Journal ArticleDOI
Morphology of aggregates
Avrom I. Medalia
- Vol. 24, Iss: 3, pp 393-404
TLDR
In this article, the silhouette of an aggregate is treated as a plane figure, for which are calculated the radii of gyration about the two central principal axes in the plane, and other parameters are also calculated including the area and bulkiness, as well as a "structure factor" which expresses the excess area swept out by the figure as it rotates.Abstract:
This paper gives a new geometrical method for analyzing the shape of colloidal aggregates from electron micrographs. The silhouette of an aggregate is treated as a plane figure, for which are calculated the radii of gyration about the two central principal axes in the plane. The ratio of these radii is taken as the anisometry of the figure, and other parameters are also calculated including the area and bulkiness, as well as a “structure factor” which expresses the excess area swept out by the figure as it rotates. These parameters characterize the two-dimensional projection of the aggregate; in order to relate this to the three-dimensional aggregate, we have generated floes by computer simulation (based on the method of M. Vold) and determined their two-dimensional parameters. Qualitative similarity is shown between the appearance of the simulated floes and of actual electron micrographs of carbon black.read more
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TL;DR: In this paper, the authors discuss the factors that determine the ultimate particle size in pyrogenic silica synthesis and show that the size of the final particle is determined solely by the frequency of Brownian collisions.
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a Recipe for Image Characterization of Fractal-Like Aggregates
TL;DR: In this paper, a simple and straightforward recipe for characterizing the structural and fractal properties of aggregates from projected images is presented, starting from geometrical properties that are directly measured from the projected image, such as primary particle mean diameter, maximum projected length, projected area, and overlap coefficient.
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Absorption and scattering of light by polydisperse aggregates
TL;DR: The absorption, scattering, and differential scattering cross sections are presented for polydisperse aggregates of prescribed fractal dimension and uniform primary particle size and possess a size scale that is pertinent to laboratory experiments and industrial processes.
References
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Isothermals, isopiestics and isometrics relative to viscosity
TL;DR: In this paper, a preliminary account of the isothermals, the isopiestics, and the isometrics with respect to viscosity is given, and it is shown that the marine glue can be changed permanently by cautiously heating it for different lengths of time.
Journal ArticleDOI
Grading Aggregates - I. - Mathematical Relations for Beds of Broken Solids of Maximum Density
Book
Paint flow and pigment dispersion
TL;DR: Paint flow and pigment dispersion as mentioned in this paper, a.k.a. paint flow and pigmentation dispersion, is a technique for painting with pigment dispensation. But it is not suitable for outdoor painting.