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13. AIChE Virtual Communities of Practice-Supporting Faculty during the COVID-19 Pandemic

Author

Liberatore, Matthew W., Lepek, Daniel, Ford, Laura P., Carter, Tracy, Pascal, Jennifer, Lamm, Monica, Luks, Christi Patton, Silverstein, David L., Ford Versypt, Ashlee N., Velegol, Stephanie Butler, Vogel, Troy, Raikar, Neha, Kipper, Matt J., and West, Christy Wheeler

Abstract

In response to the COVID-19 pandemic, chemical engineering departments from around the world shifted their course offerings from in-person to online almost instantaneously. The AIChE Education Division immediately responded to this educational shift by developing five Virtual Communities of Practice (VCPs) that allowed faculty to share experiences and best practices as well as provide a network for emotional support. Community creation, methods and materials shared, and surveys related to the impact of this initiative will be discussed.

Published
2022
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16. Anomalous protein kinetics on low-fouling surfaces

Author

Hedayati, Mohammadhasan, Kipper, Matt J., and Krapf, Diego

Subjects
Physics - Chemical Physics, Condensed Matter - Statistical Mechanics
Abstract

In this work, protein-surface interactions were probed in terms of adsorption and desorption of a model protein, bovine serum albumin, on a low-fouling surface with single-molecule localization microscopy. Single-molecule experiments enable precise determination of both adsorption and desorption rates. Strikingly the experimental data show anomalous desorption kinetics, evident as a surface dwell time that exhibits a power-law distribution, i.e. a heavy-tailed rather than the expected exponential distribution. As a direct consequence of this heavy-tailed distribution, the average desorption rate depends upon the time scale of the experiment and the protein surface concentration does not reach equilibrium. Further analysis reveals that the observed anomalous desorption emerges due to the reversible formation of a small fraction of soluble protein multimers (small oligomers), such that each one desorbs from the surface with a different rate. The overall kinetics can be described by a series of elementary reactions, yielding simple scaling relations that predict experimental observations. This work reveals a mechanistic origin for anomalous desorption kinetics that can be employed to interpret observations where low-protein fouling surfaces eventually foul when in long-term contact with protein solutions. The work also provides new insights that can be used to define design principles for non-fouling surfaces and to predict their performance.

Published
2019
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28. A smart microporous block copolymer membrane containing fluorescent europium complexes reports drug release through fluorescence changes.

Author

Rui Xu, Jingjing Wang, Zengkun Li, Boying Wang, Wenfei Shen, Yao Wang, Wei Wang, Yanxin Wang, Jun Li, Snow, Christopher D., Kipper, Matt J., Belfiorea, Laurence A., and Jianguo Tang

Abstract

If wound dressings can be pre-medicated and can actively sense in situ drugs, this technology will enable real-time monitoring of the effectiveness of wound dressings. In this work, a novel microporous fluorescence membrane (MPFM) was synthesized using Eu3+-induced diblock poly(styrene-co-acrylate acid) 2D nano-aggregates (EIP2As) with sensitive in situ drug release tracing properties. This membrane was synthesized by interfacial aggregation of an amphiphilic block copolymer polystyrene-block-polyacrylic acid at the gas-liquid interface, induced by doped Eu3+-complexes. The hybrid membrane has a uniform porous structure, making it a good drug carrier. Simultaneously with the delayed release of the drug, added piperine can quench the fluorescence of doped Eu3+-complexes, resulting in a monitorable fluorescence increase during drug release. The fluorescent Eu3+-complex and the drug are co-localized, enabling the visualization of the drug content in the membrane by translating the drug content into the fluorescence intensity of the microporous membrane. Compared with existing dressing materials, the MPFM has a unique ability to visualize the drug content, which brings great convenience to users, significantly increases the utilization efficiency of wound dressings, and greatly reduces the waste of medical materials. This novel membrane has the potential to be applied as a key layer material for wound dressings, as it can sense the drug loading content and trace drug release progress. [ABSTRACT FROM AUTHOR]

Published
2024
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40. Excellent Electroluminescent Property of Eu3+-Induced Polystyrene-co-poly(acrylic acid) Aggregates (EIPAs) in Polymeric Light-Emitting Diodes

Author

Qi, Rui, Shen, Wenfei, Xu, Rui, Li, Zengkun, Long, Zaixin, Wang, Yao, Tang, Qinglin, Kipper, Matt J., Popat, Ketul, Belfiore, Laurence A., and Tang, Jianguo

Abstract

Eu3+-induced polystyrene-co-poly(acrylic acid) aggregates (EIPAs) were synthesized using a self-assembly approach, and their structures and photophysical characteristics were examined to achieve effective monochromatic red emission in polymer light-emitting diodes (PLEDs). By adjusting the monomer ratio in RAFT polymerization, the size of Eu3+-induced block copolymer nanoaggregates can be regulated, thereby modulating the luminescence intensity. High-performance bilayer polymer light-emitting devices were fabricated using poly(9,9-dioctylfluorene) (PFO) and 2-(tert-butylphenyl)-5-biphenylyl-1,3,4-oxadiazole (PBD) as the host matrix, with EIPAs as the guest dopant. The devices exhibited narrow red emission at 615 nm with a full width at half-maximum (fwhm) of 15 nm across doping concentrations of 1, 3, 5, and 10 wt %. At a doping concentration of 3 wt %, the device achieved a maximum brightness of 1864.48 cd/m2at 193.82 mA/cm2and an external quantum efficiency of 3.20% at a current density of 3.5 mA/cm2. These results indicate that incorporating polystyrene-co-poly(acrylic acid) with Eu3+complexes enhances the excitation and emission intensity, as well as the structural stability of the emitting layer in PLEDs, thereby improving the device performance.

Published
2024
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