Structural studies of plasma polymers obtained in pulsed dielectric barrier discharge of TEOS and HMDSO on nylon 66 fabrics

Kale, Kiran; Palaskar, Shital S.

doi:10.1080/00405000.2012.660757

Cited by 23 publications

(25 citation statements)

References 29 publications

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“…As expected, the presence of the hydrogen-bonded secondary amide is confirmed by the in-plane N H deformation vibration of the peak shoulder at 720 cm −1 . The band at 680 cm −1 is attributed to the bending of O C N group [39]. After the blind dyeing, the plasma treated sample shows a significant increase in the intensity and broadening of the C O stretching band as well as of the bending band of the O C N group were observed.…”

Section: Ftir Analysismentioning

confidence: 95%

Dyeing mechanism and optimization of polyamide 6,6 functionalized with double barrier discharge (DBD) plasma in air

Oliveira

Zille

Souto

2014

Applied Surface Science

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The physico-chemical improvements occasioned by DBD plasma discharge in dyeing process of polyamide 6,6 (PA66) fibers were investigated. The SEM, fluorescence microscopy, UV-vis spectroscopy, surface energy, FTIR, XPS and pH of aqueous extracts confirm the high polar functionalization of PA66 fibers due to plasma incorporation of oxygen atoms from atmospheric air. DBD plasma-generated reactive species preferentially break the C N bonds, and not the aliphatic CC chain of PA66. Formation of low-molecular weight acidic molecules that act as dye "carrier" and creation of micro-channels onto PA66 surface seems to favor dye diffusion into the fiber cores. Plasma treatment allows high level of direct dye diffusion and fixation in PA66 fibers at lower temperatures and shorter dyeing times than traditional dyeing methods.

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Section: Ftir Analysismentioning

confidence: 95%

Dyeing mechanism and optimization of polyamide 6,6 functionalized with double barrier discharge (DBD) plasma in air

Oliveira

Zille

Souto

2014

Applied Surface Science

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“…To this end, we employed five commercial AgNPs with sizes of 10, 20, 40, 60, and 100 nm for the fabrics coating. The particles were deposited on plasma-treated polyamides and their properties analyzed after 30 days of aging and after applying different number of washing cycles (up to 20). Fourier transform infrared attenuated total reflection (FTIR-ATR), UV−vis, and reflectance spectroscopies, static and dynamic contact angle measurements, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and and X-ray photoelectron spectroscopy (XPS) were used to characterize the fabrics and the deposited AgNPs.…”

Section: Introductionmentioning

confidence: 99%

Size and Aging Effects on Antimicrobial Efficiency of Silver Nanoparticles Coated on Polyamide Fabrics Activated by Atmospheric DBD Plasma

Zille

Fernandes

Francesko

et al. 2015

ACS Appl. Mater. Interfaces

114

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This work studies the surface characteristics, antimicrobial activity, and aging effect of plasma-pretreated polyamide 6,6 (PA66) fabrics coated with silver nanoparticles (AgNPs), aiming to identify the optimum size of nanosilver exhibiting antibacterial properties suitable for the manufacture of hospital textiles. The release of bactericidal Ag(+) ions from a 10, 20, 40, 60, and 100 nm AgNPs-coated PA66 surface was a function of the particles' size, number, and aging. Plasma pretreatment promoted both ionic and covalent interactions between AgNPs and the formed oxygen species on the fibers, favoring the deposition of smaller-diameter AgNPs that consequently showed better immediate and durable antimicrobial effects against Gram-negative Escherichia coli and Gram-positive Staphylococcus aureus bacteria. Surprisingly, after 30 days of aging, a comparable bacterial growth inhibition was achieved for all of the fibers treated with AgNPs <100 nm in size. The Ag(+) in the coatings also favored the electrostatic stabilization of the plasma-induced functional groups on the PA66 surface, thereby retarding the aging process. At the same time, the size-related ratio (Ag(+)/Ag(0)) of the AgNPs between 40 and 60 nm allowed for the controlled release of Ag(+) rather than bulk silver. Overall, the results suggest that instead of reducing the size of the AgNPs, which is associated with higher toxicity, similar long-term effects can be achieved with larger NPs (40-60 nm), even in lower concentrations. Because the antimicrobial efficiency of AgNPs larger than 30 nm is mainly ruled by the release of Ag(+) over time and not by the size and number of the AgNPs, this parameter is crucial for the development of efficient antimicrobial coatings on plasma-treated surfaces and contributes to the safety and durability of clothing used in clinical settings.

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“…This can be explained by the fact that the contact angle depends on the surface wettability, therefore on the roughness and the surface chemistry of the material [31]. Kale et al [32] demonstrated that the use of a pulsed plasma discharge made it possible to obtain more hydrophilic tetraethylorthosilicate and hexamethyldisiloxane polymers than those obtained in continuous plasma discharge from the same precursors because of the lower density and more organic nature of the materials obtained in pulsed synthesis conditions. While Inagaki et al [33] have shown that the surface properties are rather related to the surface chemistry of the materials (presence of active function on the surface of the membrane) when the plasma films are totally amorphous.…”

Section: Evaluation Of the Hydrophilic / Hydrophobic Character Of Pecvd Membranesmentioning

confidence: 99%

Sorption and permeation of water through Plasma Enhanced Chemical Vapour Deposited phosphonic acid-based membranes

et al. 2020

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Phosphonic acid-based membranes were prepared by Plasma Enhanced Chemical Vapor Deposition (PECVD) with an input power of 100 W in a continuous or pulsed glow discharge. Comparing both kinds of plasma discharges makes appear that the pulsed configuration gives rise to PECVD materials with longer hydrocarbon chains and thus higher flexible polymer network which consequently present better sorption properties than those prepared from a continuous plasma discharge. Being more hydrophilic and richer in acidic functions than Nafion® 212, PECVD membranes (whatever the kind of plasma discharge, pulsed or continuous, during the deposition of films) present a better water sorption ability. Nevertheless, having a more highly cross-linked structure, they have a lower water diffusion/permeation capacity. Consequently PECVD membranes show singular water management properties which could be a great advantage for the final Proton-Exchange Membrane Electrolyte Cells and Proton-Exchange Membrane Fuel Cells applications.

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Structural studies of plasma polymers obtained in pulsed dielectric barrier discharge of TEOS and HMDSO on nylon 66 fabrics

Cited by 23 publications

References 29 publications

Dyeing mechanism and optimization of polyamide 6,6 functionalized with double barrier discharge (DBD) plasma in air

Dyeing mechanism and optimization of polyamide 6,6 functionalized with double barrier discharge (DBD) plasma in air

Size and Aging Effects on Antimicrobial Efficiency of Silver Nanoparticles Coated on Polyamide Fabrics Activated by Atmospheric DBD Plasma

Sorption and permeation of water through Plasma Enhanced Chemical Vapour Deposited phosphonic acid-based membranes

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