scholarly journals Transformation from anatase to rutile titania using hydrothermal method: Investigation of morphology and thermal stability

2020 ◽  
Vol 32 (4) ◽  
pp. 1511
Author(s):  
Mpanza P. Ntsikelelo ◽  
Malevu D. Thembinkosi ◽  
Lehloonolo F. Koao ◽  
Motloung V. Setumo ◽  
Motaung E. Tshwafo
Keyword(s):  
Thermal Stability ◽  
Hydrothermal Method ◽  
Rutile Titania

Synthesis, Characterization and Thermal Stability of Highly Crystallized Titania Nanotubes

2004 ◽  
Vol 836 ◽  
Author(s):  
B. Poudel ◽  
W. Z. Wang ◽  
C. Dames ◽  
J. Y. Huang ◽  
S. Kunwar ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Hydrothermal Method ◽  
Phase Stability ◽  
Acid Treatment ◽  
Filling Fraction ◽  
Volume Filling ◽  
Synthesis Conditions ◽  
Outside Diameter ◽  
Thermal Stability Of ◽  
Crystallization Structure

ABSTRACTGram quantities of titania (TiO2) nanotubes, with typical outside diameter about 9 nm, wall thickness about 2.5 nm, and length about 600 nm, were synthesized from anatase nano- and micro-powder using the hydrothermal method. The crystallization, structure, and phase stability of the nanotubes at high temperatures were systematically studied. A morphology change from nanotube to nanowire was observed at 650°C. The as-prepared nanotubes were usually contaminated with sodium impurities, other TiO2-derived phases and were poorly crystallized, but under optimized synthesis conditions the impurity phases was completely removed, resulting in highly crystallized pure nanotubes. The volume filling fraction of the autoclave as well as the concentration of the acid treatment were found to be particularly important for controlling the purity and crystallinity of the resulting nanotubes.

scholarly journals Thermal stability of self-polarization in a (K,Na)NbO3 film prepared by the hydrothermal method

2021 ◽  
Author(s):  
Akinori Tateyama ◽  
Yoshiharu Ito ◽  
Takahisa Shiraishi ◽  
Yuichiro Orino ◽  
Minoru Kuribayashi KUROSAWA ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Hydrothermal Method ◽  
Thermal Stability Of

Strontium Hydroxyapatite Synthesis, Characterization and Cell Cytotoxicity

2010 ◽  
Vol 160-162 ◽  
pp. 117-122 ◽  
Author(s):  
Zhi Hong Li ◽  
Ji Min Wu ◽  
Shu Jie Huang ◽  
J. Guan ◽  
Xi Zheng Zhang
Keyword(s):  
Thermal Stability ◽  
Hydrothermal Method ◽  
Bone Repair ◽  
X Ray Diffraction ◽  
X Ray ◽  
Strontium Hydroxyapatite ◽  
Transmission Electron ◽  
20 Nm ◽  
Thermal Stability Of ◽  
Phase Chemical

Strontium hydroxyapatite powders was prepared by the hydrothermal method using Sr(NO3)2 and (NH4)2HPO4 as reagents. Fourier transform infrared spectroscopy, X-ray diffraction, Transmission electron microscope, Energy dispersive X-ray, and Thermogravimetric-differential thermal analysis were employed to investigate the crystalline phase, chemical composition, morphology, and thermal stability of the Strontium hydroxyapatite. And the cytotoxicity of Strontium hydroxyapatite was analyzed through MTT assay. Results showed that Strontium hydroxyapatite prepared by hydrothermal Method has excellent crystal structure, good dispersion, high purity, and rod-like morphology with dimensions 200-500 nm in length and 20 nm in diameter. Meanwhile, the apatite has poor thermal stability. However, the apatite is cytocompatible and may have better biocompatibility, which can serve as strontium source incorporation into calcium phosphate cement and for bone repair.

Water-soluble green-emitting carbon nanodots with enhanced thermal stability for biological applications

Nanoscale ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 4301-4307
Author(s):  
Waheed Ullah Khan ◽  
Liying Qin ◽  
Abid Alam ◽  
Ping Zhou ◽  
Yong Peng ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Hydrothermal Method ◽  
High Temperatures ◽  
Water Soluble ◽  
Carbon Nanodots ◽  
Biological Applications ◽  
Thermally Stable ◽  
Stable Performance

Water soluble and thermally stable green emitting CNDs are prepared via a hydrothermal method. The as-obtained CNDs demostrate stable performance in T-ca cells at high temperatures.

scholarly journals An efficient strategy for improving the water stability of a nearinfrared- emissive lanthanide MOF

2020 ◽  
Vol 185 ◽  
pp. 04070
Author(s):  
Haihuan Yu ◽  
Zhongmin Su ◽  
Xiao Li
Keyword(s):  
Thermal Stability ◽  
Hydrothermal Method ◽  
Structural Stability ◽  
Near Infrared ◽  
High Water ◽  
Water Stability ◽  
Acid Base ◽  
Efficient Strategy ◽  
Practical Engineering ◽  
High Structural Stability

Near-Infrared-emissive materials have attracted substantial attention due to their unique properties. To solve the urgent requirements of high-water stability materials can be widely used in practical engineering. Hence, a novel near infrared luminescent and highly water-stable lanthanide-organic frameworks (namely Yb-MOF-Y) was synthesized under hydrothermal method by anchoring functionalized, rigid ligands 2,3,5,6-tetrafluoroterephthalic acid and 1,10-phenanthroline onto its skeleton. It is notable that the Yb-MOF-Y possess high structural stability in water for 28 days, in different acid-base solutions (pH = 4-10) for 3 days and the thermal stability in water (-20 °C to 60 °C) for 3 days. Remarkably, luminescent studies reveal that the Yb-MOF-Y can be used as a potential material in near infrared field.

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