Topic
Volume fraction
About: Volume fraction is a research topic. Over the lifetime, 16312 publications have been published within this topic receiving 374181 citations.
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TL;DR: In this paper, a numerical model of isothermal and non-isothermal first order phase transformations, such as the crystallization of liquids and glasses, is presented, taking into account time-dependent nucleation rates and cluster-size-dependent growth velocities.
Abstract: A new numerical model of isothermal and non-isothermal first order phase transformations, such as the crystallization of liquids and glasses, is presented. This model computes directly the volume fraction transformed, taking into account time-dependent nucleation rates and cluster-size-dependent growth velocities. The model is applied to the crystallization of lithium disilicate glass, using the appropriate kinetic and thermodynamic parameters. The model is used (1) to determine the validity of common methods for computing the volume fraction transformed as a function of time in isothermal experiments when a time-dependent nucleation rate is expected, (2) to simulate non-isothermal differential scanning calorimetry (DSC) studies of glass devitrification as a function of scan rate, and (3) to compute the effect of preannealing on the DSC peak parameters. A novel behavior of the nucleation rate with scan rate is predicted, arising because the relaxation of the cluster distribution cannot be described by a single relaxation time. Comparisons of the calculations with experimental data on this glass demonstrate the validity of the model.
108 citations
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TL;DR: The relationship between the polymer concentration and the volume fraction is quantified, and it is shown that the glass transition behaviour of soft microgels can be mapped to that of hard sphere glasses once theVolume fraction is used as the control parameter.
Abstract: We explore the influence of particle softness on the state diagram of well characterized polyelectrolyte microgel suspensions using dynamic light scattering and rheology. Upon increasing the polymer concentration, we cross successively the well defined glass and jamming transitions which delimit four different states: dilute colloidal suspension, entropic glass, jammed glass, and dense glass. Each state has a specific dynamical fingerprint dictated by two key ingredients related to particle softness: elastic contact interactions, and osmotic or steric deswelling. Soft interactions control yielding and flow of the jammed glasses. The shrinkage of the microgels makes the glass transition look smoother than in hard sphere suspensions. We quantify the relationship between the polymer concentration and the volume fraction, and show that the glass transition behaviour of soft microgels can be mapped to that of hard sphere glasses once the volume fraction is used as the control parameter.
108 citations
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TL;DR: In this paper, the experimental results of the experimental thermal conductivity, viscosity and density of homogeneous and stable nanofluids consisting of both synthesized and commercial ZnO nanoparticles dispersed in ethylene glycol (EG) are presented.
108 citations
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TL;DR: In this paper, the effects of coherent and incoherent interfaces in large-scale simulations were analyzed for a bi-material and a tri-material system composed of both coherent and non-coherent interfaces.
107 citations
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TL;DR: In this article, the influence of the composition and the microstructure of laser cladded metal matrix composite (MMC) coatings on their mechanical properties (namely hardness and adhesive wear resistance) was investigated.
107 citations