11 research outputs found
Π₯Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊΠ° ΠΊΠΎΡΡΠ½ΠΎΠΉ ΡΠΊΠ°Π½ΠΈ ΠΏΡΠΈ ΠΈΠΌΠΏΠ»Π°Π½ΡΠ°ΡΠΈΠΈ ΠΊΠ΅ΡΠ°ΠΌΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»Π° Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ ΡΠΈΡΠΊΠΎΠ½Π°ΡΠ° Π»Π°Π½ΡΠ°Π½Π° Π² ΡΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ΅
Background. The ceramic based on lanthanum zirconate is characterized by optimal mechanical characteristics, low corrosion potential and the absence of cytotoxicity. Thus, the possibility of its use as bone substituting material is currently studied. The purpose of the study was to determine the mechanical, morphological and x-ray spectral characteristics of bone tissue after implantation of ceramic material based on lanthanum zirconate. Materials and methods. The experiment was conducted on 27 female guinea pigs of a single line, divided into 3 groups of 9 animals each. In the main group (LZ), lanthanum zirconate rods were implanted. In the comparison group (b-TCP), fixation was performed with b-tricalcium phosphate rods. In the native control group (NC) no surgical procedures were performed. A fracture was created in distal metadiaphysis area of femur using open osteoclasia. Animals were hatched 4, 10, and 25 weeks after the start of the experiment. Bone tissue features were studied in the perifocal region. The following methods were used: uniaxial compression, scanning electron microscopy (SEM), energy dispersive x-ray microanalysis (EDxMA). The statistical analysis was performed using the Mann-Whitney test. Results. The architectonics of the newly formed bone in the LZ group appeared as a developed lacunar tubular network. The structural components of the extracellular matrix were oriented along the bone functional load vectors. The Ca/P ratio in the periimplant region of the bone in the LZ group was significantly higher than in the b-TCP and NC groups. This may indicate a high strength of the newly formed bone. Mechanical testing showed that the strength and performance of the system of βlanthanum zirconate β boneβ under uniaxial compression exceeded the similar indicators in the b-TCP group. Conclusion. The synthesized new material based on lanthanum zirconate seems promising for use in traumatology and orthopedics. Although, additional studies are needed to optimize these implants integration into bone tissue.ΠΠ²Π΅Π΄Π΅Π½ΠΈΠ΅. ΠΠ΅ΡΠ°ΠΌΠΈΠΊΠ° Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ ΡΠΈΡΠΊΠΎΠ½Π°ΡΠ° Π»Π°Π½ΡΠ°Π½Π° ΠΎΡΠ»ΠΈΡΠ°Π΅ΡΡΡ ΠΎΠΏΡΠΈΠΌΠ°Π»ΡΠ½ΡΠΌΠΈ ΠΌΠ΅Ρ
Π°Π½ΠΈΡΠ΅ΡΠΊΠΈΠΌΠΈ Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊΠ°ΠΌΠΈ, Π½ΠΈΠ·ΠΊΠΈΠΌ ΠΊΠΎΡΡΠΎΠ·ΠΈΠΎΠ½Π½ΡΠΌ ΠΏΠΎΡΠ΅Π½ΡΠΈΠ°Π»ΠΎΠΌ ΠΈ ΠΎΡΡΡΡΡΡΠ²ΠΈΠ΅ΠΌ ΡΠΈΡΠΎΡΠΎΠΊΡΠΈΡΠ½ΠΎΡΡΠΈ, ΠΏΠΎΡΡΠΎΠΌΡ Π² Π½Π°ΡΡΠΎΡΡΠ΅Π΅ Π²ΡΠ΅ΠΌΡ ΠΈΠ·ΡΡΠ°Π΅ΡΡΡ Π²ΠΎΠ·ΠΌΠΎΠΆΠ½ΠΎΡΡΡ Π΅Π΅ ΠΏΡΠΈΠΌΠ΅Π½Π΅Π½ΠΈΡ Π² ΠΊΠ°ΡΠ΅ΡΡΠ²Π΅ ΠΎΡΡΠ΅ΠΎΠ·Π°ΠΌΠ΅ΡΠ°ΡΡΠ΅Π³ΠΎ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»Π°. Π¦Π΅Π»Ρ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ ΠΎΠΏΡΠ΅Π΄Π΅Π»ΠΈΡΡ ΠΌΠ΅Ρ
Π°Π½ΠΈΡΠ΅ΡΠΊΠΈΠ΅, ΠΌΠΎΡΡΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΈΠ΅, ΡΠ΅Π½ΡΠ³Π΅Π½ΠΎΡΠΏΠ΅ΠΊΡΡΠ°Π»ΡΠ½ΡΠ΅ Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊΠΈ ΠΊΠΎΡΡΠ½ΠΎΠΉ ΡΠΊΠ°Π½ΠΈ ΠΏΡΠΈ ΠΈΠΌΠΏΠ»Π°Π½ΡΠ°ΡΠΈΠΈ ΠΊΠ΅ΡΠ°ΠΌΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»Π° Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ ΡΠΈΡΠΊΠΎΠ½Π°ΡΠ° Π»Π°Π½ΡΠ°Π½Π°. ΠΠ°ΡΠ΅ΡΠΈΠ°Π» ΠΈ ΠΌΠ΅ΡΠΎΠ΄Ρ. ΡΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½Ρ ΠΏΡΠΎΠ²Π΅Π΄Π΅Π½ Π½Π° 27 Π»ΠΈΠ½Π΅ΠΉΠ½ΡΡ
ΠΌΠΎΡΡΠΊΠΈΡ
ΡΠ²ΠΈΠ½ΠΊΠ°Ρ
, ΡΠ°Π·Π΄Π΅Π»Π΅Π½Π½ΡΡ
Π½Π° 3 Π³ΡΡΠΏΠΏΡ ΠΏΠΎ 9 ΠΆΠΈΠ²ΠΎΡΠ½ΡΡ
Π² ΠΊΠ°ΠΆΠ΄ΠΎΠΉ: Π² ΠΎΡΠ½ΠΎΠ²Π½ΠΎΠΉ (Π¦Π) Π³ΡΡΠΏΠΏΠ΅ ΠΏΡΠΎΠ²ΠΎΠ΄ΠΈΠ»Π°ΡΡ ΠΈΠΌΠΏΠ»Π°Π½ΡΠ°ΡΠΈΡ ΡΡΠ΅ΡΠΆΠ½Π΅ΠΉ ΠΈΠ· ΡΠΈΡΠΊΠΎΠ½Π°ΡΠ° Π»Π°Π½ΡΠ°Π½Π°, Π² Π³ΡΡΠΏΠΏΠ΅ ΡΡΠ°Π²Π½Π΅Π½ΠΈΡ ΡΠΈΠΊΡΠ°ΡΠΈΡ ΠΏΡΠΎΠΈΠ·Π²ΠΎΠ΄ΠΈΠ»Π°ΡΡ Π°Π½Π°Π»ΠΎΠ³ΠΈΡΠ½ΡΠΌ ΡΡΠ΅ΡΠΆΠ½Π΅ΠΌ ΠΈΠ· b-Π’ΠΠ€, Π² Π³ΡΡΠΏΠΏΠ΅ Π½Π°ΡΠΈΠ²Π½ΠΎΠ³ΠΎ ΠΊΠΎΠ½ΡΡΠΎΠ»Ρ (ΠΠ) Ρ
ΠΈΡΡΡΠ³ΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΠΌΠ°Π½ΠΈΠΏΡΠ»ΡΡΠΈΠΈ Π½Π΅ ΠΏΡΠΎΠ²ΠΎΠ΄ΠΈΠ»ΠΈΡΡ. ΠΠ΅ΡΠ΅Π»ΠΎΠΌ ΡΠΎΠ·Π΄Π°Π²Π°Π»ΡΡ Π² ΠΎΠ±Π»Π°ΡΡΠΈ Π΄ΠΈΡΡΠ°Π»ΡΠ½ΠΎΠ³ΠΎ ΠΌΠ΅ΡΠ°Π΄ΠΈΠ°ΡΠΈΠ·Π° Π±Π΅Π΄ΡΠ΅Π½Π½ΠΎΠΉ ΠΊΠΎΡΡΠΈ ΠΌΠ΅ΡΠΎΠ΄ΠΎΠΌ ΠΎΡΠΊΡΡΡΠΎΠΉ ΠΎΡΡΠ΅ΠΎΠΊΠ»Π°Π·ΠΈΠΈ. ΠΠΈΠ²ΠΎΡΠ½ΡΠ΅ Π²ΡΠ²ΠΎΠ΄ΠΈΠ»ΠΈΡΡ ΠΈΠ· ΡΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ° ΡΠ΅ΡΠ΅Π· 4, 10 ΠΈ 25 Π½Π΅Π΄. ΠΏΠΎΡΠ»Π΅ Π΅Π³ΠΎ Π½Π°ΡΠ°Π»Π°. ΠΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½Ρ ΠΎΡΠΎΠ±Π΅Π½Π½ΠΎΡΡΠΈ ΠΊΠΎΡΡΠ½ΠΎΠΉ ΡΠΊΠ°Π½ΠΈ ΠΏΠ΅ΡΠΈΡΠΎΠΊΠ°Π»ΡΠ½ΠΎΠΉ ΠΎΠ±Π»Π°ΡΡΠΈ. ΠΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π»ΠΈ ΠΌΠ΅ΡΠΎΠ΄ ΠΎΠ΄Π½ΠΎΠΎΡΠ½ΠΎΠ³ΠΎ ΡΠΆΠ°ΡΠΈΡ, ΠΌΠ΅ΡΠΎΠ΄ ΡΠ°ΡΡΡΠΎΠ²ΠΎΠΉ ΡΠ»Π΅ΠΊΡΡΠΎΠ½Π½ΠΎΠΉ ΠΌΠΈΠΊΡΠΎΡΠΊΠΎΠΏΠΈΠΈ (Π ΡΠ), ΠΌΠ΅ΡΠΎΠ΄ ΡΠ΅Π½ΡΠ³Π΅Π½ΠΎΠ²ΡΠΊΠΎΠ³ΠΎ ΡΠΏΠ΅ΠΊΡΡΠ°Π»ΡΠ½ΠΎΠ³ΠΎ ΠΌΠΈΠΊΡΠΎΠ°Π½Π°Π»ΠΈΠ·Π°. Π‘ΡΠ°ΡΠΈΡΡΠΈΡΠ΅ΡΠΊΠΈΠΉ Π°Π½Π°Π»ΠΈΠ· ΠΏΡΠΎΠ²ΠΎΠ΄ΠΈΠ»ΠΈ Ρ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΠ΅ΠΌ ΠΊΡΠΈΡΠ΅ΡΠΈΡ ΠΠ°Π½Π½Π° β Π£ΠΈΡΠ½ΠΈ. Π Π΅Π·ΡΠ»ΡΡΠ°ΡΡ. ΠΡΡ
ΠΈΡΠ΅ΠΊΡΠΎΠ½ΠΈΠΊΠ° Π½ΠΎΠ²ΠΎΠΎΠ±ΡΠ°Π·ΠΎΠ²Π°Π½Π½ΠΎΠΉ ΠΊΠΎΡΡΠΈ Π² Π³ΡΡΠΏΠΏΠ΅ Π¦Π ΠΏΡΠ΅Π΄ΡΡΠ°Π²Π»ΡΠ»Π° ΡΠΎΠ±ΠΎΠΉ ΡΠ°Π·Π²ΠΈΡΡΡ Π»Π°ΠΊΡΠ½Π°ΡΠ½ΠΎ-ΠΊΠ°Π½Π°Π»ΡΡΠ΅Π²ΡΡ ΡΠ΅ΡΡ, ΠΊΠΎΠΌΠΏΠΎΠ½Π΅Π½ΡΡ ΡΡΡΡΠΊΡΡΡΡ Π²Π½Π΅ΠΊΠ»Π΅ΡΠΎΡΠ½ΠΎΠ³ΠΎ ΠΌΠ°ΡΡΠΈΠΊΡΠ° ΠΎΡΠΈΠ΅Π½ΡΠΈΡΠΎΠ²Π°Π½Ρ Π²Π΄ΠΎΠ»Ρ Π²Π΅ΠΊΡΠΎΡΠΎΠ² ΡΡΠ½ΠΊΡΠΈΠΎΠ½Π°Π»ΡΠ½ΠΎΠΉ Π½Π°Π³ΡΡΠ·ΠΊΠΈ ΠΊΠΎΡΡΠΈ. Π‘ΠΎΠΎΡΠ½ΠΎΡΠ΅Π½ΠΈΠ΅ Π‘Π°/Π Π² ΠΏΠ΅ΡΠΈΠΈΠΌΠΏΠ»Π°Π½ΡΠ½ΠΎΠΉ ΠΎΠ±Π»Π°ΡΡΠΈ ΠΊΠΎΡΡΠΈ Π² Π³ΡΡΠΏΠΏΠ΅ Π¦Π Π±ΡΠ»ΠΎ ΡΡΡΠ΅ΡΡΠ²Π΅Π½Π½ΠΎ Π²ΡΡΠ΅, ΡΠ΅ΠΌ Π² Π³ΡΡΠΏΠΏΠ°Ρ
b-Π’ΠΠ€ ΠΈ ΠΠ, ΡΡΠΎ ΠΌΠΎΠΆΠ΅Ρ ΡΠ²ΠΈΠ΄Π΅ΡΠ΅Π»ΡΡΡΠ²ΠΎΠ²Π°ΡΡ ΠΎ Π²ΡΡΠΎΠΊΠΎΠΉ ΠΏΡΠΎΡΠ½ΠΎΡΡΠΈ Π½ΠΎΠ²ΠΎΠΎΠ±ΡΠ°Π·ΠΎΠ²Π°Π½Π½ΠΎΠΉ ΠΊΠΎΡΡΠΈ. ΠΠ΅Ρ
Π°Π½ΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΠΈΡΠΏΡΡΠ°Π½ΠΈΡ ΠΏΠΎΠΊΠ°Π·Π°Π»ΠΈ, ΡΡΠΎ ΡΠΈΡΡΠ΅ΠΌΠ° Β«ΡΠΈΡΠΊΠΎΠ½Π°Ρ Π»Π°Π½ΡΠ°Π½Π° β ΠΊΠΎΡΡΡΒ» ΠΏΡΠΈ ΠΎΠ΄Π½ΠΎΠΎΡΠ½ΠΎΠΌ ΡΠΆΠ°ΡΠΈΠΈ ΠΏΡΠ΅Π²ΡΡΠ°Π΅Ρ ΠΏΠΎ ΠΏΡΠΎΡΠ½ΠΎΡΡΠΈ Π½Π΅ΠΏΠΎΠ²ΡΠ΅ΠΆΠ΄Π΅Π½Π½ΡΡ ΠΊΠΎΡΡΠ½ΡΡ ΡΠΊΠ°Π½Ρ ΠΈ ΠΈΠΌΠ΅Π΅Ρ Π»ΡΡΡΠΈΠ΅ ΠΏΠΎΠΊΠ°Π·Π°ΡΠ΅Π»ΠΈ ΠΏΠΎ ΡΡΠ°Π²Π½Π΅Π½ΠΈΡ Ρ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΠ΅ΠΌ b-Π’ΠΠ€ Π΄Π»Ρ Π°ΡΠΌΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΠΏΠΎΠ²ΡΠ΅ΠΆΠ΄Π΅Π½ΠΈΡ. ΠΠ°ΠΊΠ»ΡΡΠ΅Π½ΠΈΠ΅. Π‘ΠΈΠ½ΡΠ΅Π·ΠΈΡΠΎΠ²Π°Π½Π½ΡΠΉ Π½ΠΎΠ²ΡΠΉ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π» Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ ΡΠΈΡΠΊΠΎΠ½Π°ΡΠ° Π»Π°Π½ΡΠ°Π½Π° ΠΏΡΠ΅Π΄ΡΡΠ°Π²Π»ΡΠ΅ΡΡΡ ΠΏΠ΅ΡΡΠΏΠ΅ΠΊΡΠΈΠ²Π½ΡΠΌ Π΄Π»Ρ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΡ Π² ΡΡΠ°Π²ΠΌΠ°ΡΠΎΠ»ΠΎΠ³ΠΈΠΈ ΠΈ ΠΎΡΡΠΎΠΏΠ΅Π΄ΠΈΠΈ, ΠΎΠ΄Π½Π°ΠΊΠΎ Π½Π΅ΠΎΠ±Ρ
ΠΎΠ΄ΠΈΠΌΡ Π΄ΠΎΠΏΠΎΠ»Π½ΠΈΡΠ΅Π»ΡΠ½ΡΠ΅ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ Π΄Π»Ρ ΠΎΠΏΡΠΈΠΌΠΈΠ·Π°ΡΠΈΠΈ ΠΈΠ½ΡΠ΅Π³ΡΠ°ΡΠΈΠΈ ΠΈΠΌΠΏΠ»Π°Π½ΡΠ°ΡΠΎΠ² ΠΈΠ· ΡΡΠΎΠ³ΠΎ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»Π° Π² ΠΊΠΎΡΡΠ½ΡΡ ΡΠΊΠ°Π½Ρ
Oxygen surface exchange kinetics of Ba0.5Sr0.5Co0.8Fe0.2O3βΞ΄
The mechanism of oxygen exchange between the gas phase and Ba0.5Sr0.5Co0.8Fe0.2O3βΞ΄oxide was evaluated by considering the inhomogeneity of the oxide surface. The applicability of existing models for the analysis of the oxygen exchange mechanism was considered. A new model with a dissociation step was suggested. The rate-determining steps of the oxygen exchange process were revealed under different experimental conditions. The change in the rate-determining step occurred at 600-650 Β°C. The probable cause was considered taking into account the parameter of nonequivalency of adsorption centers. A relationship between the oxygen isotope redistribution rates and the rates of the elementary steps in a βgas phase-solid oxideβ system was revealed