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Related Concept Videos

Wood Products01:21

Wood Products

346
Wood products encompass a broad range of materials crafted from wood strands, veneers, lumber, and even waste wood-like shreds, designed for both structural and nonstructural purposes. Various specialized wood products have been developed to enhance strength, durability, and versatility in building applications.
Glue-laminated wood, often referred to as glulam, combines multiple smaller pieces of dimensional lumber using adhesives to form a single, larger piece. Cross-laminated timber consists...
346
Introduction to Wood01:19

Introduction to Wood

923
Wood, derived from trees, is a versatile and widely used construction material. Trees feature a trunk surrounded by a protective layer of dead bark. Beneath this outer layer lies the living bark, followed by the cambium, and then the sapwood which transitions into heartwood as it matures. At the center of the trunk is the pith. The age of a tree can be discerned by examining its growth rings, which are concentric bands visible in the trunk's cross-section.
The structural integrity of the...
923
Lumber01:19

Lumber

437
Lumber is derived from logs which are harvested, debarked, and processed into long pieces with a rectangular cross-section. The transformation of logs into lumber involves multiple steps, beginning with an automated saw that slices the log into slabs. These slabs are then transported via a conveyor belt to smaller saws, where they are cut into square-edged pieces of specific widths.
Initially, the surfaces of these lumber pieces are rough, and their dimensions may vary slightly from one end to...
437
Wood Panel Products01:18

Wood Panel Products

424
Wood panel products are essential materials used in construction for applications such as flooring, siding, and roofing, typically available in standard dimensions of 4 feet by 8 feet, with thicknesses varying from one-quarter of an inch to one and one-eighth inches. Among the most common types of wood panels is plywood, which is produced by gluing multiple layers of thin wood veneers under pressure. The grain of the outer veneers runs lengthwise, while the grains of the interior layers run...
424
Structural Properties and Dimensions of Lumber01:21

Structural Properties and Dimensions of Lumber

434
Wood's structural properties derive from fibers aligned along the tree's length, contributing significantly to its mechanical strength. Wood exhibits up to twenty times greater tensile strength along these fibers compared to across them, and generally shows better performance under compression than tension. The length of fibers varies, with hardwoods having fibers around one twenty-fifth inch long and softwoods ranging from one-eighth to one-third inch.
The strength characteristics of...
434
Softwoods and Hardwoods01:28

Softwoods and Hardwoods

628
Softwoods and hardwoods, derived from different types of trees, are distinguished by their leaf structures and cellular compositions, each serving unique purposes in construction and manufacturing. Softwoods come from cone-bearing trees with needle-like leaves and are predominantly composed of longitudinal cells called tracheids and a smaller proportion of radial cells known as rays. Due to their cellular structure, softwoods are commonly used in construction for structural frames, sheathing,...
628

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Towards Biomimicking Wood: Fabricated Free-standing Films of Nanocellulose, Lignin, and a Synthetic Polycation
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Lignin-Retaining Transparent Wood.

Yuanyuan Li1, Qiliang Fu1, Ramiro Rojas1

  • 1Department of Fibre and Polymer Technology, Wallenberg Wood Science Center, Chemical Science and Engineering Institution, KTH Royal Institute of Technology, Teknikringen 56-58, Stockholm, Sweden.

Chemsuschem
|July 19, 2017
PubMed
Summary
This summary is machine-generated.

A new green method preserves up to 80% lignin in transparent wood, enhancing its strength and enabling energy-efficient building materials. This approach overcomes limitations of traditional delignification processes.

Keywords:
building materialsdelignificationenergy savingligninwood

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Area of Science:

  • Materials Science
  • Sustainable Building Materials

Background:

  • Optically transparent wood is an emerging material for energy-efficient buildings.
  • Traditional fabrication involves extensive delignification, which is time-consuming, environmentally unfriendly, and weakens the wood structure.

Purpose of the Study:

  • To develop a green and industrially feasible method for preparing transparent wood.
  • To overcome the limitations of traditional delignification processes.

Main Methods:

  • Developed a novel method preserving up to 80% of lignin.
  • Utilized polymer infiltration on the high-lignin wood template.

Main Results:

  • Achieved a high-lignin transparent wood with 83% transmittance and 75% haze.
  • Obtained a work-to-fracture 1.2 MJ/m³ (significantly higher than glass).
  • Demonstrated a thermal conductivity of 0.23 W/(m·K).

Conclusions:

  • The developed method is efficient, environmentally benign, and applicable to various wood species.
  • The resulting high-lignin transparent wood offers superior mechanical strength and potential for energy-saving building applications.