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Title: Dewetting in immiscible polymer bilayer films

We have measured in situ the progression of dewetting from a large number of holes in immiscible polymer bilayer films. Using x-ray photon correlation spectroscopy (XPCS) in grazing incidence we probe independently the evolving dewetting process both at the top surface and the buried interface of the bilayer. At an early stage, differences in the evolution of the velocities measured by XPCS between the surface and buried interface indicate that the holes do not penetrate the bottom layer. The rim velocity at late stages decays according to a wave-vector-dependent power law, which indicates inhomogeneous flows in the film. The changes in the static scattering show that observed slow-down of the dewetting velocity is correlated with the changing roughness at the buried interface of the polymer bilayer.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ;  [8]
  1. Argonne National Lab. (ANL), Argonne, IL (United States). X-ray Science Division, and Intense Pulsed Neutron Source; Northern Illinois Univ., DeKalb, IL (United States). Dept. of Physics
  2. Argonne National Lab. (ANL), Argonne, IL (United States). Intense Pulsed Neutron Source
  3. Univ. of California, San Diego, CA (United States). Dept. of Physics
  4. Argonne National Lab. (ANL), Argonne, IL (United States). X-ray Science Division
  5. Brookhaven National Lab. (BNL), Upton, NY (United States). NSLS-II
  6. Argonne National Lab. (ANL), Argonne, IL (United States). Nanoscience and Technology Division
  7. Northern Illinois Univ., DeKalb, IL (United States). Dept. of Physics
  8. McGill Univ., Montreal, QC (Canada). Dept of Physics
Publication Date:
Report Number(s):
BNL-203454-2018-JAAM
Journal ID: ISSN 2475-9953; PRMHAR; 127301
Grant/Contract Number:
AC02-06CH11357; SC0012704
Type:
Accepted Manuscript
Journal Name:
Physical Review Materials
Additional Journal Information:
Journal Volume: 1; Journal Issue: 1; Journal ID: ISSN 2475-9953
Publisher:
American Physical Society (APS)
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1433057
Alternate Identifier(s):
OSTI ID: 1364220; OSTI ID: 1433945