Results 1 to 10 of about 26 (25)
Atomic-scale studies of Fe3O4(001) and TiO2(110) surfaces following immersion in CO2-acidified water [PDF]
Chemphyschem 21, 1788 (2020), 2021 Difficulties associated with the integration of liquids into a UHV environment make surface-science style studies of mineral dissolution particularly challenging. Recently, we developed a novel experimental setup for the UHV-compatible dosing of ultrapure liquid water, and studied its interaction with TiO2 and Fe3O4 surfaces. Here, we describe a simple
arxiv +1 more source
Electrolytic Conversion of Bicarbonate into CO in a Flow Cell [PDF]
Joule 2019, 3, 1487-1497, 2019 Electrochemical CO2 reduction offers a method to use renewable electricity to convert CO2 into CO and other carbon-based chemical building blocks. While nearly all studies rely on a CO2 feed, we show herein that aqueous bicarbonate solutions can also be electrochemically converted into CO gas at meaningful rates in a flow cell.
arxiv +1 more source
Carbon Dioxide, Bicarbonate and Carbonate Ions in Aqueous Solutions at Deep Earth Conditions [PDF]
, 2020 We investigate the effect of pressure, temperature and acidity on the composition of water-rich carbon-bearing fluids at thermodynamic conditions that correspond to the Earth's deep Crust and Upper Mantle. Our first-principles molecular dynamics simulations provide mechanistic insight into the hydration shell of carbon dioxide, bicarbonate and ...
arxiv +1 more source
Agglomeration Drives the Reversed Fractionation of Aqueous Carbonate and Bicarbonate at the Air-water Interface [PDF]
arXiv, 2023 In the course of our investigations of the adsorption of ions to the air-water interface, we previously reported the surprising result that doubly-charged carbonate anions exhibit a stronger surface affinity than do singly-charged bicarbonate anions. In contrast to monovalent, weakly hydrated anions, which generally show enhanced concentrations in the ...
arxiv
Potential Global Sequestration of Atmospheric Carbon Dioxide by Semi-Arid Forestation [PDF]
arXiv, 2022 Carbon sequestration was studied in the planted Israeli Yatir forest, a 28 ${km}^2$ Aleppo pine forest growing at the semi-arid timberline (with no irrigation or fertilization). The organic carbon sequestration rate (above and below ground) was measured as 550 gram $CO_2 {m}^{-2} {yr}^{-1}$, by Eddy Covariance flux and Carbon Stock counting methods ...
arxiv
Di-chromatic Interpolation of Magnetic Resonance Metabolic Imagery [PDF]
Magnetic Resonance Materials in Physics, Biology and Medicine
(2021): 1-16, 2020 Magnetic resonance imaging with hyperpolarized contrast agents can provide unprecedented \textit{in-vivo} measurements of metabolism, but yields images that are lower resolution than that achieved with proton anatomical imaging. In order to spatially localize the metabolic activity, the metabolic image must be interpolated to the size of the proton ...
arxiv +1 more source
Fabrication of sub-15nm aluminum wires by controlled etching [PDF]
Appl. Phys. Lett. 104, 173101 (2014), 2014 We describe a method for fabrication of uniform aluminum nanowires with diameters below 15 nm. Electron beam lithography is used to define narrow wires, which are then etched using a sodium bicarbonate solution, while their resistance is simultaneously measured in-situ.
arxiv +1 more source
The fate of carbon dioxide in water-rich fluids at extreme conditions [PDF]
Science Advances 2, e1601278 (2016), 2016 Investigating the fate of dissolved carbon dioxide under extreme conditions is critical to understanding the deep carbon cycle in the Earth, a process that ultimately influences global climate change. We used first-principles molecular dynamics simulations to study carbonates and carbon dioxide dissolved in water at pressures (P) and temperatures (T ...
arxiv +1 more source
A Metabolite Specific 3D Stack-of-Spiral bSSFP Sequence for Improved Lactate Imaging in Hyperpolarized [1-$^{13}$C]Pyruvate Studies on a 3T Clinical Scanner [PDF]
Magn Reson Med. 2020; 84: 1113-1125, 2020 Purpose: The balanced steady-state free precession sequence has been previously explored to improve the efficient use of non-recoverable hyperpolarized $^{13}$C magnetization, but suffers from poor spectral selectivity and long acquisition time. The purpose of this study was to develop a novel metabolite-specific 3D bSSFP ("MS-3DSSFP") sequence with ...
arxiv +1 more source
Large presence of carbonic acid in CO$_2$-rich aqueous fluids under Earth's mantle conditions [PDF]
Journal of Physical Chemistry Letters 10, 5135-5141 (2019), 2019 The chemistry of carbon in aqueous fluids at extreme pressure and temperature conditions is of great importance to Earth's deep carbon cycle, which substantially affects the carbon budget at Earth's surface and global climate change. At ambient conditions, the concentration of carbonic acid in water is negligible, so aqueous carbonic acid was simply ...
arxiv +1 more source