Moisture absorption studies of fluorocarbon films deposited from pentafluoroethane and octafluorocyclobutane plasmas

Tanikella, R.; Agraharam, Sairam; Allen, Sue Ann Bidstrup; Hess, Dennis W.; Kohl, Paul A.

doi:10.1007/s11664-002-0048-0

Cited by 13 publications

(7 citation statements)

References 20 publications

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“…A similar oxidation and low-molecular-weight oxidized material (LMWOM) formation process was reported in moisture uptake studies on plasma-deposited fluorocarbon films [47]. In this work however, the FT-IR signal did not show much variation in intensity, indicating that this mechanism was probably not the major reason of degradation.…”

Section: Resultssupporting

confidence: 78%

“…Thus the first pathway (by secondary carbons, pathway II) yields a variety of oxidized carbon functionalities with a low molecular weight, due to chain scission. A similar oxidation and low-molecular-weight oxidized material (LMWOM) formation process was reported in moisture uptake studies on plasma-deposited fluorocarbon films [ 47 ]. In this work however, the FT-IR signal did not show much variation in intensity, indicating that this mechanism was probably not the major reason of degradation.…”

Section: Resultsmentioning

confidence: 73%

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Toward High-Performance Coatings for Biomedical Devices: Study on Plasma-Deposited Fluorocarbon Films and Ageing in PBS

2010

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High performance coatings tailored to medical devices represent a recognised approach to modulate surface properties. Plasma-deposited fluorocarbon films have been proposed as a potential stent coating. Previous studies have shown promising adhesion properties: the 35 nm-thick film sustained plastic deformation up to 25% such as induced during the clinical implantation. In this study, the compositional and morphological changes of plasma-deposited fluorocarbon films were examined during ageing in a pseudo-physiological medium, a phosphate buffer solution (PBS), by angle-resolved XPS, FT-IR data and AFM images. The evolution of the ageing process is discussed: defluorination and crosslinking yielded an oxidized protective top layer onto the films, which showed further degradation.

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Section: Resultssupporting

confidence: 78%

Section: Resultsmentioning

confidence: 73%

Toward High-Performance Coatings for Biomedical Devices: Study on Plasma-Deposited Fluorocarbon Films and Ageing in PBS

2010

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“…It can be noted that the loss of fluorine and oxidation were more important for the nondeformed and aged samples etched X8. The instability of fluorocarbon films in aqueous medium could be explained by the formation of low-molecular-weight oxidized chains on the coating surface during the plasma deposition, as already described by Tanikella et al 64 and Touzin et al 58 Indeed, these chains are easily breakable and, upon aging, leave the surface and consequently, the fluorine concentration decreased. Similar observations were made after deformation followed by aging: oxidation and loss of fluorine were also observed with the three etching conditions.…”

Section: Coating Characterization the Surface Composition Wasmentioning

confidence: 74%

Influence of the 316 L Stainless Steel Interface on the Stability and Barrier Properties of Plasma Fluorocarbon Films

Lewis

Cloutier

Chevallier

et al. 2011

ACS Appl. Mater. Interfaces

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Coatings are known to be one of the more suited strategies to tailor the interface between medical devices and the surrounding cells and tissues once implanted. The development of coatings and the optimization of their adhesion and stability are of major importance. In this work, the influence of plasma etching of the substrate on a plasma fluorocarbon ultrathin coating has been investigated with the aim of improving the stability and the corrosion properties of coated medical devices. The 316 L stainless steel interface was subjected to two different etching sequences prior to the plasma deposition. These plasma etchings, with H(2) and C(2)F(6) as gas precursors, modified the chemical composition and the thickness of the oxide layer and influenced the subsequent polymerization. The coating properties were evaluated using flat substrates submitted to deformation, aging into aqueous medium and corrosion tests. X-ray photoelectron spectroscopy (XPS), time of flight-secondary ion mass spectrometry (ToF-SIMS), ellipsometry, and atomic force microscopy (AFM) were performed to determine the effects of the deformation and the aging on the chemistry and morphology of the coated samples. Analyses showed that plasma etchings were essential to promote reproducible polymerization and film growth. However, the oxide layer thinning due to the etching lowered the corrosion resistance of the substrate and affected the stability of the interface. Still, the deformed samples did not exhibited adhesion and cohesion failure before and after the aging.

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“…The increase of the O/C ratio could be associated with postoxidation during aging, which seems to be more important than contamination. [ 21,36,37 ] Concerning the acrylic acid‐based codeposits, no significant change of F/C and O/C ratios is observed between fresh and aged coatings, which are from 0.33 to 0.67 and from 0.24 to 0.43, respectively. These observations indicate that the aging effect is less marked for p‐AA‐co‐HDFD than p‐DAME‐co‐HDFD; in other words, p‐AA‐co‐HDFD resists hydrocarbon contamination more efficiently than p‐DAME‐co‐HDFD.…”

Section: Resultsmentioning

confidence: 99%

Role of the surface chemistry of plasma polymer layers on their long‐term antifogging behavior

Tran

Debarnot

Ortiz³

et al. 2020

Plasma Processes & Polymers

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The long‐term antifogging capability of plasma coatings obtained from a hydrophilic precursor, such as 2‐(dimethylamino)ethyl methacrylate or acrylic acid, and a hydrophobic monomer, 1H,1H,2H‐perfluoro‐1‐decene (HDFD), deposited on polycarbonate is studied for two different agings. These films, when freshly prepared, show simultaneous hydrophilicity/oleophobicity for HDFD concentrations <50%. They fulfill antifogging criteria: low water contact angle (<20°), high hexadecane contact angle around 70° and preservation of optical transparency after water vapor contact. Depending on their chemical structure, only p‐AA‐co‐HDFD with 20–40% of HDFD retain their antifogging properties after thermal aging, while all of them are altered when dipped in hot water. p‐AA‐co‐HDFD is more efficient than p‐DAME‐co‐HDFD in reducing airborne contamination and improving long‐term antifogging performance.

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Moisture absorption studies of fluorocarbon films deposited from pentafluoroethane and octafluorocyclobutane plasmas

Cited by 13 publications

References 20 publications

Toward High-Performance Coatings for Biomedical Devices: Study on Plasma-Deposited Fluorocarbon Films and Ageing in PBS

Toward High-Performance Coatings for Biomedical Devices: Study on Plasma-Deposited Fluorocarbon Films and Ageing in PBS

Influence of the 316 L Stainless Steel Interface on the Stability and Barrier Properties of Plasma Fluorocarbon Films

Role of the surface chemistry of plasma polymer layers on their long‐term antifogging behavior

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