Strong, Shape-Memory Aerogel via Wood Cell Wall Nanoscale Reassembly

QC 20230515
Polymer shape-memory aerogels (PSMAs) are prospects in various fields of application ranging from aerospace to biomedicine, as advanced thermal insulators, actuators, or sensors. However, the fabrication of PSMAs with good mechanical performance is challenging and is currently dominated by fossil-based polymers. In this work, strong, shape-memory bio-aerogels with high specific surface areas (up to 220 m2/g) and low radial thermal conductivity (0.042 W/mK) were prepared through a one-step treatment of native wood using an ionic liquid mixture of [MTBD]+[MMP]−/DMSO. The aerogel showed similar chemical composition similar to native wood. Nanoscale spatial rearrangement of wood biopolymers in the cell wall and lumen was achieved, resulting in flexible hydrogels, offering design freedom for subsequent aerogels with intricate geometries. Shape-memory function under stimuli of water was reported. The chemical composition and distribution, morphology, and mechanical performance of the aerogel were carefully studied using confocal Raman spectroscopy, AFM, SAXS/WAXS, NMR, digital image correlation, etc. With its simplicity, sustainability, and the broad range of applicability, the methodology developed for nanoscale reassembly of wood is an advancement for the design of biobased shape-memory aerogels.

Perea-Buceta, Jesus E.Materials Chemistry Division, Department of Chemistry, Faculty of Science, University of Helsinki, 00560 Helsinki, Finland (author)
Felhofer, MartinDepartment of Nanobiotechnology, Institute of Biophysics, University of Natural Resources and Life Sciences, Vienna, Austria (author)
Chen, BinKTH,Biokompositer,Wallenberg Wood Science Center(Swepub:kth)u1sqe20o (author)
Cortes Ruiz, Maria F.KTH,Fiber- och polymerteknologi,Wallenberg Wood Science Center(Swepub:kth)u18mffb4 (author)
Sapouna, IoannaKTH,Glykovetenskap,Wallenberg Wood Science Center(Swepub:kth)u1415z0f (author)
Gierlinger, NotburgaDepartment of Nanobiotechnology, Institute of Biophysics, University of Natural Resources and Life Sciences, Vienna, Austria (author)
Kilpeläinen, IlkkaMaterials Chemistry Division, Department of Chemistry, Faculty of Science, University of Helsinki, 00560Helsinki, Finland. (author)
Berglund, Lars,1956-KTH,Biokompositer,Wallenberg Wood Science Center(Swepub:kth)u1wqz3r1 (author)
Li, YuanyuanKTH,Wallenberg Wood Science Center,Biokompositer(Swepub:kth)u1bpdtr4 (author)
KTHBiokompositer (creator_code:org_t)

In:ACS Nano: American Chemical Society (ACS)17:5, s. 4775-47891936-08511936-086X

By the author/editor: Garemark, Jonas; Perea-Buceta, Je ...; Felhofer, Martin; Chen, Bin; Cortes Ruiz, Mar ...; Sapouna, Ioanna; show more...; Gierlinger, Notb ...; Kilpeläinen, Ilk ...; Berglund, Lars, ...; Li, Yuanyuan; show less...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Chemical Science ...; and Materials Chemis ...

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