scholarly journals The Development of Polydimethysiloxane/ZnO–GO Antifouling Coatings

2021 ◽  
Author(s):  
Xiaoxue Zhang ◽  
Erland Årstøl ◽  
Marianne Nymark ◽  
Maxime Fages-Lartaud ◽  
Øyvind Mikkelsen
Keyword(s):  
Phaeodactylum Tricornutum ◽  
Marine Microorganisms ◽  
Mass Ratio ◽  
One Pot ◽  
Antifouling Coating ◽  
Antifouling Property ◽  
Antifouling Coatings ◽  
Mixing Method ◽  
Nanoscale Structure ◽  
Inaccurate Reading

Abstract The development of antifouling coating for sensor is desirable because the biofilm can shorten sensor’s life and cause inaccurate reading. In this study, a facile one-pot reaction was used to synthesized ZnO–graphene oxide (GO) (ZnO–GO) nanocomposites. Different amount of ZnO–GO was incorporated in the polydimethylsiloxane (PDMS) matrix respectively though a simple solution mixing method, in order to create PDMS/ZnO–GO nanocomposite (PZGO). The coating was obtained directly by spin coating of PZGO/tetrahydrofuran suspension. The hydrophobicity, surface roughness (Ra), surface free-energy (SFE) and nanoscale structure were investigated as antifouling factors. Antifouling tests were performed using two marine microorganisms, the cyanobacterium Synechococcus sp. Strain PCC 7002 and the diatom Phaeodactylum tricornutum. PZGO0.2 (mass ratio of ZnO–GO to PDMS: 0.2 wt%) displayed excellent antifouling property with 8.5% of Synechococcus sp. Strain PCC 7002 biofilm coverage, while PZGO0.1 (mass ratio of ZnO–GO to PDMS: 0.1 wt%) showed 2.4% P. tricornutum biofilm coverage. The antifouling property of the synthesized PZGO nanocomposite can be attributed to its high Ra and hydrophobicity which was caused by the good dispersion of ZnO–GO in PDMS matrix. This study suggests a potential of PZGO nanocomposite for sensor’s antifouling coating, which could contribute to improve sensor’s durability relating to biofouling in future. Graphic Abstract

Colloidal Silica/Poly(Methacrylsiloxane) Nanocomposite Particles: Synthesis, Characterization, and Application in Toners.

2014 ◽  
Vol 1663 ◽  
Author(s):  
Dmitry Fomitchev ◽  
Russell Lewis ◽  
Hairuo Tu ◽  
Li Cheng ◽  
Hajime Kambara ◽  
...  
Keyword(s):  
Particle Size ◽  
Colloidal Silica ◽  
Silica Particles ◽  
Laser Printer ◽  
Mass Ratio ◽  
One Pot ◽  
New Class ◽  
New Material ◽  
Hydrophobic Treatment ◽  
Hydrophobic Material

ABSTRACTWe report on a new class of materials for laser printer toner applications. These materials were prepared from methacrysilane-in-water emulsions stabilized with colloidal silica particles. In this elegant system, the colloidal silica particles reside at the water/oil interface helping to emulsify the oil droplet, self-organizing into a raspberry-like morphology. The emulsion formation is followed by free-radical polymerization, hydrophobic treatment, and drying steps. This one pot synthesis in water affords a hydrophobic material with a particle size in the range of 80 to 300 nm. The particle size could be fine-tuned by changing the oil-to-silica mass ratio or by using colloidal silica particles of different sizes. Results of material characterization by solid-state NMR, electron microscopy, and particle size measurements methods will be presented. Examples of possible extensions of the synthesis towards materials with methacrylsilane partially substituted with other methacrylates will be provided. Application of the new material in toners will be described as will the comparison of its performance with the incumbent material - hydrophobic colloidal silica.

One-pot synthesis of polydopamine–Zn complex antifouling coatings on membranes for ultrafiltration under harsh conditions

RSC Advances ◽  
2016 ◽  
Vol 6 (105) ◽  
pp. 103390-103398 ◽  
Author(s):  
Huiqing Wu ◽  
Jia Ming Ang ◽  
Junhua Kong ◽  
Chenyang Zhao ◽  
Yonghua Du ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Hybrid Coating ◽  
Ultrafiltration Membranes ◽  
One Pot ◽  
One Pot Synthesis ◽  
Antifouling Coatings ◽  
Harsh Conditions

In this work, dopamine is polymerized in a basic aqueous solution that contains zinc species to form a hybrid coating on polysulfone (PSf) ultrafiltration membranes.

Frictional Resistance of Antifouling Coating Systems

2004 ◽  
Vol 126 (6) ◽  
pp. 1039-1047 ◽  
Author(s):  
Michael P. Schultz
Keyword(s):  
Roughness Length ◽  
Frictional Resistance ◽  
Resistance Coefficient ◽  
Length Scale ◽  
Average Height ◽  
Test Fixture ◽  
Antifouling Coating ◽  
Plate Length ◽  
Antifouling Coatings ◽  
Frictional Resistance Coefficient

An experimental study has been made to compare the frictional resistance of several ship hull coatings in the unfouled, fouled, and cleaned conditions. Hydrodynamic tests were completed in a towing tank using a flat plate test fixture towed at a Reynolds number ReL range of 2.8×106-5.5×106 based on the plate length and towing velocity. The results indicate little difference in frictional resistance coefficient CF among the coatings in the unfouled condition. Significant differences were observed after 287 days of marine exposure, with the silicone antifouling coatings showing the largest increases in CF. While several of the surfaces returned to near their unfouled resistance after cleaning, coating damage led to significant increases in CF for other coatings. The roughness function ΔU+ for the unfouled coatings showed reasonable collapse to a Colebrook-type roughness function when the centerline average height k=0.17Ra was used as the roughness length scale. Excellent collapse of the roughness function for the barnacle fouled surfaces was obtained using a new roughness length scale based on the barnacle height and percent coverage.

Eco-friendly one-pot synthesis of well-adorned mesoporous g-C3N4 with efficiently enhanced visible light photocatalytic activity

2017 ◽  
Vol 7 (8) ◽  
pp. 1726-1734 ◽  
Author(s):  
Waheed Iqbal ◽  
Chunyang Dong ◽  
Mingyang Xing ◽  
Xianjun Tan ◽  
Jinlong Zhang
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Surface Area ◽  
Mass Ratio ◽  
One Pot ◽  
Visible Light Photocatalytic Activity ◽  
One Pot Synthesis ◽  
Visible Light Photocatalytic

We report a facile and eco-friendly one-pot synthesis of well-adorned mesoporous g-C3N4 material through a bubble templating strategy and involving controlling the surface area from 17 to 195 m2 g−1 by simply adjusting the mass ratio of melamine/NH4Cl.

scholarly journals Graphene Oxide/Silver Nanocomposites as Antifouling Coating on Sensor Housing Materials

2021 ◽  
Author(s):  
Xiaoxue Zhang ◽  
Øyvind Mikkelsen
Keyword(s):  
Graphene Oxide ◽  
Fish Farming ◽  
Water Quality Monitoring ◽  
Sensor Data ◽  
Valuable Insight ◽  
Ag Nps ◽  
Biofilm Growth ◽  
Antifouling Coating ◽  
Antifouling Property ◽  
Housing Materials

AbstractThese days, sensors are widely used in a variety of underwater sites like marine monitoring, fish-farming and water quality monitoring. However, to achieve reliable sensor data from long-term monitoring in aqueous solution, several challenges still need to be solved. Biofilm formation both on sensor housings and membranes is among one of the most serious challenges, which strongly influences the sensor responds and the validity of the results. To prevent biofilm growth, a series of graphene oxide (GO)/silver nanoparticles (Ag NPs) nanocomposites (GOA) have been developed and coated on sensor housing materials, e.g. polypropylene. The antifouling property of the GOA nanocomposite has been demonstrated by antifouling tests using Halomonas. Pacifica (Baumann et al.) Dobson and Franzmann (ATCC® 27122) (H. Pacifica) and a mixture of marine algae. The antifouling property of GOA composites has been proved to be closely related to the dispersibility of Ag NP. The overall work might provide valuable insight into developing antifouling materials for sensors in general.

scholarly journals Design and Preparation of PU/EP Blend Resin Grafted by Hydrophilic Molecular Segments

Coatings ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1345
Author(s):  
Gang Lu ◽  
Changgeng Shuai ◽  
Yinsong Liu ◽  
Xue Yang ◽  
Xiaoyang Hu
Keyword(s):  
Mechanical Properties ◽  
Essential Role ◽  
Functional Performance ◽  
Experimental Conditions ◽  
Plate Test ◽  
Antifouling Coating ◽  
Comprehensive Properties ◽  
Antifouling Coatings ◽  
Film Forming ◽  
Better Than

Film-forming resins, as carriers of antifouling coatings, play an essential role in the functional performance of coatings. With the gradual promotion of coatings in the field of marine antifouling, the preparation of film-forming resins containing hydrophilic chain segments is urgently needed to give full play to the functional and time-sensitive performance of antifouling coatings. In this paper, the single-ended isocyanate group (NCO) polyurethane (PU) prepolymer with hydrophilic chain segments was prepared and grafted onto an epoxy resin (EP) molecular chain to obtain the PU/EP grafted blend. Successful preparation of the PU/EP grafted blends was confirmed by infrared spectrum analysis. Simultaneously, the grafted blend was cured, and its hydrophilicity and mechanical properties were also tested. The results demonstrate that the grafted method can effectively improve the hydrophilicity of the film-forming resin while maintaining its mechanical properties. It can be concluded from the hydrophilic and mechanical properties of the materials that the comprehensive properties of PU/EP grafted blends are the best when the PU content is between 40% and 50%. The hanging plate test showed that the antifouling effect of the antifouling coating prepared by hydrophilic modified PU/EP film-forming resin was better than that of the traditional antifouling coating under the experimental conditions.

scholarly journals Antifouling Coatings Influence both Abundance and Community Structure of Colonizing Biofilms: a Case Study in the Northwestern Mediterranean Sea

2014 ◽  
Vol 80 (16) ◽  
pp. 4821-4831 ◽  
Author(s):  
Mercedes Camps ◽  
Aude Barani ◽  
Gérald Gregori ◽  
Agnès Bouchez ◽  
Brigitte Le Berre ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
Denaturing Gradient Gel Electrophoresis ◽  
Heterotrophic Bacteria ◽  
Content Type ◽  
Ship Hulls ◽  
Antifouling Coating ◽  
Antifouling Coatings ◽  
Gradient Gel Electrophoresis ◽  
Northwestern Mediterranean Sea ◽  
Northwestern Mediterranean

ABSTRACTWhen immersed in seawater, substrates are rapidly colonized by both micro- and macroorganisms. This process is responsible for important economic and ecological prejudices, particularly when related to ship hulls or aquaculture nets. Commercial antifouling coatings are supposed to reduce biofouling, i.e., micro- and macrofoulers. In this study, biofilms that primarily settled on seven different coatings (polyvinyl chloride [PVC], a fouling release coating [FRC], and five self-polishing copolymer coatings [SPC], including four commercial ones) were quantitatively studied, after 1 month of immersion in summer in the Toulon Bay (Northwestern Mediterranean Sea, France), by using flow cytometry (FCM), microscopy, and denaturing gradient gel electrophoresis. FCM was used after a pretreatment to separate cells from the biofilm matrix, in order to determine densities of heterotrophic bacteria, picocyanobacteria, and pico- and nanoeukaryotes on these coatings. Among diatoms, the only microphytobenthic class identified by microscopy,Licmophora,Navicula, andNitzschiawere determined to be the dominant taxa. Overall, biocide-free coatings showed higher densities than all other coatings, except for one biocidal coating, whatever the group of microorganisms. Heterotrophic bacteria always showed the highest densities, and diatoms showed the lowest, but the relative abundances of these groups varied depending on the coating. In particular, the copper-free SPC failed to prevent diatom settlement, whereas the pyrithione-free SPC exhibited high picocyanobacterial density. These results highlight the interest in FCM for antifouling coating assessment as well as specific selection among microbial communities by antifouling coatings.

Synthesis and Dispersing Performance of Hyperbranched Dispersant

2014 ◽  
Vol 893 ◽  
pp. 287-290
Author(s):  
Ru Qi Guan ◽  
Yan Mei Liu ◽  
Hai Hua Li ◽  
Yu Lei Tai ◽  
Guo Ku Chao ◽  
...  
Keyword(s):  
Reaction Temperature ◽  
Acid Value ◽  
Hyperbranched Polyester ◽  
Mass Ratio ◽  
One Pot ◽  
Vacuum Level ◽  
Melt Polymerization ◽  
Vacuum Degree ◽  
High Efficient ◽  
The Stability

Different hyperbranched polyester were synthesized by a simple one-pot melt polymerization method.The acid value,hydroxyl value and NMR were detected, we discussed the effect of proportion of DMPA,reaction temperature, vacuum level and vacuum time on acid value, hydroxyl value.The results show that the high efficient hyperbranched dispersant can be synthesized by the mass ratio of DMPA is 42.14%, vacuum time is 6h, vacuum degree is 30 kPa, and the stability kinetic is under 0.2.

scholarly journals Leaching Rate and Antifouling Property of Antifouling Coating Systems under Conditions Fouled by Sessile Organisms

2013 ◽  
Vol 48 (6) ◽  
pp. 826-831
Author(s):  
Ryuji Kojima ◽  
Shoko Imai ◽  
Toshiaki Shibata ◽  
Koichi Ueda
Keyword(s):  
Leaching Rate ◽  
Antifouling Coating ◽  
Antifouling Property ◽  
Sessile Organisms

scholarly journals Emulsifier-Free Acrylate-Based Emulsion Prepared by Reverse Iodine Transfer Polymerization

Polymers ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 730
Author(s):  
Tao Huang ◽  
Qing-Xia Yuan ◽  
Shu-Ling Gong
Keyword(s):  
Molecular Weight ◽  
Emulsion Polymerization ◽  
Water Resistance ◽  
Solid Content ◽  
Chain Extension ◽  
Mass Ratio ◽  
Melamine Formaldehyde ◽  
One Pot ◽  
Moderate Amount ◽  
Iodine Transfer

The self-emulsifying acrylate-based emulsions with solid content 45 wt.% were prepared in 3.5 h by reverse iodine transfer polymerization (RITP), and the polymer molecular weight (Mn) could be 30,000 g·mol−1. The influences of methacrylic acid (MAA) amount, soft/hard monomer mass ratio, and iodine amount on polymerization and latex were investigated. A moderate amount of ionized MAA was needed to stabilize the emulsion. Glass transition temperature (Tg) was decreased with the increasing mass ratio of soft/hard monomer. A higher iodine amount resulted in lower Mn. The increased Mn after chain extension of the polymer with water-insoluble monomers in iterative one-pot method proved the living of polymer. Compared with conventional emulsion polymerization, molecular weight (Mn) could be controlled, and Mn of polymer synthesized in RITP emulsion polymerization is higher; emulsion of polyacrylate-containing hydroxyl monomer units prepared by RITP emulsifier-free radical polymerization is more stable. Good properties, such as hardness, water resistance, adhesion, and increased value of maximum tensile of films modified by reaction of polyacrylate with melamine–formaldehyde (MF) resin, indicated potential application in baking coating.

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