Synthesis and Thermal Analyses of TiO2-Derived Nanotubes Prepared by the Hydrothermal Method

2004 ◽  
Vol 19 (4) ◽  
pp. 982-985 ◽  
Author(s):  
Yoshikazu Suzuki ◽  
Susumu Yoshikawa
Keyword(s):  
Thermal Analysis ◽  
Aqueous Solution ◽  
Phase Transformation ◽  
Reaction Path ◽  
Thermal Analyses ◽  
X Ray Diffraction ◽  
X Ray ◽  
Xrd Study ◽  
Layered Titanate ◽  
Dehydration Behavior

TiO2-derived nanotubes were prepared by hydrothermal treatment of TiO2 powder in NaOH aqueous solution. High-temperature x-ray diffraction (HT-XRD) andthermogravimetry-differential thermal analysis (TG-DTA) demonstrated the formation of TiO2 (B) phase (a metastable polymorph of titanium dioxide) from the nanotubes under heating at ∼800 °C, which indicates the as-prepared nanotubes should be composed of layered titanate, most probably as H2Ti3O7·nH2O (n < 3). Dehydration behavior and phase transformation confirmed by the HT-XRD study have suggested reliable reaction path and have well-solved the contradictions on the nanotube-formation mechanism among previous studies.

scholarly journals The Firing Temperature of Romanesque Brick from Pác

2012 ◽  
Vol 7 (2) ◽  
pp. 79-86
Author(s):  
Rudolf Podoba ◽  
Igor Štubňa ◽  
Jozefa Lukovičová ◽  
Peter Bačík
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Diffraction Analysis ◽  
Firing Temperature ◽  
Thermal Analyses ◽  
X Ray Diffraction ◽  
X Ray ◽  
Partial Decomposition ◽  
The Church

Abstract A pavement brick taken from a Romanesque part of the church in Pác, in the Trnava County, Slovakia, was investigated by x-ray diffraction analysis (XRD) and thermal analyses as differential thermal analysis (DTA), thermogravimetry (TG) and thermodilatometry (TD). It was found that the brick contained dehydroxylated illitic clay, calcite and quartz. As revealed, dehydroxylation was completely finished and no redehydroxylation was observed. Partial decomposition of calcite was also found. The estimated firing temperature is between 600 °C and 700 °C.

A threefold interpenetrating two-dimensional zinc(II) coordination polymer: synthesis, crystal structure and selective luminescence sensing properties

2019 ◽  
Vol 75 (7) ◽  
pp. 979-984 ◽  
Author(s):  
Chen-Dong Pan ◽  
Jun Wang ◽  
Ju-Qin Xu ◽  
Kang-Feng Zhang ◽  
Xiao-Wan Wang
Keyword(s):  
Crystal Structure ◽  
Thermal Analysis ◽  
Aqueous Solution ◽  
Coordination Polymer ◽  
Diphenyl Ether ◽  
Biological Processes ◽  
Two Dimensional ◽  
X Ray Diffraction ◽  
X Ray ◽  
Coordination Framework

The Fe3+ ion is the most important element in environmental systems and plays a fundamental role in biological processes. Iron deficiency can result in diseases and highly selective and sensitive detection of trace Fe3+ has become a hot topic. A novel two-dimensional ZnII coordination framework, poly[[μ-4,4′-bis(2-methylimidazol-1-yl)diphenyl ether-κ2 N 3:N 3′](μ-4,4′-sulfonyldibenzoato-κ2 O:O′)zinc(II)], [Zn(C14H8O6S)(C20H18N4O)] n or [Zn(SDBA)(BMIOPE)] n , (I), where H2SDBA is 4,4′-sulfonyldibenzoic acid and BMIOPE is 4,4′-bis(2-methylimidazol-1-yl)diphenyl ether, has been prepared and characterized by IR, elemental analysis, thermal analysis and X-ray diffraction analysis, the latter showing that the coordination polymer exhibits a threefold interpenetrating two-dimensional 44-sql network. In addition, it displays a highly selective and sensitive sensing for Fe3+ ions in aqueous solution.

scholarly journals Thermal Annealing and Phase Transformation of Serpentine-Like Garnierite

Minerals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 188
Author(s):  
Arun Kumar ◽  
Michele Cassetta ◽  
Marco Giarola ◽  
Marco Zanatta ◽  
Monique Le Guen ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Raman Spectroscopy ◽  
Phase Transformation ◽  
Differential Thermal Analysis ◽  
Thermal Treatment ◽  
Room Temperature ◽  
X Ray Diffraction ◽  
Thermally Induced ◽  
X Ray ◽  
Micro Raman Spectroscopy

This study is focused on the vibrational and microstructural aspects of the thermally induced transformation of serpentine-like garnierite into quartz, forsterite, and enstatite occurring at about 620 °C. Powder specimens of garnierite were annealed in static air between room temperature and 1000 °C. The kinetic of the transformation was investigated by means of thermogravimetric and differential thermal analysis, and the final product was extensively characterized via micro-Raman spectroscopy and X-ray diffraction. Our study shows that serpentine-like garnierite consists of a mixture of different mineral species. Furthermore, these garnierites and their composition can provide details based on the mineralogy and the crystalline phases resulting from the thermal treatment.

Synthesis, crystal structures and phase transformation of the new solid-state forms of tetrandrine

RSC Advances ◽  
2014 ◽  
Vol 4 (107) ◽  
pp. 62586-62593 ◽  
Author(s):  
Zhengzheng Zhou ◽  
Henry H. Y. Tong ◽  
Liang Li ◽  
Fanny L. Y. Shek ◽  
Yang Lv ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Phase Transformation ◽  
Solid State ◽  
Crystal Structures ◽  
X Ray Diffraction ◽  
X Ray

In this study, the solid-state forms and phase transformation of tetrandrine (Tet) were investigated and characterized using X-ray diffraction and thermal analysis.

Phase Assembly of Ti2SnC Powders

2011 ◽  
Vol 412 ◽  
pp. 187-190 ◽  
Author(s):  
Chun Long Guan ◽  
Guo Qin Liu ◽  
Ying Chun Shan
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Intermetallic Compounds ◽  
Single Phase ◽  
Reaction Path ◽  
X Ray Diffraction ◽  
X Ray ◽  
Intermediate Phases ◽  
Reaction Equations ◽  
Phase Relationships

Ti2SnC powders (Ti: Sn: C =2: 1.2: 1, mol.%) were synthesized by pressureless sintering in argon in the temperature range of 600 to 1050°C using Ti, Sn and graphite powders as the initial materials. The phase relationships during reaction in the ternary system Ti-Sn-C have been investigated. The products for identification and analysis were characterized by X-ray diffraction (XRD) and differential thermal analysis (DTA). The reaction path for the formation of Ti2SnC can be described in the following steps. Sn melted at 230°C, which provided a favorable liquid circumstance for the reactions between Ti and Sn to form Ti-Sn intermetallic compounds. Results showed that Ti6Sn5 and Ti5Sn3 intermediate phases were formed in turn with increase of temperature. Up to 1050°C, with consumption of Ti5Sn3 phases completely, the amount of Ti2SnC increased significantly. Single phase Ti2SnC with small amount of TiC was produced. Combined with the results of differential thermal analysis (DTA) and X-ray diffraction (XRD), it is revealed that Ti2SnC phase is formed by the reaction of Ti–Sn intermetallic compounds, Ti and graphite. In addition, the reaction equations of the process from 230 to 1050°C were given.

Supramolecular architecture based on high-lacunary sandwich-type building blocks: synthesis, characterization, and properties

2016 ◽  
Vol 71 (7) ◽  
pp. 783-788
Author(s):  
Qiong Wu ◽  
Xisong Miao ◽  
Hai Wang ◽  
Yongmei Wu ◽  
Jun Li ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Aqueous Solution ◽  
Building Blocks ◽  
Supramolecular Architecture ◽  
Supramolecular Framework ◽  
Supramolecular Compound ◽  
X Ray Diffraction ◽  
Antitumor Activities ◽  
X Ray ◽  
Sandwich Type

AbstractThe new supramolecular compound [Fe2(AsMo7O27)2](H2en)2(NH4)8·6H2O (1) (en = ethylenediamine) has been synthesized in aqueous solution and characterized by elemental analysis, thermal analysis, and single crystal X-ray diffraction. The structural analysis has revealed that 1 represents the first example of a polyoxometalate-based sandwich-type supramolecular hybrid constructed from hexalacunary building blocks. Owing to the presence of ethylenediammonium cations, the [Fe2(AsMo7O27)2]12– units are stabilized by multiple circular hydrogen bonds extending the structure into a 2D supramolecular framework. The magnetic properties and antitumor activities of 1 have also been studied.

Alumina (Al2O3) Nanofibers from Electrospinning

2012 ◽  
Vol 476-478 ◽  
pp. 379-382 ◽  
Author(s):  
Delin Lai ◽  
Yong Chen ◽  
Da Xiang Yang ◽  
Wei Ling Guo ◽  
Yu Xi Yu
Keyword(s):  
Electron Microscopy ◽  
Thermal Analysis ◽  
Aqueous Solution ◽  
Scanning Electron Microscopy ◽  
Differential Thermal Analysis ◽  
Aluminum Isopropoxide ◽  
X Ray Diffraction ◽  
X Ray ◽  
Heat Treated ◽  
Scanning Electron

The alumina (Al2O3) nanofibers were fabricated by electrospinning a viscous mixture of aluminum isopropoxide solution in 10% aqueous solution of PVA followed by calcination at 500~1000 °C. Tools such as scanning electron microscopy (SEM), X-ray diffraction (XRD), and thermogravimetric and differential thermal analysis (TG-DTA) were employed to characterize the obtained nanofibers. When the nanofibers were heat treated at 1000 °C, the as-prepared nanofibers have a diameter in the range of 30 ~ 100 nm, and are composed of α-Al2O3.

Phase transformation studies on anthranilic acid by thermal analysis, infrared absorption, and X-ray diffraction methods

1976 ◽  
Vol 54 (15) ◽  
pp. 2509-2513 ◽  
Author(s):  
Krishnan Rajeshwar ◽  
Etalo A. Secco
Keyword(s):  
Phase Transition ◽  
Thermal Analysis ◽  
Phase Transformation ◽  
Infrared Absorption ◽  
Anthranilic Acid ◽  
X Ray Diffraction ◽  
X Ray

The kinetic, structural, and thermodynamic aspects of the phase transition, orthorhombic I → orthorhombic II, in anthranilic acid (o-C6H4NH2COOH) were investigated by thermal analysis, infrared absorption, and X-ray diffraction methods.

Aluminothermic reaction path in the synthesis of a TiB2–Al2O3 composite

1997 ◽  
Vol 12 (7) ◽  
pp. 1681-1684 ◽  
Author(s):  
V. Sundaram ◽  
K. V. Logan ◽  
R. F. Speyer
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Reaction Path ◽  
X Ray Diffraction ◽  
Thermite Reaction ◽  
X Ray ◽  
Aluminothermic Reaction ◽  
Elemental Boron ◽  
Al2o3 Composite ◽  
Reaction Barriers

Differential thermal analysis, in air and argon, in concert with x-ray diffraction, was performed on 2- and 3-component mixtures of Al, B2O3, and TiO2, to foster an understanding of the reaction path involved in the TiB2-forming thermite reaction. In argon, aluminum reacted with B2O3 to form elemental boron, and reacted with TiO2 to form AlTi3. These two products reacted just after boron was made available at ∼1060 °C to form TiB2. Formation of Al18B4O33 by reaction between B2O3 reactant and Al2O3 product attenuated the yield of TiB2, but facilitated its formation by extraction of Al2O3 reaction barriers.

Sign in / Sign up

Export Citation Format

Share Document