Abstract
In this study, two systems of bio-ceramic coating (45S5 bioactive glass and hydroxyapatite) were used in order to compare between them for biomedical applications. Each system consists from two layers of coating done by electrophoretic deposition (EPD) technique on 316L stainless steel material as substrate. Two types of biopolymer were used (Chitosan with Gelatin) as first layer of coating. Taguchi approach with L9 array was used in order to choose the best conditions (concentrations, voltage and time) for coating layers. Each system consists of two layer (biopolymer (first layer) and bioceramic (second layer)) materials. The optimum parameters for first layer of biopolymer was (3g/L concentration, 20 voltage and 3 minute) while optimum parameter for second layer (6g/L concentration, 30 voltage and 1 minute) for two bioceramic group. Zeta potential test were employed to measure suspensions stability. The tape test method was used to evaluate the adhesion between substrate and coating layers, the results show that the percentage of removal area for optimum coating layer (biopolymer, 45S5 BG and HA 8.06%, 10.668%, 6.23% subsequently). XRD inspection was used for identify the phases of coating layers. The Cyclic polarization test was used for evaluation of pitting corrosion resistance, the results show all layers gives good corrosion resistance but 45S5BG gives the best corrosion resistance when compared with HA system.
Highlights
During the last a few decades the demand for artificial implants has dramatically increased [1, 2]
The aim of this study is combination between gelatin and chitosan as first layer on 316L stainless steel substrate to control on degradation rate, improve biocompatibility, decrease ion release, adhesion with substrate as first layer and as separating layer between layer and second layer will be mixing of bio-ceramic (Bioglass® (45S5) or HA) suspension with chitosan suspension
Measurements of the solution stability for these optimum levels were obtained by zeta potential for gelatin- chitosan suspension; it was (77.38 mV)
Summary
During the last a few decades the demand for artificial implants has dramatically increased [1, 2]. Practical solution has been applied, it was coating 316L stainless steel substrate by bio-ceramics materials for improve its biological and antimicrobial properties [8]. There are three types of surface bioactive ceramics (Hydroxyapatite and related calcium phosphates , bioactive glasses and glassceramics) [10].The bio ceramic coatings protecting the metallic implants and orthopedic /dental devices from corrosion when in contact with body fluids. The aim of this study is combination between gelatin and chitosan as first layer on 316L stainless steel substrate to control on degradation rate, improve biocompatibility, decrease ion release , adhesion with substrate as first layer and as separating layer between layer and second layer will be mixing of bio-ceramic (Bioglass® (45S5) or HA) suspension with chitosan suspension. (Hydroxyapatite less than 40nm purchased from Sky spring Nanomaterial’s, USA). 4. (Deionized water, solvents of ethanol absolute (99.9%), Acetic acid with purity (99.5%))
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