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Absorption of Eriochrome Blue Black on Polyaniline/Attapulgite Nanocomposites
Adsorption Attapulgite (ATP) Eriochrome Blue Black Nanocomposity Polyaniline (PANI)
2011/11/15
Polyaniline/attapulgite (PANI/ATP) nanocomposites doped by hydrochloric acid (HCl) were prepared by in-situ polymerization method. The structure and absorption mechanism for eriochrome blue black of n...
Relationship between nanostructure and optical absorption in fibrous pink opals from Mexico and Peru
opal optical absorption nanostructure Raman palygorskite TEM
2011/11/11
Translucent pink opals from Mexico (states of Mapimi and Michoacan) and Peru (Acari area, near Arequipa) are opal-
CT, containing from 10 to 40 % palygorskite, as demonstrated by XRD, infrared absorp...
Structural Chemistry of Fe, Mn, and Ni in Synthetic Hematites as Determined by Extended X-Ray Absorption Fine Structure Spectroscopy
EXAFS Fe Oxides Hematite Metal Substitution Trace Elements XAS XRD
2011/12/6
Abstract: The incorporation of transition metals into hematite may limit the aqueous concentration and bioavailabity of several important nutrients and toxic heavy metals. Before predicting how hemati...
Characterization and Assignment of Far Infrared Absorption Bands of K+ in Muscovite
Dichroism Far Infrared Muscovite Potassium Transition Moment Vibration Mode
2011/12/6
Abstract: To assign far infrared (FIR) absorption bands of K+ in muscovite, dichroic experiments were performed. For a muscovite crystal rotated about a crystallographic axis, c*, a, or b, two bands c...
Reduction and Sorption of Chromium by Fe(II)-Bearing Phyllosilicates: Chemical Treatments and X-Ray Absorption Spectroscopy (XAS) Studies
Absorption Chromium EXAFS Phyllosilicates Reduction XANES
2011/12/6
Abstract: The reduction of hexavalent chromium species in aqueous solutions by interaction with Fe(II)-bearing solid surfaces was studied using a 0.96 × l0−3 M Cr(VI) solution and iron-rich clay...
Aliphatic hydrocarbons in structural channels of cordierite: A first evidence from polarized single-crystal IR-absorption spectroscopy
Aliphatic hydrocarbons channels of cordierite single-crystal IR-absorption spectroscopy
2012/3/31
Polarized IR-absorption spectra were measured on inclusion-free spots, 50 ?m in diameter of
(100)-, (010)-, and (001)-oriented single-crystal plates of orthorhombic cordierites extracted from
anatec...
Quantitative arsenic speciation in mine tailings using X-ray absorption spectroscopy
Quantitative arsenic speciation X-ray spectroscopy
2012/3/31
X-ray absorption fine structure spectroscopy (XAFS) was used to determine arsenic (As) oxidation state, local coordination (to a radius of ┆7Aⅹaround As), and the relative proportion of different As s...
Temperature dependence of the OH- absorption in the SiO2 glass and melt to 1975 K
Temperature dependence OH- absorption SiO2 glass
2012/3/31
FTIR absorbance spectra of SiO2 glass containing 1200 ppm OH2 groups were recorded in situ to 1975 K. There are only minor changes in peak height to 1700 K, indicating that the molar extinction coeffi...
Full multiple scattering calculations of the X-ray absorption near edge structure at the magnesium K-edge in pyroxene
Full multiple scattering calculations X-ray absorption magnesium K-edge
2012/3/31
We present a comparison between XANES experiments and full multiple-scattering cal-culations at the magnesium K-edge for two pyroxenes, diopside and enstatite, for which Mg atoms are only in the M1 si...
An IR absorption calibration for water in minerals
IR absorption calibration water minerals
2012/4/6
UsingIRabsorptiondatafrompolarizedmeasurementsonsingle-crystalmineralswithstoichiometricwatercontents(intheformofHOorOHgroupsinthestructure),alinear
calibrationcurve(r 0.98)forwaterinmineralsisestabl...
Wettability Contrasts in Kaolinite and Illite Clays: Characterization by Infrared and X-ray Absorption Spectroscopies
Adsorption Clay EXAFS Illite Infrared Kaolinite Wettability XANES
2011/12/9
Abstract: A reservoir rock is a porous geological formation in contact with 2 liquids, brine and oil. An improved knowledge of rock wettability is of primary importance to estimate the amount of crude...
A reexamination of absorption and enhancement effects in X-ray fluorescence trace element analysis
reexamination of absorption X-ray fluorescence trace element analysis
2012/4/6
In this paper, sample mass-absorption corrections for X-ray fluorescence trace element analysis are reexamined and a new approach is presented that is moreaccurate and more versatile than current meth...
Molecular Structure and Binding Sites of Cobalt(II) Surface Complexes on Kaolinite from X-ray Absorption Spectroscopy
Cobalt EXAFS Kaolinite Sorption Surface complex
2011/12/29
X-ray absorption spectroscopy (XAS) was used to determine the local molecular environment of Co(II) surface complexes sorbed on three different kaolinites at ambient temperature and pressure in contac...
27Al MAS NMR and Aluminum X-ray Absorption Near Edge Structure Study of Imogolite and Allophanes
Allophane Aluminum Imogolite NMR XANES
2011/12/29
This paper compares the results of 27Al nuclear magnetic resonance spectroscopy (NMR) and Al-K-edge X-ray Absorption Near Edge Structure (XANES) of natural imogolite and allophanes and some crystallin...
Assignment of the Far-Infrared Absorption Bands of K in Micas
Dichroism Far-infrared spectroscopy Mica Potassium Vermiculite
2011/12/31
To identify the far-infrared (FIR) absorption bands related to K cations in micas, spectra of muscovite, phlogopite, and biotite were compared with the spectra of pyrophyllite and talc, which have no ...