Advanced Functional and Structural Thin Films and Coatings: LIVESTREAMED SESSION: Young Talents in Research/Multifunctional Biomaterials, Innovative Approaches to New Concepts and Applications
Sponsored by: TMS: Thin Films and Interfaces Committee
Program Organizers: Ramana Chintalapalle, University of Texas at El Paso; Adele Carrado, University of Strasbourg - IUT LP / IPCMS - CNRS; Gerald Ferblantier, University of Strasbourg - IUT LP / ICube Laboratory - CNRS; Karine Mougin, CNRS, IS2M; Heinz Palkowski, Clausthal University of Technology; Nuggehalli Ravindra, New Jersey Institute of Technology

Tuesday 2:30 PM
March 1, 2022
Room: 204B
Location: Anaheim Convention Center

Session Chair: Adele Carrado, IPCMS - CNRS, Université de Strasbourg, France; Heinz Palkowski, TU-Clausthal IMET

2:30 PM Introductory Comments

2:35 PM  Invited
Challenges of TiN Thin Film Coating Development and Deposition onto Medical Grade Thermoplastic Polyurethane (TPU) Used in Biomedical Devices: Maren Fossum1; Kari Kjørholt1; Javier Sanchez2; Christoph Burgstaller3; Richard Olsson4; Ragnhild Aune1; 1Norwegian University of Science and Technology; 2Danderyd Hospital at Karolinska Institute (DS KI); 3TCKT - Transfercenter für Kunststofftechnik ; 4KTH Royal Institute of Technology
     When designing biomedical devices, the use of surface modification has proven to be a strategic approach as it allows for improved surface properties while benefiting from the favourable mechanical properties of the bulk material. In the present study two generations of titanium nitride (TiN) thin film coatings (30 and 50 nm) deposited onto medical grade thermoplastic polyurethane (TPU) by magnetron sputtering have been developed and their engineering performance characterized. The challenges of thin film development and deposition onto polymeric substrates are discussed in view of changes in the deposition process compared to deposition onto silicon wafers due to potential outgassing of water and/or oxidation. Moreover, the impact of sputtering method and experimental conditions, coating and substrate thickness, surface roughness, and coating adhesion are also discussed. The overall performance of the TiN coatings has been evaluated against the performance of non-coated substrates and substrates coated with a commercial coating.

3:05 PM  Invited
Polymer Grafting on Metal Surfaces Using “Grafting from” Chemical Method: Flavien Mouillard1; Oumaima Laghzali1; Patrick Masson1; Genevieve Pourroy1; Adele Carrado1; 1CNRS UMR7504
    Surface modification is an approach used to protect materials, especially to prevent corrosion. For this, some methods are used: dry coating (thermal spraying, sputtering, cold spraying) and wet coating techniques to form covalent bonding (“grafting from”, “grafting to”) or non-covalent bonding (electrochemical, electrodeposition, layer-by-layer, freeze-drying, casting, sol-gel). The formation of covalent bonds allows a more stable protective layer. This talk reports on the relationship between processing, characterization and biological performance of thin films e.g. poly(methyl methacrylate) (PMMA) and poly(butyl methacrylate) (PBMA) on titanium (Ti), alloys based on zinc (Zn) and magnesium (Mg). These combinations are expected as a solution for as promising biodegradable medical devices. The “grafting from” method has been developed for covering: (i)Ti-based plates by P(MMA-co-BMA) layers to built-up craniofacial prosthesis and replace the bone to enhance the formability of the prosthesis and (ii)alloys based on Zn and Mg by PMMA layer to improve corrosion resistance.

3:35 PM  Invited
Metal Mesh Reinforced Polymers: An Interesting Alternative for Biomedical Applications: Gargi Nayak1; Heinz Palkowski2; 1TU Clausthal; 2Tu Clausthal
    Polymers generally possess great biocompatibility but their lack of mechanical properties hinder their application range for hard-tissue implant applications. One way to overcome this drawback is to reinforce polymers with biocompatible metal meshes. The interlocking between metal and polymer layers will decrease the level of deformation, thus increasing the stiffness of the final material. In this study, this effect has been investigated by preparing PMMA-Ti mesh sandwiches, where vol% of Ti mesh has been increased via increasing the layers of Ti mesh in PMMA. With increase in vol% of Ti mesh, a gradual increase in stiffness has been observed. The tensile, bending and fatigue properties of such composites will also be investigated in this study to illustrate the possibility of shaping this material for implant applications.

4:05 PM Break

4:25 PM  Cancelled
Effect of Post-deposition Annealing on the Structure and Optical Properties of GeO2 Thin Films: Paul Nalam1; Debabrata Das1; Ramana Chintalapalle1; 1The Center for Advanced Materials Research, The University of Texas at El Paso
    Germanium dioxide (GeO2), which an ultra-wide band gap material, has been explored in depth due to its promising thermal, optical, and electrical properties. While GeO2 films exhibit quite interesting electronic properties, such as a high dielectric constant and refractive index, understanding the process-property correlation is the key to tailor their device performance. In this work, GeO2 films (100 nm) were deposited onto Si(100) substrates using sputtering in an oxidizing environment. The post-deposition annealing was performed at 800-1200°C in order to study the temperature-induced effects on the structure, morphology, and optical properties of GeO2 films. While the as-deposited GeO2 films were amorphous, increasing temperature induces amorphous-to-crystalline transformation. At 800°C, GeO2 films exhibit hexagonal phase and then a clear phase transition to tetragonal structure at 1000°C. Correspondingly, the optical quality and band gap variation is noted in annealed GeO2 films. The results will be presented and discussed to establish the structure-property correlation.

4:55 PM  
Effects of Femtosecond Laser Shock Peening on the Tribocorrosion Resistance of Biodegrade WE43 Magnesium Alloys : Wenbo Wang1; Chang-Yu Hung1; Leslie Howe1; Jia Chen1; Kaiwen Wang1; Vinh Ho1; Shannon Lenahan1; Mitsuhiro Murayama1; Nguyen Vinh1; Wenjun Cai1; 1Virginia Polytechnic Institute and State University
    Magnesium (Mg) alloys are promising candidates for use as degradable implant materials. However, the fast degradation of Mg alloys in physiological environments makes it challenging to ensure structural integrity over the required time for tissue and bone healing. On the other hand, high surface friction and wear debris formation in load-bearing implants can produce an undesirable inflammatory reaction. Hence, an effective method that simultaneously optimizes the wear and corrosion resistance, i.e., tribocorrosion resistance of Mg alloys is needed. In this study, the effects of femtosecond laser shock peening (fs-LSP) on the tribocorrosion properties of WE43 Mg alloys were investigated in stagnant blood bank buffered saline under 37 °C. Materials characterization via transmission electron microscope are combined with finite element simulations to reveal the underlying structural evolutions and residual stress generations during fs-LSP, which were responsible for the enhanced tribocorrosion resistance of WE43 Mg alloys.

5:15 PM Concluding Comments