Effect of Particle Porosity

When the effective diffusivity of solutes D g can be approximated by the diffusivity in water, D, multiplied by a constant that includes the effects of particle porosity and tortuosity of pores in particles. Equation 14.3 can be written as follows ... 

Sadeghi Z, Oinidkhah MR, Masoomi ME. The effect of particle porosity in mixed matrix membrane permeation models. Int Sch Sd Res Innovation 2015 9(1) 104-9. 

Most of these factors are self-explanatory and are covered extensively in Chap. 4. The effect of particle size, drug loading, porosity, molecular weight, of the polymer, and ionic interactions on the release of drugs from the biodegradable polymers are discussed in the following sections. 

FACTORS AFFECTING FLOW AND CONDUCTIVITY 3.1. Effect of Particle Size and Porosity... 

Figure 2. Schematic diagram showing the effects of particle size, shape, and degree of flocculation on the porosity of the cast produced in slip casting.

Iley, W.J. Effect of particle size and porosity on particle film coatings. Powder Technology 65(1-3) (1991) 441- 5. 

Thus, yields of extract tend to increase when the particle size of the treated coal is reduced the greatest effect is observed when coals are milled to the order of size of 1 pm (0.001 mm). In extraction of bituminous coals with primary aliphatic amines, the effect of particle size over the range 72-240 mesh was always small but increased somewhat with increasing rank, as would be expected from the decrease in porosity. The effect of time on the yield of the extract has also been investigated and, like the effect of efficient contact between the coal and the solvent, may vary with the conditions prevalent during the extraction. 

In many processing sequences a filter is preceded by a particle formation unit such as a crystalliser or precipitator, the product from which can have a profound effect on filter cycle performance. While the effects of particle size on washing and deliquoring are explicit in the equations, correlations and design charts relating to those processes, the effects on cake formation need to approximated for the purpose of simulation. Although ideally the variation of specific resistance and porosity with particle size would be assessed experimentally, for the current purpose approximations... 

The chaining together of spherical silica particles into a gel structure has been dis> cussed in detail in Chapter 3. Now the effects of particle size and particle packing on porosity will be considered. 

Prieto EM, et al. Effects of particle size and porosity on in vivo remodeling of settable allograft bone/polymer composites. J Biomed Mater Res B Appl Biomater 2015 103(8) 1641-51. 

The contact between the metal nanoparticles and Nafion micelles in the CL of a DMFC is affected by carbon-support-particle pore size and distribution [79]. Rao et al. investigated the effect of carbon porosity on the specific activity of the Pt-Ru/C catalyst for methanol oxidation [83]. They found that a higher content of small pores (< 20 nm) containing metal particles, where die Nafion ionomer could not easily enter, resulted in poor contact between die metal nanoparticles and... 

The effective diffusion coefficient can be estimated with Equations A4.3 through A4.9. The highest uncertainty is involved in the estimation of particle porosity and tortuosity. The porosity can be determined by mercury or nitrogen porosimetry. The best way is to experimentally determine the effective diffusion coefficient at room temperature for a... 

D. Horak, J. Peska, F. Svec and J. Stamberg, The influence Effect of the porosity of discrete particles upon their apparent dimensions as measured by the Coulter principle. Powder Technology. 1982, lJi2), 263-268. 

Belbekhouch et al. [62] developed cellulose films with a focus on their application as gas barriers. Authors have produced cellulose films in the form of whiskers and MCC and investigated the effect of particle morphology on the transportation gas properties (carbon, nitrogen dioxide, and oxygen). It was observed that the cellulose films are more permeable to gasses when compared with the films of MCC, due to its high porosity provided by the crystalline nanoparticles. 

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