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Molecular mobility under nanometer scale confinement.

Taek-Soo Kim¹, Reinhold H Dauskardt

¹Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, USA.

|April 16, 2010

Summary

The free volume theory of diffusion breaks down for organic molecules in nanoporous films. Alkane mobility decreases with chain length, contrary to bulk behavior, indicating altered molecular dynamics under confinement.

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Area of Science:

Materials Science
Physical Chemistry
Nanotechnology

Background:

Molecular mobility in bulk materials is well-described by free volume theory.
Nanoscale confinement significantly alters molecular transport properties compared to bulk.
Organosilicate films with connected nanoporosity present a unique system for studying confined diffusion.

Purpose of the Study:

To investigate the diffusion of linear alkanes in organosilicate nanoporous films.
To determine if conventional free volume theory applies to confined alkane diffusion.
To elucidate the influence of molecular chain length, polarity, and pore size on confined mobility.

Main Methods:

Utilized organosilicate films with connected nanoporosity.
Studied the diffusion of linear alkane molecules.
Analyzed the relationship between molecular chain length and mobility.
Investigated the impact of molecular polarity and pore size on diffusion dynamics.

Main Results:

The free volume theory of diffusion breaks down under nanoscale confinement.
Alkane mobility decreased with increasing chain length, unlike bulk behavior.
Activation energy for diffusion decreased with chain length, suggesting increasing free volume.
Molecular mobility was suppressed by increased polarity and decreased pore size.

Conclusions:

Conventional free volume theory is inadequate for describing alkane diffusion in nanoporous organosilicate films.
Confined alkane diffusion exhibits unique dependencies on chain length, polarity, and pore size.
These findings highlight the distinct nature of molecular transport in nanoscale environments.