In this study, we proposed bridged glass nanopillar structures with high scratch resistance. The glass nanopillars were joined each other with bridged structures. The bridged glass nanopillars were fabricated using anisotropic talbot photolithography and reactive ion etching. AFM and FE-SEM analyses showed that the bridged glass nanopillar structures were successfully fabricated by photolithography and dry etching. Scratch resistance of the bridged glass nanopillers improved seven times stronger than that of the nanopillers without bridged structures in friction test using a flannel cloth. Furthermore, bridged glass nanopillars were not collapsed through high stress friction test using a steel wool. Additionally, self-cleaning effect of the bridged glass nanopillars with superhydrophilic behavior were successfully demonstrated by spraying water droplets. We expect that the proposed bridged glass nanopillar structures will be a highly promising technology for self-cleaning glass.

Cell subculture processes, such as medium exchange and cell detachment, are essential steps for maintaining cells healthy during performing experiments. Simplification of subculture processes would benefit cells' viability by reducing the number of steps performed by researchers, consequently minimizing cell stress. In particular, it is considered important to reduce the damage caused by the enzymatic treatment to detach adherent cells. We developed a new subculture device to replace conventional enzymatic treatments with the use of a thermoresponsive substrate in this work. Thermoresponsive substrates were prepared coating poly N-isopropylacrylamide with different concentrations onto glass substrates pre-coated with a silane-coupling agent. Prepared thermoresponsive substrates were evaluated by cell proliferation and detachment tests as well as the measurement of contact angles with respect to different pNIPAAm concentrations. Developed culture device was then evaluated by performing cell subculture, which results in achieving the cell proliferation and detachment rates over 80%. It was confirmed the use of a cartridge-type cell culture device allows faster and easier cell detachment in subculture process. We finally confirmed that the feasibility of developed cell culture device for its potential applications in cell related researches.

We have developed cantilever-based strain sensors which can be used in the pressure measurement of compressed air. The cantilever beam's distortion due to compressed air blowing is detected by strain sensor located at the fixed end of the cantilever. We evaluated the output characteristics, blowing high-pressure N₂ gas to the cantilever sensor. The sensor outputs clearly depended on the N₂ gas pressure, the distance between the sensor and the nozzle, and N₂ gas blowing position. As a result, we confirmed that our sensors can be applied to the pressure measurement of the compressed air.

Amorphous indium-gallium-zinc oxide thin-film transistor based pH sensors utilizing a top-gate effect exhibit a high pH sensitivity beyond the Nernst theoretical limit. In this paper, we optimize the sequence for operating these sensors, and evaluate gate-to-source voltage (V_gs) response to small pH step variations. An intermittent operation obviously suppresses the long-term drift. As a result, the a-InGaZnO TFT pH sensor with the sensitivity of 450 mV/pH shows linear V_gs response to a pH step change of 0.1.