Plasma-modified polymer surfaces: Characterization using XPS

Vandencasteele, Nicolas; Reniers, François

doi:10.1016/j.elspec.2009.12.003

Cited by 226 publications

(169 citation statements)

References 135 publications

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“…Apparently, these significant shifts in the BE values of N atoms are attributed to the interactions of the drug and the respective polymers. These also are due to the heavy protonation effect of N atoms in the spray dried particles resulting in the interaction via the amide group of the drug and the carboxyl group of the polymers [24][25][26]. The calculated low N coefficient values in the formulations revealed that the interactions between the drug and polymers are quite strong.…”

Section: Surface Elemental Analysis Via Xpsmentioning

confidence: 99%

RETRACTED: Evaluation of the surface chemistry and drug-polymer interaction of semi-crystalline micro-particles for the development of controlled release formulations

Mithu

Haque

Chowdhry

et al. 2017

Materials Science and Engineering: C

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Section: Surface Elemental Analysis Via Xpsmentioning

confidence: 99%

RETRACTED: Evaluation of the surface chemistry and drug-polymer interaction of semi-crystalline micro-particles for the development of controlled release formulations

Mithu

Haque

Chowdhry

et al. 2017

Materials Science and Engineering: C

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“…The spectrum of the pristine BPP shows a signal at ∼286.0 eV and a relative small signal at ∼288.4 eV which are attributed to C-O and C=O functional groups, respectively. [29][30][31] The BPP aged in SOC 10% shows a spectrum similar to the pristine one, whereas, the BPPs aged at higher SOCs reveal pronounced signals associated with oxygen functional groups. The intensities of both signals (C-O and C=O) are highest for the BPP aged in 90% SOC electrolyte, indicating the stronger oxidation of the surface in good agreement with the electrochemical measurements.…”

Section: Resultsmentioning

confidence: 98%

“…The pristine BPP exhibits significant signals related to sp 2 -hybridized carbon (C=C, graphite) at a binding energy of ∼284.2 eV and to sp 3 -hybridized carbon (C-C, mainly polypropylene) at a binding energy of ∼284.8 eV. [29][30][31] After ex-situ electrochemical aging the C=C signal decreases and the C-C signal raises with increasing SOC of the electrolyte. This effect indicates the damage of the sp 2 -hybridized graphitic structure during the electrochemical aging.…”

Section: Resultsmentioning

confidence: 99%

Bulk Aging of Graphite-Polypropylene Current Collectors Induced by Electrochemical Cycling in the Positive Electrolyte of Vanadium Redox Flow Batteries

Satola

Komsiyska

Wittstock

2017

J. Electrochem. Soc.

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Carbon-based bipolar plates (BPP) are essential components of the vanadium redox flow battery (VRFB) stack guaranteeing electrical conductivity and physical separation of adjacent cells. They are usually made of composite materials with complex structures containing conductive carbon components and polymer binder materials. In order to investigate their aging by simulation of repetitive charging/discharging conditions in areas with sluggish electrolyte flow, commercially available graphite-polypropylene BPPs were subjected to galvanodynamic treatment under diffusion limitation conditions in a three electrode electrochemical cell with positive electrolyte (VO2+/VO2+) using different states of charge (SOC). The current was swept between 100 and −100 mA/cm2. After aging, cyclic voltammetry (CV) in diluted H2SO4 was used to analyze the change in double layer capacitance and redox activity of the BPPs. Morphological investigations of the surface texture and bulk material were performed by means of scanning electron and confocal microscopies as well as by X-ray computed microtomography. After 3000 sweeping cycles in the positive electrolyte at high SOC the BPP showed an increase in double layer capacitance as well as higher roughness and increase in open pore volume in depths up to 100 μm. The aging effects are ascribed to oxidation and corrosion of the surface.

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“…4). A third band at higher binding energy is due to oxidized carbon atoms [19]- [21]. After ion implantation of both C + and Au 2+ into PLC, the C 1s spectra are characterized by a single peak; however, the vibrational states for each of the primary lines are responsible for the observed spectrum (Fig.…”

Section: Resultsmentioning

confidence: 99%

Oxidation Behavior of C- and Au-Ion-Implanted Biodegradable Polymers

Sokullu

Oztarhan

Tıhmınlıoğlu

et al. 2012

IEEE Trans. Plasma Sci.

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Abstract-Biodegradable polymers are widely used in biomedical and tissue engineering applications due to their biocompatibility and hydrolysis properties in the body. However, their low surface energy and lack of functional groups to interact with the cellular environment have limited their applications for in vivo studies. Ion beam modification is a convenient method for improving the surface properties of polymeric materials for functional biomedical applications. In the work described here, vacuum arc metal ion implantation was used to modify the composition of the near-surface region of three kinds of polymers-poly(L-lactide), poly(D, L-lactide-co-glycolide), and poly(L-lactide/caprolactone)-chosen as representative of biodegradable polymers. X-ray photoelectron spectroscopy analysis was used to characterize the chemical effects of these polymers after implantation with C and with Au, and the results were compared with untreated control samples. We find that oxidation behavior is brought about for certain implantation fluences, resulting in improved surface hydrophilicity.Index Terms-Biodegradable polymers, ion implantation, surface characterization, X-ray photoelectron spectroscopy (XPS).

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Plasma-modified polymer surfaces: Characterization using XPS

Cited by 226 publications

References 135 publications

RETRACTED: Evaluation of the surface chemistry and drug-polymer interaction of semi-crystalline micro-particles for the development of controlled release formulations

RETRACTED: Evaluation of the surface chemistry and drug-polymer interaction of semi-crystalline micro-particles for the development of controlled release formulations

Bulk Aging of Graphite-Polypropylene Current Collectors Induced by Electrochemical Cycling in the Positive Electrolyte of Vanadium Redox Flow Batteries

Oxidation Behavior of C- and Au-Ion-Implanted Biodegradable Polymers

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