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Related Concept Videos

Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model01:09

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Various dissolution theories provide insight into the factors that influence the dissolution rate. Danckwerts' Model suggests that turbulence, rather than a stagnant layer, characterizes the dissolution medium at the solid-liquid interface. In this model, the agitated solvent contains macroscopic packets that move to the interface via eddy currents, facilitating the absorption and delivery of the drug to the bulk solution. The regular replenishment of solvent packets maintains the...
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Related Experiment Video

Updated: Nov 20, 2025

Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
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Order-Determined Structural and Energy Transport Dynamics in Solid-Supported Interfacial Methanol.

Xing He1, Ding-Shyue Yang1

  • 1Department of Chemistry, University of Houston, Houston, Texas 77204, United States.

Nano Letters
|January 21, 2021
PubMed
Summary

Energy transport differs in methanol assemblies based on structural order. Thermal diffusion occurs in 2D films, while 3D crystalline solids exhibit faster ballistic energy transport.

Keywords:
Debye−Wallercooperative molecular motionsheat conductioninterfacial energy transferscattering of cross-plane phonons

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Area of Science:

  • Nanoscale science
  • Materials science
  • Physical chemistry

Background:

  • Energy transport dynamics in nanostructures are key for nanoscale heat management.
  • Stacking disorder can significantly impact thermal conductivity in layered materials.

Purpose of the Study:

  • Investigate energy transport differences in solid-supported methanol assemblies.
  • Examine the influence of stacking order on energy transport mechanisms.

Main Methods:

  • Ultrafast electron diffraction in reflection geometry.
  • Direct probing of structural dynamics.
  • Analysis of methanol assemblies with varying structural order.

Main Results:

  • Thermal diffusion is the primary transport mechanism across 2D-layered methanol films lacking cross-plane stacking order.
  • Significantly faster ballistic energy transport is observed in 3D-ordered crystalline methanol solids.
  • A fundamental difference in energy transport behavior is linked to stacking order.

Conclusions:

  • Methanol assemblies exhibit distinct energy transport mechanisms based on their structural dimensionality (2D vs. 3D).
  • Vibrational coupling efficiency between van der Waals (vdW)-interacted methanol layers is critical.
  • A strong structure-property relationship governs energy transport dynamics in these systems.