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Liquid Exfoliation of Layered Materials

Liquid Exfoliation of Layered Materials | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Ath Godelitsas's insight:

Layered materials consist of two-dimensional platelets weakly stacked to form three-dimensional structures. The archetypal example is graphite, which consists of stacked graphene monolayers. However, there are many others: from MoS2 and layered clays to more exotic examples such as MoO3, GaTe, and Bi2Se3.

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Arsenic: Environmental Geochemistry, Mineralogy, and Microbiology

Arsenic: Environmental Geochemistry, Mineralogy, and Microbiology | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
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Cd(II) Sorption on Montmorillonite-Humic acid-Bacteria Composites

Cd(II) Sorption on Montmorillonite-Humic acid-Bacteria Composites | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Soil components (e.g., clays, bacteria and humic substances) are known to produce mineral-organic composites in natural systems.
Ath Godelitsas's insight:

Large positive entropies (68.1 ~ 114.4 J/mol/K), and linear combination fitting of the EXAFS spectra for Cd adsorbed onto Mont-bacteria and Mont-HA-bacteria composites, demonstrate that Cd is mostly bound to bacterial surface functional groups by forming inner-sphere complexes.

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Pathways for nitrogen cycling in Earth’s crust and upper mantle: A review and new results for microporous beryl and cordierite

Pathways for nitrogen cycling in Earth’s crust and upper mantle: A review and new results for microporous beryl and cordierite | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Ath Godelitsas's insight:

Building on their discussion of N behavior in continental crust, the authors present new measurements on the N concentrations and isotopic compositions of microporous beryl and cordierite from medium- and high-grade metamorphic rocks and pegmatites, both phases containing molecular N2, and NH4+-bearing micas coexisting with them.

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A spin on lower mantle mineralogy

A spin on lower mantle mineralogy | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it

© 2016 Mineralogical Society of America A spin on lower mantle mineralogy Jeffrey S.

Ath Godelitsas's insight:

In the October 2015 issue of American Mineralogist, Dorfman et al. present an experimental study of the effect of iron concentration on the spin transition in bridgmanite.

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Enhancing the rate of ex situ mineral carbonation in dunites via ball milling

Enhancing the rate of ex situ mineral carbonation in dunites via ball milling | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it

The optimum conditions are 12 h of BM with 50 wt% ethanol as process control agent.

Ath Godelitsas's insight:

The investigation of potential options for CO2 sequestration is of vital importance for alleviating the ongoing climate problem. This paper presents an efficient method for enhancing the ex situ carbonation of dunites. The ball milling process was applied to a dunite from the Troodos ophiolite (Cyprus), in order to create a new type of material with enhanced CO2 uptake. Through CO2 chemisorption followed by temperature-programmed desorption (CO2-TPD) experiments, optimum ball milling conditions were found (12 h of wet ball milling with 50 wt% ethanol as process control agent), leading to an increase of CO2 uptake of dunite by a factor of 6.9. A further increase of CO2 uptake by 10% was accomplished after 4 h of additional ball milling with smaller balls. Additionally, CO2-TPD along with in situ DRIFTS studies indicated that the CO2 uptake of the dunitic materials can be substantially enhanced by the presence of H2O during CO2 chemisorption. The positive effect of H2O on CO2 chemisorption becomes much more evident after the ball milling process. Specifically, the CO2 uptake of the ball-milled sample (BM45) was enhanced by a factor of 5.8 (from 181.9 to 1047.5 μmol g−1), when CO2 chemisorption was performed in the presence of 20 vol% H2O.

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Direct observation of mineral-organic composite formation reveals occlusion mechanism

Direct observation of mineral-organic composite formation reveals occlusion mechanism | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Ath Godelitsas's insight:

By investigating micelle incorporation in calcite with in-situ atomic force microscopy (AFM) and micromechanical simulations, the authors show that different mechanisms govern nanoscale occlusion.

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Geochemical reaction kinetics using nanometer-sized metal-hydroxide and -oxide ions (GEOC62) by William Casey

Geochemical reaction kinetics using nanometer-sized metal-hydroxide and -oxide ions (GEOC62) by William Casey | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
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Visualizing atoms of perovskite crystals

Visualizing atoms of perovskite crystals | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Ath Godelitsas's insight:

See also: http://www.sciencedaily.com/releases/2016/01/160108134326.htm

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Materials Scientists Make Martian Concrete | MIT Technology Review

Materials Scientists Make Martian Concrete | MIT Technology Review | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
If we’re going to colonize Mars, we’ll need buildings to live and work in. So researchers have made cheap, strong concrete out of “Martian” soil.
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Decrease in coccolithophore calcification and CO2 since the middle Miocene

Decrease in coccolithophore calcification and CO2 since the middle Miocene | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Ath Godelitsas's insight:

This paper relates degree of coccolith calcification to cellular calcification, and presents the first records of size-normalized coccolith thickness spanning the last 14 Myr from tropical oceans.

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Life's Rocky Start | NOVA

What is the secret link between rocks and minerals, and every living thing on Earth? Airing January 13, 2016 at 9 pm on PBS NOVA Facebook: https://www.facebo...
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Early Archaean tectonics and mantle redox recorded in Witwatersrand diamonds

Early Archaean tectonics and mantle redox recorded in Witwatersrand diamonds | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Ath Godelitsas's insight:

The authors have analysed the nitrogen abundance, as well as the nitrogen and carbon isotopic signatures of Archaean placer diamonds from the Kaapvaal craton, South Africa, which formed in the upper mantle 3.1 to 3.5 billion years ago.

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Zinc Isotope Fractionation as an Indicator of Geochemical Attenuation Processes

Zinc Isotope Fractionation as an Indicator of Geochemical Attenuation Processes | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Ath Godelitsas's insight:

Isotope measurements confirmed an increasing trend in aqueous δ66Zn in solution during sphalerite (ZnS) formation, but a decreasing trend in δ66Zn during the precipitation of hydrozincite [Zn5(CO3)2(OH)6] and hopeite [Zn3(PO4)2·4H2O]. In contrast, time-dependent sorption of Zn onto ferrihydrite at a fixed pH did not cause isotopic fractionation in the solution over the duration of the experiments.

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Porphyry copper enrichment linked to excess aluminium in plagioclase

Porphyry copper enrichment linked to excess aluminium in plagioclase | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Porphyry ore deposits are increasingly hard to discover. Geochemical analysis of minerals formed in porphyry systems worldwide shows that the most fertile deposits are associated with excess Al and water-rich magma injections.
Ath Godelitsas's insight:

The authors show that plagioclase from fertile systems is distinct in containing ‘excess’ aluminium.

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Bristol University | News | January: EAG awards

Bristol University | News | January: EAG awards | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it

Bristol dominates international geochemistry awards - Dr Kate Hendry and Professor Jon Blundy – both members of... https://t.co/ZR6iCdwP3Y

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Urey Award of European Association of Geochemistry to Professor Klaus Mezger

Urey Award of European Association of Geochemistry to Professor Klaus Mezger | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it

Klaus Mezger is a professor of Isotope Geology in the Department of Geological Sciences, University of Bern, Switzerland. His early research focused on the study of metamorphic processes in crustal rocks to understand their evolution as a function of pressure, temperature and time. This involved the use of radioactive decay schemes in metamorphic minerals for understanding the possible geologic significance of the ages provided by these chronometers.

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Fossil Hominin Teeth Using New Synchrotron Microtomography

Fossil Hominin Teeth Using New Synchrotron Microtomography | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Ath Godelitsas's insight:

The authors present a new approach combining Synchrotron virtual histology and high quality three-dimensional rendering of dental surfaces and internal interfaces.

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Witwatersrand Diamonds Suggest Plate Tectonics Started 3.5 Billion Years Ago (via @deepcarb)

Witwatersrand Diamonds Suggest Plate Tectonics Started 3.5 Billion Years Ago (via @deepcarb) | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
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Kim Leslie's curator insight, January 19, 5:43 PM

Earth Science Students - what do you think? These scientists obviously weren't alive 3.5 billion years ago to witness this - so how do they know? 

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Incidental nanomaterials in the environment, and why it is critical that we pay attention (GEOC59) by Michael Hochella

Incidental nanomaterials in the environment, and why it is critical that we pay attention (GEOC59) by Michael Hochella | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
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ICDD Dancing Molecules - Modulated Structures

PDF-4+ - The Powder Diffraction File™ - Release 2014 Modulated Structures – Dancing Molecules Modulated and composite crystals.

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Paleomineralogy of the Hadean Eon: A preliminary species list

Paleomineralogy of the Hadean Eon: A preliminary species list | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Ath Godelitsas's insight:

The dramatic mineralogical consequences of life are reflected in the absence of Hadean biomineralization; for example, the lack of extensive carbonate deposits and the associated restricted development of skarn and cave minerals prior to 4 Ga. Most importantly, it was not until after the establishment via photosynthesis of significant near-surface redox gradients that supergene alteration, redox-controlled ore deposition, and subaerial weathering in an oxidizing environment could diversify Earth's near-surface mineralogy.

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120,000 years of history in 3 millimeters of rock

120,000 years of history in 3 millimeters of rock | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Ath Godelitsas's insight:

See also: http://news.berkeley.edu/2016/01/11/rings-on-rocks-detail-north-american-paleoclimate/?utm_content=buffer3d90c&utm_medium=social&utm_source=twitter.com&utm_campaign=buffer

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Scientists discover how blue and green clays kill bacteria

Scientists discover how blue and green clays kill bacteria | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Natural antibacterial clays, when hydrated and applied topically, kill human pathogens including antibiotic resistant strains proliferating worldwide.
Ath Godelitsas's insight:

See also: http://phys.org/news/2016-01-scientists-blue-green-clays-bacteria.html

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