Results 211 to 220 of about 229,787 (259)

Particle and pore size distributions of investments

Journal of Oral Rehabilitation, 1986
SummaryThe particle‐size distributions of investment powders and the pore‐size distributions of set‐fired investments were investigated by electrozone size analysis, and by mercury intrusion scanning porosimetry, respectively, for a number of different investments, representing all three types available, namely: the gypsum‐, phosphate‐ and silicate ...
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From pore size distribution to an equivalent pore size of cement mortar

Materials and Structures, 1990
An experimental and theoretical study has been performed with the aim of quantifying pore size distribution curves and correlating them with water and oxygen permeability. Twenty mortars have been investigated which contained Portland cement, blast-furnace slag cement and silica fume as a binder. Admixtures have been used as well.
H. W. Reinhardt, K. Gaber
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Pore size distribution and capacitance in microporous carbons

Physical Chemistry Chemical Physics, 2012
Modelling shows that the pore size distribution of microporous carbons determined by NLDFT only hides relatively small variations of the surface-related capacitance C/S between 0.7 and 1.3 nm. This suggests again that C/S in TEABF(4)-AN is 0.09 ± 0.01 F m(-2) for our typical carbons, including carbide-based samples.
Stoeckli F, Centeno TA
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Modeling the dynamics of the soil pore-size distribution

Soil and Tillage Research, 2002
Soil tillage often results in a structurally unstable soil layer with an elevated inter-aggregate porosity that is gradually decreased by the interplay of capillary and rheological processes. We have previously proposed to describe the evolution of the pore-size distribution (PSD) with the Fokker–Planck equation (FPE). The coefficients of this equation
Leij, F. J., Ghezzehei, T. A., Or, D.
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Pore Size Distributions in Clays

Clays and Clay Minerals, 1970
AbstractA knowledge of the distribution of pore sizes in clay and soil bodies is a useful element in the microstructural characterization of such materials. Pore-size distributions and total porosity of a number of reference clays, naturally-occurring subsoils, and commercial clay samples prepared in various ways were determined by mercury porosimetry.
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Analysis of pore size distribution by 2H NMR

The Analyst, 2007
The pore size distributions of four controlled pore glasses with mean diameters ranging from ca. 7.9 to 23.9 nm were analysed by measuring the (2)H NMR signals from the liquid fraction of confined benzene-d(6) and cyclohexane-d(12) as a function of temperature, in steps of ca. 0.1-1 K.
Liudvikas, Kimtys, Dagfinn W, Aksnes
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Pore-Size Distribution in Sandstones

AAPG Bulletin, 1993
ABSTRACT Pore size in reservoir rocks is measured either directly in thin sections under a petrographic microscope or, nominally, by injecting mercury under pressure into the rock sample. The frequency distribution for nominal pore-size data shows a log-normal pattern similar to that for grain size in sedimentary rocks. Therefore, the
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Pore size and pore size distribution on the surface of polyethersulfone hollow fiber membranes

Desalination, 1991
Abstract Hollow fiber membranes were prepared by the solution spinning technique from polyethersulfone polymer. Investigations were made on the effect of the nature of internal coagulants on the ultrafiltration performance. It was found that both solute PEG separation and permeation rate decrease with an increase in the carbon number of the ...
Tinghui Liu, Shuguang Xu, Donghua Zhang, S Sourirajan, Takeshi Matsuura   +4 more
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A Modified Pore Filling Isotherm with Application in Determination of Pore Size Distributions

Langmuir, 1994
A modification of the Dubinin theory of volume filling is proposed here by combining it with a Langmuirian model at low pressures. The hybrid model satisfies the requirement of a Henry's law asymptote as well as predicts a limiting micropore size for this kind of filling.
BHATIA, SK, SHETHNA, HK
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Porosity and Pore Size Distribution

1994
Two other particle physics parameters of interest are porosity and pore size distribution. They are listed separately and distinctly because they are separate and distinct. Certainly they are related, but they each give different information and they apply to different processing phenomena.
James E. Funk, Dennis R. Dinger
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