Template synthesis of porous fibers by using unidirectional freezing and development of structure-control method

2016 Fiscal Year Final Research Report

• Project/Area Number: 26289287
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Properties in chemical engineering process/Transfer operation/Unit operation
• Research Institution: Kyoto University
• Principal Investigator: Tamon Hajime 京都大学, 工学(系)研究科(研究院), 教授 (30111933)
• Co-Investigator(Kenkyū-buntansha): 鈴木 哲夫 京都大学, 工学(系)研究科(研究院), 助教 (50243043) ; 佐野 紀彰 京都大学, 工学(系)研究科(研究院), 准教授 (70295749)
• Co-Investigator(Renkei-kenkyūsha): SANO Noriaki 京都大学, 大学院工学研究科, 准教授 (70295749)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 一方向凍結 / 多孔質繊維 / テンプレート合成 / ゾルーゲル法 / 多孔構造制御

Outline of Final Research Achievements

Titania cryogel fibers and titania-silica cryogel fibers with various titania contents were synthesized　by　using　unidirectional　freezing. Since the fibers prepared had higher BET surface areas and larger mesopore volumes than those of a commercial photocatalyst, P-25, they showed higher photocatalytic activity towards the decomposition of large organic molecules than P-25. Hollow fibers of MFI type zeolite with high crystallinity were also synthesized by unidirectional freezing and steam-assisted crystallization. Their degree of crystallinity and crystal size could be independently controlled by the concentration of structure-directed agency, the crystallization temperature and the crystallization time.
Next, fibrous sintered bodies of alumina were synthesized by using organic gels prepared from phenol and formaldehyde as a binder. Their morphology and porous structure could be controlled by the conditions of unidirectional freezing and the application of ultrasonic wave to gels.

Free Research Field

分離工学