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 Unported |
|
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 |
|