scholarly journals Interlamellar amino functionalization of kaolinite

1997 ◽  
Vol 75 (11) ◽  
pp. 1766-1772 ◽  
Author(s):  
James J. Tunney ◽  
Christian Detellier
Keyword(s):  
Thermal Analysis ◽  
Thermal Decomposition ◽  
Nmr Spectroscopy ◽  
Structural Model ◽  
Hydroxyl Group ◽  
Two Dimensional ◽  
Amino Groups ◽  
Surface Hydroxyl ◽  
Silicate Surface ◽  
Ir Analysis

The interlamellar surface of kaolinite has been modified with molecules possessing amino functionalities. Either the dimethyl sulfoxide intercalate of kaolinite (Kao/DMSO) or the N-methylformamide intercalate of kaolinite (Kao/NMF) were used as starting materials. One of the products, an ethanolamine functionalized kaolinite (Kao–EOA) was resistant to thermal decomposition in both air and N2 atmospheres up to temperatures greater than 150 °C. Based on results from thermal analysis, IR analysis, 13CCP/MAS NMR spectroscopy, and elemental analysis, a structural model is proposed in which every third interlayer surface hydroxyl group on the aluminol (Al-OH) surface of kaolinite is either replaced with an interlayer Al-OCH2CH2NH2 group or is strongly H-bonded to an aminoalcohol molecule. A mixture of both types of linkages could coexist. The amino groups that point away from this surface are each keyed into the -(SiO−)6 macro-rings of the adjacent silicate surface, resulting in an amino-functionalized ordered two-dimensional organo-mineral assembly. Keywords: kaolinite, halloysite, organo-mineral nanocomposites, clay functionalization, supramolecular assemblies.

scholarly journals Synthesis, Characterization and Thermal Analysis of a New Acetic Acid (2-Hydroxy-benzylidene)-hydrazide and its Complexes with Hg(II) and Pd(II)

2011 ◽  
Vol 8 (s1) ◽  
pp. S13-S18
Author(s):  
Hajar Sahebalzamani ◽  
Shahriare Ghammamy ◽  
Shaghayegh Dexhkam ◽  
Alireza Hemati Moghadam ◽  
Farhod Siavoshifar
Keyword(s):  
Thermal Analysis ◽  
Thermal Decomposition ◽  
Acetic Acid ◽  
Thermal Properties ◽  
Nmr Spectroscopy ◽  
Coordination Mode ◽  
Spectral Techniques ◽  
H Nmr ◽  
Multi Stage ◽  
Ft Ir

The new complexes have been synthesized by the reaction of Hg(II) and Pd(II) with acetic acid(2-hydroxy-benzylidene)- hydrazide (L). These new complexes were characterized by elemental analysis, IR, H NMR spectroscopy and UV spectral techniques. The changes observed between the FT-IR, H NMR and UV-Vis spectra of the ligands and of the complexes allowed us to establish the coordination mode of the metal in complexes. Thermal properties, TG-DTA of these complexes were studied. TG- DTA and other analytical methods have been applied to the investigation of the thermal behavior and structure of the compounds [M(L)2]Cl2M= Hg, Pd. Thermal decomposition of these compounds is multi-stage processes.

Thermal decomposition of monocalcium aluminate decahydrate (CaAl2O4·10H2O) investigated by in-situsynchrotron X-ray powder diffraction, thermal analysis and27Al,2H MAS NMR spectroscopy

2008 ◽  
pp. 455-462 ◽  
Author(s):  
Axel Nørlund Christensen ◽  
Torben R. Jensen ◽  
Bente Lebech ◽  
Jonathan C. Hanson ◽  
Hans J. Jakobsen ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Thermal Decomposition ◽  
Nmr Spectroscopy ◽  
Powder Diffraction ◽  
Mas Nmr ◽  
X Ray

The thermal decomposition of magnesium alcoholates to magnesia (MgO): studies by IR and thermal analysis

1997 ◽  
Vol 101-103 (1-2) ◽  
pp. 79-84 ◽  
Author(s):  
H Thoms
Keyword(s):  
Thermal Analysis ◽  
Thermal Decomposition

MICRO LEVEL TWO DIMENSIONAL STRESS AND THERMAL ANALYSIS ANODE/ELECTROLYTE INTERFACE OF A SOLID OXIDE FUEL CELL

2017 ◽  
pp. 110-120 ◽  
Author(s):  
S. Celik ◽  
B. Ibrahimoglu ◽  
M. D. Mat ◽  
Yu. Kaplan ◽  
T. N. Veziroglu
Keyword(s):  
Thermal Analysis ◽  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Two Dimensional ◽  
Electrolyte Interface ◽  
Micro Level

scholarly journals Form Birefringence Effect of Ultradrawn Polyethylene Determined by Two Dimensional Composite Structural Model

1991 ◽  
Vol 23 (10) ◽  
pp. 1149-1155
Author(s):  
Masaru Matsuo ◽  
Tetsuya Ogita
Keyword(s):  
Structural Model ◽  
Two Dimensional ◽  
Form Birefringence ◽  
Birefringence Effect

scholarly journals An Experimental Study of the Decomposition and Carbonation of Magnesium Carbonate for Medium Temperature Thermochemical Energy Storage

Energies ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1316
Author(s):  
Daniel Mahon ◽  
Gianfranco Claudio ◽  
Philip Eames
Keyword(s):  
Thermal Analysis ◽  
Thermal Decomposition ◽  
Energy Storage ◽  
Magnesium Carbonate ◽  
Experimental Results ◽  
Future Research ◽  
Medium Temperature ◽  
Different Temperatures ◽  
Decomposition Enthalpy ◽  
Co2 Atmosphere

To improve the energy efficiency of an industrial process thermochemical energy storage (TCES) can be used to store excess or typically wasted thermal energy for utilisation later. Magnesium carbonate (MgCO3) has a turning temperature of 396 °C, a theoretical potential to store 1387 J/g and is low cost (~GBP 400/1000 kg). Research studies that assess MgCO3 for use as a medium temperature TCES material are lacking, and, given its theoretical potential, research to address this is required. Decomposition (charging) tests and carbonation (discharging) tests at a range of different temperatures and pressures, with selected different gases used during the decomposition tests, were conducted to gain a better understanding of the real potential of MgCO3 for medium temperature TCES. The thermal decomposition (charging) of MgCO3 has been investigated using thermal analysis techniques including simultaneous thermogravimetric analysis and differential scanning calorimetry (TGA/DSC), TGA with attached residual gas analyser (RGA) and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) (up to 650 °C). TGA, DSC and RGA data have been used to quantify the thermal decomposition enthalpy from each MgCO3.xH2O thermal decomposition step and separate the enthalpy from CO2 decomposition and H2O decomposition. Thermal analysis experiments were conducted at different temperatures and pressures (up to 40 bar) in a CO2 atmosphere to investigate the carbonation (discharging) and reversibility of the decarbonation–carbonation reactions for MgCO3. Experimental results have shown that MgCO3.xH2O has a three-step thermal decomposition, with a total decomposition enthalpy of ~1050 J/g under a nitrogen atmosphere. After normalisation the decomposition enthalpy due to CO2 loss equates to 1030–1054 J/g. A CO2 atmosphere is shown to change the thermal decomposition (charging) of MgCO3.xH2O, requiring a higher final temperature of ~630 °C to complete the decarbonation. The charging input power of MgCO3.xH2O was shown to vary from 4 to 8136 W/kg with different isothermal temperatures. The carbonation (discharging) of MgO was found to be problematic at pressures up to 40 bar in a pure CO2 atmosphere. The experimental results presented show MgCO3 has some characteristics that make it a candidate for thermochemical energy storage (high energy storage potential) and other characteristics that are problematic for its use (slow discharge) under the experimental test conditions. This study provides a comprehensive foundation for future research assessing the feasibility of using MgCO3 as a medium temperature TCES material. Future research to determine conditions that improve the carbonation (discharging) process of MgO is required.

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