[en] A scattered-light photometer system has been constructed and tested that monitors output of a nebulizer-type aerosol generator and controls nebulizing air pressure to maintain a constant generator output

[en] Well defined standard aerosols are very important for the validation and evaluation of particle size analysis equipment. An important requirement for an aerosol studies laboratory is the ability to generate monodispersed aerosols in the 0.1 to 10 micron range to calibrate air samplers, and in particular the popular cascade impactors. The May spinning-top aerosol generator has been adapted to generate monodisperse solid aerosols in the size range 1 - 6 micron with a standard deviation of 1.1. The problems experienced during this development work are described in detail. The aerosols produced were studied by means of optical microscopy and the scanning electron microscope (SEM), and a comparison of these two techniques has been made. (U.K.)

[en] For many purposes, it is highly desirable to produce uniform-sized particles rapidly in the range between 0.1 and 2 μm geometric diameter. A new condensation-type aerosol generator (designated MAGE) has been studied experimentally as a possible technique for the provision of test aerosols of this type. These studies have shown that selection of the operating conditions, particularly the gas flow rates through the system and reheater temperature, is required if aerosols of acceptable monodispersity are to be produced. (author)

[en] A microprocessor controlled inhalation exposure system (MCIES) has been built to automate aerosol generation, exposure time and aerosol sampling for animal toxicity studies. The system has a time resolution of 0.1 second and automatically sequences the exposure events from initiation to termination of the exposure. The operator is required to preset all airflows, read in a paper tape containing the time sequence of events and initiate the automatic sequence by closing a switch

No abstract available

[en] Spherical lanthanum aluminate powders approximately μm in diameter were produced using spray pyrolysis techniques. These materials were characterized by Z-ray diffractometry and scanning electron microscopy. Two intermediate products were produced and identified as lanthanum oxide and aluminum oxide. These intermediates were present in varying amounts in all of the aerosol-furnace-prepared materials and reflect the short residence time of the aerosols in the furnace. Samples of each aerosol-furnace preparation were further annealed in air for 1 h at 1100 C, and all of them converted completely to lanthanum aluminate

[en] A multi-scale aerosol particulates generator has been developed. It can generate three scales of 0.32, 0.98 and 2.8 μm sodium fluorescein particulates. It can be applied in the study of aerosol science and environment science

[en] A monodispersed aerosol exposure system for dogs is described and data are presented on aerosol depositions in the exposure system which could affect the aerosol presented to the animals by reducing the concentration and changing the particle size distribution

[en] Apparatus and techniques have been developed to expose experimental animals to aerosols of benzo(a)pyrene, a chemical carcinogen found in urban atmospheres and tobacco smoke. (U.S.)

[en] This study was initiated to provide a means to evaluate the mechanism of formation of condensation aerosols from highly supersaturated vapors and to establish experimental conditions to generate condensation aerosols of multicomponent mixtures of trace metals suitable for inhalation studies. Preliminary data on the nature of mixed trace metal oxide aerosols formed from Y₂O₃, a low vapor pressure material, and V₂O₅, a material with relatively higher vapor pressure, are reported. Ultrafine particles were formed by vapor condensation process. The low vapor pressure material Y₂O₃ appeared to have formed the embryo nuclei