The 239th MANA and the 106th ICYS Joint Seminar
Prof. Osvaldo N. Oliveira Jr. & Dr. Fatin Hajjaj
| Date | December 16, Friday |
| Time | 15:30-16:45 |
| Place | Seminar room #431, 4F, MANA Bldg., NAMIKI Site, NIMS |
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15:30-16:15
e-Science meets Nanotechnology: Information Visualization to Enhance Biosensing Performance
The new paradigm referred to as e-Science, or data-intensive discovery, may bring unprecedented developments in science and technology with the huge amounts of data generated by digital instruments and sensor networks. Many units for sensing and biosensing are now produced with nanomaterials using the layer-by-layer (LbL) or the Langmuir-Blodgett (LB) techniques, for these methods offer control of molecular architectures. In this lecture, concepts of information visualization will be introduced with emphasis on their application in enhancing the sensitivity and selectivity of biosensors. Examples will be shown of multidimensional projection and parallel coordinate techniques, in addition to artificial intelligence methods, to enhance the performance of biosensors.
Speaker
Prof. Osvaldo N. Oliveira Jr., Institute of Physics at Sao Carlos, University of Sao Paulo, Brazil
Chair
Dr. Katsuhiko Ariga, MANA Principal Investigator, NIMS
16:15-16:45
Magnetically Reconfigurable Ionic Liquid Crystals
Responsive soft materials with phase-change capabilities under external stimuli, such as liquid crystals (LCs), are considered the most mature candidates for future nonvolatile data storage and reconfigurable electronics. The growing interest in integration of adaptive LC materials in devices brings about the need to utilize non-invasive stimuli to remotely trigger changes in the materials without induced degradation of the device performance. Among all potential external stimuli, a magnetic field has the benefits of contactless control, instant-nonharmful action, and easy integration into electronic devices, though it has only been used limitedly in manipulating supramolecular LC assemblies due to the complication of the forces that are involved. Magnetic-field-induced molecular switching is most suitable for ionic soft materials that are inconsistent with the application of electric fields. Despite these attractive features of the magnetic stimulus, up to date, there is no experimental evidence for a magnetically induced irreversible massive lattice distortion in LCs. In this seminar, I will demonstrate that the application of an external magnetic field can induce a permanent structural transformation in ionic liquid crystalline material with orthorhombic phase structure. Due to structural features, this orthorhombic phase structure transfers preferentially into a more thermodynamically stable cubic phase structure upon cooling its isotropic melt in the presence of magnetic fields. The transition is irreversible and accompanied by a spectacular change of the material properties that confers a memory effect to the system.
Speaker
Dr. Fatin Hajjaj, ICYS-MANA Researcher, NIMS
Chair
Dr. Kentaro Tashiro, MANA Scientist, NIMS