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Comprehensive Structural Characterization of Charged Polymers Involved in Moisture-Driven Direct Air Capture
Gayathri Yogaganeshan, Rui Zhang, Raimund Fromme, Sharang Sharang, Jamie Ford, Douglas M Yates, Marlene Velazco Medel, Martin Uher, Justin Flory, Jennifer Wade, Petra Fromme
https://arxiv.org/abs/2508.11809

Comprehensive Structural Characterization of Charged Polymers Involved in Moisture-Driven Direct Air Capture
The rise in atmospheric carbon dioxide (CO2) levels has led to urgent calls for effective carbon capture methods, with direct air capture (DAC) emerging as a promising solution. This study focuses on the structural characterization of commercially available alkaline anion-exchange membrane (AEM) polymers, Fumasep FAA-3 and IRA 900, for use in low-energy, moisture-driven DAC applications. A combination of X-ray diffraction, small and wide-angle X-ray scattering (SAXS/WAXS), atomic force microsco…

Moisture-driven CO2 direct air capture and delivery for cultivating cyanobacteria
Justin Flory, Shuqin Li, Samantha Taylor, Sunil Tiwari, Garrett Cole, Marlene Velazco Medel, Amory Lowe, Jordan Monroe, Sara Sarbaz, Nick Lowery, Joel Eliston, Heidi P. Feigenbaum, Heather Emady, Jason C. Quinn, Matthew Green, John McGowen, Klaus Lackner, Wim Vermaas
https://

Moisture-driven CO2 direct air capture and delivery for cultivating cyanobacteria
A moisture-driven air capture system was developed and demonstrated for cultivating cyanobacteria and microalgae at the flask (50 mL), bench (12 L) and small pilot (840 L) scale. Purolite A501 anion exchange resin beads were found to be biocompatible and rapidly deliver air-captured CO2 when immersed directly in an alkaline cultivation medium containing cyanobacteria or microalgae. Flask-scale cultivation trials showed A501 could sustain rapid growth (190 mg/L/d) of the cyanobacterium Synechocy…

The Open DAC 2025 Dataset for Sorbent Discovery in Direct Air Capture
Anuroop Sriram, Logan M. Brabson, Xiaohan Yu, Sihoon Choi, Kareem Abdelmaqsoud, Elias Moubarak, Pim de Haan, Sindy L\"owe, Johann Brehmer, John R. Kitchin, Max Welling, C. Lawrence Zitnick, Zachary Ulissi, Andrew J. Medford, David S. Sholl
https://arxiv.org/abs/2508…

The Open DAC 2025 Dataset for Sorbent Discovery in Direct Air Capture
Identifying useful sorbent materials for direct air capture (DAC) from humid air remains a challenge. We present the Open DAC 2025 (ODAC25) dataset, a significant expansion and improvement upon ODAC23 (Sriram et al., ACS Central Science, 10 (2024) 923), comprising nearly 70 million DFT single-point calculations for CO$_2$, H$_2$O, N$_2$, and O$_2$ adsorption in 15,000 MOFs. ODAC25 introduces chemical and configurational diversity through functionalized MOFs, high-energy GCMC-derived placements,…

Design and demonstration of a direct air capture system with moisture-driven CO2 delivery into aqueous medium
Justin Flory, Samantha Taylor, Shuqin Li, Sunil Tiwari, Garrett Cole, Amory Lowe, Lindsey Hamblin, Samuel Piorkowski, Matthew Ryan, Thiago Stangherlin Barbosa, Jason Kmon, Nick Lowery, Joel Eliston, Jason C. Quinn, John McGowen, Matthew D. Green, Klaus Lackner, Wim Vermaas

Design and demonstration of a direct air capture system with moisture-driven CO2 delivery into aqueous medium
A moisture-driven air capture (DAC) system was designed and demonstrated. A laboratory-scale system delivering ~1 g CO2 per day was demonstrated in a laminar flow hood and a small pilot-scale system that could deliver ~100 g CO2 daily was operated outdoors in a 4.2 m2 (areal surface area) raceway pond. Elongated mesh tube packets were designed to contain AER beads with high surface area for contacting the air and were found to reduce drying and CO2 loading time ~4-fold over larger mesh bags. Wh…

H$_2$O and CO$_2$ sorption in ion exchange sorbents: distinct interactions in amine versus quaternary ammonium materials
Golnaz Najaf Tomaraei, Sierra Binney, Ryan Stratton, Houlong Zhuang, Jennifer L. Wade
https://arxiv.org/abs/2508.03909

H$_2$O and CO$_2$ sorption in ion exchange sorbents: distinct interactions in amine versus quaternary ammonium materials
This study investigates the H$_2$O and CO$_2$ sorption behavior of two ion exchange sorbents: a primary amine and a permanently charged strong base quaternary ammonium (QA) groups with (bi)carbonate counter-anions. We compare their distinct interactions with H$_2$O and CO$_2$ through simultaneous thermal gravimetric, calorimetric, gas analysis and molecular modeling to evaluate their performance for dilute CO$_2$ separations like direct air capture. Thermal and hybrid (heat + low-temperature …

Characterizing and modeling the mechanical behavior of an anion exchange membrane for carbon capture applications
Sara Sarbaz, Zhi Xin Liu, Heidi Feigenbaum, Samaneh Bayati, Winston Wang, Jennifer Wade, Husain Mithaiwala, Matthew D. Green
https://arxiv.org/abs/2508.01910

Characterizing and modeling the mechanical behavior of an anion exchange membrane for carbon capture applications
A new direct air capture (DAC) technology uses a moisture swing (MS) process with anion exchange membranes, potentially offering a more energy-efficient way to remove CO2 from the air. In this MS process, the membrane absorbs CO2 as it dries and releases it when water is added. Understanding the mechanical behavior of these membranes is essential for improving the design and efficiency of DAC systems and prolonging sorbent lifetime. This study tested one anion exchange membrane, Fumasep FAA-3, …