Single‐Particle Diffusion at the Vertical Silicone Oil‐Water Interface

ChemistrySelect, Journal Year: 2025, Volume and Issue: 10(16)

Published: April 1, 2025

Abstract This paper reports single‐particle tracking (SPT) measurements of the lateral mass transport behaviors individual fluorescent particles at a vertical silicone oil‐water interface. By loading each half polydimethylsiloxane‐based microfluidic channel with oil (viscosity: 20 – 200 mPas) and particle‐doped water side‐by‐side, liquid‐liquid interface was formed. Carboxylated polystyrene microspheres (diameter: nm) were used as to simultaneously probe complex nanoparticle characteristics liquid in adjacent water/oil phases. A wealth different types observed quantitatively assessed, including interfacial adsorption desorption, hindered Brownian motions, partitioning dynamics particle between immiscible liquids. The fluid also allowed for single be followed over extended time length scales, revealing its transitional behavior from one mode other. Interestingly, bending by particle's diffusive motion has offered an intriguing means investigate correlate single‐particle's capillary forces characteristics. usefulness power SPT methods offering advanced characterization interface's nanoscale properties have been thoroughly demonstrated this work.

Language: Английский

Structures of Liquid–Liquid Interfaces in Partially Miscible Systems Revealed by Soft X-ray Imaging

The Journal of Physical Chemistry Letters, Journal Year: 2024, Volume and Issue: 15(32), P. 8265 - 8271

Published: Aug. 6, 2024

The properties of liquid-liquid interfaces are intricately linked to its structure, with a particular focus on the concentration distribution within interface. To obtain precise information regarding distribution, we have developed high-resolution soft X-ray imaging method for interfaces. This work focused representative partially miscible systems, analyzing interfacial profiles water-alkanols under both steady-state and dynamic processes, obtaining diffusion coefficients different water concentrations in alkanols. Significant disparities distributions concentration-related were observed despite comparable distances same system across states. Meanwhile, it was found that alkanols exhibit adsorption phenomena at newfound knowledge serves as crucial stepping stone toward deeper understanding systems. Our study opens way explore interface high-resolution.

Language: Английский