Control of Lamellae Spacing During Freeze Casting of Ceramics Using Double‐Side Cooling as a Novel Processing Route

Waschkies, Thomas; Oberacker, R.; Hoffmann, Michael J.

doi:10.1111/j.1551-2916.2008.02673.x

Cited by 133 publications

(130 citation statements)

References 18 publications

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“…interconnectivity and size) in the final material depend on its initial position within the mould. 173,174 Thus, not only the direction of the resulting pores but also their characteristics can be tailored by the design of the cooling part (or parts). 173 Though, the freedom of design is to some extent limited by the necessity of using a mould (to carry the liquid) with the accompanying requirement of removing the mould after freezing.…”

Section: Zeolitic Monoliths Via Freeze Castingmentioning

confidence: 99%

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%

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

et al. 2016

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“…Deville et al 2006a;Fu et al 2008a;Pekor et al 2008). The advantage of two-sided freeze-casting systems, in which the bottom and top of the mould are closed by copper plates whose temperature can be varied independently, is that the temperature gradient and freezing-front velocity within the sample can be better controlled (Deville et al 2006a,c;Waschkies et al 2009). In both systems, Figure 2.…”

Section: The Freezing Processmentioning

confidence: 99%

“…In most freeze-casting systems, the applied cooling rate is measured at the cold-finger-sample interface, but not the velocity of the freezing front during processing itself. However, in systems that are equipped with a thermocouple array embedded in the mould, the freezing-front velocity can be measured directly and the cold-finger cooling rate adjusted to achieve a desired value (Waschkies et al 2009). Once the temperature of the cold finger is lower than the solidification temperature of the slurry, a freezing front, defined as the interface between the solid and the liquid phases, is formed and starts to travel through the sample.…”

Section: The Freezing Processmentioning

confidence: 99%

Biomaterials by freeze casting

Wegst

Schecter

Donius

et al. 2010

Phil. Trans. R. Soc. A.

306

254

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The functional requirements for synthetic tissue substitutes appear deceptively simple: they should provide a porous matrix with interconnecting porosity and surface properties that promote rapid tissue ingrowth; at the same time, they should possess sufficient stiffness, strength and toughness to prevent crushing under physiological loads until full integration and healing are reached. Despite extensive efforts and first encouraging results, current biomaterials for tissue regeneration tend to suffer common limitations: insufficient tissue-material interaction and an inherent lack of strength and toughness associated with porosity. The challenge persists to synthesize materials that mimic both structure and mechanical performance of the natural tissue and permit strong tissue-implant interfaces to be formed. In the case of bone substitute materials, for example, the goal is to engineer high-performance composites with effective properties that, similar to natural mineralized tissue, exceed by orders of magnitude the properties of its constituents. It is still difficult with current technology to emulate in synthetic biomaterials multi-level hierarchical composite structures that are thought to be the origin of the observed mechanical property amplification in biological materials. Freeze casting permits to manufacture such complex, hybrid materials through excellent control of structural and mechanical properties. As a processing technique for the manufacture of biomaterials, freeze casting therefore has great promise.

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“…Munch et al 71 showed that patterning the freezing surface can manipulate the long-range ordering of ice lamellae by controlling the initial direction of nucleation. Deville et al 67 and Waschkies et al 83 used double-sided cooling to more precisely control the temperature gradient. Moon et al, 84 Macchetta et al, 49 and Koh et al 85 demonstrated the concept of radial cooling to construct porous ceramics with radial channel alignment (Fig.…”

Section: Microstructural Controlmentioning

confidence: 99%

Biomimetic Materials by Freeze Casting

Porter

McKittrick

Meyers

2013

JOM

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Natural materials, such as bone and abalone nacre, exhibit exceptional mechanical properties, a product of their intricate microstructural organization. Freeze casting is a relatively simple, inexpensive, and adaptable materials processing method to form porous ceramic scaffolds with controllable microstructural features. After infiltration of a second polymeric phase, hybrid ceramic-polymer composites can be fabricated that closely resemble the architecture and mechanical performance of natural bone and nacre. Inspired by the narwhal tusk, magnetic fields applied during freeze casting can be used to further control architectural alignment, resulting in freeze-cast materials with enhanced mechanical properties.

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Control of Lamellae Spacing During Freeze Casting of Ceramics Using Double‐Side Cooling as a Novel Processing Route

Cited by 133 publications

References 18 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

Biomaterials by freeze casting

Biomimetic Materials by Freeze Casting

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