Particle & Particle Systems Characterization

Cover image for Particle & Particle Systems Characterization

December, 2010

Volume 27, Issue 1-2

Pages 3–61

  1. Contents

    1. Top of page
    2. Contents
    3. Research Articles
    4. Calendar
    5. Instructions for Authors
    1. Contents: Part. Part. Syst. Charact. 1-2/2010 (pages 3–5)

      Article first published online: 27 JAN 2011 | DOI: 10.1002/ppsc.201190000

  2. Research Articles

    1. Top of page
    2. Contents
    3. Research Articles
    4. Calendar
    5. Instructions for Authors
    1. Mean Particle Diameters. Part VI: Fundamental Distinction between Statistics Based (ISO/DIN) and Physics Based (Moment-Ratio) Definition Systems (pages 7–20)

      Maarten Alderliesten

      Article first published online: 3 DEC 2010 | DOI: 10.1002/ppsc.201000002

      This paper discusses two distinct methods to define mean particle diameters, namely the statistics based ISO/DIN method and the physics based Moment-Ratio (M-R) method. The M-R method enables the user to derive mathematically or select empirically the type of mean diameter from the physical product or process property to be described by that mean diameter. The application of both definition methods to theoretical derivation and to empirical selection of that type of mean diameter is evaluated. Although the ways of defining mean particle diameters according to both methods differ mathematically, a clear mathematical relationship exists.

    2. Distortion of Single-Particle Optical Sensing (SPOS) Particle Count by Sub-Countable Particles (pages 21–31)

      Bruno Tolla and David Boldridge

      Article first published online: 3 DEC 2010 | DOI: 10.1002/ppsc.200900081

      Single particle optical sensing (SPOS) is a highly sensitive particle characterization technique for the measurement of particles in the size range above 0.5 μm. In this paper the SPOS technique is examined to measure the large particle tail for fumed silica dispersions which have a mass mean particle size of ∼140 nm. A strong influence of the sample concentration is demonstrated and the reasons – namely secondary coincidence – discussed in detail. These findings establish the limited range of reliability for SPOS measurements when used to measure a small fraction of the total particle size distribution.

    3. A Heuristic Model of Twin Fluid Internally Mixed Atomization using Distributed Weber Number Criterion (pages 32–41)

      Abhijit Kushari

      Article first published online: 3 DEC 2010 | DOI: 10.1002/ppsc.201000009

      This paper describes the development and predictions of a model that depicts the two-phase flow within an internally mixed air-assisted liquid atomizer using a statistical Weber number criterion. The liquid flow rates and mean droplet sizes under different operating conditions, predicted by the model, are compared with the experimental data and they are found to be in fair agreement with each other.

    4. Effect of Mixing on the Pore Structure of Alumina Extrudates (pages 42–47)

      John Landers, Mukundan Devadas, Alexander V. Neimark, Hye-Kyung Timken, Adeola Ojo and Arthur W. Chester

      Article first published online: 10 DEC 2010 | DOI: 10.1002/ppsc.200900093

      The mixing conditions have a direct impact on the pore structure of alumina extrudates. We study the pore structure of samples prepared with two mixers: a standard Eirich mixer and a smaller yet more severe Fukae mixer, which operates at 1500 rpm. We present the development of a bimodal pore size distribution within the range of 25–150 Å produced by using the Fukae mixer. The pore structure consists of larger pores that grow at the expense of the smaller ones and can be tuned as a function of mixing time.

    5. Oxidation of Nanometer-Sized Titanium Nitride and Micrometer-Sized Titanium Particles with Titanium Nitride Traces up to 1473 K in Air (pages 48–58)

      Olga Schulz, Norbert Eisenreich, Harald Fietzek, Maria del Mar Juez-Lorenzo and Evgenii Kondratenko

      Article first published online: 10 DEC 2010 | DOI: 10.1002/ppsc.201000020

      This study compares the oxidation behaviour of TiN particles (nanometer-sized to micrometer-sized) to titanium particles with traces of titanium nitride (micrometer-sized) regarding the similarities of the formation of the products. These particles were investigated between 323 K and 1473 K in air using high-temperature X-ray diffraction, SEM, and the methods of thermal analysis (TG and DSC). The formation of different crystalline structures by oxidation is shown and a diffusion model was utilized for describing the oxidation kinetics. A fairly good agreement between predictions and measurements has been proved. A kinetic model for the oxidation of Ti and TiN has been established together with the corresponding parameters.

  3. Calendar

    1. Top of page
    2. Contents
    3. Research Articles
    4. Calendar
    5. Instructions for Authors
  4. Instructions for Authors

    1. Top of page
    2. Contents
    3. Research Articles
    4. Calendar
    5. Instructions for Authors

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