Random dense branching

PAGES 226 227 last sentence on page 226 continuing onto 227 spaces), ideal randomly branched polymers become too dense as reflected in the overlap parameter decreasing with degree of polymerization " increasing is replaced by "decreasing . 

Fig. 26.3 Variants of microstructure of the PSi layers fabricated using different parameters of emodization (A) (variants of branching) (a) (smooth pore wall) (b) (branches shorter than diameter) (c) (second level branches only) (d) (dendritic branches) (e) (main pores with second and third level branches) (f) (dense, random, and short branched) (B) (depth variation of PSi layer) (a) (single layer of microporous Si) (b) (single layer of macroporous Si with smaller pores near the surface) (c) a layer of micropores Si on the top of macropores Si (Idea from Zhang 2(X)5)...

The term pore morphology is used for such properties as shape (smooth, branched, faceted, etc.), orientation, interconnection of pores, etc. The morphology is the least quantifiable aspect of porous silicon. We understand that it is difficult to characterize systematically the morphology of porous silicon, which has extremely rich details with respect to variations in pore size, shape, and spatial distribution. For example, microporous andmesoporous sihcon typically exhibit a sponge-like structure with densely and randomly branched pores. The tendency to branching increases with decrease of pore diameter. 

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