Monodisperse aerosol

Aerosol, monodisperse An aerosol with a size-distribution function described by a geometrical standard deviation less than 1.15. If the deviation is between 1.15 and 1.5, it is classified as a quasi-mono-disperse aerosol. 

Primarily because of the lack of adequate experimental techniques (particularly, the produc tion of appropriate monodisperse aerosols), there has been no comprehensive experimental test of any of the venturi-scrubber models over wide ranges of design and operating variables. The models for other types of scrubbers appear to be essentially untested. 

MAGIC (Monodisperse Aerosol Generating Interface for Chromatography), Thermabeam and Universal interfaces. 

After aerosols are produced, various optical techniques can be used to determine their actual sizes and concentrations prior to introducing the aerosols to a sampling device. Various sizes of monodisperse aerosols can be introduced to the sampler, and its efficiency determined by measuring breakthrough using optical techniques and by... 

In the past few years, a range of solvation dynamics experiments have been demonstrated for reverse micellar systems. Reverse micelles form when a polar solvent is sequestered by surfactant molecules in a continuous nonpolar solvent. The interaction of the surfactant polar headgroups with the polar solvent can result in the formation of a well-defined solvent pool. Many different kinds of surfactants have been used to form reverse micelles. However, the structure and dynamics of reverse micelles created with Aerosol-OT (AOT) have been most frequently studied. AOT reverse micelles are monodisperse, spherical water droplets [32]. The micellar size is directly related to the water volume-to-surfactant surface area ratio defined as the molar ratio of water to AOT,... 

Mewhinney JA, Muggenburg BA. 1977. Patterns of dose after inhalation of monodisperse or polydisperse aerosols. In Boecker BB, Hobbs CH, Martinez BS, eds. Inhalation Toxicology Research Institute annual report Lovelace Biomedical and Environmental Research Institute. Albuquerque, NM Inhalation Toxicology Research Institute, 44-47. 

The droplet size delivered from a vibrating orifice monodisperse aerosol generator can be derived from the following expressions ... 

An alternative method of calibration involves the dispersion of monodisperse polystyrene microparticles. This has recently been made an efficient process by the incorporation of these particles in pMDI suspension to allow for metering of small well-dispersed boluses sufficient for use as aerosol calibration standards [43]. 

RN Berglund, BYH Liu. Generation of monodisperse aerosol standards. Environ Sci Technol 7 147-152, 1973. 

PR Byron, AJ Hickey. Spinning-disk generation and drying of monodisperse solid aerosols with output concentrations sufficient for single-breath inhalation studies. J Pharm Sci 76 60-64, 1987. 

A four point (n = 4) approximation is adequate since 3 does not change much when 5 and 6 point approximations are used It is apparent that if Og = 1 (a monodisperse aerosol) equation (14) reduces to the hybrid theory with the CMD in place of the diameter. 

Unattached fractions of RaA (at t = °°) for two mine aerosols and for a typical room aerosol are shown in Table III. It is usually assumed that the attachment of radon progeny to aerosols of CMD < 0.1 ym follows the kinetic theory. In Table III it is apparent that the hybrid and kinetic theories predict similar unattached fractions for monodisperse aerosols. However, for more polydisperse aerosols, the kinetic theory predicts lower unattached fractions than the diffusion theory and thus the diffusion theory is the more appropriate theory to use. It is also evident that the kinetic-diffusion approximation predicts unattached fractions similar to those predicted by the hybrid theory in all cases. 

The nature of the data discussed here is in part consistent with recent work by other authors who suggested a sticking coefficient of less than unity, under certain conditions, for the attachment of Po-218 to monodisperse aerosols (Ho et al., 1982), and to surfaces (Holub, 1984). 

Determination of the Attachment Coefficients of Atoms and Ions on Monodisperse Aerosols, J. of Aerosol Science 10 21-28 (1979). 

R.C. Willoughby and R.F. Browner, Monodisperse aerosol generation interface for combining liquid chromatography with mass spectrometry, Anal. Chem., 56 (1984) 2625-2631. 

A similar technique has been applied to the generation of monodisperse suspensions in water. This type of method was first used in medical field and then widely used to spray monodisperse solid particles such as polystyrene latex particles. Aerosols of solutes have also been produced by atomizing solutions of salt, sugar or methylene blue dye dissolved in water. In practical operations, a low concentration of solid particles in a solvent is recommended in order to avoid possible agglomeration of suspensions in the solvent. 

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