TY  - BOOK
AU  - Sharma,Chirag
AU  - Kashyap. B.P.
TI  - Development Of Biocompatible Super Hydrophobic Coating On Degradable Magnaesium Implants
U1  - 620.112 
PY  - 2020///
CY  - IIT Jodhpur
PB  - Department of Metallurgical & Materials Engineering
KW  - Biocompatible Super Hydrophobic Coating
KW  - MTech Theses
KW  - Department of Metallurgical & Materials Engineering
N2  - Traditional medical implants are designed to stay in body permanently which cause several complication and allergies in long run. This has attracted the focus on development of biodegradable metallic implant which will wash off from body once their purpose is served. In this context the magnesium based biodegradable implant has drawn considerable attention in recent year due to their superior biocompatibility. However, their high degradation rate and lower mechanical strength poses a challenge in their wide spread application. It losses it mechanical integrity before bone tissue is healed to an acceptable level. In present work a biocompatible liquid repellent super hydrophobic coating is developed on casted Mg4Zn alloy to address the high degradation rate. One set of sample is pretreated with saturated solution of sodium carbonate to form a passive layer of magnesium carbonate and other set of samples are coated with hydroxyapatite powder using plasma spraying which improve the cell attachment (osseointegration) behavior. Polydimethylsiloxane(PDMS) is used as low surface energy material to create super hydrophobic coating.  The corrosion rate of hydroxyapatite coated sample has reduced from 1.24*10-2 gm/mm2year to 6.1*10-5 gm/mm2year. The physical appearance of sample show no delamination of coating is observed even after 7 days of immersion in simulated body fluid. The hydrogen evolution data for the same sample show that total volume of H2 gas liberation during corrosion is reduced from 115.7 ml to 21.0 ml. This help in avoid hydrogen gas pockets which can be fatal nearby cell if not displaced in time. Similarly, for chemical conversion coated sample the corrosion rate is reduced from 1.05*10-2 gm/mm2year to 2.1*10-3 gm/mm2year. Present research open gate for various potential application of super hydrophobic coating in medical industries and gives a prospective to approach the future problem by keeping in mind the hydrophobic coating as tool in available in box.

ER  -