David Avnir and colleagues have reported encapsulation of enzymes and also of acidic and basic catalysts, see, for example, Chem. Mater. 1994,6, 1605-1614; J. Am. Chem. Soc., 2002, 124 (48), pp 14460–14463; Scientific Reports 5, Article number: 14411, (2015), doi:10.1038/srep14411; Chem. Mater., 2016, 28 (7), pp 2248–2253.

This is an interesting question, even i would wait for an appropriate answer

Silica coated Fe particles using the sol-gel technic can be  very useful as magnetic probe.  

I appreciate the answers of all of you, I tried to encapsulate DMG to detect Ni2+ metal ion from aqueous solution. I still need to optimize the detection parameters.