scholarly journals Static Wettability of Differently Mechanically Treated and Amphiphobic-Coated Aluminium Surfaces

Materials ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2240
Author(s):  
Nataliia Fedorova ◽  
Bettina Ottinger ◽  
Vojislav Jovicic ◽  
Ana Zbogar-Rasic ◽  
Antonio Delgado ◽  
...  
Keyword(s):  
Surface Treatment ◽  
Temperature Stability ◽  
Contact Angles ◽  
Surface Finishing ◽  
Initial Surface ◽  
Coating Properties ◽  
Water Contact ◽  
Treatment Methods ◽  
Practical Applications ◽  
Mechanical Surface

Wettability, roughness and surface treatment methods are essential for the majority of practical applications, where liquid–solid surface interactions take place. The present study experimentally investigated the influence of different mechanical surface treatment methods on the static wettability of uncoated and amphiphobic-coated aluminium alloy (AlMg3) samples, specially focusing on the interaction between surface finishing and coating. Five different surfaces were prepared: as-received substrate, polished, sandpapered, fleece-abraded and sandblasted. After characterisation, the samples were spray-coated using an amphiphobic coating. The characterisation of the uncoated and coated samples involved measurements of the roughness parameters and the apparent contact angles of demineralized water and rapeseed oil. The coating was initially characterised regarding its adhesion to the sample and elevated temperature stability. The applied surface treatments resulted in the scattered sample roughness in the range of Sa = 0.3–15.8 µm, water contact angles of θ a p , w = 78°–106° and extremely low oil contact angles. Coating the samples more than doubled the surface roughness to Sa = 13.3–29 µm, whereas the initial surface treatment properties (structure, anisotropy, etc.) were entirely repressed by the coating properties. Coating led the water contact angles to increase to θ a p , w _ c o a t e d = 162°–173° and even more pronounced oil contact angles to increase to θ a p , o _ c o a t e d = 139°–150°, classifying the surfaces as superhydrophobic and oleophobic.

scholarly journals Does Surface Finishing Method Can Alter the Colour of Monolithic Zirconia Restoration?

2015 ◽  
Vol 19 (3) ◽  
pp. 128-131
Author(s):  
Ender Akan ◽  
Ibrahim Talha Meşe
Keyword(s):  
Surface Treatment ◽  
Surface Finishing ◽  
Treatment Methods ◽  
Colour Measurements ◽  
Before And After ◽  
Group A ◽  
Colour Changes ◽  
Monolithic Zirconia ◽  
Group B ◽  
Effect Of Surface

SummaryMonolithic zirconia restorations offer superior mechanic properties and improve indication of non-metallic restorations. Monolithic restorations eliminate bonding and chipping problems mostly seen in zirconia restorations. However, optical properties are insufficient. Colouring or staining is offer possibility to mask the opaque view of restoration. Polishing and glazing are also surface treatment methods for monolithic zirconia.In this study effect of surface treatment methods on final view of zirconia were evaluated. For this purpose 30 monolithic zirconia samples (inCoris TZI, Sirona, Bensheim, Germany) were prepared. The samples were divided into 3 groups: In group A (n=10), glazing was performed using Vita Glaze (Vita Zahnfabrik, Bad Saeckingen, Germany); In group B (n=10), polishing was performed by using Soflex polishing system (3M-ESPE, Neuss, Germany); in Group C (n=10), polishing and glazing were performed. Before and after the applied the surface treatment methods, colour measurements were performed with a spectrophotometer (Vita EasyShade Advanced, Vita Zahnfabrik, Bad Saeckingen, Germany). Data were analysed using paired sample t-test at the p≤0.05 level and one-way analysis of variance (ANOVA) combined with Tukey’s multiple comparison tests.In all groups there were alterations in colour values; however, ΔE< 3.7 and the colour changes were undetectable.

Fabrication of Super-Hydrophobic Film on Tinplate’s Surface by a Simple Casting Method in Material Engineering and its Application

2012 ◽  
Vol 583 ◽  
pp. 374-378
Author(s):  
Qi Long Liu ◽  
Hong Chen ◽  
Hai Yun Jiang ◽  
Ruo Mei Wu ◽  
Zhi Qing Yuan ◽  
...  
Keyword(s):  
Contact Angle ◽  
Composite Film ◽  
Hydrophobic Effect ◽  
Contact Angles ◽  
Casting Method ◽  
Sliding Angle ◽  
Water Contact ◽  
Drying Time ◽  
Practical Applications ◽  
Material Engineering

A simple, cheap and environmental double thin super-hydrophobic composite film was prepared on the surface of tinplate by a simple casting method. The contact angle and sliding angle were measured by an optical contact angle meter. And the major factors that influenced the super-hydrophobic effect of the composite film were studied in our work. The results showed that when the melting temperature was 120°C, the weight radio of PP and PP-g-MAH was 1:4, the drying time was 24h, the dosage of ethanol was 0.4ml, the composite film showed a satisfactory super-hydrophobicity and its water contact angles reached a maximum value of 156.6° while the sliding angle reached a minimum value of 2°. Because of anti-oxidation, moisture-proof and anticorrosion performance of super-hydrophobic tinplate, it has potential practical applications in packaging material engineering.

Hydrophobization of epoxy nanocomposite surface with 1H,1H,2H,2H-perfluorooctyltrichlorosilane for superhydrophobic properties

Open Physics ◽  
2012 ◽  
Vol 10 (5) ◽  
Author(s):  
Maciej Psarski ◽  
Jacek Marczak ◽  
Grzegorz Celichowski ◽  
Grzegorz Sobieraj ◽  
Konrad Gumowski ◽  
...  
Keyword(s):  
Surface Treatment ◽  
Contact Angles ◽  
Alumina Nanoparticles ◽  
Water Repellent ◽  
Sliding Angle ◽  
Water Contact ◽  
Epoxy Nanocomposite ◽  
Liquid Phases ◽  
Modified Surfaces ◽  
The Hierarchical Structure

AbstractNature inspires the design of synthetic materials with superhydrophobic properties, which can be used for applications ranging from self-cleaning surfaces to microfluidic devices. Their water repellent properties are due to hierarchical (micrometer- and nanometre-scale) surface morphological structures, either made of hydrophobic substances or hydrophobized by appropriate surface treatment. In this work, the efficiency of two surface treatment procedures, with a hydrophobic fluoropolymer, synthesized and deposited from 1H,1H,2H,2H-perfluorooctyltrichlorosilane (PFOTS) is investigated. The procedures involved reactions from the gas and liquid phases of the PFOTS/hexane solutions. The hierarchical structure is created in an epoxy nanocomposite surface, by filling the resin with alumina nanoparticles and micron-sized glass beads and subsequent sandblasting with corundum microparticles. The chemical structure of the deposited fluoropolymer was examined using XPS spectroscopy. The topography of the modified surfaces was characterized using scanning electron microscopy (SEM), and atomic force microscopy (AFM). The hydrophobic properties of the modified surfaces were investigated by water contact and sliding angles measurements. The surfaces exhibited water contact angles of above 150° for both modification procedures, however only the gas phase modification provided the non-sticking behaviour of water droplets (sliding angle of 3°). The discrepancy is attributed to extra surface roughness provided by the latter procedure.

scholarly journals Effect of Spontaneous and Water-Based Passivation on Components and Parameters of Ti6Al4V (ELI Grade) Surface Tension and Its Wettability by an Aqueous Solution of Sucrose Ester Surfactants

Molecules ◽  
2021 ◽  
Vol 27 (1) ◽  
pp. 179
Author(s):  
Joanna Krawczyk ◽  
Amparo María Gallardo-Moreno ◽  
María Luisa González-Martín
Keyword(s):  
Surface Tension ◽  
Aqueous Solutions ◽  
Surface Treatment ◽  
Water Environment ◽  
Surface Preparation ◽  
Contact Angles ◽  
Sucrose Ester ◽  
Water Interface ◽  
Water Contact ◽  
Solid Water

Solid wettability is especially important for biomaterials and implants in the context of microbial adhesion to their surfaces. This adhesion can be inhibited by changes in biomaterial surface roughness and/or its hydrophilic–hydrophobic balance. The surface hydrophilic–hydrophobic balance can be changed by the specifics of the surface treatment (proper conditions of surface preparation) or adsorption of different substances. From the practical point of view, in systems that include biomaterials and implants, the adsorption of compounds characterized by bacteriostatic or bactericidal properties is especially desirable. Substances that are able to change the surface properties of a given solid as a result of their adsorption and possess at least bacteriostatic properties include sucrose ester surfactants. Thus, in our studies the analysis of a specific surface treatment effect (proper passivation conditions) on a biomaterial alloy’s (Ti6Al4V ELI, Grade 23) properties was performed based on measurements of the contact angles of water, formamide and diiodomethane. In addition, the changes in the studied solid surface’s properties resulting from the sucrose monodecanoate (SMD) and sucrose monolaurate (SML) molecules’ adsorption at the solid–water interface were also analyzed. For the analysis, the values of the contact angles of aqueous solutions of SMD and SML were measured at 293 K, and the surface tensions of the aqueous solutions of studied surfactants measured earlier were tested. From the above-mentioned tests, it was found that water environment significantly influences the components and parameters of Ti6Al4V ELI’s surface tension. It also occurred that the addition of both SMD and SML to water (separately) caused a drop in the water contact angle on Ti6Al4V ELI’s surface. However, the sucrose monolaurate surfactant is characterized by a slightly better tendency towards adsorption at the solid–water interface in the studied system compared to sucrose monodecanoate. Additionally, based on the components and parameters of Ti6Al4V ELI’s surface tension calculated from the proper values of components and parameters of model liquids, it was possible to predict the wettability of Ti6Al4V ELI using the aqueous solutions of SMD and SML at various concentrations in the solution.

A self-healing fluorine-free superhydrophobic cotton fabric under heat stimulation

2021 ◽  
pp. 004051752110371
Author(s):  
Xue Yang ◽  
Jing Su ◽  
Jingjing Xiong ◽  
Hongbo Wang
Keyword(s):  
Cotton Fabric ◽  
Cotton Fabrics ◽  
Contact Angles ◽  
Alkaline Solutions ◽  
Self Healing ◽  
Immersion Method ◽  
Water Contact ◽  
Practical Applications ◽  
Washing Durability ◽  
Short Service Life

Superhydrophobic cotton fabrics have been widely explored for their excellent properties, although there are still a few limitations in the practical applications for the reasons of poor environmental performance and short service life. In this study, the hexadecyltrimethoxysilane emulsion was prepared using O2-plasma and ultrasound for the superhydrophobic functional finishing of raw cotton fabric by immersion method. The prepared cotton fabrics showed a superior hydrophobicity with water contact angles larger than 156.0°, as well as an excellent self-healing ability. This self-healing ability was gained by simple heating treatment, which could restore the superhydrophobicity of the hydrophilic cotton fabric damaged by abrasion or O2-plasma treatment. The superhydrophobic cotton fabrics demonstrated excellent washing durability, which can withstand 50 times accelerated laundering cycles. Besides this, the superhydrophobic coatings also displayed fair chemical stability in strong acidic and alkaline solutions. The prepared nonfluorinated superhydrophobic cotton fabric with self-healing ability shows a potential for practical functional textile application.

scholarly journals Physicochemical Properties of Cellulose Separators for Lithium Ion Battery: Comparison with Celgard2325

Materials ◽  
2018 ◽  
Vol 12 (1) ◽  
pp. 2 ◽  
Author(s):  
Jie Sheng ◽  
Ruibin Wang ◽  
Rendang Yang
Keyword(s):  
Tensile Strength ◽  
Lithium Ion Batteries ◽  
Heating Temperature ◽  
Low Cost ◽  
Lithium Ion ◽  
Contact Angles ◽  
Size Change ◽  
Plant Fibers ◽  
Water Contact ◽  
Practical Applications

High electrolyte wettability, thermal dimensional stability, and tensile strength are prerequisites for implementing separators in practical applications. In this study, we report on the discovery of nanofibril membranes derived from various plant fibers commonly used in the papermaking industry, for low cost and higher performances than the commercially available Celgard2325 in regard to the application of separators for lithium-ion batteries. Nanofibril membranes showed water contact angles as low as 18°, negligible size change at a heating temperature of 160 °C for 120 min, and tensile strength up to 137.6 MPa. The homogenization was found to strongly contribute to these improved performances. These findings suggest that the plant fiber-derived nanofibril membranes are anticipated to be promising candidates as separators for lithium-ion batteries.

scholarly journals Effect of sizing agent on interfacial properties of carbon fiber-reinforced PMMA composite

2021 ◽  
Vol 30 ◽  
pp. 2633366X2097865
Author(s):  
Li Jian
Keyword(s):  
Shear Strength ◽  
Surface Treatment ◽  
Photoelectron Spectroscopy ◽  
Resin Composite ◽  
Contact Angles ◽  
Static Contact ◽  
Before And After ◽  
C Value ◽  
Interlayer Shear Strength ◽  
Pmma Resin

The surface treatment of carbon fibers (CFs) was carried out using a self-synthesized sizing agent. The effects of sizing agent on the surface of CFs and the interface properties of CF/polymethyl methacrylate (PMMA) composites were mainly studied. Scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and static contact angle were used to compare and study the CFs before and after the surface treatment, including surface morphology, surface chemical element composition, and wettability of the surface. The influence of sizing agent on the mechanical properties of CF/PMMA resin composite interface was investigated. The results show that after sizing treatment, the CF surface O/C value increased by 35.1% and the contact angles of CF and resin decreased by 16.2%. The interfacial shear strength and interlayer shear strength increased by 12.6%.

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