Distribution of functional groups in periodic Mesoporous organosilica materials studied by small-angle neutron scattering with in situ adsorption of nitrogen

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dc.identifier.uri http://dx.doi.org/10.15488/586
dc.identifier.uri http://www.repo.uni-hannover.de/handle/123456789/610
dc.contributor.author Sharifi, Monir
dc.contributor.author Wallacher, Dirk
dc.contributor.author Wark, Michael
dc.date.accessioned 2016-10-31T10:06:39Z
dc.date.available 2016-10-31T10:06:39Z
dc.date.issued 2012
dc.identifier.citation Sharifi, Monir; Wallacher D.; Wark M.: Distribution of functional groups in periodic Mesoporous organosilica materials studied by small-angle neutron scattering with in situ adsorption of nitrogen. In: Beilstein Journal of Nanotechnology 3 82012), Nr. 1, S. 428-437. DOI: http://dx.doi.org/10.3762/bjnano.3.49
dc.description.abstract Periodic mesoporous materials of the type (R'O) 3Si-R-Si(OR') 3 with benzene as an organic bridge and a crystal-like periodicity within the pore walls were functionalized with SO 3H or SO 3 - groups and investigated by small-angle neutron scattering (SANS) with in situ nitrogen adsorption at 77 K. If N 2 is adsorbed in the pores the SANS measurements show a complete matching of all of the diffraction signals that are caused by the long-range ordering of the mesopores in the benzene-PMO, due to the fact that the benzene-PMO walls possess a neutron scattering length density (SLD) similar to that of nitrogen in the condensed state. However, signals at higher q-values (>1 1/Å) are not affected with respect to their SANS intensity, even after complete pore filling, confirming the assumption of a crystal-like periodicity within the PMO material walls due to π-π interactions between the organic bridges. The SLD of pristine benzene-PMO was altered by functionalizing the surface with different amounts of SO3H-groups, using the grafting method. For a low degree of functionalization (0.81 mmol SO 3H·g -1) and/or an inhomogeneous distribution of the SO 3H-groups, the SLD changes only negligibly, and thus, complete contrast matching is still found. However, for higher amounts of SO 3H-groups (1.65 mmol SO 3H·g -1) being present in the mesopores, complete matching of the neutron diffraction signals is no longer observed proving that homogeneously distributed SO 3H-groups on the inner pore walls of the benzene-PMO alter the SLD in a way that it no longer fits to the SLD of the condensed N 2. eng
dc.description.sponsorship DFG/WA 1116/15
dc.description.sponsorship DFG/SPP 1181
dc.description.sponsorship EC/FP7/RII3-CT-2003-505925 NMI
dc.language.iso eng
dc.publisher Frankfurt am Main : Beilstein-Institut Zur Förderung der Chemischen Wissenschaften
dc.relation.ispartofseries Beilstein Journal of Nanotechnology 3 82012), Nr. 1
dc.rights CC BY 2.0
dc.rights.uri https://creativecommons.org/licenses/by/2.0/
dc.subject Contrast matching eng
dc.subject Crystal-like periodicity eng
dc.subject Distribution of functional groups eng
dc.subject Pmo eng
dc.subject Sans eng
dc.subject Surface functionalization eng
dc.subject Contrast matching eng
dc.subject Crystal-like periodicity eng
dc.subject Pmo eng
dc.subject Sans eng
dc.subject Surface Functionalization eng
dc.subject Benzene eng
dc.subject Functional groups eng
dc.subject Mesoporous materials eng
dc.subject Neutron diffraction eng
dc.subject Neutron scattering eng
dc.subject Nitrogen eng
dc.subject Pore pressure eng
dc.subject Quay walls eng
dc.subject Silica eng
dc.subject Silicon eng
dc.subject Gas adsorption eng
dc.subject.ddc 500 | Naturwissenschaften ger
dc.title Distribution of functional groups in periodic Mesoporous organosilica materials studied by small-angle neutron scattering with in situ adsorption of nitrogen
dc.type article
dc.type Text
dc.relation.issn 2190-4286
dc.relation.doi http://dx.doi.org/10.3762/bjnano.3.49
dc.bibliographicCitation.issue 1
dc.bibliographicCitation.volume 3
dc.bibliographicCitation.firstPage 428
dc.bibliographicCitation.lastPage 437
dc.description.version publishedVersion
tib.accessRights frei zug�nglich


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