scholarly journals Superhydrophobic Surface by Replication of Laser Micromachined Pattern in Epoxy/Alumina Nanoparticle Composite

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
Maciej Psarski ◽  
Jacek Marczak ◽  
Jarosław Grobelny ◽  
Grzegorz Celichowski
Keyword(s):  
Surface Topography ◽  
Plasma Etching ◽  
Superhydrophobic Surface ◽  
Preparation Method ◽  
Nanosecond Laser ◽  
Air Plasma ◽  
Sliding Angle ◽  
Water Contact ◽  
Wet Chemical ◽  
Nanoparticle Agglomerates

Superhydrophobic surfaces were obtained by superposition of microstructure—defined by replication of laser micromachined masters, with nanostructure—created by durable epoxy/γ-Al2O3nanoparticle composite, used for replication. Hierarchical surface topography thus obtained consisted of hexagonally spaced microcavities and nanoparticle agglomerates, exposed on the replica surface by radio frequency (RF) air plasma etching. Surface topography was further enhanced by rims around the microcavity edges, resulting from nanosecond laser micromachining defects in aluminum masters. Subsequent wet chemical hydrophobization with 1H,1H,2H,2H-perfluorotetradecyltriethoxysilane (PFTDTES) provided superhydrophobic behavior in replicas with a microcavity spacing of 30 μm, as indicated by a water contact angle of 160° and a sliding angle of 8°. The preparation method is relatively simple, inexpensive, and potentially scalable.

Fabrication of a Superhydrophobic Aluminum Alloy Surface by Phosphoric Acid-Dichromate Method

2013 ◽  
Vol 312 ◽  
pp. 350-353
Author(s):  
Ruo Mei Wu ◽  
Guang Hua Chao ◽  
Hai Yun Jiang
Keyword(s):  
Aluminum Alloy ◽  
Phosphoric Acid ◽  
Superhydrophobic Surface ◽  
Preparation Method ◽  
Sliding Angle ◽  
Water Contact ◽  
Static Water Contact Angle ◽  
Static Water ◽  
Acid Coating ◽  
Aluminum Alloy Surface

The preparation method of the superhydrophobic surface on aluminum alloys was investigated, the method is novel by phosphoric acid-dichromate process and stearic acid coating, superhydrophobic aluminum alloy surfaces were successful prepared, the maximum static water contact angle and sliding angle on the superhydrophobic surface was 151±1.8° and 10°, respectively. In this work, the microstructure and self-cleaning properties of the superhydrophobic surface were studied. The superhydrophobic surface is a factor to reduce device-associated contamination and can be used in metal packaging practice.

scholarly journals Fabrication of superhydrophobic surface of stearic acid grafted zinc by using an aqueous plasma etching technique

2012 ◽  
Vol 10 (6) ◽  
pp. 1766-1772 ◽  
Author(s):  
Jinzhang Gao ◽  
Yaping Li ◽  
Yan Li ◽  
Hongwei Liu ◽  
Wu Yang
Keyword(s):  
Stearic Acid ◽  
Plasma Etching ◽  
Superhydrophobic Surface ◽  
X Ray Diffraction ◽  
Sliding Angle ◽  
Etching Technique ◽  
Water Contact ◽  
X Ray ◽  
Zinc Surface ◽  
Glow Discharge Electrolysis Plasma

AbstractA stable superhydrophobic surface of stearic acid grafted zinc was fabricated with two steps, that is, the zinc surface was firstly treated with glow discharge electrolysis plasma (GDEP) and then followed by a grafted reaction of stearic acid onto the treated zinc surface. Results indicated that the wettability of zinc substrate changed from superhydrophily to superhyphodrobicity with a water contact angle (CA) up to 158° and a water sliding angle (SA) less than 5°. The surface morphology and composition were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD), respectively.

scholarly journals A Durable and Self-Cleaning Superhydrophobic Surface Prepared by Precipitating Flower-Like Crystals on a Glass-Ceramic Surface

Materials ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1642
Author(s):  
Haiqing Fu ◽  
Shuo Liu ◽  
Lanlin Yi ◽  
Hong Jiang ◽  
Changjiu Li ◽  
...  
Keyword(s):  
Glass Ceramic ◽  
Superhydrophobic Surface ◽  
Three Dimensional ◽  
Strong Acid ◽  
Ceramic Surface ◽  
Sliding Angle ◽  
Water Contact ◽  
Prepared Glass ◽  
Self Cleaning ◽  
Dual Scale

Herein, a superhydrophobic surface with superior durability was fabricated on a glass-ceramic surface by crystallization, hydrofluoric acid (HF) etching, and surface grafting. The as-prepared glass-ceramic surface was composed of three-dimensional flower-like micro-clusters, which were self-assembled from numerous nanosheets. Such a dual-scale rough surface exhibited superhydrophobicity, with a water contact angle (WCA) of 170.3° ± 0.1° and a sliding angle (SA) of ~2° after grafting with 1H, 1H, 2H, 2H-perfluorodecyltriethoxysilane (FAS-17). This can be attributed to the synergistic effect between the dual-scale structure and surface chemistry. Furthermore, this surface exhibited excellent self-cleaning properties, stability against strong acid and strong alkali corrosion, and anti-stripping properties.

scholarly journals Superhydrophobic Surface with Gamma Irradiation Resistance and Self-Cleaning Effect in Air and Oil

Coatings ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 106 ◽  
Author(s):  
Yan Zhang ◽  
Jing Zhang ◽  
Yujian Liu
Keyword(s):  
Superhydrophobic Surface ◽  
Water Repellency ◽  
Sio2 Nanoparticles ◽  
Superior Performance ◽  
Sliding Angle ◽  
Water Contact ◽  
Composite Surface ◽  
Static Water Contact Angle ◽  
Static Water ◽  
Dirt Removal

A superhydrophobic surface was synthesized by a combination of an epoxy/polymethylphenylsiloxane matrix and dual-scale morphology of silica (SiO2) nanoparticles. When the amount of SiO2 reached 30 wt.%, the as-prepared surface showed a high static water contact angle (WCA) of 154° and a low sliding angle (SA) of 5°, excellent water repellency, and dirt-removal effects both in air and oil (hexamethylene). Even after exposure to as high as a 12.30 Mrad dose of gamma-rays, the composite surface still maintained its superior performance.

scholarly journals Fabrication of a Low Adhesive Superhydrophobic Surface on Ti6Al4V Alloys Using TiO2/Ni Composite Electrodeposition

Micromachines ◽  
2019 ◽  
Vol 10 (2) ◽  
pp. 121 ◽  
Author(s):  
Jianbing Meng ◽  
Xiaojuan Dong ◽  
Yugang Zhao ◽  
Rufeng Xu ◽  
Xue Bai ◽  
...  
Keyword(s):  
Contact Angle ◽  
Wear Resistance ◽  
Superhydrophobic Surface ◽  
Ph Value ◽  
Chemical Compositions ◽  
Sliding Angle ◽  
Water Contact ◽  
Angle Measurements ◽  
Surface Morphologies ◽  
Composite Electrodeposition

A superhydrophobic surface with low adhesion and good wear resistance was fabricated on Ti6Al4V substrates via TiO2/Ni composite electrodeposition, and subsequently modified with a fluoroalkylsilane (FAS) film. Scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and optical contact angle measurements were used to characterize the surface morphologies, chemical compositions, and surface wettability. The superhydrophobicity of the as-prepared surface results from the fabrication of a hierarchical structure and the assembly of low-surface energy fluorinated components. The as-prepared surface had a water contact angle as high as 162.6° and a sliding angle close to 1.8°. Scratch and abrasion tests showed that the superhydrophobic coating provided a superior wear resistance and stable mechanical abrasion protection. In addition, the influence of processing conditions, such as working voltage, deposited time, pH value, and TiO2 concentration, was also investigated.

scholarly journals Fabrication of Self-Cleaning Superhydrophobic Surfaces with Improved Corrosion Resistance on 6061 Aluminum Alloys

Micromachines ◽  
2020 ◽  
Vol 11 (2) ◽  
pp. 159 ◽  
Author(s):  
Xiaojuan Dong ◽  
Jianbing Meng ◽  
Yizhong Hu ◽  
Xiuting Wei ◽  
Xiaosheng Luan ◽  
...  
Keyword(s):  
Contact Angle ◽  
Corrosion Resistance ◽  
Aluminum Alloy ◽  
Aluminum Alloys ◽  
Superhydrophobic Surface ◽  
Al Alloy ◽  
Alloy Sample ◽  
Sliding Angle ◽  
Water Contact ◽  
Self Cleaning

Aluminum alloys are widely used, but they are prone to contamination or damage under harsh working environments. In this paper, a self-cleaning superhydrophobic aluminum alloy surface with good corrosion resistance was successfully fabricated via the combination of sand peening and electrochemical oxidation, and it was subsequently covered with a fluoroalkylsilane (FAS) film. The surface morphology, surface wettability, and corrosion resistance were investigated using a scanning electron microscope (SEM), an optical contact angle measurement, and an electrochemical workstation. The results show that binary rough structures and an FAS film with a low surface energy on the Al alloy surfaces confer good superhydrophobicity with a water contact angle of 167.5 ± 1.1° and a sliding angle of 2.5 ± 0.7°. Meanwhile, the potentiodynamic polarization curve shows that the corrosion potential has a positively shifted trend, and the corrosion current density decreases by three orders of magnitude compared with that of the original aluminum alloy sample. In addition, the chemical stability of the as-prepared superhydrophobic surface was evaluated by dripping test using solutions with different pH values for different immersion time. It indicates that the superhydrophobic surface could provide long-term corrosion protection for aluminum alloys. Consequently, the as-prepared superhydrophobic surface has excellent contamination resistance and self-cleaning efficacy, which are important for practical applications.

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.

Preparation and Characterization of Nickel Oxide-Based Superhydrophobic Surface

2012 ◽  
Vol 557-559 ◽  
pp. 1807-1810 ◽  
Author(s):  
Zhi Qing Yuan ◽  
Xi Hai Hao ◽  
Ji Ping Bin ◽  
Xian Wang ◽  
Hong Chen
Keyword(s):  
Contact Angle ◽  
Aqueous Solutions ◽  
Nickel Oxide ◽  
Superhydrophobic Surface ◽  
Water Surface ◽  
Pure Water ◽  
Sliding Angle ◽  
Water Contact ◽  
Superhydrophobic Property

A superhydrophobic nickel oxide (NiO) surface with hierarchical micro- and nanostructures was obtained by a novel and facile method. The water contact angle and sliding angle of the superhydrophobic NiO surface were 156±1.9º and 3º, respectively. The superhydrophobic NiO surface made the substrate float on the water surface and showed high buoyancy. Execept for pure water, the superhydrophobicity of the superhydrophobic NiO surface remained unchanged when contacting with salt aqueous solutions. After being stored in ambient environment for 8 months, the superhydrophobic property remained constant, and no contamination was observed on the superhydrophobic NiO surface.

Preparation of Superhydrophobic Surface on Copper Foils by a Facile Method

2013 ◽  
Vol 834-836 ◽  
pp. 42-45
Author(s):  
Zhi Qing Yuan ◽  
Xian Wang ◽  
Ji Ping Bing ◽  
Meng Lei Wang ◽  
Juan Huang
Keyword(s):  
Contact Angle ◽  
Superhydrophobic Surface ◽  
Solution Concentration ◽  
Copper Surface ◽  
Ethanol Solution ◽  
Superhydrophobic Surfaces ◽  
Sliding Angle ◽  
Water Contact ◽  
Copper Foils ◽  
Immersing Method

In the paper, we prepared superhydrophobic surfaces on copper foils via a facile solution-immersing method. The influence of experiment conditions, such as solution concentration, immersing time and temperature, on the surface structure is investigated in detail. When the concentration of stearic acid-ethanol solution, the immersing time and the temperature are 2 g/L, 120 min and 40°,respectively, the resulting copper surface possesses great superhydrophobicity with a water contact angle of up to 159° and a sliding angle of only 3°.

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