Measurement of volume fraction distribution in a drying film by imaging with a digital camera
Measurement of volume fraction distribution in a drying film by imaging with a digital camera
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DOI：
10.1016/j.colsurfa.2022.129263
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发表时间：
2022-05-27
影响因子：
5.2
通讯作者：
Routh, Alexander F.
中科院分区：
文献类型：
--
作者：
Hatakeyama, Kota;Tanaka, Kanji;Routh, Alexander F.
我们提出了一种方法来测量胶体薄膜的体积分数分布的演变过程中，他们的干燥过程中，只使用商业数码相机记录的透射光强度。根据朗伯-比尔定律，可以从透射光强度测量具有一定膜厚度的分散膜的体积分数。通过添加红色染料赋予透明分散体伪吸收能力，并且测量液膜的绿色与蓝色光吸收率的比率。对于任何膜，体积分数增加空间上朝向压实前，在这个区域中的体积分数达到约63.4%。在干燥过程中，膜的液体区域内的体积分数也增加。这些趋势与以前使用其他方法获得的结果相似。该方法中的放大倍率可以通过更换成像设备而容易地改变，并且使用不同的透镜在高放大倍率下观察干燥前沿附近的体积分数分布的变化。该方法基于捕获的摄影图像测量体积分数的二维分布，使得在宏观和微观水平上容易观察由干燥引起的体积分数分布的变化。所提出的方法很可能难以应用于各向异性颗粒或导致显著散射的较大颗粒。
We propose a method to measure the evolution of the volume fraction distribution in colloidal films during their drying process, using only the transmitted light intensity recorded with a commercial digital camera. From the Lambert-Beer law, the volume fraction of a dispersion film with a certain film thickness can be measured from the transmitted light intensity. A pseudo-absorption capacity was imparted to the transparent dispersion by adding a red dye, and the ratio of green to blue light absorbance was measured for the liquid film. For any film, the volume fraction increased spatially towards a compaction front, and the volume fraction in this region reached approximately 63.4%. The volume fraction inside the liquid region of the film also increased during drying. These trends are similar to previous results obtained using other methods. The magnification in this method can be easily changed by replacing the imaging equipment, and changes in volume fraction distribution near the drying front were observed at high magnification using different lenses. This method, based on captured photographic images, measure the two-dimensional distribution of the volume fraction, making it easy to observe changes in the volume fraction distribution caused by drying at both macroscopic and microscopic levels. It is likely that the proposed method will be difficult to apply to anisotropic particles or to larger particles which cause significant scattering.