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首页> 外文会议>TAPPI International Conference on Nanotechnology 2006 >AFM Observations of Dimensional Changes in Individual Cellulose Aggregate Fibrils under Variable Humidity Environments
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AFM Observations of Dimensional Changes in Individual Cellulose Aggregate Fibrils under Variable Humidity Environments

机译：可变湿度环境下单个纤维素聚集体原纤维尺寸变化的AFM观察

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摘要

An algorithm was developed to rapidly analyze the height, width, and area of line scan data of step-shaped disconitunities acquired from atomic force microscope images. The effect of a number of AFM parameters (scan rate, dampening, and tip shape) on the quantitiative imaging of step features was discussed. The AFM scan rate and dampening were found to significantly affect the measured dimensions of step discontinunities. A geometric convolution of the step and the tip was shown to introduce an artifact in the images. Quantitiative imaging using AFM was shown to be very reporducible as five successive scans of a standard step height grating produced less than 3 % variation in all measured parameters. A cellulose aggregate fibril (CAF) was also scanned under varying relative humdity conditions. 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 found to be negatively correlated with the relative humdity, such that as the relative humidity increases the CAF becomes shorter. This finding has significant implications in paper dimensional stability and the application of cellulose micro and nano-fiber composites.
机译：开发了一种算法，可以快速分析从原子力显微镜图像获取的阶梯状不连续性的线扫描数据的高度，宽度和面积。讨论了许多AFM参数（扫描速率，阻尼和尖端形状）对阶跃特征定量成像的影响。发现AFM扫描速率和阻尼会显着影响台阶间断点的测量尺寸。示出了台阶和尖端的几何卷积，以在图像中引入伪像。结果表明，使用AFM进行定量成像具有很高的可重复性，因为对标准阶梯高度光栅的五次连续扫描所产生的所有测量参数变化均小于3％。还在变化的相对湿度条件下扫描了纤维素聚集体原纤维（CAF）。 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。发现CAF的长度与相对湿度呈负相关，从而随着相对湿度增加，CAF变得更短。这一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应用具有重要意义。

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