Fractal hole growth in strained block copolymer films

Nagraj Koneripalli, Frank S. Bates, Glenn H. Fredrickson

Research output: Contribution to journalArticlepeer-review

37 Scopus citations


The evolution of surface topography in conformationally strained diblock copolymer films comprised of 3/2 lamellar bilayers was investigated by optical microscopy. Films of thickness 1.25D* < L < 1.5D* developed two-dimensional isotropic fractal holes with df = 1.67 following heterogeneous nucleation, where D* is the equilibrium lamellar spacing. A microscopic theory is presented that maps this hydrostatic tension driven hole growth instability onto the classical description of pattern formation during solidification.

Original languageEnglish (US)
Pages (from-to)1861-1864
Number of pages4
JournalPhysical review letters
Issue number9
StatePublished - 1998


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