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Application of Nanotechnology-Based UV Finishes on Textiles and Their Evaluation
Published in Prashansa Sharma, Devsuni Singh, Vivek Dave, Fundamentals of Nano–Textile Science, 2023
The use of nanomaterials in textiles is very vast. Its application on textiles may convert textiles into functional textiles by making them water repellant, antistatic, wrinkle resistance, UV resistant, antibacterial, etc. (Yetisen et al., 2016). It was found that self-assembly coating of CsxWO3 nanostructured material on cotton fabric enhanced its UV blocking, heat insulation, and self-cleaning properties. When wool is treated with some particular nanostructured material, its shrinkage resistance property improved significantly (Bakker et al., 2018). To impart antimicrobial property in textiles, copper nanoparticles, zinc oxide, and silver nanoparticles are used (Ditaranto et al., 2016; Emam et al., 2014; Emam et al., 2015; Emam et al., 2016; Yalcinkaya et al., 2016). It was also found that silver nanoparticle imparts antimicrobial property in textile materials (Martin et al., 2011). There are some nanomaterials which show self-cleaning property. Titanium dioxide nanomaterial is one of them (Saif et al., 2013).
Materials System for Functional Properties of Metal Matrix Composites
Published in Suneev Anil Bansal, Virat Khanna, Pallav Gupta, Metal Matrix Composites, 2023
Satnam Singh, Sarbjeet Kaushal, Michele Forzan
The properties of self-cleaning of materials are also inspired by nature, such as hydrophobicity in the case of the lotus leaf. The textured surface containing a certain type of pattern can produce superhydrophobic surfaces, where water and bacteria cannot stick to the surfaces. This is the need for many utensils where Teflon coatings can be replaced by laser textures surfaces which can prevent bacterial growth. There are many applications where self-cleaning of materials can play a lot of important roles such as in the case of solar cell panels, anti-icing hydrophobic coatings, etc. A lot of work has already been carried out in the area of self-cleaning paints which are widely available on the market. However, limited study has been carried out on coatings for bulk metal matrix composites for such properties.
Effectiveness of UV-C light irradiation on disinfection of an eSOS™ Smart Toilet
Published in Fiona Zakaria, Rethinking Faecal Sludge Management in Emergency Settings, 2019
Those cleaning innovations were explored to be incorporated as part of eSOS toilet surface cleaning regimes. The first self-cleaning technology candidate was the application of nano-coating. However, after preliminary laboratory testing, the nano-coating was found to wear off easily requiring frequent re-application. Thus, the idea of using nano-coating for self-cleaning technology in eSOS toilet was rejected.
An overview of self-engineering systems
Published in Journal of Engineering Design, 2021
Some other commonly used SE terms include: Self-cleaning – Self-cleaning means that the removal of fouling material happens automatically. It should be noted that self-cleaning materials (such as Teflon) are hydrophobic, allowing water to slide off and carrying dirt with it. This is not a SE system as the response happens because of the material properties not as a response to a loss (or potential loss) in function.Self-assembly – The system can configure from parts into an operating system autonomously.Self-strengthening – The system can add stability in response to observed weakness to prevent failure.Self-folding – The system can be bent or flatten into a more compact shape to preserve components or functionality; this is often done as part of a self-strengthening, self-assembly or self-adapting process.Self-managing – The system has control of itself often utilising other self-* properties to do this; it is used in autonomic computing.
Effect of Soiling on the Performance of Solar PV Modules: A Case Study of Aligarh
Published in Smart Science, 2021
Mohd Tariq, Mohsin Karim Ansari, Fazlur Rahman, Md Atiqur Rahman, Imtiaz Ashraf
With the increasing deposition of dust, efficiency and power output of module decreases. Performance reduction of solar PV modules is directly affected by the dust particles. These particles may be the combination of all or some of them such as fibers, metals, metal oxides, pollen, organic matters and hydrocarbons. There may be dust in the atmosphere from various sources like industries, constructional sources and dust storms [5].The dust has visual and invisible, floating and fallen particles. The output power of PV cell is also affected for different air velocity and dust density [7]. The type of cleaning method depends on the geographical terrain, area of application, and economic feasibility. Self-cleaning methods have the advantage of low cost and low energy consumption. Self-cleaning methods detail and application feasibility is presented in [8]and [9]. But they are not suitable for large solar PV farms. However, automatic cleaning methods are preferable for large-scale plants, frequent cleaning and water-scarce region as most self-cleaning methods have water as their main component. A detailed solution of PV cleaning from Earth to Mars based on automatic cleaning is provided in [10] .
Self-cleaned zirconia coatings prepared using a co-precursor sol–gel method
Published in Surface Engineering, 2021
Uzma K.H. Bangi, Akshay A. Ransing, Kyu-Yeon Lee, Hyung-Ho Park
The self-cleaning coating technologies are found to have high potential in the commercial products owing to their ability to reduce cleaning labour costs. These coatings exhibit a wide variety of applications in window glasses, cements, textiles and paints [1]. There are two categories of the self-cleaning coatings, namely hydrophobic and hydrophilic coatings. Both of these coatings possess the property to clean themselves in the presence of water. The contact angle of water on a surface plays a vital role in determining the ability of that surface to self-clean. The ‘lotus effect’ is a common case of the self-cleaning, where water droplets can be seen on the surface of a lotus leaf owing to its hydrophobicity [2]. Hydrophobic coatings have high water contact angles above 90° and serve as self-cleaning coatings. These coatings are highly water repellent and water tends to form spherical droplets that roll away dirt from their surfaces. Chemically, the coating surfaces are made hydrophobic using the organosilane compounds by replacing the surface polar hydroxyl groups with the non-polar alkyl groups. On these hydrophobic coatings, the non-polar substances aggregate in an aqueous solution and exclude the water molecules from their surface. There are many reports available on the hydrophobic self-cleaning coatings based on silica (SiO2) [3–5]. The hydrophilic surfaces have low contact angles (below 90°), and the hydrophilic self-cleaning coatings are based on photocatalysis. Such coatings are able to break down the impurities when exposed to light taking away the dirt from their surface. Titanium dioxide (TiO2) coatings are well-known for the hydrophilic self-cleaning surfaces [6–9] owing to their favourable physical and chemical properties.