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2 edition of Formation and stability of Al, Fe, and Mg interlayers in montmorillonite and vermiculite found in the catalog.

Formation and stability of Al, Fe, and Mg interlayers in montmorillonite and vermiculite

Dumitru Dumitru Carstea

Formation and stability of Al, Fe, and Mg interlayers in montmorillonite and vermiculite

by Dumitru Dumitru Carstea

  • 363 Want to read
  • 11 Currently reading

Published .
Written in English

    Subjects:
  • Montmorillonite.,
  • Vermiculite.

  • Edition Notes

    Statementby Dumitru Dumitru Carstea.
    The Physical Object
    Pagination[12], 117 leaves, bound :
    Number of Pages117
    ID Numbers
    Open LibraryOL14255516M

    You can write a book review and share your experiences. Other readers will always be interested in your opinion of the books you've read. Whether you've loved the book or not, if you give your honest and detailed thoughts then people will find new books that are right for them. Thus a primary mineral such as labradorite alteis to a secondary mineral such as kaolinite (the "kaolinization" reaction), or "volcanic ash" alters to montmorillonite (the bentonite reaction), the calcium oxide, sodium oxide, and excess silica being carried away in : Roy Platt Pennington.

      Structural-crystallochemical characteristics of Fe-illite and Fe2+-Mg-chlorite in globules, pellets, separate clayey strata among glauconite-bearing sandstones and siltstones (hereafter, sandy-silty rocks), and mudstone interlayers are also presented. Possible mechanisms of the formation of these minerals are by: The vibrational spectral profiles of Na- and Ca-montmorillonite (MMT) of controlled water layer populations (nW) was extracted by chemometric analysis of new Fourier transform infrared (FTIR) spectroscopy data and validated by mixed-layer modeling of previously published X-ray diffraction data. These efforts resolved FTIR spectral profiles of 0W, 1W, and 2W interlayers, which can now be used Cited by: 3.

    Thermal characterization of organically modified montmorillonite Wei Xiea,*, Zongming Gaoa, Kunlei Liua, Wei-Ping Pana, Richard Vaiab, Doug Hunterc, Anant Singhd aThermal Analysis Laboratory, Material Characterization Center, Department of Chemistry, Western Kentucky University, Bowling Green, KY , USA bAFRL/MLBP, Building , P Street, Wright-Patterson AFB, OH , . Abstract Adsorption of eight organic molecules on kaolin, α-Fe 2 O 3 and hydroxy-Al montmorillonite was studied to examine the effect of sorbate area on the values of the surface area of these materials. For each sorbent, the number of molecules at monolayer coverage per gram produced a single hyperbola when plotted as a function of the area occupied by an by:


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Formation and stability of Al, Fe, and Mg interlayers in montmorillonite and vermiculite by Dumitru Dumitru Carstea Download PDF EPUB FB2

) have shown that the formation of hydroxy- A1, -Fe and -Mg interlayers should be looked upon as a dynamic process which exhibits significant changes with time. He showed that initially it was much easier to form stable chlorite-like minerals in montmorillonite than in vermiculite. The layer.

montmorillonite layer. Synthesis of Mg-interlayers in vermiculite has not been previously reported. The objectives of the present study were to (1) determine the conditions ofhydroxy-Mginterlayers with respect to type of clay mineral, acidity, and time; (2) evaluate the stability of such interlayers.

Montmorillonite is a very soft phyllosilicate group of minerals that form when they precipitate from water solution as microscopic crystals, known as is named after Montmorillon in rillonite, a member of the smectite group, is a clay, meaning that it has two tetrahedral sheets of silica sandwiching a central octahedral sheet of ry: Phyllosilicates, Smectite group.

Smectite group includes dioctahedral aluminum micas of montmorillonite –beidellite and nontronite series or And Mg interlayers in montmorillonite and vermiculite book belonging to clay minerals. It has complex chemical composition. The structure is made up of three-layer package, one layer of Al octahedron sandwiched between two layers of SiO 4 tetrahedra.

Water molecules are set between three-layer ions of Al, Mg and Fe. Natural vermiculite flakes are characterized by high values of aspect ratio. In clay science, exfoliation involves a degree of separation of the layers of a host structure where units, either individual layers or stacking of several layers, are dispersed (freely oriented and independent) in a solvent or polymer matrix [].This may be achieved by intercalation, by mechanical procedures, or by Cited by: Both montmorillonite and vermiculite have high Fe exchange capacity due to the substitution of their main cations, namely Si 4+ and Al 3+, with cations having lower valency, such as Al 3+ instead of Si 4+ and Mg 2+ instead of Al 3+.

The extent and location (i.e. tetrahedral or octahedral sheets) of these substitutions give rise to clay Cited by: The possible formation of corrensite by diagenetic or hydrothermal alteration of basalt or andesite and their pyroclastics and lowmetamorphosed equivalents has been described by, e.g., Shirozu et Author: Richard April.

Carstea, D. Formation of Hydroxy—Al and—Fe, Interlayers in Montmorillonite and Vermiculite; Influence of Particle Size and Temperature: Clays and Clay Minerals, V. 16, p. – Carstea, D. and Moody, D. Physical and Chemical Properties of Sediments in the Delaware Estuary: U.S.

Army Corps of Engineers, Philadelphia District and U. Download Citation | The nature, formation, and stability of end-member illite: A hypothesis | The nature and stability of end-member illite (I), K±/O10(OH)2, a K-deficient mica, has been. is favorable for the formation of montmorillonite-type minerals, in many of which it is characteristically present.

The formation of montmorillonite-type minerals is favored by alkaline condi­ tions, and that of kaolinite by acid conditions. These relations are modified Cited by: CRYSTAL STRUCTURE OF MAGNESIUM-VERMICULITE A. McL. N axn G. W,lr-ren' Dittision of Ind'ustriol C hemis tr y, C ommonweotth S cienilrtc and' I l Res earch Or ganiz ation, M elb o ur ne, A us tr alia.

Assrn,{cr A single-crystal r-ray analysis of Mg-vermiculite has located the interlamellar water. Gibbsite crystallized from hydroxy-Al which previously had been precipitated on the interlayer surfaces of the 2 to µ fraction of montmorillonite.

Hydroxy-Al interlayers were prepared with OH/Al molar ratios of, and and were aged 1, 3, and 6 months. Vermiculite (Mg;Fe3+;Al)3(Si;Al)4O10(OH)2² 4H2O °c 20 1M i nera lD t Pub sh g, v o.

Crystal Data: Monoclinic. Point Group: 2=m: As large crystalline plates, which may have a pseudohexagonal outline; in clay-sized particles. Physical Properties: Cleavage: fg, perfect, typically relic. Tenacity: Pliable, when in large replacement sheets. Montmorillonite (Na;Ca)(Al;Mg)2Si4O10(OH)2² nH2O °c Mineral Data Publishing, version Crystal Data: Monoclinic.

Point Group: 2=m: Tiny scaly crystals, tabular on fg; as lamellar or globular microcrystalline aggregates; clayey, compact, Size: 82KB. In the mineralogical, as opposed to the commercial commodity sense, vermiculite is a precisely defined name for a group of phyllosilicates with a layer charge of between and per O 10 (OH) 2 formula unit (Bailey, ; Guggenheim et al., ).On this basis vermiculites are distinguished from smectites with lower layer charge and micas which usually have higher by:   21 November Prof.

H.Z. Harraz Presentation Clay Minerals 36 e) Vermiculite Vermiculite is a phyllosilicate clay mineral The octahedral sheet is brucite. Octahedral ions are Al, Mg, Fe The basal spacing is from 10 Å to 14 Å.

It contains exchangeable cations such as Ca2+ and Mg2+ and two layers of water within interlayers. It can. However, when Ca 2+ and Al 3+ where used as saturating cations, the clay systems formed melanoidins, whereas melanoidin formation in the Ca- and Al-quartz systems was negligible (Bosetto et al., ; Arfaioli et al., ).

Bosetto and co-workers conclude that the mineral surface is required for the formation of humic-like substances with high. The most common elements found in the 6The most common elements found in the 6-fold site are Mg (or Fe) orAlfold site are Mg (or Fe) or Al.

Dioctahedral vs Trioctahedral Mg and Al have different charges but the sheet must remain charge neutralMg and Al have different charges, but File Size: 1MB.

)(Al Fe Mg Ti )(Si Al )O 10 (OH) 2∙H 2 O. [4] Organic compound Octadecylamine C 18 H 39 N (tech., 90%) was used as an intercalant. Its melting point is 50 – 60 °C, boiling point is °C, flash point is °C and molecular mass is. Chart and Diagram Slides for PowerPoint - Beautifully designed chart and diagram s for PowerPoint with visually stunning graphics and animation effects.

Our new CrystalGraphics Chart and Diagram Slides for PowerPoint is a collection of over impressively designed data-driven chart and editable diagram s guaranteed to impress any audience. Vermiculite is similar to montmorillonite, a mineral, but it has only two interlayers of water.

After it is dried at high temperature, which removes the interlayer water, expanded” vermiculite makes an excellent insulation material. It is significantly less active than montmorillonite.The stability of hydroxy interlayers was dependent on kind of mineral matrix, whether the interlayer was Fe or Al, and the conditions of acidity under which they were initially formed.

Hydroxy-Al interlayers formed under acid conditions were more stable than those formed under alkaline conditions in both montmorillonite and vermiculite systems.When tested for arsenic removal, CTMAB-Fe montmorillonite and Fe montmorillonite showed a maximum adsorption capacities of and mg/g for As(V), respectively, and and mg/g for As(III).

Furthermore, the optimum adsorption capacities were observed at wide range of pH of 4–Cited by: 1.