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Related Experiment Video

Updated: Jun 24, 2025

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Deciphering the Dynamic Assembling-Disassembling of Small Molecules on Solid/Liquid Interfaces within Microchannels

Lei Zhao1,2, Yuting Qiao3, Jing Wu1

  • 1State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province, Department of Chemistry, Lanzhou University, Lanzhou, Gansu 730000, P. R. China.

Analytical Chemistry
|June 12, 2024
PubMed
Summary

Researchers developed a pulsed streaming potential (SP) method to monitor small molecule surfactant assembly on microchannel surfaces in real-time. This technique differentiates five kinetic regimes and reveals differences based on surfactant structure and concentration.

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Area of Science:

  • Surface Chemistry
  • Physical Chemistry
  • Materials Science

Background:

  • Small molecule assembly at liquid/solid interfaces creates unique properties.
  • Dynamic assembly processes are challenging to evaluate accurately due to concentration and material variations.

Purpose of the Study:

  • To develop a method for in situ and real-time monitoring of small-molecule surfactant assembly/disassembly on microchannel surfaces.
  • To differentiate kinetic regimes and understand molecular behavior during assembly cycles.

Main Methods:

  • Utilized pulsed streaming potential (SP) measurement, which detects surface charge variations.
  • Investigated small-molecule surfactants with varying hydrophobic tail lengths (e.g., C16TAB/C18TAB, D10DAB/D12DAB).
  • Analyzed dynamic characterization of assembly/disassembly consequences.

Main Results:

  • Identified five distinct kinetic regimes during assembly-disassembly cycles.
  • Observed significant differences in assembly processes for surfactants differing by only two -CH2- units in their hydrophobic tails.
  • Found a positive correlation between relative SP (Er) and molecular weight at 0.1 mM concentration.
  • Detected an "overshoot effect" in D10DAB kinetics at high concentrations, indicating morphology adjustment.

Conclusions:

  • Pulsed SP measurement provides a convenient tool for real-time monitoring of dynamic solid/liquid interfaces.
  • The method effectively differentiates surfactant behavior based on molecular structure and concentration.
  • Demonstrated the impact of molecular assembly/disassembly on applications like electrophoretic separation, protein immobilization, and photocatalysis.