“Optimising Structure-Property Dependencies of Stochastic Materials by Probabilistic Modelling”
William Sampson, University of Manchester
ChemE’s Plant Design presentations start TODAY! ALL are welcome to attend
Plant Design is our fourth-year capstone design course where students work in teams to create a preliminary design for a chemical plant, including generating a detailed economic analysis. The course brings together everything they’ve learned throughout their undergraduate education.
Presentations are held in the Wallberg Building (WB) and the Bahen Centre (BA), both located on the St. George Campus.
Check out the schedule for details: https://tinyurl.com/capstonedesign2017
“Megasupramolecules”
Julia Kornfield, California Institute of Technology
Extreme heat is a significant health risk for a large proportion of Toronto’s population. Heat-vulnerable groups include children, older adults, people who are socially isolated or have low incomes, including those who are experiencing homelessness. Toronto Public Health estimates that extreme heat contributes to an average of 120 deaths per year in Toronto and that could increase with climate change. This presentation will highlight work that Toronto Public Health is undertaking to help address the risks of extreme heat including climate forecasting, heat vulnerability mapping, population surveillance, hot weather response and community outreach. Policy opportunities and data needs will also be discussed.
“CO2-Switchable Materials”
Philip Jessop, Queen’s University
Industrial inefficiencies, causing wastage of energy and materials, are often the result of failures to resolve time-separated conflicting requirements. For example, a drying agent particle must to strongly absorb water from something that needs to be dried, but must easily release the water when the drying agent is being regenerated. Switchable materials can solve such problems. Waste CO2 is a renewable material that can be used to reversibly trigger changes in the properties of liquids, solutes, or surfaces. This presentation will portray two different classes of switchable materials, a class of switchable solvents and a series of switchable surfaces, and discuss how their design and use can help solve practical problems (e.g.water purification, paints and coatings) while reducing environmental impact.
Prof. Cora Young
Assistant Professor
Department of Chemistry York University
Atmospheric particles with a large fraction of water soluble carbon contain organic species that absorb solar radiation. This wavelength-dependent absorption leads to a brown colour and the term brown carbon (BrC). Molecules that comprise BrC have been likened to humic substances because of the similarity between their UV/vis absorption spectra, but are otherwise poorly characterized complex mixtures. To better understand the structural characteristics of BrC, we applied techniques used for the analysis of humic substances to various real aerosol extracts likely to contain BrC. These samples were collected from biomass burning plumes of various ages (collected in Vancouver, BC and St. John’s, NL) and background air from the SOAS campaign. Using i) ultra-high resolution mass spectrometry and ii) size-exclusion chromatography coupled to UV/vis and mass spectrometry detection, we can improve our understanding of the structures that comprise BrC and their likely sources. With the first application of size-exclusion chromatography-UV/vis to BrC samples, we have unambiguously shown the prevalence of extremely low volatility organic compounds (ELVOCs) in BrC, with masses up to 10,000 Da. Within size-resolved aerosol samples, we observed that BrC and typical biomass burning markers were externally mixed. The molecular size distribution of BrC compounds was conserved between aerosol samples of different origin, including background aerosol from SOAS, suggesting most BrC is derived from biomass burning. Insights regarding molecular composition of BrC, aging, and the limitations of mass spectrometry in detection and characterization of BrC will be discussed.
“CleanTech Meets FinTech: A Data-Driven e-Ship Disruption in Environmental Engineering”
Peter Adriaens, University of Michigan
Prof. Sarah Styler
Assistant Professor
Department of Chemistry University of Alberta
Road dust is a major source of primary particulate matter in many urban centres. Since road dust contains a variety of toxic species, including heavy metals and polycyclic aromatic hydrocarbons (PAH), studies of this substrate performed to date have primarily focused on its composition and potential health effects. Although laboratory studies have shown that desert dust can act as a photocatalyst, little is currently known regarding chemistry and photochemistry at the road dust surface. Here, we report production of singlet oxygen (1O2), an important environmental oxidant, by aqueous suspensions of size-fractionated road dust collected in Edmonton, Canada. In addition, we present results from coated-wall flow tube investigations of ozone uptake by winter street sweepings. Together, these results suggest that road dust photochemistry has the potential to influence both the lifetimes of pollutants present at the dust surface and the composition of the surrounding atmosphere.
Dr. Jason Burdick
Department of Bioengineering, University of Pennsylvania
Hydrogels represent a class of biomaterials that have great promise for the repair of tissues, particularly due to our ability to engineer their biophysical and biochemical properties. Hydrogels can provide instructive signals through material properties alone (e.g., mechanics, degradation, structure) or through the delivery of therapeutics that can influence tissue morphogenesis and repair. Here, I will give examples of the design of hydrogels based on hyaluronic acid (HA) for use as injectable therapeutics or towards 3D bioprinting applications. Towards cardiac repair, my laboratory is interested in designing materials that can influence the left ventricular remodeling process that occurs after myocardial infarction. To permit percutaneous delivery of hydrogels (e.g., via catheters), we have developed a class of shear-thinning and self-assembling hydrogels that can be used for the delivery of mechanical signals, as well as cells and therapeutics (e.g., protease inhibitors). These hydrogels assemble based on guest-host interactions and can be designed to degrade via matrix metalloproteinases or to become more stable through secondary crosslinking. These iterations on material design are teaching us what important signals are needed in these hydrogels towards the next generation of translatable therapeutics for cardiac repair. Beyond injectability, these hydrogels are also useful for bioprinting in the area of additive manufacturing. Our approach involves the printing of a shear-thinning and self-healing hydrogel ink into another support hydrogel in 3D space. Shear forces disrupt the hydrogel structure for extrusion and also to receive the extruded material, with resolutions dependent on needle diameter, printing speed, and extrusion rate. This approach allows for the printing of cells, multiple inks into the support gel, and pockets of materials. Additionally, open and perfusable structures (e.g., channels) can be fabricated with secondary photocrosslinking of the support hydrogel and washing of the ink.
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Biography
Jason A. Burdick, PhD is a Professor of Bioengineering at the University of Pennsylvania. Dr. Burdick’s research involves the development of hydrogels for various biological applications and his laboratory is specifically interested in understanding and controlling polymers on a molecular level to control overall macroscopic properties. The applications of his research range from controlling stem cell differentiation through material cues to fabricating scaffolding for regenerative medicine and tissue repair. Jason currently has over 200 peer-reviewed publications and has been awarded a K22 Scholar Development and Career Transition Award through the National Institutes of Health, an Early Career Award through the Coulter Foundation, a National Science Foundation CAREER award, a Packard Fellowship in Science and Engineering, and an American Heart Association Established Investigator Award. He is on the editorial boards of Tissue Engineering, Biofabrication, and Journal of Biomedical Materials Research A, and is an Associate Editor for ACS Biomaterials Science & Engineering.
Hosted by Dr. Molly Shoichet
Snacks and Refreshments will be served
The CHE Graduate Office would like to invite all graduate students to our first “Meet & Eat”. This will consist of round table discussions, geared towards facilitating student feedback on our program and services.
Round table topics include:
- Courses
- Professional Development Opportunities
- Wellness
Sample questions:
What’s missing in the Chemical Engineering curriculum?
Does the department provided adequate professional development opportunities?
What kind of support would you like to see more of?
What kinds of things cause you the most stress?
How is your experience researching in our department?
What issues do you think the department should focus on addressing?
We look forward to seeing you all there!
Sincerely,
CHE Graduate Office Team