Abstract:Poly(ethylene terephthalate) (PET) has desirable qualities for medical application but it is a nonpolar material (γ p s = 0.6 dyn/cm) which results in its high interfacial tension with blood plasma ( γ SL = 50 dyn/cm). Modifications of the surface free energy components of PET by ion-beam treatments were investigated. Also the surface morphology of the treated PET by scanning electron microscopy was revealed. The influence of such modifications on biocompatibility of these materials was investigate… Show more
“…Depending on the intended use (implant, patches, ocular lens), the interfacial tension of a biomaterial coming into contact with biological fluids will have different values [ 40 ]. For a biomaterial that is designed to be used as a tissue engineering scaffold, the interfacial tension must be in the range of 1–3 mN/m for biocompatibility to be achieved [ 45 , 46 ].…”
This study presents the production, characterization, and application of celandine (Chelidonium majus L.) extracts (aqueous, acidic, alcoholic, and ultrasound) on wool fibers and their characterization. The study aims to obtain an ecologically dyed wool support that possesses biocompatible and antimicrobial activities. The plant extracts were characterized based on pH, total polyphenol content, and berberine content. Ecologically dyed wool supports were characterized based on scanning electron microscopy, levelness index, color measurements, contact angle indirect biocompatibility, and antibacterial analysis. According to the obtained results, celandine extract can be considered a potential candidate for the sustainable dyeing and functionalization of wool fibers.
“…Depending on the intended use (implant, patches, ocular lens), the interfacial tension of a biomaterial coming into contact with biological fluids will have different values [ 40 ]. For a biomaterial that is designed to be used as a tissue engineering scaffold, the interfacial tension must be in the range of 1–3 mN/m for biocompatibility to be achieved [ 45 , 46 ].…”
This study presents the production, characterization, and application of celandine (Chelidonium majus L.) extracts (aqueous, acidic, alcoholic, and ultrasound) on wool fibers and their characterization. The study aims to obtain an ecologically dyed wool support that possesses biocompatible and antimicrobial activities. The plant extracts were characterized based on pH, total polyphenol content, and berberine content. Ecologically dyed wool supports were characterized based on scanning electron microscopy, levelness index, color measurements, contact angle indirect biocompatibility, and antibacterial analysis. According to the obtained results, celandine extract can be considered a potential candidate for the sustainable dyeing and functionalization of wool fibers.
“…1. Basically, plasma is produced in an auxiliary plasma source (APS), which consists of a d.c. discharge with hot cathode arching in a stainless steel vessel with multipolar confinement system assured by permanent magnets mounted on the outside wall of the vessel [16]. The APS is mounted at one end of a cylindrical glass (Pyrex) tube with inner diameter of 44 mm and length of 420 mm in which the main d.c. discharge (MD) is produced between the APS and a cylindrical grounded anode placed at the other end of the tube.…”
In some experimental conditions the electron saturation current of a cylindrical probe placed in a magnetized plasma and oriented along the magnetic field lines shows a large increase when the probe is positively biased with respect to plasma potential. The increase might double the electron saturation current which is followed by a negative slope of the current-voltage characteristic when the positive bias of the probe is further increased. This particular behavior was investigated versus probe length (0 − 5 mm) and radius, probe orientation with respect to the magnetic field lines, magnetic field strength (up to 0.42 T), gas nature and pressure, respectively. The increase of both electron current intensity and negative slope are well pronounced starting with a certain length of the probe and strongly dependent on probe orientation along the magnetic field lines. These particularities are also more pronounced with increasing of both magnetic field strength and mass of the gas atoms. Strong oscillations of the probe current are present in the negative slope region of the probe characteristic.Moreover, the light intensity emitted by plasma volume, where the probe is located, is also dependent on the probe bias. It shows a clear sharp maximum around plasma potential. A qualitative explanation of the probe characteristics with a negative slope obtained with the cylindrical probe is proposed.
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