Recent Progresses in Super-Hydrophobicity and Micro-Texturing for Engineering Applications

2021 ◽  
Author(s):  
Vijay Kumar ◽  
Rajeev Verma ◽  
Vishal S Sharma ◽  
Varun Sharma
Keyword(s):  
Corrosion Resistance ◽  
Cavitation Erosion ◽  
Surface Texturing ◽  
Superhydrophobic Surfaces ◽  
Mechanical Interlocking ◽  
Comprehensive Review ◽  
Superhydrophobic Coatings ◽  
Research Findings ◽  
Surface Performance ◽  
Surface Modification Techniques

Abstract 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.

Superhydrophobic Coatings: The Salvinia Paradox: Superhydrophobic Surfaces with Hydrophilic Pins for Air Retention Under Water (Adv. Mater. 21/2010)

2010 ◽  
Vol 22 (21) ◽  
pp. n/a-n/a ◽  
Author(s):  
Wilhelm Barthlott ◽  
Thomas Schimmel ◽  
Sabine Wiersch ◽  
Kerstin Koch ◽  
Martin Brede ◽  
...  
Keyword(s):  
Superhydrophobic Surfaces ◽  
Superhydrophobic Coatings

REVIEW ON IMPROVING WEAR AND CORROSION RESISTANCE OF STEELS VIA PLASMA ELECTROLYTIC SATURATION TECHNOLOGY

2016 ◽  
Vol 23 (04) ◽  
pp. 1630002 ◽  
Author(s):  
NAIMING LIN ◽  
RUIZHEN XIE ◽  
PENG ZHOU ◽  
JIAOJUAN ZOU ◽  
YONG MA ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
High Hardness ◽  
High Voltage Power Supply ◽  
Quenching Effect ◽  
Wear And Corrosion ◽  
The Status ◽  
Surface Performance ◽  
Steel Surfaces ◽  
Wear And Corrosion Resistance ◽  
Plasma Electrolytic

Plasma electrolytic saturation (PES) technique which holds the advantages of short treating time and limited heating influence and immediate quenching effect is conducted under high voltage power supply in some electrolyte has been extensively applied to enhance the surface performance of metallic materials. Steel is widely used in various fields thanks to its promising merits of easy workability, plasticity, toughness and weldability. It accounts for a large proportion in the application scope of the metal materials. Steel surfaces with good corrosion resistance, promising wear resistance and high hardness would be obtained by PES. Meanwhile, uniformed coatings can be formed without special requirements for substrate geometries using the PES. This paper first presents a brief introduction of the technological principle of PES. The status on studies and applications of PES for improving surface performance of steels has been reviewed.

scholarly journals An Investigation into Students’ Agentic Engagement in Online English Listening Learning

2020 ◽  
Vol 11 (3) ◽  
pp. 409
Author(s):  
Yanxiu Dong ◽  
Suli Liu
Keyword(s):  
Course Design ◽  
Current Situation ◽  
Comprehensive Review ◽  
Learning Platform ◽  
English Majors ◽  
English Major ◽  
E Learning ◽  
Research Findings ◽  
Low Motivation

This paper provides a comprehensive review on the current situation of non-English major students’ agentic engagement in online English listening course. The paper aims to investigate students’ low motivation in doing their online listening homework. Paper questionnaires and SPSS 22.0 were used to analyze the results. 46 freshmen and 43 sophomores of non-English majors participated in this research. It has been found that the agentic engagement of non-English majors is low and freshmen’s average agentic engagement is higher than sophomores’. Besides, it doesn’t have significant correlations with students’ scores in online weekly tasks. The research findings indicate the importance of raising teachers’ awareness of student agentic engagement, and a more effective e-learning platform is required. At last, with the results of this investigation, the current study provides some suggestions for future English listening course design.

Corrosion resistance and wetting properties of silica-based superhydrophobic coatings on AZ31B Mg alloy surfaces

2018 ◽  
Vol 453 ◽  
pp. 1-10 ◽  
Author(s):  
Zhiqiang Qian ◽  
Shidong Wang ◽  
Xiushen Ye ◽  
Zhong Liu ◽  
Zhijian Wu
Keyword(s):  
Corrosion Resistance ◽  
Mg Alloy ◽  
Wetting Properties ◽  
Superhydrophobic Coatings

Harnessing superhydrophobic coatings for enhancing the surface corrosion resistance of magnesium alloys

2021 ◽  
Author(s):  
Rong Gu ◽  
Jie Shen ◽  
Qing Hao ◽  
Jinghong Wang ◽  
Dan Li ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloys ◽  
Mg Alloy ◽  
Surface Corrosion ◽  
Superhydrophobic Coatings

A superhydrophobic Mg alloy was obtained by depositing SiO2-F NPs in the presence of PDA, presenting excellent capability against corrosion.

APATITIC NANOPOWDERS AND COATINGS: A COMPREHENSIVE REVIEW

2021 ◽  
Author(s):  
RAVINDER PAL SINGH ◽  
UMA BATRA
Keyword(s):  
Sol Gel ◽  
Dip Coating ◽  
Clinical Applications ◽  
Hard Tissue ◽  
Preparation Methods ◽  
Comprehensive Review ◽  
Metallic Substrates ◽  
Surface Modification Techniques ◽  
Dental Applications ◽  
Insight Into

The use of artificial biomaterials has been acclaiming potential therapeutic scope in diverse clinical applications. This review started with the description of the basics of biomaterials, and desirable properties, which are the prerequisites to understand biomaterials. The orthopedic biomaterials, their classification and the importance of calcium phosphate (CaP) materials for hard-tissue applications were utterly discussed. Furthermore, among the various CaP biominerals, the importance of hydroxyapatite (HAP) and its synthesis techniques was comprehensively reviewed. The sol–gel route for the synthesis of HAP nanoparticles and deposition of coatings were systematically studied. Among the metallic substrates, Ti6Al4V alloy remained the focus of this study. Moreover, several film pre-preparation methods were also given due importance. The importance of other surface modification techniques, especially in the context of Ti6Al4V substrates, was also discussed. Among several coating techniques to deposit CaP coatings, special attention was paid to the spin and dip coating techniques. In addition to monolithic HAP coatings, reinforced and antimicrobial HAP coatings were also reviewed from broad perspectives. Therefore, this review provides an in-depth insight into the preparation and properties of apatitic nanoparticles and their coatings for orthopedic and dental applications.

Tribological performance of textured parallel sliding contact under mixed lubrication condition by considering mass conservation condition and couple-stress parameter

2020 ◽  
pp. 135065012094508
Author(s):  
Annadi Ramana Reddy ◽  
Syed Ismail
Keyword(s):  
Couple Stress ◽  
Surface Texturing ◽  
Frictional Coefficient ◽  
Mass Conservation ◽  
Tribological Performance ◽  
Mixed Lubrication ◽  
Numerical Code ◽  
Performance Parameters ◽  
Mixed Lubrication Regime ◽  
Surface Modification Techniques

To enhance the tribological performance of mechanical parts, one of the reliable methods is surface topography modification, in which the surface of one/both interacting contacts were to be modified. Surface texturing is one of the surface modification techniques. In the present work, a numerical code is developed to address the effect of texture shape (elliptical and triangular), size and distribution (parallel and zigzag) on the tribological performance parameters (minimum film thickness, percentage of hydrodynamic load from the total generated pressure and frictional coefficient) under mixed lubrication regime for a known value of load support. In the present analysis, the mass conservative, i.e. Jakobson-Floberg-Ollson (JFO) cavitation condition and couple stresses of lubricant are considered. In addition, surface irregularities are considered by using the flow factors of Patir-Cheng model. The results show that texture shape has a significant effect, whereas the texture distribution has a slight effect on the tribological performance parameters. Moreover, the couple stress of lubricant has a prominent effect on the tribological performance.

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