scholarly journals Investigation into Effect of Natural Shellac on the Bonding Strength of Magnesium Substituted Hydroxyapatite Coatings Developed on Ti6Al4V Substrates

Coatings ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 933
Author(s):  
Ritwik Aravindakshan ◽  
Kaiprappady Kunchu Saju ◽  
Reghuraj Aruvathottil Rajan
Keyword(s):  
Cell Proliferation ◽  
Bonding Strength ◽  
Film Coating ◽  
Dip Coating ◽  
Thin Film Coating ◽  
Coated Substrate ◽  
Hydroxyapatite Coatings ◽  
The Stability ◽  
Dip Coating Technique ◽  
Dipping Time

The bioactive and biocompatible properties of hydroxyapatite (HA) promote the osseointegration process. To enhance other bio-functions of HA such as improving the antibacterial property of the implant, increasing the rate of cell proliferation, or improving tissue generation capability, HA is substituted with many elements such as Zn, Cl, Ba, Fe, Cu, Ag, Sr, F, Na, etc. This study reports development of Magnesium substituted HA (Mg-HA) coatings on Ti6Al4V substrates using the dip coating technique. To improve the adhesion and stability of the coating, an intermediate layer of shellac was applied between the coating and Ti6Al4V substrate. The dip coating process parameters were optimized using the Taguchi technique and it was found that dipping time of 35 s and 13% w/w of shellac concentration provided the maximum bonding strength of 12.5 MPa. The biocompatibility, dissolution, and corrosion study of the developed coating using the optimal parameters obtained were carried out in this study. An improvement in cell growth and cell proliferation was observed in the extract medium prepared from coated substrates. Release of Ca, P and Mg ions from the surface of the coated substrate into the simulated body fluid (SBF) was found to be almost constant which shows the stability of the thin film coating formed. The Mg-HA coated substrate also exhibited better corrosion resistance than the uncoated substrate.

scholarly journals Cr–ZnO nanostructured thin film coating on borosilicate glass by cost effective sol–gel dip coating method

2018 ◽  
Vol 9 (4) ◽  
pp. 777-782 ◽  
Author(s):  
Rupeshkumar V. Ramani ◽  
Bharat M. Ramani ◽  
Anjana D. Saparia ◽  
Chirag Savaliya ◽  
K.N. Rathod ◽  
...  
Keyword(s):  
Thin Film ◽  
Borosilicate Glass ◽  
Sol Gel ◽  
Cost Effective ◽  
Film Coating ◽  
Dip Coating ◽  
Thin Film Coating ◽  
Nanostructured Thin Film ◽  
Coating Method ◽  
Dip Coating Method

The Oxidation Stability of Boron Nitride Thin Films on MgO and TiO2 Substrates

1991 ◽  
Vol 250 ◽  
Author(s):  
Xiaomei Qiu ◽  
Abhaya K. Datye ◽  
Robert T. Paine ◽  
Lawrence. F. Allard
Keyword(s):  
Thin Film ◽  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Oxidation Stability ◽  
Film Coating ◽  
Thin Film Coating ◽  
Film Coatings ◽  
Thin Film Coatings ◽  
Transmission Electron ◽  
The Stability

AbstractThe stability of BN thin film coatings (2–5 nm thick) on MgO and TiO2 substrates was investigated using transmission electron microscopy (TEM). The samples were heated in air for at least 16 hours at temperatures ranging from 773 K - 1273 K. On MgO supports, the BN thin film coating was lost by 1073 K due to a solid state reaction with the substrate leading to formation of Mg2B2O5. No such reaction occurred with the TiO2 substrate and the BN was stable even at 1273 K. However, the coating appeared to ball up and phase segregate into islands of near-graphitic BN and clumps of TiO2 (rutile). The oxidizing treatment appears to promote the transformation from turbostratic BN to graphitic BN.

Measurement and Characterization of CeO2-TiO2 Ion Storage Films for Electrochromic Devices

2017 ◽  
Vol 726 ◽  
pp. 276-281
Author(s):  
Wei Shan Wu ◽  
Xiao Ping Liang ◽  
Jun Wang ◽  
Peng Chen ◽  
Wei Zhang ◽  
...  
Keyword(s):  
Sol Gel ◽  
Dip Coating ◽  
Optical Measurements ◽  
Molar Ratio ◽  
Nitrate Hexahydrate ◽  
Electrochromic Devices ◽  
Molar Ratios ◽  
Ion Storage ◽  
The Stability ◽  
Dip Coating Technique

CeO2-TiO2 sols and films were prepared by sol-gel method. The precursor sols consist of a mixture of cerium nitrate hexahydrate Ce(NO3)3·6H2O, butyl titanate Ti(OC4H9)4 and anhydrous ethanol CH3CH2OH. The films were deposited using the dip-coating technique and calcined at 310 °C in an oxygen atmosphere. The effects of the molar ratios of cerium to titanium（0.55:1, 0.70:1, 0.85:1, 1:1）on the microstructure and properties of (CeO2)x-TiO2 films were investigated. The surface morphology, electrochemical performance and optical property were characterized by FE-SEM, cyclic voltammetry (CV) and UV-Visible spectrometer, respectively. The results show that the properties of the films are tightly related to cerium to titanium ratio. When the molar ratio of cerium to titaniumis 0.85:1, the ion storage capacity value of CeO2-TiO2 film is 19.99mC/cm2, whereas the pure TiO2 film is 11.52mC/cm2. The stability tests and optical measurements confirm that the developed CeO2-TiO2 films can be use as ion storage-counter eletrodes in electrochromic devices.

POLYMER-ASSISTED DEPOSITION OF HYDROXYAPATITE COATINGS USING ELECTROPHORETIC TECHNIQUE

2014 ◽  
Vol 26 (06) ◽  
pp. 1450073 ◽  
Author(s):  
Hassan Mehboob ◽  
Muhammad Awais ◽  
Hamad Khalid ◽  
Aqif Anwar Ch ◽  
Saadat Anwar Siddiqi ◽  
...  
Keyword(s):  
Physical Vapor Deposition ◽  
Dip Coating ◽  
Phase Changes ◽  
Steel Plates ◽  
Morphological Properties ◽  
Phase Identification ◽  
Electrophoretic Technique ◽  
Hydroxyapatite Coatings ◽  
The Stability ◽  
Dental Applications

Hydroxyapatite (HA) finds use as powder, scaffold, paste, and coatings for orthopedic and dental applications. Plasma spraying is the most commonly used technique to coat HA on metallic implants. However, undesirable phase changes at high temperatures encourage to adopt ambient temperature deposition techniques such as dip coating, electrophoretic, and physical vapor deposition (PVD). Electrophoretic technique is being used extensively to deposit HA, however sintering is required after the deposition to enhance adhesion of coatings to the substrate. In the present work, polyethylene glycol (PEG) modified HA was deposited on 316L Stainless Steel plates using electrophoretic deposition (EPD), which improved the binding strength of the HA to the substrate with increased packing density of HA particles without the need of sintering. PEG is a biocompatible and soluble polymer that helps HA to bond well with the substrate and in addition, prevents the agglomeration and precipitation of HA. Phase identification and crystal structure of the coatings were determined using X-ray diffraction (XRD). The stability of the coatings was assessed by Fourier transform infrared spectroscopy (FTIR), whereas scanning electron microscopy (SEM) was utilized in order to investigate the morphological properties of the deposited coatings. The mechanical properties of the coatings were investigated using the indentation testing that depicted an enhanced level of adhesion of coatings to the substrate.

scholarly journals Facile polypyrrole thin film coating on polypropylene membrane for efficient solar-driven interfacial water evaporation

RSC Advances ◽  
2017 ◽  
Vol 7 (16) ◽  
pp. 9495-9499 ◽  
Author(s):  
Xiayun Huang ◽  
Yi-Hsin Yu ◽  
Oscar L. de Llergo ◽  
Samantha M. Marquez ◽  
Zhengdong Cheng
Keyword(s):  
Thin Film ◽  
Film Coating ◽  
Dip Coating ◽  
Water Evaporation ◽  
Interfacial Water ◽  
Vapor Generation ◽  
Thin Film Coating ◽  
Polypropylene Membrane ◽  
Coating Method ◽  
Dip Coating Method

Facile dip-coating method to fabricate robust polypyrrole thin film coating on thermal insulation polypropylene membrane with solar vapor generation efficiency of 72%.

Influence of HCl Content and Ageing Time on TiO2 Coating Formation in Acidic Sol-Gel Solutions

2016 ◽  
Vol 694 ◽  
pp. 138-142
Author(s):  
Muharniza Azinita Musa ◽  
Jariah Mohd Juoi ◽  
M.R. Zulkifli ◽  
Norashidah Masrom
Keyword(s):  
Ageing Time ◽  
Substrate Surface ◽  
Sol Gel ◽  
Dip Coating ◽  
Ceramic Tiles ◽  
Coating Formation ◽  
Ageing Period ◽  
The Stability ◽  
Physical Changes ◽  
Dip Coating Technique

Acidic TiO2 solutions were prepared via sol-gel using hydrochloric acid (HCl) as catalyst for TiO2 coating deposition. The correlation between the HCl content and ageing time with the stability of the solutions was determined by controlling the content of HCl used (0.2, 0.5, 1.0 and 1.7 ml). The stability was evaluated by observing the pH and physical changes that occurred during 30 days of ageing time. The influence of HCl content on the morphology of TiO2 thin film is further studied by depositing the films on commercialized unglazed ceramic tiles via dip-coating technique. Results of the ageing experiment showed that the PH of the solutions was stable throughout the ageing period. However, significant physical changes occurred only during the first seven days of the ageing period. Energy dispersive X-ray (EDX) analysis disclosed that the TiO2 coatings were distributed unevenly on the substrate surface creating multilayers of coating. Scanning electron microscope (SEM) micrographs suggest that the TiO2 solution prepared using 0.5ml of HCl (pH 1.0 – 1.5) produces better TiO2 coating performance due to less amount of cracks and more homogeneous coating than other HCl content solutions.

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