Abstract
The separation of airborne fibers by length and diameter is essential for evaluating inhalation dosimetry, understanding mechanisms of toxicity, and estimating risk to humans from inhaled fibers. Aerodynamic separation of fibrous aerosols depends strongly on fiber diameter and weakly on fiber length. Theoretical calculations show that thin, long fibers can be separated from particles by using differences in their electric mobilities. Fiber separation by length under the influence of electrophoretic forces and dielectrophoretic forces was calculated in a design model for fibers 20, 10, and 3 μm in length and 1 μm in diameter. Electrophoresis describes the motion of a charged object in an electric field, whereas dielectrophoresis describes the motion of neutral matter in a nonuniform electric field. Based on simulation results, 1-μm-diameter fibers having aspect ratios of 20, 10, and 3 can be separated from each other by electrophoresis if the charge ratio on these fibers is 10:5:1, respectively. Twenty-mic...
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