Effect of helium DBD plasma treatment on the surface of wood samples

Holzforschung ◽  
2010 ◽  
Vol 64 (2) ◽  
Author(s):  
Mihai Asandulesa ◽  
Ionut Topala ◽  
Nicoleta Dumitrascu
Keyword(s):  
Plasma Treatment ◽  
Linseed Oil ◽  
Dynamic Contact Angle ◽  
Optical Emission ◽  
Dynamic Contact ◽  
Dbd Plasma ◽  
Adhesion Properties ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
Modified Surfaces

Abstract The effects of helium dielectric barrier discharge (He-DBD) plasma treatment has been studied aiming at the preparation of wood for profitable dye covering and impregnation with an antibacterial oil. Electrical and optical emission spectroscopy measurements were performed to characterise the He-DBD discharge. The hydrophilic/hydrophobic properties of the modified surfaces were studied by dynamic contact angle measurements. The spreading area of the wet spots was also evaluated as a function of wetting time. After He-DBD plasma exposure, the adhesion properties are substantially improved and the hydrophilic character of wood surface is enhanced. The behaviour of linseed oil drops on the modified surfaces confirmed the utility of He-DBD treatment.

scholarly journals Biomimetic nanostructures for the silicone-biosystem interface: tuning oxygen-plasma treatments of polydimethylsiloxane

2017 ◽  
Vol 9 (2) ◽  
Author(s):  
Bekim Osmani ◽  
Gabriela Gerganova ◽  
Bert Müller
Keyword(s):  
Plasma Treatment ◽  
Oxygen Plasma ◽  
Dynamic Contact Angle ◽  
Dynamic Contact ◽  
Oxygen Plasma Treatment ◽  
Pdms Film ◽  
Pdms Surface ◽  
Force Microscopy ◽  
Angle Measurements ◽  
Hydrophobic Recovery

AbstractPolydimethylsiloxanes (PDMS) have drawn attention because of their applicability in medical implants, soft robotics and microfluidic devices. This article examines the formation of dedicated nanostructures on liquid submicrometer PDMS films when exposed to oxygen-plasma treatment. We show that by using a vinyl-terminated PDMS prepolymer with a molecular weight of 800 g/mol, one can bypass the need of solvent, copolymer, or catalyst to fabricate wrinkled films. The amplitude and periodicity of the wrinkles is tuned varying the thickness of the PDMS film between 150 and 600 nm. The duration of the plasma treatment and the oxygen pressure determine the surface morphology. The amplitude was found between 30 and 300 nm with periodicities ranging from 500 to 2800 nm. Atomic force microscopy was used to measure film thickness, amplitude and wrinkle periodicity. The hydrophobic recovery of the nanostructured PDMS surface, as assessed by dynamic contact angle measurements, scales with nanostructure’s fineness, associated with an improved biocompatibility. The mechanical properties were extracted out of 10,000 nanoindentations on 50×50-μm

Dynamic contact angle measurements on superhydrophobic surfaces

2015 ◽  
Vol 27 (3) ◽  
pp. 032107 ◽  
Author(s):  
Jeong-Hyun Kim ◽  
H. Pirouz Kavehpour ◽  
Jonathan P. Rothstein
Keyword(s):  
Contact Angle ◽  
Dynamic Contact Angle ◽  
Dynamic Contact ◽  
Superhydrophobic Surfaces ◽  
Angle Measurements ◽  
Contact Angle Measurements

Initial bioadhesion on medical glass packaging materials investigated by dynamic contact angle measurements

2013 ◽  
Vol 210 (5) ◽  
pp. 983-987 ◽  
Author(s):  
Oliver Köhler ◽  
Christine Müller ◽  
Anne Hermsdörfer ◽  
Holger Röhl ◽  
Christiane Ziegler
Keyword(s):  
Contact Angle ◽  
Dynamic Contact Angle ◽  
Dynamic Contact ◽  
Packaging Materials ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
Glass Packaging ◽  
Medical Glass

Measurements of the Contact Angles for Various Fluids Which Are Widely Used in the Oilfields to Improve Oil Recovery

2018 ◽  
Author(s):  
M. Elsharafi ◽  
K. Vidal ◽  
R. Thomas
Keyword(s):  
Surface Tension ◽  
Contact Angle ◽  
Interfacial Tension ◽  
Oil Recovery ◽  
Dynamic Contact Angle ◽  
Dynamic Contact ◽  
Contact Angles ◽  
Rock Face ◽  
Angle Measurements ◽  
Contact Angle Measurements

Contact angle measurements are important to determine surface and interfacial tension between solids and fluids. A ‘water-wet’ condition on the rock face is necessary in order to extract oil. In this research, the objectives are to determine the wettability (water-wet or oil-wet), analyze how different brine concentrations will affect the wettability, and study the effect of the temperature on the dynamic contact angle measurements. This will be carried out by using the Cahn Dynamic Contact Angle. Analyzer DCA 315 to measure the contact angle between different fluids such as surfactant, alkaline, and mineral oil. This instrument is also used to measure the surface properties such as surface tension, contact angle, and interfacial tension of solid and liquid samples by using the Wilhelmy technique. The work used different surfactant and oil mixed with different alkaline concentrations. Varying alkaline concentrations from 20ml to 1ml were used, whilst keeping the surfactant concentration constant at 50ml.. It was observed that contact angle measurements and surface tension increase with increased alkaline concentrations. Therefore, we can deduce that they are directly proportional. We noticed that changing certain values on the software affected our results. It was found that after calculating the density and inputting it into the CAHN software, more accurate readings for the surface tension were obtained. We anticipate that the surfactant and alkaline can change the surface tension of the solid surface. In our research, surfactant is desirable as it maintains a high surface tension even when alkaline percentage is increased.

Sign in / Sign up

Export Citation Format

Share Document