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Title: In situ x-ray imaging of nanoparticle agglomeration in fluidized beds

Abstract

A high spatial (down to 400 nm) and temporal resolution (down to 1 ms) x-ray imaging apparatus has been designed to study the agglomeration of arc plasma synthesized zinc oxide nanoparticles (average diameter of 50 nm) in fluidized beds under different gas flow velocities. The mean volume distribution of the nanoparticle agglomerates was determined with x-ray microtomography and found to correspond to a lognormal distribution with a mean value of 0.70x10{sup 9} {mu}m{sup 3} and a variance of 3.6x10{sup 21} ({mu}m{sup 3}){sup 2}. The average density of the agglomerates was found to be 2.9 g cm{sup -3} compared to 5.6 g cm{sup -3} for the individual nanoparticles. The powder assembly was then dynamically imaged using an x-ray image intensifier coupled to a digital camera using a field of view of 24.20 mm by 32.25 mm and a temporal resolution of 40 ms. Sequential frames were captured into computer memory for a range of gas flow velocities from 0.026 ms{sup -1} to 0.313 ms{sup -1}. The breakup energy of the agglomerates was calculated to be approximately 2x10{sup -8} J using a combination of dynamic observations and physical properties of the agglomerate system extracted from the x-ray microtomographic data.

Authors:
;  [1]
  1. Department of Physics, School of Electronics and Physical Sciences, University of Surrey, Guildford, Surrey, GU2 7XH (United Kingdom)
Publication Date:
OSTI Identifier:
20778632
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 88; Journal Issue: 3; Other Information: DOI: 10.1063/1.2166486; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; AGGLOMERATION; CAMERAS; DENSITY; DISTRIBUTION; FLUIDIZED BEDS; GAS FLOW; IMAGE INTENSIFIERS; IMAGE PROCESSING; NANOSTRUCTURES; PARTICLES; PLASMA; POWDERS; RESOLUTION; TOMOGRAPHY; VELOCITY; X RADIATION; ZINC OXIDES

Citation Formats

Jenneson, Paul Michael, and Gundogdu, Ozcan. In situ x-ray imaging of nanoparticle agglomeration in fluidized beds. United States: N. p., 2006. Web. doi:10.1063/1.2166486.
Jenneson, Paul Michael, & Gundogdu, Ozcan. In situ x-ray imaging of nanoparticle agglomeration in fluidized beds. United States. doi:10.1063/1.2166486.
Jenneson, Paul Michael, and Gundogdu, Ozcan. Mon . "In situ x-ray imaging of nanoparticle agglomeration in fluidized beds". United States. doi:10.1063/1.2166486.
@article{osti_20778632,
title = {In situ x-ray imaging of nanoparticle agglomeration in fluidized beds},
author = {Jenneson, Paul Michael and Gundogdu, Ozcan},
abstractNote = {A high spatial (down to 400 nm) and temporal resolution (down to 1 ms) x-ray imaging apparatus has been designed to study the agglomeration of arc plasma synthesized zinc oxide nanoparticles (average diameter of 50 nm) in fluidized beds under different gas flow velocities. The mean volume distribution of the nanoparticle agglomerates was determined with x-ray microtomography and found to correspond to a lognormal distribution with a mean value of 0.70x10{sup 9} {mu}m{sup 3} and a variance of 3.6x10{sup 21} ({mu}m{sup 3}){sup 2}. The average density of the agglomerates was found to be 2.9 g cm{sup -3} compared to 5.6 g cm{sup -3} for the individual nanoparticles. The powder assembly was then dynamically imaged using an x-ray image intensifier coupled to a digital camera using a field of view of 24.20 mm by 32.25 mm and a temporal resolution of 40 ms. Sequential frames were captured into computer memory for a range of gas flow velocities from 0.026 ms{sup -1} to 0.313 ms{sup -1}. The breakup energy of the agglomerates was calculated to be approximately 2x10{sup -8} J using a combination of dynamic observations and physical properties of the agglomerate system extracted from the x-ray microtomographic data.},
doi = {10.1063/1.2166486},
journal = {Applied Physics Letters},
number = 3,
volume = 88,
place = {United States},
year = {Mon Jan 16 00:00:00 EST 2006},
month = {Mon Jan 16 00:00:00 EST 2006}
}