scholarly journals A Simple and Efficient Method to Fabricate Superhydrophobic Wood with Enhanced Mechanical Durability

Forests ◽  
2019 ◽  
Vol 10 (9) ◽  
pp. 750 ◽  
Author(s):  
Han ◽  
Wang ◽  
Zhang ◽  
Pu
Keyword(s):  
Large Scale ◽  
Sio2 Nanoparticles ◽  
Contact Angles ◽  
Superhydrophobic Surfaces ◽  
High Wear Resistance ◽  
Mechanical Resistance ◽  
Water Contact ◽  
Mechanical Durability ◽  
One Step ◽  
Efficient Route

The poor durability and complex production process are two tough challenges for the practical application of superhydrophobic wood. In this work, high-mechanical-resistance superhydrophobic wood was fabricated by a one-step hydrothermal vacuum dipping method using SiO2 nanoparticles (SiO2 NPs) in combination with vinyltriethoxysilane (VTES). The as-prepared superhydrophobic surfaces exhibited water contact angles (CAs) greater than 152° and water sliding angles (SAs) less than 3°. It also exhibited robust stability and durability in harsh conditions, including finger wiping, water brushing, intense sandpaper abrasion, and severe ultrasonic cleaning. The superhydrophobic surface was created by the random distribution of oligomer-wrapped SiO2 NP spheres having different sizes. Further testing showed that the SiO2 NPs were firmly fixed on the wood substrate via chemical bonding, which contributed to the high wear resistance. The modification method developed in this work provides a simple and efficient route to fabricate large-scale, mechanically stable, and durable superhydrophobic surfaces for advanced engineering materials.

scholarly journals Facile Approach to Develop Hierarchical Roughness fiber@SiO2 Blocks for Superhydrophobic Paper

Materials ◽  
2019 ◽  
Vol 12 (9) ◽  
pp. 1393 ◽  
Author(s):  
Qing Wang ◽  
Jieyi Xiong ◽  
Guangxue Chen ◽  
Ouyang Xinping ◽  
Zhaohui Yu ◽  
...  
Keyword(s):  
Large Scale ◽  
Low Cost ◽  
Sol Gel ◽  
Sio2 Nanoparticles ◽  
Contact Angles ◽  
Preparation Process ◽  
Water Contact ◽  
Mechanical Durability ◽  
Complex Preparation ◽  
Superhydrophobic Paper

Papers with nanoscaled surface roughness and hydrophobically modification have been widely used in daily life. However, the relatively complex preparation process, high costs and harmful compounds have largely limited their applications. This research aims to fabricate superhydrophobic papers with low cost and nontoxic materials. The surface of cellulose fibers was initially coated with a film of SiO2 nanoparticles via sol-gel process. After papermaking and subsequent modification with hexadecyltrimethoxysilane through a simple solution-immersion process, the paper showed excellent superhydrophobic properties, with water contact angles (WCA) larger than 150°. Moreover, the prepared paper also showed superior mechanical durability against 10 times of deformation. The whole preparation process was carried out in a mild environment, with no intricate instruments or toxic chemicals, which has the potential of large-scale industrial production and application.

An Easy Approach for Obtaining Superhydrophobic Surfaces and their Applications

2019 ◽  
Vol 813 ◽  
pp. 37-42
Author(s):  
Amani Khaskhoussi ◽  
Luigi Calabrese ◽  
Edoardo Proverbio
Keyword(s):  
Surface Morphology ◽  
Large Scale ◽  
Adhesion Force ◽  
Industrial Applications ◽  
Contact Angles ◽  
Boiling Water ◽  
Superhydrophobic Surfaces ◽  
Acid Mixture ◽  
Short Term Treatment ◽  
Water Contact

Three different methods were used to obtain nature-inspired superhydrophobic surfaces on aluminum alloys: short-term treatment with boiling water, HF/HCl and HNO3/HCl concentrated solution etching. Afterwards a thin octadecylsilane film was deposited on all pre-treated surfaces. The surface morphology analysis showed that each method allow to obtain a specific dual nano/micro-structure. The corresponding water contact angles ranged from 160° to nearly 180°. The adhesion force between the water droplets and superhydrophobic surfaces were evaluated. The specimen etched with HF/HCl acid mixture solution showed the lowest adhesion. However, the boiling water treatment sample was characterized by the highest adhesion. Furthermore, the relationship between hydrophobic behavior and surface morphology was discussed compressively. In addition, the electrochemical measurements show that the different superhydrophobic surfaces have an excellent anti-corrosion performance evidencing promising results suitable to obtain large-scale nature-inspired superhydrophobic surfaces for several industrial applications.

scholarly journals One-Step Preparation of Durable Super-Hydrophobic MSR/SiO2 Coatings by Suspension Air Spraying

Micromachines ◽  
2018 ◽  
Vol 9 (12) ◽  
pp. 677 ◽  
Author(s):  
Zhengyong Huang ◽  
Wenjie Xu ◽  
Yu Wang ◽  
Haohuan Wang ◽  
Ruiqi Zhang ◽  
...  
Keyword(s):  
Contact Angle ◽  
Adhesion Strength ◽  
Contact Angle Hysteresis ◽  
Surface Hardness ◽  
Hierarchical Structures ◽  
Hydrophobic Surface ◽  
Water Contact ◽  
Hydrophobic Coating ◽  
Mechanical Durability ◽  
One Step

In this study, we develop a facial one-step approach to prepare durable super-hydrophobic coatings on glass surfaces. The hydrophobic characteristics, corrosive liquid resistance, and mechanical durability of the super-hydrophobic surface are presented. The as-prepared super-hydrophobic surface exhibits a water contact angle (WCA) of 157.2° and contact angle hysteresis of 2.3°. Mico/nano hierarchical structures and elements of silicon and fluorine is observed on super-hydrophobic surfaces. The adhesion strength and hardness of the surface are determined to be 1st level and 4H, respectively. The coating is, thus, capable of maintaining super-hydrophobic state after sand grinding with a load of 200 g and wear distances of 700 mm. The rough surface retained after severe mechanical abrasion observed by atomic force microscope (AFM) microscopically proves the durable origin of the super-hydrophobic coating. Results demonstrate the feasibility of production of the durable super-hydrophobic coating via enhancing its adhesion strength and surface hardness.

Fabrication of Self-Healable, Robust Superhydrophobic Surfaces Using UV-Crosslinked Nanocomposite Films

2021 ◽  
Vol 21 (12) ◽  
pp. 6212-6216
Author(s):  
Yeon-Ah Park ◽  
Young-Geun Ha
Keyword(s):  
Low Cost ◽  
Synergetic Effect ◽  
Spray Coating ◽  
Uv Curing ◽  
Industrial Applications ◽  
Contact Angles ◽  
Superhydrophobic Surfaces ◽  
Nanocomposite Films ◽  
Self Healing ◽  
Water Contact

Studies on fabricating robust superhydrophobic surfaces by a low-cost method have been rare, despite the recent demand for nature-inspired superhydrophobic surfaces including self-healing ability in various industrial applications. Herein, we propose a fabrication method for self-healable, robust superhydrophobic nanocomposite films by facile solution-processed spray coating and UV curing. The components of the coating solution include functionalized hydrophobic silica nanoparticles for producing high roughness hierarchical textured structures with low surface energy, and UV-crosslinkable v-POSS and bi-thiol hydrocarbon molecules to improve the film stability. As a result of the synergetic effect of the hydrophobic nanoparticles and UV-crosslinked polymeric compounds, the spray-coated and UV-cured nanocomposite films possess excellent superhydrophobicity (water contact angles > 150º) and high stability, in addition to self-healing abilities.

scholarly journals Waterborne Acrylate-Based Hybrid Coatings with Enhanced Resistance Properties on Stone Surfaces

Coatings ◽  
2018 ◽  
Vol 8 (8) ◽  
pp. 283 ◽  
Author(s):  
Francesca Sbardella ◽  
Lucilla Pronti ◽  
Maria Santarelli ◽  
José Asua Gonzàlez ◽  
Maria Bracciale
Keyword(s):  
Oxidation Resistance ◽  
Building Materials ◽  
Silica Nanoparticle ◽  
Sio2 Nanoparticles ◽  
Hybrid Coatings ◽  
Mechanical Resistance ◽  
Accelerated Weathering ◽  
Coating Materials ◽  
Water Contact ◽  
Photo Oxidation

The application of coating polymers to building materials is a simple and cheap way to preserve and protect surfaces from weathering phenomena. Due to its environmentally friendly character, waterborne coating is the most popular type of coating, and improving its performance is an important key of research. The study presents the results regarding the mechanical and photo-oxidation resistance of some water-based acrylic coatings containing SiO2 nanoparticles obtained by batch miniemulsion polymerization. Coating materials have been characterized in terms of hydrophobic/hydrophilic behavior, mechanical resistance and surface morphology by means of water-contact angle, and scrub resistance and atomic force microscopy (AFM) measurements depending on silica-nanoparticle content. Moreover, accelerated weathering tests were performed to estimate the photo-oxidation resistance of the coatings. The chemical and color changes were assessed by Fourier-transform infrared spectroscopy (FTIR) and colorimetric measurements. Furthermore, the nanofilled coatings were applied on two different calcareous lithotypes (Lecce stone and Carrara Marble). Its properties, such as capillary water absorption and color modification, before and after accelerated aging tests, were assessed. The properties acquired by the addition of silica nanoparticles in the acrylic matrix can ensure good protection against weathering of stone-based materials.

Fabrication of Superhydrophobic Surfaces on Copper Substrates via Brush Plating Technique

2013 ◽  
Vol 834-836 ◽  
pp. 662-669 ◽  
Author(s):  
Ke Hu ◽  
Quan Xin Xu ◽  
Xiao Long Yang
Keyword(s):  
Large Scale ◽  
Superhydrophobic Surfaces ◽  
Scale Production ◽  
Sliding Angle ◽  
Water Contact ◽  
Copper Surfaces ◽  
Plating Technique ◽  
Large Scale Production ◽  
Sample Technique ◽  
Brush Plating

Superhydrophobic surfaces on metal substrates are often prepared via roughing the surfaces and lowering their surface energy. Composite brush plating technique is developed to prepare superhydrophobic n-SiO2/Ni brush plating composite coating on copper surfaces. Under the better process parameters, the water contact angle of the obtained superhydrophobic surface is approximately 160°, and the water sliding angle is less than 10°. The influences of plating voltage and plating time on the coating surface structure and hydrophobicity were discussed. The surface morphology and chemical composition were characterized by scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS).The results show that the prepared surfaces have the appearance of the uniform micron papilla-like structures, which are composed of submicron globular Ni particles covered with n-SiO2nanoscale villiform structures. These hierarchical micro/nanostructures are similar to the lotus leaf and play an important role in gaining superhydrophobicity. It is expected that this sample technique will be widely used for large-scale production of superhydrophobic engineering materials.

Fabrication of Super Water-Repellent Surfaces by Nanosphere Lithography

2004 ◽  
Vol 823 ◽  
Author(s):  
Jau-Ye Shiu ◽  
Chun-Wen Kuo ◽  
Peilin Chen ◽  
Chung-Yuan Mou
Keyword(s):  
Plasma Etching ◽  
Oxygen Plasma ◽  
Nanosphere Lithography ◽  
Contact Angles ◽  
Adjustable Parameter ◽  
Superhydrophobic Surfaces ◽  
Water Repellent ◽  
Water Contact ◽  
Polystyrene Nanospheres ◽  
Plant Surfaces

Abstract: Inspired by the water-repellent behavior of the micro- and nano-structured plant surfaces, superhydrophobic materials, with a water contact larger than 150° superhydrophobic surfaces using a combination of nanosphere lithography and plasma etching. It has been found that the water contact angle on these surfaces can be systematically tuned from 132° to 168° by trimming the diameters of polystyrene nanospheres using oxygen plasma. The water contact angles measured on these surfaces can be modeled by the Cassie's formulation without any adjustable parameter.

scholarly journals Inexpensive and non-toxic water repellent coatings comprising SiO2 nanoparticles and long chain fatty acids

RSC Advances ◽  
2018 ◽  
Vol 8 (48) ◽  
pp. 27064-27072 ◽  
Author(s):  
Frances L. Heale ◽  
Kristopher Page ◽  
James S. Wixey ◽  
Philip Taylor ◽  
Ivan P. Parkin ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Silica Nanoparticles ◽  
Sio2 Nanoparticles ◽  
Contact Angles ◽  
Water Repellent ◽  
Long Chain Fatty Acids ◽  
Water Contact ◽  
Hydrophobic Silica ◽  
Long Chain ◽  
Chain Fatty Acids

Special wettability durable coatings, with water contact angles exceeding 140°, have been fabricated using inexpensive and non-toxic functionalised hydrophobic-silica nanoparticles embedded in fatty acids.

scholarly journals Nanofabrication of Diamond-like Carbon Templates for Nanoimprint Lithography

2006 ◽  
Vol 956 ◽  
Author(s):  
L. Tao ◽  
S. Ramachandran ◽  
C. T. Nelson ◽  
L. J. Overzet ◽  
M. J. Goeckner ◽  
...  
Keyword(s):  
Surface Energy ◽  
Nanoimprint Lithography ◽  
Inductively Coupled Plasma ◽  
Chemical Vapor ◽  
Contact Angles ◽  
Angle Measurement ◽  
High Wear Resistance ◽  
Diamond Like Carbon ◽  
Water Contact ◽  
Low Surface Energy

ABSTRACTDiamond like carbon (DLC) films were deposited on Si and then patterned to form 40 nm features as nanoimprint templates. A plasma enhanced chemical vapor deposition (PECVD) system with CH4 precursor was used to deposit DLC films on Si and quartz substrates. Then these films were characterized using Raman spectroscopy, atomic force microscopy (AFM), nanoindentation, and contact angle measurement. By varying the RF power and pressure of the PECVD, DLC films with good uniformity, smooth surfaces (<0.2 nm RMS), low surface energy (∼40 mJ/m2), and high hardness (∼22 GPa) were achieved. Nanoimprint lithography and liftoff process were used to pattern Cr mask on DLC films. An inductively coupled plasma (ICP) etching process was performed with CF4 to transfer the patterns into the DLC films to form nanostructured template for nanoimprint. Water contact angles on the patterned DLC templates were measured and it was stable at about 70° under thermal annealing at 180 °C for more than 12 hours. With these DLC templates, UV and reversal UV nanoimprint lithography were carried out on SU-8 at typical imprint conditions and then the fidelity of pattern-transfer was investigated. These experimental results indicate that DLC is an excellent material for nanoimprint templates because of its high wear resistance, robust low surface energy, UV transparency, and ease of patterning.

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