Browsing NTNU Open by Author "Spontak, Richard J"
Now showing items 1-9 of 9
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Carbon molecular-sieve membranes developed from a Tröger's base polymer and possessing superior gas-separation performance
Dai, Zhongde; Guo, Hongfang; Deng, Jing; Deng, Liyuan; Yan, Jiaqi; Spontak, Richard J (Journal article; Peer reviewed, 2023)Carbon molecular-sieve membranes possess tremendous practical advantages over unary polymer membranes by providing high gas-separation performance levels, coupled with excellent mechanical and chemical stability. Improving ... -
Facile and Solvent-free Fabrication of PEG-based Membranes with Interpenetrating Networks for CO2 Separation
Deng, Jing; Dai, Zhongde; Yan, Jiaqi; Sandru, Marius; Sandru, Eugenia; Spontak, Richard J; Deng, Liyuan (Journal article; Peer reviewed, 2018)For nearly two decades, membranes derived from polyethers have served as promising candidate materials for CO2 separation. Due to the inherent tendency of high-molecular-weight poly(ethylene oxide) (PEO) to crystallize and ... -
High-performance carbon-capture membranes developed by (non)solvent-induced nanostructural rearrangement in Nafion
Wei, Jing; Deng, Jing; Ma, Yulei; Qin, Zikang; Wang, Bangda; Deng, Liyuan; Spontak, Richard J; Dai, Zhongde (Peer reviewed; Journal article, 2023)Membrane materials exhibiting high CO2 permeability and selectivity are needed for CO2 capture to mitigate global climate change. In this study, Nafion is dissolved in and cast from N-methylpyrrolidone to generate membranes ... -
Highly CO2-permeable membranes derived from a midblock-sulfonated multiblock polymer after submersion in water
Dai, Zhongde; Deng, Jing; Aboukeila, Hesham; yuan, jiaqi; Ansaloni, Luca; Mineart, Kenneth P.; Baschetti, Marco Giacinti; Spontak, Richard J; Deng, Liyuan (Journal article; Peer reviewed, 2019)To mitigate the effect of atmospheric CO2 on global climate change, gas separation materials that simultaneously exhibit high CO2 permeability and selectivity in gas mixtures must be developed. In this study, CO2 transport ... -
Humidity-responsive Molecular Gate-opening mechanism for Gas Separation in Ultraselective Nanocellulose/IL Hybrid Membranes
Janakiram, Saravanan; Ansaloni, Luca; Jin, Soo-Ah; Yu, Xinyi; Dai, Zhongde; Spontak, Richard J; Deng, Liyuan (Peer reviewed; Journal article, 2020)Nanofibrillated cellulose (NFC) represents an important class of bio-based nanomaterials that possess favorable properties including hydrophilicity, 1D structure, biodegradability, and surface tunability. Although widely ... -
Incorporation of an ionic liquid into a midblock-sulfonated multiblock polymer for CO2 capture
Dai, Zhongde; Ansaloni, Luca; Ryan, Justin J.; Spontak, Richard J; Deng, Liyuan (Journal article; Peer reviewed, 2019)In the present work, hybrid block ionomer/ionic liquid (IL) membranes containing up to 40 wt% IL are prepared by incorporating 1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim][BF4]) into a midblock-sulfonated pentablock ... -
An integrated materials approach to ultrapermeable and ultraselective CO2 polymer membranes
Sandru, Marius; Sandru, Eugenia-Mariana; Ingram, Wade F.; Deng, Jing; Stenstad, Per Martin; Deng, Liyuan; Spontak, Richard J (Peer reviewed; Journal article, 2022)A challenge in the design of polymeric membranes for gas separation is the tradeoff between permeability, or how fast gases can flow through the membrane, and selectivity, the ability to separate one gas from another. In ... -
Nafion/IL hybrid membranes with tuned nanostructure for enhanced CO2 separation: effects of ionic liquid and water vapor
Dai, Zhongde; Ansaloni, Luca; Ryan, Justin J.; Spontak, Richard J; Deng, Liyuan (Journal article; Peer reviewed, 2018)Polyelectrolytes have been reported to display gas permeation properties that can be of significant interest for CO2 capture applications, especially when they are fully hydrated. In this work, hybrid membranes prepared ... -
Preparation of cellulose nanofibrils for imaging purposes: comparison of liquid cryogens for rapid vitrification
Torstensen, Jonathan Ø; Johnsen, Per-Olav; Riis, Henrik; Spontak, Richard J; Deng, Liyuan; Gregersen, Øyvind Weiby; Syverud, Kristin (Journal article; Peer reviewed, 2018)Artifact-free imaging of cellulose nanofibrils (CNFs) from aqueous nanocellulose suspensions is nontrivial due to frequent irreversible agglomeration and structure damage during the course of sample preparation, especially ...