scholarly journals Electrospun highly corrosion-resistant polystyrene–nickel oxide superhydrophobic nanocomposite coating

2021 ◽  
Author(s):  
A. Bahgat Radwan ◽  
Cheirva A. Mannah ◽  
Mostafa H. Sliem ◽  
Noora Hamad S. Al-Qahtani ◽  
Paul C. Okonkwo ◽  
...  
Keyword(s):  
Contact Angle ◽  
Nickel Oxide ◽  
Contact Angle Hysteresis ◽  
Nanocomposite Coating ◽  
Nanometer Scale ◽  
Water Contact ◽  
Saline Environment ◽  
Corrosion Resistant ◽  
Superhydrophobic Coatings ◽  
Nyquist Plots

AbstractA key challenge in producing superhydrophobic coatings (SHC) is to tailor the surface morphology on the micro-nanometer scale. In this work, a feasible and straightforward route was employed to manufacture polystyrene/nickel oxide (PSN) nanocomposite superhydrophobic coatings on aluminum alloys to mitigate their corrosion in a saline environment. Different techniques were employed to explore the influence of the addition of NiO nanoparticles to the as-prepared coatings. PSN-2 composite with ~ 4.3 wt% of NiO exhibited the highest water contact angle (WCA) of 155° ± 2 and contact angle hysteresis (CAH) of 5°. Graphic abstract EIS Nyquist plots of 3 g of electrospun polystyrene coatings (a) without and with (b) 0.1, (c) 0.15, and (d) 0.2 g of NiO.

Recent advances in corrosion resistant superhydrophobic coatings

2018 ◽  
Vol 36 (2) ◽  
pp. 127-153 ◽  
Author(s):  
Ahmed Bahgat Radwan ◽  
Aboubakr M. Abdullah ◽  
Nasser A. Alnuaimi
Keyword(s):  
Contact Angle ◽  
Surface Energy ◽  
Water Contact Angle ◽  
Metals And Alloys ◽  
Superhydrophobic Surfaces ◽  
Water Repellent ◽  
Water Contact ◽  
Corrosion Resistant ◽  
Superhydrophobic Coatings ◽  
Recent Advances

AbstractExtreme water-repellent (superhydrophobic) coatings with water contact angle higher than 150° have caught the attention of corrosion researchers in the last decade as they can be used to protect metals and alloys against corrosion. The latter is a serious problem, as it can threaten human lives in addition to its deleterious effects on the economy and environment. Superhydrophobic coatings (SHCs) can be achieved by lowering the surface energy of a certain coating through combining some of its surface features at the microscale and nanoscales. Although SHCs can be prepared using many different easy techniques, none, to the best of our knowledge, has been applied, so far, on an industrial scale for protection against corrosion of metals and alloys. The present work explains the different models of superhydrophobic surfaces (SHSs) and reviews their fabrication and processing methods with a focus on the recent advances in the corrosion protection of the SHC.

scholarly journals A Simple Method to Create Superhydrophobic Aluminium Surfaces

2012 ◽  
Vol 706-709 ◽  
pp. 2874-2879 ◽  
Author(s):  
R. Jafari ◽  
Masoud Farzaneh
Keyword(s):  
Contact Angle ◽  
Stearic Acid ◽  
Synergistic Effects ◽  
Low Cost ◽  
Contact Angle Hysteresis ◽  
Spray Coating ◽  
Superhydrophobic Surfaces ◽  
Water Contact ◽  
Simple Method ◽  
Static Contact

Superhydrophobic surfaces were prepared using a very simple and low-cost method by spray coating. A high static water contact angle of about 154° was obtained by deposition of stearic acid on an aluminium alloy. However, this coating demonstrated a high contact angle hysteresis (~ 30º). On the other hand, superhydrophobic surfaces with a static contact angle of about 162º and 158º, and a low contact angle hysteresis of about 3º and 5º were respectively obtained by incorporating nanoparticles of SiO2and CaCO3in stearic acid. The excellent resulting hydrophobicity is attributed to the synergistic effects of micro/nanoroughness and low surface energy. A study of the wettability of these surfaces at temperatures ranging from 20 to-10 °C showed that the superhydrophobic surface becomes rather hydrophobic at supercooled temperatures.

scholarly journals One-Step Preparation of Durable Super-Hydrophobic MSR/SiO2 Coatings by Suspension Air Spraying

Micromachines ◽  
2018 ◽  
Vol 9 (12) ◽  
pp. 677 ◽  
Author(s):  
Zhengyong Huang ◽  
Wenjie Xu ◽  
Yu Wang ◽  
Haohuan Wang ◽  
Ruiqi Zhang ◽  
...  
Keyword(s):  
Contact Angle ◽  
Adhesion Strength ◽  
Contact Angle Hysteresis ◽  
Surface Hardness ◽  
Hierarchical Structures ◽  
Hydrophobic Surface ◽  
Water Contact ◽  
Hydrophobic Coating ◽  
Mechanical Durability ◽  
One Step

In this study, we develop a facial one-step approach to prepare durable super-hydrophobic coatings on glass surfaces. The hydrophobic characteristics, corrosive liquid resistance, and mechanical durability of the super-hydrophobic surface are presented. The as-prepared super-hydrophobic surface exhibits a water contact angle (WCA) of 157.2° and contact angle hysteresis of 2.3°. Mico/nano hierarchical structures and elements of silicon and fluorine is observed on super-hydrophobic surfaces. The adhesion strength and hardness of the surface are determined to be 1st level and 4H, respectively. The coating is, thus, capable of maintaining super-hydrophobic state after sand grinding with a load of 200 g and wear distances of 700 mm. The rough surface retained after severe mechanical abrasion observed by atomic force microscope (AFM) microscopically proves the durable origin of the super-hydrophobic coating. Results demonstrate the feasibility of production of the durable super-hydrophobic coating via enhancing its adhesion strength and surface hardness.

scholarly journals Preparation of Superhydrophobic Steel Surfaces with Chemical Stability and Corrosion

Coatings ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 398 ◽  
Author(s):  
Chongwei Du ◽  
Xiaoyan He ◽  
Feng Tian ◽  
Xiuqin Bai ◽  
Chengqing Yuan
Keyword(s):  
Contact Angle ◽  
Corrosion Resistance ◽  
Carbon Steel ◽  
Chemical Stability ◽  
Superhydrophobic Surface ◽  
Contact Angle Hysteresis ◽  
Water Contact ◽  
Simple Method ◽  
Q235 Carbon Steel ◽  
Steel Surfaces

Corrosion seriously limits the long-term application of Q235 carbon steel. Herein, a simple fabrication method was used to fabricate superhydrophobic surfaces on Q235 carbon steel for anticorrosion application. The combination of structure and the grafted low-surface-energy material contributed to the formation of superhydrophobic steel surfaces, which exhibited a water contact angle of 161.6° and a contact angle hysteresis of 0.8°. Meanwhile, the as-prepared superhydrophobic surface showed repellent toward different solutions with pH ranging from 1 to 14, presenting excellent chemical stability. Moreover, the acid corrosive liquid (HCl solution with pH of 1) maintained sphere-like shape on the as-prepared superhydrophobic surface at room temperature, indicating superior corrosion resistance. This work provides a simple method to fabricate superhydrophobic steel surfaces with chemical stability and corrosion resistance.

scholarly journals Dynamic Wetting on Moving Surfaces: A Molecular Dynamics Study

2012 ◽  
Author(s):  
Konstantinos Ritos ◽  
Nishanth Dongari ◽  
Yonghao Zhang ◽  
Jason M. Reese
Keyword(s):  
Molecular Dynamics ◽  
Contact Angle ◽  
Capillary Number ◽  
Contact Angle Hysteresis ◽  
Hydrophobic Surface ◽  
Md Simulations ◽  
Dynamic Wetting ◽  
Water Contact ◽  
Liquid Flows ◽  
Insight Into

We report molecular dynamics (MD) simulations of the dynamic wetting of nanoscale droplets on moving surfaces. The dynamic water contact angle and contact angle hysteresis are measured as a function of capillary number on smooth silicon and graphite surfaces. The hydrogen bonding and density profile variations are also reported, and the width of the water depletion layer is evaluated for droplets on three different static surfaces: silicon, graphite and a fictitious super-hydrophobic surface. Our results show that molecular displacements at the contact line are mostly influenced by interactions with the solid surface, while the viscous dissipation effects induced through the movement of surfaces are found to be negligible, especially for hydrophobic surfaces. This finding is in contrast with the wetting dynamics of macroscale droplets, which show significant dependence on the capillary number. This study may yield new insight into surface-wettability characteristics of nano droplets, in particular, developing new boundary conditions for continuum solvers for liquid flows in micro- and nanoscale devices.

scholarly journals Ultrahydrophobic Textiles Using Nanoparticles: Lotus Approach

2008 ◽  
Vol 3 (4) ◽  
pp. 155892500800300 ◽  
Author(s):  
Karthik Ramaratnam ◽  
Swaminatha K. Iyer ◽  
Mark K. Kinnan ◽  
George Chumanov ◽  
Phillip J. Brown ◽  
...  
Keyword(s):  
Contact Angle ◽  
Water Contact Angle ◽  
Contact Angle Hysteresis ◽  
Water Repellency ◽  
Textile Material ◽  
Water Repellent ◽  
Complete Wetting ◽  
Water Contact ◽  
Lotus Effect ◽  
Textile Materials

It is well established that the water wettability of materials is governed by both the chemical composition and the geometrical microstructure of the surface.1 Traditional textile wet processing treatments do indeed rely fundamentally upon complete wetting out of a textile structure to achieve satisfactory performance.2 However, the complexities introduced through the heterogeneous nature of the fiber surfaces, the nature of the fiber composition and the actual construction of the textile material create difficulties in attempting to predict the exact wettability of a particular textile material. For many applications the ability of a finished fabric to exhibit water repellency (in other words low wettability) is essential2 and potential applications of highly water repellent textile materials include rainwear, upholstery, protective clothing, sportswear, and automobile interior fabrics. Recent research indicates that such applications may benefit from a new generation of water repellent materials that make use of the “lotus effect” to provide ultrahydrophobic textile materials.3,4 Ultrahydrophobic surfaces are typically termed as the surfaces that show a water contact angle greater than 150°C with very low contact angle hysteresis.4 In the case of textile materials, the level of hydrophobicity is often determined by measuring the static water contact angle only, since it is difficult to measure the contact angle hysteresis on a textile fabric because of the high levels of roughness inherent in textile structures.

Micro-Nanostructured Silicone Rubber Surfaces Using Compression Molding

2018 ◽  
Vol 941 ◽  
pp. 1802-1807 ◽  
Author(s):  
Khosrow Maghsoudi ◽  
Gelareh Momen ◽  
Reza Jafari ◽  
Masoud Farzaneh ◽  
Tony Carreira
Keyword(s):  
Surface Roughness ◽  
Contact Angle ◽  
Silicone Rubber ◽  
Surface Characterization ◽  
Contact Angle Hysteresis ◽  
Compression Molding ◽  
Sliding Angle ◽  
Water Contact ◽  
Superhydrophobic Property ◽  
Aluminum Surfaces

A facile method is introduced for production of micro-nanostructured silicone rubber surfaces by means of direct replication using a compression molding system. The fabricated samples possessing surface roughness display water contact angle of more than 160o and contact angle hysteresis (CAH) and sliding angle of less than 5o. Such low surface wettability of silicone specimens verifies the induced superhydrophobic property. Chemically etched aluminum surfaces could work excellently as templates whose patterns were replicated on the rubber surfaces successfully. Various etching conditions were examined. Surface characterization techniques revealed the presence of micro-nanostructures on the produced silicone surfaces.

Fabrication of a Super-Hydrophobic Micro-Nanoporous Aluminum Surface by Anodic Oxidation

2012 ◽  
Vol 200 ◽  
pp. 190-193 ◽  
Author(s):  
Ruo Mei Wu ◽  
Shu Quan Liang ◽  
Hong Chen ◽  
An Qiang Pan ◽  
Hai Yun Jiang ◽  
...  
Keyword(s):  
Contact Angle ◽  
Stearic Acid ◽  
Contact Angle Hysteresis ◽  
Hydrophobic Surface ◽  
Aluminum Surface ◽  
Anodized Aluminum ◽  
Water Contact ◽  
Static Water ◽  
Superhydrophobic Property ◽  
Device Associated Infection

A novel and stable super-hydrophobic film was prepared by stearic acid (C18H36O2), which was chemically adsorbed onto the anodized aluminum surface. The maximum static water contact angle (WCA) of the super-hydrophobic surface was 157.5º ± 2.0º and the contact angle hysteresis was less than 3º. The superhydrophobic property is attributed to the micro-nanoporous surface morphology and stearic acid. The pore size on the surface of anodic aluminum oxide is an important factor for controlling the superhydrophobic adhesiveness. The superhydrophobic surface is a factor to reduce device-associated infection and can be used in metal packaging practice.

Superhydrophobic Surface Prepared by Organic-Inorganic Hybrid Material on Plasma Spraying Al2O3+13wt. %TiO2 Ceramic Coating

2015 ◽  
Vol 817 ◽  
pp. 76-81 ◽  
Author(s):  
Yu Xiao Mi ◽  
Ze Hua Zhou ◽  
Ze Hua Wang ◽  
Guo Wei Wang ◽  
Juan Yao
Keyword(s):  
Contact Angle ◽  
Plasma Spraying ◽  
Ceramic Coating ◽  
Contact Angle Hysteresis ◽  
Weight Ratio ◽  
Angle Measurement ◽  
Chemical Compositions ◽  
Water Contact ◽  
Inorganic Hybrid ◽  
Film Forming

The plasma spraying Al2O3+13wt. %TiO2 ceramic coating was coated with organic-inorganic hybrid emulsion. The hybrid emulsion prepared through co-hydrolysis and copolycondensation reactions of tetraethoxysilane (TEOS) and methyltriethoxysilane (MTES), and methylsilicone resin was added in the emulsion to improve the film-forming properties. The morphologies, chemical compositions and hydrophobicity of the resulting surfaces were analyzed by scanning electron microscopy (SEM), 3-dimensional stereoscopic microscope, energy dispersive X-ray detector (EDX), Fourier transfer infrared spectrometer (FT-IR) and water contact angle measurement. When the mole ratio of TEOS/MTES and the weight ratio of methylsilicone resin were 1:1 and 3.5wt. %, respectively, this surface displayed good film-forming properties. The contact angle was 130.24°, and the contact angle hysteresis was less than 10°.

Contact Angle Hysteresis at the Nanometer Scale

2011 ◽  
Vol 106 (13) ◽  
Author(s):  
Mathieu Delmas ◽  
Marc Monthioux ◽  
Thierry Ondarçuhu
Keyword(s):  
Contact Angle ◽  
Contact Angle Hysteresis ◽  
Nanometer Scale
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