The collapsing properties of kaolinite aerogels of dilute suspensions and analysis based on structure models

Ishikawa, Nao; Fujii, Katsumi; Satta, Naoya

doi:10.1016/j.clay.2007.05.010

Cited by 2 publications

(3 citation statements)

References 5 publications

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“…Anisotropic polymeric foams have shown to give much higher exponent value that reach up to 6, which is comparable to value obtained for clay aerogels (5.7) when bulk (mass) density is used in the power law relationship. The layered structures of these clay and polymer/clay aerogels lead to exponent values that are much higher than the values found in other clay aerogels (3.74 and 5.7 in this study and 3 for kaolinite aerogels) …”

Section: Resultscontrasting

confidence: 76%

“…The layered structures of these clay and polymer/clay aerogels lead to exponent values that are much higher than the values found in other clay aerogels (3.74 and 5.7 in this study and 3 for kaolinite aerogels). 32 Exponent values for yield strength are lower than elastic modulus in plastically yielding cellular solids. 1,33 This is also true for clay and polymer/clay aerogels, which reconfirms the dominance of plastic foam behavior.…”

Section: Resultsmentioning

confidence: 99%

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Influence of Electrolyte and Polymer Loadings on Mechanical Properties of Clay Aerogels

Alhassan¹,

Qutubuddin²,

Schiraldi³

2010

Langmuir

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The effects of electrolyte and polymer loadings on formation, density, and mechanical properties of clay aerogels have been investigated. Coherent aerogels were formed at all tested concentrations except at a combination of low electrolyte (<0.04 M) and polymer (<1% w/v) concentrations because of partial clay flocculation. The compressive modulus and yield strength of the aerogels containing poly(vinyl alcohol) are sensitive to electrolyte loading at low polymer concentration but are otherwise insensitive. Mechanical properties show power law dependence on aerogel density, which depends mainly on polymer loading. The power law exponent for the compressive modulus is 3.74 when the relative density is used in the model and 5.7 when the measured bulk density is used instead. These high exponent values are attributed to the layered microstructure of these aerogels.

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Section: Resultscontrasting

confidence: 76%

Section: Resultsmentioning

confidence: 99%

Influence of Electrolyte and Polymer Loadings on Mechanical Properties of Clay Aerogels

Alhassan¹,

Qutubuddin²,

Schiraldi³

2010

Langmuir

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“…While the process of freeze drying is generally accepted to leave the frozen gel unaltered, it has been recently shown that the rate at which a kaolinite clay gel is frozen can alter its structure [7] [8]. Freezing in liquid nitrogen (-196⁰C) produced an open-cell foam structure that is believed to reflect the structure of the gel before freezing.…”

Section: Structure Of Clay Aerogelsmentioning

confidence: 99%

Alkali Activated Aerogels

Svingala

2009

Mechanical Properties and Performance of Engineering Ceramics and Composites IV

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Clay aerogels are unique materials formed through the sublimation drying of aluminosilicate clay hydrogels. Aerogels have been an area of increased research interest in the past decade due to their very low density, high surface area/porosity, and very low thermal conductivity. Significant efforts have been made to increase the mechanical strength and moisture resistance of these materials through the incorporation of both organic polymers and fiber reinforcement. Aluminosilicates can also be alkali activated, producing a highlycrosslinked 3D network polymer with generally excellent mechanical strength and chemical resistance, but with high density. This work presents a preliminary investigation into the combination of aerogel production techniques with alkali activation, with the goal of producing a high strength, alkali activated aerogel. Metakaolin, dehydroxylated montmorillonite and S-Type furnace slag were investigated as aluminosilicate sources. It was found that it is possible to create a stable solid material with density of approximately 0.9 g•cm-1 , compressive strength up to 9.9 MPa, and porosity on the order of 10-30 microns.

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The collapsing properties of kaolinite aerogels of dilute suspensions and analysis based on structure models

Cited by 2 publications

References 5 publications

Influence of Electrolyte and Polymer Loadings on Mechanical Properties of Clay Aerogels

Influence of Electrolyte and Polymer Loadings on Mechanical Properties of Clay Aerogels

Alkali Activated Aerogels

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