scholarly journals Crystallization Behavior of the Low-Temperature Mineralization Sintering Process for Glass Nanoparticles

Materials ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3281
Author(s):  
Yeongjun Seo ◽  
Tomoyo Goto ◽  
Sunghun Cho ◽  
Tohru Sekino
Keyword(s):  
Low Temperature ◽  
Crystallization Behavior ◽  
Sol Gel ◽  
Hydrothermal Condition ◽  
Uniaxial Pressure ◽  
Sintering Process ◽  
Bioactive Glasses ◽  
Sol Gel Process ◽  
Sbf Solution ◽  
Lower Temperature

Bioactive glasses are promising materials for various applications, such as bone grafts and implants. The development of sintering techniques for bioactive glasses is one of the most important ways to expand the application to biomaterials. In this paper, we demonstrate the low-temperature mineralization sintering process (LMSP) of glass nanoparticles and their crystallization behavior. LMSP is a novel process employed to densify glass nanoparticles at an extremely low temperature of 120 °C. For this new approach, the hydrothermal condition, mineralization, and the nanosize effect are integrated into LMSP. To induce mineralization in LMSP, bioactive glass nanoparticles (BGNPs, 55SiO2-40CaO-5P2O5, mol%), prepared by the sol-gel process, were mixed with a small amount of simulated body fluid (SBF) solution. As a result, 93% dense BGNPs were realized under a temperature of 120 °C and a uniaxial pressure of 300 MPa. Due to the effect of mineralization, crystalline hydroxyapatite (HAp) was clearly formed at the boundaries of BGNPs, filling particles and interstitials. As a result, the relative density was remarkably close to that of the BGNPs conventionally sintered at 1050 °C. Additionally, the Vickers hardness value of LMSP samples varied from 2.10 ± 0.12 GPa to 4.28 ± 0.11 GPa, and was higher than that of the BGNPs conventionally sintered at 850 °C (2.02 ± 0.11 GPa). These results suggest that, in addition to LMSP being an efficient densification method for obtaining bulk bioactive glasses at a significantly lower temperature level, this process has great potential for tissue engineering applications, such as scaffolds and implants.

Synthesis and Characterization of Y3Al5O12 Nanocrystals

2007 ◽  
Vol 26-28 ◽  
pp. 667-670 ◽  
Author(s):  
K.S. Bartwal ◽  
S. Kar ◽  
N. Kaithwas ◽  
M. Deshmukh ◽  
M. Dave ◽  
...  
Keyword(s):  
Low Temperature ◽  
Single Phase ◽  
Sol Gel ◽  
Aqueous Media ◽  
Host Materials ◽  
Sol Gel Process ◽  
Crystallite Sizes ◽  
Wet Chemical ◽  
Lower Temperature

Y3Al5O12 (YAG) is one of the important and extensively used solid state laser host materials. YAG nanocrystals were synthesized by low temperature glycol method. This is a modified sol–gel method performed at low temperature that consists of a mixture of salts, mostly nitrates in an aqueous media. Single phase nanocrystalline YAG was obtained at 850 °C, which is lower temperature compared to the other methods such as wet-chemical method. This is however, little higher than the material made by alkoxide sol–gel process. The structural characterization is done by powder XRD, SEM and TEM techniques. The crystallite sizes range from 20-50 nm for the materials prepared at 850- 950 °C.

Low temperature crystallization behavior of TiO2 derived from a sol–gel process

2007 ◽  
Vol 42 (2) ◽  
pp. 107-117 ◽  
Author(s):  
Judy N. Hart ◽  
Laure Bourgeois ◽  
Raoul Cervini ◽  
Yi-Bing Cheng ◽  
George P. Simon ◽  
...  
Keyword(s):  
Low Temperature ◽  
Crystallization Behavior ◽  
Sol Gel ◽  
Sol Gel Process ◽  
Low Temperature Crystallization ◽  
Temperature Crystallization

Low temperature mullitization of oxime-modified aluminosiloxane by sol-gel process

2021 ◽  
pp. 1-9
Author(s):  
Ajay Saini ◽  
Dalip Singh ◽  
Banwari Lal Choudhary ◽  
Veena Dhayal
Keyword(s):  
Low Temperature ◽  
Sol Gel ◽  
Sol Gel Process

Low temperature synthesis of ultrafine α-Al2O3 powder by a simple aqueous sol–gel process

2006 ◽  
Vol 32 (5) ◽  
pp. 587-591 ◽  
Author(s):  
Jiang Li ◽  
Yubai Pan ◽  
Changshu Xiang ◽  
Qiming Ge ◽  
Jingkun Guo
Keyword(s):  
Low Temperature ◽  
Sol Gel ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis ◽  
Al2o3 Powder ◽  
Sol Gel Process ◽  
Α Al2o3

scholarly journals Mechanically robust, thermally stable, highly transparent superhydrophobic coating with low-temperature sol–gel process

RSC Advances ◽  
2017 ◽  
Vol 7 (75) ◽  
pp. 47357-47365 ◽  
Author(s):  
Yanping Zhang ◽  
Binghai Dong ◽  
Shimin Wang ◽  
Li Zhao ◽  
Li Wan ◽  
...  
Keyword(s):  
Low Temperature ◽  
Daily Life ◽  
Sol Gel ◽  
Superhydrophobic Surfaces ◽  
Thermally Stable ◽  
Superhydrophobic Coating ◽  
Engineering Applications ◽  
Wetting Behavior ◽  
Sol Gel Process

The wetting behavior of transparent superhydrophobic surfaces has attracted much attention in our daily life as well as in engineering applications.

Texture Evaluation of Sol-Gel Derived Mesoporous Bioactive Glass

2013 ◽  
Vol 284-287 ◽  
pp. 230-234
Author(s):  
Yu Jen Chou ◽  
Chi Jen Shih ◽  
Shao Ju Shih
Keyword(s):  
Surface Area ◽  
Calcination Temperature ◽  
High Surface ◽  
Sol Gel ◽  
High Surface Area ◽  
Nitrogen Adsorption ◽  
Bioactive Glasses ◽  
Transmission Electron ◽  
Sol Gel Process ◽  
Adsorption Desorption

Recent years mesoporous bioactive glasses (MBGs) have become important biomaterials because of their high surface area and the superior bioactivity. Various studies have reported that when MBGs implanted in a human body, hydroxyl apatite layers, constituting the main inorganic components of human bones, will form on the MBG surfaces to increase the bioactivity. Therefore, MBGs have been widely applied in the fields of tissue regeneration and drug delivery. The sol-gel process has replaced the conventional glasses process for MBG synthesis because of the advantages of low contamination, chemical flexibility and lower calcination temperature. In the sol-gel process, several types of surfactants were mixed with MBG precursor solutions to generate micelle structures. Afterwards, these micelles decompose to form porous structures after calcination. Although calcination is significant for contamination, crystalline and surface area in MBG, to the best of the authors’ knowledge, only few systematic studies related to calcination were reported. This study correlated the calcination parameters and the microstructure of MBGs. Microstructure evaluation was characterized by transmission electron microscopy and nitrogen adsorption/desorption. The experimental results show that the surface area and the pore size of MBGs decreased with the increasing of the calcination temperature, and decreased dramatically at 800°C due to the formation of crystalline phases.

Superconducting YBa2Cu3O7−x materials prepared at low temperature by sol-gel process

1988 ◽  
Vol 7 (5-6) ◽  
pp. 182-184 ◽  
Author(s):  
Zheng Haixing ◽  
J.D. Mackenzie
Keyword(s):  
Low Temperature ◽  
Sol Gel ◽  
Sol Gel Process

Low Temperature Preparation of Mullite Whisker via Non-Hydrolytic Sol-Gel Process Combined with Molten Salt Method

2014 ◽  
Vol 936 ◽  
pp. 975-980 ◽  
Author(s):  
Kai Lin Fu ◽  
Wei Hui Jiang ◽  
Guo Feng ◽  
Jian Min Liu ◽  
Qian Wu ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Low Temperature ◽  
Molten Salt ◽  
Sol Gel ◽  
Growth Direction ◽  
Treatment Temperature ◽  
Molten Salt Method ◽  
Low Temperature Preparation ◽  
Sol Gel Process ◽  
Temperature Preparation

Mullite whisker was prepared at low temperature via non-hydrolytic sol-gel (NHSG) process combined with molten salt method. The influence of heat treatment temperature was studied on the morphology and the microstructure of whisker, and its growth mechanism was also described. The results show that the mullite whisker appears at the lowest temperature of 750 °C, and optimized mullite whisker can be prepared at 850 °C with the growth direction of [00, whose diameter is in the range of 170~300 nm with the aspect ratio of >30.

Preparation of Nanoporous Titania Films by Surface Sol−Gel Process Accompanied by Low-Temperature Oxygen Plasma Treatment

Langmuir ◽  
2002 ◽  
Vol 18 (23) ◽  
pp. 9048-9053 ◽  
Author(s):  
Jianguo Huang ◽  
Izumi Ichinose ◽  
Toyoki Kunitake ◽  
Aiko Nakao
Keyword(s):  
Low Temperature ◽  
Plasma Treatment ◽  
Oxygen Plasma ◽  
Sol Gel ◽  
Oxygen Plasma Treatment ◽  
Sol Gel Process ◽  
Titania Films
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