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首页> 外文期刊>Textile Research Journal >Internal Structure of Mature and Immature Cotton Fibers Revealed by Scanning Probe Microscopy
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Internal Structure of Mature and Immature Cotton Fibers Revealed by Scanning Probe Microscopy

机译：扫描探针显微镜揭示成熟和未成熟棉纤维的内部结构

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A scanning probe microscope (SPM) is used to investigate morphological, nano-me-chanical, and moisture absorption properties of transverse sections of mature and immature cotton fibers. Using TappingMode~(TM), images of whole sections reveal growth bands and the lumen. Increasing the imaging force produces contrast in the phase images, revealing discrete fibrils and variations in fibril density across the fiber cross sections. The effect of relative humidity (RH) on the fiber structure and hardness is also examined with the SPM. As RH increases, immature fibers swell above the face of the resin block in which they are mounted and become "softer," as indicated by a series of force-distance measurements. What is thought to be fibril aggregation is evident when the immature fibers dry. Mature fibers in the resin block also "soften" to some degree but fail to swell, and fibril aggregation is not evident. Transverse sections of both mature and immature fibers, which have been cut from the resin block and floated in water onto glass microscope slides, show fibril aggregation. Both the mature and immature fibers are believed to pass through a glass transition at about 78% RH at 22℃. To our knowledge, this is the first study to reveal the fine structure of cotton fiber cross sections that have not received chemical or physical pretreatment. Proposed future work will attempt to relate both fibril density and hardness to the degree of crystallinity and, in turn, fiber maturity. In addition, the ability to obtain images of the growth bands that have been unaltered since the initial drying of the fiber may be useful in studying growing conditions.
机译：扫描探针显微镜（SPM）用于研究成熟和不成熟棉纤维横截面的形态，纳米机械和吸湿性能。使用TappingMode〜（TM），整个切片的图像显示出生长带和管腔。增大成像力会在相图像中产生对比度，从而显示出离散的原纤维以及整个纤维横截面的原纤维密度变化。 SPM还检查了相对湿度（RH）对纤维结构和硬度的影响。随着RH的增加，未成熟的纤维会在树脂块的安装面上方膨胀，并且变得“更柔软”，如一系列力距离测量所表明的。当未成熟的纤维干燥时，被认为是原纤维聚集。树脂嵌段中的成熟纤维也会“软化”到一定程度，但不会溶胀，并且原纤维聚集不明显。从树脂块上切下并漂浮在水中的成熟和未成熟纤维的横截面都在玻璃显微镜载玻片上，显示出原纤维聚集。据信，成熟纤维和未成熟纤维均在22℃下在约78％RH下通过玻璃化转变。据我们所知，这是第一项揭示未经化学或物理预处理的棉纤维横截面的精细结构的研究。拟议的未来工作将尝试将原纤维密度和硬度与结晶度以及纤维成熟度联系起来。另外，获得自纤维初次干燥以来未改变的生长带图像的能力可能对研究生长条件有用。

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