RT Journal Article
T1 A combined synchrotron powder diffraction and vibrational studyof the thermal treatment of palygorskite–indigo to produce Mayablue
A1 Sánchez del Río, Manuel
A1 Boccaleri, Enrico
A1 Milanesio, Marco
A1 Croce, Gianluca
A1 Beek, Wouter van
A1 Tsiantos, Constantinos
A1 Chyssikos, Georgios D.
A1 Gionis, Vassilis
A1 Kacandes, Georges H.
A1 Súarez Barrios, Mercedes
A1 García Romero, Emilia
AB The heating process (30–200 ºC) of a palygorskite-indigo mixture has been monitored in situ andsimultaneously by synchrotron powder diffraction andRaman spectroscopy. During this process, the dye and theclay interact to form Maya blue (MB), a pigment highlyresistant to degradation. It is shown that the formation of avery stable pigment occurs in the 70–130 ºC interval; i.e.,when palygorskite starts to loose zeolitic water, and isaccompanied by a reduction of the crystallographic aparameter, as well as by alterations in the C=C and C=Obonds of indigo. Mid- and near-infrared spectroscopicwork and microporosity measurements, employed to studythe rehydration process after the complex formation, provideevidence for the inhibition of the rehydration of MB ascompared with palygorskite. These results are consistentwith the blocking of the palygorskite tunnel entrance byindigo molecules with a possible partial penetration insidethe tunnels. The surface silanols of palygorskite are notperturbed by indigo, suggesting that MB is not a surfacecomplex.
PB Springer Netherlands
SN 0022-2461
YR 2009
FD 2009
LK https://hdl.handle.net/20.500.14352/49753
UL https://hdl.handle.net/20.500.14352/49753
LA eng
DS Docta Complutense
RD 5 abr 2025