Plasma surface treatment of polyethylene terephthalate films for bacterial repellence

Amanatides, E.; Mataras, D.; Katsikogianni, Maria G.; Missirlis, Yannis F.

doi:10.1016/j.surfcoat.2005.11.002

Cited by 35 publications

(29 citation statements)

References 20 publications

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“…This may be explained by the fact that EG 3 retains interfacial water layers so that it prevents the direct contact between bacteria and surface. Moreover, in recent studies [70,71] we showed that S. epidermidis adhesion was reduced by He/O 2 plasma treated PET and this is in accordance with the Thermodynamic Theory since adhesion was observed to be negatively correlated with the free energy of adhesion ðDG adh do Þ and its polar component ðDG increases. This could be explained by the presence of hydrated layers at the He/O 2 treated surfaces and around bacteria, due to their hydrophilic-polar nature, which, during bacterial adhesion, overlap giving rise to repulsions which are commonly known as "hydrophilic repulsions" or "hydration forces" [30].…”

Section: Discussionsupporting

confidence: 83%

Theoretical and experimental approaches of bacteria‐biomaterial interactions

Missirlis¹,

Katsikogianni

2007

Materialwissenschaft Werkst

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Bacterial adhesion to surfaces is a complicated process influenced by many factors including the bacteria (surface energy and charge, molecular details), the substratum surface (chemical composition, roughness, configuration, surface energy and charge) and environmental factors (serum proteins, flow conditions, temperature, bacterial concentration, time of exposure, antibiotics). The models that have been proposed for the quantitative prediction of bacteria-material interactions are based on colloidal theories and macromolecular binding considerations. Two categories of techniques used in calculating bacterial adhesion strength and bacteriamaterial interactions have been proposed: those that utilize fluid flowing against adherent bacteria and those that manipulate single bacteria (atomic force microscopy and optical tweezers), and are concisely reviewed.

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Section: Discussionsupporting

confidence: 83%

Theoretical and experimental approaches of bacteria‐biomaterial interactions

Missirlis¹,

Katsikogianni

2007

Materialwissenschaft Werkst

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“…Comparing the SEM images of Figure 1A and Figure 1B, it is appreciated that untreated PP nanocomposites present a smoother surface, whereas plasma treated PP/nAg shows a rougher surface. The surface of the later is rougher since plasma reactive species collide with the nanocomposite surface producing chain scission and remove polymer chains located at the most external part of the nanocomposite, generating roughness of the surface [9][10][11]. Beake et al [12] reported the surface erosion of PET films treated by plasma.…”

Section: Resultsmentioning

confidence: 99%

Preparation of Polymer Nanocomposites with Enhanced Antimicrobial Properties

España‐Sánchez¹,

Ávila‐Orta²,

Neira‐Velázquez³

et al. 2012

MRS Proc.

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Plasma surface activation and antibacterial properties of nanocomposites of polypropylene/silver nanoparticles (PP/nAg) and nylon-6/silver nanoparticles (Ny6/nAg) were investigated. The nanocomposites were prepared by melt blending assisted by ultrasound, while surface activation was achieved by means of argon plasma. To evaluate the antimicrobial properties of the nanocomposites, pathogen microorganisms such as Pseudomonas aeruginosa and Aspergillus niger were tested. Scanning Electron Microscopy (SEM) analyses showed a uniform dispersion of nanoparticles within the polymer matrix, though the presence of some agglomerates was also appreciated. On the other hand, surface topography by Atomic Force Microscopy (AFM) suggested that ions from the argon plasma generated ion collisions with the surface of the nanocomposites removing or etching polymer from surface and improving silver nanoparticles exposure, increasing their antimicrobial properties as corroborated by antimicrobial analyses. Nanocomposites exposed to argon plasma presented higher antimicrobial properties than the ones not exposed. These results indicated that plasma treatment increased the contact area of the nanoparticles with the microorganisms and enhanced the antimicrobial properties of nanocomposites. The results also showed that PP/nAg nanocomposites presented higher bacterial inhibition than Ny6/nAg nanocomposites, indicating that the chemical structure of the polymer also plays a big role in the final performance of the composite.

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“…O 2 and Ar-O 2 plasmas have been successfully used for oxide films deposition [9,10], synthesis of metal oxide nanowires [11], sterilization and decontamination of medical instruments [1,12,13,14,15] and polymer surface treatment [3,16,17,18]. Furthermore, the O( 1 D) atoms present in Ar-O 2 plasma were shown to have the potential for surface activation [2].…”

Section: Introductionmentioning

confidence: 99%

Theoretical insight into Ar–O₂surface-wave microwave discharges

Kutasi

Guerra²,

Sá

2010

J. Phys. D: Appl. Phys.

104

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Abstract.A zero-dimensional kinetic model has been developed to investigate the coupled electron and heavy-particle kinetics in Ar-O 2 surface-wave microwave discharges generated in long cylindrical tubes, such as those launched with a surfatron or a surfaguide. The model has been validated by comparing the calculated electron temperature and species densities with experimental data available in the literature for different discharge conditions. Systematic studies have been carried out for a surfacewave discharge generated with 2.45 GHz field frequency in a 1 cm diameter quartz tube in Ar-O 2 mixture at 0.5-3 Torr pressures, which are typical conditions found in different applications. The calculations have been performed for the critical electron density n e =3.74×10 11 cm −3 . It has been found that the sustaining electric field decreases with Ar percentage in the mixture, while the electron kinetic temperature exhibits a minimum at about 80%Ar. The charged and neutral species densities have been calculated for different mixture compositions, from pure O 2 to pure Ar, and their creation and destruction processes have been identified. The O 2 dissociation degree increases with Ar addition into O 2 and dissociation degrees as high as 60% can be achieved. Furthermore, it has been demonstrated that the dissociation degree increases with the discharge tube radius, while decreases with the atomic surface recombination of O-atoms. The density of O − negative ions is very high in the plasma, the electronegativity of the discharge can be higher than 1, depending on the discharge conditions. §

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Plasma surface treatment of polyethylene terephthalate films for bacterial repellence

Cited by 35 publications

References 20 publications

Theoretical and experimental approaches of bacteria‐biomaterial interactions

Theoretical and experimental approaches of bacteria‐biomaterial interactions

Preparation of Polymer Nanocomposites with Enhanced Antimicrobial Properties

Theoretical insight into Ar–O₂surface-wave microwave discharges

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Plasma surface treatment of polyethylene terephthalate films for bacterial repellence

Cited by 35 publications

References 20 publications

Theoretical and experimental approaches of bacteria‐biomaterial interactions

Theoretical and experimental approaches of bacteria‐biomaterial interactions

Preparation of Polymer Nanocomposites with Enhanced Antimicrobial Properties

Theoretical insight into Ar–O2surface-wave microwave discharges

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Product

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Theoretical insight into Ar–O₂surface-wave microwave discharges