Studies of the Anisotropic Diffusive Motion of Nanoparticles at the Solid-Liquid Interface Using Near-Field Fluorescence Correlation Spectroscopy

• SUZUKI Motohiko

  Graduate School of Science and Technology, Keio University

• KURIHARA Hiroki

  Graduate School of Science and Technology, Keio University

• SAIKI Toshiharu

  Graduate School of Science and Technology, Keio University

抄録

Near-field fluorescence correlation spectroscopy measurements of 20 and 40 nm polystyrene nanoparticles were performed, using fiber probes with aperture diameters ranging from 100 to 250 nm. The experimental data were best fit by a two-dimensional diffusion model, implying that there was significant anisotropy associated with the movement of the particles, such that mobility normal to the wall was much lower than that parallel to the wall. Interestingly, the lateral diffusion coefficients were approximately ten times greater than predicted from the Stokes-Einstein relationship corrected by taking into account hydrodynamic drag forces due to particle-wall interactions. This discrepancy between experimental and theoretical results is possibly due to strong viscous forces as well as attractive forces at the interface.

収録刊行物

• Electrochemistry

  Electrochemistry 82 (5), 376-379, 2014

  公益社団法人　電気化学会

キーワード

• Fluorescence Correlation Spectroscopy
• Near-Field Optical Microscopy
• Brownian Motion
• Hydrodynamic Interaction

詳細情報

• CRID: 1390001206499798784
• NII論文ID: 130004562453
• NII論文ID: 40020051407
• NII書誌ID: AN00151637
• DOI: 10.5796/electrochemistry.82.376
• ISSN: 21862451
• ISSN: 13443542
• NDL書誌ID: 025428632
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I025428632
• Web Site: https://www.jstage.jst.go.jp/article/electrochemistry/82/5/82_13-E00034/_pdf
• 本文言語コード: en
• データソース種別:
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  • NDL
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  • KAKEN
• 抄録ライセンスフラグ: 使用可