Micro-Scale Restraint Methodology for Humidity Induced Swelling Investigated by Phase Contrast X-Ray Tomography

Patera, Alessandra; Jefimovs, Konstantins; Rafsanjani, Ahmad; Voisard, Frédéric; Derome, Dominique; Carmeliet, Jan

doi:10.1007/s11340-014-9894-y

Cited by 3 publications

(5 citation statements)

References 16 publications

(27 reference statements)

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“…A buckling mode of axial compressive type is found in a group of cells, which are subjected to restraint along the radial direction. More detail about the buckling effects are discussed in [17,23], reporting high values of non-affine strain (~8%) where buckling occurs. The observed buckling accords well with the typical buckling mode of regular periodic honeycomb structure under radial restrain as reported in [17][18][19][20][21].…”

Section: Discussionmentioning

confidence: 99%

“…More detail about the buckling effects are discussed in [17,23], reporting high values of non-affine strain (~8%) where buckling occurs. The observed buckling accords well with the typical buckling mode of regular periodic honeycomb structure under radial restrain as reported in [17][18][19][20][21]. Indeed, this buckling mode is characteristic for honeycomb structures subjected to axial compressive stresses.…”

Section: Discussionmentioning

confidence: 99%

“…The PMMA cubes were used to restrain the free swelling of the wood samples undergoing relative humidity (RH) changes. (More details can be found in [17]).…”

Section: Study (1)mentioning

confidence: 99%

“…The configurations used at the experimental setups of the synchrotron radiation-based phase-contrast X-ray tomographic micro-and nano-scope are schematized in Table 3 based on the case study listed in the previous paragraph. A description of the experimental setups used in cases 1.a and b is given in [10,17]. Details on the nanoscope setup for the case 2 are provided in this paragraph.…”

Section: Imaging Setupsmentioning

confidence: 99%

“…Such cellular structure features must include anisotropy of cell layer materials, layered structure of the cell wall and geometry of the cell. Two important phenomena, generally occurring in many biological materials, were observed during restrained swelling experiments, i.e., the buckling effect [17] and the shape-memory. Results of shape memory are discussed in this section.…”

Section: Anisotropic Swelling Behaviour Of Earlywood and Latewoodmentioning

confidence: 99%

See 4 more Smart Citations

Micro- and Nano-Scales Three-Dimensional Characterisation of Softwood

Patera

Bonnin

2021

J. Imaging

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Understanding the mechanical response of cellular biological materials to environmental stimuli is of fundamental importance from an engineering perspective in composites. To provide a deep understanding of their behaviour, an exhaustive analytical and experimental protocol is required. Attention is focused on softwood but the approach can be applied to a range of cellular materials. This work presents a new non-invasive multi-scale approach for the investigation of the hygro-mechanical behaviour of softwood. At the TOMCAT beamline of the Paul Scherrer Institute, in Switzerland, the swelling behaviour of softwood was probed at the cellular and sub-cellular scales by means of 3D high-resolution phase-contrast X-ray imaging. At the cellular scale, new findings in the anisotropic and reversible swelling behaviour of softwood and in the origin of swelling hysteresis of porous materials are explained from a mechanical perspective. However, the mechanical and moisture properties of wood highly depend on sub-cellular features of the wood cell wall, such as bordered pits, yielding local deformations during a full hygroscopic loading protocol.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

“…The PMMA cubes were used to restrain the free swelling of the wood samples undergoing relative humidity (RH) changes. (More details can be found in [17]).…”

Section: Study (1)mentioning

confidence: 99%

Section: Imaging Setupsmentioning

confidence: 99%

Section: Anisotropic Swelling Behaviour Of Earlywood and Latewoodmentioning

confidence: 99%

See 3 more Smart Citations

Micro- and Nano-Scales Three-Dimensional Characterisation of Softwood

Patera

Bonnin

2021

J. Imaging

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Review: interaction of water vapour with wood and other hygro-responsive materials

Hill,

Altgen,

Penttilӓ

et al. 2024

J Mater Sci

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The purpose of this review is to report on the state-of-the-art on the interaction of moisture with natural materials and fabricated biomimetic functional materials, with an emphasis upon the hygro-responsive behaviour of wood. The primary objective is to examine how water sorption affects dimensional behaviour and how knowledge of this property in natural plant-based (mainly, but not exclusively wood) materials can be used to inform biomimetic design of moisture-responsive materials and devices. The study examines the literature on natural and bio-inspired materials, concentrating upon sorption kinetics, water migration and location of the sorbed water in the materials and their microstructure and mechanical response of the microstructure and how this affects molecular mobility of the sorbate translating to macrostructural changes. Also included within this review, it is an overview of the main experimental techniques which have been used to investigate the interaction of water with these materials at molecular length scales and how modern techniques can resolve the response of these materials at the cell wall level.

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Evaluating wettability of vessels in poplar by Micro-CT imaging

et al. 2022

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The wettability of wood affects some natural phenomena and applications in industry, such as the ascent of sap in the plant stem, wood drying, and impregnation processes for wood modification. Wettability is generally evaluated by measuring the contact angle using techniques such as the sessile drop method and the Wilhelmy method. However, these methods are not applicable to phenomena at the micro-scale such as liquid transport in hardwood vessels. In this study, micro-CT was used to measure the contact angle of liquid in a single wood vessel directly at the submicron scale. The wettability of a wood vessel was analyzed using contact angles of distilled water and diiodomethane. Conventional contact angles of the wood surface were measured using a fixed drop technique. The average contact angle in a vessel determined by the direct CT observation was significantly smaller than that on the wood surface measured by the sessile drop technique. This discrepancy is attributable to the higher total surface energy of the vessel compared to the free energy of a flat surface. The difference in surface energy is due to different chemical composition distributions in various cell wall layers, roughness and surface topography between the wood surface and vessels, and moisture state.

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Micro-Scale Restraint Methodology for Humidity Induced Swelling Investigated by Phase Contrast X-Ray Tomography

Cited by 3 publications

References 16 publications

Micro- and Nano-Scales Three-Dimensional Characterisation of Softwood

Micro- and Nano-Scales Three-Dimensional Characterisation of Softwood

Review: interaction of water vapour with wood and other hygro-responsive materials

Evaluating wettability of vessels in poplar by Micro-CT imaging

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