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Vignali Francesca Predieri Giovanni Feci Elisabetta Palanti Sabrina Baratto Maria Camilla Basosi Riccardo Callone Emanuela Müller Klaus 《Journal of Sol-Gel Science and Technology》2011,60(3):445-456
Interpenetration of wood samples of pine sapwood (Pinus sylvestris L.) with hybrid inorganic–organic silica xerogels bearing amine functions able to coordinate copper(II) cations has been
successfully carried out. These materials have been prepared by sol–gel processing TEOS/APTES mixtures inside the wood. Solid
state 29Si NMR data provide evidence that the interpenetrated xerogel material has the same degree of condensation of the corresponding
xerogel formed outside the wood. Copper(II) is effectively vehiculated inside the wood by coordination linkages with two ammine
functions well evidenced by ESR measurements. SEM/EDX investigations show that the chlorine/copper atomic ratio inside the
wood is lower than that of the starting salt CuCl2, suggesting an exchange reaction with silanol groups with the formation of Si–O–Cu linkages and HCl. This reaction could
be promoted by the excess of amine functions with formation of ammonium chloride species which remain onto the surface of
the wood and in the mother solution owing to a higher degree of condensation. Sodium silicate was tested in place of TEOS
in order to have a cheaper and ethanol-free formulation. However, gel penetration results significantly lower than that of
the corresponding formulation containing TEOS and preservation performance are lower than that of TEOS formulation against
brown-rot fungal decay. 相似文献
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