kth.sePublications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • 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
Charge Regulated Diffusion of Silica Nanoparticles into Wood for Flame Retardant Transparent Wood
KTH, School of Engineering Sciences (SCI), Applied Physics, Photonics.ORCID iD: 0000-0003-3595-5264
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology, Biocomposites. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center.ORCID iD: 0000-0001-8324-485x
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center.ORCID iD: 0000-0002-0185-1224
KTH, School of Engineering Sciences (SCI), Applied Physics, Photonics.ORCID iD: 0000-0002-3627-8085
Show others and affiliations
2022 (English)In: Advanced Sustainable Systems, ISSN 2366-7486, Vol. 6, no 4, p. 2100354-2100354Article in journal (Refereed) Published
Abstract [en]

The preparation of wood substrates modified by charged inorganic nanoparticles (NPs) diffusing into the internal cell wall structure is investigated for generating functional properties. The flammability problem of wood biocomposites is addressed. NPs applied from colloidal sols carry charge to stabilize them against aggregation. The influence of charge on particle diffusion and adsorption should play a role for their spatial distribution and localization in the wood substrate biocomposite. It is hypothesized that improved dispersion, infiltration, and stability of NPs into the wood structure can be achieved by charge control diffusion, also restricting NP agglomeration and limiting distribution to the wood cell wall. Cationic and anionic silica NPs of ≈30 nm are therefore allowed to diffuse into bleached wood. The influence of charge on distribution in wood is investigated as a function of initial sol concentration. Transparent wood is fabricated by in situ polymerization of a thiol­ene in the wood pore space. These biocomposites demonstrate excellent flame retardancy with self­extinguishing characteristics. The approach has potential for commercial fabrication of flame retardant transparent composites for glazing and other building applications.

Place, publisher, year, edition, pages
Wiley , 2022. Vol. 6, no 4, p. 2100354-2100354
National Category
Materials Chemistry
Research subject
Chemical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-312505DOI: 10.1002/adsu.202100354ISI: 000747298100001Scopus ID: 2-s2.0-85123698362OAI: oai:DiVA.org:kth-312505DiVA, id: diva2:1659223
Funder
EU, European Research Council
Note

QC 20220523

Available from: 2022-05-19 Created: 2022-05-19 Last updated: 2022-09-21Bibliographically approved
In thesis
1. Optical Functionalization of Transparent Wood Biocomposites
Open this publication in new window or tab >>Optical Functionalization of Transparent Wood Biocomposites
2022 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Transparent wood (TW) biocomposites combines load-bearing properties with high transmittance of light. TW consists of a reinforcing wood substrate that has been infiltrated with a polymer matrix. TW can be combined with additives so that new multifunctional materials are obtained. Functional additives are, however, sensitive to aggregation and the wood structure limits particle infiltration. Dispersion and distribution of additives as well as optical properties were controlled by chemical treatment of the wood substrate. The structure and chemistry of the wood substrate was influenced by delignification or bleaching.

With a thiol-ene polymer matrix, wood was tailored to produce TW with high or low optical scattering. It was possible to dope a delignified wood substrate with a high content of a fluorescent dye to produce TW solid-state dye lasers. Optical scattering enhanced the spectral brightness of the lasers and wave-guiding in TW partially directed the emission, producing a quasi-random laser.

Favourable distribution of nanoparticles (NPs) was obtained by two routes: in-situ synthesis and charge-regulated NP diffusion. With in-situ synthesis, mobile precursors infiltrated the substrate. With charge-regulated diffusion, cationic NPs were dispersed by negative charges in the wood substrate. Structurally coloured TW with wavelength-specific polarization was produced by in-situ synthesis of plasmonic NPs (PNPs). Utilization of wood compounds as reagents and stabilizing ligands produced TW with well-dispersed PNPs. Flame-retardant and self-extinguishing TW with preserved optical transmittance was prepared by charge-regulated diffusion of cationic silica NPs.

In conclusion, functionalization of wood substrates promoted controlled dispersion of additives for TW with new functionalities, such as laser performance, fluorescence, fire-retardant properties and structural colours.

Abstract [sv]

Transparent trä (TW) är biokompositmaterial som kombinerar lastbärande egenskaper med hög ljustransmittans. TW består av träsubstrat som impregnerats med en polymermatris. Genom att tillsätta additiv till TW kan nya multifunktionella material framställas. Additivens funktioner begränsas dock ofta av aggregation och strukturen i trä begränsar partikelimpregnering. Med kemisk behandling av träsubstratet kan additivens dispersion och distribuering samt optiska egenskaper justeras i TW. Strukturen och kemin i träsubstraten påverkades med delignifiering eller blekning.

 Med en thiol-ene-polymermatris kunde TW med hög eller låg ljusspridning framställas genom att justera träsubstratets kemi. Delignifierat trä kunde dopas med stora mängder fluorescerande färgämnen så att en TW-baserad laser framställdes. I lasern förstärktes emissionen av ljusspridning. Dessutom riktade vågledning i TW emissionen så att lasern inte var slumpartad.

Nanopartiklar (NP) distribuerades i trä genom in-situ syntes eller laddningsreglerad diffusion. Med in-situ syntes kan trä impregneras med mobila reaktanter. Med laddningsreglerad diffusion kan katjoniska NP dispergeras av negativa laddningar i träsubstratet. TW med strukturell färg och våglängdsspecifik polarisering framställdes med in-situ syntes av plasmoniska NP (PNP). Träkomponenter reducerade, dispergerade och stabiliserade PNP. TW med flamskyddande och självsläckande egenskaper och med bevarad ljustransmittans framställdes med laddningsreglerad diffusion av kajoniska silika NP.

Sammanfattningsvis så har biokomopsiter med nya egenskaper framställts genom att bleka eller delignifiera träsubstrat så att dispersionen av additiv förbättrades i TW. TW med laserförmåga, fluorescens, flamskyddande egenskaper och strukturell färg har framställts.

Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2022. p. 60
Series
TRITA-CBH-FOU ; 2022:45
Keywords
transparent wood, biocomposite, optical scattering, interfaces, dye laser, organic dye, plasmonic, nanoparticle
National Category
Materials Chemistry
Identifiers
urn:nbn:se:kth:diva-318395 (URN)978-91-8040-346-7 (ISBN)
Public defence
2022-10-14, F3, Lindstedtsvägen 26, 10:00 (English)
Opponent
Supervisors
Funder
EU, Horizon 2020, grant agreement No. 742733, Wood NanoTechKnut and Alice Wallenberg Foundation, WWSC
Note

QC 2022-09-21

Skolchef Mikael Lindström, CBH, har godkänt embargo.

Available from: 2022-09-21 Created: 2022-09-21 Last updated: 2023-10-13Bibliographically approved

Open Access in DiVA

fulltext(2662 kB)162 downloads
File information
File name FULLTEXT01.pdfFile size 2662 kBChecksum SHA-512
5d3c0c2d2bb3d48e9efed6f458ba3a44e1f22c4e8e146dd2f28e7e3bd04045fb50f800377352be3fbb707a20124ce788b3f231b72f75c39ebf45577cd4e83811
Type fulltextMimetype application/pdf

Other links

Publisher's full textScopus

Authority records

Samanta, ArchanaHöglund, MartinSamanta, PratickPopov, SergeiSychugov, IlyaBerglund, Lars

Search in DiVA

By author/editor
Samanta, ArchanaHöglund, MartinSamanta, PratickPopov, SergeiSychugov, IlyaMaddalena, LorenzaCarosio, FedericoBerglund, Lars
By organisation
PhotonicsBiocompositesWallenberg Wood Science CenterFibre- and Polymer Technology
Materials Chemistry

Search outside of DiVA

GoogleGoogle Scholar
Total: 163 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 276 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • 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