Thermal stability of β-tricalcium phosphate doped with monovalent metal ions

Hydroxyapatite (HA) was synthesized in presence of 20wt% m-ZrO2by solid state reaction between tricalcium phosphate(TCP) and Ca(OH)2at 1000 °C for 2h. Similarily, Fluorine hydroxyapatite(FA) was synthesized using tricalcium phosphate and calcium fluoride as raw materials at 1000 °Cfor 3h. The as-prepared HA was mixed with 10%,25%,45%,55%,70wt% FA and the mixture was sintered at 1000°C-1400°C for 2h. The main phase and bulk density was measured. The results show that when the relative amount of FA to HA increased, the decomposition of the composite is decreased gradually because of the formation of thermally stable FHA solid solutions. Low temperature would effect the exchange of ionic between FA and HA,while high temperature would impact synthesis of composites, because high temperature would lead to dissolution of HA ,which has to react with FA. Increase the content of HA would be advantage for synthesis FHA-ZrO2composite.

Download Full-text

Thermal stability of dithiocarbamates derived from α-amino acids with different metal ions

Thermochimica Acta ◽

10.1016/0040-6031(93)80137-y ◽

1993 ◽

Vol 223 ◽

pp. 213-221 ◽

Cited By ~ 8

Author(s):

B. Macías ◽

J.J. Criado ◽

M.V. Vaquero ◽

M.V. Villa

Keyword(s):

Thermal Stability ◽

Amino Acids ◽

Metal Ions ◽

Thermal Stability Of

Download Full-text

Effect of Mg Content on Thermal Stability of β-Tricalcium Phosphate Ceramics

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.604.192 ◽

2014 ◽

Vol 604 ◽

pp. 192-195 ◽

Cited By ~ 3

Author(s):

Kristine Salma-Ancane ◽

Liga Stipniece ◽

Zilgma Irbe ◽

Marina Sokolova ◽

Guna Krieke ◽

...

Keyword(s):

Thermal Stability ◽

Chemical Composition ◽

Tricalcium Phosphate ◽

Chemical Properties ◽

Precipitation Method ◽

Sintering Behavior ◽

Remarkable Effect ◽

Mg Content ◽

Thermal Stability Of

β-Tricalcium phosphate bioceramics with small, close to bone-like amounts of Mg were obtained by modified precipitation method and following sintering. The effect of small amounts of Mg on the thermal stability, microstructure and sintering behavior of β-tricalcium phosphate bioceramics was evaluated. Addition of small amounts of Mg, can induce a remarkable effect on the physic-chemical properties of β-TCP and therefore the chemical composition of the starting materials should be controlled.

Download Full-text

Influence of alkali metal ions on thermal stability of Bi-activated NIR-emitting alkali-aluminoborosilicate glasses

Chinese Optics Letters ◽

10.3788/col201412.111601 ◽

2014 ◽

Vol 12 (11) ◽

pp. 111601-111605 ◽

Cited By ~ 5

Author(s):

Ronghua Wan Ronghua Wan ◽

Zhiguo Song Zhiguo Song ◽

Yongjin Li Yongjin Li ◽

Qun Liu Qun Liu ◽

Yuting Zhou Yuting Zhou ◽

...

Keyword(s):

Thermal Stability ◽

Alkali Metal ◽

Metal Ions ◽

Alkali Metal Ions ◽

Thermal Stability Of

Download Full-text

Theoretical and Experimental Study of New Photochromic Bis-Spiropyrans with Hydroxyethyl and Carboxyethyl Substituents

International Journal of Photoenergy ◽

10.1155/2013/752949 ◽

2013 ◽

Vol 2013 ◽

pp. 1-8 ◽

Cited By ~ 3

Author(s):

E. L. Mukhanov ◽

I. V. Dorogan ◽

A. V. Chernyshev ◽

S. O. Bezuglyi ◽

I. V. Ozhogin ◽

...

Keyword(s):

Thermal Stability ◽

Experimental Study ◽

Metal Ions ◽

Theoretical Modeling ◽

Thermal Decay ◽

Improved Stability ◽

Thermal Stability Of

Two new asymmetrical bis-spiropyrans with nonequivalent spiropyran units have been investigated. Hydroxyethyl and carboxyethyl substituents have been used to improve thermal stability of the photoinduced merocyanine forms of the bis-spiropyrans. 2-Hydroxyethyl substituted compound is characterized by 4 times more stable merocyanine isomer. 2-Carboxyethyl substituent in the hetarene part enables chelation by metal ions and controllably stabilizes the merocyanine from thermal decay. As a result of theoretical modeling and photochemical experiments, it was shown that obtained compounds are perspective prototypes for multistate light-driven switches with improved stability of photoinduced forms.

Download Full-text

Thermal Stability of Cotton Cellulose Modified with Calcium Complexes

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.983.218 ◽

2014 ◽

Vol 983 ◽

pp. 218-221

Author(s):

Ying Juan Sun ◽

Yong Li Yang ◽

Ming Gao

Keyword(s):

Experimental Data ◽

Thermal Stability ◽

Thermal Decomposition ◽

Thermal Degradation ◽

Metal Ions ◽

Activation Energies ◽

Cone Calorimetry ◽

Second Stage ◽

Calcium Complexes ◽

Thermal Stability Of

Complexes of cell-THPC-thiourea-ADP with Ca2+ have been prepared. The thermal stability and smoke suspension of the samples are determined by TG, DTA and cone calorimetry. The activation energies for the second stage of thermal degradation have been obtained by following Broido equation. Experimental data show that for the complexes of cell-THPC-thiourea-ADP with Ca2+, the activation energies and thermal decomposition temperatures are higher than those of cell-THPC-thiourea-ADP, which shows these metal ions can increase the thermal stability of cell-THPC-thiourea-ADP

Download Full-text

Thermal Stability and Smoke Suspension of Cotton Cellulose Modified with Magnesium Complexes

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.983.324 ◽

2014 ◽

Vol 983 ◽

pp. 324-327

Author(s):

Fa Chao Wu ◽

Chun Yan Chao ◽

Shuang Tian

Keyword(s):

Experimental Data ◽

Thermal Stability ◽

Thermal Decomposition ◽

Metal Ions ◽

Heat Release ◽

Cotton Cellulose ◽

Cone Calorimetry ◽

Magnesium Complexes ◽

Calorimetry Data ◽

Thermal Stability Of

Complexes of cell-THPC-thiourea-ADP with Mg2+ have been prepared. The thermal stability and smoke suspension of the samples are determined by TG, DTA and cone calorimetry. Experimental data show that for the complexes of cell-THPC-thiourea-ADP with Mg2+, thermal decomposition temperatures are higher than those of cell-THPC-thiourea-ADP, which shows these metal ions can increase the thermal stability of cell-THPC-thiourea-ADP. The cone calorimetry data indicate that the metal ions greatly decrease the smoke, CO and CO2 generation of cell-THPC-thiourea-ADP, which can be used as smoke suppressants. However, there are no obvious effects for these metal ions on heat release of samples.

Download Full-text