旭硝子財団助成研究成果報告2022

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99Sontipee AIMMANEE100Isa ANSHORIStable Transition of Bistable Composite Plates(Project 2021)Electrochemical Sensor Development based on Bipyramid Gold Nanoparticle for Label-Free Dopamine Detection(Project 2021)72旭硝子財団　助成研究成果報告（2022）Otter (AScO) and Smooth-coated Otter (ScO) encounter several threats including kept as pet, meat hunting, human persecution, dog-bite and road-kill. Among these threats, kept as pet is the main threat reducing wild otter populations especially for AScO. Approximately 20% of the surveyed sub-districts are identified as having high and very high threats to otters with Phang-nga as the province with the highest number. Only 9% of surveyed grids that both have high otter occupancy and threat, and thus require urgent conservation action. Future study should also include habitat loss/alteration as another threat and extend study coverage to another side of southern Thailand.A novel mathematical model for predicting adaptive behaviors of composite cross-ply laminated carbon-fiber reinforced plates is demonstrated in this report. Uniform and nonuniform curvature of the deformed plate configuration are postulated in the Lagrangian and Hamiltonian formulations to capture the effect of geometrical nonlinearities on shape morphing. Strong nonlinear curvature-temperature relationships are accurately predicted in the cases of square and rectangular plates. The model is validated with commercialized finite element software ABAQUS and the results obtained from both approaches are in excellent agreement. The purposed model can be readily extended to combine the effects of piezoelectric actuation with thermoelastic response on the morphing behaviors. The model is also advantageous to construct a stability diagram of the cross-ply laminated plates integrated with piezoceramic actuators at the room temperature. Finally, this study establishes a thorough physical understanding of multi-stability behaviors of smart composite plates for applications in various areas of shape control in thin-walled structures.Dopamine is one of the essential neurotransmitters because of its role in various central nervous systems. Monitoring dopamine levels in the body is necessary for early diagnosis because the dopamine system dysfunction will signify various nervous system diseases or cardiotoxicity. Electrochemical sensor technology has become one of the areas for developing routine health monitoring, which can be alternative other than conventional analysis. To support the purpose of the PoC sensor, electrochemical data collection using a screen-printed carbon electrode (SPCE) was developed. Various modifications to the electrode surface were carried out to enhance the performance. Bipyramid-shaped gold nanoparticles (AuNB) will be one of the promising candidates because they have sharp angles that will make a more significant contribution because the electromagnetic field generated at the angle of the nanoparticles increases. Therefore, in this study, modification of SPCE with AuNB was carried out. After testing as a dopamine sensor detector with the chronoamperometric method, the correlation coefficient value (R2) is 0.9974 in the range of 0.1-100 μM, and LOD is 0.037 µM. The sensor can detect dopamine, ascorbic acid (AA), uric acid (UA), and urea at different potential peaks, which has good selectivity. In addition, the reproducibility of this sensor was also tested and had an average error of 1.9% from 5 different SPCEs. These results indicate that SPCE modified with AuNB can be used as a sensor for dopamine detection.