The Big Problem of Small Particles:  A Comparison of Methods for Determination of Particle Size in Nanocrystalline Anatase Powders

A. Weibel; R. Bouchet; F. Boulc'; P. Knauth

doi:10.1021/cm0403762

The Big Problem of Small Particles: A Comparison of Methods for Determination of Particle Size in Nanocrystalline Anatase Powders

Chemistry of Materials ◽

10.1021/cm0403762 ◽

2005 ◽

Vol 17 (9) ◽

pp. 2378-2385 ◽

Cited By ~ 199

Author(s):

A. Weibel ◽

R. Bouchet ◽

F. Boulc' ◽

P. Knauth

Keyword(s):

Particle Size ◽

Comparison Of Methods ◽

Small Particles

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The relative resistance to escape of leaf and stem particles from the rumen of cattle and sheep

The Journal of Agricultural Science ◽

10.1017/s0021859600055623 ◽

1985 ◽

Vol 105 (1) ◽

pp. 9-14 ◽

Cited By ~ 55

Author(s):

D. P. Poppi ◽

R. E. Hendricksen ◽

D. J. Minson

Keyword(s):

Particle Size ◽

Animal Species ◽

Particle Sizes ◽

Small Particles ◽

Relative Resistance ◽

Stages Of Growth ◽

Two Stages ◽

Wet Sieving ◽

Cattle And Sheep

SUMMARYIn a study of the effect of animal species on the threshold particle size leaving the rumen, two grasses cut at two stages of growth and one mature legume were separated into leaf and stem fractions and fed to cattle and sheep. Samples of rumen digesta and faeces were used to determine the validity of using a 1·18 mm porosity screen to separate the rumen particles into large and small pools when studying escape of particles from the rumen. Samples of rumen digesta and faeces were collected for the determination of particle size by wet sieving and the calculation of resistance of particles to passage from the rumen relative to small particles retained on a 0·15 mm sieve.Particles < 1·18 mm but > 0·5 mm had a mean relative resistance to passage of 2·0 and 2·6 for cattle and sheep respectively, compared with resistance values of between 10·9 and 31·2 for particles between 1·18 and 2·36 mm. It is suggested that there is no justification for using different threshold particle sizes for sheep and cattle and that a 1·18 mm sieve may be used to divide the rumen contents of both cattle and sheep into two pools of particles with high and low relative resistance to passage from the rumen.

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