Control of pore channel size during freeze casting of porous YSZ ceramics with unidirectionally aligned channels using different freezing temperatures

Hu, Liangfa; Wang, Chang‐An; Huang, Yong; Sun, Chencheng; Lu, S. H.; Hu, Zhiqiang

doi:10.1016/j.jeurceramsoc.2010.07.032

Cited by 143 publications

(72 citation statements)

References 23 publications

(22 reference statements)

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“…During cooling, the dispersant freezes and thus segregates from the particle-rich domains 166 and acts as a macroporogen, which is finally removed by sublimation. Next to aqueous suspensions, freeze casting based on organic dispersants, such as tert-butylalcohol, [167][168][169] camphene 170 or 1,4-dioxane 171 has been reported in the literature. The pores generated by the freeze casting technique are usually in the range of 1 mm up to several hundreds of micrometres.…”

Section: Zeolitic Monoliths Via Freeze Castingmentioning

confidence: 99%

“…172 The pore morphology strongly depends upon the dispersant and its crystallisation behaviour during freezing at the given temperature. Exemplarily, for water as initial dispersant, lamellar pores have been found, 173 while for camphene Hu et al 169 reported channels of rather hexagonal cross sectional area.…”

Section: Zeolitic Monoliths Via Freeze Castingmentioning

confidence: 99%

“…168 Once frozen, the ice-template has to be removed by sublimation which usually is performed via freeze drying in vacuum. 169 Subsequently, the obtained 'green body' has to be consolidated via a final solidification step (e.g. via sintering 167 ).…”

Section: Zeolitic Monoliths Via Freeze Castingmentioning

confidence: 99%

“…In contrast to hard templating methods discussed in Section 3.1, here, the hard template (frozen dispersant) is formed in situ via a temperature induced phase separation, which is the same underlying preparation principle as in the case of porous glass. Nevertheless, compared to the other hard templating methods, the freeze casting technique offers not only the possibility to tailor the direction of the pores, the pore size distribution and its gradient along the freezing direction, 169 but also e.g. the porosity 176 of the resulting solid by adjusting the process parameters such as temporal and spatial temperature profile and the solid concentration.…”

Section: Zeolitic Monoliths Via Freeze Castingmentioning

confidence: 99%

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Hierarchy concepts: classification and preparation strategies for zeolite containing materials with hierarchical porosity

et al. 2016

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'Hierarchy' is a property which can be attributed to a manifold of different immaterial systems, such as ideas, items and organisations or material ones like biological systems within living organisms or artificial, man-made constructions. The property 'hierarchy' is mainly characterised by a certain ordering of individual elements relative to each other, often in combination with a certain degree of branching.Especially mass-flow related systems in the natural environment feature special hierarchically branched patterns. This review is a survey into the world of hierarchical systems with special focus on hierarchically porous zeolite materials. A classification of hierarchical porosity is proposed based on the flow distribution pattern within the respective pore systems. In addition, this review might serve as a toolbox providing several synthetic and post-synthetic strategies to prepare zeolitic or zeolite containing material with tailored hierarchical porosity. Very often, such strategies with their underlying principles were developed for improving the performance of the final materials in different technical applications like adsorptive or catalytic processes. In the present review, besides on the hierarchically porous allzeolite material, special focus is laid on the preparation of zeolitic composite materials with hierarchical porosity capable to face the demands of industrial application.

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Section: Zeolitic Monoliths Via Freeze Castingmentioning

confidence: 99%

Section: Zeolitic Monoliths Via Freeze Castingmentioning

confidence: 99%

Section: Zeolitic Monoliths Via Freeze Castingmentioning

confidence: 99%

Section: Zeolitic Monoliths Via Freeze Castingmentioning

confidence: 99%

See 2 more Smart Citations

Hierarchy concepts: classification and preparation strategies for zeolite containing materials with hierarchical porosity

et al. 2016

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“…The important factors to be considered are pre-treatment to disaggregate the ceramic particles, suitable solids concentration and good dispersion of the ceramic particles in the slurry by the use of appropriate organic dispersants. On the other hand, a pore size gradient may intentionally be introduced by accelerating the evaporation of the solvent from the open upper surface of the slurry using a highly volatile organic solvent such as an alcohol [51]. Tert-butyl alcohol (TBA) generates unique unidirectional pores with hexagonal cross sections depending on the structure of the hexamers in the frozen TBA [51].…”

Section: Unidirectional Freezingmentioning

confidence: 99%

Porous ceramics mimicking nature—preparation and properties of microstructures with unidirectionally oriented pores

Okada

Isobe

Katsumata

et al. 2011

Science and Technology of Advanced Materials

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Porous ceramics with unidirectionally oriented pores have been prepared by various methods such as anodic oxidation, templating using wood, unidirectional solidification, extrusion, etc. The templating method directly replicates the porous microstructure of wood to prepare porous ceramics, whereas the extrusion method mimics the microstructures of tracheids and xylems in trees. These two methods are therefore the main focus of this review as they provide good examples of the preparation of functional porous ceramics with properties replicating nature. The well-oriented cylindrical through-hole pores prepared by the extrusion method using fibers as the pore formers provide excellent permeability together with high mechanical strength. Examples of applications of these porous ceramics are given, including their excellent capillary lift of over 1 m height which could be used to counteract urban heat island phenomena, and other interesting properties arising from anisotropic unidirectional porous structures.

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Macroporous Ceramics by Gelation–Freezing Route Using Gelatin

2014

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This paper reviews an advanced methodology for macroporous ceramic components, that can create nearly honeycomb shaped pore channels, unlike either ellipsoidal or dendritic or lamellar structures obtained via conventional freeze casting. Three main technological features have been discussed in terms of (i) honeycomb shaped morphologies, (ii) relationship between carefully selected freezing conditions, and cell properties generated, (iii) the engineering applications. This simple, ecofriendly, and versatile approach tailors porous architecture with engineered porosity and yields macro-cellular component with distinctive characteristics suitable for a variety of industrial applications.

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Control of pore channel size during freeze casting of porous YSZ ceramics with unidirectionally aligned channels using different freezing temperatures

Cited by 143 publications

References 23 publications

Hierarchy concepts: classification and preparation strategies for zeolite containing materials with hierarchical porosity

Hierarchy concepts: classification and preparation strategies for zeolite containing materials with hierarchical porosity

Porous ceramics mimicking nature—preparation and properties of microstructures with unidirectionally oriented pores

Macroporous Ceramics by Gelation–Freezing Route Using Gelatin

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