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Nattasit Dancholvichit
Department of Mechatronics Engineering
Rajamangala University of Technology Rattanakosin, Thailand
Nattasit Dancholvichit is an Assistant Professor in Mechatronics Engineering at Rajamangala University of Technology Rattanakosin. He holds a PhD and MS in Mechanical Engineering from the University of Illinois at Urbana-Champaign, and a BSE in Mechanical Engineering from the University of Michigan. His research focuses on the micro-manufacturing of metallic glasses, particularly in micro-forming and micro-drilling processes. This includes analyzing their thermoplastic behavior to produce high-quality surgical blades with enhanced consistency. Additionally, he develops mechatronics systems for various industrial and consumer applications across the healthcare, agriculture, and manufacturing sectors, including robots for industrial automation. He also researches innovative teaching methods and has published on topics such as collaborative learning and student engagement in engineering design courses.
Micro-Drilling Behavior in Bulk Metallic Glass and Other Glassy Materials
Bulk Metallic Glasses (BMGs) represent a novel class of amorphous materials that have been extensively explored for the fabrication of micro-scale components due to their exceptional mechanical properties. This presentation first examines the micro-drilling behavior of a Zr-based BMG, focusing on the plastic deformation mechanisms of plowing and shearing that result in distinctive chip morphologies. A chip thickness model for BMG micro-drilling is developed by considering the amorphous characteristics of BMG. Building on this analysis, a predictive model for burr formation is developed using experimental data. A comparative analysis with glassy materials governed by brittle fracture mechanics is then discussed. This comparison of two structurally similar yet mechanically distinct amorphous systems emphasizes the critical role of atomic bonding in material removal processes, highlighting the need for fundamentally different machining strategies.
Mrinal Gaurav Srivastava
Department of Materials Engineering
KU Leuven, Belgium
Mrinal Gaurav Srivastava comes from India with a background in mechanical engineering from VIT University where he developed a strong interest in biomedical applications of materials engineering. He pursued his Master’s degree in Materials Engineering with a specialization in Biomaterials at the Department of Materials Engineering, KU Leuven, Belgium. Currently, he is a PhD researcher in the same department under the supervision of Prof. Annabel Braem and Prof. Sylvie Castagne, focusing on surface modification strategies to improve peri-implant health. His research aims to enhance the performance and longevity of biomedical implants by optimizing their surface properties to promote better biological integration.
Femtosecond Laser-Textured Titanium Surfaces to Improve Peri-Implant Health
Peri-implantitis is triggered by biofilm buildup around dental implant abutments which can lead to inflammation, infection and ultimately implant failure. One major goal in implant design is to improve soft-tissue integration around the abutment to creating a protective barrier against microbial invasion. This study explores the use of femtosecond laser processing to fabricate laser-induced periodic surface structures (LIPSS) on titanium (LIPSS-Ti), investigating their impact on biological interactions, particularly protein adsorption and the response of primary human gingival fibroblasts (HGF). A comprehensive suite of surface characterization techniques—including SEM, AFM, FIB, XPS, confocal microscopy, zeta potential and contact angle measurements—was employed to analyze the modified surfaces. The resulting nanoscale textures, similar in size to cellular filopodia, exhibited elevated titanium oxide formation. LIPSS-Ti had a greater contact angle hysteresis and enhanced protein adsorption which was confirmed through in-situ measurements and streaming current analysis. Biological assessments revealed that LIPSS-Ti surfaces promoted robust HGF adhesion and proliferation, with over 80% cell viability after seven days, as shown by XTT assays and complemented by live/dead staining. SEM imaging further demonstrated cell alignment along the LIPSS orientation. Overall, the results underscore the potential of LIPSS-Ti in enhancing soft-tissue integration and provide valuable insights into the relationship between surface micro-nanostructure, chemistry and biological performance which are the critical factors for the long-term success of dental implants.
