Log-normal Particle Size Distribution Research Articles

The generation of aerosols from various electrolyte solutions

A series of electrolytes, CuSO 4, MnSO 4, ZnSO 4, CuCl 2, NaCl, and Th(NO 3) 4, were dispersed from 0.1 to 10.0 weight per cent solutions with a modified Dautrebande type aerosol generator. Log normal particle size distributions were obtained and varied with each electrolyte, as well as with solvents and solution concentrations up to 5.0–10.0 weight per cent. Relationships between particle sizes and number concentrations of aerosols nebulized from different solvents are influenced by the surface tensions of the solvents. Results of 1% solutions of CuCl 2 in water and methanol were in fair agreement with theoretical calculations. For a given dispersant concentration in aqueous solution, the concentration of electrolyte in the aerosol output and the mean volume diameters obtained from log normal particle size distributions increased approximately in the same order: Th(NO 3) 4, NaCl, CuCl 2, ZnSO 4, MnSO 4, CuSO 4. This is attributed to a variation of resistance to particle agglomeration by surface charges on the droplets of mist. Electrical field intensities at the external drop surface estimated from the method of Dukhin and Derjaguin are in qualitative agreement with this order of particle sizes. For a given electrolyte, the mean volume diameter increased with dispersant concentration in the following ranges: ▪

Characteristics of experimental cis‐1,4‐polyisoprene latices

AbstractExperimental latices of synthetic cis‐1,4‐polyisoprene and films and cellular objects produced from them are described. The latices of the synthetic polymers with molecular weights of about 2,000,000 are stabilized by anionic surfactants and have weight median particle diameters of about 0.9 μ and log normal particle size distribution. Tensile properties and flow characteristics of unvulcanized latex films could be regulated by introduction of controlled, small, amounts of crosslinking into the latex. Procedures used for crosslink density determination on cis‐polyisoprene latex at various stages of use are described. Vulcanized latex films having maximum tensile strengths (5500–6000 p.s.i. and 800–950% elongation) were obtained when the final crosslink density was in the range 1.0–1.6 × 10−4 moles of effective chains/cc. Use of the synthetic cis‐polyisoprene latex in production of foam is described. Gelation with sodium silicofluoride at room temperature occurs within 2–10 minutes. Production of a controlled level of crosslinking in the latex prior to frothing and gelling was found to improve the uniformity of cell structure of foams and to increase their resistance to compression. Excessive crosslinking in the latex during maturation was shown to cause a loss of tensile strength in cured products presumably because the coalescence of latex particles during gelation is adversely affected. The properties of synthetic cis‐1,4‐polyisoprene latices and the physical properties of films and foams derived from them are shown in general to be very similar to those of natural rubber latex and its products.

On the determination of particle size distribution in polydisperse aerosols by the diffusion method

The curves of penetration of polydisperse aerosols with log-normal particle size distribution (rg = 10-7-10-5 cm, log βg = 0-0.4) through a parallel-walled channel as functions of the rate of flow and of the dimensions of the channel were calculated by means of an electronic computer. With the help of these curves the particle size distribution in such aerosols can be found by Townsend's method.

The Interpretation of Abnormalities in the Log-Normal Distribution of Particle Size

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Interpretation of Abnormalities in the Log-Normal Distribution of Particle SizeRiyad R. IraniCite this: J. Phys. Chem. 1959, 63, 10, 1603–1607Publication Date (Print):October 1, 1959Publication History Published online1 May 2002Published inissue 1 October 1959https://doi.org/10.1021/j150580a010RIGHTS & PERMISSIONSArticle Views152Altmetric-Citations28LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (514 KB) Get e-Alerts