The crystal structure and chemistry of several palygorskite samples with different geneses

Nasedkin, V. V.; Боева, Н. М.; Garbuzova, I. A.; Kovalchuk, M. V.; Vasiliev, Alexander L.

doi:10.1134/s1063774509050228

Cited by 22 publications

(6 citation statements)

References 7 publications

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“…Other characteristic Si-O bands occur in the 800-430 cm −1 region. The bands appear to agree with Nasedkin et al (2009) in their research of palygorskite. Additionally, the results are comparable to ATR-FTIR data gathered by Madejová and Komadel (2001), who provide a complete list of band assignments for palygorskite.…”

Section: Maya Bluesupporting

confidence: 68%

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Non-invasive Spectroscopic Investigation of a Sixteenth-Century Polychrome Aztec Picture Map on Deerskin

Stanley

2015

Restaurator. International Journal for the Preservation of Library and Archival Material

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Princeton University Library's rare sixteenth-century polychrome Aztec picture map on deerskin vividly portrays the conversion of the Aztecs to Catholicism during the Early Colonial Period of the Spanish Conquest. A non-invasive technical examination was conducted to identify the colourants and the species of the animal hide support used in the creation of the map. Analysis included spectroscopic techniques such as attenuated total reflectance-Fourier transform infrared spectroscopy and ultraviolet-visible spectroscopy. Light microscopy and UVA fluorescence were also employed as tools. Results of the technical examination found the presence of cochineal, bone black, Maya blue, which are indigenous colourants traditionally associated with Mesoamerica, and a layer of an unknown greenishyellow dye over Maya blue to create the colour green. The examination also discovered what appears to be an orange-yellow gamboge-like substance known as American (sometimes called Mexican) gamboge, which is indigenous to Mexico and parts of Central and South America. Its plant family is Hypericaceae, which is very closely related to Clusiaceae. Clusiaceae is the Southeast Asian and Indian plant family of gamboge, which is commonly used as a pigment in Western, Indian and Asian art. The study's exposure of the obscure substance may spur more research into its use as a colourant of the Mesoamerican palette. The paper also hopes to add to the overall knowledge of Mesoamerican materials in order to better understand aspects of their conservation and preservation.

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Section: Maya Bluesupporting

confidence: 68%

“…It is composed of indigo, an organic pigment, whose chief colouring component is (Nasedkin et al 2009). Maya blue's composition is an organic-inorganic pigment complex.…”

Section: Maya Bluementioning

confidence: 99%

Non-invasive Spectroscopic Investigation of a Sixteenth-Century Polychrome Aztec Picture Map on Deerskin

Stanley

2015

Restaurator. International Journal for the Preservation of Library and Archival Material

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“…15,16 Diffractograms of PE-PLG composites contain a maximum at 2u 5 8.38, relating to scattering of palygorskite fibers. 18 Examination of the main PE maxima (110) and (200) (2u 5 21.48 and 23.78) showed that they retain their shape and angular position in the filled samples, while their intensity diminishes because of decrease in PE content in the systems.…”

Section: Morphology Of Pe-matrix In the Compositesmentioning

confidence: 98%

“…Palygorskite (PLG) is another clay mineral which consists of silicate fibers with the length 600-1100 nm and diameter 5-15 nm. 17,18 Particles of both MMT and PLG have high aspect ratios (more than 30). Unlike them, a third filler-glass microspheres (GS) with the mean diameter 20 mm-is isotropic.…”

Section: Introductionmentioning

confidence: 99%

Tensile behavior of polyolefin composites: the effect of matrix parameters

Guseva

Gerasin

Shklyaruk

2016

J of Applied Polymer Sci

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Polyolefin composites were prepared from 14 PE matrices and three different mineral fillers (montmorillonite, palygorskite and glass microspheres) via melt compounding in an extruder. Mechanical properties of the obtained systems were analyzed with emphasis on elongation at break and conditions for ductile/brittle failure were determined. When filler content is raised beyond a certain "critical" value, tensile properties are dramatically altered and transition occurs from ductile behavior to brittle fracture. This transition is displayed by a well-defined "step" on the plot of strain at break versus concentration of particles. The value of "critical filler content" was found to depend mainly on level of crystallinity of a matrix while other parameters (chemical nature of filler particles, their size, shape and surface treatment) are less significant. "Critical filler content" will decrease with growth of crystallinity of a polymer and with highly crystalline HDPEs it is as low as 2-8 vol %. Otherwise, with noncrystallizing and low-crystalline polymers elongation at break decreases gradually with concentration of mineral particles and ductile type deformation is maintained at fairly large filler fractions. The results presented here will be useful for a proper selection of a matrix polymer in composites with mineral fillers.

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“…The density of palygorskite is 2000-2300 kg/m 3 , and its Mohs hardness is from 2 to 2.5 [10]. Palygorskite minerals often contain a fraction of montmorillonite particles [11]. Since these minerals have similar chemical nature and density, it is difficult to separate them fully.…”

Section: Preparation Of Samplesmentioning

confidence: 99%

Atomic Force Microscopy of Structural-Mechanical Properties of Polyethylene Reinforced by Silicate Needle-Shaped Filler

Морозов¹,

Garishin²,

Shadrin³

et al. 2016

Advances in Materials Science and Engineering

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The paper presents the results of experimental studies of polyethylene-based composites reinforced with silicate needle-shaped filler (palygorskite) of different mass fraction (0, 5, 10, and 15%). These composites are less flammable and fire toxic than unfilled polyethylene. The structure (size, shape, and agglomeration of filler) and local mechanical properties of composites in nonstretched and elongated states were investigated by AFM. In stretched samples palygorskite takes a wavy shape, and at extremely high elongation the filler is orthogonal to the axis of tension. The smooth surfaces of the samples, required for AFM, were prepared using the heating/cooling procedure.

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The crystal structure and chemistry of several palygorskite samples with different geneses

Cited by 22 publications

References 7 publications

Non-invasive Spectroscopic Investigation of a Sixteenth-Century Polychrome Aztec Picture Map on Deerskin

Non-invasive Spectroscopic Investigation of a Sixteenth-Century Polychrome Aztec Picture Map on Deerskin

Tensile behavior of polyolefin composites: the effect of matrix parameters

Atomic Force Microscopy of Structural-Mechanical Properties of Polyethylene Reinforced by Silicate Needle-Shaped Filler

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