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What is the size of fine clay particles in USDA? 

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It is concluded that for a preliminary survey of the particle size and shape of clay minerals the technique of electron microscopy is best.
The ratio of different sizes of transported sediment to the soil matrix indicates that most of the clay was eroded in the form of aggregates, silt-size particles were transported mainly as primary particles, and sand-size particles were predominantly aggregates of finer particles.
Analysis of particle size fractions indicates the extent to which137Cs may be enriched in the clay size fractions of both tine and coarse sediments.
Book ChapterDOI
01 Jan 1998
7 Citations
This is because of the high surface area of the fine particles and because of the inherent structural features of certain clay minerals.
In the past, nanoparticles have not been specifically distinguished from clay sized particles and thus are classified as clay size particles, probably due to the lack of advanced facilities for nano characterization and imaging.
The chemical analyses of clay size particles supplied by high resolution STEM-EDX has great potential for investigating the location of elements within minerals in the clay fraction.
The results illustrate that the clay particles were broken down to smaller and smaller sizes with increase of pre-mixing temperature and especially with increase in pre-mixing speed.
The discrepancies are shown to be due to heterogeneous diffusivities arising from the proximity of the surface of clay particles.
The results were consistent with the aggregation of fine clay particles, possibly due to the known hydrolysis behavior of the sodium polyphosphate dispersants used in the experiment.

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