Quantification of Microstructures in Stable and Gelated Suspensions from Cryo-SEM

Wyss, Hans M.; Hütter, Markus; Müller, Martin; Meier, Lorenz; Gauckler, Ludwig J.

doi:10.1006/jcis.2001.8220

Cited by 27 publications

(31 citation statements)

References 26 publications

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“…These simulations were used to study the coagulation dynamics and the evolving microstructures in dense colloidal suspensions and the resulting microstructures agree well with experiments [16].…”

Section: Introductionsupporting

confidence: 58%

“…Additionally, a new method called the straight path method, characterizing the quasi-linear arrangement of particle chains, is introduced. The evaluation of these characterization methods is performed with regard to their ability to distinguish quantitatively between homogeneous and heterogeneous microstructures obtained from BDsimulations [15] mimicking well those found in experiments [16]. …”

Section: Introductionmentioning

confidence: 99%

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Microstructures and mechanical properties of dense particle gels: Microstructural characterisation

Schenker

Filser

Aste

et al. 2008

Journal of the European Ceramic Society

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The macroscopic mechanical properties of densely packed coagulated colloidal particle gels strongly depend on the local arrangement of the powder particles on length scales of a few particle diameters. Heterogeneous microstructures exhibit up to one order of magnitude higher elastic properties and yield strengths than their homogeneous counterparts. The microstructures of these gels are analyzed by the straight path method quantifying quasi-linear particle arrangements of particles. They show similar characteristics than force chains bearing the mechanical load in granular material. Applying this concept to gels revealed that heterogeneous colloidal microstructures show a significantly higher straight paths density and exhibit longer straight paths than their homogeneous counterparts.

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Section: Introductionsupporting

confidence: 58%

Section: Introductionmentioning

confidence: 99%

Microstructures and mechanical properties of dense particle gels: Microstructural characterisation

Schenker

Filser

Aste

et al. 2008

Journal of the European Ceramic Society

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“…In an earlier paper we described in detail the quantitative analysis of stereo images of high-pressure frozen suspensions and gels [15]. Radial pair correlation functions g(r) are obtained based on the assumption that we are able to identify all particle positions in a layer of thickness z within our sample.…”

Section: Quantitative Analysis Of Sem-imagesmentioning

confidence: 99%

“…In an earlier article [15], we showed that the microstructure of stable and gelated silica suspensions can be quantified by using high-pressure freezing in combination with cryo-SEM. By using high-pressure freezing, the formation of ice-crystals in our concentrated suspensions and gels is adequately suppressed.…”

Section: Introductionmentioning

confidence: 99%

Relation between microstructure and mechanical behavior of concentrated silica gels

Wyss

Tervoort

Meier

et al. 2004

Journal of Colloid and Interface Science

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“…However, cryo-SEM is naturally limited by resolution ( Fig. 7.20a; Wyss et al, 2002) and thus not very suited for phases at the nanoscale.…”

Section: Imaging Techniquesmentioning

confidence: 99%

Nucleation, Growth, and Aggregation of Mineral Phases: Mechanisms and Kinetic Controls

Benning

Waychunas

2008

Kinetics of Water-Rock Interaction

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The formation of any phase, whether natural or synthetic (Fig. 7.1), is usually a disequilibrium process that follows a series of steps until a thermodynamically stable state (equilibrium) is achieved. The first step in the process of creating a new solid phase from a supersaturated solution (either aqueous or solid) is called nucleation. A particle formed by the event of nucleation usually has a poorly ordered and often highly hydrated structure. This particle is metastable with respect to ordering into a well-defined phase, which can accompany growth of the particle. This process of initiation of a new phase is defined as a first order transition and can follow various pathways involving a host of mechanisms. One of these pathways occurs when individual nuclei coalesce into larger clusters, a process defined as aggregation, which itself can follow a series of different pathways. The new phase is thermodynamically defined when the growing nucleus or aggregate has distinct properties relative to its host matrix; for example, a well-defined crystal structure, composition and/or density. These processes depend on a plethora of chemical and physical parameters that control and strongly affect the formation of new nuclei, the growth of a new crystal, or the aggregation behavior of clusters, and it is these issues that will be the focus of this chapter. We will discuss the mechanisms and rates of each process as well as the methods of quantification or modeling from the point of view of existing theoretical understanding. Each step will be illustrated with natural examples or laboratory experimental quantifications. Complementary to the information in this chapter, a detailed analysis of the mechanisms and processes that govern dissolution of a phase are discussed in detail in Chap. 5 and more detailed information about molecular modeling approaches are outlined in Chap. 2.

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Quantification of Microstructures in Stable and Gelated Suspensions from Cryo-SEM

Cited by 27 publications

References 26 publications

Microstructures and mechanical properties of dense particle gels: Microstructural characterisation

Microstructures and mechanical properties of dense particle gels: Microstructural characterisation

Relation between microstructure and mechanical behavior of concentrated silica gels

Nucleation, Growth, and Aggregation of Mineral Phases: Mechanisms and Kinetic Controls

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