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相关概念视频

Cellulose and Pectic Polysaccharides01:15

Cellulose and Pectic Polysaccharides

Every plant cell has a cell wall that protects the cell, provides structural support, and gives the cell shape. Cellulose, the main structural component of the plant cell wall, makes up over 30% of plant matter. It is the most abundant organic compound on earth.  Cellulose is an unbranched polysaccharide composed of linear chains of glucose molecules linked by β (1→4) glycosidic bonds.
As a cell matures, its cell wall specializes according to its type. For example, the parenchyma cells of...

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基于纤维素的电磁波吸收结构材料的生物灵感梯度设计策略

Zhao-Xiang Liu1, Huai-Bin Yang1, Zi-Meng Han1

  • 1Department of Chemistry, New Cornerstone Science Laboratory, Institute of Biomimetic Materials & Chemistry, Anhui Engineering Laboratory of Biomimetic Materials, Division of Nanomaterials & Chemistry, Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China.

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这项研究引入了一种具有生物灵感梯度结构的新型纤维素纳米纤维 (CNF) 材料. 该材料表现出卓越的机械强度和电磁波吸收 (EMA) 能力,用于先进的应用.

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梯度结构设计的设计方式纤维素纤维素的使用方法电磁波的吸收电磁波的吸收服务绩效服务表现结构材料是结构材料.

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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
  • 复合材料 复合材料 复合材料

背景情况:

  • 纤维素纳米纤维 (CNF) 为先进材料提供了出色的性能.
  • 在基于CNF的材料中,将机械强度与电磁波吸收 (EMA) 等特定功能相结合,仍然是一个重大挑战.

研究的目的:

  • 开发一种基于CNF的结构材料,具有增强的机械性能和电磁波吸收 (EMA) 能力.
  • 通过采用生物启发的梯度结构设计,使用空心磁铁纳米颗粒和酸化修饰的CNF来实现这一目标.

主要方法:

  • 使用空心磁石纳米颗粒和酸化修饰的CNF制造渐变结构材料.
  • 机械性能的表征,包括屈曲强度.
  • 评估电磁波吸收 (EMA) 性能,包括反射损失和有效吸收带宽.
  • 评估热性质,例如热膨胀系数和储存模块稳定性.

主要成果:

  • 梯度设计导致约205MPa的屈曲强度.
  • 该材料实现了高EMA能力,反射损失为-59.5dB.
  • 观察到5.20GHz的广泛有效吸收带宽,这是由于梯度设计改善了阻抗匹配.
  • 在温度变化中证明了低热膨胀系数和稳定的存储模块.

结论:

  • 开发的基于CNF的结构材料通过生物启发的梯度设计成功地将卓越的机械性能与有效的电磁波吸收 (EMA) 结合起来.
  • 该材料优良的机械,热和EMA性能表明,它在隐形技术和电子包装的电磁干扰屏蔽中具有很大的应用潜力.