Download Protective nanomaterials coatings of ZnO and Ca(Zn(OH)3)2.2H2O

 Protective nanomaterials coatings of ZnO and
Ca(Zn(OH)3)2.2H2O for preventing biodeterioration
on calcareous rocks.
N.M. Gomez-Ortiz1; S. Gonzalez-Gomez1; M. Soria-Caso1; P.
Quintana1*; G. Oskam1*; O. Ortega-Morales2; S.C de la Rosa-García2
Depto. Física Aplicada, Cinvestav-IPN, Mérida, Yucatán, México. 2 Depto. Microbiología Ambiental y
Biotecnología, Universidad Autónoma de Campeche 1
*
E-mail: [email protected]; [email protected]
Keywords: Nanoparticles, fungus, Aspergillus sp. and Penicillium sp.
Abstract. In the last few decades, the increasing interest in preserving the cultural heritage, has led to the
development of new preventive and remedial methods for the conservation of materials [1]. Coatings in
stone conservation have, basically, three aims: to protect undamaged stones, to consolidate and preserve
the damage ones and to slow down their aging process. The main purpose of a coating is to reduce the
rate of decay of stone surface, and the most successful treatments being considered those which least alter
the stone characteristics, leaving it close to the untreated ones. A variety of materials has been studied in
the field of building restoration such as polymers, inorganic materials, organic materials, matrix
macromolecules (OMMs), etc [1]. For the present study nanoparticles such as Ca(OH)2, ZnO, and
Ca(Zn(OH)3)2.2H2O were synthesized by the sol gel method and applied to calcareous stones to
diminished the biodeterioration processes. Two different rocks were collected from quarries from the state
of Yucatan, Mexico, and selected, considering their regional significance, abundance and level of usage
as a construction material. The effect of two Aspergillus sp. and Penicillium sp. fungus on the
deterioration of stone and the protective properties of the applied nanomaterials, was studied.
Acknowledgements
This work was partially supported by CONACYT projects: 49275-F, FOMIX 108160 and 108528, and
LABINDETEC 123913.
References
[1] Biocolonization of stone: control and preventive methods: proceedings from the MCI workshop series
ed. A. Elena Charola, Christopher McNamara, and Robert J. Koestler, Pub. Smithsonian Inst.Scholarly
Press (2009)