Molecular dynamics and solid-solid phase transformation kinetics studies of tert-butyl chloride confined in mesoporous silica by NQR
In this paper, we study the effect of a porous adsorbent, such as silica with a pore diameter of 375 Å on the molecular dynamics and the solid-solid phase transformations of tert-butyl chloride (t-BC) inside the pores by means of chlorine nuclear quadrupole resonance (NQR). The spin-lattice relaxati...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2005 |
| País: | Argentina |
| Institución: | Consejo Nacional de Investigaciones Científicas y Técnicas |
| Repositorio: | CONICET Digital (CONICET) |
| Idioma: | inglés |
| OAI Identifier: | oai:ri.conicet.gov.ar:11336/36641 |
| Acceso en línea: | http://hdl.handle.net/11336/36641 |
| Access Level: | acceso abierto |
| Palabra clave: | Molecular Dynamics Nqr Phase Transitions Silica Tert-Butyl Chloride |
| Sumario: | In this paper, we study the effect of a porous adsorbent, such as silica with a pore diameter of 375 Å on the molecular dynamics and the solid-solid phase transformations of tert-butyl chloride (t-BC) inside the pores by means of chlorine nuclear quadrupole resonance (NQR). The spin-lattice relaxation time (T1) and the resonance frequency (νQ) as a function of temperature for t-BC, both in bulk and confined in the silica mesopores, have been measured. Changes are observed in the molecular dynamics and in the phase transition temperatures of the t-BC confined in the pores with respect to those corresponding to the t-BC in bulk. Likewise, phase transformation kinetics would seem to be altered due to restrictions of the molecular movement as a consequence of the confinement inside the porous material. |
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