搜索结果: 61-75 共查到“理学 Silica”相关记录78条 . 查询时间(0.026 秒)
A moganite-type phase in the silica analog phosphorus oxynitride
phosphorus oxynitride silica system moganite
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2012/3/30
A new polymorph of phosphorus oxynitride (PON) a silica analog has been recovered at ambient
pressure by quenching after a treatment at 850 ?C under a pressure of 2.5 GPa using cristobalite- or
quar...
A new high-pressure silica phase obtained by molecular dynamics - Reply
high-pressure silica phase obtained molecular dynamics - Reply
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2012/4/6
Kanzaki et al. (1997) argue that SBAD structure cannot beand baddeleyiteonsidered to be intermediate between ?-PbO2 at highstructures. The similarity between SBAD and ?-PbO2pressure was emphasized by ...
A new high-pressure silica phase obtained by molecular dynamics - Discussion
high-pressure silica phase obtained molecular dynamics - Discussion
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2012/4/6
Belonoshko et al. (1996) argued that they found a new high-pressure silica phase (which they denoted SBAD) with spacegroup Pnc2 from molecular dynamics (MD) simulations. How-ever, we noticed that a si...
Effects of Acidity on the Hydrothermal Synthesis of Kaolinite from Silica-Gel and Gibbsite
Crystallite size Crystallization Hydrothermal synthesis Kaolinite pH Stacking fault
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2011/12/27
Abstract: A comparative study is reported in which kaolinite has been hydrothermally synthesized at several pH conditions. The syntheses were carried out at 220 亱C for 3 to 10 d with distilled water o...
A new high-pressure silica phase obtained by molecular dynamics
high-pressure silica phase obtained molecular dynamics
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2012/4/5
Amolecular dynamics study withanalytical and ab initio interatomic potentials revealed the possibility of a new silica phase withPnc2 structure, which is more stable than sti-shovite and its CaCl2-lik...
Four-membered rings in silica and aluminosilicate glasses
Four-membered rings silica aluminosilicate glasses
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2012/4/5
Assignmentofthe peaksnear485em-I in vibrational spectra ofSi02-M7;:;Al02(where M=an alkali oralkaline earth element) glassesto v,(T-O-T) modesin four-membered
rings wastested withmolecularorbital cal...
Oxygen Isotopic Constraints on the Origin of Nodular Silica-Apatite from the Har Peres Pyroclastics, Golan Heights, Israel
Apatite Har Peres pyroclastics Oxygen isotope
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2011/12/29
Oxygen isotope composition of three types of unique nodules which consist of amorphous silica-apatite, cristobalite-apatite and tridymite-apatite associations interspersed amidst basaltic pyroclastics...
Effects of the Structure of Silica-Alumina Gel on the Hydrothermal Synthesis of Kaolinite
Gel structure Hydrothermal synthesis Kaolinite Nuclear magnetic resonance Silica-alumina gel
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2011/12/29
Kaolinite was hydrothermally synthesized from two kinds of silica-alumina gels to examine the effect of the structure of the starting material. Two kinds of gels were prepared by precipitation at diff...
Apparent and Partial Specific Sorption of Oxine by Montmorillonite and Silica Gel in Binary Mixtures
Adsorption Mixtures Montmorillonite Oxine Silica gel Specific sorption
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2012/1/12
Oxine sorption by binary mixtures of montmorillonite and silica gel was studied at pH 5 as a function of oxine concentration and mixture composition. The investigation was made to resolve the problem ...
Replacement of Quartz by Opaline Silica during Weathering of Petrified Wood
Opal-A Opal-CT Petrified wood Quartz Silica Weathering
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2012/2/2
A mineralogical investigation by X-ray powder diffraction and optical, scanning, and transmission electron microscopy of partially weathered petrified wood in the Yegua Formation (Eocene) of east-cent...
Characteristics of Ferrihydrites Formed by Oxidation of FeCl2 Solutions Containing Different Amounts of Silica
Ferrihydrite Hematite Iron Lepidocrocite Oxidation Silica
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2012/2/3
Well-crystallized ferrihydrite as indicated by its X-ray powder diffraction pattern and low solubility in acidified oxalate (Feo/Fet = 0.27) was formed by the oxidation of FeCl2 solution containing Si...
Influence of Silica Content on the Surface Charge Characteristics of Allophanic Clays
Allophane Andisols Desilication Soils Specific surface Zero point of charge
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2012/2/7
The surface and charge characteristics of 6 allophanic clays originating from a climatosequence of Andisols have been studied by titration, ion retention, surface area, and reactivity measurements. Se...
Properties of Silica-Intercalated Hectorite
Acidity Hectorite Infrared spectroscopy Intercalation Silica Surface area
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2012/2/8
Silica-intercalated hectorite with an 001 spacing of 12.6 侌 and a N2 BET surface area of 220 m2/ g was prepared by hydrolysis and oxidation at 500亱C of hectorite containing a silicon acetylacetonate c...
Laminar Opaline Silica from Some Volcanic Ash Soils in New Zealand
Andosols Opaline silica Volcanic ash soils Weathering
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2011/11/22
Laminar Opaline Silica from Some Volcanic Ash Soils in New Zealand.
Intercalation of Silica in Smectite
Hectorite Intercalation Silica Smectite Vermiculite
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2012/2/8
Silica has been intercalated in swelling clays by hydrolysis and/or oxidation of tris(acetylacetonato)silicon(IV) cations, Si(acac)3+, and polychlorosiloxanes, (-SiOCl2-)n, in the interlamellar region...