uu.seUppsala University Publications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Influence of the type of oxidant on anion exchange properties of fibrous Cladophora cellulose/polypyrrole composites
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Nanotechnology and Functional Materials. (Nanoteknologi och Funktionella material)
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Nanotechnology and Functional Materials. (Nanoteknologi och Funktionella material)
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Nanotechnology and Functional Materials. (Nanoteknologi och Funktionella material)
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry, Inorganic Chemistry. (oorganisk kemi)
Show others and affiliations
2009 (English)In: Journal of Physical Chemistry B, ISSN 1520-6106, E-ISSN 1520-5207, Vol. 113, no 2, 426-433 p.Article in journal (Refereed) Published
Abstract [en]

The electrochemically controlled anion absorption properties of a novel large surface area composite paper material composed of polypyrrole (PPy) and cellulose derived from Cladophora sp. algae, synthesized with two oxidizing agents, iron(III) chloride and phosphomolybdic acid (PMo), were analyzed in four different electrolytes containing anions (i.e., chloride, aspartate, glutamate, and p-toluenesulfonate) of varying size. The composites were characterized with scanning and transmission electron microscopy, N2 gas adsorption, and conductivity measurements. The potential-controlled ion exchange properties of the materials were studied by cyclic voltammetry and chronoamperometry at varying potentials. The surface area and conductivity of the iron(III) chloride synthesized sample were 58.8 m2/g and 0.65 S/cm, respectively, while the corresponding values for the PMo synthesized sample were 31.3 m2/g and 0.12 S/cm. The number of absorbed ions per sample mass was found to be larger for the iron(III) chloride synthesized sample than for the PMo synthesized one in all four electrolytes. Although the largest extraction yields were obtained in the presence of the smallest anion (i.e., chloride) for both samples, the relative degree of extraction for the largest ions (i.e., glutamate and p-toluenesulfonate) was higher for the PMo sample. This clearly shows that it is possible to increase the extraction yield of large anions by carrying out the PPy polymerization in the presence of large anions. The results likewise show that high ion exchange capacities, as well as extraction and desorption rates, can be obtained for large anions with high surface area composites coated with relatively thin layers of PPy.

Place, publisher, year, edition, pages
2009. Vol. 113, no 2, 426-433 p.
National Category
Chemical Sciences Engineering and Technology
Research subject
Engineering Science with specialization in Nanotechnology and Functional Materials; Inorganic Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-88165DOI: 10.1021/jp806517hISI: 000262324400006PubMedID: 19099422OAI: oai:DiVA.org:uu-88165DiVA: diva2:139413
Available from: 2009-01-22 Created: 2009-01-22 Last updated: 2016-11-30Bibliographically approved
In thesis
1. Development of Cellulose-Based, Nanostructured, Conductive Paper for Biomolecular Extraction and Energy Storage Applications
Open this publication in new window or tab >>Development of Cellulose-Based, Nanostructured, Conductive Paper for Biomolecular Extraction and Energy Storage Applications
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Conductive paper materials consisting of conductive polymers and cellulose are promising for high-tech applications (energy storage and biosciences) due to outstanding aspects of environmental friendliness, mechanical flexibility, electrical conductivity and efficient electroactive behavior. Recently, a conductive composite paper material was developed by covering the individual nanofibers of cellulose from the green algae Cladophora with a polypyrrole (PPy) layer. The PPy-Cladophora cellulose composite paper is featured with high surface area (80 m2 g-1), electronic conductivity (~2 S cm-1), thin conductive layer (~50 nm) and easily up-scalable manufacturing process. This doctoral thesis reports the development of the PPy-Cladophora composite as an electrode material in electrochemically controlled solid phase ion-exchange of biomolecules and all-polymer based energy storage devices. First, electrochemical ion-exchange properties of the PPy-Cladophora cellulose composite were investigated in electrolytes containing three different types of anions, and it was found that smaller anions (nitrate and chloride) are more readily extracted by the composite than lager anions (p-toluene sulfonate). The influence of differently sized oxidants used during polymerization on the anion extraction capacity of the composite was also studied. The composites synthesized with two different oxidizing agents, i.e. iron (III) chloride and phosphomolybdic acid (PMo), were investigated for their ability to extract anions of different sizes. It was established that the number of absorbed ions was larger for the iron (III) chloride-synthesized sample than for the PMo-synthesized sample for all four electrolytes studied. Further, PPy-Cladophora cellulose composites have shown remarkable electrochemically controlled ion extraction capacities when investigated as a solid phase extraction material for batch-wise extraction and release of DNA oligomers. In addition, composite paper was also investigated as an electrode material in the symmetric non-metal based energy storage devices. The salt and paper based energy storage devices exhibited charge capacities (38−50 mAh g−1) with reasonable cycling stability, thereby opening new possibilities for the production of environmentally friendly, cost efficient, up-scalable and lightweight energy storage systems. Finally, micron-sized chopped carbon fibers (CCFs) were incorporated as additives to improve the charge-discharge rates of paper-based energy storage devices and to enhance the DNA release efficiency. The results showed the independent cell capacitances of ~60-70 F g-1 (upto current densities of 99 mA cm2) and also improved the efficiency of DNA release from 25 to 45%.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2011. 65 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 852
Keyword
Polypyrrole, Cladophora cellulose, Conductive paper, Electrochemically controlled ion-exchange, DNA extraction, Paper-based energy storage devices, Chopped Carbon fibers
Research subject
Engineering Science with specialization in Nanotechnology and Functional Materials
Identifiers
urn:nbn:se:uu:diva-158444 (URN)978-91-554-8150-6 (ISBN)
Public defence
2011-10-21, Polhemsalen, Ångström laboratory, Uppsala, 10:15 (English)
Opponent
Supervisors
Available from: 2011-09-30 Created: 2011-09-07 Last updated: 2011-11-03Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full textPubMed

Authority records BETA

Razaq, AamirMihranyan, AlbertWelch, KenStrömme, Maria

Search in DiVA

By author/editor
Razaq, AamirMihranyan, AlbertWelch, KenStrömme, Maria
By organisation
Nanotechnology and Functional MaterialsInorganic Chemistry
In the same journal
Journal of Physical Chemistry B
Chemical SciencesEngineering and Technology

Search outside of DiVA

GoogleGoogle Scholar

doi
pubmed
urn-nbn

Altmetric score

doi
pubmed
urn-nbn
Total: 1342 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf