Self-Organization of Large Alumina Platelets and Silica Nanoparticles by Heteroaggregation and Sedimentation: Toward an Alternative Shaping of Nacre-Like Ceramic Composites

Cerbelaud, Manuella; Muňoz, Mariana; Rossignol, Fabrice; Videcoq, Arnaud

doi:10.1021/acs.langmuir.0c00170

Cited by 11 publications

(12 citation statements)

References 24 publications

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“…It has been shown [16], that the heteroaggregation of silica nanoparticles and alumina platelets can help disaggregating the suspension. In this study, a third component is used, (Fig.…”

Section: Heteroaggregationmentioning

confidence: 99%

Nacre-like Alumina Composites Based on Heteroaggregation

Muñoz¹,

Cerbelaud²,

Videcoq³

et al. 2020

Preprint

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<div> <div> <div> <p>High strength and high toughness are usually mutually exclusive in materials. Among all material classes, ceramics exhibit a high stiffness and strength, but they present a limited plastic deformation, which results in a moderate toughness. However, tough ceramics have been obtained using anisotropic particles organized in a "brick and mortar" microstructure, inspired by the structure of the natural nacre. Here, we propose to build nacre-like ceramic composites from colloidal suspensions using heteroaggregation of particles. Two different shaping processes are used: direct settling of suspensions or freeze-granulation. After sintering, in both cases, the platelets alignment is very good, close to that of platelets in natural nacre, with a slightly better one noted for direct settling. Despite a better platelet alignment, the toughness is lower than in previous studies showing that further improvement of the interfacial phases present in the material must now be considered to reinforce its mechanical behavior. </p> </div> </div> </div>

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“…It has been shown [16], that the heteroaggregation of silica nanoparticles and alumina platelets can help disaggregating the suspension. In this study, a third component is used, (Fig.…”

Section: Heteroaggregationmentioning

confidence: 99%

Nacre-like Alumina Composites Based on Heteroaggregation

Muñoz¹,

Cerbelaud²,

Videcoq³

et al. 2020

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…Here, we show that such nacre-like ceramic composites can be obtained without addition of organic additives using simple shaping methods. Brownian dynamics simulations and experiments have indeed shown that using the heteroaggregation between the alumina platelets and the silica nanoparticles in aqueous suspensions yields at the same time a compact arrangement of the platelets and a good spatial distribution of the silica in between them [16].…”

Section: Introductionmentioning

confidence: 97%

“…An alternative, that avoids the introduction of organic compounds in the microstructure, is to take advantage of surface charges present at the surface of particles in aqueous suspensions. Previous studies have shown that the heteroaggregation of particles under the action of the electrostatic forces represents a promising method to control the arrangement of particles [14,15,16].…”

Section: Introductionmentioning

confidence: 99%

Nacre-like alumina composites based on heteroaggregation

Muňoz

Cerbelaud

Videcoq

et al. 2020

Journal of the European Ceramic Society

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High strength and high toughness are usually mutually exclusive in materials. Among all material classes, ceramics exhibit a high stiffness and strength, but they present a limited plastic deformation, which results in a moderate toughness. However, tough ceramics have been obtained using anisotropic particles organized in a 'brick and mortar' microstructure, inspired by the structure of the natural nacre. Here, we propose to build nacre-like ceramic composites from colloidal suspensions using heteroaggregation of particles. Two different shaping processes are used: direct settling of suspensions or freeze-granulation. After sintering, in both cases, the platelets alignment is very good, close to that of platelets in natural nacre, with a slightly better one noted for direct settling. Despite a better platelet alignment, the toughness is lower than in previous studies showing that further improvement of the interfacial phases present in the material must now be considered to reinforce its mechanical behavior.

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“…Another field of application is the stabilization of emulsions by heteroaggregates [20] [21], which could replace efficiently the use of traditional organic surfactants, which are not healthy nor environmental-friendly. Finally the use of binary components mixtures and heteroaggregation was employed for advanced ceramics [22], to obtain a well-designed porosity for example [23] [24], or for biomimetic materials [25]. In parallel, some studies have proposed some kinetic models to describe and predict the coagulation process [26] [27] [28] [29].…”

Section: Introductionmentioning

confidence: 99%

“…A very innovative granulation method in dilute suspension was proposed as a direct application, leading to well-designed dense and porous ceramic millimetric beads [38] [39] [40] [41]. Another recent application was a biomimetic assembly silica-alumina nacre-like composite [25]. In the literature, the addition of inorganic colloidal sols was reported for the stabilization of ceramic slurries.…”

Section: Introductionmentioning

confidence: 99%

An experimental and simulation study of heteroaggregation in a binary mixture of alumina and silica colloids

Aimable

Delomenie

Cerbelaud

et al. 2020

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Heteroaggregation corresponds to an attraction between two different types of particles. It can either lead to stable or instable systems, depending on the conditions. In this paper heteroaggregation in binary mixtures of alumina and silica colloids (size ratio = 8.5) is studied, by coupling an experimental approach and Brownian dynamics simulations. Two main objectives are targeted. The first one is to bridge the gap between coagulation and dispersion, by examining the effect of the relative concentrations of silica and alumina. The second one is to study the effect of the volume fraction of solid, which impacts strongly the aggregation mechanism. The coagulation or the dispersion are evidenced by sedimentation tests, granulometry, and rheological measurements, supported by zeta potential measurements. Heteroaggregates could be observed by transmission electron microscopy. Brownian dynamics simulations give more insight into the very first moments of the process, to predict the adsorption kinetic and the heteroaggregates structure. A very good agreement is obtained between experiments and simulations, which both show adsorption of silica leads to the bridging of alumina particles and thus coagulation at low concentration. This adsorption is rapidly limited by electrostatic interactions, then hindering alumina agglomeration by repulsive interactions. For the higher solid fractions, alumina aggregation is more likely, as two alumina particles can easier encounter before their surface is enough covered by the silica to avoid their aggregation.

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Self-Organization of Large Alumina Platelets and Silica Nanoparticles by Heteroaggregation and Sedimentation: Toward an Alternative Shaping of Nacre-Like Ceramic Composites

Cited by 11 publications

References 24 publications

Nacre-like Alumina Composites Based on Heteroaggregation

Nacre-like Alumina Composites Based on Heteroaggregation

Nacre-like alumina composites based on heteroaggregation

An experimental and simulation study of heteroaggregation in a binary mixture of alumina and silica colloids

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