Nitrogen plasma-based ion implantation of poly(tetrafluoroethylene): Effect of the main parameters on the surface properties

Kereszturi, Klára; Tóth, A.; Mohai, M.; Bertóti, I.; Szépvölgyi, János

doi:10.1016/j.apsusc.2010.04.021

Cited by 16 publications

(13 citation statements)

References 16 publications

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“…[ 71–73 ] Plasma immersion ion implantation with high ion fluence (10 16 ions cm −2 ) has previously been observed to lead to an increase in surface roughness due to etching. [ 74,75 ] The increase in hydrophobicity we observed is consistent with previous reports of plasma immersion ion implanted PTFE. [ 76,77 ]…”

Section: Resultssupporting

confidence: 91%

Hydrogel−Solid Hybrid Materials for Biomedical Applications Enabled by Surface‐Embedded Radicals

Walia

Akhavan

Kosobrodova

et al. 2020

Adv Funct Materials

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Combinations of hydrogels and solids provide high level functionality for devices such as tissue engineering scaffolds and soft machines. However, the weak bonding between hydrogels and solids hampers functionality. Here, a versatile strategy to develop mechanically robust solid−hydrogel hybrid materials using surface embedded radicals generated through plasma immersion ion implantation (PIII) of polymeric surfaces is reported. Evidence is provided that the reactive radicals play a dual role: inducing surface‐initiated, spontaneous polymerization of hydrogels; and binding the hydrogels to the surfaces. Acrylamide and silk hydrogels are formed and covalently attached through spontaneous reactions with the radicals on PIII activated polymer surfaces without cross‐linking agents or initiators. The hydrogel amount increases with incubation time, monomer concentration, and temperature. Stability tests indicate that 95% of the hydrogel is retained even after 4 months in PBS solution. T‐peel tests show that failure occurs at the tape−hydrogel interface and the hydrogel‐PIII‐treated PTFE interfacial adhesion strength is over 300 N m−1. Cell assays show no adhesion to the as‐synthesized hydrogels; however, hydrogels synthesized with fibronectin enable cell adhesion and spreading. These results show that polymers functionalized with surface‐embedded radicals provide excellent solid platforms for the generation of robust solid−hydrogel hybrid structures for biomedical applications.

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Section: Resultssupporting

confidence: 91%

Hydrogel−Solid Hybrid Materials for Biomedical Applications Enabled by Surface‐Embedded Radicals

Walia

Akhavan

Kosobrodova

et al. 2020

Adv Funct Materials

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“…The surface can be activated, i.e. the surface properties of polymers -including surface chemical composition and surface energy -can be modified by plasma treatment [13][14][15]. Plasma treatment can cause incorporation of polar functional groups, formation of dangling bonds, crosslinking and modification of surface roughness.…”

Section: Introductionmentioning

confidence: 99%

Layer-by-layer assembly of thin organic films on PTFE activated by cold atmospheric plasma

et al. 2014

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An air diffuse coplanar surface barrier discharge is used to activate the surface of polytetrafluoroethylene (PTFE) samples, which are subsequently coated with polyvinylpyrrolidone (PVP) and tannic acid (TAN) single, bi-and multilayers, respectively, using the dipcoating method. The surfaces are characterized by X-ray Photoelectron Spectroscopy (XPS), Attenuated Total Reflection -Fourier Transform Infrared Spectroscopy (ATR-FTIR) and Atomic Force Microscopy (AFM). The XPS measurements show that with plasma treatment the F/C atomic ratio in the PTFE surface decreases, due to the diminution of the concentration of CF 2 moieties, and also oxygen incorporation through formation of new C-O, C=O and O=C-O bonds can be observed. In the case of coated samples, the new bonds indicated by XPS show the bonding between the organic layer and the surface, and thus the stability of layers, while the gradual decrease of the concentration of F atoms with the number of deposited layers proves the creation of PVP/TAN bi-and multi-layers. According to the ATR-FTIR spectra, in the case of PVP/TAN multilayer hydrogen bonding develops between the PVP and TAN, which assures the stability of the multilayer. The AFM lateral friction measurements show that the macromolecular layers homogeneously coat the plasma treated PTFE surface.

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“…The significance of this study is that such relationships can be important in manufacturing and application of materials in general, and of PBII-treated materials in particular [1,[4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Structure–property and composition–property relationships for poly(ethylene terephthalate) surfaces modified by helium plasma-based ion implantation

Tóth

Vereš

Kereszturi

et al. 2011

Applied Surface Science

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The surfaces of untreated and helium plasma-based ion implantation (He PBII) treated poly(ethylene terephthalate) (PET) samples were characterised by reflectance colorimetry, contact angle studies and measurements of surface electrical resistance. The results were related to the structural and compositional data obtained by the authors earlier on parallel samples by XPS and Raman spectroscopy. Inverse correlations between lightness and I D /I G ratio and between chroma and I D /I G ratio were obtained, suggesting that the PBII-treated PET samples darken and their colourfulness decreases with the increase of the portion of aromatic sp 2 carbon rings in the chemical structure of the modified layer. Direct correlation between water contact angle and the I D /I G ratio and inverse correlations between surface energy and I D /I G ratio and between dispersive component of surface energy and I D /I G ratio were found, reflecting that surface wettability, surface energy and its dispersive component decrease with the formation of surface structure, characterised again by enhanced portion of aromatic sp 2 carbon rings. The surface electrical resistance decreased with the increase of the surface Ccontent determined by XPS and also with the increase of the surface concentration of conjugated double bonds, reflected by the increase of the * shake-up satellite of the C 1s peak.Keywords: poly(ethylene terephthalate), plasma-based ion implantation, colorimetry, wettability, electrical resistance IntroductionPlasma-based ion implantation (PBII), called also plasma immersion ion implantation (PIII or PI 3 ) is a versatile, relatively simple and cost-effective surface modification technique, alternative to conventional ion implantation. PBII treatment of poly(ethylene terephthalate) (PET) is a subject of current interest, due to promising applications in areas including packaging and biomaterial devices [1,2 and references therein]. Recently we studied the surface modification of PET by He PBII, applying XPS and Raman spectroscopy, including the effect of the main process parameters (acceleration voltage, fluence and fluence rate) on the alterations of the surface chemical composition and structure [2]. An important feature of using helium for PBII treatment is that in the energy range of interest of PBII treatment (actually above 2 keV), the stopping power of PET for He + ions is dominated by the electronic component [2], and therefore the structure of the modified layer may become ordered [3]. Due to its small atomic size, He + ion has a relatively large projected range, as

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Nitrogen plasma-based ion implantation of poly(tetrafluoroethylene): Effect of the main parameters on the surface properties

Cited by 16 publications

References 16 publications

Hydrogel−Solid Hybrid Materials for Biomedical Applications Enabled by Surface‐Embedded Radicals

Hydrogel−Solid Hybrid Materials for Biomedical Applications Enabled by Surface‐Embedded Radicals

Layer-by-layer assembly of thin organic films on PTFE activated by cold atmospheric plasma

Structure–property and composition–property relationships for poly(ethylene terephthalate) surfaces modified by helium plasma-based ion implantation

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