Relation between microstructure and mechanical behavior of concentrated silica gels

H.M. Wyss; E. Tervoort; L.P. Meier; Martin Müller; L.J. Gauckler

doi:10.1016/j.jcis.2004.01.065

Relation between microstructure and mechanical behavior of concentrated silica gels

H.M. Wyss, E. Tervoort, L.P. Meier, Martin Müller, L.J. Gauckler

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Abstract

We produce concentrated (40 vol%) gels of uniformly sized silica particles by an in situ process, based on the enzyme-catalyzed hydrolysisof urea in the liquid phase of electrostatically stabilized suspensions. Two different methods are used: Either the pH of the suspensions isshifted toward the isoelectric point of the particles (??pH method), or the ionic strength is continuously increased at constant pH (??I method).We compare the two kinds of gels in terms of elastic and yield behavior as well as microstructure by using rheological measurements inoscillation and high-pressure freezing in combination with cryo-SEM, respectively. Results suggest a strong increase of elastic and yieldproperties in concentrated particle gels with decreasing homogeneity of their microstructures.

Original language	English
Pages (from-to)	455-462
Journal	Journal of Colloid and Interface Science
Volume	273
Issue number	2
DOIs	https://doi.org/10.1016/j.jcis.2004.01.065
Publication status	Published - 2004
Externally published	Yes

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title = "Relation between microstructure and mechanical behavior of concentrated silica gels",

abstract = "We produce concentrated (40 vol%) gels of uniformly sized silica particles by an in situ process, based on the enzyme-catalyzed hydrolysisof urea in the liquid phase of electrostatically stabilized suspensions. Two different methods are used: Either the pH of the suspensions isshifted toward the isoelectric point of the particles (??pH method), or the ionic strength is continuously increased at constant pH (??I method).We compare the two kinds of gels in terms of elastic and yield behavior as well as microstructure by using rheological measurements inoscillation and high-pressure freezing in combination with cryo-SEM, respectively. Results suggest a strong increase of elastic and yieldproperties in concentrated particle gels with decreasing homogeneity of their microstructures.",

author = "H.M. Wyss and E. Tervoort and L.P. Meier and Martin M{\"u}ller and L.J. Gauckler",

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T1 - Relation between microstructure and mechanical behavior of concentrated silica gels

AU - Wyss, H.M.

AU - Tervoort, E.

AU - Meier, L.P.

AU - Müller, Martin

AU - Gauckler, L.J.

PY - 2004

Y1 - 2004

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AB - We produce concentrated (40 vol%) gels of uniformly sized silica particles by an in situ process, based on the enzyme-catalyzed hydrolysisof urea in the liquid phase of electrostatically stabilized suspensions. Two different methods are used: Either the pH of the suspensions isshifted toward the isoelectric point of the particles (??pH method), or the ionic strength is continuously increased at constant pH (??I method).We compare the two kinds of gels in terms of elastic and yield behavior as well as microstructure by using rheological measurements inoscillation and high-pressure freezing in combination with cryo-SEM, respectively. Results suggest a strong increase of elastic and yieldproperties in concentrated particle gels with decreasing homogeneity of their microstructures.

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DO - 10.1016/j.jcis.2004.01.065

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SP - 455

EP - 462

JO - Journal of Colloid and Interface Science

JF - Journal of Colloid and Interface Science

IS - 2

ER -

Relation between microstructure and mechanical behavior of concentrated silica gels

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