Electrokinetic Potential and Other Surface Properties of Polymer Foils and Their Modifications

Kolská, Zdeňka; Makajová, Z.; Kolářová, Kateřina; Slepičková, Nikola Kasálková; Trostová, Alena Řezníčková Simona; Siegel, Jakub; Švorčı́k, Václav

doi:10.5772/46144

Cited by 25 publications

(25 citation statements)

References 51 publications

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“…PTFE treated under DC holds the most negative ζ-potential values, which correspond to the highest surface charge. The untreated PTFE showed a value around pH 3.4, which coincides with the IEP found in literature [ 31 ]. The studied samples had negative charges indicating the presence of chemical groups which may be deprotonated.…”

Section: Discussionsupporting

confidence: 89%

Physical and Morphological Changes of Poly(tetrafluoroethylene) after Using Non-Thermal Plasma-Treatments

et al. 2018

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A commercial formulation of poly(tetrafluoroethylene) (PTFE) sheets were surface modified by using non-thermal air at 40 kHz frequency (DC) and 13.56 MHz radiofrequency (RF) at different durations and powers. In order to assess possible changes of PTFE surface properties, zeta potential (ζ), isoelectric points (IEPs) determinations, contact angle measurements as well as Scanning Electron Microscopy (SEM) and Atomic Force Microscopy (AFM) imaging were carried out throughout the experimentation. The overall outcome indicated that ζ-potential and surface energy progressively changed after each treatment, the IEP shifting to lower pH values and the implicit differences, which are produced after each distinct treatment, giving new surface topographies and chemistry. The present approach might serve as a feasible and promising method to alter the surface properties of poly(tetrafluoroethylene).

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Section: Discussionsupporting

confidence: 89%

Physical and Morphological Changes of Poly(tetrafluoroethylene) after Using Non-Thermal Plasma-Treatments

et al. 2018

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“…The evolution of zeta potential depends on the concentration of CHX in the nanoHA discs that can support the molecule-molecule interactions observed by FTIR and adsorption isotherms. This proportionality of zeta potential values of material surface versus adsorbed bioactive compound may be provide information about electrostatic interactions between charged surfaces, according to others authors [17,40,41]. Therefore, as the nanoHA discs are negatively charged and CHX has positive charge [38], the electrostatic interactions between the cationic group of CHX and phosphate groups of nanoHA surface discs may play a major role in the adsorption process.…”

Section: Discussionmentioning

confidence: 99%

Anti-sessile bacterial and cytocompatibility properties of CHX-loaded nanohydroxyapatite

Barros

Grenho

Fernandes

et al. 2015

Colloids and Surfaces B: Biointerfaces

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Nanohydroxyapatite possesses exceptional biocompatibility and bioactivity regarding bone cells and tis-sues, justifying its use as a coating material or as a bone substitute. Unfortunately, this feature may also encourage bacterial adhesion and biofilm formation. Surface functionalization with antimicrobials is a promising strategy to reduce the likelihood of bacterial infestation and colonization on medical devices. Chlorhexidine digluconate is a common and effective antimicrobial agent used for a wide range of medical applications. The purpose of this work was the development of a nanoHA biomaterial loaded with CHX to prevent surface bacterial accumulation and, simultaneously, with good cytocompatibility, for application in the medical field. CHX (5-1500 mg/L) was loaded onto nanoHA discs and the materials were evaluated for CHX adsorption and release profile, physic-chemical features, antibacterial activity against Escherichia coli, Staphylococcus aureus and Staphylococcus epidermidis, and cytocompatibility toward L929 fibroblasts. Results showed that the adsorption of CHX on nanoHA surface occurred by electrostatic inter-actions between the cationic group of CHX and the phosphate group of nanoHA. The release of CHX from CHX-loaded nanoHA showed a fast initial rate followed by a slower kinetics release, due to constraints caused by dilution and diffusion-limiting processes. NanoHA.50 to nanoHA.1500 showed strong anti-sessile activity, inhibiting bacterial adhesion and the biofilm formation. CHX-nanoHA caused a dose-and time-dependent inhibitory effect on the proliferation of fibroblasts for nanoHA.100 to nanoHA.1500. Cellular behavior on 2 nanoHA.5 and nanoHA.50 was similar to control. Therefore, CHX-loaded nanoHA surfaces appear as a promising alternative to prevention of devices-related infections.

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“…It is used for characterization of natural and synthetic fibres and in investigation of their hydrophilicity, which is important for their interactions with dyes and surfactants. It is also important for research of membranes, filters, pristine polymers or polymers modified by plasma, by laser or by chemical coatings, biphenyldithiol, polyethyleneglycol or by gold coatings (Hubbe 2006;Kolská et al 2013). One of the most important parameter obtained by zeta potential measurement is surface charging behaviour.…”

Section: Introductionmentioning

confidence: 99%

Electrokinetic properties of fibres functionalised by chitosan and chitosan nanoparticles

2015

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Adsorption of chitosan solution as well as chitosan nanoparticles dispersion onto cellulose fibres was implemented at pH = 4 and 7, respectively, in order to investigate the influence of different pH values on chitosan macromolecules' conformation and consequently on its adsorption ability and resultant coating morphology, as well as on antimicrobial activity of coated fibres. Adsorption capacity, charging behaviour and electrokinetical response of fibres at different pH values were analysed by determining zeta potential. Obtained results were related to the antimicrobial activity of fibres, determined by standard ASTM E2149 method.

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Electrokinetic Potential and Other Surface Properties of Polymer Foils and Their Modifications

Cited by 25 publications

References 51 publications

Physical and Morphological Changes of Poly(tetrafluoroethylene) after Using Non-Thermal Plasma-Treatments

Physical and Morphological Changes of Poly(tetrafluoroethylene) after Using Non-Thermal Plasma-Treatments

Anti-sessile bacterial and cytocompatibility properties of CHX-loaded nanohydroxyapatite

Electrokinetic properties of fibres functionalised by chitosan and chitosan nanoparticles

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