A5084664188- Membrane Separation and Gas Transport
- Membrane Separation Technologies
- Fuel Cells and Related Materials
- Membrane-based Ion Separation Techniques
- Synthesis and properties of polymers
- Muon and positron interactions and applications
- Polymer crystallization and properties
- Covalent Organic Framework Applications
- Advanced Battery Materials and Technologies
- Graphene research and applications
- Polymer Foaming and Composites
- Advanced Sensor and Energy Harvesting Materials
- Carbon Dioxide Capture Technologies
- Polymer Surface Interaction Studies
- Polymer Nanocomposites and Properties
- Ionic liquids properties and applications
- Silicone and Siloxane Chemistry
- Nanopore and Nanochannel Transport Studies
- Phase Equilibria and Thermodynamics
- Material Dynamics and Properties
- Dielectric materials and actuators
- Extraction and Separation Processes
- Metal-Organic Frameworks: Synthesis and Applications
- Adsorption, diffusion, and thermodynamic properties of materials
- Advanced Polymer Synthesis and Characterization
The University of Texas at Austin
2016-2025
Monash University
2021-2025
Australian Regenerative Medicine Institute
2025
Thomas Jefferson National Accelerator Facility
2023
CSIRO Manufacturing
2006-2020
Center for Environmental Health
2006-2018
Environmental and Water Resources Engineering
2017
Institute of Chemical Engineering
2005-2015
The University of Sydney
2011-2015
Koo & Associates International (United States)
2014
Gas separation properties of polymer membrane materials follow distinct tradeoff relations: more permeable polymers are generally less selective and vice versa. Robeson1 identified the best combinations permeability selectivity for important binary gas pairs (O2/N2, CO2/CH4, H2/N2, etc.) represented these permeability/selectivity empirically as αA/B = βA/B , where PA PB coefficients gases, respectively, is (=PA/PB), λA/B empirical parameters. This report provides a fundamental theory this...
The permeability of poly(dimethylsiloxane) [PDMS] to H2, O2, N2, CO2, CH4, C2H6, C3H8, CF4, C2F6, and C3F8, solubility these penetrants were determined as a function pressure at 35 °C. Permeability coefficients perfluorinated (CF4, C3F8) are approximately an order magnitude lower than those their hydrocarbon analogs (CH4, C3H8), the perfluorocarbon permeabilities significantly even permanent gas coefficients. This result is ascribed very low solubilities in hydrocarbon-based PDMS coupled...
Polymer nanocomposites continue to receive tremendous attention for application in areas such as microelectronics, organic batteries, optics, and catalysis. We have discovered that physical dispersion of nonporous, nanoscale, fumed silica particles glassy amorphous poly(4-methyl-2-pentyne) simultaneously surprisingly enhances both membrane permeability selectivity large molecules over small permanent gases. These highly unusual property enhancements, contrast results obtained conventional...
Herein we propose a new structure for poly(dopamine), synthetic eumelanin that has found broad utility as an antifouling agent. Commercially available 3-hydroxytyramine hydrochloride (dopamine HCl) was polymerized under aerobic, aqueous conditions using tris(hydroxymethyl)aminomethane (TRIS) basic polymerization initiator, affording darkly colored powder product upon isolation. The polymer analyzed variety of solid state spectroscopic and crystallographic techniques. Collectively, the data...
Within a polymer film, free-volume elements such as pores and channels typically have wide range of sizes topologies. This broad element compromises polymer's ability to perform molecular separations. We demonstrated structures in dense vitreous polymers that enable outstanding ionic transport separation performance surpasses the limits conventional polymers. The unusual microstructure these materials can be systematically tailored by thermally driven segment rearrangement. Free-volume...
Abstract Two of the greatest challenges facing 21st century involve providing sustainable supplies clean water and energy, two highly interrelated resources, at affordable costs. Membrane technology is expected to continue dominate purification technologies owing its energy efficiency. However, there a need for improved membranes that have higher flux, are more selective, less prone various types fouling, resistant chemical environment, especially chlorine, these processes. This article...
Polymer membranes are attractive for molecular-scale separations such as hydrogen purification because of inherently low energy requirements. However, membrane materials with outstanding separation performance in feed streams containing high-pressure carbon dioxide and impurities sulfide water not available. We report highly permeable, reverse-selective purification, exemplified by molecularly engineered, branched, cross-linked poly(ethylene oxide). In contrast to the conventional materials,...
Abstract This overview article discusses fundamental principles of gas sorption and transport in rubbery glassy polymers material selection guidelines for separation membranes. Comparisons between the performance membrane‐based systems more conventional technologies key commercial applications are provided. Companion articles this special edition focus on state‐of‐the‐art reviews descriptions theoretical experimental developments important technology separations using polymeric
Subnanometer metal organic framework pores can selectively transport alkali ions of the same valence and similar sizes.
The permeation properties of H2, N2, and CO2 were determined at 35 °C pressures up to 15 atm in phase-separated polyether-b-polyamide segmented block copolymers. These polymers contain poly(ethylene oxide) [PEO] or poly(tetramethylene [PTMEO] as the rubbery polyether phase nylon-6 [PA6] nylon-12 [PA12] hard polyamide phase. Extremely high values polar (or quadrupolar)/nonpolar gas selectivities, coupled with permeability coefficients, observed. CO2/H2 selectivities 9.8 CO2/N2 56 obtained...
Poly(dopamine) has emerged in recent years as a readily accessible synthetic analogue of the naturally occurring melanins. However, polymer's structure proved difficult to unambiguously elucidate and variety models have been proposed. Despite these challenges, poly(dopamine) found extraordinary utility range applications including surface coatings, biotechnology biomedicine, water purification membranes. Most take advantage robust polymer films that deposit onto wide surfaces, well its...