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  • Guest-host van der Waals interactions decisively affect the molecular transport in mesoporous media
    Ukmar Godec, Tina ...
    We present clear evidence that the global (macroscopic) transport from/to mesoporous materials is significantly affected by the interactions between themesoporous host and the guest molecules. The ... problem is considered in a most general way so the solutions apply for a variety of cases such as the release of a guest from porous matrices, catalysis occurring in porous materials or processes taking place in separation techniques. The concept is proved on the experimentally determined release profiles of a model drug (indomethacin) from accurately designed SBA-15 and MCM-41 mesoporous silicates. In order to allow for a full quantitative analysis, a very high frequency of sampling was carried out at short release times. The agreement between the experimentally determined and the theoretically predicted curves is excellent not only in shape but also in all major trends. In the broadest sense, one might say that the host-guest interactions change the effective cross-section of pores through which the transport of guest occurs. In addition, the interactions lower the efficiency of utilization of the guest. In drug release this is observed as a decrease of released matter at long times, in catalysis this would correspond to a decrease of global turnover efficiency etc. However, it is not only the final outcome that is affected but also the transport pattern (e.g. the shape of release curves) during a widerange of timescales. Our finding might have a profound influence on the design of various devices based on meso- or macroporous materials.
    Vir: Journal of materials chemistry. - ISSN 0959-9428 (Vol. 22, no. 3, 2012, str. 1112-1120)
    Vrsta gradiva - članek, sestavni del
    Leto - 2012
    Jezik - angleški
    COBISS.SI-ID - 4837914

    Povezava(-e):

    http://pubs.rsc.org/en/content/articlelanding/2012/jm/c1jm13493k
    DOI

vir: Journal of materials chemistry. - ISSN 0959-9428 (Vol. 22, no. 3, 2012, str. 1112-1120)
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