A NOVEL METHOD TO EVALUATE PLASMA DEPOSITED SILICON OXIDE BARRIER FILMS BY WATER CONTACT ANGLE MEASUREMENT UNDER DC VOLTAGE APPLICATION (FOR CONFERENCE PUBLICATIONS FROM ACCS 2011)

2012 ◽  
Vol 24 (02) ◽  
pp. 165-169
Author(s):  
Ko-Shao Chen ◽  
Chin-Yen Chou ◽  
Shu-Chuan Liao ◽  
Chia-Hui Tsao ◽  
Hsin-Ming Wu
Keyword(s):  
Thin Film ◽  
Contact Angle ◽  
Water Contact Angle ◽  
Plasma Deposition ◽  
Substrate Surface ◽  
Silicon Film ◽  
Angle Measurement ◽  
Silicon Thin Film ◽  
Water Contact ◽  
Organic Silicon

In this study, organic silicon thin film was deposited on a comb type electrode substrate surface using hexamethyldisilazane (HMDSZ) plasma deposition technique to enhance voltage withstanding capability. The wettability, morphology and capability to withstand voltage were investigated by water contact angle (WCA) measurement, SEM observations, AFM and ampere meter analysis, respectively. The WCA of the substrate is 92.3° after the plasma deposition. As voltage is applied to the electrode, the WCA lowers to 76.4° and the resulting current flow is 0.078 mA. If the voltage is continually applied to the device, the organic silicon film on the substrate starts to peel off, accompanied with a sharp increase in current, which is an irreversible phenomenon. From the SEM and AFM analysis, the voltage withstanding capability of the device can be enhanced by prolonging the plasma processing time in order to obtain thicker thin film.

Picoliter Water Contact Angle Measurement on Polymers

Langmuir ◽  
2007 ◽  
Vol 23 (13) ◽  
pp. 6875-6878 ◽  
Author(s):  
Michael Taylor ◽  
Andrew J. Urquhart ◽  
Mischa Zelzer ◽  
Martyn C. Davies ◽  
Morgan R. Alexander
Keyword(s):  
Contact Angle ◽  
Water Contact Angle ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Water Contact ◽  
Water Contact Angle Measurement

The Study of Immobilization Thermal-Sensitive Hydrogel onto ePTFE Film Use the Cold Plasma and Photo-Grafting Technique

2006 ◽  
Vol 15-17 ◽  
pp. 187-192 ◽  
Author(s):  
Ko Shao Chen ◽  
Su Chen Chen ◽  
Yi Chun Yeh ◽  
Wei Cheng Lien ◽  
Hong Ru Lin ◽  
...  
Keyword(s):  
Contact Angle ◽  
Acetic Acid ◽  
Water Contact Angle ◽  
Photoelectron Spectroscopy ◽  
Cold Plasma ◽  
Plasma Deposition ◽  
Plasma Technology ◽  
Water Contact ◽  
X Ray ◽  
Grafting Technique

Expanded polytetrafluoroethylene (ePTFE) is a bioinert material. To improve the ePTFE film biocompatibility, the cold plasma technology was used with acetic acid as monomer to deposit onto ePTFE film and then (N-isopropylacrylamide) was grafted onto the surface by photo-grafting. The characteristics of the surface were evaluated with X-ray photoelectron spectroscopy (XPS), FTIR and water contact angle. It was found that the contact angle of water on the untreated ePTFE significantly decrease from125° to 72° after ePTFE film being treated with acetic acid plasma deposition treatment. Due to the hydrophilicity of poly(N-isopropylacrylamide), the contact angle of water on the ePTFE-g-NIPAAm approached to 0°.

Contact Angle Analysis on Glass Based Surface

2014 ◽  
Vol 680 ◽  
pp. 93-96
Author(s):  
Muhammad Hafiz Ab Aziz ◽  
Zaliman Sauli ◽  
Vithyacharan Retnasamy ◽  
Wan Mokhdzani Wan Norhaimi ◽  
Steven Taniselass ◽  
...  
Keyword(s):  
Contact Angle ◽  
Water Contact Angle ◽  
Hydrophobic Surface ◽  
Soda Lime ◽  
Sample Surface ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Anodic Bonding ◽  
Soda Lime Glass ◽  
Water Contact

This paper reports on the contact angle measurement analysis on a glass based surface for anodic bonding process cleaned by three distinct cleaning processes. The three types of glass based surface used were silica, pyrex, and soda lime glass. The three cleaning solutions tested in this experiment were RCA, piranha and acetone. Water Droplet Test (WDT) was done to analyze the contact angle of micro droplet on sample surface. It can be done by dropping a droplet of water in constant volume at the fixed height and angle. Only RCA process constantly decreases the contact angle value after cleaning. The compilations of data strongly proved that all samples become hydrophilic after RCA cleaning process. The solid surface is considered hydrophilic when water contact angle is smaller than 90°, and hydrophobic profile if the water contact angle is larger than 90°. Samples which undergo piranha and acetone cleaning did not prove any characteristic of hydrophilic or hydrophobic surface after cleaning.

Preparation and Characterization of Plasma-Treated Porous Poly(glycerol sebacate) Scaffolds

2013 ◽  
Vol 747 ◽  
pp. 182-185
Author(s):  
Tharinee Theerathanagorn ◽  
Boonlom Thavornyutikarn ◽  
Wanida Janvikul
Keyword(s):  
Contact Angle ◽  
Water Contact Angle ◽  
Photoelectron Spectroscopy ◽  
Average Molecular Weight ◽  
Sebacic Acid ◽  
Angle Measurement ◽  
Porous Scaffolds ◽  
Hydroxyl Groups ◽  
Condensation Polymerization ◽  
Water Contact

In this study, poly (glycerol sebacate) (PGS) was initially synthesized via condensation polymerization of glycerol and sebacic acid at equimolar ratio (1:1) at 130°C for 24 h. The number average molecular weight (Mn) of the resulting polymer determined by gel permeation chromatography (GPC) was about 2800 g/mol. Porous PGS scaffolds were subsequently prepared by a particle-leaching technique. NaCl was added into the polymer at 60-90% w/w; the mixtures were cured in Teflon molds at 140°C for 16 h. The porous scaffolds were further subjected to surface treatment with low pressure oxygen plasma to increase surface carboxyl and hydroxyl groups and thereby enhance hydrophilicity of PGS scaffold surface. The surface morphology and wettability of both untreated PGS and plasma-treated PGS scaffolds were comparatively determined by scanning electron microscopy (SEM) and water contact angle measurement, respectively. A considerable decrease in water contact angle was observed on the PGS scaffolds after the plasma treatment. The surface chemistry, mechanical strength and degree of swelling of the PGS scaffolds were also assessed by X-ray photoelectron spectroscopy (XPS), dynamic mechanical analysis (DMA) and swelling measurement, respectively.

Fabrication of superhydrophobic cotton fabrics through wrapping silica with plasma-induced grafting polymerization

2017 ◽  
Vol 89 (3) ◽  
pp. 401-410 ◽  
Author(s):  
Yongqiang Li ◽  
Chao Zou ◽  
Jianzhong Shao ◽  
Ya’nan Li
Keyword(s):  
Contact Angle ◽  
Water Contact Angle ◽  
Cotton Fabric ◽  
Photoelectron Spectroscopy ◽  
Contact Angle Measurement ◽  
Cotton Fabrics ◽  
Angle Measurement ◽  
Water Contact ◽  
Washing Durability ◽  
Before And After

Cotton fabric is commonly used in daily life, but it is easily wetted and contaminated by liquid. Herein, we present a simple and environmentally friendly plasma technology for hydrophobic modification of cotton fabric. In order to endow superhydrophobicity to cotton fabric, helium plasma inducing graft polymerization of 1,3,5,7-tetravinyl-1,3,5,7-tetramethylcyclotetrasiloxane (D4Vi) was utilized to wrap SiO2 particles on cotton fabrics. Cotton fabrics were successively dipped in silica sol and D4Vi, then treated by plasma. Cotton fabrics before and after modification were characterized by using field emission scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and water contact angle measurement. The experimental results showed that the cotton-SiO2-D4Vi consisted of nanoscale SiO2 protrusions and low-surface-energy film polymerized by D4Vi. In addition, the one wrapped SiO2 of 161 nm presented excellent hydrophobicity, washing durability, and repellency toward different types of liquids with a water contact angle of 152°.

Hydrophilic Silica Thin Film Formed Using Dimethyl Silicone Oil and Ozone

2014 ◽  
Vol 893 ◽  
pp. 524-527
Author(s):  
Hiroyuki Arima ◽  
Takuya Ito ◽  
Kensuke Nishioka
Keyword(s):  
Thin Film ◽  
Contact Angle ◽  
Water Contact Angle ◽  
Silicone Oil ◽  
Solar Panels ◽  
Water Contact ◽  
Glass Substrates ◽  
Different Temperatures ◽  
Silica Thin Film ◽  
Dimethyl Silicone

In order to fabricate the SiO2 thin film using dimethyl silicone oil and ozone on protective covering glass for solar panels, the hydrophilicity and the transmittance of the film was investigated. We fabricated the film at different temperatures of 150°C, 175°C, 200°C, 225°C and 250°C on the glass substrates. The hydrophilicity of the film fabricated at 150°C showed very good hydrophilicity (water contact angle: ~8°), and transmittance was improved compared to the non-coated glass.

scholarly journals Preparation and Characterization of a Hydrophilic Polysulfone Membrane Using Graphene Oxide

2019 ◽  
Vol 2019 ◽  
pp. 1-10 ◽  
Author(s):  
Hoan Thi Vuong Nguyen ◽  
Thu Hong Anh Ngo ◽  
Khai Dinh Do ◽  
Minh Ngoc Nguyen ◽  
Nu Thi To Dang ◽  
...  
Keyword(s):  
Contact Angle ◽  
Graphene Oxide ◽  
Water Contact Angle ◽  
Water Flux ◽  
Feed Solution ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Inversion Method ◽  
Water Contact ◽  
Polysulfone Membrane

In general, the polysulfone (PSf) membranes are popular choices for water treatment because they have high thermal stability and good chemical resistance. On the other hand, the filtration capacity of the polysulfone membrane is limited because of its low water flux and poor antifouling ability, which are caused by the low surface hydrophilicity of the membranes. In this research, blending of graphene oxide (GO) or graphene oxide-titanium dioxide (GO-TiO2) mixture into the polysulfone matrix had been carried out through the phase inversion method to enhance the hydrophilic and antifouling properties. Methods such as energy-dispersive X-ray spectroscopy, scanning electron microscopy, Fourier transform infrared spectroscopy, and water contact angle measurement were used to examine the surface properties of the prepared membranes. Experimental results have led to a conclusion that graphene oxide can be stabilized into prepared membranes, and then, by reducing the water contact angle values, the surface of these membranes becomes hydrophilic, which increases the permeability and the water flux of methylene blue from the aqueous feed solution, improving the membrane’s antifouling resistance.

Fabrication of Stable Superhydrophobic Surface with Low Adhesion on Aluminum Foil

2014 ◽  
Vol 697 ◽  
pp. 80-84
Author(s):  
Yong Mei Xia ◽  
You Fa Zhang ◽  
Xin Quan Yu ◽  
Feng Chen
Keyword(s):  
Contact Angle ◽  
Water Contact Angle ◽  
Superhydrophobic Surface ◽  
Research Work ◽  
Aluminum Foil ◽  
Industrial Applications ◽  
Angle Measurement ◽  
Aluminum Surface ◽  
Chemical Compositions ◽  
Water Contact

Metal aluminum surface can be corroded easily in acid and alkaline environment. Inspired by the self-cleaning lotus leaf, the development of superhydrophobic metal surfaces to prevent metals from corroding is enjoying tremendous popularity amongst scientists and engineers. In this work, superhydrophobic surface was obtained on aluminum foils via a facile neutral sol solution immersion process and post-modification in ethanol solution of heptadecafluoro-1,1,2,2-tetradecyl trimethoxysilane (FAS-17) solution through a hydrothermal synthesis technique. Scanning electron microscopy (SEM), X-ray diffraction (XRD) and water contact angle measurement are used to investigate the morphologies, microstructures, chemical compositions and wettability of the produced films on aluminum substrates. The results indicated that the superhydrophobic surface, configured of a rough labyrinth structure with convexity and notch, has robust hydrophobility, which had a static water contact angle of 165.6 ± 2.8° and a water roll-off angle of <1°, exhibited long-term durability and stability in air. The present research work provides a new strategy for the simple preparation superhydrophobic films on aluminum foil for practical industrial applications.

Copper to Copper Direct Bonding Assisted by Self-Assembled Monolayer

2010 ◽  
Author(s):  
D. F. Lim ◽  
X. F. Ang ◽  
J. Wei ◽  
C. M. Ng ◽  
C. S. Tan
Keyword(s):  
Contact Angle ◽  
Water Contact Angle ◽  
Bonding Temperature ◽  
Contact Angle Measurement ◽  
Copper Surface ◽  
Angle Measurement ◽  
Self Assembled Monolayer ◽  
Water Contact ◽  
Water Contact Angle Measurement ◽  
Self Assembled

In this article, a self-assembled monolayer (SAM) is applied onto the copper surface in an attempt to lower the required bonding temperature. Alkane-thiol with 6-carbon chain length is used and tested for bonding experiment. The adsorption of SAM is confirmed by the sharp rise of the water contact angle measurement and the reduced in the surface roughness. Next, the desorption of SAM is done at a high temperature anneal (<300°C) in an inert ambient and its properties are characterized by the water contact angle measurement and XPS. It is found that the water contact angle measurement decreases sharply close back to the contact angle of the pure blanket copper surface after annealing of SAM. The XPS results also show the ability of SAM in protecting Copper surface from oxidation. Finally, shear test is performed on Cu-Cu structures bonded at low temperature (250°C) in order to verify the SAM behavior in protecting the copper surface from oxidation and enhancement for bonding. The wafer pairs with and without SAM are intentionally exposed in clean room environment for few days. The bonded pieces are diced and subject to shear stress and results show that with SAM protection, shear strength is improved due to the enhancement in grain growth as a result of cleaner surface.

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