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Difference between fractal dimension determined by surface profilometry and Hg poros.

  1. Jan 26, 2010 #1
    What is the difference between fractal dimension determined by surface profilometry and Hg porosimetry?
    For example, for a given dataset, say samples 1-5, the backbone fractal dimension determined by Hg porosimetry increases from 2.5 to 3 (the percolation fractality is 3 for all samples).
    For Surface profilometry determined on a 2D surface (not a line!) with z as the third dimension, the data is exactly inversed, it decreases from 3 to 2.5
    (see example data below)
    Why?

    What is the difference between the two methods?

    thanks.

    Data# Hg Profilom.
    1 2.5 3
    2 2.6 2.9
    3 2.7 2.8
    4 2.8 2.7
    5 2.9 2.5
     
  2. jcsd
  3. Jan 29, 2010 #2
    Re: Difference between fractal dimension determined by surface profilometry and Hg po

    Perhaps I am missing something...but those experiments don't measure the same thing. Profilometry will give you a wet blanket approximation of the surface. It has no information about the internal structure or surface area under the measured hyperplane. Porosimetry basically gives the opposite result in high surface area materials...it gives most of the internal surfaces but no relational geometry....the total geometry is realized by putting Both of the datasets together.
     
  4. Jan 29, 2010 #3
    Re: Difference between fractal dimension determined by surface profilometry and Hg po

    Thanks for your reply.

    Thant might be it.
    I also thought that one output is the outer blanket, and the other the internal structure, but outer or inner surface would have the same characteristics, no?
    Anyways, your explanation might explain why they don't correlate linearly, but with inversely.

    Thx.
     
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