Preparation of Superhydrophobic Surfaces Based on Rod-Shaped Micro-Structure Induced by Nanosecond Laser

Zhi Li; Gang Xue; Yanming Wu; Xinghua Wang; Hengpei Pan

doi:10.3390/cryst11111274

Preparation of Superhydrophobic Surfaces Based on Rod-Shaped Micro-Structure Induced by Nanosecond Laser

Crystals ◽

10.3390/cryst11111274 ◽

2021 ◽

Vol 11 (11) ◽

pp. 1274

Author(s):

Zhi Li ◽

Gang Xue ◽

Yanming Wu ◽

Xinghua Wang ◽

Hengpei Pan

Keyword(s):

Surface Oxidation ◽

Frictional Resistance ◽

Superhydrophobic Surfaces ◽

Major Influence ◽

Nanosecond Laser ◽

Al Alloy ◽

Ti Alloy ◽

Micro Structure ◽

Coefficient Of Thermal Conductivity ◽

Layer Effect

Solid–liquid frictional resistance is mainly attributed to the adhesion caused by the boundary layer effect. Superhydrophobic surfaces are expected to be an effective method to reduce frictional resistance. In this paper, a rod-shaped micro-structure was prepared on surfaces of Al alloy (5083) and Ti alloy (TC4) by line-by-line scanning with nanosecond laser. The inherent properties of the metal materials—such as their coefficient of thermal conductivity (CTC) and specific heat capacity (SHC)—had a major influence on the surface morphology and shape size of the rod-shaped micro-structure. Both two metals showed apparent oxidation on their surfaces during laser ablation, however, the degree of surface oxidation of the Al alloy was greater than that of the Ti alloy due to its more fragmentary rod-shaped micro-structure. The laser-treated surfaces could turn from hydrophilic to hydrophobic or even superhydrophobic after being left in the air for 20 days, which might be caused by the adsorption of low-surface energy matter in the air. In addition, the contact angle of the Al alloy was larger than that of the Ti alloy, which is due to the larger ratio of height to width of the micro–nano composite rod-shaped micro-structure on the surface of the Al alloy.

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Air Lubrication Influence on Frictional Resistance Reduction of Multi-Purpose Amphibious Vehicle

Jurnal Teknologi ◽

10.11113/jt.v74.4633 ◽

2015 ◽

Vol 74 (5) ◽

Author(s):

M. Nakisa ◽

A. Maimun ◽

Yasser M. Ahmed ◽

F. Behrouzi ◽

Jaswar Jaswar ◽

...

Keyword(s):

Frictional Resistance ◽

Hydrodynamic Resistance ◽

Marine Vehicles ◽

Resistance Reduction ◽

Ansys Cfx ◽

Lubrication Layer ◽

Air Lubrication ◽

Layer Effect ◽

Air Cushion ◽

Pump Compressor

The presentarticle focuses on the hydrodynamic resistance reduction of Multipurpose Amphibious Vehicles (MAV) usingthe air lubrication layer effect. The use of air cushions to support marine vehicles, heavy floating structures and in other operation is well known. The main problem in Multi-purpose Amphibious Vehicles (MAV) is the amount of power needed in order to overcome the hydrodynamic resistance acting on the hull which is included the frictional and pressure resistances. Therefore, more power is needed to move the MAV forward. In this respect, more fuel will be required to operate the amphibious vehicles. This problem could be effectively reduced by the introduction of the air cushion concept. With the air being drawn from top of craft to the cavity below the hull will produce some cushioning effect and also help to reduce skin friction drag. In this paper, air cushion effect will be studied in rigid surface cavity instead of using flexible skirts. This would avoid the problem of high maintenance due to replacement of damaged skirts. Finally, the MAV will be supported using air cavity and bubbles generated by an air pump (compressor and air pressure vessel) to pushes the hull of multi-purpose amphibious vehicle up and reduce the frictional resistance due to draft and wetted surface reduction and layer of air between hull surface and water. This research would be done via CFD (ANSYS-CFX 14.0) and analyzed the hydrodynamic resistance.

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Comparative Study of Surface Contaminated Layer on Titanium Aluminum Alloy and Titanium Alloy Investment Castings

Materials Science Forum ◽

10.4028/www.scientific.net/msf.1035.602 ◽

2021 ◽

Vol 1035 ◽

pp. 602-607

Author(s):

Zhi Hua Feng ◽

Xian Fei Ding ◽

Xin Feng ◽

Hai Nan ◽

Ai Bin Zhang

Keyword(s):

Titanium Alloy ◽

Aluminum Alloy ◽

Comparative Study ◽

Chemical Reaction ◽

Microhardness Measurement ◽

Ceramic Mold ◽

Al Alloy ◽

Ti Alloy ◽

Titanium Aluminum ◽

Alloy Castings

A comparative study of the surface contaminated layer formed by chemical reaction between ceramic-mold and titanium aluminum alloy castings or titanium alloy castings were carried out. The morphology, thickness and hardness of the surface contaminated layer were characterized by means of metalloscopy and microhardness measurement. The results show that surface contaminated layers formed between Ti-Al alloy castings and ceramic-mold, also formed between Ti alloy castings and ceramic-mold. The surface contaminated layers of Ti-Al alloy castings were continuous and compact, their thickness was about 0~90 μm. The surface contaminated layers of titanium alloy castings were not even, their thickness was 0~900 μm. Titanium alloy is more liable to react with the ceramic -mold than the Ti-Al alloy.

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Femtosecond laser ablation of Ti alloy and Al alloy

Optik ◽

10.1016/j.ijleo.2020.164628 ◽

2020 ◽

Vol 212 ◽

pp. 164628

Author(s):

Shizhen Xu ◽

Yu Chen ◽

Hao Liu ◽

Xinxiang Miao ◽

Xiaodong Yuan ◽

...

Keyword(s):

Laser Ablation ◽

Femtosecond Laser ◽

Femtosecond Laser Ablation ◽

Al Alloy ◽

Ti Alloy

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Combined effects of nanosecond laser-induced surface oxidation and nanostructure formation for selective colorization of nickel surfaces

Applied Physics A ◽

10.1007/s00339-019-2985-y ◽

2019 ◽

Vol 125 (10) ◽

Author(s):

Huazhong Zhu ◽

Martin Ehrhardt ◽

Pierre Lorenz ◽

Joachim Zajadacz ◽

Jian Lu ◽

...

Keyword(s):

Surface Oxidation ◽

Nanosecond Laser ◽

Combined Effects ◽

Nanostructure Formation

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Fast Fabrication of Superhydrophobic Titanium Alloy as Antibacterial Surface Using Nanosecond Laser Texturing

Journal of Micro and Nano-Manufacturing ◽

10.1115/1.4038093 ◽

2017 ◽

Vol 6 (1) ◽

Cited By ~ 12

Author(s):

Deepak Patil ◽

S. Aravindan ◽

Mishi Kaushal Wasson ◽

Vivekanandan P. ◽

P. V. Rao

Keyword(s):

Biofilm Formation ◽

Sessile Drop ◽

Superhydrophobic Surfaces ◽

Surface Generation ◽

Nanosecond Laser ◽

X Ray Diffraction ◽

Nanosecond Pulsed Laser ◽

Grade 5 ◽

Antibacterial Surface ◽

Xrd Techniques

The method for fast fabrication of superhydrophobic surfaces was proposed to resist the formation of biofilm of Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) for orthopedic and dental implants. Laser beam machining with nanosecond pulsed laser (Nd:YAG) was used to fabricate pit structure on Grade-5 Ti–6Al–4V alloy followed by annealing (at 300 °C with different time scales) in order to reduce the transition time from hydrophilic to superhydrophobic surface generation. Field emission scanning electron microscopy (FE-SEM) and X-ray diffraction (XRD) techniques were used to characterize the textured samples. The surface wettability of plain and textured samples was measured by the sessile drop method using goniometer. The biofilm formation was qualitatively and quantitatively evaluated by FE-SEM and crystal violet binding assay, respectively. The biofilm formation was observed on plain (hydrophilic) surface for both the types of bacteria, whereas significantly less biofilm formation was observed on the laser textured (superhydrophobic) surfaces. The proposed method helps in reducing the risk of infection associated with implants without using cytotoxic bactericidal agents.

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Si diffusion behavior during laser welding-brazing of Al alloy and Ti alloy with Al-12Si filler wire

Transactions of Nonferrous Metals Society of China ◽

10.1016/s1003-6326(09)60098-4 ◽

2010 ◽

Vol 20 (1) ◽

pp. 64-70 ◽

Cited By ~ 62

Author(s):

Shu-hai CHEN ◽

Li-qun LI ◽

Yan-bin CHEN ◽

De-jian LIU

Keyword(s):

Laser Welding ◽

Al Alloy ◽

Filler Wire ◽

Ti Alloy ◽

Diffusion Behavior

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Interfacial reaction mode and its influence on tensile strength in laser joining Al alloy to Ti alloy

Materials Science and Technology ◽

10.1179/174328409x399056 ◽

2010 ◽

Vol 26 (2) ◽

pp. 230-235 ◽

Cited By ~ 27

Author(s):

S. H. Chen ◽

L. Q. Li ◽

Y. B. Chen

Keyword(s):

Tensile Strength ◽

Interfacial Reaction ◽

Al Alloy ◽

Ti Alloy ◽

Laser Joining

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Experimental Research on Micro Structure And Mechanical Properties of Al Alloy Utilizing Sustainable Biomass As Quenching Medium

International Journal of Innovative Technology and Exploring Engineering - Special Issue ◽

10.35940/ijitee.k2546.0981119 ◽

2019 ◽

Vol 8 (11) ◽

pp. 3695-3699

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Yield Strength ◽

Grain Refinement ◽

Experimental Research ◽

Al Alloy ◽

Maximum Hardness ◽

Micro Structure ◽

Quenching Media ◽

Cow Urine

Quenching media, time, temperature are prime factors towards the enhancement of grain refinement structure and mechanical properties in metals. The present study reports the usage of novel quenching media that is cow urine to improve the mechanical properties that is tensile strength, yield strength and hardness of Al 2585 alloy. The ingredients such as (sodium, nitrogen, sulphur, Vitamin A, B, C, D, E, minerals, manganese, iron, silicon, chlorine, magnesium etc.,) present in cow urine are homogenously which help to improve micro structure and mechanical properties of Al alloy 2585. From the study, it is revealed that maximum tensile strength and yield strength is improved and grain refinement is exhibited at 50% blend. Likewise maximum hardness at 80% blends.

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