Investigations on the Stability of Plasma Modified Silicone Surfaces

Rangel, Elidiane Cipriano; Gadioli, Giovana Z.; Cruz, Nilson Cristino da

doi:10.1023/b:papo.0000039815.07810.bd

Cited by 47 publications

(49 citation statements)

References 15 publications

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“…This may be the cause of reversible wettability. Another reason may be the thermodynamically driven reorientation of the polar species from the surface to the subsurface as reported to be observed in the case of plasma-treated polymer surfaces [11].…”

Section: Microstructure and Surface Wettabilitymentioning

confidence: 88%

Retracted: Study of the wettability of ZnO nanofilms

et al. 2012

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RetractionThis article was mistakenly published twice. For this reason this duplicate article has now been retracted. For citation purposes please cite the original: http://www.inljournal.com/?_action=articleInfo&article=21 Abstract Al-doped and un-doped ZnO thin films deposited on quartz substrates by the nebulized spray pyrolysis method were studied to investigate the wettability of the surface. The main objective of the present study was to investigate the wettability of ZnO thin film by changing the concentration of Al doping. Microstructure and water contact angles of the films were measured by scanning electron microscopy (SEM) and using a contact angle goniometer. SEM studies revealed that the grain size within the film increases with the doping concentration. The contact angles were studied to see the effect of aluminum doping on the hydrophilicity of the film. ZnO films were found to be hydrophobic in nature. A good correlation was observed between the SEM micrographs and contact angle results. The nature of the film was found to change from being hydrophobic to hydrophilic after the treatment in low-pressure DC glow discharge plasma, which, however, was reversible with the storage time.

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Section: Microstructure and Surface Wettabilitymentioning

confidence: 88%

Retracted: Study of the wettability of ZnO nanofilms

et al. 2012

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“…As a consequence of oxidation effects associated with the plasma treatment, and the re-orientation of fluorinated groups, the PDMS surface was more hydrophilic after plasma treatment. The antifouling potentialities of PDMS towards two species of marine bacteria was improved after CF 4 plasma treatment suggesting that the approach described for the fluorination of PDMS surfaces may be applied to minimize microbial adhesion.…”

Section: Discussionmentioning

confidence: 99%

“…With a simple one-step procedure the surface properties of the polymer can be changed significantly while the bulk properties remain unchanged. On the other hand, there are well-known drawbacks of this technique, as the heterogeneity of the obtained surface chemistry [3] and the lack of longterm stability (hydrophobic recovery) [4]. However, low pressure plasma treatment of polymers is an attractive approach, at least from a technological point of view, and many strategies were proposed to avoid or minimize the unfavourable mentioned side-effects.…”

Section: Introductionmentioning

confidence: 99%

Fluorination of poly(dimethylsiloxane) surfaces by low pressure CF4 plasma – physicochemical and antifouling properties

Cordeiro¹,

Nitschke²,

Janke³

et al. 2009

Express Polym. Lett.

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Abstract. Fluorinated surface groups were introduced into poly(dimethylsiloxane) (PDMS) coatings by plasma treatment using a low pressure radio frequency discharge operated with tetrafluoromethane. Substrates were placed in a remote position downstream the discharge. Discharge power and treatment time were tuned to alter the chemical composition of the plasma treated PDMS surface. The physicochemical properties and stability of the fluorine containing PDMS were characterized by X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM) and contact angle measurements. Smooth PDMS coatings with a fluorine content up to 47% were attainable. The CF4 plasma treatment generated a harder, non-brittle layer at the top-most surface of the PDMS. No changes of surface morphology were observed upon one week incubation in aqueous media. Surprisingly, the PDMS surface was more hydrophilic after the introduction of fluorine. This may be explained by an increased exposure of oxygen containing moieties towards the surface upon re-orientation of fluorinated groups towards the bulk, and/or be a consequence of oxidation effects associated with the plasma treatment. Experiments with strains of marine bacteria with different surface energies, Cobetia marina and Marinobacter hydrocarbonoclasticus, showed a significant decrease of bacteria attachment upon fluorination of the PDMS surface. Altogether, the CF4 plasma treatments successfully introduced fluorinated groups into the PDMS, being a robust and versatile surface modification technology that may find application where a minimization of bacterial adhesion is required.

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“…Modification of the plasma conditions may produce surfaces with different characteristics 9,10 . One of the surface properties that may be greatly modified by plasma exposure is the contact angle.…”

Section: Resultsmentioning

confidence: 99%

Evaluation of blood compatibility of plasma deposited heparin-like films and SF6 plasma treated surfaces

et al. 2010

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In devices used in open-heart surgery and dialysis, blood must be continuously processed using extracorporeal circuits composed of peristaltic pumps and active components such as specific filters and oxygenators. Several procedures have been employed to avoid blood coagulation induced by contact with the artificial surfaces of such devices. Often heparin, a bioactive protein able to prevent clot formation, is employed. In this work, we have used heparin-containing gas plasmas to evaluate the possibility of depositing adherent anticoagulant films onto PVC and glass surfaces. The films were produced by radiofrequency plasma enhanced chemical vapor deposition from heparin/isopropanol and heparin/hexamethyldisiloxane solutions. In addition, the effects of exposure to SF 6 plasmas on the compatibility of such surfaces have also been investigated. The blood compatibility was evaluated through the determination of the density of platelets and fibrinogen and activated partial thromboplastin (APTT) and prothrombin times (PT) of human blood freshly collected and after contact for 2.5 hours with different surfaces. The deposited films were also characterized by infrared spectroscopy, contact angle and surface energy measurements. The coagulation time of blood, placed in contact with glass substrates coated by PECVD films of heparin/isopropanol mixtures, and in contact with SF 6 plasma-treated PVC, increased by about 60 and 20%, respectively, compared to the values measured with untreated samples.

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Investigations on the Stability of Plasma Modified Silicone Surfaces

Cited by 47 publications

References 15 publications

Retracted: Study of the wettability of ZnO nanofilms

Retracted: Study of the wettability of ZnO nanofilms

Fluorination of poly(dimethylsiloxane) surfaces by low pressure CF4 plasma – physicochemical and antifouling properties

Evaluation of blood compatibility of plasma deposited heparin-like films and SF6 plasma treated surfaces

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