Mechanical performance and CO2 uptake of ion-exchanged zeolite A structured by freeze-casting

Ojuva, Arto; Järveläinen, Matti; Bauer, Marcus; Keskinen, Lassi; Valkonen, Masi; Akhtar, Farid; Levänen, Erkki; Bergström, Lennart

doi:10.1016/j.jeurceramsoc.2015.03.001

Cited by 52 publications

(36 citation statements)

References 44 publications

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“…In this case, the set of samples with the smallest pore size ( S3 in Table 2) exhibited the highest mean strength. The effect of increasing strength with decreasing pore size has been extensively reported in other ice-templated materials [31,37,38] and in other types of cellular structures [35,39–43]. Brezny and Green [44] proposed that one of the main contributions is caused by the reduction of the volume of the struts, thus affecting the probability of finding a catastrophic defect.…”

Section: Discussionmentioning

confidence: 99%

“…The strength of these materials has been extensively studied [27–30]; however, there is a lack of studies measuring their reliability. The only work that evaluates reliability of ice-templated structures was performed by Ojuva et al [31] in zeolites. They measured the effect of solids loading and cooling rate on Weibull modulus and estimated the probability of survival.…”

Section: Introductionmentioning

confidence: 99%

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The effect of wall thickness distribution on mechanical reliability and strength in unidirectional porous ceramics

Seuba

Deville

Guizard

et al. 2016

Science and Technology of Advanced Materials

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Macroporous ceramics exhibit an intrinsic strength variability caused by the random distribution of defects in their structure. However, the precise role of microstructural features, other than pore volume, on reliability is still unknown. Here, we analyze the applicability of the Weibull analysis to unidirectional macroporous yttria-stabilized-zirconia (YSZ) prepared by ice-templating. First, we performed crush tests on samples with controlled microstructural features with the loading direction parallel to the porosity. The compressive strength data were fitted using two different fitting techniques, ordinary least squares and Bayesian Markov Chain Monte Carlo, to evaluate whether Weibull statistics are an adequate descriptor of the strength distribution. The statistical descriptors indicated that the strength data are well described by the Weibull statistical approach, for both fitting methods used. Furthermore, we assess the effect of different microstructural features (volume, size, densification of the walls, and morphology) on Weibull modulus and strength. We found that the key microstructural parameter controlling reliability is wall thickness. In contrast, pore volume is the main parameter controlling the strength. The highest Weibull modulus () and mean strength (198.2 MPa) were obtained for the samples with the smallest and narrowest wall thickness distribution (3.1 m) and lower pore volume (54.5%).

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The effect of wall thickness distribution on mechanical reliability and strength in unidirectional porous ceramics

Seuba

Deville

Guizard

et al. 2016

Science and Technology of Advanced Materials

View full text Add to dashboard Cite

show abstract

“…The following points probably deserve more attention in future work. The Weibull modulus (which requires a very large number of samples), has just been reported in one study [170], and yet is critical to predict the reliability of these materials, in particular for structural applications.The detailed identification of the transition between the brittle and cellular failure modes could be determined more precisely. This understanding will be helpful to select the proper mechanical response based on the functional requirements of the targeted application.…”

Section: Discussionmentioning

confidence: 99%

A meta-analysis of the mechanical properties of ice-templated ceramics and metals

Deville

Meille

Seuba

2015

Science and Technology of Advanced Materials

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Ice templating, also known as freeze casting, is a popular shaping route for macroporous materials. Over the past 15 years, it has been widely applied to various classes of materials, and in particular ceramics. Many formulation and process parameters, often interdependent, affect the outcome. It is thus difficult to understand the various relationships between these parameters from isolated studies where only a few of these parameters have been investigated. We report here the results of a meta analysis of the structural and mechanical properties of ice templated materials from an exhaustive collection of records. We use these results to identify which parameters are the most critical to control the structure and properties, and to derive guidelines for optimizing the mechanical response of ice templated materials. We hope these results will be a helpful guide to anyone interested in such materials.

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“…In addition, for a controlled freezing, the mould -and in particular the cooling part of it -has to be designed in accordance with the desired temperature profile. Therefore, such monolithic materials mostly are freeze casted in the shape of cylinders 166,175 and tubes. 168 Once frozen, the ice-template has to be removed by sublimation which usually is performed via freeze drying in vacuum.…”

Section: Zeolitic Monoliths Via Freeze Castingmentioning

confidence: 99%

“…For the preparation of cylindrical zeolite A (LTA) 175 and zeolite 13X (FAU) monoliths, 166 Ojuva et al used bentonite and polyethylene glycol (PEG) as inorganic binder and intermittent binder, respectively (see also Fig. 18b).…”

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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Mechanical performance and CO2 uptake of ion-exchanged zeolite A structured by freeze-casting

Cited by 52 publications

References 44 publications

The effect of wall thickness distribution on mechanical reliability and strength in unidirectional porous ceramics

The effect of wall thickness distribution on mechanical reliability and strength in unidirectional porous ceramics

A meta-analysis of the mechanical properties of ice-templated ceramics and metals

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

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