为了证实多孔结构造成的影响，对乙基纤维素原粉以及乙基纤维素微球的漫反射性能做了表征，图即为两种粉体在250~800 nm光谱区域内漫反射图谱。从图中可知，相比于乙基纤维素原粉，乙基纤维素微球具有更好的漫反射性能，即在所述光谱范围内具有更高的反射率。此外，在证实了乙基纤维素微球内部的多孔结构之后，我们可以推断，在较低乙基纤维素含量下所得粉体的壳层内凹结构，可能源于固含量过低导致的内部结构疏松，从而使得表面壳层失去支撑。

In order to confirm the effect of porous structure, the diffuse reflection properties of ethyl cellulose powder and ethyl cellulose microspheres were characterized. The diffuse reflection spectra of the two powders were shown in the spectral region of 250~800 nm.  It can be seen from the figure that, compared with ethyl cellulose raw powder, ethyl cellulose microspheres have better diffuse reflection properties, that is, they have higher reflectance in the spectral range.  In addition, after confirming the porous structure inside the ethylcellulose microspheres, we can infer that the concave structure of the shell of the powder obtained at a low content of ethyl cellulose may be due to the loose internal structure caused by too low solid content, so that the surface shell loses support.