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231225s2018 xx |||||o 00| ||eng c |
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|a 10.1021/acs.langmuir.7b03769
|2 doi
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|a pubmed24n0931.xml
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|a (DE-627)NLM279566395
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|a (NLM)29293354
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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|a Ogura, Masaru
|e verfasserin
|4 aut
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|a Identification of the Basic Sites on Nitrogen-Substituted Microporous and Mesoporous Silicate Frameworks Using CO2 as a Probe Molecule
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|c 2018
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|a ƒa Online-Ressource
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|a Date Completed 18.04.2018
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|a Date Revised 18.04.2018
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a Carbon dioxide was shown to identify surface basic properties of nitrogen-substituted microporous and mesoporous silicas, in addition to conventional basic oxides, by a detailed study using isotherm and heat of adsorption measurements as well as by infrared spectroscopy. A hydrogen-bonded weak interaction was primarily observed between CO2 and silanol (Si-OH) and silamine (Si-NH-Si) groups. The heat of adsorption of CO2 demonstrated that the latter adspecies were formed preferentially over the former, although a much higher amount of linear CO2 adspecies were found on SBA-15 mesoporous silica because of the presence of a large quantity of silanol groups on its surface. Carbamate-type chemisorbed adspecies were not detected on silamino sites, whereas carbonate-type adspecies were formed on alkali ion-exchanged zeolites and also residual sodium ions on the surface of silicalite-1. CO2 was shown to be a successful probe molecule for identifying weakly interactive hydrogen-bonding sites, and it has potential as a surface probe for strongly interactive nucleophilic sites derived from alkaline ions or a methylated silamino group, Si-N(CH3)-Si
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Fukuzawa, Shin-Ya
|e verfasserin
|4 aut
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|a Fukunaga, Seiichiro
|e verfasserin
|4 aut
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|a Yamazaki, Hiroshi
|e verfasserin
|4 aut
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|a Kondo, Junko N
|e verfasserin
|4 aut
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|a Morimoto, Masafumi
|e verfasserin
|4 aut
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|a Guillet-Nicolas, Remy
|e verfasserin
|4 aut
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|a Thommes, Matthias
|e verfasserin
|4 aut
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1992
|g 34(2018), 4 vom: 30. Jan., Seite 1376-1385
|w (DE-627)NLM098181009
|x 1520-5827
|7 nnns
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|g volume:34
|g year:2018
|g number:4
|g day:30
|g month:01
|g pages:1376-1385
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|u http://dx.doi.org/10.1021/acs.langmuir.7b03769
|3 Volltext
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