Scratching the surface Aaron Byrne, Brendan Duffy CREST, Technological University Dublin, Ireland
Nanoscratch technology has proven to be reliable asset in characterising thin coatings. The nanoscratch utilises a variety of diamond indenter tips to characterise sample hardness, adhesion, coefficient of friction, and surface failure. These techniques have also been applied to commercial proprietary automotive and medical device coatings to evaluate their mechanical performance. Samples are subjected to scratch and indentation analysis, whilst being visualised using optical microscopy and scanning electron microscopy. Traditionally, the use of paraffin was used to enhance the aesthetic appearance of automotive surfaces. These coatings are short-lived and require regular reapplication to maintain performance. More recently, the use of ‘’nanoceramic’’ coatings have become popular in the automotive industry. Such ceramic coatings are most applicable to parts/areas that are more susceptible or exposed to wear. Their objective is to better surface longevity whilst improving or retaining desirable characteristics that are inherent to the substrate material. 1 Through nanoindentation and scratch analysis, coating hardness and scratch resistance can be evaluated. The use of catheters today is commonplace, but catheters have been used as a method to drain the bladder for over 3500 years. 2 They are used in a many medical procedures such as thrombectomy 3 , urinary 2 , cardiovascular 4 , and neurovascular catheterisation. Catheters must display low coefficient of friction when hydrated and passing through vascular pathways as to minimise damage to vessel walls. This can be evaluated through nanoscratch analysis where the interaction between an indenters tip and the device surface can be investigated in conditions like the human body. This poster will present results from the testing of these materials with this new technique and extrapolating valuable information. References 1. R. Köse, L. Urtekin, A. Ceylan, S. Salman and F. Findik, Ind. Lubr. Tribol. , 2005, 57 , 140–144. 2. R. C. L. Feneley, I. B. Hopley and P. N. T. Wells, J. Med. Eng. Technol. , 2015, 39 , 459–470. 3. CIRSE, CIRSE Thrombectomy, thrombectomyhttps://www.cirse.org/patients/ir-procedures/thrombectomy/, (accessed 5 August 2022). 4. M. P. Heintzen and B. E. Strauer, Peripher. Arter. Komplikationen nach Herzkatheteruntersuchung.
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