Dendritic porous alumina with high porosity by directional freeze casting using a binary solution for bacterial removal

Zhu, Lixia; Tang, Yufei; Mao, Mengchen; Wu, Zixiang; Zhao, Kun

doi:10.1016/j.jeurceramsoc.2020.11.056

Cited by 18 publications

(10 citation statements)

References 36 publications

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“…When the ceramic content is 45 wt.%, the composite has a distinct lamellar structure with a width of fewer than 20 µm, along with relatively high porosity. We can observe the presence of pores of different sizes (dendrite‐like) on the lamellar structure as well 62 . This is formed by a sublimation of small curing crystals, accumulation of particles, removal of additives, and so on 63,64 .…”

Section: Resultsmentioning

confidence: 97%

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Rheological, mechanical, and electrical properties of Sr_0.7Bi_0.2TiO₃ modified BaTiO₃ ceramic and its composites

et al. 2023

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Porous BaTiO3‐based relaxor ferroelectric ceramics with lamellar structure were achieved by ice templating method, and the rheological properties of ceramic slurry for freeze casting were deeply studied. Epoxy resin was then backfilled to generate ceramic–epoxy resin composites. Ceramic–epoxy composites with a lamellar structure were obtained when using a slurry with a ceramic content of 45 wt.%. The nanoindentation results showed that the introduction of ceramic materials into the epoxy resin can significantly improve the penetration resistance and hardness of the material. The dielectric and ferroelectric properties of the composites were also characterized. The interaction between the highly coupled dipoles in the polymers results in a decrease in the breakdown field strength of the composite. The dielectric constant reached up to ∼800. At 220 kV/cm, Wrec = 0.62 J/cm3, and η was ∼80%. At low frequencies, Wrec was ∼0.16 J/cm3, which indicated good stability.

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Section: Resultsmentioning

confidence: 97%

“…We can observe the presence of pores of different sizes (dendrite-like) on the lamellar structure as well. 62 This is formed by a sublimation of small curing crystals, accumulation of particles, removal of additives, and so on. 63,64 The lamellar structure becomes less and less obvious with increasing ceramic content.…”

Section: Resultsmentioning

confidence: 99%

Rheological, mechanical, and electrical properties of Sr_0.7Bi_0.2TiO₃ modified BaTiO₃ ceramic and its composites

et al. 2023

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“…Finally, both sides of the disk samples were painted with silver and dried in an oven at 150 ℃ for 2 h. The samples were placed in an oil bath at 85 ℃ and poled for 30 minutes with a DC voltage of 1.5 kV mm -1 . [21]…”

Section: Materials Preparationmentioning

confidence: 99%

Preparation and properties of artificial bone with lead-free piezoelectric materials

Cheng¹

2023

MatLab

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In order to fabricate the artificial bone with high bioactive property, lead-free barium titanate (BaTiO3, BT) piezoelectric material added hydroxyapatite (HA) composites were prepared in this study. Compared with the pure HA materials, the introduction of BT can increase the electrical properties of the samples while ensuring good biological properties. The electrical properties, such as piezoelectric constant d33, hysteresis loop and dielectric spectrum were measured, respectively. The bending strength, Vickers hardness, cytotoxicity and osteogenic property of the BT/HA composites were also discussed. It is revealed that the non-toxic sample with 95 wt% BT and 5 wt% HA (95BT+5HA) has the best osteoinductivity, the piezoelectric constant d33 of which is 79.2 pC N-1. The bending strength and Vickers hardness of the 95BT+5HA sample are 138.3 MPa and 472.4, respectively, realizing the desired mechanical properties of human bones. Comprehensive analyses of various properties show that the 95BT+5HA composite can meet the requirements of artificial bone, and is expected to be a promising generation of substitute bone materials.

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“…Porous Al 2 O 3 ceramics are one of the most important ceramics owing to their excellent chemical stability, highspecific surface area and good thermal shock resistance and thus have found many applications in various industrial areas, such us membranes, catalyst supports, and gas filters. 1,2 Nowadays, various methods, including freeze casting, 3 direct foaming, 4 and gel casting, [5][6][7] have been developed to fabricate porous Al 2 O 3 ceramics. Amongst these methods, gel casting exhibits predominant advantages in the preparation of porous ceramics with complex shapes.…”

Section: Introductionmentioning

confidence: 99%

Preparation and properties of porous Al₂O₃‐based ceramics by gel casting using MgO as a gelling and consolidating agent

Piao

Tang

et al. 2022

Int J Applied Ceramic Tech

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Low-cost and environment-friendly MgO was used as a new gelling and consolidating agent to fabricate porous Al 2 O 3 -based ceramics via a gel casting routine. Effects of 800 • C calcined additions of MgO (.5, 1.0, 1.5, and 2.0 wt%, respectively) on open porosity (OP), pore size distribution, gas flux, and microstructure of the porous ceramics were investigated deliberately. The experimental results showed that 800 • C calcined MgO exhibits excellent gelling and consolidating performance at 80 • C, mainly owing to the hydration reaction between MgO and H 2 O and thus results in high-quality porous Al 2 O 3 -based ceramics without deformation and cracking. The Al 2 O 3 -water suspensions with different MgO additions have good flowability at room temperature. Moreover, water absorption, open porosity, and gas flux of the as-prepared porous ceramics increase remarkably with rising of MgO addition. Furthermore, MgO addition significantly suppresses the abnormal growth of Al 2 O 3 grains, and thus the microstructure of the porous Al 2 O 3 -based ceramics becomes more uniform. This technique of gel casting using MgO as a new gelling and consolidating agent offers an alternative routine for a large-scale production of porous ceramics.

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Dendritic porous alumina with high porosity by directional freeze casting using a binary solution for bacterial removal

Cited by 18 publications

References 36 publications

Rheological, mechanical, and electrical properties of Sr_0.7Bi_0.2TiO₃ modified BaTiO₃ ceramic and its composites

Rheological, mechanical, and electrical properties of Sr_0.7Bi_0.2TiO₃ modified BaTiO₃ ceramic and its composites

Preparation and properties of artificial bone with lead-free piezoelectric materials

Preparation and properties of porous Al₂O₃‐based ceramics by gel casting using MgO as a gelling and consolidating agent

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Dendritic porous alumina with high porosity by directional freeze casting using a binary solution for bacterial removal

Cited by 18 publications

References 36 publications

Rheological, mechanical, and electrical properties of Sr0.7Bi0.2TiO3 modified BaTiO3 ceramic and its composites

Rheological, mechanical, and electrical properties of Sr0.7Bi0.2TiO3 modified BaTiO3 ceramic and its composites

Preparation and properties of artificial bone with lead-free piezoelectric materials

Preparation and properties of porous Al2O3‐based ceramics by gel casting using MgO as a gelling and consolidating agent

Contact Info

Product

Resources

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Rheological, mechanical, and electrical properties of Sr_0.7Bi_0.2TiO₃ modified BaTiO₃ ceramic and its composites

Rheological, mechanical, and electrical properties of Sr_0.7Bi_0.2TiO₃ modified BaTiO₃ ceramic and its composites

Preparation and properties of porous Al₂O₃‐based ceramics by gel casting using MgO as a gelling and consolidating agent