Development of hybrid hydrophobic molybdenum disulfide (MoS2) nanoparticles for super water repellent self-cleaning

In this modern era, nanofluids are considered one of the advanced kinds of heat transferring fluids due to their enhanced thermal features. The present study is conducted to investigate that how the suspension of molybdenum-disulfide (MoS2) nanoparticles boosts the thermal performance of a Casson-type fluid. Sodium alginate (NaAlg) based nanofluid is contained inside a vertical channel of width d and it exhibits a flow due to the movement of the left wall. The walls are nested in a permeable medium, and a uniform magnetic field and radiation flux are also involved in determining flow patterns and thermal behavior of the nanofluid. Depending on velocity boundary conditions, the flow phenomenon is examined for three different situations. To evaluate the influence of shape factor, MoS2 nanoparticles of blade, cylinder, platelet, and brick shapes are considered. The mathematical modeling is performed in the form of non-integer order operators, and a double fractional analysis is carried out by separately solving Caputo-Fabrizio and Atangana-Baleanu operators based fractional models. The system of coupled PDEs is converted to ODEs by operating the Laplace transformation, and Zakian’s algorithm is applied to approximate the Laplace inversion numerically. The solutions of flow and energy equations are presented in terms of graphical illustrations and tables to discuss important physical aspects of the observed problem. Moreover, a detailed inspection on shear stress and Nusselt number is carried out to get a deep insight into skin friction and heat transfer mechanisms. It is analyzed that the suspension of MoS2 nanoparticles leads to ameliorating the heat transfer rate up to 9.5%. To serve the purpose of achieving maximum heat transfer rate and reduced skin friction, the Atangana-Baleanu operator based fractional model is more effective. Furthermore, it is perceived that velocity and energy functions of the nanofluid exhibit significant variations because of the different shapes of nanoparticles.

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Tribological Studies of Transmission Oil Dispersed With Molybdenum Disulfide and Tungsten Disulfide Nanoparticles

Journal of Tribology ◽

10.1115/1.4034766 ◽

2017 ◽

Vol 139 (4) ◽

Cited By ~ 3

Author(s):

V. Srinivas ◽

R. N. Thakur ◽

A. K. Jain ◽

M. Saratchandra Babu

Keyword(s):

Molybdenum Disulfide ◽

Size Variation ◽

Tungsten Disulfide ◽

Particle Size Analyzer ◽

Transmission Oil ◽

Mos2 Nanoparticles ◽

The Stability ◽

Friction And Wear Characteristics ◽

Load Conditions ◽

And Tungsten

This paper compares the tribological properties of transmission oil dispersed with molybdenum disulfide (MoS2) and tungsten disulfide (WS2) nanoparticles. Lubricant samples are prepared by dispersing MoS2 and WS2 nanoparticles in 0.5 wt.% in transmission oil. The nanoparticles are stabilized in the lubricant by surface modification with surfactant SPAN 80. The stability of the lubricant in terms of size variation of dispersed nanoparticles is evaluated using particle size analyzer. The antiwear, antifriction, and extreme pressure (EP) properties are tested on a four-ball wear tester and a comparison is made to assess the relative performance of MoS2 and WS2 nanoparticles. The friction and wear characteristics of lubricant dispersed with nanoparticles are strongly dependent upon the load taken into consideration. The lubricant dispersed with WS2 nanoparticles gave higher weld load and load wear index (LWI) than that of lubricant dispersed with MoS2 nanoparticles. The metallographic studies show that under high load conditions, the WS2 nanoparticles deposit more than MoS2 nanoparticles, thereby giving better performance at higher load conditions.

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

10.1553/ita-nt-020en ◽

2012 ◽

Keyword(s):

Water Repellent ◽

Self Cleaning

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

Vacuum ◽

10.1016/j.vacuum.2020.109172 ◽

2020 ◽

Vol 173 ◽

pp. 109172 ◽

Cited By ~ 5

Author(s):

Xiaojie Li ◽

Shaohui Yin ◽

Shuai Huang ◽

Hu Luo ◽

Qingchun Tang

Keyword(s):

Mg Alloy ◽

Alloy Surface ◽

Water Repellent ◽

Self Cleaning

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

Materials ◽

10.3390/ma12101592 ◽

2019 ◽

Vol 12 (10) ◽

pp. 1592 ◽

Cited By ~ 10

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.

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

Textile Research Journal ◽

10.1177/0040517519829924 ◽

2019 ◽

Vol 89 (19-20) ◽

pp. 4220-4229 ◽

Cited By ~ 2

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.

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Production and Properties of Molybdenum Disulfide/Graphene Oxide Hybrid Nanostructures for Catalytic Applications

Nanomaterials ◽

10.3390/nano10091865 ◽

2020 ◽

Vol 10 (9) ◽

pp. 1865

Author(s):

Zuzanna Bojarska ◽

Marta Mazurkiewicz-Pawlicka ◽

Stanisław Gierlotka ◽

Łukasz Makowski

Keyword(s):

Graphene Oxide ◽

Molybdenum Disulfide ◽

Carbon Nanomaterials ◽

Analytical Techniques ◽

Linear Sweep Voltammetry ◽

Production Method ◽

Physicochemical Analysis ◽

Electrode System ◽

Hybrid Nanostructures ◽

Mos2 Nanoparticles

Molybdenum disulfide (MoS2) can be an excellent candidate for being combined with carbon nanomaterials to obtain new hybrid nanostructures with outstanding properties, including higher catalytic activity. The aim of the conducted research was to develop the novel production method of hybrid nanostructures formed from MoS2 and graphene oxide (GO). The nanostructures were synthesized in different weight ratios and in two types of reactors (i.e., impinging jet and semi-batch reactors). Physicochemical analysis of the obtained materials was carried out, using various analytical techniques: particle size distribution (PSD), thermogravimetric analysis (TGA), FT-IR spectroscopy, X-ray diffraction (XRD), and scanning electron microscopy (SEM). Due to the potential application of materials based on MoS2 as the catalyst for hydrogen evolution reaction, linear sweep voltammetry (LSV) of the commercial MoS2, synthesized MoS2 and the obtained hybrid nanostructures was performed using a three-electrode system. The results show that the developed synthesis of hybrid MoS2/GO nanostructures in continuous reactors is a novel and facile method for obtaining products with desired properties. The hybrid nanostructures have shown better electrochemical properties and higher onset potentials compared to MoS2 nanoparticles. The results indicate that the addition of carbon nanomaterials during the synthesis improves the activity and stability of the MoS2 nanoparticles.

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Progress in Sol-Gel Technology for the Coatings of Fabrics

Materials ◽

10.3390/ma13081838 ◽

2020 ◽

Vol 13 (8) ◽

pp. 1838 ◽

Cited By ~ 1

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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