Highly porous hydroxyapatite bioceramics with interconnected pore channels using camphene-based freeze casting

This paper adopted freeze casting method to prepare porous Al2O3ceramic bodies with interconnected pore channels as a preform. The preform was pressureless infiltrated with Nb-Al binary alloy by using electromagnetic induction furnace. The results indicated that the Nb-Al melt solidified as a sphere-like body under the surface tension driving. It was difficult to obtain Nb-Al binary alloy matrix Al2O3ceramic composites. However, the wettability between Nb-Al melt and porous Al2O3ceramic bodies was improved obviously while the Ti and Cr alloying elements were added into Nb-Al binary alloy. Also, the resultant Nb-35Ti-20Al-10Cr melt was filled into the interconnected pore channels existed in the Al2O3preform by pressureless infiltration.

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Influence of the calcination temperature on morphological and mechanical properties of highly porous hydroxyapatite scaffolds

Ceramics International ◽

10.1016/j.ceramint.2012.11.076 ◽

2013 ◽

Vol 39 (5) ◽

pp. 4839-4846 ◽

Cited By ~ 51

Author(s):

F. Scalera ◽

F. Gervaso ◽

K.P. Sanosh ◽

A. Sannino ◽

A. Licciulli

Keyword(s):

Mechanical Properties ◽

Calcination Temperature ◽

Porous Hydroxyapatite ◽

Highly Porous

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Highly Porous Hydroxyapatite Ceramics for Engineering Applicatios

Advances in Science and Technology ◽

10.4028/www.scientific.net/ast.63.408 ◽

2010 ◽

Vol 63 ◽

pp. 408-413 ◽

Cited By ~ 7

Author(s):

Hrvoje Ivankovic ◽

Sebastijan Orlic ◽

Dajana Kranzelic ◽

Emilija Tkalcec

Keyword(s):

Average Length ◽

Average Diameter ◽

Ftir Analysis ◽

X Ray Diffraction ◽

Gas Cell ◽

Porous Hydroxyapatite ◽

Hydroxyapatite Ceramics ◽

Heat Treated ◽

Hydrothermal Transformation ◽

Highly Porous

Highly porous hydroxyapatite (Ca10(PO4)6(OH)2, HA) was prepared through hydrothermal (HT) transformation of aragonitic cuttlefish bones (Seppia Officinalis L. Adriatic Sea) in the temperature range from 140°C to 220°C for 20 minutes to 48 hours. Mechanism of hydrothermal transformation of bones was investigated by DTA/TG analyzer coupled online with FTIR spectrometric gas cell equipment (DTA-TG-EGA-FTIR analysis), X-ray diffraction analysis (XRD) and scanning electron microscopy (SEM). DTA-TG-EGA-FTIR analysis have shown the release of CO2 at about 400°C, 680°C and 990°C. The first release could be attributed to organics not completely removed from the heat treated bones, and the second release to decomposition of unconverted aragonite, whereas, the third one could be attributed to CO3 2– groups incorporated in the structure of HA. The interconnecting porous morphology of the starting material (aragonite) was maintained during the HT treatment. The formation of dandelion-like HA spheres with diameter from 3 to 8 μm were observed, which further transformed into nanoplates and nanorods with an average diameter of about 200-300 nm and an average length of about 8-10 μm.

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The Production of Porous Hydroxyapatite Scaffolds with Graded Porosity by Sequential Freeze-Casting

Materials ◽

10.3390/ma10040367 ◽

2017 ◽

Vol 10 (4) ◽

pp. 367 ◽

Cited By ~ 18

Author(s):

Hyun Lee ◽

Tae-Sik Jang ◽

Juha Song ◽

Hyoun-Ee Kim ◽

Hyun-Do Jung

Keyword(s):

Freeze Casting ◽

Porous Hydroxyapatite

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Weibull modulus and fracture strength of highly porous hydroxyapatite

Journal of the Mechanical Behavior of Biomedical Materials ◽

10.1016/j.jmbbm.2013.01.031 ◽

2013 ◽

Vol 20 ◽

pp. 283-295 ◽

Cited By ~ 23

Author(s):

X. Fan ◽

E.D. Case ◽

I. Gheorghita ◽

M.J. Baumann

Keyword(s):

Fracture Strength ◽

Weibull Modulus ◽

Porous Hydroxyapatite ◽

Highly Porous

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Reverse freeze casting: A new method for fabricating highly porous titanium scaffolds with aligned large pores

Acta Biomaterialia ◽

10.1016/j.actbio.2012.03.020 ◽

2012 ◽

Vol 8 (6) ◽

pp. 2401-2410 ◽

Cited By ~ 56

Author(s):

Se-Won Yook ◽

Hyun-Do Jung ◽

Chang-Hoon Park ◽

Kwan-Ha Shin ◽

Young-Hag Koh ◽

...

Keyword(s):

Porous Titanium ◽

New Method ◽

Freeze Casting ◽

Highly Porous

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Highly Porous Hydroxyapatite/Graphene Oxide/Chitosan Beads as an Efficient Adsorbent for Dyes and Heavy Metal Ions Removal

Molecules ◽

10.3390/molecules26206127 ◽

2021 ◽

Vol 26 (20) ◽

pp. 6127

Author(s):

Nguyen Van Hoa ◽

Nguyen Cong Minh ◽

Hoang Ngoc Cuong ◽

Pham Anh Dat ◽

Pham Viet Nam ◽

...

Keyword(s):

Heavy Metal ◽

Graphene Oxide ◽

Metal Ion ◽

Copper Ions ◽

High Porosity ◽

Step Method ◽

Sem Images ◽

Chitosan Beads ◽

Porous Hydroxyapatite ◽

Highly Porous

Dye and heavy metal contaminants are mainly aquatic pollutants. Although many materials and methods have been developed to remove these pollutants from water, effective and cheap materials and methods are still challenging. In this study, highly porous hydroxyapatite/graphene oxide/chitosan beads (HGC) were prepared by a facile one-step method and investigated as efficient adsorbents. The prepared beads showed a high porosity and low bulk density. SEM images indicated that the hydroxyapatite (HA) nanoparticles and graphene oxide (GO) nanosheets were well dispersed on the CTS matrix. FT-IR spectra confirmed good incorporation of the three components. The adsorption behavior of the obtained beads to methylene blue (MB) and copper ions was investigated, including the effect of the contact time, pH medium, dye/metal ion initial concentration, and recycle ability. The HGC beads showed rapid adsorption, high capacity, and easy separation and reused due to the porous characteristics of GO sheets and HA nanoparticles as well as the rich negative charges of the chitosan (CTS) matrix. The maximum sorption capacities of the HGC beads were 99.00 and 256.41 mg g−1 for MB and copper ions removal, respectively.

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