In fact, a large number of core electron macroscope scanning images show that there are many organic pores existing in the shale matrix, the scale of which ranges from nanometer to
macrometer. Previous studies considered the matrix pores as a whole without separating nanometer pores and macropores.
Bonfante, "Osseointegration: hierarchical designing encompassing the
macrometer, micrometer, and nanometer length scales," Dental Materials, vol.
This behavior states that a continuous decrease of the particle size coming from a
macrometer size down to nanometer demands the turbidity to increase, passes a maximum and reduce again.