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| Content Provider | PubMed Central |
|---|---|
| Author | Sharifi, Monir Dirk, Wallacher Wark, Michael |
| Editor | Schneider, Jörg J. |
| Copyright Year | 2012 |
| 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 SO3H or SO3 − groups and investigated by small-angle neutron scattering (SANS) with in situ nitrogen adsorption at 77 K. If N2 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 SO3H·g−1) and/or an inhomogeneous distribution of the SO3H-groups, the SLD changes only negligibly, and thus, complete contrast matching is still found. However, for higher amounts of SO3H-groups (1.65 mmol SO3H·g−1) being present in the mesopores, complete matching of the neutron diffraction signals is no longer observed proving that homogeneously distributed SO3H-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 N2. |
| Related Links | http://dx.doi.org/10.3762/bjnano.3.49 |
| Ending Page | 437 |
| Page Count | 10 |
| Starting Page | 428 |
| File Format | |
| ISSN | 21904286 |
| e-ISSN | 21904286 |
| Journal | Beilstein Journal of Nanotechnology |
| Volume Number | 3 |
| Language | English |
| Publisher | Beilstein-Institut |
| Publisher Date | 2012-05-01 |
| Access Restriction | Open |
| Rights Holder | Beilstein-Institut |
| Subject Keyword | Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Nanoscience and Nanotechnology Physics and Astronomy Electrical and Electronic Engineering |
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