Micro Manufacturing Colloquium - 9 June 2022

Join us at 9:15 am Central European Time (12:15 am Pacific Standard Time) on June 9, 2022 via Microsoft Teams link:

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Margherita Pizzi

Department of Mechanical Engineering

Politecnico di Milano

Margherita is a Biomedical Engineer and she is currently a PhD student at the Department of Mechanical Engineering, Politecnico di Milano. Her research topic concerns magnesium micro-machining for biomedical applications. Specifically, her project is based on the prototyping of a magnesium-based drug delivery device for ophthalmic applications.

MAGNESIUM MICRO-DRILLING FOR BIOMEDICAL APPLICATIONS: AN EXPERIMENTAL STUDY

Nowadays, magnesium (Mg) and Mg-based alloys play a very interesting role in the field of biomaterials. Due to its high biocompatibility and low toxicity, this material represents an optimal candidate for several applications, especially where an implantable device is required to perform its function for a limited period of time and a short-term integrity is necessary.

Micro-mechanical cutting methods are commonly used to obtain the final shape of magnesium-based devices, but very few studies can be found in literature regarding their application.

In this talk, a preliminary study on deep-hole micro-drilling of pure magnesium will be discussed. The aim of this work is to study the quality of high-aspect-ratio blind holes on pure Mg. The final goal is to find a suitable manufacturing setup that can be used for a novel magnesium-based intraocular drug delivery device prototyping.

Wazeem Nishad

Machine Tool Lab

Indian Institute of Technology, Bombay

Dr. Wazeem Nishad is a postdoctoral researcher at the Machine Tool Lab, Indian Institute of Technology, Bombay. He completed PhD from IIT Madras, India, in graphene-based lubrication studies and currently working on nano-machining of metallic glasses using molecular dynamics simulations. He was also a part of industrial projects in graphene manufacturing, tribology of diamond-like carbon films etc.

MACHINING INDUCED TRANSFORMATION OF GRAPHITE FLAKES TO GRAPHITE-GRAPHENE NANOPLATELETS

Graphene, the monolayer derived from graphite, promises new revolutions in electronics, solar panels, optics, energy storage, and water purification due to its properties. However, these new horizons in various fields are bottlenecked by the low yield and consequently costly synthesis techniques of graphene. Superior quality graphene has been reported using mechanical exfoliation.

This presentation presents the machining induced transformation of graphite flakes studied using experimental and molecular dynamic simulation studies. Low cutting speed oscillatory orthogonal metal cutting process was carried out completely immersed in the liquid containing graphite flakes. Exfoliated graphite-graphene nanoplatelet dispersion was produced as a by-product due to trapping of graphite flakes at tool-chip interface. Increasing the machining time decreased the quality of graphene produced by inducing structural transformation and degradation. Molecular dynamic studies performed provided better insights on the structural transformations happening in the graphite/graphene sample during machining induced mechanical exfoliation process.