scholarly journals Dissolution kinetics of synthetic and natural meta-autunite minerals,X3−n(n)+[(UO2)(PO4)]2· xH2O, under acidic conditions

2007 ◽  
Vol 8 (11) ◽  
pp. n/a-n/a ◽  
Author(s):  
D. M. Wellman ◽  
K. M. Gunderson ◽  
J. P. Icenhower ◽  
S. W. Forrester
Keyword(s):  
Dissolution Kinetics ◽  
Acidic Conditions ◽  
Kinetics Of

Characterization of Type B Carbonate Apatite Sintered Bodies

2011 ◽  
Vol 1301 ◽  
Author(s):  
N. Watanobe ◽  
T. Yoshioka ◽  
T. Ikoma ◽  
T. Kuwayama ◽  
T. Higaki ◽  
...  
Keyword(s):  
Dissolution Kinetics ◽  
Carbonate Apatite ◽  
Artificial Bone ◽  
Type B ◽  
Desorption Process ◽  
Different Temperatures ◽  
Acidic Conditions ◽  
Kinetics Of ◽  
Potential Use

ABSTRACTThe dissolution kinetics of type B carbonate apatite (CAp) disks sintered at different temperatures were investigated under acidic conditions similar to an osteoclastic desorption process in bone remodeling. The type B CAp disks, which were uniaxially pressed at 98MPa and sintered at temperatures of 600 to 700 ºC, showed single crystalline phase and a high relative density of 60-62 % compared to the stoichiometric density of 3.16g/cm3 of hydroxyapatite (HAp). The dissolution rate of type B CAp disks sintered at 650 ºC was 3.5 times faster than that of HAp disks at 650 ºC. These results indicate that the Type B CAp sintered disks show potential use as a biodegradable material for artificial bone.

Dissolution kinetics of synthetic LaPO4-monazite in acidic media

MRS Advances ◽  
2018 ◽  
Vol 3 (21) ◽  
pp. 1133-1137 ◽  
Author(s):  
Yulia Arinicheva ◽  
Stefan Neumeier ◽  
Felix Brandt ◽  
Dirk Bosbach ◽  
Guido Deissmann
Keyword(s):  
Single Phase ◽  
Dissolution Kinetics ◽  
Dissolution Process ◽  
Temperature Range ◽  
Long Term Stability ◽  
Aqueous Environments ◽  
Fundamental Understanding ◽  
Acidic Conditions ◽  
Kinetics Of

Single-phase monazite-type ceramics are discussed as waste forms for the safe disposal of surplus plutonium or separated minor actinides. To derive a fundamental understanding of the long-term stability of these materials under repository relevant conditions, the dissolution kinetics of synthetic lanthanum monazite (LaPO4) were studied in dynamic dissolution experiments in the temperature range from 50 to 90°C under acidic conditions. The surface area normalised dissolution rates increased with temperature from 3.2·10-5 g m-2 d-1 at 50°C to 1.8·10-4 g m-2 d-1 at 90°C. The apparent activation energy Ea of the dissolution process was determined to be about 44 kJ mol-1, indicating a predominantly surface reaction controlled dissolution process in this temperature range. From thermodynamic considerations it can be inferred that the dissolution of the LaPO4 ceramics is governed by the dissolution of a thin layer of La-rhabdophane (LaPO4 · 0.667H2O) forming at the monazite surface in low temperature aqueous environments.

Short time dissolution kinetics of refractory elements Fe, Al, and Ti in Asian outflow-impacted marine aerosols and implications

2013 ◽  
Vol 79 ◽  
pp. 93-100 ◽  
Author(s):  
Shih-Chieh Hsu ◽  
Fei-Jan Lin ◽  
Tsun-Hsien Liu ◽  
Shuen-Hsin Lin ◽  
Shuh-Ji Kao ◽  
...  
Keyword(s):  
Dissolution Kinetics ◽  
Marine Aerosols ◽  
Refractory Elements ◽  
Short Time ◽  
Kinetics Of

Improvement of Aqueous Solubility and Dissolution Kinetics of Canrenone by Solid Dispersion in Sucroester

1988 ◽  
Vol 14 (6) ◽  
pp. 791-803 ◽  
Author(s):  
Augusta Obikili ◽  
Michel Deyme ◽  
Denis Wouessidjewe ◽  
Dominique Duchěne
Keyword(s):  
Solid Dispersion ◽  
Dissolution Kinetics ◽  
Aqueous Solubility ◽  
Kinetics Of
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