搜索结果: 1-15 共查到“地质学 NMR”相关记录39条 . 查询时间(0.312 秒)
构造煤13C NMR 谱及其结构成分的应力效应
构造煤 应力效应
2009/3/19
运用NMR(CP/MAS+TOSS)方法, 获得了不同类型构造煤的13C NMR高分辨谱. 在此基础上, 进行谱的拟合和峰的解叠, 求出各种碳官能团的相对含量, 并结合Ro, max, XRD和元素分析成果, 进一步研究了不同类型构造煤结构及成分变化的应力效应. 结果表明: Ro, max不仅是反映煤级的重要指标, 而且也是反映构造煤结构应力效应的有效指标. 煤大分子基本结构单元堆砌度Lc以及La...
A Nuclear Magnetic Resonance (NMR) and Fourier-Transform Infrared (FTIR) Study of Glycine Speciation on a Cd-Rich Montmorillonite
Adsorption Amino Acids Cadmium Glycine Montmorillonite Speciation
2011/12/6
Abstract: As a consequence of treatments with glycine solutions, glycine molecules enter the interlayer of both Ca- and Cd-rich montmorillonite. Measurements of d value suggest that at low glycine con...
Nuclear Magnetic Resonance (NMR) Study of Cd2+ Sorption on Montmorillonite
Adsorption Cadmium Montmorillonite Nuclear Magnetic Resonance
2011/12/8
Abstract: 113Cd solid-state nuclear magnetic resonance (NMR) was used to identify possible Cd2+ adsorption sites in montmorillonite. The montmorillonite was treated with 0.1 and 1 M CdCl2 aqueous solu...
Solid-state 29Si MAS NMR studies of illite and illite-smectite from shale
Solid-state 29Si MAS NMR studies illite illite-smectite shale
2012/4/1
A new method to extract quantitative information from poorly resolved Si magic-angle spinning
(MAS) nuclear magnetic resonance (NMR) spectra of natural mixed-layer illite-smectite (I-S) clays29Si
i...
Local Ca-Mg distribution of Mg-rich pyrope-grossular garnets synthesized at different temperatures revealed by 29Si MAS NMR spectroscopy
Local Ca-Mg distribution Mg-rich pyrope-grossular garnets synthesized different temperatures revealed 29Si MAS NMR spectroscopy
2012/4/1
Pyrope-grossular solid solutions, (Mg,Ca) Al Si O , of composition Py Gr and Py Gr were3 2 3 12 85 15 75 25
synthesized at 1000, 1200, and 1400 ?C and 30 kbars in a piston-cylinder device. The synt...
Three- and five-quantum 17O MAS NMR of forsterite Mg2SiO4
Three- and five-quantum 17O MAS NMR forsterite Mg2SiO4
2012/3/31
17Three- and five-quantum O MAS NMR experiments are used to resolve fully the three crystallo-
graphically distinct oxygen species in forsterite (Mg
SiO ). The chemical shift and quadrupolar pa-2 4...
Interlayer structure, anion dynamics, and phase transitions in mixed-metal layered hydroxides: Variable temperature 35Cl NMR spectroscopy of hydrotalcite and Ca-aluminate hydrate (hydrocalumite)
Cl -intercalated hydrotalcite Ca-aluminate hydrate Variable temperature
2012/3/31
The Cl NMR spectroscopy of Cl -intercalated hydrotalcite and the Ca-aluminate hydrate, the presence of
hydrocalumite (Friedel°Os salt) demonstrates dynamical behavior of interlayer C
dynamical orde...
23Na, 29Si, and 71Ga MAS-NMR spectroscopy of synthetic gallian-fluor-amphiboles
synthetic gallian-fluor-amphiboles magic-angle-spinning nuclear magnetic resonance
2012/3/31
A magic-angle-spinning nuclear magnetic resonance (MAS NMR) spectroscopic study was done
on the series of synthetic gallian-fluor amphiboles to identify the extent of Ga and Si ordering in the
Si MA...
Si,Al ordering in the double-ring silicate armenite, BaCa2Al6Si9O30?H2O: A single-crystal X-ray and 29Si MAS NMR study
BaCa2Al6Si9O30?H2O single-crystal
2012/3/30
29The SiMASNMRspectrumofarmenitefromWasenalp(Valais,Switzerland)indicates
completeSi,Alordering.Thesamechemicalshifts(82.3,95.0,and101.8ppm)were
alsomeasuredforarmenitefromRe!migny(Quebec,Canada),ho...
Solid State NMR Characterization of the Thermal Transformation of an Illite-Rich Clay
Illite Iron Paramagnetic Center Solid-State NMR Thermal Transformation
2011/12/9
Abstract: Lode, a dioctahedral illite-rich clay from Latvia belonging to the mica group of clay minerals, undergoes thermal transformation via a series of structurally disordered intermediate phases. ...
Structure and dynamics of magnesium in silicate melts: A high-temperature 25Mg NMR study
Structure dynamics magnesium silicate melts high-temperature
2012/4/1
25Mg NMR spectra for several silicate and aluminosilicate melts were obtained from 1000–1470 8C. The peaks are initially very broad, but narrow with increasing temperature to near 500 Hz at the highes...
Effects of Secondary Iron Phases on Kaolinite 27Al MAS NMR Spectra
27Al NMR Spectroscopy Goethite Halloysite Hematite Iron Kaolinite Magnetic Susceptibility
2011/12/8
Abstract: Eight kaolinite and 2 halloysite samples were analyzed using 27Al magic angle spinning nuclear magnetic resonance (MAS NMR) spectroscopy, chemical analysis and magnetic susceptibility to und...
23Na and133Cs NMR T 1 relaxation data for wet paste samples made from illite and either NaCl or CsCl solutions show that there is significant adsorption of the Na and Cs onto the surface. The Na and C...
High-temperature multi-nuclear NMR investigation of analcime
High-temperature multi-nuclear NMR investigation analcime
2012/3/31
Two analcimes of hydrothermal and diagenetic origin were investigated by in situ29Si,27Al, and 23 Na NMR from room temperature to 550 8 C, and by TGA and DSC. The two samples dehydrate at different te...
29Si MAS NMR systematics of calcic and sodic-calcic amphiboles
29Si MAS NMR systematics calcic sodic-calcic amphiboles
2012/3/30
We report the compositional systematics of the 29 Si MAS NMR spectra of richterite,[A](Na,K,Rb)1(Na,Ca,Sr)2Mg5Si8O22 (OH,F)2; pargasite, NaCa2Mg4AlSi6Al2O2(OH)2; and fluor-edenite, NaCa2Mg5Si7AlO22F2....