface chemistry for the samples treated with argon or air (with more content on polar groups on the surface) and ethylene plasma (with less content of polar groups). Although only slight differences were found in moisture regain and water retention values (WRV), significant changes were found on the contact angle values, thus revealing hydrophilicity for the air-treated and argon-treated samples and hydrophobicity for the ethylene-treated ones. Moreover, for some of the treatments the mechanical testing revealed an increase of the NW breaking force.

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Section: Resultsmentioning

confidence: 99%

“…Relvas et al . [ 27 ] found differences of around 14% in the residual weight after an equivalent TGA assay in quiscal fibers between 400 and 800 °C. The higher thermal stability was attributed to the formation of oxygen containing groups, which are more stable, thus avoiding complete degradation.…”

Section: Resultsmentioning

confidence: 99%

Effects of Wet/Dry-Cycling and Plasma Treatments on the Properties of Flax Nonwovens Intended for Composite Reinforcing

et al. 2016

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“…Besides improving surface functionalities, wettability, as well as better plant fiber/matrix interfacial t0020 properties, plasma treatment could also improve the mechanical properties of plant fibers. 28,30 This opened the doorway of utilizing some newly explored plant fibers such as Quiscal in technical applications through improvement of their surface and mechanical properties by plasma treatment. Fig.…”

Section: P0050mentioning

confidence: 99%

“…The grafting step can be eliminated using the plasma polymerization process in which surface activation and Figure 13.5 Schematic of continuous atmospheric plasma treatment process for plant fibers (A), improvement in fiber tenacity (B), and removal of fiber impurities at different plasma treatment doses (C). Source: Relves et al 30 350 Sustainable and Nonconventional Construction Materials using Inorganic Bonded Fiber Composites polymerization occur simultaneously. Plasma polymerization has been extensively used in anticorrosive surfaces and scratch resistance, chemical barrier, and water repellent coatings, since this is a clean and green (no solvent) process, reliable, reproducible, and suitable for wide varieties of monomers, different surfaces, and sample geometries.…”

Section: P0050mentioning

confidence: 99%

Macro- and nanodimensional plant fiber reinforcements for cementitious composites

Parveen

Rana

Fangueiro

2017

Sustainable and Nonconventional Construction Materials Using Inorganic Bonded Fiber Composites

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“…An atmospheric-pressure dielectric barrier discharge (AP-DBD) can be generated by injecting into the reactor gap a working gas such as helium, argon, nitrogen, oxygen, air, etc or a mixture of them, while at least two electrodes are energized by an electric power supply such as DC pulsed or AC, where the excitation frequency can range from line frequency [1] to high frequency [2]. The required voltage ranges, from a few kilovolts [3,4] to dozens of kilovolts [5,6], should establish an intense electric field across the gap sufficient to overcome the dielectric breakdown voltage of the applied gas, promoting ionization phenomena of some gas particles and, as a consequence, producing an atmospheric-pressure nonthermal plasma. It is out of thermodynamic equilibrium because the electron temperature is higher than the temperature of the ions or the neutral species.…”

Section: Introductionmentioning

confidence: 99%

Atmospheric-pressure dielectric barrier discharge generation by a full-bridge flying capacitor multilevel inverter

Peña‐Eguiluz

López-Fernández

Mercado-Cabrera

2017

Plasma Sci. Technol.

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A new configuration of a resonant full-bridge flying capacitor multicell inverter has been designed and constructed with the aim of achieving an extended output voltage frequency range with low harmonic distortion and reduced semiconductor commutation losses. This configuration was tested as a power supply for two different coaxial dielectric barrier discharge reactors, one of them employed for electric characterization and the other one for inorganic compound elimination in an aqueous solution. Two different gas mixtures, 90% Ar-10% O 2 and 80% Ar-20% O 2 , were individually supplied during the experiments; the results showed a highefficiency removal of meta-cresol (m-cresol) to the order of 98%, which was obtained by adding more oxygen to the plasma gas mixture.

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Characterization of Physical, Mechanical and Chemical Properties of Quiscal Fibres: The Influence of Atmospheric DBD Plasma Treatment

Cited by 25 publications

References 20 publications

Effects of Wet/Dry-Cycling and Plasma Treatments on the Properties of Flax Nonwovens Intended for Composite Reinforcing

Effects of Wet/Dry-Cycling and Plasma Treatments on the Properties of Flax Nonwovens Intended for Composite Reinforcing

Macro- and nanodimensional plant fiber reinforcements for cementitious composites

Atmospheric-pressure dielectric barrier discharge generation by a full-bridge flying capacitor multilevel inverter

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