Ferrous sulfate 4mg / Silica 1.6mg tablets

This paper summarizes the Spirit rover operations in the Columbia Hills of Gusev Crater from sols 513 to 1476 and provides an overview of selected findings that focus on synergistic use of the Athena Payload and comparisons to orbital data. Results include discovery of outcrops (Voltaire) on Husband Hill that are interpreted to be altered impact melt deposits that incorporated local materials during emplacement. Evidence for extensive volcanic activity and aqueous alteration in the Inner Basin is also detailed, including discovery and characterization of accretionary lapilli and formation of sulfate, silica, and hematite‐rich deposits. Use of Spirit's data to understand the range of spectral signatures observed over the Columbia Hills by the Mars Reconnaissance Orbiter's Compact Reconnaissance Imaging Spectrometer (CRISM) hyperspectral imager (0.4–4 μ m) is summarized. We show that CRISM spectra are controlled by the proportion of ferric‐rich dust to ferrous‐bearing igneous minerals exposed in ripples and other wind‐blown deposits. The evidence for aqueous alteration derived from Spirit's data is associated with outcrops that are too small to be detected from orbital observations or with materials exposed from the shallow subsurface during rover activities. Although orbital observations show many other locations on Mars with evidence for minerals formed or altered in an aqueous environment, Spirit's data imply that the older crust of Mars has been altered even more extensively than evident from orbital data. This result greatly increases the potential that the surface or shallow subsurface was once a habitable regime.

Abstract licence: CC BY

Magnetite and silica-coated magnetite (Fe 3 O 4 ) nanoparticles (NPs) were synthesized by water-in-oil (W/O) microemulsion method from hydrated ferric nitrate, ferrous sulfate precursors and ammonia a precipitating agent with the assistance of Tween-80 and SDS surfactants. The synthesized materials were characterized by X-ray diffraction, scanning electron microscopy, thermal analyzer, and infrared spectroscopy. X-ray diffraction pattern of Fe 3 O 4 showed that particles were phase pure with a cubic inverse spinel structure and FT-infrared spectra confirmed the presence of Fe-O bond in tetrahedral and octahedral interstitial sites. The crystallite size determined from powder XRD data with Scherer’s equation was in the range of 7.3 ± 0.05 nm–10.83 ± 0.02 nm for uncoated Fe 3 O 4 and 16 ± 0.14 nm for silica-coated Fe 3 O 4 NPs. The SEM micrographs of the uncoated Fe 3 O 4 oxide revealed the agglomeration of the magnetite (Fe 3 O 4 ) particles. But the silica-coated Fe 3 O 4 oxide exhibited homogeneous distribution of particles with relatively less agglomerate of the particles. The particle size of Fe 3 O 4 NPs slightly increased with the temperature and precursor concentration. The antimicrobial activities of Fe 3 O 4 and silica-coated Fe 3 O 4 nanoparticles were tested against Gram-negative ( Escherichia coli and Pseudomonas aeruginosa ) and Gram-positive ( Staphylococcus aureus and Bacillus subtilis ) bacteria. Both Fe 3 O 4 and silica-coated Fe 3 O 4 NPs demonstrated better antimicrobial activities.

Abstract licence: CC BY

Abstract This study examined the effects of adding iron to rice hulls samples (RHs) on the thermal degradation to prepare nano silica and iron oxide-silica mixtures. Iron is precipitated in different amounts within the RH fibers (as hydroxide) by dipping them in a solution of different concentrations of acidic ferrous sulfate and then immersing it in a dilute ammonia solution. The dry RHs were fired at temperatures between 400 °C and 700 °C in a static or limited air atmosphere. Both weight loss and residual weight are determined to follow its thermal degradation. The products of the RH degradation of silica or iron oxide-silica mixtures were characterized by X-ray diffraction and Fourier transform infrared spectroscopy. The surface area, average particle size, and pore diameter of both products were determined. The chemical treatment of RHs before firing accelerates their thermal degradation and leads to obtaining firing products of high purity. Firing RHs in a limited air atmosphere increases thermal degradation and, at the same time, accelerates the catalyst effect of iron on its degradation. Under these conditions, silica and iron oxide bonded silica with an average particle size of 1.31 and 0.07 μm were obtained by firing treated RHs at 600 °C and 500 °C, respectively. Firing in a limited air atmosphere encourages CO 2 to react with burned C to form CO, and iron as an accelerator for this reaction completes its degradation. In contrast, iron oxide remained in the ferrous state. Therefore, the bonding between iron and silica was complete.

Abstract licence: CC BY

This exploratory study investigates the use of waste foundry sand (WFS), combined with supplement cementitious materials (SCMs), in concrete production. The Preliminary Investigation is based on three groups, where the first group studies different percentages of natural sand replacement with WFS (i.e. 5%, 10%, 15% and 20%), the second group analyses the addition of 5% silica fume with WFS, and the third group observes 10% metakaolin inclusion with WFS. The studied parameters include density, nondestructive test (UPV), compressive and tensile strength, acid resistance, and environmental benefit analysis. According to the results, the compressive strength of the concrete mix is enhanced by 17% by adding 20% WFS and 5% silica fume, and this value increases by 23% when adding an additional 10% metakaolin. Furthermore, the use of 20% WFS leads to a 3.27% decrease in the cost of concrete as compared to the control mix, with a decrease of 2.1% and 5.1% for silica and metakaolin-containing mixes, respectively.

Abstract licence: CC BY

Iron metal-based energy storage devices hold great potential in stationary grid-scale sustainable energy due to the high theoretical specific capacity, ultralow cost, and abundance of iron. However, their practical deployment is limited by the poor reversibility of iron plating and stripping, as well as competitive hydrogen evolution. Here we introduce the concept of hydrotropy into iron electrolytes by developing an environmentally friendly and cost-effective high-concentration ferrous sulfate electrolyte using urea as a hydrotropic agent. The designed electrolyte increases the Coulombic efficiency of iron metal electrodes to approximately 96.5%, compared with ~84.6% for the dilute electrolyte. Molecular dynamics simulations and Raman spectroscopy illustrate that urea regulates the competitive coordination of anions and urea in the iron solvation sheath, while reconstructing the hydrogen-bond network in free water molecules. This reduces the activity of both solvated and free water, thereby alleviating hydrogen evolution. Moreover, the coordinated anions and urea molecules facilitate the in-situ formation of an organic-inorganic hybrid protective layer on the metallic iron, establishing a physical barrier against water and promoting homogeneous interfacial reactions. This work demonstrates an appealing opportunity to design cost-effective and high-performance electrolytes and propels the practical application of iron metal-based energy storage devices.

Abstract licence: CC BY-NC-ND

Constructing photonic crystals with core-shell structured nanoparticles is an important means for applications such as secure communication, anti-counterfeiting marking, and structural color camouflage. Nonetheless, the precise synthesis technology for core-shell structured nanoparticles at the hundred-nanometer scale faces significant challenges. This paper proposes a controlled synthesis method for core-shell structured nanoparticles using a template method. By using 100 nm diameter silica nanospheres as templates and coating them with a ferroferric oxide shell layer, SiO2@Fe3O4 core-shell structured nanoparticles with regular morphology and good uniformity can be obtained. The study experimentally investigated the effects of feed amount, modifiers, temperature, and feed order on the coating effect, systematically optimizing the preparation process. Centrifugal driving technology was used to achieve structural colors in the visible wavelength range. Additionally, the method successfully created well-defined and uniform core-shell structured nanoparticles using 200 nm diameter silica nanospheres as templates, demonstrating that this controllable synthesis method can effectively produce core-shell structured nanoparticles over a wide range of particle sizes. The template method proposed in this paper can significantly improve morphological regularity and size uniformity while effectively reducing the preparation cost of core-shell structured nanoparticles.

Abstract licence: CC BY

Background:The static digestion/Caco-2 cell model has been widely employed as a bioassay to assess iron bioavailability.However, there are many methodological differences in how it is utilized.Thus, the feasibility of different chamber systems and iron treatment options were examined.Objective: To investigate iron bioavailability of INFOGEST digesta compared to supernatant in Caco-2 model with Glahn's dual chamber system (dialysis membrane), an alternative dual-chamber system (insert membrane), or a triple-chamber system (insert membrane + dialysis membrane).To determine the bioavailability of precooked corn flour fortified with ferric sodium ethylenediaminetetraacetate (NaFeEDTA), ferrous fumarate, ferrous sulfate (FeSO4) and their combinations.Methods: Precooked corn flour samples fortified with NaFeEDTA, ferrous fumarate, or FeSO4 were digested following the INFOGEST method.The iron solubility of supernatant was analyzed and Caco-2 cells were treated with iron digesta or supernatant in the dual-chamber or the triple-chamber systems for 2 hours, respectively.The ferritin concentrations were quantified to compare systems.Finally, the bioavailability of NaFeEDTA, ferrous fumarate, and FeSO4 combinations was measured using Glahn's dual-chamber system.Results: Iron solubility of NaFeEDTA was significantly higher than ferrous fumarate J o u r n a l P r e -p r o o f and FeSO4.The combinations of NaFeEDTA and fumarate/FeSO4 at the 4:9 weight ratio had significantly higher iron solubility than combinations of NaFeEDTA and fumarate/FeSO4 at the 2:11 weight ratio.Ferritin concentrations in the Glahn's dualchamber system were significantly higher than the alternative dual-chamber and the triple-chamber systems.The combinations of NaFeEDTA and FeSO4 at 2:11 weight ratio had significantly higher ferritin concentrations than the other combination samples. Conclusions:The Caco-2 cell model with Glahn's dual-chamber system and INFOGEST digesta was the best treatment and chamber system.NaFeEDTA had significantly higher bioavailability than FeSO4, but not ferrous fumarate.The combination of NaFeEDTA and FeSO4 at 2:11 weight ratio was the most promising iron treatment ratio.

Abstract licence: CC BY