Synthesis of Porous Ceramics with Complex Pore Structure by Freeze‐Dry Processing

Fukasawa, Tomonori; Ando, Motohide; Ohji, Tatsuki; Kanzaki, Shuzo

doi:10.1111/j.1151-2916.2001.tb00638.x

Cited by 392 publications

(294 citation statements)

References 5 publications

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“…Ultrastable wet foams can be produced by direct foaming using particles instead of surfactants as foams stabilizers [16,19,25]. Porous ceramics' properties are also highly influenced by their chemical compositions and microstructures, with porosity, pore morphology, and size distribution being tailored by different compositions, different physical structures of the starting materials, and the use of different amphiphiles [30][31][32][33][34][35][36]. This review focuses on this process.…”

Section: Direct Foamingmentioning

confidence: 99%

“…Several physical processes can occur to decrease the overall free energy and destabilize the foam [36]. Drainage occurs through gravity; light gas bubbles rise forming a denser foam layer, while the heavier liquid phase is concentrated below.…”

Section: Wet Foam Stabilitymentioning

confidence: 99%

“…Since this method produces a ceramic to the negative of the original template, the removal of the sacrificial phase does not lead to flaws in the struts as can occur using positive replicas. The microstructures obtained by this technique reflect directly the pattern of the sacrificial phase and higher mechanical strengths are generally achievable than by using positive replicas [36,37].…”

Section: Sacrificial Templatesmentioning

confidence: 99%

See 2 more Smart Citations

Porous Ceramics

Sarkar¹,

Kim²

2015

Advanced Ceramic Processing

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The unique chemical composition and microstructure of porous ceramics enable the ceramic products used in a number of applications such as filtration of molten metals and hot corrosive gases, high-temperature thermal insulation, support for catalytic reactions, filtration of diesel engine exhaust gases, etc. These applications take advantage of special characteristics of porous ceramics such as low thermal mass, low thermal conductivity, controlled permeability, high surface area, low density, and high specific strength. In this chapter, we emphasize on direct foaming method, a simple and versatile approach that allows fabrication of porous ceramics with tailored microstructure along with distinctive properties. Foam stability is achieved upon controlled addition of amphiphiles to the colloidal suspension, which induce in situ hydrophobization, allowing the wet foam to resist coarsening upon drying and sintering.

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Section: Direct Foamingmentioning

confidence: 99%

Section: Wet Foam Stabilitymentioning

confidence: 99%

Section: Sacrificial Templatesmentioning

confidence: 99%

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Porous Ceramics

Sarkar¹,

Kim²

2015

Advanced Ceramic Processing

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“…Lamellar alumina scaffolds were fabricated in bulk form by freeze-casting (Fukasawa et al 2001;Araki & Halloran 2004;Deville et al 2006;Deville 2008;Waschkies et al 2009) a water-based suspension of sub-micrometre alumina powder (solid content 50 wt%). Sucrose (4 wt%) was added to the suspension in order to ensure the formation of fine ceramic lamellae with a characteristic microscopic roughness ).…”

Section: Processing and Sample Preparationmentioning

confidence: 99%

A novel biomimetic approach to the design of high-performance ceramic–metal composites

Launey

Munch

Alsem

et al. 2009

J. R. Soc. Interface.

249

121

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The prospect of extending natural biological design to develop new synthetic ceramicmetal composite materials is examined. Using ice-templating of ceramic suspensions and subsequent metal infiltration, we demonstrate that the concept of ordered hierarchical design can be applied to create fine-scale laminated ceramic -metal (bulk) composites that are inexpensive, lightweight and display exceptional damage-tolerance properties. Specifically, Al 2 O 3 /Al -Si laminates with ceramic contents up to approximately 40 vol% and with lamellae thicknesses down to 10 mm were processed and characterized. These structures achieve an excellent fracture toughness of 40 MPa p m at a tensile strength of approximately 300 MPa. Salient toughening mechanisms are described together with further toughening strategies.

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“…By varying the thermal gradients and freezing rate, ice crystal can solidify unidirectionally from the solution during the freezing process. Ice removal by lyophilization generates a unidirectional porous structure [19], [20]. TBA is a widely used co-solvent…”

Section: Introductionmentioning

confidence: 99%

Preparation Chitosan Lactate-Hyaluronate Sponges with Unidirectional Porous Structure and Their Potential Use as Wound Dressings

Lai¹

2014

IJBBB

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Abstract-Sponges were prepared from lactic acid-grafted chitosan (LCH) and hyaluronate (HA) to develop potential materials for wound dressing. Sponges with different microstructures can be obtained in a vertical temperature-controlled device and in an aluminum vessel. The morphology and permeability properties, including porosity, water permeability, gas permeability, water adsorption and in vitro biodegradation of two types of sponges were compared in detail. Sponges with microtubule-oriented structure can be obtained in a vertical temperature-controlled device with TBA (tertiary butyl alcohol). These sponges exhibited an applicable water permeation rate of 577 g•m -2 •day -1 and higher air permeability tensor of 3 × 10 -12 . The sponges with random micropores can be prepared in an aluminum vessel. These sponges exhibited a water permeation rate and an air permeability tensor of 452 g•m -2 •day -1 and 1.8 × 10 -14 g•m -2 •day -1 , respectively. These results also indicated that TBA greatly affected the microstructure of the resulting sponges. A parallel orientation of the pore structure resulted in higher porosity and higher water adsorption capacity than random pores. After lactic acid was grafted, the crystallinity of chitosan decreased and water solubility increased, causing rapid lysozymatic degradation of chitosan lactate-HA sponges. The resulting sponges exhibited high water content, gas permeability and appropriate water permeation; such sponges could easily be applied and removed. These properties indicated that these materials are highly applicable as wound dressing.Index Terms-Chitosan lactate, hyaluronate, sponge.

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Synthesis of Porous Ceramics with Complex Pore Structure by Freeze‐Dry Processing

Cited by 392 publications

References 5 publications

Porous Ceramics

Porous Ceramics

A novel biomimetic approach to the design of high-performance ceramic–metal composites

Preparation Chitosan Lactate-Hyaluronate Sponges with Unidirectional Porous Structure and Their Potential Use as Wound Dressings

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