2005
DOI: 10.1107/s0909049504026172
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Synchrotron and simulations techniques applied to problems in materials science: catalysts and Azul Maya pigments

Abstract: Development of synchrotron techniques for the determination of the structure of disordered, amorphous and surface materials has exploded over the past 20 years owing to the increasing availability of high-flux synchrotron radiation and the continuing development of increasingly powerful synchrotron techniques. These techniques are available to materials scientists who are not necessarily synchrotron scientists through interaction with effective user communities that exist at synchrotrons such as the Stanford S… Show more

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Cited by 27 publications
(32 citation statements)
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References 13 publications
(13 reference statements)
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“…• The surface silanols are not modified in the presence of indigo and rehydrate fully after MB formation, a result that is incompatible with the description of MB as a "surface compOlll1 d," as suggested in some works [18,21].…”
Section: Discussionmentioning
confidence: 84%
See 1 more Smart Citation
“…• The surface silanols are not modified in the presence of indigo and rehydrate fully after MB formation, a result that is incompatible with the description of MB as a "surface compOlll1 d," as suggested in some works [18,21].…”
Section: Discussionmentioning
confidence: 84%
“…A second possible structural approach proposed by Kleber et al [17] would allow indigo to penetrate (partially or deeper) into the clay tunnels. It can be found literature supporting Van Olphen [18][19][20][21][22] and Kleber [13,[23][24][25][26] models. More recently, Hubbard et al [6] suggested the covering of the opening of nano-tmmels by the indigo molecules.…”
Section: Introductionmentioning
confidence: 99%
“…The physical and chemical properties are characterized using various experimental techniques (optical microscopy, scanning electron microscopy (SEM), (HRTEM), X-ray powder diffraction (XRD), infrared absorption and Raman scattering spectroscopy, thermogravimetric analysis (TGA) and surface analysis) and these results are complimented by density functional theory (DFT) calculations. Details of the analytical techniques not described in this report can be found in reference [14,15]. The solid-state chemical interaction phenomenon that gives rise to the pigments stability is shown to be a surface interaction between the organic and inorganic components.…”
Section: Introductionmentioning
confidence: 97%
“…The disappearance of the crystalline indigo structure upon heating as determined with synchrotron X-ray diffraction, and the fact that the palygorskite structure undergoes little change with no visible peak broadening and shifting, lead to the conclusion that the organic/inorganic nanocomposite is a surface compound. 2 The organic molecules for a 16% wt indigo concentration are primarily bound to the surface of the palygorskite with only limited penetration of the channels because of the fibrous nature of the clay, which offers limited surface area for penetration at the ends of the fibers.…”
Section: F S Manciu Et Almentioning
confidence: 99%
“…4,6 The most prevalent hypothesis states that as a result of the heating process, water molecules are eliminated from the entrances of the channels of fibrous palygorskite, and the dye molecules enter into these open channels. 2,4,5 The formation of H-bonds between the indigo carbonyl group and the nearest structural water was suggested as the cause of anchoring the dye inside the clay structure, and the justification for the pigment stability. 7 Another hypothesis involving the presence of metallic nanoparticles such as iron oxide and an amorphous phase of iron hydroxide was also suggested to explain the pigment stability.…”
Section: Introductionmentioning
confidence: 99%