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Macroscopic alignment of silver nanoparticles in reverse hexagonal liquid crystalline templates

Andersson, M; Alfredsson, Viveka LU ; Kjellin, P and Palmqvist, A E C (2002) In Nano Letters 2(12). p.1403-1407
Abstract
A flexible method of preparing and macroscopically aligning nanoparticles of crystalline silver into millimeter long fibers is presented. The approach utilizes the dual functionality of a reverse hexagonal liquid crystalline template containing a built-in reducing agent facing the aqueous domain. The method is advantageous in that its slow kinetics allows for a thorough introduction of a silver salt into the liquid crystal before the reduction takes place, allowing for an efficient loading of

he template and a retained mesoscopic ordering as evidenced by SAXS. It was confirmed by H-1 NMR that the oxyethylene groups of the amphiphilic polymer reduce the silver ions while being oxidized to aldehydes. The silver nanoparticles are... (More)
A flexible method of preparing and macroscopically aligning nanoparticles of crystalline silver into millimeter long fibers is presented. The approach utilizes the dual functionality of a reverse hexagonal liquid crystalline template containing a built-in reducing agent facing the aqueous domain. The method is advantageous in that its slow kinetics allows for a thorough introduction of a silver salt into the liquid crystal before the reduction takes place, allowing for an efficient loading of

he template and a retained mesoscopic ordering as evidenced by SAXS. It was confirmed by H-1 NMR that the oxyethylene groups of the amphiphilic polymer reduce the silver ions while being oxidized to aldehydes. The silver nanoparticles are uniform in size and in the same size range as the diameter of the aqueous domain of the liquid crystal (3 nm), further supporting that the silver particles form inside the liquid crystal. TEM images confirm the macroscopic alignment of silver nanoparticles into fibrils and the packing of fibrils into millimeter long fibers. The diameter of the fibrils and fibers ranges from 30 nm to several hundreds of micrometers. Electron diffraction analysis of a collection of silver nanoparticles confirms their crystallinity as three diffraction rings could be indexed to the face centered cubic structure of silver. A key to the successful macroscopic alignment of the nanoparticles is that the particles are formed inside the liquid crystal, thus minimizing the need for their diffusion i

to and inside the liquid crystal. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Nano Letters
volume
2
issue
12
pages
1403 - 1407
publisher
The American Chemical Society
external identifiers
  • wos:000179813700015
  • scopus:0346111962
ISSN
1530-6992
DOI
10.1021/nl0256412
language
English
LU publication?
yes
id
fffa5740-f8a4-4879-8836-4861046bfe72 (old id 121902)
date added to LUP
2007-07-10 16:03:24
date last changed
2017-11-19 04:09:47
@article{fffa5740-f8a4-4879-8836-4861046bfe72,
  abstract     = {A flexible method of preparing and macroscopically aligning nanoparticles of crystalline silver into millimeter long fibers is presented. The approach utilizes the dual functionality of a reverse hexagonal liquid crystalline template containing a built-in reducing agent facing the aqueous domain. The method is advantageous in that its slow kinetics allows for a thorough introduction of a silver salt into the liquid crystal before the reduction takes place, allowing for an efficient loading of <br/><br>
he template and a retained mesoscopic ordering as evidenced by SAXS. It was confirmed by H-1 NMR that the oxyethylene groups of the amphiphilic polymer reduce the silver ions while being oxidized to aldehydes. The silver nanoparticles are uniform in size and in the same size range as the diameter of the aqueous domain of the liquid crystal (3 nm), further supporting that the silver particles form inside the liquid crystal. TEM images confirm the macroscopic alignment of silver nanoparticles into fibrils and the packing of fibrils into millimeter long fibers. The diameter of the fibrils and fibers ranges from 30 nm to several hundreds of micrometers. Electron diffraction analysis of a collection of silver nanoparticles confirms their crystallinity as three diffraction rings could be indexed to the face centered cubic structure of silver. A key to the successful macroscopic alignment of the nanoparticles is that the particles are formed inside the liquid crystal, thus minimizing the need for their diffusion i<br/><br>
to and inside the liquid crystal.},
  author       = {Andersson, M and Alfredsson, Viveka and Kjellin, P and Palmqvist, A E C},
  issn         = {1530-6992},
  language     = {eng},
  number       = {12},
  pages        = {1403--1407},
  publisher    = {The American Chemical Society},
  series       = {Nano Letters},
  title        = {Macroscopic alignment of silver nanoparticles in reverse hexagonal liquid crystalline templates},
  url          = {http://dx.doi.org/10.1021/nl0256412},
  volume       = {2},
  year         = {2002},
}