Nanostructurally Controllable Strong Wood Aerogel toward Efficient Thermal Insulation

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http://hdl.handle.net/10138/346553

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Garemark , J , Perea-Buceta , J E , Rico del Cerro , D , Hall , S , Berke , B , Kilpeläinen , I , Berglund , L & Li , Y 2022 , ' Nanostructurally Controllable Strong Wood Aerogel toward Efficient Thermal Insulation ' , ACS Applied Materials & Interfaces , vol. 14 , no. 21 , pp. 24697-24707 . https://doi.org/10.1021/acsami.2c04584

Title: Nanostructurally Controllable Strong Wood Aerogel toward Efficient Thermal Insulation
Author: Garemark, Jonas; Perea-Buceta, Jesus Enrique; Rico del Cerro, Daniel; Hall, Stephen; Berke, Barbara; Kilpeläinen, Ilkka; Berglund, Lars; Li, Yuanyuan
Contributor organization: Department of Chemistry
Helsinki Institute of Sustainability Science (HELSUS)
Synthesis and Analysis
Date: 2022-05-05
Language: eng
Number of pages: 11
Belongs to series: ACS Applied Materials & Interfaces
ISSN: 1944-8244
DOI: https://doi.org/10.1021/acsami.2c04584
URI: http://hdl.handle.net/10138/346553
Abstract: Eco-friendly materials with superior thermal insulation and mechanical properties are desirable for improved energy- and space-efficiency in buildings. Cellulose aerogels with structural anisotropy could fulfill these requirements, but complex processing and high energy demand are challenges for scaling up. Here we propose a scalable, nonadditive, top-down fabrication of strong anisotropic aerogels directly from wood with excellent, near isotropic thermal insulation functions. The aerogel was obtained through cell wall dissolution and controlled precipitation in lumen, using an ionic liquid (IL) mixture comprising DMSO and a guanidinium phosphorus-based IL [MTBD][MMP]. The wood aerogel shows a unique structure with lumen filled with nanofibrils network. In situ formation of a cellulosic nanofibril network in the lumen results in specific surface areas up to 280 m2/g and high yield strengths >1.2 MPa. The highly mesoporous structure (average pore diameter ∼20 nm) of freeze-dried wood aerogels leads to low thermal conductivities in both the radial (0.037 W/mK) and axial (0.057 W/mK) directions, showing great potential as scalable thermal insulators. This synthesis route is energy efficient with high nanostructural controllability. The unique nanostructure and rare combination of strength and thermal properties set the material apart from comparable bottom-up aerogels. This nonadditive synthesis approach is believed to contribute significantly toward large-scale design and structure control of biobased aerogels.
Subject: 116 Chemical sciences
IONIC LIQUIDS
AEROGELS
THERMAL INSULATION
Nanoscience
KEYWORDS
aerogel
wood
ionic liquid
thermal insulation
sustainable materials
NANOFIBRILLATED CELLULOSE
NANOCELLULOSE
FOAMS
CONDUCTIVITY
CHEMISTRY
CHLORIDE
Peer reviewed: Yes
Rights: cc_by
Usage restriction: openAccess
Self-archived version: publishedVersion


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