scholarly journals Hydrothermal Surface Treatment of Biodegradable Mg-Materials

Metals ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 894 ◽  
Author(s):  
Andrzej Miklaszewski ◽  
Kamil Kowalski ◽  
Mieczyslaw Jurczyk
Keyword(s):  
Corrosion Resistance ◽  
Hydrothermal Treatment ◽  
Ethylenediaminetetraacetic Acid ◽  
Disodium Salt ◽  
Layer Formation ◽  
Surface Wetting ◽  
Wetting Properties ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
Powder Metallurgy Route

Paper presents study on the hydrothermal treatment for hydroxyapatite layer formation on the different biodegradable Mg-substrates. The evaluation of corrosion resistance in Ringer’s solution and contact angle measurements in glycerol were performed. Alloys and composites substrates obtained by mechanical alloying and powder metallurgy route are characterized by submicron range microstructure, which is responsible for further surface processing characteristic. Hydrothermal treatment in Ca-EDTA (ethylenediaminetetraacetic acid calcium disodium salt) led to formation of hydroxyapatite layers, which improves both the corrosion resistance and surface wetting properties compared to microcrystalline magnesium.

scholarly journals Publisher Correction: Surface-wetting characterization using contact-angle measurements

2018 ◽  
Vol 14 (7) ◽  
pp. 2259-2259
Author(s):  
Tommi Huhtamäki ◽  
Xuelin Tian ◽  
Juuso T. Korhonen ◽  
Robin H. A. Ras
Keyword(s):  
Contact Angle ◽  
Surface Wetting ◽  
Angle Measurements ◽  
Contact Angle Measurements

Corrosion Resistance of Hybrid Films Applied on TiN Plate: Precursor Solution Acidified with Hydrochloric Acid

2014 ◽  
Vol 775-776 ◽  
pp. 370-374
Author(s):  
Sandra Raquel Kunst ◽  
Gustavo Alberto Ludwig ◽  
Cláudia Trindade Oliveira ◽  
Joseane Santana ◽  
Victor Hugo Vitorino Sarmento ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Hydrochloric Acid ◽  
Crack Formation ◽  
Hybrid Film ◽  
Precursor Solution ◽  
Dip Coating ◽  
Hybrid Films ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
Alkoxide Precursors

The aim of this work is to coat tin plate with a hybrid film obtained from a sol consisting of alkoxide precursors: 3 - (trimethoxysilylpropyl) methacrylate (TMSM), poly (methyl methacrylate) PMMA with and without tetraethoxysilane (TEOS) addition. The pH = 3 was adjusted with hydrochloric acid. The films were obtained by dip-coating process, cured for 3 hours at 160 ° C, and characterized for their electrochemical behavior. The hydrophobicity of the film was determined by the contact angle measurements and its morphology was evaluated by SEM. Results showed that the hybrid films studied presented good performance concerning their corrosion resistance in tin plate. Besides the addition of TEOS, it has contributed to the increase of the film thickness, however at the same time promoting the crack formation, which compromises the corrosion resistance of the coated tin plate.

Polyurethane Coating on Coronary Stents

2007 ◽  
Vol 345-346 ◽  
pp. 1269-1272 ◽  
Author(s):  
Eszter Bognár ◽  
György Ring ◽  
Hilda Zsanett Marton ◽  
János Dobránszky ◽  
János Ginsztler
Keyword(s):  
Contact Angle ◽  
Energy Dispersive Spectrometry ◽  
Coronary Stents ◽  
Polyurethane Coating ◽  
Polyurethane Coatings ◽  
Wetting Properties ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
Tube Shape ◽  
Scanning Electron

Stents are special metallic or polymer endoprostheses of meshed structure and tube shape. Their function is to prevent restenosis in the arteries. Stents can be coated or uncoated. In the expanded part of the artery the chance of restenosis is bigger even without a stent so it is practical to coat the stents. The aim of this work is to present the results of the coating experiments made on the coronary stents. Three types of commercially available polyurethanes were used for these experiments. The coatings were produced by a dipping method. Electro-polished and non-electro-polished metallic sheets and stents were used for these experiments. Contact angle measurements were done to examine the wetting properties of the three different polyurethane coatings. The quality and the changing of the coatings were examined by different methods (stereomicroscope, scanning electron microscope and energy dispersive spectrometry).

Hierarchical Reinforcing Fibers for Energy Harvesting Applications - A Strength Study

2019 ◽  
Vol 827 ◽  
pp. 252-257
Author(s):  
George Karalis ◽  
Christos Mytafides ◽  
Anastasia Polymerou ◽  
Kyriaki Tsirka ◽  
Lazaros Tzounis ◽  
...  
Keyword(s):  
Fiber Strength ◽  
Glass Fibers ◽  
Solvothermal Reaction ◽  
Ongoing Research ◽  
Wetting Properties ◽  
Advanced Composite ◽  
Angle Measurements ◽  
Structural Applications ◽  
Contact Angle Measurements ◽  
Reinforcing Fibers

This work is concerned with the study of the strength of nanocoated reinforcing fibers. In more detail, glass fibers were coated with an efficient thermoelectric (TE) ink in order to create multifunctional reinforcing fibers for advanced composite structural applications. The main scope is to evaluate the fracture properties of the TE-enabled hierarchical glass fibers. The hybrid nanocrystal TE ink was synthesized via a solvothermal reaction and further fully characterized in coating form. The morphology and wetting properties of the TE ink deposition onto glass fibers were evaluated via SEM and contact angle measurements. Enhanced values by 19.4% in tensile strength for the coated glass fibers compared to the reference are being reported, measured at single fiber level. The evaluated multifunctional glass fiber strength will be utilised during ongoing research for the interfacial shear strength determination.

scholarly journals Surface-wetting characterization using contact-angle measurements

2018 ◽  
Vol 13 (7) ◽  
pp. 1521-1538 ◽  
Author(s):  
Tommi Huhtamäki ◽  
Xuelin Tian ◽  
Juuso T. Korhonen ◽  
Robin H. A. Ras
Keyword(s):  
Contact Angle ◽  
Surface Wetting ◽  
Angle Measurements ◽  
Contact Angle Measurements

Influence of Thermal Treatment on the Roughness, Corrosion Resistance and Wettability of Hydroxyapatite Films Deposited by RF Magnetron Sputtering

2013 ◽  
Vol 587 ◽  
pp. 297-302 ◽  
Author(s):  
Mihaela Dinu ◽  
Adrian Emil Kiss ◽  
Anca C. Parau ◽  
Viorel Braic ◽  
Catalin Vitelaru ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Magnetron Sputtering ◽  
Corrosion Behaviour ◽  
Rf Magnetron Sputtering ◽  
Contact Angles ◽  
Sputtering Deposition ◽  
Electrochemical Tests ◽  
Angle Measurements ◽  
Hydroxyapatite Coatings ◽  
Contact Angle Measurements

In this paper we report on the preparation and characterization of hydroxyapatite coatings deposited on Ti6Al4V alloy by magnetron sputtering deposition method. The amorphous deposited coatings were thermal annealed in a flux of dry nitrogen and water vapours at 800 °C for 30 and 120 minutes, in order to investigate the effect of this treatment on surface roughness, corrosion resistance and wettability. The films were characterized by surface profilometry, electrochemical tests and contact angle measurements. After annealing, the hydroxyapatite coatings became crystalline, exhibiting rougher surfaces, higher corrosion resistance and lower contact angles. We have demonstrated that the hydroxyapatite coating annealed at 800°C for 30 minutes represents a good candidate to be used for medical implants, due to its superior corrosion behaviour and good wettability.

SURFACE CHARACTERIZATION OF ZrO2/Zr COATING ON Ti6Al4V AND IN VITRO EVALUATION OF CORROSION BEHAVIOR AND BIOCOMPATIBILITY

2017 ◽  
Vol 24 (Supp01) ◽  
pp. 1850003
Author(s):  
RUOYUN WANG ◽  
YONGHUA SUN ◽  
XIAOJING HE ◽  
YUEE GAO ◽  
XIAOHONG YAO
Keyword(s):  
Corrosion Resistance ◽  
Magnetron Sputtering ◽  
Surface Characterization ◽  
Hybrid Approach ◽  
Treatment Technique ◽  
Electrochemical Tests ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
Micro Arc Oxidation

Biocompatibility is crucial for implants. In recent years, numerous researches were conducted aiming to modify titanium alloys, which are the most extensively used materials in orthopedic fields. The application of zirconia in the biomedical field has recently been explored. In this study, the biological ZrO2 coating was synthesized on titaniumalloy (Ti6Al4V) substrates by a duplex-treatment technique combining magnetron sputtering with micro-arc oxidation (MAO) in order to further improve the corrosion resistance and biocompatibility of Ti6Al4V alloys. The microstructures and phase constituents of the coatings were characterized by scanning electron microscope (SEM) equipped with energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD), the surface wettability was evaluated by contact angle measurements. The results show that ZrO2 coatings are porous with pore sizes less than 2[Formula: see text][Formula: see text]m and consist predominantly of the tetragonal ZrO2 (t-ZrO[Formula: see text] and cubic ZrO2(c-ZrO[Formula: see text] phase. Electrochemical tests indicate that the corrosion rate of Ti6Al4V substrates is appreciably reduced after surface treatment in the phosphate buffer saline (PBS). In addition, significantly improved cell adhesion and growth were observed from the ZrO2/Zr surface. Therefore, the hybrid approach of magnetron sputtering and MAO provides a surface modification for Ti6Al4V to achieve acceptable corrosion resistance and biocompatibility.

scholarly journals Mesoporous Silica SBA-15 Particles in a Detergent Solution as Abrasive and Coating Material for Household Care Cleaning Products

2019 ◽  
Vol 3 (1) ◽  
pp. 12
Author(s):  
Athanasios Plomaritis ◽  
Dimitris Giliopoulos ◽  
Konstantinos Triantafyllidis ◽  
Margaritis Kostoglou ◽  
Thodoris D. Karapantsios
Keyword(s):  
Mesoporous Silica ◽  
Coating Layer ◽  
Detergent Solution ◽  
Cleaning Process ◽  
Large Area ◽  
Wetting Properties ◽  
Left Behind ◽  
Angle Measurements ◽  
Cleaning Products ◽  
Contact Angle Measurements

Cleaning products have improved a lot in the last century. The reason for this improvement is not only the use of new surfactants, but also the use of additives that either increase the efficiency of surfactants or act as abrasive agents that increase the mechanical friction during the cleaning process. In this study mesoporous silica (SBA-15) particles are suggested as abrasive additives to a reference detergent as they have a quite soft structure and their shape can act as micro-sponge to collect large amounts of dirt. Indeed, SBA-15 performs very well when added to the detergent, decreasing the effort for primary cleaning of a surface. Furthermore, the properties of the coating layer left behind after primary cleaning with SBA-15 are also examined (i.e., secondary cleaning). It is found that SBA-15 offers no benefit for secondary cleaning. In order to explain this finding, the effect of SBA-15 on the wetting properties of different substrates is studied. It is seen that the SBA-15 coating layer is not uniform. Furthermore, it is seen that dirt is capable of pushing away the coating layer and occupying a large area on the substrate. Contact angle measurements indicate that the substrates become more omniphilic in the presence of SBA-15 coating.

Mechanical and Wettability Performance of Sand/HDPE Composite Sheets

2020 ◽  
Vol 1015 ◽  
pp. 9-14
Author(s):  
Sidra Siraj ◽  
Ali Al Marzouqi ◽  
M.Z. lqbal
Keyword(s):  
Contact Angle ◽  
Maleic Anhydride ◽  
High Density Polyethylene ◽  
Mechanical Performance ◽  
Good Alternative ◽  
Surface Wetting ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
Compatibilizing Agent ◽  
Potential Use

Polymer/composite sheets were developed using sand as the filler, and high-density polyethylene (HDPE), by melting extrusion in a melt blender followed by compression molding. The effects of addition of filler, and the addition of polyethylene grafted maleic anhydride (PE-g-MA) as the compatibilizing agent were investigated by observing the morphology, the mechanical performance as well as the wettability characteristic via contact angle measurements. A decreasing trend was observed with filler addition, both for the Young’s modulus and yield stress values of each of the samples, from 1200.81 MPa and 35.15 MPa at 0 wt% to 1182.33 MPa and 23.11 MPa for the non-compatibilized sheet at 35 wt%, to 629.95 MPa and 9.56 MPa in the case of the compatibilized sheet respectively. However, addition of filler did not significantly affect the surface wetting in any case, thereby promoting good anti-wetting performance for both sets of sheets. As a result, the potential use of such synthetic composite sheets could be considered as a good alternative for applications which require reduced ductility or increased anti-wetting performance.

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