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Chemical modification of the internal surfaces of cylindrical pores of submicrometer size in poly(ethylene terephthalate)

PETイオン穿孔膜の微細孔内壁への表面化学修飾

前川 康成; 鈴木 康之; 前山 勝也*; 米澤 宣行*; 吉田 勝

Maekawa, Yasunari; Suzuki, Yasuyuki; Maeyama, Katsuya*; Yonezawa, Noriyuki*; Yoshida, Masaru

イオン穿孔膜のナノリアクターやナノ分離膜への応用を目的として、PET膜へのイオンビーム照射により作製したイオン穿孔膜の直径が200$$sim$$800nmの微細孔について、その内壁の化学修飾法による表面特性の制御を試みた。微細孔内壁と同じ構造の膜表面をモデルとして、蛍光色素を有する4-(bromomethyl)-6,7-dimethoxy-coumarin(BrCU)を用いて、膜表面の接触角変化と蛍光強度変化よりアルキル化反応の最適条件を確定した。反応溶液を強制的に導入することで、イオン穿孔膜の微細孔内壁のアルキル化反応を試みた。その蛍光,励起スペクトルともに強度が微細孔内壁の表面積に比例して増加することから、内壁表面のアルキル化反応が進行していることがわかった。さらに、蛍光顕微鏡測定において、イオン穿孔膜の孔径210nmの微細孔に対応した位置から蛍光が観察できたことから、蛍光色素がイオン穿孔膜内に化学固定化できることが確認できた。

Chemical modification of the internal surfaces of cylindrical pores with sub-micrometer of pore diameter in PET film was examined. The modification involved the alkylation of the carboxylic acid on the surfaces with the alkylation reagent containing a fluorescent probe, and it was monitored by observing the change in fluorescent emission intensity. When the DMF solution of 4-(bromomethyl)-6,7-dimethoxycoumarin (BrCU), which bore a coumarin fluorophore, was introduced into the pores, the emission and excitation intensities of the membranes increased proportionally with increases of the pore surface areas. Fluorescent spots of about 300 nm in diameter, which were located at the positions of the pores, can be observed in the fluorescence microscope image of the membranes, indicating that highly concentrated fluorescent probes are chemically incorporated on the internal surfaces of the cylindrical pores with 210 nm in diameter in the membranes. In the reactions of the PET surfaces with BrCU, the fluorescent intensities increased with increases of the contact angles. This result indicates that the hydrophilicity of the internal pore surfaces can be qualitatively modified by controlling the change in the fluorescent intensities.

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パーセンタイル:31.21

分野:Chemistry, Multidisciplinary

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