Pretreatment of cellulose matrix for the generation of one-dimensional nanostructures

Urve Kallavus 1Reet Nisumaa 1Kairi Kriiska 1Kalju Lott 2Katrin Idla 3Marek Strandberg 4

1. Tallinn University of Technology,Centre for Materials Research (TUT), Ehitajate tee 5, Tallinn 19086, Estonia
2. Tallinn University of Technology, Department of Materials Science, (TUT), Ehitajate tee 5, Tallinn 19086, Estonia
3. Tallinn University of Technology (TUT), Ehitajate tee 5, Tallinn 19086, Estonia
4. Tallinn University of Technology, Department of Chemistry (TUT), Ehitajate tee 5, Tallinn 19086, Estonia

Abstract

Recently one-dimensional nanostructures based on different oxides (TiO2, ZnO) prepared through chemical precipitation, thermal evaporation under various cooling down procedures, sol-gel or other processes have been run up [1, 2]. The resulting structures are nanoparticles, nanorods, or nanolinters what are intriguing targets for different applications like semiconductors, photocatalysts etc. In this work a cellulose network as an intermediate framework to orientate producible nanostructures was used to create linter-like nanostructures. Wood cell wall structure has been self-assembled by nature in complex way forming tight fibrilar network and this structure was used as a matrix. The cellulose network plays an important role, nevertheless, after complete forming of nanostructures it must be removed. The surface of unbleached SW pulp fibres is generally rough and the fine cellulose fibril network hidden. Surface layer of detached fibres contains remnants from primary cell wall, compound middle lamella, and is highly folded due to the mass loss during pulping. To open the cellulose fine network treatment with supercritical CO2 was carried out. Depending on the duration and other parameters of this process various etching depths were obtained. Resulting structures were investigated with scanning electron microscope and atomic force microscope. Obtained fibre surfaces have highly porous structures with open network of cellulose fibrilar clusters. The depth of highly porous layer directly depends on the duration of the process. Treated in this way fibres are ready for the following introduction of precursors of one-dimensional nanostructures. Pretreatment with supercritical CO2 manifold enhances surface specific area of lignocellulosic matrix and facilitates higher reaction area.

[1] M.Kh. Aminian, N. Taghavinia et al, Nanotechnology 17 (2006) 520-525.

[2] B.H. Kong, D.C. Kim, H.K. Cho, Physica B (article in press).

Legal notice
  • Legal notice:

    Copyright (c) Pielaszek Research, all rights reserved.
    The above materials, including auxiliary resources, are subject to Publisher's copyright and the Author(s) intellectual rights. Without limiting Author(s) rights under respective Copyright Transfer Agreement, no part of the above documents may be reproduced without the express written permission of Pielaszek Research, the Publisher. Express permission from the Author(s) is required to use the above materials for academic purposes, such as lectures or scientific presentations.
    In every case, proper references including Author(s) name(s) and URL of this webpage: http://science24.com/paper/7876 must be provided.

 

Related papers
  1. High temperature defect equilibrium in ZnS:Cu single crystals
  2. High temperature electrical conductivity in ZnSe:In and in CdSe:In under selenium vapor pressure
  3. Atomic absorption photometry determination of excess Zn in ZnO

Presentation: Poster at E-MRS Fall Meeting 2006, Symposium D, by Urve Kallavus
See On-line Journal of E-MRS Fall Meeting 2006

Submitted: 2006-05-15 13:47
Revised:   2009-06-07 00:44
Google
 
Web science24.com
© 1998-2022 pielaszek research, all rights reserved Powered by the Conference Engine