Tuesday publication post 📖 In this newest publication, @Isabel Panicker, Zain Shabeeb, Cory Hargus, and Vida Jamali from #GeorgiaTech used the #PoseidonAX system to investigate how the ionic environment influences the motion of PEG-coated gold nanorods (AuNRs) near liquid–solid interfaces using liquid-phase TEM (#LPTEM).
By systematically varying the surrounding electrolyte (H₂O, H₂SO₄, NaCl, and PBS), the authors reveal how electrostatic screening and ion-specific interactions govern nanoparticle transport at the nanoscale. Combining in situ LPTEM with statistical analysis and deep learning, they identify distinct diffusion mechanisms that emerge under different interfacial conditions.
Key findings:
🔬 Electrostatic screening and specific ion effects directly tune nanoparticle mobility near the SiNx membrane.
🧠 Deep learning analysis distinguishes between fractional Brownian motion (FBM) and annealed transient time motion (ATTM), depending on the ionic environment.
⚡ Strongly interacting systems (H₂O and H₂SO₄) exhibit FBM, while screened environments (NaCl and PBS) transition to ATTM.
📊 A passive nanorheology framework reconstructs the local viscoelastic properties of the liquid–solid interface from nanoparticle trajectories.
💡 Translational and rotational motion serve as nanoscale probes to quantify interfacial mechanics and transport behavior.
This work demonstrates how #PoseidonAX enables nanoparticle dynamics studies in liquid environments, providing new insights into interfacial transport processes that are relevant to catalysis, soft matter, and biological systems.
Want to read the entire work? Find it here!
https://www.doi.org/10.1021/acsnano.6c04149
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