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Fiber classification and the influence of average air humidity.

Authors
Wang-ZC; Hopke-PK; Baron-PA; Ahmadi-G; Cheng-YS; Deye-G; Su-WC
Source
Aerosol Sci Tech 2005 Nov; 39(11):1056-1063
NIOSHTIC No.
20029140
Abstract
The use of man-made vitreous fibers (MMVFs) as a substitute for asbestos in industrial and residential applications has raised the concerns of the potential hazards associated with inhalable aerosolized fibers. The complex movement of fiber makes it difficult to predict the pattern of fiber deposition in human airways from the behavior of spherical particles. Difficulties in producing monodisperse length fibers has been an obstacle to study fibrous particle deposition in the human respiratory system. To address this problem, a narrow length distribution of fibers was generated using dielectrophoretic classification. Dielectrophoresis is the motion of neutral matter in a nonuniform electric field due to an induced dipole moment. It is sensitive to the conductivity of the matter in the field. A fiber classifier has been used to study the influence of atmospheric humidity on the behavior of glass fibers. Glass fibers, as insulators, can not be classified by the dielectrophoretic classifier. However, our study shows that a humidity higher than 15% RH can change the conductivity of the glass fibers so as to permit their effective classification.
Keywords
Airborne-fibers; Aerosols; Aerosol-particles; Occupational-hazards; Asbestos-fibers; Asbestos-dust; Particulates; Particulate-dust; Occupational-health; Humidity
CODEN
ASTYDQ
Publication Date
20051101
Document Type
Journal Article
Funding Type
Construction; Grant
Fiscal Year
2006
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-003900
Issue of Publication
11
ISSN
0278-6826
NIOSH Division
DART
Source Name
Aerosol Science and Technology
State
OH; NM; NY
Performing Organization
Lovelace Biomedical & Environmental Research, Albuquerque, New Mexico
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