Sintering behavior and property of bioglass modified HA-Al2O3 composite

The bioglass modified HA-Al2O3 composites were successfully fabricated by mixing HA, synthesized by wet chemical method between precursor materials H3PO4 and Ca(OH)2, with 25wt% Al2O3 and different content of bioglass (5%, 25%, 45%, 65wt%) respectively, with a mole fraction of 53.9%SiO2, 22.6%Na2O, 21.8%CaO, and 1.7wt%P2O5, sintered in air at various temperatures (750-950?C) for 2h. when the content of bioglass is below 45wt% in the composite, HA decomposes completely and transforms to ?-TCP. The main phase in this case are ?-TCP, Al2O3 and Ca3(AlO3)2.When the content of bioglass is above 45wt% in the composite, the decomposition of HA to ?-TCP is suppressed and the main phases in this case are Al2O3 and HA, DCP?CaHPO4? and ?-TCP, which almost have the same chemical composition, forming ternary-glass phase, and have better bioactive than pure HA. It can also be found that at the certain addition of bioglass, the higher sintered temperature, the bigger volume density and flexural strength of the composite are, but when the sintered temperature reaches 950?C, they decrease. This modified HA-Al2O3 composites by calcium silicate glass have a much lower sintering temperature and decrease the production cost much.

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Electrophoretic Deposition of Hydroxyapatite Nano Coating on Etched Titanium Surface

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.288-289.183 ◽

2005 ◽

Vol 288-289 ◽

pp. 183-186 ◽

Cited By ~ 6

Author(s):

F. Chen ◽

L.W. Lin ◽

Chang Jian Lin ◽

W.W. Lu

Keyword(s):

Mechanical Properties ◽

Electrophoretic Deposition ◽

Chemical Method ◽

Titanium Surface ◽

Sintering Temperature ◽

Deposition Process ◽

Wet Chemical Method ◽

Nano Structure ◽

Nano Coating ◽

Wet Chemical

Hydroxyapatite (Ca10(PO4)6(OH)2, HAp) is biocompatible and bioactive, however, it is relatively brittle. The development of HAp coatings on medical metal surface is a good way to improve the mechanical properties of HAp. In the present study, a HAp coating with nano-structure on a roughened titanium surface was developed by electrophoretic deposition process. To decrease sintering temperature HAp nanoparticles synthesized by a wet chemical method was used. It was observed that the coating was uniform and showed no cracks. After sintering the HAp coating still remained nano structured. The surface treatment of Ti was applied to form a distribution of small pits and a TiO2 thin layer on the Ti surface that improves the adhesion of coating to the Ti substrate. It was shown that the bonding strength of coating was 18 ± 2.5MPa. The hardness and Young’s modulus were 40.6 and 0.42 GPa, respectively.

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Synthesis, Sintering and Microstructural Characterization of Nanocrystalline Hydroxyapatite Composites

MRS Proceedings ◽

10.1557/proc-845-aa5.31 ◽

2004 ◽

Vol 845 ◽

Cited By ~ 1

Author(s):

B. Viswanath ◽

N. Ravishankar ◽

Suprabha Nayar ◽

Arvind Sinha

Keyword(s):

Mechanical Properties ◽

Chemical Method ◽

Sintering Temperature ◽

Microstructural Characterization ◽

Wet Chemical Method ◽

Maximum Value ◽

Nanocrystalline Hydroxyapatite ◽

Wet Chemical ◽

Nanocrystalline Alumina

ABSTRACTNanocrystalline hydroxyapatite (HAp) exhibits better bioactivity and biocompatibility with enhanced mechanical properties compared to the microcrystalline counterpart. In the present work, nanocrystalline hydroxyapatite was synthesized by wet chemical method. Sintering was carried out with nanocrystalline alumina as additive, the content of alumina being varied from 10 to 30 wt% in the composite. For 20 and 30 wt % Al2O3, hydroxyapatite decomposed into tricalcium phosphate (TCP) above the sintering temperature of 1100°C. The fracture toughness of nano HAp-nano Al2O3 composite is anisotropic in nature and reached a maximum value of 6.9 MPa m1/2.

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Sintering Behavior of Nanocrystalline Hydroxyapatite Produced by Wet Chemical Method

Current Nanoscience ◽

10.2174/157341311798220538 ◽

2011 ◽

Vol 7 (6) ◽

pp. 845-849 ◽

Cited By ~ 2

Author(s):

S. Ramesh ◽

R. Tolouei ◽

M. Hamdi ◽

J. Purbolaksono ◽

C. Y. Tan ◽

...

Keyword(s):

Chemical Method ◽

Sintering Behavior ◽

Wet Chemical Method ◽

Nanocrystalline Hydroxyapatite ◽

Wet Chemical

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Crystallization Characteristics and Microstructure of Yttria-Stabilized Zirconia / Hydroxyapatite Composite

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.197-198.160 ◽

2011 ◽

Vol 197-198 ◽

pp. 160-163

Author(s):

Li Li Wang ◽

Xiu Feng Wang ◽

Jian Feng Zhu ◽

Cheng Long Yu

Keyword(s):

Chemical Method ◽

Raw Materials ◽

Biological Properties ◽

Yttria Stabilized Zirconia ◽

Stabilized Zirconia ◽

Wet Chemical Method ◽

Composite Powders ◽

Hydroxyapatite Composite ◽

Wet Chemical ◽

Sintered Temperature

Good crystallized Hydroxyapatite was synthesized using H3PO4 and Ca(OH)2 as raw materials by wet chemical method and sintered at 800°C for 3h. The as-prepared HA powders were mixed with 15%, 20%, 25% yttria-stabilized m-ZrO2, respectively, and sintered at 900°C- 1200°C for 1h, respectively. The main phases and rules of phases changing with the content of yttria-stabilized m-ZrO2 and sintered temperature was investigated by XRD and the microstructure features of the composite powders were analysed by scanning electron microscopy. The results show that when the temperature is at 1000°C, HA starts to decompose to β-TCP and CaO, the m-ZrO2 is then partly converted into t-ZrO2 by partial consumption of CaO, which in turn results in a mixture of β-TCP and HA further. The CaO produced reacts further with m-ZrO2 generating a mixture of t-ZrO2 and CaZrO3 in different proportions. The microstructure of the HA-ZrO2 composite further indicates that when sintered at 1000°C for 1h, gray slice area represent a mixture of HA and a small amount of β-TCP. While in the white area, some spheric ZrO2 mixed with a negligible amount of CaO. When sintered at 1200°C, distinguished reduced spherical ZrO2 particles embed within mixed HA and β-TCP, which change from slice to agglomeration. As a result, when the sintered temperature is about 1000°C and the addition of m-ZrO2 reaches 20wt%, superior main phases are HA and t-ZrO2, which improves the combination of mechanical and biological properties.

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Impact of LiTi2(PO4)3 coating on the electrochemical performance of Li1.2Ni0.13Mn0.54Co0.13O2 using a wet chemical method

Ionics ◽

10.1007/s11581-021-03946-w ◽

2021 ◽

Vol 27 (4) ◽

pp. 1465-1475

Author(s):

Ning Zhang ◽

Ying Li ◽

Yadan Luo ◽

Zhen Yang ◽

Jiayao Lu

Keyword(s):

Electrochemical Performance ◽

Chemical Method ◽

Wet Chemical Method ◽

Wet Chemical

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Synthesis of maghemite (γ-Fe2O3) nanoparticles by wet chemical method at room temperature

Materials Letters ◽

10.1016/j.matlet.2010.03.064 ◽

2010 ◽

Vol 64 (13) ◽

pp. 1471-1472 ◽

Cited By ~ 75

Author(s):

Esmaeel Darezereshki

Keyword(s):

Chemical Method ◽

Room Temperature ◽

Fe2o3 Nanoparticles ◽

Wet Chemical Method ◽

Wet Chemical

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Hybrids of cobalt nanochains and polyvinylidene fluoride with enhanced microwave absorption performance

RSC Advances ◽

10.1039/c6ra10722b ◽

2016 ◽

Vol 6 (60) ◽

pp. 55546-55551 ◽

Cited By ~ 6

Author(s):

Shu-Qing Lv ◽

Ya-Fei Pan ◽

Pei-Bo Yang ◽

Guang-Sheng Wang

Keyword(s):

Microwave Absorption ◽

Polyvinylidene Fluoride ◽

Chemical Method ◽

Wet Chemical Method ◽

Absorption Properties ◽

Flexible Film ◽

Absorption Performance ◽

Wet Chemical ◽

Microwave Absorption Performance

By using a simple wet chemical method and hot-molding procedure, a kind of flexible film with enhance absorption properties based on binary cobalt nanochains/polyvinylidene fluoride (PVDF) hybrids has been successfully fabricated.

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Development of a wet chemical method for the synthesis of arrayed ZnO nanorods

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2010.03.235 ◽

2010 ◽

Vol 500 (2) ◽

pp. L17-L21 ◽

Cited By ~ 35

Author(s):

Shao-Hwa Hu ◽

Yi-Chuan Chen ◽

Chyi-Ching Hwang ◽

Cheng-Hsiung Peng ◽

Dah-Chuan Gong

Keyword(s):

Chemical Method ◽

Zno Nanorods ◽

Wet Chemical Method ◽

Wet Chemical

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Characterization of ferrite nanoparticles for preparation of biocomposites

Beilstein Journal of Nanotechnology ◽

10.3762/bjnano.8.127 ◽

2017 ◽

Vol 8 ◽

pp. 1257-1265 ◽

Cited By ~ 7

Author(s):

Urszula Klekotka ◽

Magdalena Rogowska ◽

Dariusz Satuła ◽

Beata Kalska-Szostko

Keyword(s):

Chemical Method ◽

Ferrite Nanoparticles ◽

Chemical Activity ◽

Nominal Composition ◽

X Ray Diffraction ◽

Wet Chemical Method ◽

X Ray ◽

Transmission Electron ◽

Wet Chemical

Ferrite nanoparticles with nominal composition Me0.5Fe2.5O4 (Me = Co, Fe, Ni or Mn) have been successfully prepared by the wet chemical method. The obtained particles have a mean diameter of 11–16 ± 2 nm and were modified to improve their magnetic properties and chemical activity. The surface of the pristine nanoparticles was functionalized afterwards with –COOH and –NH2 groups to obtain a bioactive layer. To achieve our goal, two different modification approaches were realized. In the first one, glutaraldehyde was attached to the nanoparticles as a linker. In the second one, direct bonding of such nanoparticles with a bioparticle was studied. In subsequent steps, the nanoparticles were immobilized with enzymes such as albumin, glucose oxidase, lipase and trypsin as a test bioparticles. The characterization of the nanoparticles was acheived by transmission electron microscopy, X-ray diffraction, energy dispersive X-ray and Mössbauer spectroscopy. The effect of the obtained biocomposites was monitored by Fourier transform infrared spectroscopy. The obtained results show that in some cases the use of glutaraldehyde was crucial (albumin).

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