Date: Thursday, March 21, 2019
Time: 12:00 p.m.
Title: Dynamic Microtopography Arrays for Adhesion and Friction Control
Presenter: Kurtis Laqua (MASc Candidate)
Supervisor: Professor B. Hatton
Abstract: The microstructures of natural surfaces, such as plant leaves, reptile skin and ciliated tissues can be actuated to provide dynamic, adaptive properties of wetting, transport, and adhesion . Examples include the gecko and the octopus, which can reversibly switch their adhesion to a wide variety of opposing surfaces. Yet, most synthetic surface structures (and adhesion strength) are static, lacking an ability to change dynamically in response to their environment or an applied signal. This work explores how adhesion and friction can be controlled through bio-inspired dynamic surfaces. By engineering the shape, scale, and spacing of surface microtopography on silicone layers, interfacial contact and interaction can be modified. Our adhesive devices can show switchable adhesion to structured or flat surfaces and tunable friction capable of >50% change in peak frictional force.  Gorb S. Functional surfaces in biology: mechanisms and applications. CRC Press; 2006. p. 381-97.
Title: Nitrogen Doping on Activated Carbon for Supercapacitor Electrodes
Presenter: Raunaq Bagchi (MASc Candidate)
Supervisor: Professor K. Lian
Abstract: Electric double layer capacitors (EDLCs) are energy storage devices with high power density. Energy is stored in these systems through electrostatic interactions and the electrode material is commonly activated carbon (AC). However, the energy density of EDLCs still lags behind that of batteries. Another type of charge storage, known as pseudocapacitance, utilises fast surface electrochemical reactions. These reactions can be introduced in EDLCs to improve its energy density. This research aims to introduce fast surface chemical reactions to biomass-derived activated carbon electrodes. Nitrogen doping has emerged as a promising route to introduce surface functionality and redox reaction sites to activated carbon. Pyridinic and pyrrolic nitrogen groups on graphitic sheets have been widely reported to contribute towards capacitance while graphitic nitrogen contributes towards electrical conductivity. In this investigation, a commercial coconut-derived YP-50F AC and a lab-synthesized chitosan-based AC served as the candidate baseline materials. A doping process was optimized using melamine as the nitrogen source and the doped ACs were then characterized. Cyclic voltammetry was used to evaluate the electrochemical performance and capacitive properties of the doped ACs. Successfully doped samples were characterized using scanning electron microscopy (SEM) to understand surface morphology and pore structure followed by BET nitrogen adsorption isotherms to approximate surface area. Raman spectroscopy was used to track graphitization changes and X-ray photoelectron spectroscopy (XPS) provided the information of surface functionality to confirm the presence of pyridinic and pyrrolic groups. A small percentage of nitrogen (<10%) on the surface led to improvements of ca. 20% and 10% in the capacitance of the doped YP-50F and chitosan AC materials.
Speaker: Mathias Kolle
Affiliation: Associate Professor, Mechanical Engineering, Massachusetts Institute of Technology (MIT)
Date and time: Monday, March 25, 2019, 1 – 2 PM
Location: Bahen Centre, 40 St George St, Room 1130
Short Bio: Mathias Kolle is an Associate Professor in Mechanical Engineering at the Massachusetts Institute of Technology (MIT), Boston. His research is focused on the study of biological photonic systems and the development of bio-inspired, adaptive and actively tunable micro-optical materials and devices. His current projects include biologically-inspired tunable optical materials, scalable manufacture of optical materials, and the morphogenesis of biological photonic structures. In his PhD (2010) Mathias studied biological and bio-inspired optical systems in the research group of Uli Steiner at the University of Cambridge, UK.
In this one-hour interactive workshop, you will develop the skills associated with improving your exam performance. With the help of the Faculty’s learning strategist and health and wellness counsellor, you will develop preparation strategies and learn study techniques and ways to manage anxiety as you enter exam season.
Lunch will be provided!
Engineering graduate students are invited to gain an insider’s perspective from alumni working in the fields of Sustainability. Learn how to stand out in a competitive marketplace, and what competencies you can develop now to position yourself for future career opportunities in these emerging fields.
Thursday, March 28, 2019
5:45 – 7:45pm
Learn more here
Graduate Engineering Career Fair is your opportunity to meet employers who are recruiting current MASc, MHSc, PhD, MEng and MEngCEM students, and alumni to fill a wide range of roles, including:
WHEN: Tuesday, May 7, 2019; 10 am to 3 pm
WHERE: Exam Centre, 255 McCaul St, Toronto, ON M5T 1W7
More information here.