scholarly journals Role of sintering temperature dependent crystallization of bioactive glasses on erythrocyte and cytocompatibility

2019 ◽  
Vol 13 (1) ◽  
pp. 12-23 ◽  
Author(s):  
Shivalingam Chitra ◽  
Purushothaman Bargavi ◽  
Dhinasekaran Durgalakshmi ◽  
Padmanaban Rajashree ◽  
Subramanian Balakumar
Keyword(s):  
Mechanical Property ◽  
Structural Analysis ◽  
Sintering Temperature ◽  
Sol Gel ◽  
Secondary Phase ◽  
Phase Changes ◽  
Temperature Dependent ◽  
Bioactive Glasses ◽  
Secondary Phase Formation

Bioglass (BG) was prepared by sol-gel method and the role of sintering temperatures (600, 700 and 800?C) on crystalline phase changes, bioactivity, erythrocyte andMG-63 cell line compatibility was investigated. Increase in sintering temperature from 600 to 800?C led to the secondary phase formation that was confirmed through structural analysis. Micrographics revealed the formation of nanorods (700?C) and nanoflake like (800?C) morphologies. Biocompatibility assay showed that, BG sintered at 600?C had optimal biocompatibility while better mechanical property was noted at 700?C. Altogether, the study demonstrated that increasing the sintering temperature will result in increased crystallinity which in turn resulted in the optimal biomineralization but decreased the biocompatibility. Hence, we demonstrated the importance of temperature during the processing of BG for various applications, as it affects many properties including bioactivity and compatibility.

Sintering temperature dependent electrical properties of sol–gel grown nanostructured Bi0.95Nd0.05FeO3 multiferroics

2019 ◽  
Vol 93 (3) ◽  
pp. 666-677 ◽  
Author(s):  
Drashti Sanghvi ◽  
Hetal Boricha ◽  
Bharavi Hirpara ◽  
Sapana Solanki ◽  
V. G. Shrimali ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Sintering Temperature ◽  
Sol Gel ◽  
Temperature Dependent

Sol-Gel Derived PZT and PZTN Ceramics: A Role of Sintering Temperature

2009 ◽  
Vol 382 (1) ◽  
pp. 147-152 ◽  
Author(s):  
Chontira Sangsubun ◽  
Anucha Watcharapasorn ◽  
Sukanda Jiansirisomboon
Keyword(s):  
Sintering Temperature ◽  
Sol Gel

scholarly journals Formation, location and beneficial role of PbI2 in lead halide perovskite solar cells

2017 ◽  
Vol 1 (1) ◽  
pp. 119-126 ◽  
Author(s):  
Tian Du ◽  
Claire H. Burgess ◽  
Jinhyun Kim ◽  
Jiaqi Zhang ◽  
James R. Durrant ◽  
...  
Keyword(s):  
Solar Cells ◽  
Perovskite Solar Cells ◽  
Secondary Phase ◽  
Device Performance ◽  
Beneficial Role ◽  
Secondary Phase Formation ◽  
Halide Perovskite ◽  
Lead Halide ◽  
Post Deposition

Here we report the investigation of controlled PbI2 secondary phase formation in CH3NH3PbI3 (MAPI) photovoltaics through post-deposition thermal annealing, identifying the location of PbI2 in the active layer and its beneficial role on device performance.

Effect of OH Content on the Bioactivity of Sol-Gel Derived Glass Foam Scaffolds

2006 ◽  
Vol 309-311 ◽  
pp. 1031-1034 ◽  
Author(s):  
Julian R. Jones ◽  
T.F. Kemp ◽  
M.E. Smith
Keyword(s):  
Body Fluid ◽  
Sol Gel ◽  
Network Connectivity ◽  
Layer Formation ◽  
Silica Network ◽  
Bioactive Glasses ◽  
Oh Groups ◽  
Glass Foam ◽  
Oh Content

Bioactive glass scaffolds have been developed with interconnected macropore networks, with pore diameters in excess of 500µm and apertures in excess of 100µm, by foaming sol-gel derived bioactive glasses. Bioactive glasses bond to bone by forming a hydroxycarbonate apatite (HCA) layer on their surface on contact with body fluid, which is similar to the composition of the apatite in bone. The aim of this work was to investigate the how changing the atomic structure of the glass affects HCA layer formation. Scaffolds were synthesised at 3 sintering temperatures and were characterised using 29Si and proton MAS-NMR, from which the silica network connectivity and Si-OH groups were quantified. The rate of HCA layer formation decreased as the number of Si-OH groups decreased, confirming the role of Si-OH groups in HCA layer formation.

scholarly journals Sintering Temperature, Frequency, and Temperature Dependent Dielectric Properties of Na0.5Sm0.5Cu3Ti4O12 Ceramics

Materials ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 4805
Author(s):  
Hicham Mahfoz Kotb ◽  
Hassan A. Khater ◽  
Osama Saber ◽  
Mohamad M. Ahmad
Keyword(s):  
Grain Size ◽  
Dielectric Properties ◽  
Sintering Temperature ◽  
X Ray Diffraction ◽  
Temperature Dependent ◽  
Low Dielectric ◽  
Average Grain Size ◽  
Conventional Sintering ◽  
Calculated Activation Energy

NSCTO (Na0.5Sm0.5Cu3Ti4O12) ceramics have been prepared by reactive sintering solid-state reaction where the powder was prepared from the elemental oxides by mechanochemical milling followed by conventional sintering in the temperature range 1000–1100 °C. The influence of sintering temperature on the structural and dielectric properties was thoroughly studied. X-ray diffraction analysis (XRD) revealed the formation of the cubic NSCTO phase. By using the Williamson–Hall approach, the crystallite size and lattice strain were calculated. Scanning electron microscope (SEM) observations revealed that the grain size of NSCTO ceramics is slightly dependent on the sintering temperature where the average grain size increased from 1.91 ± 0.36 μm to 2.58 ± 0.89 μm with increasing sintering temperature from 1000 °C to 1100 °C. The ceramic sample sintered at 1025 °C showed the best compromise between colossal relative permittivity (ε′ = 1.34 × 103) and low dielectric loss (tanδ = 0.043) values at 1.1 kHz and 300 K. The calculated activation energy for relaxation and conduction of NSCTO highlighted the important role of single and double ionized oxygen vacancies in these processes.

Role of pH and temperature on silica network formation and calcium incorporation into sol–gel derived bioactive glasses

2012 ◽  
Vol 22 (4) ◽  
pp. 1613-1619 ◽  
Author(s):  
Esther M. Valliant ◽  
Claudia A. Turdean-Ionescu ◽  
John V. Hanna ◽  
Mark E. Smith ◽  
Julian R. Jones
Keyword(s):  
Network Formation ◽  
Sol Gel ◽  
Silica Network ◽  
Bioactive Glasses

scholarly journals Evaluation of the Microstructure and the Electrochemical Properties of Ce0.8(1−x)Gd0.2(1−x)CuxO[1.9(1−x)+x] Electrolytes for IT-SOFCs

2020 ◽  
Vol 10 (13) ◽  
pp. 4573 ◽  
Author(s):  
Grazia Accardo ◽  
Jae Kwan Bae ◽  
Sung Pil Yoon
Keyword(s):  
Crystal Structure ◽  
Electrochemical Properties ◽  
Sintering Temperature ◽  
Sol Gel ◽  
Ionic Conductivities ◽  
Secondary Phase ◽  
Total Conductivity ◽  
Temperature Range ◽  
Copper Addition ◽  
Dense Bodies

The influence of copper addition (0.5–2 mol%) on the crystal structure, densification microstructure, and electrochemical properties of Ce0.8Gd0.2O1.9 synthesized in a one-step sol–gel combustion synthesis route has been studied. It has been found that Cu is very active as sintering aids, with a significative reduction of GDC firing temperature. A reduction of 500 °C with a small amount of copper (0.5 mol%) was observed achieving dense bodies with considerable ionic conductivities. Rietveld refined was used to investigate the crystal structure while relative density and microstructural examination were performed in the sintering temperature range of 1000–1200 °C after dilatometer analysis. High dense bodies were fabricated at the lowest sintering temperature, which promotes the formation of Ce0.8(1−x)Gd0.2(1−x)CuxO[1.9(1−x)+x] solid solution and the absence of secondary phase Cu-rich or the segregation or copper at the grain boundary. As compared to the pure GDC an improvement of total conductivity was achieved with a maximum for the highest copper content of 2.23·10−3–9.19·10−2 S cm−1 in the temperature range of 200–800 °C.

Influence of microstructure and AlPO4 secondary-phase on the ionic conductivity of Li1.3Al0.3Ti1.7(PO4)3 solid-state electrolyte

2016 ◽  
Vol 09 (05) ◽  
pp. 1650066 ◽  
Author(s):  
Shicheng Yu ◽  
Andreas Mertens ◽  
Xin Gao ◽  
Deniz Cihan Gunduz ◽  
Roland Schierholz ◽  
...  
Keyword(s):  
Particle Size ◽  
Solid State ◽  
Ionic Conductivity ◽  
Sintering Temperature ◽  
Sol Gel ◽  
Secondary Phase ◽  
Lithium Aluminum ◽  
Phase Content ◽  
Solid State Electrolyte ◽  
Ceramic Electrolyte

A ceramic solid-state electrolyte of lithium aluminum titanium phosphate with the composition of Li[Formula: see text]Al[Formula: see text]Ti[Formula: see text](PO[Formula: see text] (LATP) was synthesized by a sol–gel method using a pre-dissolved Ti-source. The annealed LATP powders were subsequently processed in a binder-free dry forming method and sintered under air for the pellet preparation. Phase purity, density, microstructure as well as ionic conductivity of the specimen were characterized. The highest density (2.77[Formula: see text][Formula: see text] with an ionic conductivity of [Formula: see text] (at 30[Formula: see text]C) was reached at a sintering temperature of 1100[Formula: see text]C. Conductivity of LATP ceramic electrolyte is believed to be significantly affected by both, the AlPO4 secondary phase content and the ceramic electrolyte microstructure. It has been found that with increasing sintering temperature, the secondary-phase content of AlPO4 increased. For sintering temperatures above 1000[Formula: see text]C, the secondary phase has only a minor impact, and the ionic conductivity is predominantly determined by the microstructure of the pellet, i.e. the correlation between density, porosity and particle size. In that respect, it has been demonstrated, that the conductivity increases with increasing particle size in this temperature range and density.

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