Oh Lab
Tackling Global Challenges with Polymer Membranes
With the world’s population growing, the need for clean water, energy, and medicine is greater than ever. At the Oh Lab, we are dedicated to advancing the world’s most important, but challenging, separations in the environment, energy, and health sector. We do this by focusing on the molecular-to-macroscopic design and characterization of polymer membranes.
Featured Project
Weak polyelectrolyte membranes with a wide ion-exchange capacity (IEC) range and limited water swelling in clean technologies for sustainability
We have designed a systematic library of weak polyelectrolyte membranes: crosslinked acrylic acid –poly(ethylene glycol) diacrylate (AA-PEGDA) networks, with a wide range of ion-exchange capacity (IEC = 0 ~ 4 meq/g) and limited water swelling (0.07 – 0.69). This system offers an opportunity to investigate water and ion transport using the same chemical structure, for the first time.
2024
20. Detergent / surfactant retention during ultrafiltration in the formulation of biotherapeutics
Liang-Kai Chu, Zhuoshi Du, Matthew Billups, Hee Jeung Oh, Andrew Zydney*
Biotechnology Progress, 2025; 41(3):e70011. doi:10.1002/btpr.70011
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19. Determination of carboxyl dissociation degree and pKa in weak polyelectrolyte membranes via POT titration and FTIR analysis for clean technologies in sustainability
Yongha Kim, Taekwon Kim‡, Dae Eun Kang‡, Jack S. Szymanski‡, Riley B. Kracaw‡, Andrew J. Lukaszewski‡, Kyle M. Tierney‡, Michael A. Shaqfeh‡, Charleen M. Rahman‡, and Hee Jeung Oh*, Macromolecules, 2024, 57, 22, 10844–10860, DOI: 10.1021/acs.macromol.4c02139
To systematically quantify the dissociated charged group content in charged polymers, we reported the degree of ionization (α) and negative logarithm of acid dissociation constant (pKa) of AA-PEGDA series at varied external pH via conventional potentiometric titration (POT titration) and widely available ATR-FTIR analysis.
Published
Hydrocarbon Deposition during Polyolefin Upcycling: Irreversible Adsorption and Surface Reactions of Polyethylene and Ethylene Oligomers on Silica Supports. F Motolani, RJ Snellings, S Aghamohammadi, HJ Oh… Industrial & Engineering Chemistry Research, 2025
Hydrocarbon Deposition during Polyolefin Upcycling: Irreversible Adsorption and Surface Reactions of Polyethylene and Ethylene Oligomers on Silica Supports. F Motolani, RJ Snellings, S Aghamohammadi, HJ Oh… Industrial & Engineering Chemistry Research, 2025
Hydrocarbon Deposition during Polyolefin Upcycling: Irreversible Adsorption and Surface Reactions of Polyethylene and Ethylene Oligomers on Silica Supports. F Motolani, RJ Snellings, S Aghamohammadi, HJ Oh… Industrial & Engineering Chemistry Research, 2025
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