| 초록 |
Diatom has been employed in various terms of material sciences, mainly owing to its distinctive silica frustule made up of hierarchical micro/nano structure. However, the surface chemistry of diatom silica has not been explored deeply. Negative charge of diatom silica, originated from biosynthetic procedure assisted with positively modified proteins post translation, could result in apparent movement under electric field. Thus, we employed various electric fields with dried state and oil-wetted condition of diatom silica to identify electrostatic behavior coming from its surficial negativity. As a result, we could confirm that biosilica has a lot more surficial negativity than chemical one, becoming electrorheological fluid due to affinity to positive surface. From this perspective, diatom silica has enormous potential to take advantages of electrostatic behavior through negatively charged surface from nature as triboelectric nanogenerator, microactuator, and microrobotics. |
