van Beek, WouterTsiantos, ConstantinosSuarez, MercedesΓκιώνης, ΒασίληςBoccaleri, EnricoMilanesio, MarcoΧρυσικός, Γεώργιος Δ.Sanchez del Rio, ManuelGarcia-Romero, EmiliaCroce, GianlucaKacandes, George H.NEW YORKThe heating process (30-200 A degrees C) of a palygorskite-indigo mixture has been monitored in situ and simultaneously by synchrotron powder diffraction and Raman spectroscopy. During this process, the dye and the clay interact to form Maya blue (MB), a pigment highly resistant to degradation. It is shown that the formation of a very stable pigment occurs in the 70-130 A degrees C interval; i.e., when palygorskite starts to loose zeolitic water, and is accompanied by a reduction of the crystallographic a parameter, as well as by alterations in the C=C and C=O bonds of indigo. Mid- and near-infrared spectroscopic work and microporosity measurements, employed to study the rehydration process after the complex formation, provide evidence for the inhibition of the rehydration of MB as compared with palygorskite. These results are consistent with the blocking of the palygorskite tunnel entrance by indigo molecules with a possible partial penetration inside the tunnels. The surface silanols of palygorskite are not perturbed by indigo, suggesting that MB is not a surface complex.5524-5536Adobe PDF0022-246110.1007/s10853-009-3772-5https://hdl.handle.net/10442/12644engSpringer New York LLC© SPRINGER© SPRINGERJournal of Materials Science (incorporating Journal of Materials Science: Letters and Interface Science)Materials Science, MultidisciplinaryA combined synchrotron powder diffraction and vibrational study of the thermal treatment of palygorskite-indigo to produce Maya blueΆρθρο σε επιστημονικό περιοδικό2009-10Δημοσίευση σε περιοδικόPublication in journalΤεχνολογία μέσωνMedia TechnologyΕπιστημονικό άρθροScientific articleΕθνικό Ίδρυμα Ερευνών (ΕΙΕ)Greek Aggregator OpenArchives.gr | National Documentation Centre (EKT)