scholarly journals Self-cleaning, dirt and water-repellent coatings on the basis of nanotechnology (NanoTrust Dossier No. 020en - December 2010)

2012 ◽  
Keyword(s):  
Water Repellent ◽  
Self Cleaning

Fabrication of durable superhydrophobic Mg alloy surface with water-repellent, temperature-resistant, and self-cleaning properties

Vacuum ◽  
2020 ◽  
Vol 173 ◽  
pp. 109172 ◽  
Author(s):  
Xiaojie Li ◽  
Shaohui Yin ◽  
Shuai Huang ◽  
Hu Luo ◽  
Qingchun Tang
Keyword(s):  
Mg Alloy ◽  
Alloy Surface ◽  
Water Repellent ◽  
Self Cleaning

scholarly journals Lotus-Inspired Multiscale Superhydrophobic AA5083 Resisting Surface Contamination and Marine Corrosion Attack

Materials ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 1592 ◽  
Author(s):  
Binbin Zhang ◽  
Weichen Xu ◽  
Qingjun Zhu ◽  
Shuai Yuan ◽  
Yantao Li
Keyword(s):  
Photoelectron Spectroscopy ◽  
Chemical Elements ◽  
Surface Contamination ◽  
Localized Corrosion ◽  
Metallic Surface ◽  
Water Repellent ◽  
Corrosion Attack ◽  
X Ray ◽  
Self Cleaning

The massive and long-term service of 5083 aluminum alloy (AA5083) is restricted by several shortcomings in marine and industrial environments, such as proneness to localized corrosion attack, surface contamination, etc. Herein, we report a facile and cost-effective strategy to transform intrinsic hydrophilicity into water-repellent superhydrophobicity, combining fluorine-free chemisorption of a hydrophobic agent with etching texture. Dual-scale hierarchical structure, surface height relief and surface chemical elements were studied by field emission scanning electron microscopy (FE-SEM), atomic force microscopy (AFM), energy dispersive X-ray spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS), successively. Detailed investigations of the wetting property, self-cleaning effect, NaCl-particle self-propelling, corrosion and long-term behavior of the consequent superhydrophobic AA5083 surface were carried out, demonstrating extremely low adhesivity and outstanding water-repellent, self-cleaning and corrosion-resisting performance with long-term stability. We believe that the low cost, scalable and fluorine-free transforming of metallic surface wettability into waterproof superhydrophobicity is a possible strategy towards anti-contamination and marine anti-corrosion.

Preparation of organic–inorganic hybrid methylene blue polymerized organosilane/sepiolite pigments with superhydrophobic and self-cleaning properties

2019 ◽  
Vol 89 (19-20) ◽  
pp. 4220-4229 ◽  
Author(s):  
Shengtao Wu ◽  
Jinliang Huang ◽  
Haishuai Cui ◽  
Tian Ye ◽  
Fang Hao ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Natural World ◽  
Shielding Effect ◽  
Water Repellent ◽  
Inorganic Hybrid ◽  
Lotus Leaf ◽  
Spider Web ◽  
Chemical Inertness ◽  
Optical Stability ◽  
Self Cleaning

Inspired by the self-cleaning and water-repellent properties of the lotus leaf in the natural world, a kind of organic–inorganic hybrid pigment with superhydrophobic properties was prepared by adsorption of cationic methylene blue (MB) azo dyes onto acid-treated sepiolite (SEP), and then a superhydrophobic functional group of polymerized organosilanes (POSs) obtained from hexadecyltrimethoxysilane (HDTMS) and tetraethoxysilane (TEOS) was introduced onto the composite pigments (MB/SEP). The excellent chemical, thermal and optical stability of MB@POS/SEP are due to the shielding effect caused by the chemical inertness of the POS sheet. Furthermore, the superhydrophobic MB@POS/SEP pigments show an extraordinary self-cleaning property, which is similar to the waterproof property of the lotus leaf and spider web. The superhydrophobicity is strongly linked to their chemical composition and morphology, which can be adjusted by varying the concentration of HDTMS and TEOS. This kind of superhydrophobic pigment can be applied in various fields, such as ceramics, building and daily necessities.

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.

Self-cleaning effect of highly water-repellent microshell structures for solar cell applications

2011 ◽  
Vol 21 (3) ◽  
pp. 633-636 ◽  
Author(s):  
Yong-Bum Park ◽  
Hwon Im ◽  
Maesoon Im ◽  
Yang-Kyu Choi
Keyword(s):  
Solar Cell ◽  
Water Repellent ◽  
Self Cleaning

scholarly journals Superhydrophobic Surfaces Enabled by Femtosecond Fiber Laser-Written Nanostructures

2020 ◽  
Vol 10 (8) ◽  
pp. 2678
Author(s):  
Erin Liu ◽  
Hyeong Jae Lee ◽  
Xuejun Lu
Keyword(s):  
Fiber Laser ◽  
Metal Surfaces ◽  
Light Trapping ◽  
Extreme Temperature ◽  
Hierarchical Structures ◽  
Water Repellent ◽  
Potential Applications ◽  
Exciting Potential ◽  
Self Cleaning ◽  
Femtosecond Fiber Laser

Inspired by the self-cleaning and water-repellent lotus leaf, we have developed an efficient process to create superhydrophobic metal surfaces using a femtosecond fiber laser and have investigated the mechanisms of the structured metal surfaces in relation to their hydrophobicity. The at will feature of femtosecond fiber lasers can write versatile patterns of hydrophobicity with nanoscale precision on any metal. The results show that the homogeneously distributed hierarchical structures exhibit multifunctional properties, including superhydrophobicity, self-cleaning, and light-trapping. By optimizing the fabrication conditions, we have achieved a contact angle as high as 171° and a rolling angle of less than 3°. The structure is also resistant to an extreme temperature range of −40 °C to 71 °C and temperature shocks from 20 °C to −40 °C. This research highlights the exciting potential applications of superhydrophobic metals in the aviation, biomedical, and solar energy industries and beyond.

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.

Micro-, nano- and hierarchical structures for superhydrophobicity, self-cleaning and low adhesion

2009 ◽  
Vol 367 (1894) ◽  
pp. 1631-1672 ◽  
Author(s):  
Bharat Bhushan ◽  
Yong Chae Jung ◽  
Kerstin Koch
Keyword(s):  
Contact Angle ◽  
Low Cost ◽  
Contact Angle Hysteresis ◽  
Hierarchical Structures ◽  
Adhesive Force ◽  
Water Repellent ◽  
Lotus Effect ◽  
Composite State ◽  
Static Contact ◽  
Self Cleaning

Superhydrophobic surfaces exhibit extreme water-repellent properties. These surfaces with high contact angle and low contact angle hysteresis also exhibit a self-cleaning effect and low drag for fluid flow. Certain plant leaves, such as lotus leaves, are known to be superhydrophobic and self-cleaning due to the hierarchical roughness of their leaf surfaces. The self-cleaning phenomenon is widely known as the ‘lotus effect’. Superhydrophobic and self-cleaning surfaces can be produced by using roughness combined with hydrophobic coatings. In this paper, the effect of micro- and nanopatterned polymers on hydrophobicity is reviewed. Silicon surfaces patterned with pillars and deposited with a hydrophobic coating were studied to demonstrate how the effects of pitch value, droplet size and impact velocity influence the transition from a composite state to a wetted state. In order to fabricate hierarchical structures, a low-cost and flexible technique that involves replication of microstructures and self-assembly of hydrophobic waxes is described. The influence of micro-, nano- and hierarchical structures on superhydrophobicity is discussed by the investigation of static contact angle, contact angle hysteresis, droplet evaporation and propensity for air pocket formation. In addition, their influence on adhesive force as well as efficiency of self-cleaning is discussed.

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