Ultrasoft 100 nm thick zero Poisson's ratio film with 60% reversible compressibility.

Ultrasoft 100 nm thick zero Poisson's ratio film with 60% reversible compressibility.
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Ultrasoft 100 nm厚的零泊松比膜具有60%可逆的可压缩性。

DOI:
10.1021/nl300686c
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发表时间:
2012-04-11
期刊:
影响因子:
10.8
通讯作者:
Saraf RF
Saraf RF
中科院分区:
材料科学1区
文献类型:
--
作者:
Nguyen C;Maheshwari V;Saraf RF

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大约100纳米厚的纳米颗粒单层和聚合物层的多层膜表现为模量低于100 KPa的细胞泡沫。1.25 cm半径的薄膜粘附在刚性表面上,可被可逆压缩至60%应变。考虑到(纳米)细胞结构(类似于软木和甲虫的翅膀)中的局部弯曲,可以解释其模量比其成分低4个数量级以上。由于聚合物骨架的刚性仅在四层单层中增加,复合材料的模量增加了70%以上。压缩面积上的应变分布和模量随厚度的增加的电光图表明,薄膜的泊松比为零。
About a 100 nm thick multilayer film of nanoparticle monolayers and polymer layers is shown to behave like cellular-foam with a modulus below 100 KPa. The 1.25 cm radius film adhered to a rigid surface can be compressed reversibly to 60% strain. The more than four orders of magnitude lower modulus compared to its constituents is explained by considering local bending in the (nano)cellular structure, similar to cork and wings of beetles. As the rigidity of the polymer backbone is increased in just four monolayers the modulus of the composite increases by over 70%. Electro-optical map of the strain distribution over the area of compression and increase in modulus with thickness indicates the films have zero Poisson’s ratio.
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