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Highly Conducting, Strong Nanocomposites Based on Nanocellulose-Assisted Aqueous Dispersions of Single-Wall Carbon Nanotubes
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.ORCID iD: 0000-0001-9088-1064
KTH, School of Chemical Science and Engineering (CHE), Centres, Wallenberg Wood Science Center.ORCID iD: 0000-0003-0298-8553
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Fibre Technology. KTH, School of Chemical Science and Engineering (CHE), Centres, Wallenberg Wood Science Center.
KTH, School of Engineering Sciences (SCI), Mechanics.
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2014 (English)In: ACS Nano, ISSN 1936-0851, E-ISSN 1936-086X, Vol. 8, no 3, p. 2467-2476Article in journal (Refereed) Published
Abstract [en]

It is challenging to obtain high-quality dispersions of single-wall nanotubes (SWNTs) in composite matrix materials, in order to reach the full potential of mechanical and electronic properties. The most widely used matrix materials are polymers, and the route to achieving high quality dispersions of SWNT is mainly chemical functionalization of the SWNT. This leads to increased cost, a loss of strength and lower conductivity. In addition full potential of colloidal self-assembly cannot be fully exploited in a polymer matrix. This may limit the possibilities for assembly of highly ordered structural nanocomposites. Here we show that nanofibrillated cellulose (NFC) can act as an excellent aqueous dispersion agent for as-prepared SWNTs, making possible low-cost exfoliation and purification of SWNTs with dispersion limits exceeding 40 wt %. The NFC:SWNT dispersion may also offer a cheap and sustainable alternative for molecular self-assembly of advanced composites. We demonstrate semitransparent conductive films, aerogels and anisotropic microscale fibers with nanoscale composite structure. The NFC:SWNT nanopaper shows increased strength at 3 wt % SWNT, reaching a modulus of 133 GPa, and a strength of 307 MPa. The anisotropic microfiber composites have maximum conductivities above 200 S cm(-1) and current densities reaching 1400 A cm(-2).

Place, publisher, year, edition, pages
2014. Vol. 8, no 3, p. 2467-2476
Keywords [en]
nanocellulose, nanopaper, carbon nanotubes, dispersions, composites, conductivity, self-assembly
National Category
Other Chemistry Topics
Identifiers
URN: urn:nbn:se:kth:diva-144950DOI: 10.1021/nn4060368ISI: 000333539400059Scopus ID: 2-s2.0-84896929193OAI: oai:DiVA.org:kth-144950DiVA, id: diva2:715448
Funder
Knut and Alice Wallenberg Foundation
Note

QC 20140505

Available from: 2014-05-05 Created: 2014-05-05 Last updated: 2018-02-21Bibliographically approved
In thesis
1. Cellulose–Assisted Dispersion of Carbon Nanotubes: From Colloids to Composites
Open this publication in new window or tab >>Cellulose–Assisted Dispersion of Carbon Nanotubes: From Colloids to Composites
2018 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

It is a challenge to disperse nanoparticles to obtain a nanostructured composite. This thesis aims at providing a new route to fabricate carbon nanotube (CNT) composites and suggests mechanisms for nanocellulose–CNT interactions. This route is based on unmodified CNT dispersed in water with the help of nanocellulose. Chemical functionalization of the CNTs and the addition of surfactants are avoided. Thus, the mechanical and electrical properties of such nanotube composites can be improved.

Cellulose derivatives can disperse and stabilize carbon nanotubes in water. Nanocellulose particles, such as cellulose nanofibrils (CNF), are a new form of cellulose derivatives that are able to disperse and stabilize untreated carbon nanotubes in water. The utilization of the hybrid CNF–CNT dispersions are shown to lead to strong nanostructured composites with high nanotube content and conductivity. The mechanism behind the dispersive action of nanocellulose for nanotubes is explored and studied in detail. The dispersive ability of the nanocellulose leads to improved properties of CNF–CNT composites.

Apart from studies of structure and properties of composite fibers and films, two different functional materials are studied in detail. One is to form conductive patterns on cellulose nanopaper for the stable function of printed electronics in various environmental conditions and during handling. The second is to use a water-soluble cellulosic polymer–nanotube dispersion to fabricate superelastic aerogels without any chemical crosslinking or the addition of another component. This makes the aerogels easily recyclable (redispersible in water) and opens a new route for recyclable superelastic CNT composite aerogels.

Abstract [sv]

Det är en utmaning att dispergera nanopartiklar för nanostrukturerade kompositer. Avhandlingen beskriver en ny väg för att framställa kompositer från kolnanorör (CNT) och föreslår mekanismer för växelverkan mellan CNT och CNF. Den nya vägen baseras sig på dispergering av CNT i vatten med hjälp av CNF. CNT behöver inte modifieras kemiskt eller med ytaktiva ämnen. Mekaniska och elektriska egenskaper hos materialen kan därför förbättras.

Cellulsosaderivat kan dispergera och stabilisera CNT i vatten. Nanocellulosa är en ny typ av derivat, i form av fibriller eller nanokristaller, som kan dispergera och stabilisera icke modifierade CNT i vatten. Dispersioner av CNF-CNT används för att framställa starka nanokompositer med hög CNT-halt och hög elektrisk ledningsförmåga. Dispergerings-mekanismen studeras och förklaras från experimentella data. Den dispergerande förmågan hos CNF leder till förbättrade egenskaper hos CNF-CNT-kompositer.

Struktur-egenskaps relationer för fibrer och filmer rapporteras. Två typer av funktionella material studeras i detalj. Ett av materialen består av ledande mönster av CNF-CNT på substrat av nanocellulosa. Det andra exemplet är superelastiska aerogeler utan kemisk tvärbindning. Aerogelerna kan återvinnas och öppnar möjligheter för superelastiska aerogeler.

Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2018. p. 55
Series
TRITA-CBH-FOU ; 2018:2
Keywords
Nanocelluloses, Carbon nanotubes, Composites, Colloids
National Category
Composite Science and Engineering Paper, Pulp and Fiber Technology Nano Technology
Research subject
Fibre and Polymer Science
Identifiers
urn:nbn:se:kth:diva-223453 (URN)978-91-7729-685-0 (ISBN)
Public defence
2018-03-14, F3, Lindstedtsvägen 26, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20180221

Available from: 2018-02-21 Created: 2018-02-21 Last updated: 2018-03-09Bibliographically approved

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Hamedi, Mahiar M.Wågberg, LarsBerglund, Lars A.

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