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231224s2015 xx |||||o 00| ||eng c |
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|a 10.1021/acs.langmuir.5b00833
|2 doi
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|a pubmed24n0826.xml
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|a DE-627
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|e rakwb
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|a eng
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| 100 |
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|a Ming, Yang
|e verfasserin
|4 aut
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|a Kinetic Stability of MOF-5 in Humid Environments
|b Impact of Powder Densification, Humidity Level, and Exposure Time
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|c 2015
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
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|2 rdacarrier
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|a Date Completed 17.08.2015
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|a Date Revised 05.05.2015
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a Metal-organic frameworks (MOFs) are an emerging class of microporous, crystalline materials with potential applications in the capture, storage, and separation of gases. Of the many known MOFs, MOF-5 has attracted considerable attention because of its ability to store gaseous fuels at low pressure with high densities. Nevertheless, MOF-5 and several other MOFs exhibit limited stability upon exposure to reactive species such as water. The present study quantifies the impact of humid air exposure on the properties of MOF-5 as a function of exposure time, humidity level, and morphology (i.e., powders vs pellets). Properties examined include hydrogen storage capacity, surface area, and crystallinity. Water adsorption/desorption isotherms are measured using a gravimetric technique; the first uptake exhibits a type V isotherm with a sudden increase in uptake at ∼50% relative humidity. For humidity levels below this threshold only minor degradation is observed for exposure times up to several hours, suggesting that MOF-5 is more stable than generally assumed under moderately humid conditions. In contrast, irreversible degradation occurs in a matter of minutes for exposures above the 50% threshold. Fourier transform infrared spectroscopy indicates that molecular and/or dissociated water is inserted into the skeletal framework after long exposure times. Densification into pellets can slow the degradation of MOF-5 significantly, and may present a pathway to enhance the stability of some MOFs
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|a Journal Article
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|a Purewal, Justin
|e verfasserin
|4 aut
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|a Yang, Jun
|e verfasserin
|4 aut
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|a Xu, Chunchuan
|e verfasserin
|4 aut
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|a Soltis, Rick
|e verfasserin
|4 aut
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|a Warner, James
|e verfasserin
|4 aut
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|a Veenstra, Mike
|e verfasserin
|4 aut
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|a Gaab, Manuela
|e verfasserin
|4 aut
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|a Müller, Ulrich
|e verfasserin
|4 aut
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| 700 |
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|a Siegel, Donald J
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1992
|g 31(2015), 17 vom: 05. Mai, Seite 4988-95
|w (DE-627)NLM098181009
|x 1520-5827
|7 nnns
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| 773 |
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|g volume:31
|g year:2015
|g number:17
|g day:05
|g month:05
|g pages:4988-95
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|u http://dx.doi.org/10.1021/acs.langmuir.5b00833
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