DC Field | Value | Language |
---|---|---|
dc.contributor.author | Patel, Hasmukh A. | ko |
dc.contributor.author | Je, Sang Hyun | ko |
dc.contributor.author | Park, Joonho | ko |
dc.contributor.author | Jung, You-Sung | ko |
dc.contributor.author | Coskun, Ali | ko |
dc.contributor.author | Yavuz, Cafer T | ko |
dc.date.accessioned | 2014-08-29T01:12:20Z | - |
dc.date.available | 2014-08-29T01:12:20Z | - |
dc.date.created | 2014-02-10 | - |
dc.date.created | 2014-02-10 | - |
dc.date.created | 2014-02-10 | - |
dc.date.issued | 2014-01 | - |
dc.identifier.citation | CHEMISTRY-A EUROPEAN JOURNAL, v.20, no.3, pp.772 - 780 | - |
dc.identifier.issn | 0947-6539 | - |
dc.identifier.uri | http://hdl.handle.net/10203/188701 | - |
dc.description.abstract | A family of azo-bridged covalent organic polymers (azo-COPs) was synthesized through a catalyst-free direct coupling of aromatic nitro and amine compounds under basic conditions. The azo-COPs formed 3D nanoporous networks and exhibited surface areas up to 729.6m(2)g(-1), with a CO2-uptake capacity as high as 2.55mmolg(-1) at 273K and 1bar. Azo-COPs showed remarkable CO2/N-2 selectivities (95.6-165.2) at 298K and 1bar. Unlike any other porous material, CO2/N-2 selectivities of azo-COPs increase with rising temperature. It was found that azo-COPs show less than expected affinity towards N-2 gas, thus making the framework N-2-phobic, in relative terms. Our theoretical simulations indicate that the origin of this unusual behavior is associated with the larger entropic loss of N-2 gas molecules upon their interaction with azo-groups. The effect of fused aromatic rings on the CO2/N-2 selectivity in azo-COPs is also demonstrated. Increasing the -surface area resulted in an increase in the CO2-philic nature of the framework, thus allowing us to reach a CO2/N-2 selectivity value of 307.7 at 323K and 1bar, which is the highest value reported to date. Hence, it is possible to combine the concepts of CO2-philicity and N-2-phobicity for efficient CO2 capture and separation. Isosteric heats of CO2 adsorption for azo-COPs range from 24.8-32.1kJmol(-1) at ambient pressure. Azo-COPs are stable up to 350 degrees C in air and boiling water for a week. A promising cis/trans isomerization of azo-COPs for switchable porosity is also demonstrated, making way for a gated CO2 uptake. | - |
dc.language | English | - |
dc.publisher | WILEY-V C H VERLAG GMBH | - |
dc.title | Directing the Structural Features of N-2-Phobic Nanoporous Covalent Organic Polymers for CO2 Capture and Separation | - |
dc.type | Article | - |
dc.identifier.wosid | 000329481800022 | - |
dc.identifier.scopusid | 2-s2.0-84892372895 | - |
dc.type.rims | ART | - |
dc.citation.volume | 20 | - |
dc.citation.issue | 3 | - |
dc.citation.beginningpage | 772 | - |
dc.citation.endingpage | 780 | - |
dc.citation.publicationname | CHEMISTRY-A EUROPEAN JOURNAL | - |
dc.identifier.doi | 10.1002/chem.201303493 | - |
dc.embargo.liftdate | 9999-12-31 | - |
dc.embargo.terms | 9999-12-31 | - |
dc.contributor.localauthor | Park, Joonho | - |
dc.contributor.localauthor | Jung, You-Sung | - |
dc.contributor.localauthor | Coskun, Ali | - |
dc.contributor.localauthor | Yavuz, Cafer T | - |
dc.description.isOpenAccess | N | - |
dc.type.journalArticle | Article | - |
dc.subject.keywordAuthor | adsorption | - |
dc.subject.keywordAuthor | carbon dioxide | - |
dc.subject.keywordAuthor | gas selectivity | - |
dc.subject.keywordAuthor | microporous materials | - |
dc.subject.keywordAuthor | polymers | - |
dc.subject.keywordPlus | CARBON-DIOXIDE CAPTURE | - |
dc.subject.keywordPlus | BENZIMIDAZOLE-LINKED POLYMERS | - |
dc.subject.keywordPlus | SCHIFF-BASE CHEMISTRY | - |
dc.subject.keywordPlus | INTRINSIC MICROPOROSITY | - |
dc.subject.keywordPlus | POROUS MATERIALS | - |
dc.subject.keywordPlus | GAS-STORAGE | - |
dc.subject.keywordPlus | HETEROGENEOUS CATALYSIS | - |
dc.subject.keywordPlus | SURFACE-AREA | - |
dc.subject.keywordPlus | FRAMEWORKS | - |
dc.subject.keywordPlus | ADSORPTION | - |
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