For Whom a Puddle is the Sea? Adsorption of Organic Guests on Hydrated MCM-41 Silica.

For Whom a Puddle is the Sea? Adsorption of Organic Guests on Hydrated MCM-41 Silica.
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对于谁来说,水坑就是大海?

DOI:
10.1021/acs.langmuir.0c02327
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发表时间:
2020
期刊:
Langmuir : the ACS journal of surfaces and colloids
影响因子:
--
通讯作者:
I. Shenderovich
I. Shenderovich
中科院分区:
--
文献类型:
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作者:
I. Shenderovich

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Thermal and hydration effects on mobility of compact and branched organic molecules and a bulky pharmaceutical substance loaded in submonolayer amounts onto mesoporous silica have been elucidated using 1H and 31P solid-state NMR. In all cases, the ambient hydration has a stronger effect than an increase in temperature to 370 K for water-free silica. The effect of hydration depends on the guest and ranges from complete solvation to a silica-water-guest sandwich structure to silica-guest/silica-water pattern. The mobility of the guests under different conditions has been described. The specific structure of the MCM-41 surface allows one to study very slow surface diffusion, a diffusivity of about 10-15 - 10-16 m2/s. The data reported are relevant to any non-functionalized silica, while the method used is applicable to any phosphor-containing guest on any host.
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