scholarly journals Statistical Approaching for Superhydrophobic Coating Preparation using Silica Derived from Geothermal Solid Waste

2020 ◽  
Vol 19 (2) ◽  
pp. 91
Author(s):  
S Silviana ◽  
Adi Darmawan ◽  
Agus Subagio ◽  
Febio Dalanta
Keyword(s):  
Contact Angle ◽  
Optimum Condition ◽  
Chloride Concentration ◽  
Superhydrophobic Coating ◽  
Silica Coatings ◽  
Silica Concentration ◽  
Solution Preparation ◽  
Coating Methods ◽  
Silica Treatment ◽  
Superhydrophobic Silica

Material quality can be affected by humidity resulting in short durability. Many observations have been conducted to endure the durability of material, such as coating methods. However, recent methods are unaffordable. Therefore, this paper observes efficient and effective method to prepare superhydrophobic silica coatings derived from geothermal waste. The method was conducted by spraying. The objective of this paper is to observe optimum condition by using variables of silica concentration, TMCS (trimethylsilyl chloride) concentration, solvents and materials confirmed by contact angle of material based on statistical analysis. The study consisted of silica treatment for purification and preparation of superhydrophobic silica coatings. The study was carried out in factorial design of 81 experiments with one-time replication through Design Expert software (version 8.0.6). Based on previous research, the experiment was obtained optimum condition at 5.5 %w/v, 13 %v/v, isooctane, zinc coated for silica concentration, TMCS concentration, solvent and material, respectively, releasing contact angle by instrumentation of 180°. By ANOVA analysis, it was also complied the optimum condition of the superhydrophobic coating solution preparation achieved the same condition with experimental data releasing contact angle of 179.69°.

scholarly journals Photo Initiated Chemical Vapour Deposition To Increase Polymer Hydrophobicity

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Ariane Bérard ◽  
Gregory S. Patience ◽  
Gérald Chouinard ◽  
Jason R. Tavares
Keyword(s):  
Contact Angle ◽  
Chemical Vapour Deposition ◽  
High Density Polyethylene ◽  
Vapour Deposition ◽  
Venturia Inaequalis ◽  
Chemical Vapour ◽  
Superhydrophobic Coating ◽  
Water Ingress ◽  
New Challenges ◽  
Lower Contact

Abstract Apple growers face new challenges to produce organic apples and now many cover orchards with high-density polyethylene (HDPE) nets to exclude insects, rather than spraying insecticides. However, rainwater- associated wetness favours the development of apple scabs, Venturia inaequalis, whose lesions accumulate on the leaves and fruit causing unsightly spots. Treating the nets with a superhydrophobic coating should reduce the amount of water that passes through the net. Here we treat HDPE and polyethylene terephthalate using photo-initiated chemical vapour deposition (PICVD). We placed polymer samples in a quartz tube and passed a mixture of H2 and CO through it while a UVC lamp (254 nm) illuminated the surface. After the treatment, the contact angle between water droplets and the surface increased by an average of 20°. The contact angle of samples placed 70 cm from the entrance of the tube was higher than those at 45 cm and 20 cm. The PICVD-treated HDPE achieved a contact angle of 124°. Nets spray coated with a solvent-based commercial product achieved 180° but water ingress was, surprisingly, higher than that for nets with a lower contact angle.

scholarly journals Fabrication and Evaluation of Nano-TiO2 Superhydrophobic Coating on Asphalt Pavement

Materials ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 211
Author(s):  
Hongfeng Li ◽  
Xiangwen Lin ◽  
Hongguang Wang
Keyword(s):  
Contact Angle ◽  
Stearic Acid ◽  
Asphalt Pavement ◽  
Asphalt Mixture ◽  
Waterborne Polyurethane ◽  
Superhydrophobic Coating ◽  
Nano Tio2 ◽  
Sem Image ◽  
Low Surface Energy ◽  
Water Damage

In order to address water damage of asphalt pavement, reduce the occurrence of water-related potholes, deformation, and other diseases, and improve the performance and service life of the pavement, a nano-TiO2 superhydrophobic coating (PSC) on asphalt pavement was prepared from waterborne polyurethane and nano-TiO2 modified by stearic acid. FT-IR measured stearic acid successfully modified low surface energy substance on the surface of nano-TiO2. The SEM image shows that the PSC has a rough surface structure. The contact angle and rolling angle of the PSC in the contact angle test are 153.5° and 4.7°, respectively. PSC has a super-hydrophobic ability, which can improve the water stability of the asphalt mixture. Although the texture depth and pendulum value have been reduced by 2.5% and 4.4%, respectively, they all comply with the standard requirements. After the abrasion resistance test, the PSC coating still has a certain hydrophobic ability. These results surface PSC coating can effectively reduce water damage on asphalt pavement, and has considerable application value.

Spinning deposition of silica and silica-titania optical coatings: A round robin test

1998 ◽  
Vol 13 (3) ◽  
pp. 731-738 ◽  
Author(s):  
M. Guglielmi ◽  
A. Martucci ◽  
R. M. Almeida ◽  
H. C. Vasconcelos ◽  
E. M. Yeatman ◽  
...  
Keyword(s):  
Refractive Index ◽  
Sol Gel ◽  
Round Robin ◽  
Silicon Substrates ◽  
Round Robin Test ◽  
Silica Coatings ◽  
Deposition Parameters ◽  
Heat Treated ◽  
Solution Preparation ◽  
Titania Coatings

A round robin test has been performed on sol-gel processing for the deposition of silica and silica-titania films on silicon substrates by spin-coating. Three solution preparation processes for silica coatings and three for silica-titania coatings were used to prepare samples at each of the participating laboratories. The films have been characterized mainly by thickness (profilometry and ellipsometry measurements), refractive index, porosity, and optical scattering. Different processes gave different thicknesses. Thickness differences were found in films prepared by the same process and by the same deposition parameters, but in different laboratories, when heat-treated at 500 °C. Variations were reduced in samples annealed at 1000 °C. Refractive index and porosity measurements suggest that variations were due to structural differences, particularly porosity. Furthermore, films heat-treated at 500 °C were not completely stabilized, and showed index and porosity variations after six months.

scholarly journals A Durable PVDF/PFOTES-SiO2 Superhydrophobic Coating on AZ31B Mg Alloy with Enhanced Abrasion Resistance Performance and Anti-Corrosion Properties

2021 ◽  
Vol 11 (23) ◽  
pp. 11172
Author(s):  
Zhiqiang Qian ◽  
Zhong Liu ◽  
Shidong Wang ◽  
XiuShen Ye ◽  
Zhijian Wu
Keyword(s):  
Contact Angle ◽  
Wear Resistance ◽  
Salt Spray ◽  
Mg Alloy ◽  
Superhydrophobic Coating ◽  
Friction Test ◽  
Sliding Angle ◽  
Sio2 Coating ◽  
Corrosion Properties ◽  
Water Contact

A simple and practical spray method is employed to prepare a PVDF/PFOTES-SiO2 superhydrophobic composite coating on the AZ31B Mg alloy substrate. The morphology, composition, and water contact angle (CA) were measured by Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscope (FESEM) and contact angle measuring instrument. Hydrophilic nano-SiO2 is modified by PFOTES to obtain hydrophobicity. The influence of the mass of PFOTES-SiO2 to PVDF on the hydrophobic properties was studied. The wear resistance and stability of the composite coating have been investigated by immersion test, cross-cut adhesion test and friction test. Additionally, the corrosion resistance was measured by electrochemical workstation and salt spray corrosion test. The CA of PVDF/PFOTES-SiO2 coating is 161.3° and the sliding angle (SAs) is less than 2°. After 10× the sandpaper friction test, the superhydrophobic contact angle of the coating remained above 155°, and the sliding angle was less than 5°, which indicated that the prepared coating is a strong superhydrophobic coating with good wear resistance. The results of the electrochemical tests show that the superhydrophobic coating improved the anti-corrosion performance of Mg alloy, and the water contact angle is greater than 150° after 168 h salt spray corrosion test. Due to its excellent superhydrophobicity, wear resistance and anti-corrosion properties, the robust PVDF/PFOTES-SiO2 coating is considered to have great potential for future applications in the automotive and marine industries.

A SUPERHYDROPHOBIC COATING ON TITANIUM ALLOYS BY SIMPLE CHEMICAL ETCHING

2021 ◽  
pp. 2150027
Author(s):  
YUFENG ZHANG ◽  
GUOLIANG CHEN ◽  
YAMING WANG ◽  
YONGCHUN ZOU
Keyword(s):  
Contact Angle ◽  
Titanium Alloy ◽  
Electrochemical Impedance ◽  
Contact Angle Hysteresis ◽  
Manufacturing Strategy ◽  
Superhydrophobic Coating ◽  
Sliding Angle ◽  
The Hierarchical Structure ◽  
Silane Modification ◽  
Self Cleaning

In the present study, a scalable-manufactured and environmental-friendly method was proposed to fabricate the superhydrophobic coating on titanium alloy. The hierarchical binary surface structures were obtained by hydrothermal treatment of titanium alloy with oxalic acid and sodium hydroxide solutions successively. The hierarchical structure surfaces after fluoroalkyl-silane modification possessed a maximum contact angle of 158.7° and a sliding angle of 4.3°. The low contact angle hysteresis surface can lead to efficient self-cleaning performance, which was confirmed by the bounce and roll off of water droplet on the surface. Furthermore, the anticorrosion behaviors of the superhydrophobic coating in 3.5[Formula: see text]wt.% NaCl solution was evaluated by the electrochemical impedance spectroscopy (EIS). It was found that the superhydrophobic coating can maintain its superhydrophobic state (150°) within 48 h, thereby effectively preventing the corrosive medium from penetrating into the coating. This simple yet fast anti-corrosion/self-cleaning superhydrophobic coating manufacturing strategy will enlighten its potential application in the engineering fields.

Transparent Superhydrophobic silica coatings on glass by sol–gel method

2010 ◽  
Vol 257 (2) ◽  
pp. 333-339 ◽  
Author(s):  
Satish A. Mahadik ◽  
Mahendra S. Kavale ◽  
S.K. Mukherjee ◽  
A. Venkateswara Rao
Keyword(s):  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method ◽  
Silica Coatings ◽  
Superhydrophobic Silica

scholarly journals Preparation of Fluoroalkyl-Acrylate-Modified Polysiloxane Nanocomposite and Its Surface Properties as a Superhydrophobic Coating Material

Coatings ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 616
Author(s):  
Fuquan Deng ◽  
Hua Jin ◽  
Wei Xu
Keyword(s):  
Contact Angle ◽  
Surface Composition ◽  
Polymer Surface ◽  
Covalent Bond ◽  
Rolling Contact ◽  
Static Contact Angle ◽  
Infrared Spectrometry ◽  
Superhydrophobic Coating ◽  
Static Contact ◽  
Fabric Surface

Based on the as-synthesized modified polysiloxane containing pendant long-chain fluoroalkyl and silanoxy (PFAS) in our previous work, an in situ condensation reaction with silica sol was carried out to prepare a fluoroacrylate-modified polysiloxane nanocomposite. The polysiloxane nanocomposite was then applied as a fabric finish to construct a superhydrophobic coating. The structural and thermal properties of the polymer, surface morphology, surface composition and hydrophobicity of the fabric coatings, polymer fine microstructure, and performance properties of the treated fabrics were researched using infrared spectrometry, thermogravimetric analysis, scanning electron microscopy, atomic force microscopy, X-ray photoelectron spectrometry, and measurement of the contact angle, whiteness, and softness. The characterization results showed that the product had good thermal stability. The static contact angle and rolling contact angle on the finished fabric surface were 163.5° and 7°, respectively. The whiteness and softness were basically similar to those of untreated fabrics. Moreover, due to the stable covalent bond between the silica particles and the polymers, the static contact angle remained 152.3° after 15 cycles of washing, which indicates that it has good water resistance.

Polystyrene assisted superhydrophobic silica coatings with surface protection and self-cleaning approach

2017 ◽  
Vol 105 ◽  
pp. 235-244 ◽  
Author(s):  
Popat G. Pawar ◽  
Ruimin Xing ◽  
Rahul C. Kambale ◽  
A. Madhan Kumar ◽  
Shanhu Liu ◽  
...  
Keyword(s):  
Surface Protection ◽  
Silica Coatings ◽  
Self Cleaning ◽  
Superhydrophobic Silica

scholarly journals Superhydrophobic Coating Derived from Geothermal Silica to Enhance Material Durability of Bamboo Using Hexadimethylsilazane (HMDS) and Trimethylchlorosilane (TMCS)

Materials ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 530
Author(s):  
Silviana Silviana ◽  
Adi Darmawan ◽  
Febio Dalanta ◽  
Agus Subagio ◽  
Ferry Hermawan ◽  
...  
Keyword(s):  
Superhydrophobic Coating ◽  
Categorical Variable ◽  
Soil Burial Test ◽  
Soil Burial ◽  
Silica Source ◽  
Many Instruments ◽  
Silica Concentration ◽  
Sand Abrasion ◽  
Full Factorial ◽  
Material Durability

Bamboo, a fast-growing plant from Asia, is used as building material with unique properties, while exhibiting fast degradation due to its hydrophobicity. Therefore, many attempts have been implemented using several technologies for bamboo modification to alter the hydrophobicity. Most previous studies producing superhydrophobic properties are conducted by using tetraethoxysilane (TEOS) as a precursor agent. However, this method, using TEOS with harmful properties and unaffordable compounds, requires many steps to accomplish the experimental method. Therefore, this paper employed geothermal solid waste as a silica source of the precursor. Thus, an effective and efficient method was applied to prepare superhydrophobic coating by using a precursor of geothermal silica and further modification using hexamethyldisilazane (HMDS) and trimethylchlorosilane (TMCS). The research was executed by the full factorial statistical method using two numerical variables (HMDS/TMCS concentration and silica concentration) and one categorical variable (solvent types). The uncoated material revealed higher weight gain in mass and moisture content than that of the coated bamboo after the soil burial test to assess the durability of the bamboo. However, the durability of superhydrophobic coating realized hydrophobic performance for both agents during sand abrasion for a total of 120 s at an angle of 45°. Statistical results showed the optimum contact angle (CA) achieved in superhydrophobic performance with lower silica concentration for HMDS concentration and the appropriate solvent of n-hexane for HMDS and iso-octane for TMCS. All results were supported using many instruments of analysis to confirm the step-by-step alteration of geothermal silica to be used as a superhydrophobic coating, such as XRF, XRD, FTIR, SEM, and SEM EDX.

scholarly journals Photopolymerized superhydrophobic hybrid coating enabled by dual-purpose tetrapodal ZnO for liquid/liquid separation

2022 ◽  
Author(s):  
Chenxuan Li ◽  
Brian Lee ◽  
Chenxu Wang ◽  
Aayushi Bajpayee ◽  
Lacey Douglas ◽  
...  
Keyword(s):  
Energy Efficient ◽  
Low Cost ◽  
Liquid Mixtures ◽  
Immiscible Liquid ◽  
Hybrid Coating ◽  
Superhydrophobic Coating ◽  
Stainless Steel Mesh ◽  
Dual Purpose ◽  
Efficient Separation ◽  
Coating Methods

The development of low-cost and scalable superhydrophobic coating methods demands viable approaches for energy-efficient separation of immiscible liquid/liquid mixtures. A scalable photoinitiated method is developed to functionalize stainless-steel mesh with...

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