Seminar

Abstract: Dehumidification accounts for a substantial fraction of energy use and associated emissions in air‑conditioning systems, representing roughly 53% of energy‑related air conditioning emissions on a global average. Vapor-selective membranes, which preferentially transport water molecules while blocking the transport of other gases, have emerged as a promising alternative technology for the heating, ventilation, and air conditioning (HVAC) industry, even being ranked as a top alternative technology by the US Department of Energy. Over the past 20 years, the field has seen a significant amount of research interest in the development of high-performance membrane materials and synthesis procedures. However, translation of these materials advances into practical HVAC systems has largely relied on idealized thermodynamic system models, with a notable lack in experimental demonstration. As a result, a disconnect persists between membrane material development, component-level limitations, and realistic system and process design. This seminar presents our ongoing work aimed at bridging this gap by explicitly linking real membrane properties to component sizing, operating constraints, and system‑level efficiency. The broader goal of this research is to establish a holistic framework that integrates materials, components, and system design to clarify tradeoffs, define benchmark performance targets, and guide future research and development towards the broader adoption of high-efficiency, membrane-based HVAC technologies.

Denitrification is a vital microbial process within the nitrogen cycle, where nitrate (NO3⁻) is reduced to nitrogen gas (N2), thereby alleviating nitrogen pollution in aquatic environments. Traditionally, organic carbon sources have been recognized as the primary electron donors for denitrification. However, recent research has underscored the significance of sulfur compounds as alternative electron donors, especially in settings where organic carbon is scarce. The current paradigm acknowledges the coexistence of heterotrophic and autotrophic denitrifiers in completing the denitrification pathway.
Facultative sulfur-driven denitrification represents an innovative biological process that integrates sulfide oxidation with denitrification, providing a dual solution for wastewater treatment. This process leverages specific heterotrophic bacteria capable of oxidizing sulfide while concurrently reducing nitrates, effectively eliminating both sulfide and nitrogen compounds from wastewater. The facultative nature of these bacteria enables them to adapt to fluctuating oxygen levels, thereby enhancing the process's flexibility and efficiency. This presentation will delve into recent advancements in facultative sulfur-driven denitrification, with a focus on its application in engineered systems such as wastewater treatment plants and bioreactors. By exploring the mechanisms and benefits of this process, we aim to highlight its potential for improving wastewater management and contributing to sustainable environmental practices.

The Chemical Engineering Department is hosting a special graduate lecture on Optimization and simulation-based approaches to manage logistics of trucks and ships in large supply chains.

The Chemical Engineering Department is hosting a special graduate lecture on Optimizing Experiments: From Data-Driven to Intrusive Model-Based Methods. 

Bioinks for bioprinting and injectable biomaterials share a common thread in fluid mechanics (rheology) in that the flow properties of the material are crucial to successful application. Beyond shear-thinning behavior, properties including yield stress and storage modulus recovery are important, and speak to the ‘paste-like’ quality of the material. Two applications in regenerative medicine will be highlighted: traumatic brain injury and cartilage injury.

In severe traumatic brain injuries, often a portion of the skull is surgically removed to relieve pressure from the brain swelling, but a 2nd surgery is required to fill that gap in the skull. We have proposed a paste-like biomaterial that could potentially eliminate the 2nd surgery.

Our goal is to implant the biomaterial at the time of the original surgery,to be crosslinked to stay in place, flexible to allow the brain to swell, deliver anti-inflammatory drugs locally to the brain, and then transition into bone over time. Initial studies with bone regeneration and drug delivery have shown promise.

Abstract :

Humanity faces multiple converging crises such as pandemics, climate change, ecosystem degradation, and environmental pressures from rising global prosperity. We urgently need transformative solutions. At the same time, the past three decades have also witnessed sterling advances in genomics, synthetic biology, and computation, which have re-cast living systems as programmable platforms for innovation. Biology has now matured into a form of infrastructure - an enabling layer upon which solutions to health, the energy transition, material de-fossilization and the circular economy can be built.

Just as physical infrastructure underpinned the industrial age and digital infrastructure drives the current information age, biological infrastructure now offers the foundation for a sustainable one. Engineered biological systems can facilitate a more rapid response to emerging threats, enable sustainable resource recovery, as well as upcycle waste into high-value products. In this sense, biology is no longer confined to the laboratory; it is becoming the scaffolding of a new industrial paradigm where living and designed systems work in concert to sustain civilization.

The Chemical Engineering Department is hosting a special graduate lecture on Polymeric Applications of Waste Mussel Shell. 

The Chemical Engineering Department is hosting a special graduate seminar on Materials and interfaces for the next generation batteries.

The Chemical Engineering Department is hosting a special graduate seminar on Environmental Sustainability Challenges in Canadian Healthcare.

Photopolymerization reactions have been explored and utilized since the time of the ancient Egyptians; however, development of new photopolymerization methodologies and applications continues at an ever more rapid pace.  Traditionally, photopolymerization of multifunctional monomers results in highly crosslinked materials suitable for applications as optical lenses, optical fiber coatings, and dental materials.  These reactions are ubiquitous not only because of the nature of the final polymer product, but also for the characteristics of the reaction itself.  Photopolymerizations are far more energy efficient than their thermal counterparts, are typically performed in a solventless manner that is more environmentally compatible, the reactions occur rapidly at ambient conditions, and the polymerization can be controlled in both time and space.