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Title: Block Copolymer Nanocomposites in Electric Fields: Kinetics of Alignment

Abstract

We investigate the kinetics of block copolymer/nanoparticle composite alignment in an electric field using in situ transmission small-angle X-ray scattering. As a model system, we employ a lamellae forming polystyrene-block-poly(2-vinyl pyridine) block copolymer with different contents of gold nanoparticles in thick films under solvent vapor annealing. While the alignment improves with increasing nanoparticle fraction, the kinetics slows down. This is explained by changes in the degree of phase separation and viscosity. Our findings provide extended insights into the basics of nanocomposite alignment.

Authors:
 [1];  [1];  [2];  [1];  [3];  [2];  [3];  [4];  [1]
  1. RWTH Aachen University
  2. ORNL
  3. Hebrew University of Jerusalem
  4. European Synchrotron Radiation Facility (ESRF)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1061573
DOE Contract Number:
DE-AC05-00OR22725
Resource Type:
Journal Article
Resource Relation:
Journal Name: ACS Macro Letters; Journal Volume: 2; Journal Issue: 1
Country of Publication:
United States
Language:
English

Citation Formats

Liedel, Clemens, Pester, Christian, Ruppel, Markus A, Lewin, Christian, Pavan, Mariela J., Urban, Volker S, Shenhar, Roy, Bosecke, Peter, and Boker, Alexander. Block Copolymer Nanocomposites in Electric Fields: Kinetics of Alignment. United States: N. p., 2013. Web. doi:10.1021/mz3005132.
Liedel, Clemens, Pester, Christian, Ruppel, Markus A, Lewin, Christian, Pavan, Mariela J., Urban, Volker S, Shenhar, Roy, Bosecke, Peter, & Boker, Alexander. Block Copolymer Nanocomposites in Electric Fields: Kinetics of Alignment. United States. doi:10.1021/mz3005132.
Liedel, Clemens, Pester, Christian, Ruppel, Markus A, Lewin, Christian, Pavan, Mariela J., Urban, Volker S, Shenhar, Roy, Bosecke, Peter, and Boker, Alexander. 2013. "Block Copolymer Nanocomposites in Electric Fields: Kinetics of Alignment". United States. doi:10.1021/mz3005132.
@article{osti_1061573,
title = {Block Copolymer Nanocomposites in Electric Fields: Kinetics of Alignment},
author = {Liedel, Clemens and Pester, Christian and Ruppel, Markus A and Lewin, Christian and Pavan, Mariela J. and Urban, Volker S and Shenhar, Roy and Bosecke, Peter and Boker, Alexander},
abstractNote = {We investigate the kinetics of block copolymer/nanoparticle composite alignment in an electric field using in situ transmission small-angle X-ray scattering. As a model system, we employ a lamellae forming polystyrene-block-poly(2-vinyl pyridine) block copolymer with different contents of gold nanoparticles in thick films under solvent vapor annealing. While the alignment improves with increasing nanoparticle fraction, the kinetics slows down. This is explained by changes in the degree of phase separation and viscosity. Our findings provide extended insights into the basics of nanocomposite alignment.},
doi = {10.1021/mz3005132},
journal = {ACS Macro Letters},
number = 1,
volume = 2,
place = {United States},
year = 2013,
month = 1
}
  • External electric fi elds readily align birefringent block-copolymer mesophases. In this study the effect of gold nanoparticles on the electric-fi eld-induced alignment of a lamellae-forming polystyrene- block -poly(2-vinylpyridine) copolymer is assessed. Nanoparticles are homogeneously dispersed in the styrenic phase and promote the quantitative alignment of lamellar domains by substantially lowering the critical field strength above which alignment proceeds. The results suggest that the electric-fi eldassisted alignment of nanostructured block copolymer/nanoparticle composites may offer a simple way to greatly mitigate structural and orientational defects of such fi lms under benign experimental conditions.
  • Block copolymers consisting of incompatible components self-assemble into microphase-separated domains yielding highly regular structures with characteristic length scales of the order of several tens of nanometres. Therefore, in the past decades, block copolymers have gained considerable potential for nanotechnological applications, such as in nanostructured networks and membranes, nanoparticle templates and high-density data storage media. However, the characteristic size of the resulting structures is usually determined by molecular parameters of the constituent polymer molecules and cannot easily be adjusted on demand. Here, we show that electric d.c. fields can be used to tune the characteristic spacing of a block-copolymer nanostructure withmore » high accuracy by as much as 6% in a fully reversible way on a timescale in the range of several milliseconds. We discuss the influence of various physical parameters on the tuning process and study the time response of the nanostructure to the applied field. A tentative explanation of the observed effect is given on the basis of anisotropic polarizabilities and permanent dipole moments of the monomeric constituents. This electric-field-induced effect further enhances the high technological potential of block-copolymer-based soft-lithography applications.« less
  • Three-dimensional hexagonally packed PLLA nanohelices in the PS matrix were formed in the self-assembly of PS-PLLA chiral block copolymer. After hydrolysis of the PLLA blocks, PS with hexagonally packed helical nanochannels can be fabricated and treated as the template for the following sol-gel process. Subsequently, silica precursor mixture was introduced into the PS template by a pore-filling process. Well-defined helical nanocomposites with SiO2 inorganic nanohelices orderly dispersed in polymeric matrix can be successfully obtained after the sol-gel process. As a result, with the combination of the self-assembly of degradable block copolymers and sol-gel chemistry, we suggest a novel method formore » the preparation of the helical nanocomposites with ordered texture.« less