scholarly journals The Antifouling and Drag-Reduction Performance of Alumina Reinforced Polydimethylsiloxane Coatings Containing Phenylmethylsilicone Oil

Polymers ◽  
2021 ◽  
Vol 13 (18) ◽  
pp. 3067
Author(s):  
Qiang Yang ◽  
Zhanping Zhang ◽  
Yuhong Qi ◽  
Hongyang Zhang
Keyword(s):  
Elastic Modulus ◽  
Drag Reduction ◽  
Surface Deformation ◽  
Silicone Oil ◽  
Leaching Behavior ◽  
Nano Alumina ◽  
Fouling Release ◽  
Alumina Addition ◽  
Fouling Organisms ◽  
Addition Amount

Fouling-release coatings reinforced with micro-alumina and nano-alumina were prepared based on polydimethylsiloxane (PDMS) containing phenylmethylsilicone oil. The surface properties, mechanical properties, leaching behavior of silicone oil, anti-fouling and drag-reduction performance of the coating were studied. The results show that the addition of alumina can significantly improve the tensile strength, elastic modulus and Shore’s hardness of the coating. The adhesion experiments of marine bacteria and Navicula Tenera show that the addition of alumina can reduce the antifouling performance of the coating, which is related to the stripping mode of fouling organisms. The fouling organisms leave the coating surface by shearing, and the energy required for shearing is proportional to the elastic modulus of the coating. At 800–1400 rpm, the addition of alumina will reduce the drag reduction performance of the coating, which is related to the drag reduction mechanism of PDMS. PDMS counteracts part of the resistance by surface deformation. The larger the elastic modulus is, the more difficult the surface deformation is. The experiment of silicone oil leaching shows that the increase of alumina addition amount and the decrease of particle size will inhibit the leaching of silicone oil.

scholarly journals Influence of Phenylmethylsilicone Oil on Anti-Fouling and Drag-Reduction Performance of Silicone Composite Coatings

Coatings ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1239
Author(s):  
Qiang Yang ◽  
Zhanping Zhang ◽  
Yuhong Qi ◽  
Hongyang Zhang
Keyword(s):  
Drag Reduction ◽  
Removal Rate ◽  
Composite Coatings ◽  
Reduction Rate ◽  
Selection Experiment ◽  
Adhesion Test ◽  
Fouling Release ◽  
Bacteria Adhesion ◽  
Addition Amount ◽  
Adhesion Factor

In this study, we explore the effect of phenylmethylsilicone oil (PSO) addition amount and viscosity in a fouling release coating based on polydimethylsiloxane (PDMS). The surface properties, mechanical properties, anti-fouling and drag-reduction performance of the coating were studied. Meanwhile the influence of the basic properties of the coating on the anti-fouling and drag-reduction performance was also studied. Subsequently, the antifouling performance of the coating was investigated by the Navicula Tenera and bacteria adhesion test. As a result, the high content of PSO paint has a high foul removal rate. The incorporation of PSO into paint can reduce the elastic modulus and surface energy of the coating to reduce its relative adhesion factor (RAF). The lower the RAF, the better the antifouling effect of the coating. The drag-reduction performance of the coating was verified by the torque selection experiment, and the results showed that incorporation of PSO into paint can enhance the elongation and hydrophobicity of the coating, thereby increasing the drag reduction rate of the coating.

scholarly journals Fouling Release Coatings Based on Polydimethylsiloxane with the Incorporation of Phenylmethylsilicone Oil

Coatings ◽  
2018 ◽  
Vol 8 (5) ◽  
pp. 153 ◽  
Author(s):  
Miao Ba ◽  
Zhanping Zhang ◽  
Yuhong Qi
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Removal Rate ◽  
High Viscosity ◽  
Benthic Diatom ◽  
Release Time ◽  
Enhancement Effect ◽  
Adhesion Test ◽  
Leaching Behavior ◽  
Fouling Release

In this study, phenylmethylsilicone oil (PSO) with different viscosity was used for research in fouling release coatings based on polydimethylsiloxane (PDMS). The surface properties and mechanical properties of the coatings were investigated, while the leaching behavior of PSO from the coatings was studied. Subsequently, the antifouling performance of the coatings was investigated by the benthic diatom adhesion test. The results showed that the coatings with high-viscosity PSO exhibited high levels of hydrophobicity and PSO leaching, while the high PSO content significantly decreased the elastic modulus of the coatings and prolonged the release time of PSO. The antifouling results indicated that the incorporation of PSO into coatings enhanced the antifouling performance of the coating by improving the coating hydrophobicity and decreasing the coating elastic modulus, while the leaching of PSO from the coatings improved the fouling removal rate of the coating. This suggests a double enhancement effect on the antifouling performance of fouling release coatings based on PDMS with PSO incorporated.

scholarly journals Fouling-Release Performance of Silicone Oil-Modified Siloxane-Polyurethane Coatings

2016 ◽  
Vol 8 (42) ◽  
pp. 29025-29036 ◽  
Author(s):  
Teluka P. Galhenage ◽  
Dylan Hoffman ◽  
Samantha D. Silbert ◽  
Shane J. Stafslien ◽  
Justin Daniels ◽  
...  
Keyword(s):  
Silicone Oil ◽  
Polyurethane Coatings ◽  
Fouling Release

Characterization of Chemically and Topographically Modified Siloxane Elastomer for Controlled Cell Growth

2001 ◽  
Vol 711 ◽  
Author(s):  
Amy L. Gibson ◽  
Leslie H. Wilson ◽  
Wade R. Wilkerson ◽  
Adam W. Feinberg ◽  
Charles A. Seegert ◽  
...  
Keyword(s):  
Elastic Modulus ◽  
Cell Growth ◽  
Surface Energy ◽  
Cellular Response ◽  
Silicone Oil ◽  
Control Cell ◽  
Weight Percent ◽  
Mechanical Analysis ◽  
Specific Cell ◽  
Silicone Oils

ABSTRACTA main limitation of biomedical devices is the inability to start, stop, and control cell growth making it crucial to develop biomaterial surfaces that induce a desired cellular response. Micropatterns of ridges and pillars were created in a siloxane elastomer (Dow Corning) by casting against epoxy replicates of a micromachined silicon wafer. Silicone oils were incorporated to determine the change in modulus and surface energy caused by these additives. SEM and white light interference profilometry verified that the micropatterning process produced high fidelity, low defect micropatterns. Mechanical analysis indicated that varying the viscosity, weight percent and functionality of the added silicone oil could change the elastic modulus by over an order of magnitude (0.1-2.3 MPa). As a self-wetting resin, silicone oils migrate to the surface, hence changing the surface properties from the bulk. Both topographical and chemical features define the surface energy, which in combination with elastic modulus, dictate biological activity. The results imply that the morphology, mechanical properties and surface energy of the siloxane elastomer can be modified to elicit a specific cell response as a function of engineered topographical and chemical functionalization.

scholarly journals Elastically Graded Titanium Alloy Produced by Mechanical Surface Deformation

2021 ◽  
Vol 8 ◽  
Author(s):  
Stéphanie Delannoy ◽  
Sarah Baïz ◽  
Pascal Laheurte ◽  
Laurence Jordan ◽  
Frédéric Prima
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Shot Peening ◽  
Surface Deformation ◽  
Tensile Tests ◽  
Uniaxial Tensile ◽  
X Ray Diffraction ◽  
Electron Microscopies ◽  
Transmission Electron ◽  
Micro Indentation

The objective of this study was to develop a thermo-mechanical strategy to create a radial elasticity gradient in a β metastable Ti-Nb-Zr alloy, and to characterize it in terms of microstructural and mechanical properties. A first investigation was conducted on thin samples of Ti-20Nb-6Zr (at.%) submitted to various thermo-mechanical treatments. Microstructure-properties relationships and elastic variability of this alloy were determined performing uniaxial tensile tests, X-ray diffraction and scanning and transmission electron microscopies. Based on these preliminary results, mechanical deformation was identified as a potential way to lower the elastic modulus of the alloy. In order to create elastically graded pieces, shot-peening was therefore carried out on thicker samples to engender surface deformation. In this second part of the work, local mechanical properties were evaluated by instrumented micro-indentation. Experimental observations demonstrated that shot-peening enabled to locally induce martensitic transformation on surface, and a decrease in indentation elastic modulus from 85 to 65 GPa over 400 μm was highlighted. Surface deformation proved to be an efficient way of creating an elasticity gradient in β metastable titanium alloys. This combination of material and process could be suitable to produce dental implants with mechanically enhanced biocompatibility.

scholarly journals Design of surfaces for controlling hard and soft fouling

2018 ◽  
Vol 377 (2138) ◽  
pp. 20180266 ◽  
Author(s):  
Alex Kate Halvey ◽  
Brian Macdonald ◽  
Abhishek Dhyani ◽  
Anish Tuteja
Keyword(s):  
Elastic Modulus ◽  
Surface Deformation ◽  
Bulk Material ◽  
Interfacial Free Energy ◽  
Length Scale ◽  
Design Strategies ◽  
Theme Issue ◽  
Surface Design ◽  
Low Modulus ◽  
Solid Contaminant

In this review, we present a framework to guide the design of surfaces which are resistant to solid fouling, based on the modulus and length scale of the fouling material. Solid fouling is defined as the undesired attachment of solid contaminants including ice, clathrates, waxes, inorganic scale, polymers, proteins, dust and biological materials. We first provide an overview of the surface design approaches typically applied across the scope of solid fouling and explain how these disparate research efforts can be united to an extent under a single framework. We discuss how the elastic modulus and the operating length scale of a foulant determine its ability or inability to elastically deform surfaces. When surface deformation occurs, minimization of the substrate elastic modulus is critical for the facile de-bonding of a solid contaminant. Foulants with low modulus or small deposition sizes cannot deform an elastic bulk material and instead de-bond more readily from surfaces with chemistries that minimize their interfacial free energy or induce a particular repellant interaction with the foulant. Overall, we review reported surface design strategies for the reduction in solid fouling, and provide perspective regarding how our framework, together with the modulus and length scale of a foulant, can guide future antifouling surface designs. This article is part of the theme issue ‘Bioinspired materials and surfaces for green science and technology’.

Investigation on Drag Reduction Through Dimple Machining

2018 ◽  
Author(s):  
Majid TabkhPaz ◽  
Lindsay Howell ◽  
Zachary Kockerbeck ◽  
Simon Park ◽  
Ron Hugo
Keyword(s):  
Drag Reduction ◽  
Silicone Oil ◽  
Reynolds Numbers ◽  
System Capacity ◽  
Micro Milling ◽  
Fluid Viscosity ◽  
Low Reynolds Numbers ◽  
Milling Tool ◽  
Transmission Pipeline ◽  
Surface Patterns

High friction between a fluid and a pipe wall results in increased pumping requirements. This friction contributes to lower production rates and reduced system capacity. Thermal heating, fluid blending, and drag reducing agents (DRA) are commonly used methods for decreasing pressure drop in pipelines. Surface patterns inscribed onto internal pipe walls have also been shown to reduce fluid friction. In this paper, the effects of different surface patterns on the shear between a fluid and a wall are studied. Surfaces with different dimple patterns are investigated. Micro-dimpled patterns on the surface are created using an inclined, flat end micro-milling tool. The surfaces with different dimpled patterns are characterized and tested through morphological, contact angle, and viscosity measurement studies. The effects of the surface patterns are also studied through simulation. A Power Law relationship and apparent fluid viscosity is determined for the low Reynolds numbers investigated. The deepest dimpled surfaces investigated (0.2 mm dimple depth) result in a drag reduction of approximately 20% for silicone oil. Further research and application of the results to transmission pipeline systems are discussed.

Influence of Elastic Modulus of Matrix on Conductivity of VGCF Dispersed in Plastic Matrix

2021 ◽  
Vol 1016 ◽  
pp. 243-249
Author(s):  
Toi Aoki ◽  
Noboru Nakayama ◽  
Masaomi Horita ◽  
Hiroaki Fukui
Keyword(s):  
Carbon Nanotubes ◽  
Elastic Modulus ◽  
Electrical Properties ◽  
Applied Load ◽  
Pressure Sensors ◽  
Polymer Nanocomposite ◽  
Conductive Materials ◽  
Pressure Sensitive ◽  
Plastic Matrix ◽  
Addition Amount

Pressure-sensitive conductive material is used for various pressure sensors consists of a polymer nanocomposite with carbon nanotubes (VGCF). And the resistance in it were changed by adding applied load. Recently, carbon nanotubes (VGCF) has drawn attention as a function filler that imparts various functions to a resin, including electrical properties. In polycarbonate (PC) composite with VGCF, the resistance decreases with increase in applied load. And increase of the addition amount of VGCF was enhanced the mechanical properties and electronic properties. In addition, this conclusion suggested that strain of PC/VGCF caused reducing the resistance. Therefore, changing matrix is predictably effective on electrical properties in pressure-conductive materials. In the present study, we used various matrix had different elastic modulus. The addition amount of VGCF was 12.5% volume rate. We made silicone/VGCF and polyethylene (PE)/VGCF and polycarbonate (PC)/VGCF by twin screw extruder and injection moldings. To clarify the influence of elastic modulus of matrix on conductivity of VGCF dispersed plastic matrix composites. The experimental results showed that conductive property of pressure-sensitive conductive materials is related to elastic modulus of them.

Using Hydrodynamic Testing to Assess the Performance of Five Fouling Control Coatings Immersed at Two Field Sites along the East Coast of Florida

2017 ◽  
Author(s):  
J. Travis Hunsucker ◽  
Harrison Gardner ◽  
Geoffrey Swain
Keyword(s):  
High Speed ◽  
East Coast ◽  
Immersion Test ◽  
Fouling Control ◽  
Drag Forces ◽  
Fouling Release ◽  
Fouling Control Coatings ◽  
Fouling Organisms ◽  
Hydrodynamic Testing ◽  
Static Immersion

Static immersion studies are commonly used to assess the performance of fouling control coatings. While these tests provide valuable data, it is also of importance to understand the drag forces associated with the accrued fouling communities and the velocities required for fouling removal. Combining the measurements of hydrodynamic testing with those from static immersion testing can help in predicting the performance of coatings prior to their consideration for use on Navy vessels. Replicates of five commercially available coatings (three fouling release coatings and two biocide based coatings) were deployed at two static immersion test sites located along the east coast of Florida (Port Canaveral and Sebastian Inlet). After four months of immersion, the panels were removed, photographed, subjected to known water velocities in a high-speed boat modified for hydrodynamic testing. Each panel was run at 5 m/s for 10 minutes, photographed, and then run at 10 m/s for 10 minutes. The drag forces were measured at speeds of 3, 6, 8.8 and 10 m/s for 1 minute each. Photographs taken before, during, and after hydrodynamic testing were also visually analyzed. After testing adhesion measurements were taken to determine the attachment strength of any hard fouling organisms which remained on the panels. The data collected from this series of tests, enabled the fouling control and fouling release properties of each coating to be characterized.

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