B219 Change in Contact Angle by Plasma Irradiation and Evaporation of Water Drop

2001 ◽  
Vol 2001 (0) ◽  
pp. 417-418
Author(s):  
Sumitomo HIDAKA ◽  
Yasuyuki TAKATA ◽  
Takehiro ITO
Keyword(s):  
Contact Angle ◽  
Water Drop ◽  
Plasma Irradiation

scholarly journals Change in Wettability by Plasma Irradiation and Evaporation of Water Drop

2002 ◽  
Vol 2002 (0) ◽  
pp. 75-76
Author(s):  
Sumitomo HIDAKA ◽  
Hiroshi YAMAMOTO ◽  
Akimitu YAMASHITA ◽  
Yasuyuki TAKATA ◽  
Takehiro ITO
Keyword(s):  
Water Drop ◽  
Plasma Irradiation

scholarly journals Effect of Nanoparticles on Wettability of Nanocoating on Carbon Steel

2016 ◽  
Vol 1 (2) ◽  
pp. 71-74
Author(s):  
Norhasnidawani Johari ◽  
Noor Azlina Hassan ◽  
Norita Hassan ◽  
Mohd Hanafi Ani
Keyword(s):  
Contact Angle ◽  
Carbon Steel ◽  
Metal Oxide ◽  
Water Drop ◽  
Metal Oxide Nanoparticles ◽  
Sol Gel ◽  
Hydrophobic Surface ◽  
Oxide Nanoparticles ◽  
Water Medium ◽  
Wetting Ability

Nanocoatings plays an important role in coating industry. The solution was being prepared through copolymerization of epoxy resin hardener and with the incorporation of metal oxide nanoparticles, Zinc Oxide (ZnO) and Silica (SiO2). ZnO and SiO2 were synthesized using sol-gel. Epoxy hardener acted as host while the metal oxide nanoparticles as guest components. The formulation of nanocoatings with excellent adhesion strength and corrosion protection of carbon steel was studied. The performance of wetting ability with different medium was analysed using contact angle. Water medium showed the addition of 3wt% of hybrid between ZnO and SiO2 was the best nanocoating to form hydrophobic surface and was also the best nanocoating surface to form hydrophilic surface with vacuum oil dropping. In oil dropping, the contact angle was smaller than 90° and the water drop tends to spreads on surface.

Clay effects on the contact angle and water drop penetration time of model soils

2010 ◽  
Vol 56 (3) ◽  
pp. 371-375 ◽  
Author(s):  
D. A. L. Leelamanie ◽  
Jutaro Karube ◽  
Aya Yoshida
Keyword(s):  
Contact Angle ◽  
Water Drop ◽  
Penetration Time

scholarly journals Ultraviolet irradiation improves the hydrophilicity and osteo-conduction of hydroxyapatite

2020 ◽  
Author(s):  
Sho Kaneko ◽  
Yuji Yamamoto ◽  
Kaniichro Wada ◽  
Gentaro Kumagai ◽  
Yoshifumi Harada ◽  
...  
Keyword(s):  
Contact Angle ◽  
Uv Irradiation ◽  
Uv Light ◽  
Water Drop ◽  
Area Ratio ◽  
Bone Volume ◽  
High Porosity ◽  
Bone Area ◽  
Dental Surgery ◽  
Significant Difference

Abstract Background Treating a titanium or titanium alloy implant with ultraviolet (UV) light is known to improve its associated cell growth and osseointegration. However, little is known about the effect of UV irradiation on hydroxyapatite (HA), which is also used frequently in orthopaedic and dental surgery. Here we examined the effect of UV irradiation on the hydrophilicity of HA, and on its osteoconduction ability in rats. Methods HA implants of low and high porosity were treated with UV light, and photofunctionalisation was assessed by the contact angle of a water drop on the surface. HA implants were also inserted into rat femurs, and the rats were killed two or four weeks later. The bone volume and bone area ratio were calculated from microcomputed tomography and histological data. Results The contact angle of a water drop on HA implants of both porosities was significantly reduced after UV irradiation. In the rat femurs, there was no significant difference in the bone volume between the UV light-treated and control implants at two or four weeks. The bone area ratio for the UV light-treated versus control implants was significantly increased at two weeks, but there was no significant difference at four weeks. Conclusions The surface of UV-irradiated HA disks was hydrophilic, in contrast to that of non-irradiated HA disks. Photofunctionalisation accelerated the increase in the bone area ratio in the early healing stage. This technology can be applied to surgical cases requiring the early fusion of bone and HA.

scholarly journals Ultraviolet irradiation improves the hydrophilicity and osteo-conduction of hydroxyapatite

2020 ◽  
Author(s):  
Sho Kaneko ◽  
Yuji Yamamoto ◽  
Kaniichro Wada ◽  
Gentaro Kumagai ◽  
Yoshifumi Harada ◽  
...  
Keyword(s):  
Contact Angle ◽  
Uv Irradiation ◽  
Uv Light ◽  
Water Drop ◽  
Area Ratio ◽  
Bone Volume ◽  
High Porosity ◽  
Bone Area ◽  
Dental Surgery ◽  
Significant Difference

Abstract Background: Treating a titanium or titanium alloy implant with ultraviolet (UV) light is known to improve its associated cell growth and osseointegration. However, little is known about the effect of UV irradiation on hydroxyapatite (HA), which is also used frequently in orthopaedic and dental surgery. Here we examined the effect of UV irradiation on the hydrophilicity of HA, and on its osteoconduction ability in rats. Methods: HA implants of low and high porosity were treated with UV light, and photofunctionalisation was assessed by the contact angle of a water drop on the surface. HA implants were also inserted into rat femurs, and the rats were killed two or four weeks later. The bone volume and bone area ratio were calculated from microcomputed tomography and histological data. Results: The contact angle of a water drop on HA implants of both porosities was significantly reduced after UV irradiation. In the rat femurs, there was no significant difference in the bone volume between the UV light-treated and control implants at two or four weeks. The bone area ratio for the UV light-treated versus control implants was significantly increased at two weeks, but there was no significant difference at four weeks. Conclusions: The surface of UV-irradiated HA disks was hydrophilic, in contrast to that of non-irradiated HA disks. Photofunctionalisation accelerated the increase in the bone area ratio in the early healing stage. This technology can be applied to surgical cases requiring the early fusion of bone and HA.

Quantitative Characterization of Surface Polarity Dependence of Wetting Properties of V-Doped SiC Using a Novel Image Analysis Technique

2020 ◽  
Vol 1004 ◽  
pp. 284-289 ◽  
Author(s):  
Jung Gon Kim ◽  
Woo Sik Yoo ◽  
Dae Sung Kim ◽  
Won Jae Lee
Keyword(s):  
Contact Angle ◽  
Image Analysis ◽  
Specific Surface ◽  
Room Temperature ◽  
Water Drop ◽  
Native Oxide ◽  
Surface Polarity ◽  
Temperature Oxidation ◽  
Wetting Properties ◽  
Oxide Removal

Vanadium doped semi-insulating (SI) 6H-SiC {0001} substrates and their wetting properties were characterized using precisely dispensed de-ionized (DI) water drops. Radius, contact angle, width (chord), height and cap volume of a DI water drop on the SiC surface were quantitatively determined by analyzing sideview images of DI water drop in contact with SI 6H-SiC {0001} substrates using image processing software. The average of ten (10) contact angle measurements showed approximately 4 ° difference between the Si-face (48.48°) and the C-face (44.33º). Contact angle on the Si-face (0001) measured after native oxide removal showed significant decrease of contact angle, from 55° to 25° and recovered over time by room temperature oxidation in air. In contrast, contact angle on the C-face (000-1), measured after native oxide removal, showed significant increase of contact angle, from 40° to 54°, and continue to increase contact angle up to 71° after room temperature oxidation for 24 hours in air. Contact angle is found to be very sensitive to SiC surface polarity and specific surface conditions. Contact angle measurement, using image analysis techniques, can be applied as an in-line identification and surface condition characterization technique for SiC polytypes of specific surface polarities.

In Vitro Cytocompatibility of Silver-Containing Hydroxyapatite Coatings

2009 ◽  
Vol 620-622 ◽  
pp. 567-570 ◽  
Author(s):  
Yi Kai Chen ◽  
Xue Bin Zheng ◽  
Baoe Li ◽  
You Tao Xie ◽  
Chuan Xian Ding ◽  
...  
Keyword(s):  
Contact Angle ◽  
Antibacterial Property ◽  
Water Drop ◽  
Contact Angles ◽  
Hydroxyapatite Coating ◽  
Vacuum Plasma Spraying ◽  
Vacuum Plasma ◽  
Hydroxyapatite Coatings ◽  
Spraying Method

In this paper, antibacterial silver-containing hydroxyapatite coating was prepared by vacuum plasma spraying method and osteoblasts were seeded onto the surface of the coating to evaluate its cytocompatibility. The results indicated that the cells proliferated well on the samples, and the proliferation rate on the silver-containing hydroxyapatite coating was a little bit higher than that on the silver-free hydroxyapatite coating. The contact angle of water drop on the coating was measured, and it was found that the contact angles of the silver-containing hydroxyapatite coatings were smaller than the hydroxyapatite coating. The improvement of hydrophilicity for the silver-containing hydroxyapatite coating could be beneficial to the cells proliferation on its surface. It can be concluded that the addition of silver in the hydroxyapatite coating endowed the coating with antibacterial property while maintaining its excellent cytocompatibility.

Motion of Liquid Drops Through Complex 3D Clothing

2009 ◽  
Author(s):  
Hojjat Nasr ◽  
Goodarz Ahmadi ◽  
Homan Tafreshi ◽  
John B. McLaughlin
Keyword(s):  
Contact Angle ◽  
Initial Velocity ◽  
Unstructured Grid ◽  
Water Drop ◽  
Fluid Model ◽  
Navier Stokes ◽  
Angle Distribution ◽  
Navier Stokes Equation ◽  
Liquid Drops ◽  
Volume Of Fluid Model

This study was concerned with the numerical simulation of a moving drop through a fabric due to a wettability gradient. The wettability gradient was introduced by varying the contact angle along the staggered fibers of a fabric. The unsteady laminar Navier-Stokes equation was solved using a fixed Eulerian unstructured grid. The Volume of Fluid Model (VOF) was used to account for tracking the gas/liquid interface. A water drop was placed on top of the fabric with an initial velocity, and the motion of the drop through the fabric was studied. Several computer simulations under different conditions such as the distance between fibers, contact angle distribution, and drop initial velocity were performed, and the results were compared with each other. In order to verify the accuracy of the computational model, the motion of a drop on a surface due to a wettabily gradient was simulated as a benchmark.

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