Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience
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Probing the dynamics of nanoparticle formation from a precursor at atomic resolution

Probing the dynamics of nanoparticle formation from a precursor at atomic resolution | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Control of reduction kinetics and nucleation processes is key in materials synthesis. However, understanding of the reduction dynamics in the initial stages is limited by the difficulty of imaging chemical reactions at the atomic scale; the chemical precursors are prone to reduction by the electron beams needed to achieve atomic resolution. Here, we study the reduction of a solid-state Pt precursor compound in an aberration-corrected transmission electron microscope by combining low-dose and in situ imaging. The beam-sensitive Pt precursor, K2PtCl4, is imaged at atomic resolution, enabling determination of individual (K, Pt, Cl) atoms. The transformation to Pt nanoclusters is captured in real time, showing a three-stage reaction including the breaking of the ionic bond, formation of PtCl2, and the reduction of the dual-valent Pt to Pt metal. Deciphering the atomic-scale transformation of chemicals in real time using combined low-dose and in situ imaging brings new possibility to study reaction kinetics in general.
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Atomic- and Molecular-Resolution Mapping of Solid–Liquid Interfaces by 3D Atomic Force Microscopy

Atomic- and Molecular-Resolution Mapping of Solid–Liquid Interfaces by 3D Atomic Force Microscopy | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Atomic- and Molecular-Resolution Mapping of Solid–Liquid Interfaces by 3D Atomic Force Microscopy
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SUBSEA (Systematic Underwater Biogeochemical Science and Exploration Analog): NOAA Office of Ocean Exploration and Research

SUBSEA (Systematic Underwater Biogeochemical Science and Exploration Analog): NOAA Office of Ocean Exploration and Research | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
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Rational design of reconfigurable prismatic architected materials

Rational design of reconfigurable prismatic architected materials | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
A robust and scale-independent strategy for the design of reconfigurable architected materials (in which properties are adjusted by altering structure rather than composition) is described, based on space-filling assemblies of polyhedra.
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3D nanopetrography and chemical imaging of datable zircons by synchrotron multimodal X-ray tomography

3D nanopetrography and chemical imaging of datable zircons by synchrotron multimodal X-ray tomography | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
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Meet Oklo, the Earth’s Two-billion-year-old only Known Natural Nuclear Reactor | IAEA

Meet Oklo, the Earth’s Two-billion-year-old only Known Natural Nuclear Reactor | IAEA | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Physicist Francis Perrin sat at a nuclearfuel-processing plant down in the south of France, thinking to himself: “This cannot be possible.” It was 1972.
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Carbonate mineral forms diamond on its own

Carbonate mineral forms diamond on its own | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Formation of natural diamonds requires the reduction of carbon to its bare elemental form, and pressures ( P ) greater than 5 GPa to cross the graphite–diamond transition boundary. In a study of shocked ferromagnesian carbonate at the Xiuyan impact crater, we found that the impact pressure–temperature ( P-T ) of 25–45 GPa and 800–900 °C were sufficient to decompose ankerite Ca(Fe2+,Mg)(CO3)2 to form diamond in the absence of another reductant. The carbonate self-reduced to diamond by concurrent oxidation of Fe2+ to Fe3+ to form a high- P polymorph of magnesioferrite, MgFe3+2O4. Discovery of the subsolidus carbonate self-reduction mechanism indicates that diamonds could be ubiquitously present as a dominant host for carbon in the Earth’s lower mantle.
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Adsorption of Cs onto Biogenic Birnessite: Effects of Layer Structure, Ionic Strength, and Competition Cations

Adsorption of Cs onto Biogenic Birnessite: Effects of Layer Structure, Ionic Strength, and Competition Cations | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
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The adsorption behavior of Cs over a wide range of concentrations (1 × 10–10 to 0.1 mol/L) was carefully examined via solution chemistry and X-ray absorption fine structure techniques.
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The Fate of Lipid Biosignatures in a Mars-Analogue Sulfur Stream

The Fate of Lipid Biosignatures in a Mars-Analogue Sulfur Stream | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Guidance for investigating late Noachian and early Hesperian rocks is provided by studies of analogous acidic and sulfur-rich environments on Earth.
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Characterization of Lead Uptake by Nano-Sized Hydroxyapatite: A Molecular Scale Perspective

Characterization of Lead Uptake by Nano-Sized Hydroxyapatite: A Molecular Scale Perspective | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Sequestration of toxic metals (e.g., Pb) by hydroxyapatite (HAP) has attracted wide attention in soil remediation. In this study, a comprehensive investigation on Pb uptake by HAP was conducted using combined batch method, X-ray diffraction (XRD), Fourier-transform infrared, and high-resolution transmission electron microscopy (HRTEM).


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Structure-Dependent Dissolution and Restructuring of Calcite Surfaces by Organophosphonates

Structure-Dependent Dissolution and Restructuring of Calcite Surfaces by Organophosphonates | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
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For all of the molecules, the restructuring process of calcite (10.4) is qualitatively independent of the pH of the solution and, therefore, independent of the protonation/deprotonation states of the molecules.
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A large planetary body inferred from diamond inclusions in a ureilite meteorite

A large planetary body inferred from diamond inclusions in a ureilite meteorite | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
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The authors studied a section of the Almahata Sitta ureilite using transmission electron microscopy, where large diamonds were formed at high pressure inside the parent body.
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Wollastonite Blizzard Within Glass | Gems & Gemology

Wollastonite Blizzard Within Glass | Gems & Gemology | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Beads believed to be synthetic quartz are discovered to be glass with a surprising set of inclusions.
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Biogenic Cyanide Production Promotes Dissolution of Gold Nanoparticles in Soil

Biogenic Cyanide Production Promotes Dissolution of Gold Nanoparticles in Soil | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Biogenic Cyanide Production Promotes Dissolution of Gold Nanoparticles in Soil
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Micro- and Nanoscale Identification of Rare Earth Element–Mineral Associations in an Acidified Dredge Spoil

Micro- and Nanoscale Identification of Rare Earth Element–Mineral Associations in an Acidified Dredge Spoil | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Micro- and Nanoscale Identification of Rare Earth Element–Mineral Associations in an Acidified Dredge Spoil and Adjacent Reduced Sediments
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In Situ Real-Time Study on Dynamics of Microbially Induced Calcium Carbonate Precipitation at a Single-Cell Level

In Situ Real-Time Study on Dynamics of Microbially Induced Calcium Carbonate Precipitation at a Single-Cell Level | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
In Situ Real-Time Study on Dynamics of Microbially Induced Calcium Carbonate Precipitation at a Single-Cell Level
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Naica’s Giant Crystals: Deterioration Scenarios

Naica’s Giant Crystals: Deterioration Scenarios | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Naica’s Giant Crystals: Deterioration Scenarios
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Geobiology reveals how human kidney stones dissolve in vivo

Geobiology reveals how human kidney stones dissolve in vivo | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
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Blue boron-bearing diamonds from Earth’s lower mantle

Blue boron-bearing diamonds from Earth’s lower mantle | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Mineral inclusions in blue boron-bearing diamonds reveal that such diamonds are among the deepest diamonds ever found and indicate a viable pathway for the deep-mantle recycling of crustal elements.
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Nobler than the Noblest: Noncubic Gold Microcrystallites

Nobler than the Noblest: Noncubic Gold Microcrystallites | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
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The authors report a combined experimental and theoretical investigation of the stability of Au microcrystallites bearing unconventional crystal lattices that exhibit enhanced stability towards Hg and aqua regia and practically no interaction with Cu during electroless plating. The unconventional gold is undoubtedly nobler; see also: http://www.x-mol.com/paper/687915
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Iron Vacancies Accommodate Uranyl Incorporation into Hematite

Iron Vacancies Accommodate Uranyl Incorporation into Hematite | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Radiotoxic uranium contamination in natural systems and nuclear waste containment can be sequestered by incorporation into naturally abundant iron (oxyhydr)oxides such as hematite (α-Fe2O3) during mineral growth.
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Size and Morphology Controlled Synthesis of Boehmite Nanoplates and Crystal Growth Mechanisms

Size and Morphology Controlled Synthesis of Boehmite Nanoplates and Crystal Growth Mechanisms | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
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The size and morphology of the boehmite nanoplates was systematically varied between hexagonal and rhombic by adjusting precursor concentrations, pH, and the synthesis temperature, due to face-specific effects. The transformation mechanism is consistent with dissolution and reprecipitation, and involves transitory initial appearance of metastable gibbsite that is later consumed upon nucleation of boehmite.
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Magnetite and Green Rust: Synthesis, Properties, and Environmental Applications of Mixed-Valent Iron Minerals

Magnetite and Green Rust: Synthesis, Properties, and Environmental Applications of Mixed-Valent Iron Minerals | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Mixed-valent iron [Fe(II)-Fe(III)] minerals such as magnetite and green rust have received a significant amount of attention over recent decades, especially in the environmental sciences.
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Fractal-like hierarchical organization of bone begins at the nanoscale

Fractal-like hierarchical organization of bone begins at the nanoscale | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
On larger length scales, bone is known to have a hierarchical structure in which small crystals of calcium phosphates arrange themselves around helices of collagen. These make up larger structures, such as the osteons found in compact bone. However, at smaller lengths, does the hierarchical structure persist? By combining three-dimensional electron tomography with two-dimensional electron microscopy, Reznikov et al. observed structural ordering from the nanoscale upward. At the smallest scale, needle-shaped mineral units form platelets that organize into stacks bridging multiple collagen units.

Science , this issue p. [eaao2189][1]

[1]: /lookup/doi/10.1126/science.aao2189
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The tremendous potential of deep-sea mud as a source of rare-earth elements

The tremendous potential of deep-sea mud as a source of rare-earth elements | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Deep-sea mud containing over 5,000 ppm total REY content was discovered in the western North Pacific Ocean near Minamitorishima Island, Japan, in 2013. This REY-rich mud has great potential as a rare-earth metal resource because of the enormous amount available and its advantageous mineralogical features.
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