New starch capsules with antistatic, anti-wear and superlubricity properties

Abstract

Adsorption of drug powder is caused by triboelectrification on the surface of starch capsule during filling process. Furthermore, high wear rate and poor water lubricity also hinder the further practical applications of traditional starch capsule. To solve these problems, a glycerol-modified starch capsule with perfect anti-triboelectrification and enhanced lubrication performance was fabricated. Hydrogen bond between glycerol and starch molecules could reduce the bound water content on the capsule surface and thus realizes anti-triboelectrification. By adding glycerol, a three-tier structure composed of starch-glycerol-water is formed through hydrogen bonding on the surface of the starch film, which has been proven to be favorable for lubrication performance. When 5% glycerol is added, the short-circuit current (I_sc) of starch-based triboelectric nanogenerator (TENG) is reduced by 86%, and the wear volume of the starch film is reduced by 89%. Under water lubrication condition, the lubrication performance of the starch-glycerol film can reach the super lubricated level with a friction coefficient of about 0.005. This work provides a new route to obtain modified starch capsules with improved anti-triboelectrification property, reduced wear rate and superlubricity property.

Graphical abstract

Keywords

starch capsules / hydrogen bonds / anti-triboelectrification / anti-wear / superlubricity

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Acknowledgements

Thanks for the financial support of the Program for Taishan Scholars of Shandong Province (No. ts20190965), the National Key Research and Development Program of China (2020YFF0304600), the National Natural Science Foundation of China (Grant No. 51905518), and the Innovation Leading Talents Program of Qingdao (19-3-2-23-zhc) in China.

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