8 results match your criteria Acs Earth And Space Chemistry[Journal]

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A Polyextreme Hydrothermal System Controlled by Iron: The Case of Dallol at the Afar Triangle.

ACS Earth Space Chem 2019 Jan 6;3(1):90-99. Epub 2018 Dec 6.

Unidad Asociada UVa-CSIC al Centro de Astrobiología, University of Valladolid, 47002 Valladolid, Spain.

One of the latest volcanic features of the Erta Ale range at the Afar Triangle (NE Ethiopia) has created a polyextreme hydrothermal system located at the Danakil depression on top of a protovolcano known as the dome of Dallol. The interaction of the underlying basaltic magma with the evaporitic salts of the Danakil depression has generated a unique, high-temperature (108 °C), hypersaline (NaCl supersaturated), hyperacidic (pH values from 0.1 to -1. Read More

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http://dx.doi.org/10.1021/acsearthspacechem.8b00141DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6380227PMC
January 2019
1 Read

Carbonate Adsorption to Ferrihydrite: Competitive Interaction with Phosphate for Use in Soil Systems.

ACS Earth Space Chem 2019 Jan 3;3(1):129-141. Epub 2018 Dec 3.

Soil Chemistry and Chemical Soil Quality Group, Wageningen University, 6708 PB, Wageningen, The Netherlands.

Carbonate (CO) interacts with Fe-(hydr)oxide nanoparticles, affecting the availability and geochemical cycle of other important oxyanions in nature. Here, we studied the carbonate-phosphate interaction in closed systems with freshly prepared ferrihydrite (Fh), using batch experiments that cover a wide range of pH values, ionic strength, and CO and PO concentrations. The surface speciation of CO has been assessed by interpreting the ion competition with the Charge Distribution (CD) model, using CD coefficients derived from MO/DTF optimized geometries. Read More

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http://dx.doi.org/10.1021/acsearthspacechem.8b00160DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6369681PMC
January 2019

In Situ Nanoscale Investigation of Step Retreat on Fluoranthene Crystal Surfaces.

ACS Earth Space Chem 2018 Dec 2;2(12):1301-1311. Epub 2018 Nov 2.

Leiden Observatory, Faculty of Science, Leiden University, 2300 RA Leiden, The Netherlands.

Fluoranthene, a polycyclic aromatic hydrocarbon, has been detected on Earth as well as in asteroids and meteorites and may have played a role in the formation of life. Increasing the ionic strength of aqueous solutions has been observed to lower the fluoranthene solubility, but it is unclear how solution composition controls the release rate of fluoranthene to an aqueous solution. To elucidate this, we performed in situ atomic force microscopy experiments in which we characterized the sublimation and dissolution behavior of fluoranthene crystal surfaces. Read More

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http://pubs.acs.org/doi/10.1021/acsearthspacechem.8b00120
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http://dx.doi.org/10.1021/acsearthspacechem.8b00120DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6326534PMC
December 2018
6 Reads

NO Suppression of Autoxidation-Inhibition of Gas-Phase Highly Oxidized Dimer Product Formation.

Authors:
Matti P Rissanen

ACS Earth Space Chem 2018 Nov 12;2(11):1211-1219. Epub 2018 Oct 12.

Institute for Atmospheric and Earth System Research (INAR), University of Helsinki, Helsinki, Finland.

Atmospheric autoxidation of volatile organic compounds (VOC) leads to prompt formation of highly oxidized multifunctional compounds (HOM) that have been found crucial in forming ambient secondary organic aerosol (SOA). As a radical chain reaction mediated by oxidized peroxy (RO) and alkoxy (RO) radical intermediates, the formation pathways can be intercepted by suitable reaction partners, preventing the production of the highest oxidized reaction products, and thus the formation of the most condensable material. Commonly, NO is expected to have a detrimental effect on RO chemistry, and thus on autoxidation, whereas the influence of NO is mostly neglected. Read More

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http://pubs.acs.org/doi/10.1021/acsearthspacechem.8b00123
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http://dx.doi.org/10.1021/acsearthspacechem.8b00123DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6251564PMC
November 2018
17 Reads

Impact of Intrinsic Structural Properties on the Hydration of 2:1 Layer Silicates.

ACS Earth Space Chem 2017 Dec 3;1(10):608-620. Epub 2017 Oct 3.

Competence Center for Material Moisture, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.

Several 2:1 layer silicates comprising di- and trioctahedral smectites of different layer charge between 0.2 and 0.4 per formula unit and a trioctahedral vermiculite were studied by an method that allowed Fourier transform infrared spectroscopy (FTIR) spectra and water vapor sorption isotherms to be obtained simultaneously. Read More

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http://dx.doi.org/10.1021/acsearthspacechem.7b00091DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5896019PMC
December 2017
5 Reads

Reaction Kinetics of CaOH with H and O and OCaOH with O: Implications for the Atmospheric Chemistry of Meteoric Calcium.

ACS Earth Space Chem 2017 Sep 14;1(7):431-441. Epub 2017 Jul 14.

School of Chemistry, University of Leeds, Leeds LS2 9JT, United Kingdom.

The ablation of cosmic dust particles entering the Earth's upper atmosphere produces a layer of Ca atoms around 90 km. Here, we present a set of kinetic experiments designed to understand the nature of the Ca molecular reservoirs on the underside of the layer. CaOH was produced by laser ablation of a Ca target in the fast flow tube and detected by non-resonant laser-induced fluorescence, probing the D(Σ) ← X(Σ) transition at 346. Read More

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http://dx.doi.org/10.1021/acsearthspacechem.7b00072DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5611678PMC
September 2017
3 Reads

Cation Exchange in the Presence of Oil in Porous Media.

ACS Earth Space Chem 2017 Apr 16;1(2):101-112. Epub 2017 Mar 16.

Delft University of Technology, 2628 CD Delft, The Netherlands.

Cation exchange is an interfacial process during which cations on a clay surface are replaced by other cations. This study investigates the effect of oil type and composition on cation exchange on rock surfaces, relevant for a variety of oil-recovery processes. We perform experiments in which brine with a different composition than that of the in situ brine is injected into cores with and without remaining oil saturation. Read More

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http://dx.doi.org/10.1021/acsearthspacechem.6b00015DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5448445PMC
April 2017
24 Reads

Mineral Surface Rearrangement at High Temperatures: Implications for Extraterrestrial Mineral Grain Reactivity.

ACS Earth Space Chem 2017 Apr 31;1(2):113-121. Epub 2017 Mar 31.

Institut für Mineralogie, University of Münster, Corrensstrasse 24, 48149 Münster, Germany.

Mineral surfaces play a critical role in the solar nebula as a catalytic surface for chemical reactions and potentially acted as a source of water during Earth's accretion by the adsorption of water molecules to the surface of interplanetary dust particles. However, nothing is known about how mineral surfaces respond to short-lived thermal fluctuations that are below the melting temperature of the mineral. Here we show that mineral surfaces react and rearrange within minutes to changes in their local environment despite being far below their melting temperature. Read More

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http://dx.doi.org/10.1021/acsearthspacechem.6b00016DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5407656PMC
April 2017
2 Reads
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