Fabrication of Aluminum Superhydrophobic Surface with Facile Chemical Etching Method

2014 ◽  
Vol 804 ◽  
pp. 103-106 ◽  
Author(s):  
Zhen Huang ◽  
Yu Feng Li ◽  
Pu Jin ◽  
Meng Shan Hu ◽  
Bo He ◽  
...  
Keyword(s):  
Contact Angle ◽  
Chemical Etching ◽  
Surface Hydrophobicity ◽  
Etching Time ◽  
Sliding Angle ◽  
Maximum Value ◽  
Potential Applications ◽  
Superhydrophobic Property ◽  
Aluminum Surfaces ◽  
The Relationship

Superhydrophobic surfaces have attracted much interest for its potential applications. In this study, the superhydrophobic aluminum surfaces were fabricated by method of chemical etching. Aluminum surfaces were firstly chemically etched by hydrochloric acid, and modified with stearic acid. The relationship between the etching time and the surface hydrophobicity was investigated. The contact angle and the sliding angle were tested, the results showed that with increasing etching time, the contact angle experienced a rise and then decrease, while the sliding angle dropped first and then started to climb. A maximum value of 152 degrees for the contact angle and a minimum value of 3 degrees for the sliding angle were obtained with etching time of 1 minute. The results indicated an ideal superhydrophobic property of the aluminum surfaces.

Micro-Nanostructured Silicone Rubber Surfaces Using Compression Molding

2018 ◽  
Vol 941 ◽  
pp. 1802-1807 ◽  
Author(s):  
Khosrow Maghsoudi ◽  
Gelareh Momen ◽  
Reza Jafari ◽  
Masoud Farzaneh ◽  
Tony Carreira
Keyword(s):  
Surface Roughness ◽  
Contact Angle ◽  
Silicone Rubber ◽  
Surface Characterization ◽  
Contact Angle Hysteresis ◽  
Compression Molding ◽  
Sliding Angle ◽  
Water Contact ◽  
Superhydrophobic Property ◽  
Aluminum Surfaces

A facile method is introduced for production of micro-nanostructured silicone rubber surfaces by means of direct replication using a compression molding system. The fabricated samples possessing surface roughness display water contact angle of more than 160o and contact angle hysteresis (CAH) and sliding angle of less than 5o. Such low surface wettability of silicone specimens verifies the induced superhydrophobic property. Chemically etched aluminum surfaces could work excellently as templates whose patterns were replicated on the rubber surfaces successfully. Various etching conditions were examined. Surface characterization techniques revealed the presence of micro-nanostructures on the produced silicone surfaces.

scholarly journals Improving Surface Hydrophobicity by Microrolling-Based Texturing

2016 ◽  
Vol 4 (3) ◽  
Author(s):  
Man-Kwan Ng ◽  
Ishan Saxena ◽  
Kornel F. Ehmann ◽  
Jian Cao
Keyword(s):  
Contact Angle ◽  
Volume Ratio ◽  
Surface Hydrophobicity ◽  
Contact Angles ◽  
Forming Process ◽  
Aluminum Sheets ◽  
Pile Up ◽  
Surface Contact Angle ◽  
Hierarchical Features ◽  
Aluminum Surfaces

A two-pass microrolling-based texturing (μRT) process was utilized to improve the hydrophobicity of aluminum surfaces. Square micropillars were fabricated on aluminum sheets by two mutually orthogonal forming passes by a roller pretextured with microgrooves. Subsequently, the droplet contact angle was measured to evaluate the hydrophobicity of the surface. Results show that surfaces with μRT-imprinted textures have higher contact angles than nontextured surfaces indicating improved hydrophobicity. Furthermore, the process has led to the creation of hierarchical valleylike features on top of each of the micropillars caused by the pile-up effect during the forming process. It was hypothesized that such hierarchical features positively contribute to the improved hydrophobicity of the surface. This hypothesis was validated by testing surfaces with a similar hierarchical textured pattern produced by laser-induced plasma micromachining (LIPMM). The effects of various aspects of texture geometry including surface area-to-volume ratio and groove aspect ratio on the surface contact angle and the anisotropy of the contact angles were investigated.

scholarly journals Modification of Surface Hydrophobicity of PLA/PE and ABS/PE Polymer Blends by ICP Etching and CFx Coating

Materials ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 5578
Author(s):  
Vedrana Lovinčić Milovanović ◽  
Cédric Guyon ◽  
Ivana Grčić ◽  
Michael Tatoulian ◽  
Domagoj Vrsaljko
Keyword(s):  
Contact Angle ◽  
3D Printing ◽  
Surface Morphology ◽  
Polymer Blends ◽  
Surface Properties ◽  
Surface Hydrophobicity ◽  
Contact Angles ◽  
Etching Time ◽  
Fused Filament Fabrication ◽  
Icp Etching

The flow regime inside the channel of 3D printed microreactors is defined by the surface properties of the channel walls. Polylactide (PLA) and acrylonitrile/butadiene/styrene (ABS) are two polymers that are the most common in additive manufacturing using fused filament fabrication, commonly known as “3D printing”. With the aim of developing new materials for the 3D printing of microreactors whose channel surface hydrophobicity could be modified, PLA and ABS were blended with cheaper and widely used polymers-high-density polyethylene (PE-HD) and low-density polyethylene (PE-LD). Polymer blend surfaces were treated with inductively coupled plasma (ICP) and coated by fluorocarbon-based material (CFx) plasma deposition treatment in order to modify surface hydrophobicity. It has been shown that the modification of surface morphology of PLA polymer blends can be achieved by ICP etching and CFx coating, while this was not possible for ABS polymer blends under the conducted treatment conditions. The treated surface of PLA/PE-HD 90/10 showed a contact angle of 121.6° which is 36° higher than the contact angle measured on the untreated surface. Surfaces that have achieved contact angles higher than 120° have an “island like” surface morphology. Samples with higher “islands” showed higher contact angles, that confirmed that the hydrophobicity also depends on the height of the “islands”. Furthermore, it has been found that etching time significantly impacts the contact angle values and surface morphology of the PLA polymer blends, while the CFx coating time does not have significant impact on the surface properties.

Study of Super Hydrophobic Films on Pre-Sensitized Plate Aluminium Substrate

2012 ◽  
Vol 200 ◽  
pp. 427-429
Author(s):  
Zhuang Liu ◽  
Lin Zhu ◽  
Jing Lin ◽  
Zhi Hui Sun
Keyword(s):  
Contact Angle ◽  
Rough Surface ◽  
Chemical Etching ◽  
Substrate Surface ◽  
Acid Etching ◽  
Etching Time ◽  
Hydrophobic Property ◽  
Aluminium Substrate ◽  
Simple Chemical ◽  
Etched Surface

A simple chemical etching method was developed for corrosion of the pre-sensitized plate aluminium substrate in order to be a rough surface. After the chemical etched surface was treated with fluorination, the pre-sensitized (PS) plate aluminium (Al) substrate surface exhibits a super-hydrophobic property. The effects of the etching time and the etchant concentration on the super-hydrophobici were investigated, and the results show the contact angle of hydrofluoric firstly increases then reduce with acid etching time increasing, and the optimum etching time is 12 min; the contact angle of hydrofluoric firstly increases then reduce with acid etchant concentration increasing, and the optimum etchant concentration is 3 mol /L. When the contact angle increases, the droplet and solid surface tension increases. Film base fine structure of the rough surface is the key to the formation of hydrophobic.

scholarly journals High Stability Performance of Superhydrophobic Modified Fluorinated Graphene Films on Copper Alloy Substrates

2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Rafik Abbas ◽  
N. Elkhoshkhany ◽  
Ahmed Hefnawy ◽  
Shaker Ebrahim ◽  
Aya Rahal
Keyword(s):  
Contact Angle ◽  
Water Contact Angle ◽  
Sliding Angle ◽  
Water Contact ◽  
Stability Performance ◽  
Graphene Films ◽  
Superhydrophobic Property ◽  
Self Cleaning ◽  
Fluorinated Graphene ◽  
Highly Hydrophobic

A stable self-cleaning superhydrophobic modified fluorinated graphene surface with micro/nanostructure was successfully fabricated on copper substrates via drop coating process. Irregularly stacked island-like multilayered fluorinated graphene nanoflakes comprised the microstructure. The fabricated films exhibited outstanding superhydrophobic property with a water contact angle 167° and water sliding angle lower than 4°. The developed superhydrophobic surface showed excellent corrosion resistance with insignificant decrease of water contact angle 166° in 3.5 wt.% NaCl solution. This stable highly hydrophobic performance of the fluorinated graphene films could be useful in self-cleaning, antifogging, corrosion resistive coatings and microfluidic devices.

scholarly journals Characterization of Si nanowires synthesized using metal-assisted wet-chemical etching

2014 ◽  
Vol 8 (3) ◽  
Author(s):  
Eman S. M. Ashour ◽  
M.Y. Sulaiman ◽  
N. Amin ◽  
Z. Ibrahim
Keyword(s):  
Silicon Nanowires ◽  
Chemical Etching ◽  
Growth Parameters ◽  
Silicon Nanowire ◽  
Incident Light ◽  
Nanowire Array ◽  
Solution Concentration ◽  
Etching Time ◽  
Si Nanowires ◽  
Potential Applications

A synthesis of vertical silicon nanowire array through metal-assisted chemical etching of highly doped p-type silicon wafers (100) in a solution of hydrofluoric acid and silver nitrate has been proposed. . The influences of the growth parameters such as solution concentration, etching time have been investigated. In addition, we consider other common parameters like wafer resistivity and temperature, which rely on the silicon nanowires formation. The results indicate that the silicon nanowires retain the single crystalline structure and crystallographic orientation of the starting silicon wafer. Furthermore, They provide excellent antireflection property with a low reflection loss of 3% for incident light within the wavelength range of 200–900 nm. Such nanowire arrays may have potential applications as antireflection surface for silicon solar cells

Fabrication of superhydrophobic and conductive CNT/KB/PBZ nanocomposites

2016 ◽  
Vol 29 (8) ◽  
pp. 937-942 ◽  
Author(s):  
Yan Liu ◽  
Yean Zhu ◽  
Dingzhong Yuan
Keyword(s):  
Contact Angle ◽  
Sheet Resistance ◽  
Sliding Angle ◽  
Water Contact ◽  
Conductive Coatings ◽  
Ph Values ◽  
Wide Range ◽  
Morphology And Structure ◽  
The Relationship ◽  
Excellent Stability

In this study, a simple and economical fabrication of superhydrophobic and conductive coatings with different loadings of carbon nanotubes (CNTs) and Ketjen black (KB) dispersed in polybenzoxazine (PBZ) solution is presented. The relationship between the ratio of CNT, KB and PBZ with the properties of the composites was investigated in this article. The morphology and structure of the obtained composites were characterized by scanning electron microscopy, the water contact angle (WCA) and sheet resistance were investigated using a contact angle goniometer and four-point probe technique. Loading different amounts of CNT, KB and PBZ allowed the composites to exhibit different degrees of hydrophobicity and conductivity. Interestingly, a synergistic effect has been observed between CNT and KB. It was found that the coatings containing CNT:KB:PBZ = 4:6:10 showed both the highest WCA (about 160°), lowest sliding angle (about 3°) and lowest sheet resistance, which can reach approximately 6.5 × 102 Ω/sq. Furthermore, the CNT/KB/PBZ nanocomposites have excellent stability under a wide range of pH values and different environmental conditions.

scholarly journals Structure and Properties of Hydrophobic Aggregation Hydrogel with Chemical Sensitive Switch

2017 ◽  
Vol 2017 ◽  
pp. 1-5 ◽  
Author(s):  
Jiufang Duan ◽  
Jianxin Jiang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Contact Angle ◽  
Weight Loss ◽  
Control Release ◽  
Structure And Properties ◽  
Maximum Value ◽  
Potential Applications ◽  
Hydrophobic Aggregation ◽  
Scanning Electron

Hydrogels with chemical sensitive switch have control release properties in special environments. A series of polyacrylamide-octadecyl methacrylate hydrogels crosslinked by N,N′-bis (acryloyl) cystamine were synthesized as potential chemical sensitive system. When this hydrogel encounters dithiothreitol it can change its quality. The properties of the hydrogels were characterized by infrared spectroscopy, contact angle, and scanning electron microscopy. The water absorption of the hydrogel has the maximum value of 475%, when the content of octadecyl methacrylate is 5 wt%. The amount of weight loss was changed from 34.6% to 17.2%, as the content of octadecyl methacrylate increased from 3 wt% to 9.4 wt%. At the same time, the stress of the hydrogel decreased from 67.01% to 47.61%; the strength of the hydrogel reaches to the maximum 0.367 Mpa at 7 wt% octadecyl methacrylate. The increasing content of octadecyl methacrylate from 3 wt% to 9.4 wt% can enhance the hydrophobicity of the hydrogel; the contact angle of water to hydrogel changed from 14.10° to 19.62°. This hydrogel has the porous structure which permits loading of oils into the gel matrix. The functionalities of the hydrogel make it have more widely potential applications in chemical sensitive response materials.

Superhydrophobic Film Make up of Corrosion Aluminum Plates and Polypropylene Coated

2013 ◽  
Vol 734-737 ◽  
pp. 2519-2522
Author(s):  
Ruo Mei Wu ◽  
Guang Hua Chao ◽  
Hai Yun Jiang ◽  
Hong Chen ◽  
Qi Long Liu
Keyword(s):  
Contact Angle ◽  
Aluminum Alloy ◽  
Superhydrophobic Surface ◽  
Surface Hydrophobicity ◽  
Aluminum Surface ◽  
Water Contact ◽  
Low Surface Energy ◽  
Special Surface ◽  
Superhydrophobic Property ◽  
Aluminum Plates

Polypropylene (PP) film was used as coating to improve the hydrophobicity of corrosive aluminum surface. A micro-porous film with compound nanoparticles was obtained on the aluminum alloy substrate using the corrosion method and coated PP. The water contact angle (WCA) of superhydrophobic surface is 157°. The superhydrophobic property is attributed to this special surface morphology and low surface energy PP. Aggregated nanoparticles would help to increase the surface hydrophobicity.

Fabrication and Characterization of CuO Micro-Dimensional Structures for Superhydrophobic Surface

2014 ◽  
Vol 936 ◽  
pp. 233-237
Author(s):  
You Hua Fan ◽  
Ze Jun Chen ◽  
La Yun Deng ◽  
Hong Chen
Keyword(s):  
Contact Angle ◽  
Superhydrophobic Surface ◽  
Morphological Study ◽  
Copper Substrate ◽  
Sliding Angle ◽  
Water Contact ◽  
Synthesis Conditions ◽  
Superhydrophobic Property ◽  
Fabrication And Characterization

A superhydrophobic copper oxygen (CuO) surface with hierarchical micro- and nanostructure was obtained by hydrothermally synthesized. The CuO surface was endowed with superhydrophobic property by modifying with stearic acid, which was referred to the STA-modified CuO film. The surface morphological study showed that different structures, such as petal-shaped, bulk-shaped, carambola-shaped CuO and cauliflower-shaped particles distributed on the copper substrate under the different synthesis conditions. The water contact angle and sliding angle of the as-prepared CuO surface were 157 ± 2.3º and 3º, respectively.

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