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Title: Reversible monolayer-to-crystalline phase transition in amphiphilic silsesquioxane at the air-water interface

Journal Article · · Scientific Reports
DOI:https://doi.org/10.1038/srep08497· OSTI ID:1203602
 [1];  [1];  [1];  [2];  [3];  [3]
  1. Saha Inst. of Nuclear Physics (India)
  2. Univ. du Maine (France)
  3. Univ. of Chicago, IL (United States). Center for Advanced Radiation Sources (CARS)

We report on the counter intuitive reversible crystallisation of two-dimensional monolayer of Trisilanolisobutyl Polyhedral Oligomeric SilSesquioxane (TBPOSS) on water surface using synchrotron x-ray scattering measurements. Amphiphilic TBPOSS form rugged monolayers and Grazing Incidence X-ray Scattering (GIXS) measurements reveal that the in-plane inter-particle correlation peaks, characteristic of two-dimensional system, observed before transition is replaced by intense localized spots after transition. The measured x-ray scattering data of the non-equilibrium crystalline phase on the air-water interface could be explained with a model that assumes periodic stacking of the TBPOSS dimers. These crystalline stacking relaxes upon decompression and the TBPOSS layer retains its initial monolayer state. The existence of these crystals in compressed phase is confirmed by atomic force microscopy measurements by lifting the materials on a solid substrate.

Research Organization:
Univ. of Chicago, IL (United States). Center for Advanced Radiation Sources (CARS), Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1203602
Journal Information:
Scientific Reports, Vol. 5; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 6 works
Citation information provided by
Web of Science

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