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231223s2009 xx |||||o 00| ||eng c |
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|a 10.1021/la901334z
|2 doi
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|a pubmed24n0639.xml
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|a (DE-627)NLM191678031
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|a (NLM)19788277
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|a DE-627
|b ger
|c DE-627
|e rakwb
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| 041 |
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|a eng
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| 100 |
1 |
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|a Borghard, W G
|e verfasserin
|4 aut
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|a Characterization and testing of periodic mesoporous organosilicas as potential selective benzene adsorbents
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|c 2009
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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
|b cr
|2 rdacarrier
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|a Date Completed 28.12.2009
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|a Date Revised 27.10.2009
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|a published: Print
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|a Citation Status PubMed-not-MEDLINE
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|a The effects of surface imprinting on the adsorption and desorption properties of benzene- and diethylbenzene-bridged periodic mesoporous organosilicas (PMOs) acting as GC stationary-phase preconcentration sorbents for benzene and xylene were examined. Surface-imprinted and nonimprinted PMOs with diethylbenzene (DEB), benzene (BENZ), and ethane (BTSE) bridges and nonimprinted mesoporous silica (MCM-41) were prepared via well-established surfactant templating synthetic methods. The imprinted materials were synthesized using a surfactant demonstrated to produce trinitrotoluene (TNT) selective sorbents with increased adsorption capacity for cresol and 4-nitrophenol as well as TNT. Powder XRD and nitrogen sorption measurements revealed that all of the materials were mesoporous with the DEB materials having a random pore structure and lower surface area than the other materials which had ordered pore structures. Results for maximum uptake of benzene and p-xylene indicate a small but consistent positive effect on the adsorption of benzene and p-xylene due to surface imprinting. Comparing the surface area normalized uptakes (mg/m(2)) for materials having the same organic bridge with and without imprinting (DEB vs TDMI-DEB and BENZ vs TDMI-BENZ) shows that in seven of eight comparisons the imprinted analogue had a higher aromatic uptake. The imprinted samples showed higher weight normalized uptakes (mg/g) in five of eight cases. When used as a GC stationary phase, the organosilica materials yield more symmetrical chromatographic peaks and better separation than MCM-41, indicating superior trapping of BTX analytes, particularly at low concentrations. Additionally, these materials rapidly desorb the preconcentrated compounds
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|a Journal Article
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|a Calabro, D C
|e verfasserin
|4 aut
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|a DiSanzo, F P
|e verfasserin
|4 aut
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|a Disko, M M
|e verfasserin
|4 aut
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|a Diehl, J W
|e verfasserin
|4 aut
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|a Fried, J C
|e verfasserin
|4 aut
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|a Markowitz, M A
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Zeinali, M
|e verfasserin
|4 aut
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| 700 |
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|a Melde, B J
|e verfasserin
|4 aut
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| 700 |
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|a Riley, A E
|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 25(2009), 21 vom: 03. Nov., Seite 12661-9
|w (DE-627)NLM098181009
|x 1520-5827
|7 nnns
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| 773 |
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|g volume:25
|g year:2009
|g number:21
|g day:03
|g month:11
|g pages:12661-9
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|u http://dx.doi.org/10.1021/la901334z
|3 Volltext
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