Problems and Prospects of Submicron Particle Size Measurement PDF Download
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Author: M. Arakawa
Publisher:
ISBN:
Category :
Languages : en
Pages : 14
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Author: M. Arakawa
Publisher:
ISBN:
Category :
Languages : en
Pages : 14
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Author: James F. Driscoll
Publisher:
ISBN:
Category :
Languages : en
Pages : 31
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The one year research program described here was a direct extension of work completed during the 1977 AFOSR/ASEE Summer Faculty Research program at AFRPL. During that program the author and Dr. David Mann, AFRPL, performed the first is situ size measurements of submicron alumina (Al2O3) particles that have been published to date. The new laser diagnostic technique used, Diffusion Broadening Spectroscopy, represents a new advance in the state-of-the-art of submicron particle sizing. The goal of the research described herein was to develop a data reduction procedure to extend the applicability of the technique, so that size distribution half width can be measured, in addition to particle mean diameter. The computer routine was developed to determine particle mean diameter and size distribution half width, given light scattering data obtained at two scattering angles. Sensitivity of the results was investigated and feasibility of future use of the technique in rocket motors and plumes was deduced. (Author).
Author: N G Stanley-Wood
Publisher: Royal Society of Chemistry
ISBN: 1847551629
Category : Science
Languages : en
Pages : 557
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Book Description
Particle Size Analysis reviews the development of particle characterization over the past 25 years and also speculates on its future. Interest in the subject has increased enormously over the years and this book highlights the changes and advances made within the field. This book is comprehensive in its coverage of particle size analysis and includes contributions on such characterization techniques as microscopy using fractal analysis, light diffraction, light scattering with the phase doppler technique, light observation, and photon correlation spectroscopy. A number of chapters address the interest in on-line in-stream particle size analysis and illustrate the progress being made in achieving this long sought after ideal of in-situ in-process particle characterization. Applications to other technological fields are detailed by chapters covering biological systems and the pharmaceutical industry. The subject of surface area determination is considered with particular emphasis on the measurements on porosity of powders, the characterization and comparability of reference materials, and the need for standards. Particle Size Analysis should provide stimulating reading for technologists, scientists, and engineers involved in particle characterization and powder technology worldwide.
Author: Wai K. Cheng
Publisher:
ISBN:
Category :
Languages : en
Pages : 93
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A theoretical and experimental study on the feasibility of determining the size of a single submicron particle by observing its Brownian motion characteristics has been carried out. The method is based on measurement of the particle motion interferometrically using the light scattered from a pair of intersecting laser beams. The particle is assumed to be in thermal equilibrium with a fluid medium. due to the viscous damping of the fluid, the motion of the particle exhibits relaxation behavior. The relaxation time may be obtained from the interference signal. Knowing the temperature and the viscosity of the fluid, the mass, hence the size of the particle may be determined from the relaxation time. Monte Carlo simulation of the Brownian motion detector response has shown that the relaxation time may be obtained from the statistics of the time between extrema of the signal. A proof-of-concept experiment was conducted using latex spheres of known sizes as test particles. The signal to noise ratio of the experimental setup, however, was not adequate for determining the size of the particles.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 296
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Author: Matthew Darren Wright
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Author: Terence Allen
Publisher: Springer
ISBN: 1489930639
Category : Technology & Engineering
Languages : en
Pages : 700
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Book Description
Although man's environment, from the interstellar dust to the earth beneath his feet, is composed to a large extent of finely divided material, his knowledge of the propert ies of such materials is surprisingly slight. For many years the scientist has accepted that matter may exist as solids, liquids or gases although the dividing line between the states may often be rather blurred; this classification has been upset by powders, which at rest are solids, when aerated may behave as liquids, and when suspended in gases take on some of the properties of gases. It is now widely recognized that powder technology is a field of study in its own right. The industrial applications of this new science are far reaching. The size of fine particles affects the properties of a powder in many important ways. For example, it determines the setting time of cement, the hiding power of pigments and the activity of chemical catalysts; the taste of food, the potency of drugs and the sintering shrink age of metallurgical powders are also strongly affected by the size of the particles of which the powder is made up. Particle size measurement is to powder technology as thermometry is to the study of heat and is in the same state of flux as thermometry was in its early days. Only in the case of a sphere can the size of a particle be completely described by one number.
Author: Air Pollution Technology, inc
Publisher:
ISBN:
Category : Air
Languages : en
Pages : 0
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The project is one of several (RP414, 463) supported by EPRI to develop instrumentation for quantitative measurement of particle size distribution and subsequently the fractional efficiency of particulate control devices installed on coal fired utility boilers. A review of particle collection on the wire mesh screens used in the A.P.T. Screen Diffusion Battery (SDB) is presented. The study reports experiments performed on arrays of parallel wires. The results verify the theory of particle collection on single cylinders. A mathematical model is presented for determining submicron particle size distributions from screen diffusion battery data.
Author: Keith E. McCurdy
Publisher:
ISBN:
Category :
Languages : en
Pages : 36
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Few nonintrusive techniques are available for particle measurement in the submicron size range (
Author:
Publisher:
ISBN:
Category : Environmental health
Languages : en
Pages : 388
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