Sandpaper Abrasion Research Articles

Superhydrophobic finishing of cotton fabric via nonsolvent-induced phase separation of polystyrene–perfluoropolyether block copolymer

This paper reports synthesis of polystyrene–perfluoropolyether block copolymer@cotton fabric (PS–PFPE@CF) with a rough structure through nonsolvent-induced phase separation. The factors affecting the hydrophobicity of the coating, such as solvent quality, the molecular weight of the PS segments, and the volume ratio of tetrahydrofuran/1,3-di(trifluoromethyl)benzene (THF/DTFMB) and THF–MeOH, were all investigated, and the relation between the coating structure and hydrophobicity was also analyzed. In the THF–DTFMB system, PS–PFPE@CF (4 h, 80 mg/mL) appeared as a secondary structure with the superposition of small spheres on large spheres. For this structure, the water-contact angle reached 156.2° ± 0.5° and the sliding angle was 9.5° ± 1.5°. Furthermore, scanning electron microscopy, energy-dispersive X-ray spectroscopy, atomic force microscopy, and thermogravimetric analysis confirmed that PS–PFPE coated the cotton fabric. Finally, application tests were performed to assess the application prospects of PS–PFPE@CF. Oil-water separation, self-cleaning, and antifouling applications were studied, and the experimental results showed that the separation efficiency of the superhydrophobic fabric was nearly constant, from 99.4 % to 98.3 % after 10 oil-water separation tests. PS–PFPE@CF exhibited excellent self-cleaning properties and performed well in the sandpaper abrasion and tape peeling tests. This research thus used a degradable PFPE block copolymer to produce cotton fabrics with excellent hydrophobicity, self-cleaning, and wear resistance.

Fabrication of robust superhydrophobic myristic acid/ZrO2 coating with improved anti-icing and anti-corrosion for concrete via a two-step method

To address the safety concerns associated with icing and corrosion of concrete-based facilities, a facile two-step process of sandpaper covering and spraying for fabricating a robust superhydrophobic myristic acid/ZrO2 coating (MAZ-RSC) on concrete surface was proposed. Sandpaper covering and ZrO2 modified with myristic acid were used to fabricate the superhydrophobic structure. An analysis of the resultant superhydrophobic concrete's surface morphology and chemical structure was performed. The formation mechanism of the obtained MAZ-RSC was discussed. Results indicate that the MAZ-RSC coating exhibited superior superhydrophobic and self-cleaning properties with a contact angle of 161.3° and a sliding angle of 1.2°. The robust ability of the as-prepared MAZ-RSC coating was assessed through knife scratching, tape peeling, and sandpaper abrasion. The presence of ZrO2 enabled the MAZ-RSC to be a superhydrophobic hard coating. Meanwhile, the prepared coating was proven to possess a good active anti-icing ability and a strong anti-corrosion ability and to be easily de-iced. Further tests show that this coating can maintain excellent chemical resistance across a broad pH range because of its superior hydrophobicity and the chemical inertness of the ZrO2 particles. Thus, the as-prepared coating is expected to be adopted in practical areas such as roads, buildings and bridges.

Preparation of superhydrophobic coatings on kraft paper for the protection of important documents

Kraft paper (KP) has the advantages of being biodegradable, recyclable, and environmentally friendly. It has a wide range of applications in paper packaging, food packaging, and other fields. However, the non-waterproof characteristic of KP limits its application in harsh environments or special paper packaging, etc. To solve the problem of poor water resistance of KP, a simple and efficient method is proposed to prepare superhydrophobic coatings on kraft paper (SKP) by spraying method using hydrophobic Nano-calcium carbonate (Nano-CaCO3) particles and rosin (RA) as raw materials. Here, the micro-nano structures are mainly constructed by hydrophobic Nano-CaCO3 particles, and RA is utilized as a binder to improve the adhesion between the nanoparticles and the paper. The results indicated that the water contact angle (WCA) of SKP reached 154.5° and the water sliding angle (WSA) was 3.2°. And after 34 h of immersion in water, the WCA of SKP surface can remain above 150°. It can also withstand 30 times of sandpaper abrasion and 30 times of tape peeling. Overall, SKP shows excellent stability, water resistance, stain resistance and self-cleaning. It is expected to protect important documents in harsh environments.

Preparation of Durable Superhydrophobic Coatings Based on Discrete Adhesives

Due to the low adhesion observed at the interface between solid and liquid, superhydrophobic coatings hold significant promise for various applications, such as self-cleaning, anti-corrosion, anti-icing, and drag reduction. However, a notable challenge hindering their widespread adoption in these domains lies in their delicate durability. In this study, we propose a straightforward method for preparation. The fluorosilicone resin is initially discretized through a gradual introduction of nonsolvent into its solution, followed by thorough mixing and stirring with silica nanoparticles. The resulting mixture is then sprayed onto the substrate surface after drying, forming a self-similar, porous, and rough structure extending from top to bottom. This process yields a coating exhibiting excellent chemical and mechanical durability simultaneously. Using this approach, we achieved a superhydrophobic coating with a contact angle of 156° and a roll angle of 2.2°, with water droplet adhesion of only 10.8 ± 0.4 µN. Remarkably, the coating maintained excellent superhydrophobicity even after undergoing sandpaper abrasion (10 m), tape peeling (30 times), and prolonged water impact (60 min), showing its robust mechanical stability. Furthermore, following exposure to acid, alkali, and aqueous solutions (7 days), UV irradiation (10 days), and extreme temperature variations (–20 °C to 80 °C), the coatings retained their superhydrophobic properties and exhibited good chemical durability. This method offers a novel approach to enhance the durability and practicality of superhydrophobic coatings.

Preparation of superhydrophobic asymmetric vitrimer coating with high porosity and the key role of hierarchical pocket structure on long freeze delay time and high durability

AbstractIt is still a big challenge to prepare superhydrophobic anti‐icing coatings with long freeze delay performance and high durability. In this work, in different with conventional flexible porous coating, we prepared an asymmetric coating with hierarchical pocket structure by a facile hot‐pressing/salt‐leaching (BHS) method on a polyacrylate vitrimer polymer with mellability. The asymmetric architecture endowed porous coating with low density and high adhesion strength. The in‐situ growth of silica nanoparticles in above porous coating and surface modification generated a superhydrophobic hierarchical pocket structure. As a result, the freezing delay time was drastically increased to 14,400 s at −10°C. Furthermore, owing to hierarchical pocket structure, the coating could maintain its superhydrophobicity and anti‐icing performance under water flow impacting at 10 kPa pressure, 30 cycles of sandpaper abrasion, 50 cycles of tape peeling, showing advantageous high durability. By employing the hierarchical porous coating on heat exchangers, the energy consumption was drastically reduced by 93%.

Supramolecular polymer-based, ultra-robust, and nonfluorinated, sub-zero temperature self-healing superhydrophobic coatings for energy harvesting

In this study, ultra-robust, nonfluorinated, and sub-zero temperature self-healing superhydrophobic coatings are fabricated by spray-coating imine-bond crosslinked polydimethylsiloxane-based supramolecular polymers (I-PDMS) and SiO2 nanoparticles (NPs). Due to the synergy between I-PDMS binding and SiO2 NPs reinforcement, the resulting I-PDMS/SiO2 coatings can maintain their superhydrophobicity after sandpaper abrasion, sand impacting, hand tapping, and foot trampling and showed the best mechanical robustness among reported superhydrophobic coatings. Furthermore, due to the low glass-transition temperature of I-PDMS monomers and the dynamic nature of the imine bonds, the I-PDMS/SiO2 coatings can spontaneously restore their damaged superhydrophobicity at − 30 °C through the free energy-driven diffusion of I-PDMS monomers. The I-PDMS/SiO2 coatings can be used as friction layers for triboelectric nanogenerators (TENGs), which provide them with long-lasting waterproofing and self-cleaning capabilities, thus preventing their output performance from being degraded due to water infiltration and dust accumulation. Due to the excellent mechanical strength of the I-PDMS/SiO2 coatings, the resulting self-healing superhydrophobic TENGs can generate electrical energy from repetitive motions such as hand tapping or foot trampling, which has not been possible in other reported superhydrophobic TENGs.

Fabrication of high-durability superhydrophobic coatings based on dual-sized SiC particles

In recent years, inspired by “biomimicry”, superhydrophobic surfaces have gained significant attention. Superhydrophobic surfaces demonstrate notable advantages in addressing interfacial issues, and superhydrophobic coatings exhibit excellent waterproofness, anti-fouling, self-cleaning, anti-corrosion, and additional capabilities, making them promising next-generation waterproof materials. However, the complex preparation process, coupled with poor wear resistance and environmental durability, severely limits their practical applications. Therefore, this article started from simplifying the preparation process and improving the durability of the coatings. Epoxy resin (E51) was used as the film-forming material, and carbon nanotubes (CNTs) and dual-sized SiC particles (nano-SiC and micro-SiC) were used as the fillers. Room temperature vulcanized silicone rubber (RTV) was used as a binder interacting with epoxy resin to promote the interface interaction between the fillers and the polymers. This process resulted in the successful preparation of superhydrophobic coatings with outstanding comprehensive performance. When the ratio of μ-SiC to n-SiC was 1:1, the prepared coating exhibited the best superhydrophobic properties with a water contact angle (WCA) of 167.4° and a sliding angle (SA) of 4.6°. Even after undergoing severe mechanical tests, such as sandpaper abrasion for 1000 cycles, sand impact for 100 cycles, cross-cut test, and tape-peeling for 70 cycles, the coatings still maintained their non-wetting Cassie-Baxter state. Furthermore, even after immersion in strong acid, strong alkali and 3.5 wt% NaCl solutions for 6 days, keeping at 500 ℃ for 2 hours, and exposure to ultraviolet for 6 days, the coatings still exhibited excellent superhydrophobicity. This suggested that the prepared coating had excellent chemical stability and high-temperature resistance. In addition, the superhydrophobic coating exhibited exceptional capabilities in self-cleaning, anti-corrosion, anti-icing, and de-icing properties. Furthermore, this coating, applicable to diverse substrates including board, steel, paper, and glass, demonstrated an impressive water contact angle (WCA) and sliding angle (SA). The spraying method offers the benefits of simplicity and cost-effectiveness. This is poised to significantly broaden its practical applications in various fields, including construction, transportation, and the chemical industry.

A mechanically robust superhydrophobic corrosion resistant coating with self-healing capability

Conferring self-healing capability represents an effective approach for extending the lifespan of multifunctional superhydrophobic coatings. Presently, reported self-healing superhydrophobic coatings exhibit scratch-healing capabilities ranging from 5 μm to 40 μm. However, achieving large-scale scratch-healing (>100 μm) remains a significant challenge within this research domain. In this paper, we introduces the design and fabrication of a dual-layer self-healing superhydrophobic anti-corrosion coating using polycaprolactone (PCL), EASTMAN Kristalex 3085 resin (EK), epoxy resin (EP), and 1H, 1H, 2H, 2H-perfluorodecyltriethoxysilane (PFDTES) modified silica particles via a facile spray-coating approach. The surface morphology, chemical composition, wettability, self-cleaning, damage-healing, and anti-corrosion behaviors of the coating were thoroughly evaluated. Results demonstrate that the coating exhibits self-healing capabilities across multiple scratch-damage scales (45 μm, 55 μm, and 100 μm), particularly exhibiting superior large-scale scratch-healing ability. Furthermore, the coating displays outstanding corrosion resistance, with the charge transfer resistance (Rct) increasing by nearly 8 orders of magnitude compared to the bare Q235 carbon steel substrate. Although the corrosion resistance of the scratch-damaged coatings significantly decreases, the anti-corrosion capability of the scratch-healed coating is effectively restored to its initial state, showcasing excellent anti-corrosion sustainability. Additionally, the coating demonstrates remarkable mechanical stability, withstanding 90 sandpaper abrasion cycles and 70 tape-peeling cycles.

Superhydrophobic Surfaces with Excellent Ice Prevention and Drag Reduction Properties Inspired by Iridaceae Leaf.

The anti-icing and drag-reduction properties of diverse microstructured surfaces have undergone extensive study over the past decade. Nonetheless, tough environments enforce stringent demands on the composite characteristics of superhydrophobic surfaces (SHS). In this study, fresh composite structures were fabricated on a metal substrate by nanosecond laser machining technology, drawing inspiration from the hardy plant Iridaceae. The prepared sample surface mainly consists of a periodic microrhombus array and irregular nanosheets. To comprehensively investigate the effect of its special structure on surface properties, three surfaces with different sizes of rhombic structures were used for comparative analysis, and the results show that the SH-S2 sample is optimal. This can significantly delay the freezing time by an impressive 1404 s at -10 °C while revealing the sample surface anti-icing strategy. In addition, the rheological experiments determined over 300 μm of slip length for the SH-S2 sample, and the drag reduction rate of the surface reaches nearly 40%, which is well aligned with the results of the delayed icing experiments. Finally, the mechanical durability of the SH-S2 surface was investigated through scratch damage, sandpaper abrasion, reparability trials, and icing and melting cycle tests. This research presents a new approach and methodology for the application of SHS on polar ship surfaces.

Preparation and properties of high abrasion resistant superhydrophobic coating on the PCB

Abrasion resistance has become the bottleneck restricting the application of superhydrophobic surface. It is extremely necessary to design superhydrophobic surface with high abrasion resistance in practical application environment. However, the coexistence of superhydrophobic property and abrasion resistance is a difficult challenge to balance. In this study, a superhydrophobic coating with high abrasion resistance was obtained in combination with three gradients of roughness/wettability, physical adhesion and chemical coupling on the printed circuit board (PCB) surface. The realization of high abrasion resistance of the coating mainly depended on controlling the curing time of the adhesive layer and the way of air injection, so that the micro-nano structure could achieve the effect of semi-embedded. The PCB surface still maintained superhydrophobicity with the water contact angle higher than 150° after a series of tests such as 800 cycles of tape peeling, 400 cycles of knife scraping, 2600 cm of sandpaper abrasion, 425 g of falling sand impacting, and 60 min of water impacting, which fully proved the high abrasion resistance of the coating and the strong adhesion between the coating and the substrate. The preparation process is high efficiency and suitable for large area application, which will provide an extremely valuable idea for improving the waterproof of PCB and promote the true applications of superhydrophobic coating in many fields.

A New Composite Material with Energy Storage, Electro/Photo-Thermal and Robust Super-Hydrophobic Properties for High-Efficiency Anti-Icing/De-Icing.

All weather, high-efficiency, energy-saving anti-icing/de-icing materials are of great importance for solving the problem of ice accumulation on outdoor equipment surfaces. In this study, a composite material with energy storage, active electro-/photo-thermal de-icing and passive super-hydrophobic anti-icing properties is proposed. Fluorinated epoxy resin and MWCNTs/PTFE particles are used to prepare the top multifunctional anti-icing/de-icing layer, which exhibited super-hydrophobicity with water contact angle greater than 155° and conductivity higher than 69Sm-1. The super-hydrophobic durability of the top layer is verified through tape peeling and sandpaper abrasion tests. The surface can be heated by applying on voltage or light illumination, showing efficient electro-/photo-thermal and all-day anti-icing/de-icing performance. The oleogel material at the bottom layer is capable to absorb energy during heating process and release it during cooling process by phase transition, which greatly delayed the freezing time and saved energy. The icing test of single ice droplet, electro-/photo-thermal de-icing and defrosting tests also proved the high efficiency and energy saving of the anti-icing/de-icing strategy. This study provided a new way to manufacture multi-functional materials for practical anti-icing/de-icing applications.

Fabrication and characterization of durable superhydrophobic and superoleophobic surfaces on stainless steel mesh substrates

Introduction. This study explores the fabrication of durable superhydrophobic and superoleophobic surfaces on stainless steel mesh, inspired by natural structures like lotus leaves. Achieving superoleophobicity, especially with enhanced durability, is challenging due to the lower surface tension of oils. Methodology. This novel technique involves using Perfluorooctyltriethoxysilane (PFOTES) and silicon dioxide nanoparticles to create re-entrant structures, low surface energy, and high roughness. This cost-effective approach ensures simplicity without requiring expensive equipment. Results. The resulting surfaces exhibit remarkable superoleophobic properties, with hexadecane and soybean oil contact angles reaching 170° and 163.8°, respectively. Scanning electron microscopy confirms successful fabrication, and wear abrasion tests demonstrate mechanical durability, with contact angles remaining high even after cyclic loading and sandpaper abrasion. Conclusion. This study presents a pioneering, cost-effective method for fabricating durable superoleophobic surfaces on stainless steel mesh. These surfaces hold promise for applications in self-cleaning coatings and oil-repellent materials.

Fabrication of Superhydrophobic Coating by Spraying PDMS-SiO2 Suspension for Self-Cleaning Application

Superhydrophobic surfaces that mimic lotus leaf surfaces have been widely studied due to their unique self-cleaning ability. Herein, we have fabricated a self-cleaning superhydrophobic coating on a glass substrate using the facile sol-gel spray coating method. The silica particles were synthesized via the sol-gel method in acidic conditions. A self-cleaning superhydrophobic coating was achieved by spraying a suspension of synthesized SiO2 particles and PDMS on a glass substrate at room temperature. The incorporation of SiO2 particles in the PDMS matrix resulted in the formation of a rough structure on the glass surface. This surface exhibited excellent superhydrophobic properties with a high water contact angle (WCA) of 154° and a low sliding angle (SA) of 4°. In addition, the prepared samples showed strong mechanical resistance against various tests such as multiple adhesive tape peeling, sandpaper abrasion, and pencil hardness. As a result, the developed superhydrophobic coating holds great potential for self-cleaning applications on a larger scale.

Facile fabrication of multiple biomimetic patterned superwetting zinc surfaces with enhanced collecting efficiency from water mist

Water shortage has emerged as a significant worldwide issue as a result of the frequency of extreme weather events like storms, droughts and climate warming. One possible way to address the world's freshwater deficit is to effectively extract freshwater from water mist. In this work, a series of biomimetic superhydrophobic-hydrophilic patterned zinc materials for mist collection was designed via mold pressing, anodic oxidation and laser-scanning methods. The fog collector is able to capture droplets efficiently and transport water quickly due to its unique array structure. The patterned superhydrophobic-hydrophilic zinc surface contained the highest water mist collection efficiency of about 10.89 g·m−2·s−1, which is 75 % higher than the original zinc sheet. The surface structure, chemical composition of the superwetting zinc materials were investigated by FT-IR, XPS, FESEM and EDS, respectively. In addition, the mechanical robustness, weather ability and enhancing mechanism of the prepared superwetting zinc surfaces were investigated via UV exposure, multiple thermal/cold cycles and sandpaper abrasion treatment. The good collecting efficiency from water mist of the obtained functional surfaces may provide ideas for the future design of mist collection materials.

Transparent, superhydrophobic, and flexible polyimide films with robust and durable imide/silica particles surface prepared via a sintering process

Recently, transparent superhydrophobic surfaces have attracted great interest due to their potential applications in various fields, such as skyscrapers, windows, glass doors, displays, and solar panels. However, flexible films with superhydrophobicity and transparency still face challenges in practical applications due to their lack of durability of the properties. Here, we report transparent, superhydrophobic, and flexible polyimide films with robust oligoimide/silica protrusion surface prepared by a simple sintering process, aiming to address the above issues. A transparent polyimide film (PIF) and nano-silica particles modified with an oligoimide (NSOI) were separately prepared, and the sintering between PIF and NSOI were performed to obtain PINSOI samples. Among PINSOIs, the optimal PINSOI-3 sample exhibited excellent superhydrophobicity, optical transmittance and tensile strength. After folding/torsion, sandpaper abrasion, tape peeling and acidic/basic immersion tests, its superhydrophobicity was maintained, indicating excellent mechanical and chemical durability of superhydrophobicity even under harsh conditions. Also, after a standard accelerated weathering test, its superhydrophobicity, transmittance and tensile strength were almost completely maintained, indicating the excellent weathering durability of PINSOI-3. These durability properties of PINSOI-3 could be attributed to that the sintering resulted in strong fusion between the NSOI particles and PIF by chain entanglement. PINSOI-3 showed excellent self-cleaning performance, and it can be applied as a self-cleaning film for flexible or curved solar cells and displays.

Durable Janus membrane with on-demand mode switching fabricated by femtosecond laser

Despite their notable unidirectional water transport capabilities, Janus membranes are commonly challenged by the fragility of their chemical coatings and the clogging of open microchannels. Here, an on-demand mode-switching strategy is presented to consider the Janus functionality and mechanical durability separately and implement them by simply stretching and releasing the membrane. The stretching Janus mode facilitates unidirectional liquid flow through the hydrophilic micropores-microgrooves channels (PG channels) fabricated by femtosecond laser. The releasing protection mode is designed for the in-situ closure of the PG channels upon encountering external abrasion and impact. The protection mode imparts the Janus membrane robustness to reserve water unidirectional penetration under harsh conditions, such as 2000 cycles mechanical abrasion, 10 days exposure in air and other rigorous tests (sandpaper abrasion, finger rubbing, sand impact and tape peeling). The underlying mechanism of gridded grooves in protecting and enhancing water flow is unveiled. The Janus membrane serves as a fog collector to demonstrate its unwavering mechanical durability in harsh real-world conditions. The presented design strategy could open up new possibilities of Janus membrane in a multitude of applications ranging from multiphase separation devices to fog harvesting and wearable health-monitoring patches.

Wettability-driven synergistic resistance of scale and oil on robust superamphiphobic coating

Disgusting deposits (e.g., scale and crude oil) in daily life and industrial production are always serious problems, posing great threats to the safety and economic development. However, most of developed coatings can only conquer one part of these deposits such as superhydrophobic coatings possess anti-scaling capacity but would adhere crude oil. To integrate scale resistance with oil repellence, we herein report a robust superamphiphobic (SAB) coating simultaneously reducing pollution of scale and oil for extended period of time (two weeks with over 98% reduction). Compared with single role of superhydrophobic and amphiphilic surfaces, the SAB coating can not only inhibit interfacial nucleation of scale but also reduce the adhesion of formed scale and polluted oil. The durability of the SAB coating is evaluated via mechanical tests (sandpaper abrasion, tape stripping and sand falling) and chemical corrosion (corrosive liquid immersing), revealed by sustainable high contact angles and low contact angle hysteresis of water and oil. The universality of this strategy can be further confirmed by adding different particles like kaolin, Al2O3, and SiO2, resisting multiple types of scale (i.e., CaSO4, BaSO4 and MgCO3) and oil (i.e., glycerol, glycol, and mineral oil). Therefore, this study provides an ideal avenue for resisting scale and oil, which may be used for conquering the complexity of application environments (e.g., oil production and transportation).

Functionalized borosilicate-silica-epoxy nanocomposite superhydrophobic coating for corrosion inhibition under harsh environment

Current work proposes a facile scheme for fabrication of robust superhydrophobic borosilicate-silica-epoxy nanocomposite coatings on steel substrate with hierarchical structures, capable of inhibiting corrosion under harsh environment. The scheme amalgamates the advantageous properties of three ingredients: acid resistant property of borosilicate glass, superhydrophobic features of functionalized silica nanoparticles and durability of epoxy resin. The various steps of synthesis include 1. ball milling of borosilicate glass to micron and submicron size (~500 nm to 1.5 μm) 2. grafting of silica nanoparticles (~20 nm, through stober method) on the borosilicate particles to form rough hierarchical structure and 3. preparation of stable dispersion of the nanoparticles in epoxy-based resin followed by coating through immersion technique. Efficacy of the scheme was established through morphological, durability and electrochemical impedance studies. The surface morphology revealed hierarchical structures of functionalized silica nanoparticles (size range 20–100 nm) grafted on micro-sized borosilicate particles, which sustained water droplets with contact angle as high as 164.5° ± 2°. Sandpaper abrasion test proved excellent durability retaining hydrophobicity up to 250 abrasion cycles. The prepared surface maintained notable interface stability under aggressive environment: 3 and 10 days under pH 1 and 13 respectively. The electrochemical study in 3.5 wt% NaCl aqueous solution showed significant decrease in corrosion current density of coated surface (0.3585 μA/cm2) compared to uncoated surface (43.918 μA/cm2) suggesting excellent corrosion resistance. The results highlight scope of using this robust coating for abrasive and harsh environment.

Design and fabrication of superhydrophobic photothermal coating on copper mesh and its applications on anti-corrosion, anti-icing and oil-water separation

The discharge of oily wastewater, the leakage of high-viscosity oils as well as corrosion and freezing of metal equipment surfaces have not only caused large economic losses, but also posed a major threat to environmental safety, which has sparked international concern. Superhydrophobic materials inspired by lotus leaves were great options for addressing these problems because of their special surface wettability. In this study, a simple hydrothermal approach (in-situ CuxS growth) and post-modification technique (stearic acid modification) was used to create a superhydrophobic-superoleophilic-photothermal (SHPB-SOPI-PT) coating on the surface of copper mesh. The SHPB-SOPI-PT coating was found to be good self-cleaning ability, mechanical durability (ultrasonic vibration, sandpaper abrasion, tape peeling, surface bending), chemical stability (pH = 1, pH = 13, and 3.5 wt% NaCl solution) and environmental adaptability (thermal, UV aging, acid rain and long-term unprotected storage). Meanwhile, the SHPB-SOPI-PT coating offered ideal corrosion protection (η = 97.7 %), passive anti-icing performance (1800 % longer freezing time), oil-water separation performance. More importantly, the SHPB-SOPI-PT coating also provided active de-icing and high-efficient separation of high viscosity oils due to the photothermal effect of CuxS. This method of constructing multifunctional coating was easy to produce and utilize on a large scale, which could expand the serviceable range of copper-based materials.

Anti-corrosion and anti-fouling superhydrophobic silicone coating with continuous micro/nano structure

At present, silicone superhydrophobic coatings are attracting much attention in the fields of anti-corrosion and antifouling, so they have a broad application prospect. In this paper, superhydrophobic surfaces with continuous micro/nano structure were prepared on various substrates using a simple blending method similar to the conventional preparation of RT vulcanized silicone rubber. The difference was that the new kinds of crosslinker (MF-S) was synthesized by 3-glycidyloxypropyltrimethocysilane and 3-aminopropyltriethoxysilane. Linear fluorinated copolymer (L-SF) was prepared by free radical polymerization of 3-mercaptopropyltriethoxysilane (MPTES) and 1H, 1H, 7H-dodecafluoroheptyl methacrylate (DFMA). And the condensation reaction with α, ω-dihydroxypodimethylsiloxane (PDMS), tetraethyl orthosilicate (TEOS), and inorganic nanoparticles constructed superhydrophobic coatings with continuous micro- and nanostructures. The coating had a water contact angle (WCA) of up to 162° and a sliding angle (SA) as low as 2°. What's more, the WCA of the coating remained around 160° and the SA stayed below 5° after sandpaper abrasion, UV irradiation, and hot and cold treatment. The adhesion of the coating on different substrates was higher than 2 MPa. Due to the synergistic effect of the superhydrophobicity of the coating and the photocatalytic activity of the TiO2 nanoparticles, the coating achieves an antimicrobial efficiency of 97.8 % against Staphylococcus aureus. The synergistic effect of the air layer and the densification of the coating resulted in the electrical impedance modulus at the lowest frequency of the coating remaining two orders of magnitude higher than that of the bare carbon steel plate after several days of immersion in sodium chloride solution. The work showed great potential for application in anti-corrosion and anti-fouling coatings.