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Three-dimensional textures and defects of soft material layering revealed by thermal sublimation

Layering is found and exploited in a variety of soft material systems, ranging from complex macromolecular self-assemblies to block copolymer and small-molecule liquid crystals. Because the control of layer structure is required for applications and characterization, and because defects reveal key f... Full description

Journal Title: Proceedings of the National Academy of Sciences 26 November 2013, Vol.110(48), p.19263
Main Author: Dong Ki Yoon
Other Authors: Yun Ho Kim , Dae Seok Kim , Seong Dae Oh , Ivan I. Smalyukh , Noel A. Clark , Hee-Tae Jung
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: ISSN: 0027-8424 ; E-ISSN: 1091-6490 ; DOI: 10.1073/pnas.1317922110
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recordid: pnas_s110_48_19263
title: Three-dimensional textures and defects of soft material layering revealed by thermal sublimation
format: Article
creator:
  • Dong Ki Yoon
  • Yun Ho Kim
  • Dae Seok Kim
  • Seong Dae Oh
  • Ivan I. Smalyukh
  • Noel A. Clark
  • Hee-Tae Jung
subjects:
  • Sciences (General)
ispartof: Proceedings of the National Academy of Sciences, 26 November 2013, Vol.110(48), p.19263
description: Layering is found and exploited in a variety of soft material systems, ranging from complex macromolecular self-assemblies to block copolymer and small-molecule liquid crystals. Because the control of layer structure is required for applications and characterization, and because defects reveal key features of the symmetries of layered phases, a variety of techniques have been developed for the study of soft-layer structure and defects, including X-ray diffraction and visualization using optical transmission and fluorescence confocal polarizing microscopy, atomic force microscopy, and SEM and transmission electron microscopy, including freeze-fracture transmission electron microscopy. Here, it is shown that thermal sublimation can be usefully combined with such techniques to enable visualization of the 3D structure of soft materials. Sequential sublimation removes material in a stepwise fashion, leaving a remnant layer structure largely unchanged and viewable using SEM, as demonstrated here using a lamellar smectic liquid crystal. sublime | direct visualization www.pnas.org/cgi/doi/10.1073/pnas.1317922110
language: eng
source:
identifier: ISSN: 0027-8424 ; E-ISSN: 1091-6490 ; DOI: 10.1073/pnas.1317922110
fulltext: fulltext_linktorsrc
issn:
  • 0027-8424
  • 00278424
  • 1091-6490
  • 10916490
url: Link


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descriptionLayering is found and exploited in a variety of soft material systems, ranging from complex macromolecular self-assemblies to block copolymer and small-molecule liquid crystals. Because the control of layer structure is required for applications and characterization, and because defects reveal key features of the symmetries of layered phases, a variety of techniques have been developed for the study of soft-layer structure and defects, including X-ray diffraction and visualization using optical transmission and fluorescence confocal polarizing microscopy, atomic force microscopy, and SEM and transmission electron microscopy, including freeze-fracture transmission electron microscopy. Here, it is shown that thermal sublimation can be usefully combined with such techniques to enable visualization of the 3D structure of soft materials. Sequential sublimation removes material in a stepwise fashion, leaving a remnant layer structure largely unchanged and viewable using SEM, as demonstrated here using a lamellar smectic liquid crystal. sublime | direct visualization www.pnas.org/cgi/doi/10.1073/pnas.1317922110
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