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lead tetramethyl synthesis

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Journal Article
Published: 01 December 2005
Clays and Clay Minerals (2005) 53 (6): 622–630.
... considerations as this reaction consumes carbon dioxide and methane, both greenhouse gases. The factor leading to increased environmental interest in this process is the endothermic nature of the reaction that makes it possible to store solar energy as synthesis gas. However, due to the deactivation...
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Journal Article
Published: 01 October 2005
Clays and Clay Minerals (2005) 53 (5): 528–535.
...-particle size. This decrease of particle size gave rise to an improvement in the diffusion of the Al precursor towards the core of the clay grain leading to solids with increased surface areas, basal spacing and X-ray diffraction peak definition. By optimizing the synthesis parameters directly involved...
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Journal Article
Published: 01 May 2008
American Mineralogist (2008) 93 (5-6): 946–949.
..., structural studies of Mg 2 SiO 4 glass have proved to be difficult in the past due to the experimental challenges involved in the synthesis of these glasses, arising primarily from their extremely poor glass-forming tendency. Previous vibrational spectroscopic studies of orthosilicate glasses of pure...
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Journal Article
Published: 01 January 2024
Russ. Geol. Geophys. (2024) 65 (1): 137–153.
... Science Center of the Ural Branch of the Russian Academy of Sciences (IG KSC UB RAS (Syktyvkar)) by leading chemical engineer E.A. Tumanova using the EA 1110 (CHNS-O) CE Instruments elemental analyzer. Organic petrography is studied at the IG KSC UB RAS using MeF-2 and Nikon Eclipse E400Pol...
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Journal Article
Published: 01 February 2010
Clays and Clay Minerals (2010) 58 (1): 72–78.
... peroxide) 8 TT (trioctyl trimellitate) 1 TETD (tetramethyl thiuram disulfide) 1.5 CZ (cyclohexyl-2-benzothiazole sulfenamide) 1.5 S (sulfur) 0.5 Observation by TEM was performed on ultra-thin films prepared by cryo-ultramicrotomy using a JEM-1200EX (JOEL, Japan...
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Journal Article
Published: 01 November 2007
American Mineralogist (2007) 92 (11-12): 1875–1880.
...+ (and of numerous other trace elements) in pyrope-grossular garnets. 45 Sc is, in principle, a quite favorable nuclide for solid-state NMR, having 100% natural abundance and a resonant (Larmor) frequency not far below the widely studied 27 Al, both leading to high sensitivity. Its relatively large quadrupolar...
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Journal Article
Published: 01 June 2012
European Journal of Mineralogy (2012) 24 (3): 405–428.
... ., 1996 ). Depending on the pH-value of the synthesis mixture a certain fraction of the molecule is always protonated. It has been shown by solid-state 13 C NMR spectroscopy that in the structure of layer silicate PREFER the doubly protonated form of 4-amino-2,2,6,6-tetramethyl-piperidine is included...
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Journal Article
Published: 01 January 2005
Reviews in Mineralogy and Geochemistry (2005) 59 (1): 187–210.
... Zubay G ( 2000 ) Origins of Life on the Earth and in the Cosmos . Academic Press , San Diego, CA Zubay G ( 1998 ) Studies on the lead-catalyzed synthesis of aldopentoses . Origins Life Evol Biosphere 28 : 13 – 26 ...
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Journal Article
Published: 01 October 2011
Clays and Clay Minerals (2011) 59 (5): 446–458.
... can lead to new types of enhanced polymer composites. The present study was undertaken to test the application of montmorillonite to NR using OMMT and a newly synthesized flame-retardant hyper-branched organo-montmorillonite, FR-HOMMT, as reinforcing and flame-retardant agents, respectively...
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Journal Article
Published: 01 July 2018
American Mineralogist (2018) 103 (7): 1044–1055.
... probes 4-trimethylammonium, 2,2,6,6 tetramethyl-piperidine-1oxyl Bromide (termed CAT1) and 4-octyl dimethylammonium, 2,2,6,6 tetramethyl-piperidine-1oxyl Bromide (termed CAT8) were selected because they have been successfully employed in previous investigations of similar systems. Here, the main goal...
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Journal Article
Journal: Clay Minerals
Published: 01 June 2018
Clay Minerals (2018) 53 (2): 271–287.
... surface and the negatively charged dye molecules. On the other hand, Fe impregnation increased the zeta potential of kaolinite, leading to a greater adsorption capacity compared to its natural and acid-activated counterparts. In addition, the adsorption rate increased when increasing the suspension...
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Journal Article
Journal: Clay Minerals
Published: 01 March 2019
Clay Minerals (2019) 54 (1): 41–48.
... of cations in an intercalation process, leading to a modification of the hydrophilic/hydrophobic ratio of smectite surfaces if, for example, organic cations such as alkylammonium cations are used for intercalation into the interlayer space. Such modification may enhance the capacity of smectites to retain...
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Journal Article
Published: 01 February 2003
American Mineralogist (2003) 88 (2-3): 410–423.
... was chosen to maximize signal to noise in the spectrum. Test spectra collected using longer relaxation delays exhibited identical relative peak intensities, indicating that differential relaxation between the signals was minimal. Spectra and chemical shifts (δ) were referenced to external tetramethyl silane...
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Journal Article
Published: 01 January 2005
Reviews in Mineralogy and Geochemistry (2005) 59 (1): 85–108.
..., colloid formation or complexation by organic compounds can lead to elevated concentrations of dissolved Fe(III), even at neutral pH ( Cornell and Schwertmann 2003 ; Kraemer 2004 ). At strongly alkaline or strongly acidic pH, ferric iron oxides can be dissolved because of their amphoteric character...
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Journal Article
Published: 01 July 2009
American Mineralogist (2009) 94 (7): 905–915.
...”-type probe with 3.2 mm zirconia rotors, and are referenced to tetramethyl silane (TMS). Small, high-pressure samples (4 to 11 mg) were spun at 20 kHz in a rotor containing a spacer to place the sample in the field center; larger samples (e.g., forsterite, 46 mg) were spun at 12 kHz in a rotor...
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Journal Article
Published: 01 January 2000
Reviews in Mineralogy and Geochemistry (2000) 41 (1): 335–419.
... from fluctuations in the charge density of the component atoms or molecules. Separated, non-overlapping charge densities do indeed have such an attractive force between them, and may be represented as an expansion for which the leading term is C 6 /r 6 at large distances. The van der Waals...
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Journal Article
Published: 01 December 2010
The Canadian Mineralogist (2010) 48 (6): 1329–1357.
... and process of formation of organic minerals will lead us to understand the fate and behavior of the organic molecules in the lithosphere. With the aim of their contribution to new developments in mineralogy, we subdivide organic minerals into two groups: (1) ionic organic minerals, in which organic anions...
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Journal Article
Published: 02 January 2014
Canadian Journal of Earth Sciences (2014) 51 (3): xvii–xxxi.
... Street. For his PhD research, Collins chose to introduce the lead into the spectrometer as lead tetramethyl. This compound could be analysed to give the relative abundances of the lead isotopes with good accuracy, and because the sample was a gas, time per isotopic analysis was significantly...
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Journal Article
Published: 01 May 2018
American Mineralogist (2018) 103 (5): 776–791.
... been of materials with low (less than a few percent) contents of cations with unpaired electron spins, such as most transition metal and rare earth ions, because these can interact strongly with the observed nuclear spins, often leading to severe broadening of spectra even to the point of apparent loss...
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Journal Article
Published: 01 January 2006
Reviews in Mineralogy and Geochemistry (2006) 64 (1): 59–113.
... ( ATSDR 2005b ). Measurements of clearance rates for submicron particles of both inorganic lead, such as lead oxide and lead nitrate ( Chamberlain et al. 1978 ), and organic species, such as tetraethyl or tetramethyl lead ( Heard et al. 1979 ), are consistent with about 60-80% absorption 48 hours after...
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