Rate-Controlled Washing of Surface-Modified Nanoparticles Using Rationally Designed Supercritical CO2 MediaClick to copy article linkArticle link copied!
- Yasuhiko Orita*Yasuhiko Orita*Email: [email protected]. Tel: + 81 3 5734 3037.Department of Chemical Science and Engineering, Tokyo Institute of Technology, 2-12-1 S1-33, Ookayama, Meguro-ku, Tokyo 152-8550, JapanMore by Yasuhiko Orita
- Kai IkedaKai IkedaDepartment of Chemical Science and Engineering, Tokyo Institute of Technology, 2-12-1 S1-33, Ookayama, Meguro-ku, Tokyo 152-8550, JapanMore by Kai Ikeda
- Aoi MuronosonoAoi MuronosonoDepartment of Chemical Science and Engineering, Tokyo Institute of Technology, 2-12-1 S1-33, Ookayama, Meguro-ku, Tokyo 152-8550, JapanMore by Aoi Muronosono
- Thossaporn WijakmateeThossaporn WijakmateeDepartment of Chemical Science and Engineering, Tokyo Institute of Technology, 2-12-1 S1-33, Ookayama, Meguro-ku, Tokyo 152-8550, JapanMore by Thossaporn Wijakmatee
- Taishi KataokaTaishi KataokaDepartment of Chemical Science and Engineering, Tokyo Institute of Technology, 2-12-1 S1-33, Ookayama, Meguro-ku, Tokyo 152-8550, JapanMore by Taishi Kataoka
- Yusuke ShimoyamaYusuke ShimoyamaDepartment of Chemical Science and Engineering, Tokyo Institute of Technology, 2-12-1 S1-33, Ookayama, Meguro-ku, Tokyo 152-8550, JapanMore by Yusuke Shimoyama
Abstract
In practical applications of surface-modified nanoparticles (NPs), the washing stage has a number of challenges, such as insufficient washing, long treatment time, and various waste liquors. Cosolvent-enhanced supercritical CO2 (scCO2) is an appealing solvent system for complete, rapid, and eco-friendly washing owing to its high diffusivity and recyclability. In this paper, we report a rapid washing guideline for surface-modified NPs using ethanol-enhanced scCO2. Kinetic analysis was performed on the washing behavior of oleic acid-modified NPs mixed with various modifiers (C10 to C18 fatty acids) at 40 °C and 20.0 MPa while designing scCO2 media based on rationally estimated modifier solubilities. Notably, the scCO2 medium showed superior washing rates to that of ethanol for various modifiers with a wide range of solubilities in scCO2. The washing rate was dependent on solubility and could be organized into two regions, with a threshold value of 0.016 mol kg–1: solubility/diffusivity-controlled and diffusivity-controlled washing. These findings provide valuable guidelines for designing cosolvent-enhanced scCO2 media for the rapid washing of surface-modified NPs.
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This article is cited by 1 publications.
- Zipeng Yang, Tong Feng, Shihan Wang, Jintao Wu, Dan Zhou, Jianzhong Yin. Mechanism of Adhesion Particle Removal Using Supercritical CO2 and Simulation of Deep Groove Cleaning in Semiconductor. Langmuir 2025, 41
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, 10590-10604. https://doi.org/10.1021/acs.langmuir.5c00687
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