Construction of a concentrated recovery system for environmental pollutants using spontaneous running oil droplets

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K05572
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 34030:Green sustainable chemistry and environmental chemistry-related
• Research Institution: Shizuoka Institute of Science and Technology
• Principal Investigator: NANZAI Ben 静岡理工科大学, 理工学部, 准教授 (20563349)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: アクティブマター / ソノケミストリー / 非線形 / マランゴニ効果 / 非平衡 / ソノルミネッセンス / ソフトマター / イオン液体

Outline of Final Research Achievements

It became clear that high polarity is important for optimizing the solvent used in the spontaneous running oil droplet system. In the near future, we will study a system using an "ionic liquid" as a droplet solvent, which has high polarity and poor solubility in water. In addition, as a study of decomposition of recovered substances, we evaluated the sonochemical reaction fields generated in organic solvents. Based on the sonication for 30 kinds of organic compounds as the target solvents, the intensity of sonoluminescence (SL) released when the cavity is collapsed is determined in addition to the cavitation temperature estimated from the amount of gaseous hydrocarbons produced as decomposition products was measured. It was estimated that the average cavitation temperature became higher as the vapor pressure of the solvent decreased, and a positive correlation was found with the SL intensity.

Free Research Field

界面化学，物理化学，超音波化学

Academic Significance and Societal Importance of the Research Achievements

本研究の自走油滴システムは，生体の自律運動の無生物系モデルとして注目されてきたが，新しい組成の液滴系を検討した報告は殆どなく，今回のような環境汚染物質の回収という実用化に向けた研究は高い新規性を有する。水中に低濃度で存在することから，回収や分解が困難な界面活性剤を，基板上に静電吸着させることで濃縮させ，これを液滴が自発走行しながら回収していくことで，さらに効率的に濃縮できる。液滴は水相溶質が存在する方向に走行し，水相溶質濃度が低下するまで走行し続ける。これは，まるで汚れセンサーを備えた自動掃除ロボットのようであり，溶質濃度の非平衡を利用するため，外力を全く必要としない省エネシステムである。