Dr. Dan Reddy
The Oleschuk group is thrilled to celebrate Dan Reddy, who successfully defended his PhD thesis!
Over his time in the group, Dan built a research program at the intersection of laser micromachining, surface engineering, and ambient ionization mass spectrometry. His first-author work introduced a simplified microdroplet generation device for nanoliter-volume measurement with the LMJ-SSP (Droplet, 2025) — work striking enough to earn a journal back cover — and a laser-micromachining approach to improving dried matrix spot preparation (Micromachines, 2026). He also contributed to advances in laser-induced wettability patterning (Sensors and Actuators B, 2023), laser-refined cellulose "hyper-channels" (Small Methods, 2024), and microarray-based nanoextraction for detecting drugs of abuse in wastewater (Analytical Chemistry, 2025).
We're so proud of him and can't wait to see what he will accomplish next!
Chloe and Jess win Q-ACS Excellence Awards
On May 8th, Q-ACS hosted the 2026 gala honouring the legacy of Alfred Bader and celebrating leadership in the chemical community. On this day, Chloe Graham (MSc Student) won the excellence award in diversity, equity, inclusion and respect while Jess Deng (Postdoctoral fellow) won the excellence award in leadership & empowerment.
Mina published in Analytical Chemistry
We're so excited to share that Mina has recently published some of her PhD work in analytical chemistry in an article titled Reverse Flow Engineering of a Liquid Microjunction Surface Sampling Probe for Ambient Ionization using Compuational Fluid Dynamics
Abstract:
The liquid microjunction surface sampling probe (LMJ-SSP) is a powerful ambient ionization interface for localized extraction and mass spectrometric analysis. However, the low spatial resolution (∼1.0 mm) and the potential for particle-induced clogging can limit its broader application. We integrate computational fluid dynamics (CFD) modeling with experimental measurements to systematically examine how flow direction governs liquid microjunction stability, shear stress distribution, and clogging propensity. A reverse-flow configuration where solvent is introduced through the inner fused-silica capillary and aspirated through the intercapillary annular gap was applied to overcome the limitations of the traditional design. CFD modeling revealed a pronounced reorganization of streamlines, enhanced shear forces at the liquid–surface interface, and suppressed stagnation zones, producing a more confined microjunction meniscus than the normal flow.... read more