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Gradient-Delignified Wood as a Sustainable Anisotropic Insulation Material.

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Title: Gradient-Delignified Wood as a Sustainable Anisotropic Insulation Material.
Authors: Chin, Yi Hien1,2 (AUTHOR) salah_eddine.ouldboukhitine@uca.fr, Ouldboukhitine, Salah-Eddine1,2 (AUTHOR), Vial, Christophe1,3 (AUTHOR), Gril, Joseph1,3,4 (AUTHOR), Moutou Pitti, Rostand1,4,5 (AUTHOR), Labonne, Nicolas2,6 (AUTHOR), Biwole, Pascal1,5,6 (AUTHOR) pascal.biwole@humboldt.edu
Source: Energies (19961073). Oct2025, Vol. 18 Issue 20, p5519. 28p.
Subjects: Delignification, Thermal conductivity, Wooden building, Anisotropic crystals, Engineered wood, Sustainable construction, Strength of materials, Insulating materials
Abstract: Sustainable construction requires bio-based insulation materials that achieve low thermal conductivity without compromising mechanical performance. Poplar wood, which is locally abundant in France, serves as an effective carbon sink and represents a promising resource. While recent research has explored bulk wood delignification, the characterization of such modified materials remains insufficient for practical implementation. In this work, we report the development of gradient-delignified poplar wood through partial delignification using alcoholysis and sodium chlorite bleaching. This process produced a hybrid structure with delignified outer layers and a lignified core. Microscopic analyses revealed that lignin removal led to cell wall swelling and the formation of nano-scale pores. Compared to native poplar, the modified material showed lower transverse thermal conductivity (0.057 W·m−1·K−1), higher specific heat capacity (1.4 kJ·K−1·kg−1 at 20 °C), increased hygroscopicity, and reduced longitudinal compressive strength (15.9 MPa). The retention of the lignified core preserved dimensional stability and load-bearing capacity, thereby overcoming the limitations of complete delignification. In contrast to synthetic foams or mineral wools, these findings demonstrate that partial delignification can produce anisotropic wood-based insulation materials that combine thermal efficiency, mechanical stability, and biodegradability. This work highlights the potential of wood modification nanotechnology to reduce the carbon footprint of building materials. [ABSTRACT FROM AUTHOR]
Copyright of Energies (19961073) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Gradient-Delignified Wood as a Sustainable Anisotropic Insulation Material.
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  Data: <searchLink fieldCode="AR" term="%22Chin%2C+Yi+Hien%22">Chin, Yi Hien</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> salah_eddine.ouldboukhitine@uca.fr</i><br /><searchLink fieldCode="AR" term="%22Ouldboukhitine%2C+Salah-Eddine%22">Ouldboukhitine, Salah-Eddine</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Vial%2C+Christophe%22">Vial, Christophe</searchLink><relatesTo>1,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Gril%2C+Joseph%22">Gril, Joseph</searchLink><relatesTo>1,3,4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Moutou+Pitti%2C+Rostand%22">Moutou Pitti, Rostand</searchLink><relatesTo>1,4,5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Labonne%2C+Nicolas%22">Labonne, Nicolas</searchLink><relatesTo>2,6</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Biwole%2C+Pascal%22">Biwole, Pascal</searchLink><relatesTo>1,5,6</relatesTo> (AUTHOR)<i> pascal.biwole@humboldt.edu</i>
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  Data: <searchLink fieldCode="JN" term="%22Energies+%2819961073%29%22">Energies (19961073)</searchLink>. Oct2025, Vol. 18 Issue 20, p5519. 28p.
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  Data: <searchLink fieldCode="DE" term="%22Delignification%22">Delignification</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+conductivity%22">Thermal conductivity</searchLink><br /><searchLink fieldCode="DE" term="%22Wooden+building%22">Wooden building</searchLink><br /><searchLink fieldCode="DE" term="%22Anisotropic+crystals%22">Anisotropic crystals</searchLink><br /><searchLink fieldCode="DE" term="%22Engineered+wood%22">Engineered wood</searchLink><br /><searchLink fieldCode="DE" term="%22Sustainable+construction%22">Sustainable construction</searchLink><br /><searchLink fieldCode="DE" term="%22Strength+of+materials%22">Strength of materials</searchLink><br /><searchLink fieldCode="DE" term="%22Insulating+materials%22">Insulating materials</searchLink>
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  Data: Sustainable construction requires bio-based insulation materials that achieve low thermal conductivity without compromising mechanical performance. Poplar wood, which is locally abundant in France, serves as an effective carbon sink and represents a promising resource. While recent research has explored bulk wood delignification, the characterization of such modified materials remains insufficient for practical implementation. In this work, we report the development of gradient-delignified poplar wood through partial delignification using alcoholysis and sodium chlorite bleaching. This process produced a hybrid structure with delignified outer layers and a lignified core. Microscopic analyses revealed that lignin removal led to cell wall swelling and the formation of nano-scale pores. Compared to native poplar, the modified material showed lower transverse thermal conductivity (0.057 W·m−1·K−1), higher specific heat capacity (1.4 kJ·K−1·kg−1 at 20 °C), increased hygroscopicity, and reduced longitudinal compressive strength (15.9 MPa). The retention of the lignified core preserved dimensional stability and load-bearing capacity, thereby overcoming the limitations of complete delignification. In contrast to synthetic foams or mineral wools, these findings demonstrate that partial delignification can produce anisotropic wood-based insulation materials that combine thermal efficiency, mechanical stability, and biodegradability. This work highlights the potential of wood modification nanotechnology to reduce the carbon footprint of building materials. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
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  Data: <i>Copyright of Energies (19961073) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Text: English
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      – SubjectFull: Delignification
        Type: general
      – SubjectFull: Thermal conductivity
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      – SubjectFull: Wooden building
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      – SubjectFull: Anisotropic crystals
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      – SubjectFull: Engineered wood
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      – SubjectFull: Sustainable construction
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      – SubjectFull: Strength of materials
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      – SubjectFull: Insulating materials
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      – TitleFull: Gradient-Delignified Wood as a Sustainable Anisotropic Insulation Material.
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              Text: Oct2025
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