121st General Meeting of the KCS

Type Poster Presentation
Area Material Chemistry
Room No. Event Hall
Time 4월 20일 (금요일) 11:00~12:30
Code MAT.P-479
Subject A Diatom Based Bio-inspired Nanomaterial for An Efficient Self-Propelled Motor System
Authors Atanu Panda, Minyoung Yoon*, Gyungse Park1, Euisoo Kim, SADA VENKATESWARLU
Department of Nano Chemistry, Gachon University Global Campus, Korea
1Department of Chemistry, Kunsan National University, Korea
Abstract Bio-inspired nanomaterials are of great interest because of their compatibility and and less toxicity to nature. Diatoms have been employed due to not only their unique structure, but also the robust skeleton comprising silica. Moreover, the presence of trace amount of transition metals endows versatile catalytic activity for various conversions. In this work, we are going to present an innovative methodology to used naturally occurring diatom frustules as a self-propelled motor machine after pyrolysis via bubble propulsion by catalytic decomposition of H2O2. For this process, the use of toxic chemicals were avoided, which allows green and eco-friendly methodology for the preparation nanomaterial. This natural motor shows an effective motion in the presence of very low concentration of H2O2 (0.8%) as a fuel. In addition, asymmetric pennate (bilaterally symmetrical) structure can allow unidirectional motion for the motor. The composition analysis of the pyrolyzed diatoms revealed the presence of transition metal elements which can expedite the decomposition of H2O2 fuel. Interestingly, the unidirectional motion breaking was observed by treatment of EDTA (ethylenediaminetetraacetic acid) that can stop the movement by coordination to transition metal elements. The kinetics of the H2O2 decomposition process was determined by conventional titration proved that the decomposition process follows a pseudo first order kinetics. A systematic study of these elemental showed that inherent transition metal element may play a crucial role for the fuel decomposition process. Details of this work will be presented.
E-mail dltks10023@naver.com