Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • 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
Wood Nanotechnology for Strong, Mesoporous, and Hydrophobic Biocomposites for Selective Separation of Oil/Water Mixtures
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH). (Biocomposites)
2018 (English)In: ACS Nano, ISSN 1936-0851Article in journal (Other (popular science, discussion, etc.)) Published
Abstract [en]

Tremendous efforts have been dedicated to developing effective and eco-friendly approaches for separation of oil–water mixtures. Challenges remain in terms of complex processing, high material cost, low efficiency, and scale-up problems. Inspired by the tubular porosity and hierarchical organization of wood, a strong, mesoporous, and hydrophobic three-dimensional wood structure is created for selective oil/water separation. A delignified wood template with hydrophilic characteristics is obtained by removal of lignin. The delignified wood template is further functionalized by a reactive epoxy–amine system. This wood/epoxy biocomposite reveals hydrophobic/oleophilic functionality and shows oil absorption as high as 15 g/g. The wood/epoxy biocomposite has a compression yield strength and modulus up to 18 and 263 MPa, respectively, at a solid volume fraction of only 12%. This is more than 20 times that of cellulose-based foams/aerogels reconstructed from cellulose nanofibrils. The favorable performance is ascribed to the natural hierarchical honeycomb structure of wood. Oil can be selectively absorbed not only from below but also from above the water surface. High oil/water absorption capacity of both types of wood structures (delignified template and polymer-modified biocomposite) allows for applications in oil/water separation.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2018.
Keywords [en]
composite; delignification; hierarchical; mechanical; wetting; wood modification
National Category
Engineering and Technology
Research subject
Materials Science and Engineering; Fibre and Polymer Science
Identifiers
URN: urn:nbn:se:kth:diva-223437DOI: 10.1021/acsnano.8b00005Scopus ID: 2-s2.0-85044513449OAI: oai:DiVA.org:kth-223437DiVA, id: diva2:1184434
Note

QC 20180221

Available from: 2018-02-21 Created: 2018-02-21 Last updated: 2018-02-21Bibliographically approved
In thesis
1. Wood Nanotechnologies for Transparency, Fire Retardancy and Liquid Separation
Open this publication in new window or tab >>Wood Nanotechnologies for Transparency, Fire Retardancy and Liquid Separation
2018 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In this thesis, wood nanotechnologies for transparent, fire-retardant and hydrophobic/lipophilic wood have been developed. There are two main parts; wood template preparation/processing concepts and materials design using these templates.

In the wood template processing part, highly porous nanostructured wood templates are prepared. Relationships between processes and material structures are studied. Three chemical treatment methods are used. Lignin and/or chromophores are removed from cell wall, so that nanoscale pores are formed in the cell wall. For preparation of transparent wood, a lignin-retaining method improves physical properties of the template. The pore structures are characterized by scanning electron microscopy and gas adsorption measurement of specific surface area. The compositions of the templates are characterized. Compared with native wood, these templates have nanoscale porosity which provides opportunity for new types of wood modification.

In the materials design part, wood nanotechnologies are used for transparent wood as well as for hydrophobic/lipophilic and fire-retardant wood. Two main strategies are used: i) nanoparticles are embedded inside the cell wall; ii) polymers are impregnated in lumen space, and sometimes also inside the cell wall. The transparent wood is prepared by MMA monomer/oligomer impregnation of lumen space. MMA has similar refractive index to the delignified template, so that scattering is reduced and transparent wood with favorable optical and mechanical properties is obtained. The structure and functional properties are studied. Laminated transparent plywood is designed to modify mechanical properties. Transparent wood and transparent plywood are demonstrated in applications combining loading-bearing properties with optical performance such as luminescent properties.

The highly porous wood template cell walls are also impregnated with colloidal montmorillonite clay or epoxy/amine solutions to modify the cell wall and form nanostructured biocomposites. The structure and properties of the two materials are investigated; wood/clay hybrids for flame-retardancy and wood/epoxy biocomposites for oil/water separation.

Place, publisher, year, edition, pages
Stockholm: Royal Institute of Technology, 2018. p. 77
Series
TRITA-CBH-FOU ; 2018:1
National Category
Engineering and Technology
Research subject
Materials Science and Engineering; Fibre and Polymer Science
Identifiers
urn:nbn:se:kth:diva-223441 (URN)978-91-7729-671-3 (ISBN)
Public defence
2018-03-07, F3, Lindstedtsvägen 26, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20180221

Available from: 2018-02-21 Created: 2018-02-21 Last updated: 2018-05-31Bibliographically approved

Open Access in DiVA

No full text in DiVA

Other links

Publisher's full textScopusPublisher

Authority records BETA

Fu, Qiliang

Search in DiVA

By author/editor
Fu, Qiliang
By organisation
School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH)
Engineering and Technology

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 111 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • 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