Adsorption of plasma proteins on hydrophobic surfaces. IV. Contact angle studies on implanted polymers

1980 ◽  
Vol 14 (1) ◽  
pp. 1-10 ◽  
Author(s):  
R. D. Bagnall ◽  
J. A. D. Annis ◽  
S. J. Sherliker
Keyword(s):  
Contact Angle ◽  
Plasma Proteins ◽  
Hydrophobic Surfaces

Preparation of Super Hydrophobic Surfaces by the Stainless Steel Wire Mesh as Templates

2012 ◽  
Vol 562-564 ◽  
pp. 56-59 ◽  
Author(s):  
Jian Zhuang ◽  
Meng Meng Du ◽  
Heng Zhi Cai ◽  
Ya Jun Zhang ◽  
Da Ming Wu
Keyword(s):  
Contact Angle ◽  
Stainless Steel ◽  
Steel Wire ◽  
Contact Angles ◽  
Wire Mesh ◽  
Stainless Steel Wire ◽  
Hydrophobic Surfaces ◽  
Water Contact ◽  
Stainless Steel Wire Mesh ◽  
Steel Wire Mesh

A facile method for manufacturing super hydrophobic surfaces is presented using the stainless steel wire mesh as templates. The rough surfaces of polymers including polycarbonate, polypropylene and PMMA are prepared with hot embossing on different specifications of stainless steel wire mesh. Scanning electron microscopy (SEM) results reveal that the surfaces roughness of the polymers can be controlled by selecting templates. Contact angle measurement shows that the water contact angles(WCA) rise with the increase of surface roughness, especially, the water contact angle on the PC surfaces prepared with specifications of 635mesh screen can reach to 152.3°, alias super hydrophobic surfaces.

scholarly journals Wettability on Different Surfaces

2020 ◽  
Author(s):  
Yeeli Kelvii Kwok
Keyword(s):  
Contact Angle ◽  
Textured Surface ◽  
Original Material ◽  
Textured Surfaces ◽  
Hydrophobic Surfaces ◽  
Hydrophilic Surfaces ◽  
Young's Equation

Wettability has been explored for 100 years since it is described by Young’s equation in 1805. It is all known that hydrophilicity means contact angle (θ), θ < 90°; hydrophobicity means contact angle (θ), θ > 90°. The utilization of both hydrophilic surfaces and hydrophobic surfaces has also been achieved in both academic and practical perspectives. In order to understand the wettability of a droplet distributed on the textured surfaces, the relevant models are reviewed along with understanding the formation of contact angle and how it is affected by the roughness of the textured surface aiming to obtain the required surface without considering whether the original material is hydrophilic or hydrophobic.

Adsorption and Diffusion of Plasma Proteins on Hydrophilic and Hydrophobic Surfaces: Effect of Trifluoroethanol on Protein Structure

Langmuir ◽  
2009 ◽  
Vol 25 (17) ◽  
pp. 9879-9886 ◽  
Author(s):  
Euridice P. Vieira ◽  
Sandra Rocha ◽  
M. Carmo Pereira ◽  
Helmuth Möhwald ◽  
Manuel A. N. Coelho
Keyword(s):  
Protein Structure ◽  
Plasma Proteins ◽  
Hydrophobic Surfaces ◽  
And Diffusion ◽  
Hydrophilic And Hydrophobic Surfaces

scholarly journals Stretchable Hydrophobic Surfaces and Self-Cleaning Applications

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Bekir Sami Yilbas ◽  
Ghassan Hassan ◽  
Hussain Al-Qahtani ◽  
Naser Al-Aqeeli ◽  
Abdullah Al-Sharafi ◽  
...  
Keyword(s):  
Contact Angle ◽  
Water Droplet ◽  
Dust Removal ◽  
Dust Particles ◽  
Mass Ratio ◽  
Water Droplets ◽  
Surface Wetting ◽  
Hydrophobic Surfaces ◽  
Removal Mechanisms ◽  
Nano Size

Abstract Hydrophobizing of stretchable elastomer surfaces is considered and the reversible behavior of the resulting surface wetting state is examined after stretching and relaxing the hydrophobized samples. The environmental dust are analyzed in terms of elemental constitutes and size, and the dust pinning on the hydrophobized surface is measured. The dust removal mechanisms, by the water droplets on the hydrophobized surface, are investigated. We demonstrated that deposition of functionalized nano-size silica units on the elastomer surface gives rise to hydrophobicity with 135° ± 3° contact angle and low hysteresis of 3° ± 1°. Stretching hydrophobized elastomer surface by 50% (length) reduces the contact angle to 122° ± 3° and enhances the hysteresis to 6° ± 1°. However, relaxing the stretched sample causes exchanging surface wetting state reversibly. Water droplet rolling and sliding can clean the dusty hydrophobized surface almost 95% (mass ratio of the dust particles removed). Droplet puddling causes striations like structures along the droplet path and close examination of the few residues of the dust reveals that the droplet takes away considerably large amount of dust from surface.

Improved Hydrophobicity of Silicon Dioxide Integrated Zinc-Tellurite Glass Surface

2017 ◽  
Vol 268 ◽  
pp. 87-91
Author(s):  
Syarinie Azmi ◽  
Ramli Arifin ◽  
Sib Krishna Ghoshal
Keyword(s):  
Surface Roughness ◽  
Contact Angle ◽  
Surface Energy ◽  
Water Contact Angle ◽  
Glass Surface ◽  
Tellurite Glass ◽  
Hydrophobic Surfaces ◽  
Water Contact ◽  
Host Matrix ◽  
The Impact

Economically viable and maintenance free glass surfaces with improved hydrophobicity are highly demanding in the recent nanotechnology era. Deposition of pollutants and dirt on glass surface that not only causes visual obscurity but also damages the cultural heritages are still to be researched intensely. It is documented that excellent hydrophobic surfaces (with contact angle greater than 90o) can be achieved by controlling the surface wettability, where liquid droplets remain spherical on such surfaces. Selection of materials and the preparation method play a significant role towards such accomplishments. Stirred by this idea, we explored the feasibility of fabricating super-hydrophobic tellurite glass systems by facilely varying the compositions of different constituents. Highly transparent and thermally stable ternary tellurite glass system with chemical composition of (80-x)TeO2 – xSiO2 – 20ZnO, where x = 0.00 to 0.20 mol% are synthesized via conventional melt-quenching method. Samples are characterized using Atomic Force Microscopy (AFM) and contact angle measurements. The impact of SiO2 concentrations variation on the surface roughness, surface energy, and hydrophobic properties are inspected. Glass surface roughness as much as 9.885 nm is attained. The optimal value of water contact angle is discerned to be 101.02° for 0.1 mol% of SiO2 incorporation into the amorphous tellurite host matrix. Besides, the surface energy revealed an inverse proportionality to the water contact angle. This achieved contact angle (greater than 90°) makes this hydrophobic glass surface beneficial for diverse applications. It is established that the present glass composition may be prospective for the development of super-hydrophobic surfaces.

Fabrication of Superhydrophobic Surface with Curved Grooves Using High Power Diode Laser

2021 ◽  
Vol 21 (9) ◽  
pp. 4968-4973
Author(s):  
Mu-Yeon Jang ◽  
Chan-Jung Kim ◽  
Jeong-Woo Park ◽  
Seung-Yub Baek ◽  
Tae-Wan Kim
Keyword(s):  
Contact Angle ◽  
Diode Laser ◽  
High Power ◽  
Femtosecond Lasers ◽  
Hierarchical Structures ◽  
Spherical Shape ◽  
Surface Pattern ◽  
Curvature Radius ◽  
Hydrophobic Surfaces ◽  
Low Efficiency

Most studies on hydrophobic surfaces processed by lasers rely on the use of pico- or femtosecond lasers. However, in industrial application, the fabrication methods using pico- or femtosecond lasers have the disadvantages of high cost and low efficiency In this study, we tried to fabricate hydrophobic surfaces using a high-power general-purpose diode laser. We have fabricated various micro/nano hierarchical structures for aluminum (Al5052) surface using laser groove processing technology. The surface of laser ablated micro structure is decorated with nano roughness, resulting in micro/nano hierarchical structure. Specimen with curved grooves are fabricated, and the correlation of wettability characteristics with spaces, widths, and curvature radii of grooves are presented. It was found that the higher contact angle was formed with a decrease of the curvature radius. We have also fabricated specimens with various micro-wavy surface pattern. The water droplets on the micro-wavy pattern kept the spherical shape with a high contact angle of 165 degrees or more.

Anti-Icing Property of the Prepared Super-Hydrophobic Octadecyltrichlorosilane (OTS) Film by Phase Separation Method

2013 ◽  
Vol 663 ◽  
pp. 331-334
Author(s):  
Liang Ge ◽  
Jin Yuan Yao ◽  
Hong Wang ◽  
Gui Fu Ding
Keyword(s):  
Contact Angle ◽  
Phase Separation ◽  
Heterogeneous Nucleation ◽  
Hydrophobic Surface ◽  
Separation Method ◽  
Surface Wettability ◽  
Nucleation Theory ◽  
Ice Formation ◽  
Water Droplets ◽  
Hydrophobic Surfaces

In this paper, we prepared an octadecyltrichlorosilane(OTS) super-hydrophobic film using phase separation method to demonstrate the anti-icing property of super-hydrophobic surfaces. We investigated the super-hydrophobicity of the surface in -5°C environment, as well as the icing process of water droplets on the surface which proceeded at the temperature low to -15°C. We found that the prepared OTS film retained its super-hydrophobicity in the -5°C environment by the measurement of contact angle. It was observed that the icing progress of water droplets on the super-hydrophobic surface was greatly retarded. Based on the classical heterogeneous nucleation theory, it concluded that the ice formation is directly related to the surface wettability. This research would be beneficial to the preparation of anti-icing films.

Sign in / Sign up

Export Citation Format

Share Document