Issues in Particle Size Analysis

Hogg, R.

doi:10.14356/kona.2008009

Cited by 23 publications

(10 citation statements)

References 8 publications

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“…Fractal dimension is not necessarily an integer, and ranges between the values of Euclidean geometry for a point and volume and varies from 0 to 3 [48]. Thus, the fine region of particles cannot be represented by a fractal dimension and this may be due to limitations of the laser diffraction (LD) technique used, as already mentioned in previous studies [66,67]. The validity of particle size measurements in the submicron range using light scattering systems is questionable, and thus the slope of the fine region of particle size distributions may be misleading.…”

Section: Rosin-rammler Gates-gaudin-schuhmann and Logistic Distributmentioning

confidence: 99%

Grinding Kinetics of Slag and Effect of Final Particle Size on the Compressive Strength of Alkali Activated Materials

et al. 2019

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This study aims to model grinding of a Polish ferronickel slag and evaluate the particle size distributions (PSDs) of the products obtained after different grinding times. Then, selected products were alkali activated in order to investigate the effect of particle size on the compressive strength of the produced alkali activated materials (AAMs). Other parameters affecting alkali activation, i.e., temperature, curing, and ageing time were also examined. Among the different mathematical models used to simulate the particle size distribution, Rosin-Rammler (RR) was found to be the most suitable. When piecewise regression analysis was applied to experimental data it was found that the particle size distribution of the slag products exhibits multifractal character. In addition, grinding of slag exhibits non-first-order behavior and the reduction rate of each size is time dependent. The grinding rate and consequently the grinding efficiency increases when the particle size increases, but drops sharply near zero after prolonged grinding periods. Regarding alkali activation, it is deduced that among the parameters studied, particle size (and the respective specific surface area) of the raw slag product and curing temperature have the most noticeable impact on the compressive strength of the produced AAMs.

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Section: Rosin-rammler Gates-gaudin-schuhmann and Logistic Distributmentioning

confidence: 99%

Grinding Kinetics of Slag and Effect of Final Particle Size on the Compressive Strength of Alkali Activated Materials

et al. 2019

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“…Where d 32 is defined by diameter of a sphere with the same specific surface area as the particle (Akhtar and Dickinson 2003; Hogg 2008). In the second formula, n i and d i are respectively the number and diameter of particles.…”

mentioning

confidence: 99%

Effects of Low and High Acyl Gellan Gums on Engineering Properties of Carrot Juice

Sherafati¹,

Kalbasi‐Ashtari²,

Mousavi³

2012

J Food Process Engineering

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The clear juice of peeled and blanched carrot (Nantes variety) was obtained and pasteurized and its °Brix and pH were adjusted. Then different ratios (0.02, 0.025 and 0.03%) of low and high acyl (LA and HA) gellan mixed separately with carrot juice and heated up to 70C for 20 min. Later, the rheological parameters, particle size distributions, turbidities and phase decantation of each sample was evaluated after 15 days storage at 4C. The samples of LA gellan had lower turbidity, viscosity, flow indexes (n < 1) and higher consistency coefficient, surface tension, specific surface area and sediment than control. However, the rheological and sensorial characteristics of the samples with HA gellan were very similar to control. While, the LA gellan gum was not able to stabilize the carrot juice, the HA gellan with 0.03% had a great influence on stabilization of colloidal system and had the most acceptable physical and sensory characteristics in comparison with the natural pasteurized carrot juice. PRACTICAL APPLICATIONS The pulp of carrot juice is a rich source of phytochemicals (beta carotene, antioxidants, tannins and fibers), and it is important to keep it in suspension during juice processing, storage and handling for healthy drinking. During the last few years, the production of gelatin from cattle bone (as a stabilizer of fruit juices) has faced with different religious restrictions such as Kosher and Halal. Also the emergence of bovine spongiform encephalo‐pathy virus in cattle‐raising has caused a sharp reduction in the production of this stabilizer. Recently, the high acyl and low acyl gellan gums (produced by fermentation) are used as two hydrocolloids with interesting properties in various kinds of food products. This study suggested that incorporating high acyl gellan (instead of gelatin) with fresh carrot juice provides a pleasant drink with high pulp stability, good palatability (such as flavor, appearance and consistency) and long shelf life without noticeable sediment.

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“…It is clear that the size distribution by light scattering is significantly broader than the expected distribution within the sieve interval as indicated by the solid line in the figure (based on an assumed uniform distribution in that range). The broadening of the apparent distribution can probably be attributed to the somewhat limited resolution of the scattering procedure (Hogg, 2008).…”

Section: Discussionmentioning

confidence: 99%

A Spheroid Model for the Role of Shape in Particle Size Analysis

Hogg

2015

KONA

Self Cite

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Standard procedure in particle size analysis is to express size as an equivalent sphere diameter. As a consequence, results obtained by procedures based on different kinds of response give different results. An alternative approach is presented based on a spheroidal shape which, depending on elongation can represent shapes ranging from rods, through spheres to discs. Particle size and shape are then presented as volume diameter and elongation. Applications to commonly used procedures are presented. For particles of similar shape, i.e., elongation independent of size, the results of procedures such as sieving, microscopy and sedimentation show a simple shift in apparent size with the form of the distribution unaffected. In the case of methods based on radiation scattering, orientation effects lead to an apparent size distribution even for identical particles. Experimental results on glass spheres, crushed quartz particles and fine kaolin are shown to be consistent with the spheroid model. Analysis of the quartz data by a variety of techniques gave consistent values for the volume diameter and elongation. Light scattering measurements on a series of narrow sieve fractions of the quartz particles showed no variation in elongation with size.

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Issues in Particle Size Analysis

Abstract: Important issues that arise in the acquisition

Cited by 23 publications

References 8 publications

Grinding Kinetics of Slag and Effect of Final Particle Size on the Compressive Strength of Alkali Activated Materials

Grinding Kinetics of Slag and Effect of Final Particle Size on the Compressive Strength of Alkali Activated Materials

Effects of Low and High Acyl Gellan Gums on Engineering Properties of Carrot Juice

A Spheroid Model for the Role of Shape in Particle Size Analysis

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