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RISS 인기검색어
- 검색키워드
- 저자 : Aaron W. Thornton (검색결과 4 건)
- 무료
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- 유료
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Materials Genome in Action: Identifying the Performance Limits of Physical Hydrogen Storage
Thornton, Aaron W.,Simon, Cory M.,Kim, Jihan,Kwon, Ohmin,Deeg, Kathryn S.,Konstas, Kristina,Pas, Steven J.,Hill, Matthew R.,Winkler, David A.,Haranczyk, Maciej,Smit, Berend American Chemical Society 2017 Chemistry of materials Vol.29 No.7
<P/><P>The Materials Genome is in action: the molecular codes for millions of materials have been sequenced, predictive models have been developed, and now the challenge of hydrogen storage is targeted. Renewably generated hydrogen is an attractive transportation fuel with zero carbon emissions, but its storage remains a significant challenge. Nanoporous adsorbents have shown promising physical adsorption of hydrogen approaching targeted capacities, but the scope of studies has remained limited. Here the Nanoporous Materials Genome, containing over 850 000 materials, is analyzed with a variety of computational tools to explore the limits of hydrogen storage. Optimal features that maximize net capacity at room temperature include pore sizes of around 6 Å and void fractions of 0.1, while at cryogenic temperatures pore sizes of 10 Å and void fractions of 0.5 are optimal. Our top candidates are found to be commercially attractive as “cryo-adsorbents”, with promising storage capacities at 77 K and 100 bar with 30% enhancement to 40 g/L, a promising alternative to liquefaction at 20 K and compression at 700 bar.</P>
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Predicting particle transport through an aging polymer using vacancy diffusion
Aaron W. Thornton,Anita J. Hill,Kate M. Nairn,James M. Hill 한국물리학회 2008 Current Applied Physics Vol.8 No.3,4
Understanding the process of particle transport is important for various applications such as separation, storage and blockage ofselected particles within a polymer. The diusivity of particles has been related to the fractional free volumefwithin a sample by theexpressionD(f)=A exp(. B/f A and B.Polymers are known to undergo physical aging such that the free volumedistribution changes over time towards an equilibrium. This phenomenon has been well explained by the vacancy diusion model estab-lished by Curro et al. [J.G. Curro, R.R. Lagasse, R. Simha, Macromolecules 15 (1982) 1621]. Using both the diusion expression and thevacancy diusion model, this paper models particle transport in aging, unaged and aged polymer samples.
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Architecturing Nanospace via Thermal Rearrangement for Highly Efficient Gas Separations
Thornton, Aaron W.,Doherty, Cara M.,Falcaro, Paolo,Buso, Dario,Amenitsch, Heinz,Han, Sang Hoon,Lee, Young Moo,Hill, Anita J. American Chemical Society 2013 JOURNAL OF PHYSICAL CHEMISTRY C - Vol.117 No.46
<P>The ability to monitor free volume formation during space-making treatments is critical for the ultrafine tuning of nanospace for efficient gas separation. Here, investigating the polymer thermal rearrangement using synchrotron in situ small-angle X-ray scattering for the first time and combining this information with transport theory, we elucidate the evolution of nanospace features in polymer-based gas separation membranes. The proposed nanospace monitoring technique encompasses the structure–property relationships, therefore offering a powerful tool for tuning the polymer properties for particular gas-related clean energy applications. These results demonstrate that the fine control of the nanospace dimension and magnitude leads to a drastic improvement in gas separation performance above any material to date.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2013/jpccck.2013.117.issue-46/jp410025b/production/images/medium/jp-2013-10025b_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp410025b'>ACS Electronic Supporting Info</A></P>
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Nanocrack-regulated self-humidifying membranes
Park, Chi Hoon,Lee, So Young,Hwang, Doo Sung,Shin, Dong Won,Cho, Doo Hee,Lee, Kang Hyuck,Kim, Tae-Woo,Kim, Tae-Wuk,Lee, Mokwon,Kim, Deok-Soo,Doherty, Cara M.,Thornton, Aaron W.,Hill, Anita J.,Guiver, Nature Publishing Group, a division of Macmillan P 2016 Nature Vol.532 No.7600
<P>The regulation of water content in polymeric membranes is important in a number of applications, such as reverse electrodialysis and proton-exchange fuel-cell membranes. External thermal and water management systems add both mass and size to systems, and so intrinsic mechanisms of retaining water and maintaining ionic transport(1-3) in such membranes are particularly important for applications where small system size is important. For example, in proton-exchange membrane fuel cells, where water retention in the membrane is crucial for efficient transport of hydrated ions(1,4-7), by operating the cells at higher temperatures without external humidification, the membrane is self-humidified with water generated by electrochemical reactions(5,8). Here we report an alternative solution that does not rely on external regulation of water supply or high temperatures. Water content in hydrocarbon polymer membranes is regulated through nanometre-scale cracks ('nanocracks') in a hydrophobic surface coating. These cracks work as nanoscale valves to retard water desorption and to maintain ion conductivity in the membrane on dehumidification. Hydrocarbon fuel-cell membranes with surface nanocrack coatings operated at intermediate temperatures show improved electrochemical performance, and coated reverse-electrodialysis membranes show enhanced ionic selectivity with low bulk resistance.</P>
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