Surface modification of bricks by chitosan coatings

Authors

  • Siripan Nilpairach Metallurgy and Materials Science Research Institute, Chulalongkorn University
  • Stephan T. Dubas Metallurgy and Materials Science Research Institute, Chulalongkorn University

Keywords:

Hydrophobic, Coating, Chitosan

Abstract

Bricks were successfully modified by application of a chitosan coating in order to provide their surface with a water repellant character. The chitosancoating was prepared by depositing solutions of variable chitosan concentration (1% or 2.5% w/w) onto the brick surface and let to dry under ambient condition. In order to improve the water repellant property, the films were cross-linked with a 1% solution of sodium citrate, sodium sulfate or sodium tripolyphosphate. The effect of the chitosan concentration on the morphology of the coating at the brick surface was observed by scanning electron microscope (SEM). It was found that the brick surface porosity can be completely covered by the 2.5% chitosan solution leading to the formation of a very smooth surface. The effect of the different cross-linking agents was evaluated by measuring the time needed for a 100 μL drop of water to penetrate through the chitosan coating into the bricks. Using this technique, it was shown that the citrate cross-linked films provide the best water resistance to the brick surface. This type of coating could be used in application where water resistant bricks are needed such as freeze/thaw cycles or in roof tile applications.

Downloads

Download data is not yet available.

References

Tsakalof A., Manoudis P., Karapanagiotis I., Chryssoulakis I. and Panayiotou C. 2007. Assessment of synthetic polymeric coatings for the protection and preservation of stone monument. J. Cult. Herit. 8 : 69-72.

Alesandrini, G., Aglietto, M., Castelvetro, V., Ciardelli, F., Peruzzi, R. and Toniolo, L. 2000. Comparative evaluation of fluorinated and unfluorinated acrylic copolymers as waterrepellent coating materials for stone. J. Appl. Polym. Sci. 76 : 962-977.

Toniolo, L., Poli, T., Castelvetro, V., Manariti, A., Chiantore, O. and Lazzari, M. 2002. Tailoring new fluorinated acrylic copolymers as protective coasting for marble. J. Cult. Herit. 3 : 309-316.

Chiantore, O. and Lazzari, M. 2001. Photo-oxidative stability of paraloid acrylic protective polymers.Polymer. 42 : 17-27.

Lee, O.S., Ha, B.J., Park, S.N. and Lee, Y.S. 1997. Studies on the pH-dependent swelling properties and morphologies of chitosan/calcium-alginate complexed beads, Macromol. Chem. Phys. 198 : 2971–2976.

Bayomi, M.A., Al-Suwayeh, S.A., El-Helw, A.M. and Mesnad, A.F. 1998. Preparation of casein-chitosan microspheres containing diltiazem hydrochloride by and aqueous coacervation technique. Pharm. Acta Helvetiae. 73 : 187–192.

Mi, F.L., Shyu, Chen, S.S., Chen, C.T. and Schoung, J.Y. 1999. Porous chitosan microsphere for controlling the antigen release of Newcastle disease vaccine: preparation of antigen-adsorbed microsphere and in vitro release. Biomaterials. 20 : 1603–1612.

Mi F.L., Sung, H.W. and Shyu, S.S. 2001. Release of indomethacin from a novel chitosan microsphere prepared by a naturally occurring crosslinker: Examination of crosslinking and polycation-anionic drug interaction. J. Appl. Polym. Sci. 81 : 1700– 1711.

Ko, J.A., Park, H.J., Hwang, S.J., Park, J.B. and Lee, J.S. 2002. Preparation and characterization of chitosan microparticles intended for controlled drug delivery. Int. J. Pharm. 249 : 165-174.

Shu, X.Z. and Zhu, K.J. 2002. Controlled drug release properties of ionically cross-linked chitosan beads: the influence of anion structure. Int. J. Pharm. 233 : 217-225.

Downloads

Published

2017-04-23

How to Cite

[1]
S. Nilpairach and S. T. Dubas, “Surface modification of bricks by chitosan coatings”, J Met Mater Miner, vol. 18, no. 1, Apr. 2017.

Issue

Vol. 18 No. 1 (2008)

Section

Original Research Articles

License

Copyright (c) 2017 Journal of Metals, Materials and Minerals

Creative Commons License

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Authors who publish in this journal agree to the following terms:

    1. Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgment of the work's authorship and initial publication in this journal.

 

    1. Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgment of its initial publication in this journal.