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20 results for “hematite”
Dataset of "Photoelectrochemical generation of H2O2 using hematite (α-Fe2O3) and gas diffusion electrode (GDE)"
<p>In contrast to the industrial-scale production of H2O2 the electrochemical or photoelectrochemical synthesis is environmentally friendly. In the present work, <br>the photoelectrochemical generation of H2O2 was studied by combining the hematite (α-Fe2O3/FTO/glass) photoanode and gas diffusion electrode (GDE) modified by <br>incorporation of tin (II) phthalocyanine (SnPc) in its hydrophilic layer. The experiments were carried out in a photoelectrochemical cell with two compartments <br>separated by a proton exchange membrane under applied bias and AM1.5 irradiation (100 mW/cm2). The generated amount of H2O2 was determined by chemical analysis <br>(visible light spectrophotometry) of the electrolyte. As a tool to determine the efficiency of such a process, the Faradaic efficiency (FE) was calculated. The <br>best configuration used air as an inlet gas for GDE and phosphate buffer (pH 6.4) as an electrolyte in the cathodic compartment. The combination of hematite and <br>GDE (with SnPc) was the most effective in H2O2 photoelectrochemical generation. The highest value of FE was 52.4 % for GDE (O2 reduction to H2O2) and 0.4 % for <br>hematite photoanode (H2O oxidation to H2O2).</p>
Spin wave dispersion of ultra-low damping hematite (α-Fe2O3) at GHz frequencies
<p>Raw data associated to the manuscript ‘’Spin wave dispersion of ultra-low damping hematite (α-Fe<sub>2</sub>O<sub>3</sub>) at GHz frequencies‘’,</p> <p>Physical Review Materials 7, 054407(2023); doi: 10.1103/PhysRevMaterials.7.054407<br> Information about file formats and measurement parameters are described in text files in the specific folders.</p> <p>Paper abstract:<br> Low magnetic damping and high group velocity of spin waves (SWs) or magnons are two crucial parameters for functional magnonic devices. Magnonics research on signal processing and wave-based computation at GHz frequencies focused on the artificial ferrimagnetic garnet Y<sub>3</sub>Fe<sub>5</sub>O<sub>12</sub> (YIG) so far. We report on spin-wave spectroscopy studies performed on the natural mineral hematite (α-Fe<sub>2</sub>O<sub>3</sub>) which is a canted antiferromagnet. By means of broadband GHz spectroscopy and inelastic light scattering, we determine a damping coefficient of 1.1×10<sup>−5</sup> and magnon group velocities of a few 10 km/s, respectively, at room temperature. Covering a large regime of wave vectors up to k≈24 rad/μm, we find the exchange stiffness length to be relatively short and only about 1 Å. In a small magnetic field of 30 mT, the decay length of SWs is estimated to be 1.1 cm similar to the best YIG. Still, inelastic light scattering provides surprisingly broad and partly asymmetric resonance peaks. Their characteristic shape is induced by the large group velocities, low damping and distribution of incident angles inside the laser beam. Our results promote hematite as an alternative and sustainable basis for magnonic devices with fast speeds and low losses based on a stable natural mineral.</p>
Data for "Improved constraints on hematite refractive index for estimating climatic effects of dust aerosols"
<p>This repository contains calculated/simulated data on the imaginary part of the complex refractive index, single scattering albedo, and/or optical depth for dust aerosols in the visible band or at the wavelength of 550 nm.</p> <p>For detailed information on (1) the acquisition and utilization of this data, (2) comprehensive configurations for model simulations, (3) the principal findings, and (4) the methodology employed to achieve these findings, please refer to the article authored by Li, Mahowald et al. (2024; Commun. Earth Environ).</p> <p>Other datasets, including the code and laboratory observations presented in the paper, can be found elsewhere (refer to the Data and Code Availability sections of the paper).</p> <p>For any clarification regarding the data and code, inquiries related to the publication, or potential collaboration, please contact Longlei Li (<a href="mailto:ll859@cornell.edu">ll859@cornell.edu</a>) or Natalie M. Mahowald (<a href="mailto:mahowald@cornell.edu">mahowald@cornell.edu</a>).</p>
Molecular Models of hematite, goethite, kaolinite, and quartz surfaces
<p>Molecular models for hematite, quartz, goethite and kaolinite surfaces according to different terminations.</p>
Hematite Plummet
Drilled Hematite Plummet Poverty Point Period Found in Tensas Parish, Louisiana Source: Objaverse 1.0 / Sketchfab
Unexpected magnetic behavior of natural hematite-bearing rocks at low temperatures
<p>This data set contains the underlying data for Abrajevitch, A., Roberts, A.P., Pillans, B. J., Hori, R.S. Unexpected magnetic behavior of natural hematite-bearing rocks at low temperatures. Geochemistry, Geophysics, Geosystems, DOI: 10.1029/2021GC010094</p> <p> </p>
Formation of Hematite Spherules from Metallic Spherules by Oxidative Hydrothermal Alteration: Implications for Hematite Spherules on Martian Surface
<p>Figures used in paper “Formation of Hematite Spherules from Metallic Spherules by Oxidative Hydrothermal Alteration: Implications for Hematite Spherules on Martian Surface”</p>
Importance of hematite self-reversal in Al-rich soils magnetostratigraphy: Revisiting the Damei red soil sequence in the Bose Basin, southern China
<p>This is the data of the article titled "<strong>Importance of hematite self-reversal in Al-rich soils magnetostratigraphy: Revisiting the Damei red soil sequence in the Bose Basin, southern China</strong>" which submitted for publication to JGR-Solid Earth under the reference # 2021JB023165</p>
Data for the article "Exceptional sign changes of the nonlocal spin Seebeck effect in antiferromagnetic hematite"
<p>Data for the article "Exceptional sign changes of the nonlocal spin Seebeck effect in antiferromagnetic hematite"<a href="https://journals.aps.org/prb/abstract/10.1103/PhysRevB.103.224433">(https://journals.aps.org/prb/abstract/10.1103/PhysRevB.103.224433</a> and <a href="https://arxiv.org/abs/2105.13653">https://arxiv.org/abs/2105.13653</a>)</p>
PollyXT and COSMO-MUSCAT data for "Investigating the link between mineral dust hematite content and intensive optical properties by means of lidar measurements and aerosol modelling"
<p>The dataset contains 4 different files: </p> <ul> <li>For the single case example on the 24 August 2021 between 2:45 to 5:27 UTC in Mndelo, Cabo Verde: <ul> <li>-Mindelo-PollyXT_CPV-20210824_0245-0527-77smooth-info.txt : contains the information of the vertically retrieved optical properties from PollyXT lidar measurements. The information contained refers to the chosen retrieval times, vertical smoothing, and reference heights</li> <li>-Mindelo-PollyXT_CPV-20210824_0245-0527-77smooth.txt : vertically retrieved optical properties per height.</li> <li>-Mindelo-model_24aug.csv : COSMO-MUSCAT vertical results of dust and mineral mass concentrations per height. The columns that end with "int mass" correspond to the integrated mass per dust layer and columns that end with numbers correspond to different size bins. For reference to the size bins see Table 1 in Gómez Maqueo Anaya et al., 2024</li> </ul> </li> <li>Mutiple case studies: <ul> <li>-Mindelo-lidar-uvvisdiff_model.csv : Twenty-two case studies with the following order: first, the mean values of the lidar-derived optical properties, along with their corresponding retrieval times and heights that define the dust plume. This is followed by the POLIPHON (Mamouri and Ansmann, 2014, 2017) data. The mean values from dust and mineral mass concentrations from the model start with the model heights where the dust plumes were calculated. At the end of the dataset rows, the times from which the modeled mean values are calculated can be found.</li> </ul> </li> </ul>
FR057, Late Archaic, Drilled Hematite
Drilled Hematite Late Archaic Glacial Kame Catalog #: P440 Uploaded by Gwyneth Harris Suggested Data Citation: Thompson, Christine, Erin Powers, Gwyneth Harris, and Kevin C. Nolan, 2021. FRHS_FR057, 3D Model .ply file. Digital Exhibit of Fort Recovery Historical Society's Precontact Collection, Fort Recovery Historical Society and Applied Anthropology Laboratories, Ball State University. Source: Objaverse 1.0 / Sketchfab
Kinetics of Photoelectrochemical Oxidation of Methanol on Hematite Photoanodes
<p>The kinetics of photoelectrochemical (PEC) oxidation of methanol, as a model organic substrate, on α-Fe<sub>2</sub>O<sub>3</sub> photoanodes are studied using photoinduced absorption spectroscopy and transient photocurrent measurements. Methanol is oxidized on α-Fe<sub>2</sub>O<sub>3</sub> to formaldehyde with near unity Faradaic efficiency. A rate law analysis under quasi-steady-state conditions of PEC methanol oxidation indicates that rate of reaction is second order in the density of surface holes on hematite and independent of the applied potential. Analogous data on anatase TiO<sub>2</sub> photoanodes indicate similar second-order kinetics for methanol oxidation with a second-order rate constant 2 orders of magnitude higher than that on α-Fe<sub>2</sub>O<sub>3</sub>. Kinetic isotope effect studies determine that the rate constant for methanol oxidation on α-Fe<sub>2</sub>O<sub>3</sub> is retarded ∼20-fold by H/D substitution. Employing these data, we propose a mechanism for methanol oxidation under 1 sun irradiation on these metal oxide surfaces and discuss the implications for the efficient PEC methanol oxidation to formaldehyde and concomitant hydrogen evolution.</p>
dave-heslop74/Roberts-Hematite-FORCs: Roberts-Hematite-FORCs raw data release
<p>No description provided.</p>
Multihole water oxidation catalysis on hematite photoanodes revealed by operando spectroelectrochemistry and density functional theory
<p>Water oxidation is the key kinetic bottleneck of photoelectrochemical devices for fuel synthesis. Despite advances in the identification of intermediates, elucidating the catalytic mechanism of this multi-redox reaction on metal-oxide photoanodes remains a significant experimental and theoretical challenge. Here we report an experimental analysis of water oxidation kinetics on four widely studied metal oxides, focusing particularly upon hematite. We observe that hematite is able to access a reaction mechanism third order in surface hole density, assigned to equilibration between three surface holes and M(OH)-O-M(OH) sites. This reaction exhibits a remarkably low activation energy (E<sub>a</sub> ~ 60 meV). Density functional theory is employed to determine the energetics of charge accumulation and O-O bond formation on a model hematite 110 surface. The proposed mechanism shows parallels with the function of oxygen evolving complex of photosystem II, and provides new insights to the mechanism of heterogeneous water oxidation on a metal oxide surface.</p>
Original waveforms for hematite measurements under high pressure
<p>Original waveforms for hematite measurements</p>
Data from: Enhanced specific loss power of hematite-chitosan nanohybrid synthesized by hydrothermal method
<p>We used a hydrothermal technique for producing hematite (a-Fe2O3) nanoparticles that were then functionalized with chitosan. The prepared iron oxide (a-Fe2O3) nanoparticles were single-phase, according to XRD analysis. The presence of lattice fringes in the HRTEM image confirmed the crystalline nature of the a-Fe2O3. The samples were coated with chitosan and the coating was confirmed by the spectra of Fourier transform infrared (FTIR) analysis. The Mössbauer spectra reveal a mixed relaxation state, which is also supported by the PPMS study. A zero field cooled study revealed the existence of a Morin transition. The hydrodynamic diameter of the coated particles was measured using the dynamic light scattering technique (DLS) to be between 218 and 235 nm, with a polydispersity index ranging from 0.048 to 0.119. The zeta potential was +46.8 mV, which is appropriate for colloidal stability. Both the Vero and HeLa cell lines demonstrated viability incubated for 24 hrs. with the colloids of different concentrations. The maximum temperature, Tmax attained by the hematite-chitosan nanohybrid solution of 0.25 and 4 mg/ml — the lowest and highest concentration, was 42.9 and 48.3ºC, and the specific loss power, SLP was 501.6 and 35.53, which are remarkably high for the Mmax; 300K = 1.98 emu/g.</p>
Data from: Enhanced specific loss power of hematite-chitosan nanohybrid synthesized by hydrothermal method
Open the record for dataset details and reuse information.
hematite parameters variation with cation substitution and grain size
<p> Most of the data were digitized from the original studies. the related references are marked in the files.</p>
FR034, Late Archaic, Drilled Pebble Hematite
Drilled Pebble Pendant Hematite Late Archaic Uploaded by Carson Wright Suggested Data Citation: Thompson, Christine, Erin Powers, Carson Wright, and Kevin C. Nolan, 2021. FRHS_FR034, 3D Model .ply file. Digital Exhibit of Fort Recovery Historical Society's Precontact Collection, Fort Recovery Historical Society and Applied Anthropology Laboratories, Ball State University. Not exported as a watertight model. Source: Objaverse 1.0 / Sketchfab
Hematit
Hematit Hematite Source: Objaverse 1.0 / Sketchfab
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