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Yuedan Wang,이경민,오지홍,김신희,이민규,김홍두 한국고분자학회 2013 Macromolecular Research Vol.21 No.8
We report here the synthesis and dielectric properties of polymetalloxane dielectric materials for organic field-effect transistor applications. The gate insulators were obtained from polymetalloxanes by condensation polymerization of metal chelates and silicic acid. The solution shows an appreciable stability to self-condensation and a good coating quality. A high dielectric constant 6.16-8.27 was obtained for the prepared films. Organic thin film transistors with this gate dielectric were found to exhibit high performances, including carrier mobility as large as 1.77 cm2/Vs, on-off current ratios above 1×104, threshold voltages below -0.13 V, and subthreshold swing as low as 0.1 V/decade. In addition, the operating voltage ranges as low as 5 volts was obtained.
Fabrication of silica/PVA‑co‑PE nanofiber membrane for oil/water separation
Yuanli Chen,Hui Fan,Xinlin Zha,Wenwen Wang,Yi Wu,Yi Xiong,Kun Yan,Yuedan Wang,Dong Wang 한국의류학회 2021 Fashion and Textiles Vol.8 No.1
High efficiency and anti-pollution oil/water separation membrane has been widely explored and researched. There are a large number of hydroxyl groups on the surface of silica, which has good wettability and can be used for oil-water separation membranes. Hydrophilic silica nanostructures with different morphologies were synthesized by changing templates and contents of trimethylbenzene (TMB). Here, silica nanospheres with radical pores, hollow silica nanospheres and worm-like silica nanotubes were separately sprayed on the PVA-co-PE nanofiber membrane (PM). The abundance of hydroxyl groups and porous structures on PM surfaces enabled the absorption of silica nanospheres through hydrogen bonds. Compared with different silica nanostructures, it was found that the silica/PM exhibited excellent super-hydrophilicity in air and underwater “oil-hating” properties. The PM was mass-produced in our lab through meltextrusion- phase-separation technique. Therefore, the obtained membranes not only have excellent underwater superoleophobicity but also have a low-cost production. The prepared silica/PM composites were used to separate n-hexane/water, silicone oil/ water and peanut oil water mixtures via filtration. As a result, they all exhibited efficient separation of oil/water mixture through gravity-driven filtration.