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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing >Technique for the measurement of dimensional changes of natural microfibril materials under variable humidity environments
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Technique for the measurement of dimensional changes of natural microfibril materials under variable humidity environments

机译：可变湿度环境下天然微纤维材料尺寸变化的测量技术

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An algorithm was developed to analyze the dimensions of line scan data of step-shaped disconitunities acquired with an atomic force microscope. The effect of a number of AFM parameters on the quantitative imaging of step features was discussed. Quantitiative imaging using AFM was shown to be very reproducible as five successive scans of a standard step height grating produced less than 3% variation in measured parameters. A cellulose microfibril, called cellulose aggregate fibril (CAF), with dimensions of ～50,000 nm x 2000 nm x 300 nm derived from papermaking fibers was scanned under cyclic relative humdity conditions with the relative humidity starting at 50% then raising to 80% followed by a decrease in the relative humidity to 28%. Changes in the width of the CAF were weakly correlated with changes in the relative humdity, while changes in the height and area of the CAF were positively correlated with the relative humdity. The length of the CAF was negatively correlated with the given relative humdity cycle. These findings have significant implications in paper dimensional stability and the engineering of cellulose micro and nano-fiber composites.
机译：开发了一种算法来分析原子力显微镜获得的阶梯状不连续性的线扫描数据的尺寸。讨论了许多AFM参数对阶跃特征定量成像的影响。结果表明，使用AFM进行定量成像具有很好的重现性，因为对标准阶跃高度光栅的五次连续扫描所产生的测量参数变化小于3％。在循环相对湿度条件下扫描一种由造纸纤维衍生的尺寸为〜50,000 nm x 2000 nm x 300 nm的纤维素微纤维，称为纤维素聚集纤维（CAF），相对湿度从50％开始，然后升至80％，然后相对湿度降低到28％。 CAF宽度的变化与相对湿度的变化呈弱相关，而CAF高度和面积的变化与相对湿度的变化呈正相关。 CAF的长度与给定的相对湿度周期呈负相关。这些发现对纸的尺寸稳定性以及纤维素微纤维和纳米纤维复合材料的工程意义重大。

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