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相关概念视频

Wood Products01:21

Wood Products

83
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...
83
Introduction to Wood01:19

Introduction to Wood

238
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...
238
Wood Panel Products01:18

Wood Panel Products

73
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...
73
Wood Surfacing01:14

Wood Surfacing

94
Wood surfacing is a critical finishing process designed to smoothen the wood surface, enhance its dimensional accuracy, and make handling safer. This process compensates for potential shrinkage during the seasoning phase by marginally increasing the wood dimensions before surfacing. It also helps correct some distortions that may occur as the wood dries.
The equipment used in the surfacing process is a plane equipped with rotating blades. This tool efficiently smoothens the wood surface and can...
94
Structural Properties and Dimensions of Lumber01:21

Structural Properties and Dimensions of Lumber

97
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...
97
Softwoods and Hardwoods01:28

Softwoods and Hardwoods

168
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,...
168

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相关实验视频

Updated: Jul 9, 2025

Fabrication and Design of Wood-Based High-Performance Composites
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Fabrication and Design of Wood-Based High-Performance Composites

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基于木材的超级黑色.

Bin Zhao1, Xuetong Shi2, Sergei Khakalo3,4

  • 1Department of Bioproducts and Biosystems, School of Chemical Engineering, Aalto University, Espoo, FI-02150, Finland.

Nature communications
|December 5, 2023
PubMed
概括
此摘要是机器生成的。

研究人员从木材中开发出一种新的超黑色材料. 这种可持续的,无金属的材料具有超低的光反射率,性能优于商用灯.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 纳米技术纳米技术
  • 光学是什么?光学是什么?

背景情况:

  • 光线对光学设备的有害影响需要具有接近零光反射率 (超黑) 的材料.
  • 超黑色材料对于推动以光为中心的技术至关重要.
  • 目前的超黑材料通常涉及复杂的制造或微型制造.

研究的目的:

  • 使用自上而下的方法开发一种简单,坚固和可持续的超黑材料.
  • 研究木材脱和碳化作为创造超黑表面的方法.
  • 为了评估与现有技术相比,来自木材的超黑材料的性能.

主要方法:

  • 一个无金属的自上而下的策略,涉及木材脱和高温碳化 (1500°C).
  • 计算方法指导了材料开发过程.
  • 由此产生的材料结构和光学性能的表征,包括在各种冲击角度的反射率.

主要成果:

  • 垂直对齐的碳微纤维阵列 (厚度约100微米) 由在亚波长中切断的细胞形成.
  • 实现了0.36%的超低光反射率,独立于撞击角度.
  • 与商业光阻塞相比,激光束反射率较低.

结论:

  • 一种简单,可持续和坚固的超黑色材料可以用木材制成.
  • 材料的特性是通过脱,素含量,碳化温度和木材密度来合理化.
  • 来自木材的超黑色材料是微型碳纳米管阵列的可行,机械坚固的替代品.