Widespread iron oxide precipitation from groundwater in fine-grained red beds displays various patterns, including nodulation, banding and scallops and fingers. Hematite nodules have been reported also from the Meridiani Planum site on Mars and interpret
In the Supporting Information appear FTIR spectra, thermogravimetric measurements, calculation of crystallite sizes, DLS measurements, and EMR of samples deposited on a filter paper measured in plane (θ = 0°) and out of plane (θ = 90°). Download: Download Acrobat PDF file (...
3 mL isopropanol solvent, 50 mg catalyst (molar ratio of Fe to FF is 0.13% for Fe-ZIF-8-800 catalyst), 120 °C, 6 h. The iron loading of Fe-ZIF-8-800 at 80 °C and 3 h is 0.3 wt% (0.54 mol%). The details for the calculation of TOFs are listed ...
(66), which is based on the so-called reduced Shannon entropy, calculated for each alignment position i using the expression, (Eq. 1)St=∑σ=1mpσ(i)ln(pσ(i))+m*-1/2nIn the first part of the equation, which represents a standard Shannon entropy calculation, σ is a given class...
due to the buffering capacity of alkaline mineral108. CAM4107did not include the thermodynamic equilibrium modules, and pH = 2 was prescribed when the concentration of sulfate aerosol was larger than the concentration of calcium35. The pH calculation was updated for CAM515by lowering the ...
The speciation calculation consists essentially of two steps: the pH is first computed numerically, followed by the analytical calculations that describe the speciation. Numerically, the pH calculation comes down to the solution of a set of non-linear algebraic equations as determined by the mass act...
Based on a mass balance calculation, we have calculated that this source should vary within a range from − 0.7 to − 0.2‰, with Δ56FeFe(II)aq-mineral variations from − 1.5 to − 0.5‰10,11,14,40. This is also unlikely because isotopic signature of solubilized Fe(III...
Iron fluoride, an intercalation-conversion cathode for lithium ion batteries, promises a high theoretical energy density of 1922 Wh kg–1. However, poor electrochemical reversibility due to repeated breaking/reformation of metal fluoride bonds pose
Finally, the calculation of phosphorus and phytic acid content was carried out following Megazyme instructions. 2.4. Phytic acid:iron and phytic acid:zinc molar ratios The contents of phytic acid, Fe and Zn, were converted into moles by dividing by their respective molar mass and atomic weight ...
We also made the calculation of the EXAFS spectra by assuming V adsorption on the Ni–Fe LDH layer or occupying the interstitial position. It turns out that in both cases the calculated spectra are quite different from the experimental V K-edge EXAFS spectra of Ni3Fe0.5V0.5 (Supplementary ...