Study: wear and superhydrophobic behaviour of PTFE-ceria composite

Kumar

Journal of Composite Materials

2020

Self Cite

Present work aims at developing Magnesium based metal matrix composite (MMC) through in-situ reaction. In-situ generation of micro and nano particles in the Mg-melt is supposed to have a better bonding with the matrix. Ceric ammonium nitrate (CAN) is added to initial Magnesium melt (with an aim to generate CeO2 and MgO through in-situ reaction) at temperatures of 670 °C and 870 °C. The developed MMCs are solution treated to get rid of intermetallic. The nature of particles is explored with X-ray diffraction (XRD) and Energy dispersion spectroscopy (EDS). The morphology and sizes of particles are keenly jotted using scanning electron microscope (SEM). Mechanical responses of developed MMCs are recorded through Hardness, Compression and scratch tests. The compression fractured surfaces are analyzed with SEM and scratched samples are analyzed on 3 D optical profilometer to explore deformation behavior. The observations indicate the in-situ formation of CeO2, MgO and CeMg12 intermetallic phases in different types and sizes. Further, these particles are responsible for improved mechanical properties. The findings are supported by the contribution of different strengthening mechanisms.

Section: Introductionmentioning

confidence: 99%

Development of magnesium-based hybrid metal matrix composite through in situ micro, nano reinforcements

Kumar

Journal of Composite Materials

2020

Self Cite

“…In addition, it was found that MMNC has a strong ability to resist water impact. Therefore, the experimental data result shows that the composite material has little effect on the hydrophobicity of the coating, but the wear rate is greatly reduced [107].…”

Section: Super-hydrophobic Coatingmentioning

confidence: 97%

A Review of Dust Deposition Mechanism and Self-Cleaning Methods for Solar Photovoltaic Modules

Quan

Zhao

et al. 2022

Coatings

Large-scale solar photovoltaic (PV) power plants tend to be set in desert areas, which enjoy high irradiation and large spaces. However, due to frequent sandstorms, large amounts of contaminants and dirt are suspended in the air and deposited on photovoltaic modules, which greatly decreases the power efficiency and service life. To clean PV to improve efficiency, many methods were proposed. It was found that the application of the self-cleaning coating on PV modules can effectively reduce dust deposition and improve the efficiency of PV. This paper reviews the dust deposition mechanism on photovoltaic modules, classifies the very recent dust removal methods with a critical review, especially focusing on the mechanisms of super-hydrophobic and super-hydrophilic coatings, to serve as a reference for researchers and PV designers, and presents the current state of knowledge of the aspects mentioned above to promote sustainable improvement in PV efficiency. It was found that the behaviors of dust on photovoltaic modules are mainly deposition, rebound, and resuspension. Particles with a diameter of 1–100 μm are most easily deposited on photovoltaic modules. The use of self-cleaning coatings, especially super-hydrophobic coatings, is beneficial to the rebound and resuspension of particles. The research gaps and development prospects of self-cleaning coatings are also discussed in this paper.

Surf. Topogr.: Metrol. Prop.

“…Scanning electron micrograph (SEM) images of the famous lotus leaf shows that due to the waxy protrusions present, the water droplet obtains nearly spherical shape. SH behavior is characterized by the metastable WCA (more than 150°) on the resting surface with consistent and low surface energy and having roll-off angle less than 5° [26,27]. It has been well established by now that SH behavior can be accomplished only if two variables, namely multimodal surface morphology and low surface energy are effectively meeting the conditions of superhydropbhobicity.…”

Section: Conditions For Shsmentioning

confidence: 99%

Recent progresses in super-hydrophobicity and micro-texturing for engineering applications

Kumar¹,

Verma²,

Sharma³

et al. 2021

Increasing interests have been prevalent lately among the research fraternity for the development of superhydrophobic surfaces considering the favorable properties exuded by them. Recently, anti-microbial superhydrophobic coatings have been employed effectively in anti-biofouling, corrosion resistance, and self-cleaning, anti-reflecting coating, biomedical and cavitation erosion applications. Further, patterned topology by micro/nano surface texturing has been perceived as an engineering opportunity to enhance the surface performance and has opened various avenues for exploration. This work reports the recent research findings pertaining to the concept of superhydrophobicity and micro-texturing particularly in the context of their application for the impediment of corrosion in submerged components. The comprehensive review on superhydrophobic surfaces and micro-texturing suggests that the integrated application of these surface modification techniques for mechanical interlocking of deposited coating.