Development of durable self-cleaning superhydrophobic coatings for aluminium surfaces via chemical etching method

Kumar, Ayush; Gogoi, Bidisha

doi:10.1016/j.triboint.2018.02.032

Cited by 109 publications

(46 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In order to create a hierarchical structure on the aluminum surface, the samples were divided into three batches: The first batch was treated in boiling water for 5 min, the second one was chemically etched in HNO 3 /HCl (1:3) for 1 h, and the third one was etched in Beck's HF/HCl solution for 15 s. Then, the made specimens were ultrasonically washed and dried at 70 • C for 1 h. Afterward, the rough samples were immersed in 1 vol.% octadecyltrimethoxysilane/toluene solution for 10 min at room temperature and dried in an oven at 100 • C for 180 min for silane curing. All the parameters were optimized based on the literature [23][24][25] and preliminary tests performed in our laboratory. Table 1 illustrates the specimen details.…”

Section: Methodsmentioning

confidence: 99%

“…Moreover, the surface etched with HNO 3 /HCl solution appears as a multiple-scale structure with dimensions of 2 to 4 µm (microstructure). Nanometric pits, with dimensions lower than 200 nm, are randomly nucleated on the aluminum surface of these scales [25]. This bimodal structure is formed thanks to the associated action of the two acids [28].…”

Section: Surface Morphology and Roughnessmentioning

confidence: 99%

“…The self-assembled layers were grown by using toluene solution as an apolar reaction medium. Several solvents have been utilized in the literature, such as ethanol [41], toluene [25], and hexane [31], for self-assembled silane monolayers. However, only the polar solvents have been extensively used under the consideration that they dissolve the molecules well.…”

Section: Wettability Behaviormentioning

confidence: 99%

See 2 more Smart Citations

Superhydrophobic Self-Assembled Silane Monolayers on Hierarchical 6082 Aluminum Alloy for Anti-Corrosion Applications

2020

View full text Add to dashboard Cite

In this work, a two-stage methodology to design super-hydrophobic surfaces was proposed. The first step consists of creating a rough nano/micro-structure and the second step consists of reducing the surface energy using octadecyltrimethoxysilane. The surface roughening was realized by three different short-term pretreatments: (i) Boiling water, (ii) HNO3/HCl etching, or (iii) HF/HCl etching. Then, the surface energy was reduced by dip-coating in diluted solution of octadecyltrimethoxysilane to allow the formation of self-assembled silane monolayers on a 6082-T6 aluminum alloy surface. Super-hydrophobic aluminum surfaces were investigated by SEM-EDS, FTIR, profilometry, and contact and sliding angles measurements. The resulting surface morphologies by the three approaches were structured by a dual hierarchical nano/micro-roughness. The surface wettability varied with the applied roughening pretreatment. In particular, an extremely high water contact angle (around 180°) and low sliding angle (0°) were evidenced for the HF/HCl-etched silanized surface. The results of electrochemical tests demonstrate a remarkable enhancement of the aluminum alloy corrosion resistance through the proposed superhydrophobic surface modifications. Thus, the obtained results evidenced that the anti-wetting behavior of the aluminum surface can be optimized by coupling an appropriate roughening pretreatment with a self-assembled silane monolayer deposition (to reduce surface energy) for anticorrosion application.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Surface Morphology and Roughnessmentioning

confidence: 99%

Section: Wettability Behaviormentioning

confidence: 99%

See 1 more Smart Citation

Superhydrophobic Self-Assembled Silane Monolayers on Hierarchical 6082 Aluminum Alloy for Anti-Corrosion Applications

2020

View full text Add to dashboard Cite

show abstract

“…As a result, the design, preparation, application, and theoretical model of super-hydrophobic systems have investigated [8,10,11]. There are many techniques that can fabricate super-hydrophobic surfaces, which include sol-gel [12][13][14], chemical-etching [15][16][17], chemical vapor deposition (CVD) [18], anodicoxidation [19,20], and vapor-deposition [21,22]. Super-hydrophobic surfaces are commonly defined by having a contact angle greater than 150° and the rolling angle is less than 10° when the droplet contacts the solid surface.…”

Section: Introductionmentioning

confidence: 99%

Effect of surface roughness on the angular acceleration for a droplet on a super-hydrophobic surface

Jin-hua

Zeng

et al. 2020

Friction

View full text Add to dashboard Cite

The motion of droplets on a super-hydrophobic surface, whether by sliding or rolling, is a hot research topic. It affects the performance of super-hydrophobic materials in many industrial applications. In this study, a super-hydrophobic surface with a varied roughness is prepared by chemical-etching. The adhesive force of the advancing and receding contact angles for a droplet on a super-hydrophobic surface is characterized. The adhesive force increases with a decreased contact angle, and the minimum value is 0.0169 mN when the contact angle is 151.47°. At the same time, the motion of a droplet on the super-hydrophobic surface is investigated by using a high-speed camera and fluid software. The results show that the droplet rolls instead of sliding and the angular acceleration increases with an increased contact angle. The maximum value of the angular acceleration is 1,203.19 rad/s2 and this occurs when the contact angle is 151.47°. The relationship between the etching time, roughness, angular acceleration, and the adhesion force of the forward and backward contact angle are discussed.

show abstract

“…Up to now, various fabrication methods of superhydrophobic aluminum surfaces have been proposed, such as chemical etching [14,15,16,17], electrochemical etching [18,19], anodization [20,21], laser irradiation [22,23,24], electrospinning [25], layer-by-layer assembly [26], and spraying method [27]. Although the above methods can achieve the superhydrophobic aluminum surfaces, the researchers are only interested in the wettability of the surface or the preparation of superhydrophobic surfaces, and little attention is paid to the dynamic contact process of the droplets on the superhydrophobic surface.…”

Section: Introductionmentioning

confidence: 99%

Bouncing Dynamics of Impact Droplets on the Biomimetic Plane and Convex Superhydrophobic Surfaces with Dual-Level and Three-Level Structures

Lian

Ren

et al. 2019

Nanomaterials

View full text Add to dashboard Cite

Reducing the contact time of a water droplet on non-wetting surfaces has great potential in the areas of self-cleaning and anti-icing, and gradually develops into a hot issue in the field of wettability surfaces. However, the existing literature on dynamic behavior of water drops impacting on superhydrophobic surfaces with various structural shapes is insufficient. Inspired by the microstructure of lotus leaf and rice leaf, dual-level and three-level structures on plane and convex surfaces were successfully fabricated by wire electrical discharge machining on aluminum alloy. After spraying hydrophobic nanoparticles on the surfaces, the plane and convex surfaces with dual-level and three-level structures showed good superhydrophobic property. Bouncing dynamics of impact droplets on the superhydrophobic surfaces wereinvestigated, and the results indicated that the contact time of plane superhydrophobic surface with a three-level structure was minimal, which is 60.4% less than the plane superhydrophobic surface with dual-level structure. The effect of the interval S, width D, and height H of the structure on the plane superhydrophobic surface with three-level structure on contact time was evaluated to obtain the best structural parameters for reducing contact time. This research is believed to guide the direction of the structural design of the droplet impinging on solid surfaces.

show abstract

Development of durable self-cleaning superhydrophobic coatings for aluminium surfaces via chemical etching method

Cited by 109 publications

References 20 publications

Superhydrophobic Self-Assembled Silane Monolayers on Hierarchical 6082 Aluminum Alloy for Anti-Corrosion Applications

Superhydrophobic Self-Assembled Silane Monolayers on Hierarchical 6082 Aluminum Alloy for Anti-Corrosion Applications

Effect of surface roughness on the angular acceleration for a droplet on a super-hydrophobic surface

Bouncing Dynamics of Impact Droplets on the Biomimetic Plane and Convex Superhydrophobic Surfaces with Dual-Level and Three-Level Structures

Contact Info

Product

Resources

About