Restricted diffusion in silica particles measured by pulsed field gradient NMR
The restricted diffusion coefficient of water through porous silica is measured by pulsed field gradient (PFG) NMR as a function of loading in order to develop a model for self-diffusion at full pore filling in sol-gel-made porous silica particles. This model describes the pore or intraparticle diff...
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| Veröffentlicht in: | Journal of colloid and interface science 2004-06, Vol.274 (1), p.216-228 |
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| container_end_page | 228 |
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| container_issue | 1 |
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| container_title | Journal of colloid and interface science |
| container_volume | 274 |
| creator | Veith, Susanne R. Hughes, Eric Vuataz, Gilles Pratsinis, Sotiris E. |
| description | The restricted diffusion coefficient of water through porous silica is measured by pulsed field gradient (PFG) NMR as a function of loading in order to develop a model for self-diffusion at full pore filling in sol-gel-made porous silica particles. This model describes the pore or intraparticle diffusion coefficient as a function of particle porosity, tortuosity, and the steric hindrance applied on the molecules by the pore space. The particle morphology is characterized by nitrogen adsorption and an appropriate tortuosity model is chosen in comparison with literature data. To characterize the material, NMR relaxation and diffusion studies at different degrees of pore filling were carried out in relation to the silica/water adsorption isotherm. |
| doi_str_mv | 10.1016/j.jcis.2003.12.036 |
| format | Article |
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| language | eng |
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| source | Elsevier ScienceDirect Journals Complete |
| subjects | Chemistry Degree of filling Exact sciences and technology General and physical chemistry Nuclear magnetic resonance (NMR) Restricted diffusion |
| title | Restricted diffusion in silica particles measured by pulsed field gradient NMR |
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