scholarly journals Superhydrophobic Al2O3–Polymer Composite Coating for Self-Cleaning Applications

Coatings ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1162
Author(s):  
Rajaram S. Sutar ◽  
Saravanan Nagappan ◽  
Appasaheb K. Bhosale ◽  
Kishor Kumar Sadasivuni ◽  
Kang-Hyun Park ◽  
...  
Keyword(s):  
Composite Coating ◽  
Research Work ◽  
Water Repellency ◽  
Dip Coating ◽  
Industrial Applications ◽  
Water Repellent ◽  
Al2o3 Nanoparticles ◽  
Sliding Angle ◽  
Water Contact ◽  
Self Cleaning

Superhydrophobic coatings have a huge impact in various applications due to their extreme water-repellent properties. The main novelty of the current research work lies in the development of cheap, stable, superhydrophobic and self-cleaning coatings with extreme water-repellency. In this work, a composite of hydrothermally synthesized alumina (Al2O3), polymethylhydrosiloxane (PMHS) and polystyrene (PS) was deposited on a glass surface by a dip-coating technique. The Al2O3 nanoparticles form a rough structure, and low-surface-energy PHMS enhances the water-repellent properties. The composite coating revealed a water contact angle (WCA) of 171 ± 2° and a sliding angle (SA) of 3°. In the chemical analysis, Al2p, Si2p, O1s, and C1s elements were detected in the XPS survey. The prepared coating showed a self-cleaning property through the rolling action of water drops. Such a type of coating could have various industrial applications in the future.

scholarly journals Fabrication of Mechanically Stable Superhydrophobic Aluminium Surface with Excellent Self-Cleaning and Anti-Fogging Properties

2017 ◽  
Author(s):  
Priya Varshney ◽  
Soumya Mohapatra ◽  
Aditya Kumar
Keyword(s):  
High Speed ◽  
Materials Science ◽  
Industrial Applications ◽  
Aluminum Surface ◽  
Water Repellent ◽  
Adhesive Tape ◽  
Sliding Angle ◽  
Etching Technique ◽  
Water Contact ◽  
Self Cleaning

Development of the self-cleaning and anti-fogging superhydrophobic coating for aluminum surfaces which is durable in the aggressive conditions has raised tremendous interest in materials science. In this work, by employing chemical etching technique with mixture of hydrochloric and nitric acid, followed by passivation with lauric acid, superhydrophobic aluminum surface was synthesized. The surface morphology analysis reveals the presence of rough microstructures on coated aluminium surface. Superhydrophobicity with water contact angle of 170 ± 3.9° and sliding angle of 4 ± 0.5° is achieved. Surface bounces off the high speed water jet, indicating excellent water-repellent nature of coating. It is also continuously floated on water surface for several weeks, showing excellent buoyancy nature. Additionally, coating maintains its superhydrophobicity after undergoing 100 cycles of adhesive tape peeling test. Its superhydrophobic nature withstands 90° and 180° bending, and repeated folding and de-folding. Coating exhibits the excellent self-cleaning property. In low temperature condensation test, almost no accumulation of water drops on the surface, showing the excellent anti-fogging property of coating. This approach can be applied to any size and shape of aluminium surface and hence has great industrial applications.

Study on self-cleaning performance and hydrophobicity of TiO2/silane coatings

2018 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
A. Syafiq ◽  
A.K. Pandey ◽  
Vengadaesvaran Balakrishnan ◽  
Nasrudin Abd Rahim
Keyword(s):  
Glass Substrate ◽  
Substrate Surface ◽  
Phase Interface ◽  
Dip Coating ◽  
Vacuum Furnace ◽  
Coating Film ◽  
Sliding Angle ◽  
Water Contact ◽  
Content Type ◽  
Self Cleaning

PurposeThe paper aims to investigate the effect of Degussa P-25 Titanium Dioxide (TiO2) nanoparticles on hydrophobicity and self-cleaning ability as a single organic coating on glass substrate.Design/methodology/approachTwo methods have been used to enhance the hydrophobicity on glass substrates, namely, surface modification by using low surface energy isooctyltrimethoxysilane (ITMS) solution and construction of rough surface morphology using Degussa P-25 TiO2nanoparticles with simple bottom-up approach. The prepared sol was applied onto glass substrate using dip-coating technique and stoved in the vacuum furnace 350°C.FindingsThe ITMS coating with nano TiO2pigment has modified the glass substrate surface by achieving the water contact angle as high as 169° ± 2° and low sliding angle of 0° with simple and low-cost operation. The solid and air phase interface has created excellent anti-dirt and self-cleaning properties against dilute ketchup solution, mud and silicon powder.Research limitations/implicationsFindings will be useful in the development of self-cleaning and anti-dirt coating for photovoltaic panels.Practical implicationsSol method provides the suitable medium for the combination of organic–inorganic network to achieve high superhydrophobicity and optimum self-cleaning ability.Originality/valueApplication of blended organic–inorganic sol as self-cleaning and anti-dirt coating film.

scholarly journals Preparation and Self-Cleaning Performance of Carbon-Based Superhydrophobic Coatings Based on Non-Fluorine and Non-Toxic Corn Straw

Molecules ◽  
2021 ◽  
Vol 26 (21) ◽  
pp. 6401
Author(s):  
Yanbin Wang ◽  
Lihui Kang ◽  
Zhaoxia Li ◽  
Qiong Su ◽  
Shaofeng Pang ◽  
...  
Keyword(s):  
Hierarchical Structures ◽  
Dip Coating ◽  
Industrial Applications ◽  
Raw Material ◽  
Corn Straw ◽  
Water Contact ◽  
Carbon Particles ◽  
Cleaning Performance ◽  
Superhydrophobic Coatings ◽  
Self Cleaning

Recently, superhydrophobic surfaces with self-cleaning ability have attracted broad research interest due to their huge potential in daily lives and industrial applications, but the use of fluorinate, toxic organic compounds, and expensive feedstocks make superhydrophobic materials a great challenge in practical application. In this study, we present a facile dip-coating strategy to prepare superhydrophobic coatings with self-cleaning properties based on a non-fluorine and non-toxic system by using eco-friendly corn straw as raw material. During this process, aromatic carbon particles with rough hierarchical structures were prepared firstly via a simple fast pyrolysis process, followed by modification with polydimethylsiloxane (PDMS) in absolute ethanol solvent to decrease the surface free energy. Research shows these natural straw-derived carbons display a microstructure of several protrusions which is similar to the lotus leave’s and the resulted coatings exhibit an outstanding superhydrophobic property with a static water contact angle (WCA) of 151.67 ± 1.36 degrees. In addition, the as-prepared coatings possessed excellent self-cleaning performance: no contaminations were observed on the surfaces after examining with sludge, calcimine, water, and common liquids such as tea, milk, soybean milk as well as ink, which have a broad range of potential application in the field of antifouling, waterproofing, and anticorrosive.

scholarly journals Fabrication and characterization of superhydrophobic coatings on cotton fabrics using silica nanoparticles for self-cleaning applications

2020 ◽  
Vol 8 (3) ◽  
pp. 032-039
Author(s):  
Kanwal Zakir ◽  
Syeda Saniya Maham Shahzadi ◽  
Shafqat Rasool ◽  
Zakia Kanwal ◽  
Saira Riaz ◽  
...  
Keyword(s):  
Contact Angle ◽  
Silica Nanoparticles ◽  
Dip Coating ◽  
Contact Angle Measurement ◽  
Cotton Fabrics ◽  
Angle Measurement ◽  
Sliding Angle ◽  
Water Contact ◽  
Coating Method ◽  
Self Cleaning

The marvelous self-cleaning properties of lotus leaves and their superhydrophobic nature inspire the researchers to mimic such functionalities on cotton fabrics. The present work aimed to prepare and characterize true non-sticky superhydrophobic properties on cotton samples. The required combination of micro and nanostructure roughness was achieved by depositing the silica nanoparticles (SiNPs) on cotton surfaces by dip-coating method. To enhance adhesion and durability of silica particles with cotton, SiNPs were functionalized with 3-Aminopropyltriethoxysilane (APTES) before deposition. The surface energy of SiNPs coated cotton samples was lowered by functionalizing with 1H, 1H, 2H, 2H-Perfluorooctyltriethoxysilane (PFOTS). The morphology, surface chemistry and wettability characterizations of prepared samples were performed by scanning electron microscope (SEM), energy dispersive X-ray analysis (EDX) and contact angle measurement system (goniometer) respectively. SEM micrographs revealed the nice decoration of SiNPs (having particles size range 90-150 nm) on the cotton fibers leaving to the hierarchical roughness. The EDX analysis confirmed the coatings of SiNPs and PFOTS. Contact angle measurements exhibited the superhydrophobic nature of prepared surfaces by static water contact angle of 157±2° and sliding angle of less than 5. The functionalized SiNPs/PFOTS cotton fabrics can effectively be used for self-cleaning applications.

scholarly journals Fabrication of superhydrophobic composite coating based on fluorosilicone resin and silica nanoparticles

2018 ◽  
Vol 5 (7) ◽  
pp. 180598 ◽  
Author(s):  
Xiaoming Wang ◽  
Xingeng Li ◽  
Qingquan Lei ◽  
Yaping Wu ◽  
Wenjing Li
Keyword(s):  
Silica Nanoparticles ◽  
Composite Coating ◽  
Room Temperature ◽  
Silica Content ◽  
Superhydrophobic Coating ◽  
Polymer Model ◽  
Modified Silica ◽  
Sliding Angle ◽  
Water Contact ◽  
Modified Silica Nanoparticles

Composite superhydrophobic coating built with film former and filler is attracting much attention for its facile and convenient fabrication, but significant limitations and disadvantages still remain. In this paper, a composite superhydrophobic coating is introduced which can be cured at room temperature and made by dispersing modified silica nanoparticles with 1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane in fluorosilicone resin. Silica content and dispersion time showed obvious influences on the morphology and topography of composite coating by reuniting dispersed nanoparticles to form peaks on the surface. Excessively large distances between these peaks would decrease water contact angle value. Increasing slope of peaks, appropriate distance between peaks and decreasing diameter size of peaks would diminish sliding angle value. Formation mechanism of the composite coating based on fluorosilicone resin and modified nanoparticles was explained using interpenetrating polymer model.

scholarly journals Superhydrophobic Self-Assembled Silane Monolayers on Hierarchical 6082 Aluminum Alloy for Anti-Corrosion Applications

2020 ◽  
Vol 10 (8) ◽  
pp. 2656 ◽  
Author(s):  
Amani Khaskhoussi ◽  
Luigi Calabrese ◽  
Edoardo Proverbio
Keyword(s):  
Aluminum Alloy ◽  
Surface Energy ◽  
High Water ◽  
Dip Coating ◽  
Aluminum Surface ◽  
Sliding Angle ◽  
Water Contact ◽  
Electrochemical Tests ◽  
Self Assembled ◽  
6082 Aluminum Alloy

In this work, a two-stage methodology to design super-hydrophobic surfaces was proposed. The first step consists of creating a rough nano/micro-structure and the second step consists of reducing the surface energy using octadecyltrimethoxysilane. The surface roughening was realized by three different short-term pretreatments: (i) Boiling water, (ii) HNO3/HCl etching, or (iii) HF/HCl etching. Then, the surface energy was reduced by dip-coating in diluted solution of octadecyltrimethoxysilane to allow the formation of self-assembled silane monolayers on a 6082-T6 aluminum alloy surface. Super-hydrophobic aluminum surfaces were investigated by SEM-EDS, FTIR, profilometry, and contact and sliding angles measurements. The resulting surface morphologies by the three approaches were structured by a dual hierarchical nano/micro-roughness. The surface wettability varied with the applied roughening pretreatment. In particular, an extremely high water contact angle (around 180°) and low sliding angle (0°) were evidenced for the HF/HCl-etched silanized surface. The results of electrochemical tests demonstrate a remarkable enhancement of the aluminum alloy corrosion resistance through the proposed superhydrophobic surface modifications. Thus, the obtained results evidenced that the anti-wetting behavior of the aluminum surface can be optimized by coupling an appropriate roughening pretreatment with a self-assembled silane monolayer deposition (to reduce surface energy) for anticorrosion application.

scholarly journals Bio-Inspired Fluorine-Free Self-Cleaning Polymer Coatings

Coatings ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 436 ◽  
Author(s):  
Lionel Wasser ◽  
Sara Dalle Vacche ◽  
Feyza Karasu ◽  
Luca Müller ◽  
Micaela Castellino ◽  
...  
Keyword(s):  
Self Assembly ◽  
Polymer Coatings ◽  
Sliding Angle ◽  
Water Contact ◽  
Uv Curable ◽  
Molecular Weights ◽  
Air Interface ◽  
Creep Time ◽  
Self Cleaning ◽  
Printing Processes

Bio-inspired fluorine-free and self-cleaning polymer coatings were developed using a combination of self-assembly and UV-printing processes. Nasturtium and lotus leaves were selected as natural template surfaces. A UV-curable acrylate oligomer and three acrylated siloxane comonomers with different molecular weights were used. The spontaneous migration of the comonomers towards the polymer–air interface was found to be faster for comonomers with higher molecular weight, and enabled to create hydrophobic surfaces with a water contact angle (WCA) of 105°. The replication fidelity was limited for the nasturtium surface, due to a lack of replication of the sub-micron features. It was accurate for the lotus leaf surface whose hierarchical texture, comprising micropapillae and sub-micron crystalloids, was well reproduced in the acrylate/comonomer material. The WCA of synthetic replica of lotus increased from 144° to 152° with increasing creep time under pressure to 5 min prior to polymerization. In spite of a water sliding angle above 10°, the synthetic lotus surface was self-cleaning with water droplets when contaminated with hydrophobic pepper particles, provided that the droplets had some kinetic energy.

scholarly journals A Durable and Self-Cleaning Superhydrophobic Surface Prepared by Precipitating Flower-Like Crystals on a Glass-Ceramic Surface

Materials ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1642
Author(s):  
Haiqing Fu ◽  
Shuo Liu ◽  
Lanlin Yi ◽  
Hong Jiang ◽  
Changjiu Li ◽  
...  
Keyword(s):  
Glass Ceramic ◽  
Superhydrophobic Surface ◽  
Three Dimensional ◽  
Strong Acid ◽  
Ceramic Surface ◽  
Sliding Angle ◽  
Water Contact ◽  
Prepared Glass ◽  
Self Cleaning ◽  
Dual Scale

Herein, a superhydrophobic surface with superior durability was fabricated on a glass-ceramic surface by crystallization, hydrofluoric acid (HF) etching, and surface grafting. The as-prepared glass-ceramic surface was composed of three-dimensional flower-like micro-clusters, which were self-assembled from numerous nanosheets. Such a dual-scale rough surface exhibited superhydrophobicity, with a water contact angle (WCA) of 170.3° ± 0.1° and a sliding angle (SA) of ~2° after grafting with 1H, 1H, 2H, 2H-perfluorodecyltriethoxysilane (FAS-17). This can be attributed to the synergistic effect between the dual-scale structure and surface chemistry. Furthermore, this surface exhibited excellent self-cleaning properties, stability against strong acid and strong alkali corrosion, and anti-stripping properties.

scholarly journals Superhydrophobic Surface with Gamma Irradiation Resistance and Self-Cleaning Effect in Air and Oil

Coatings ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 106 ◽  
Author(s):  
Yan Zhang ◽  
Jing Zhang ◽  
Yujian Liu
Keyword(s):  
Superhydrophobic Surface ◽  
Water Repellency ◽  
Sio2 Nanoparticles ◽  
Superior Performance ◽  
Sliding Angle ◽  
Water Contact ◽  
Composite Surface ◽  
Static Water Contact Angle ◽  
Static Water ◽  
Dirt Removal

A superhydrophobic surface was synthesized by a combination of an epoxy/polymethylphenylsiloxane matrix and dual-scale morphology of silica (SiO2) nanoparticles. When the amount of SiO2 reached 30 wt.%, the as-prepared surface showed a high static water contact angle (WCA) of 154° and a low sliding angle (SA) of 5°, excellent water repellency, and dirt-removal effects both in air and oil (hexamethylene). Even after exposure to as high as a 12.30 Mrad dose of gamma-rays, the composite surface still maintained its superior performance.

scholarly journals Progress in Sol-Gel Technology for the Coatings of Fabrics

Materials ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 1838 ◽  
Author(s):  
Aravin Prince Periyasamy ◽  
Mohanapriya Venkataraman ◽  
Dana Kremenakova ◽  
Jiri Militky ◽  
Yan Zhou
Keyword(s):  
Flame Retardant ◽  
Sol Gel ◽  
Dip Coating ◽  
Uv Protection ◽  
Water Repellent ◽  
Water Separation ◽  
Factors Affecting ◽  
Wrinkle Resistance ◽  
Color Changes ◽  
Self Cleaning

The commercial availability of inorganic/organic precursors for sol-gel formulations is very high and increases day by day. In textile applications, the precursor-synthesized sol-gels along with functional chemicals can be deposited onto textile fabrics in one step by rolling, padding, dip-coating, spraying or spin coating. By using this technology, it is possible to provide fabrics with functional/multi-functional characteristics including flame retardant, anti-mosquito, water- repellent, oil-repellent, anti-bacterial, anti-wrinkle, ultraviolet (UV) protection and self-cleaning properties. These surface properties are discussed, describing the history, basic chemistry, factors affecting the sol-gel synthesis, progress in sol-gel technology along with various parameters controlling sol-gel technology. Additionally, this review deals with the recent progress of sol-gel technology in textiles in addressing fabric finishing, water repellent textiles, oil/water separation, flame retardant, UV protection and self-cleaning, self-sterilizing, wrinkle resistance, heat storage, photochromic and thermochromic color changes and the improvement of the durability and wear resistance properties.

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