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Percolation Diffusion into Self-Assembled Mesoporous Silica Microfibres.

John Canning^1,2, George Huyang³, Miles Ma⁴

¹Interdisciplinary Photonics Laboratories, School of Chemistry, The University of Sydney, Sydney NSW 2006, Australia. john.canning@sydney.edu.au.

Nanomaterials (Basel, Switzerland)

|March 29, 2017

Summary

This summary is machine-generated.

Diffusion into ordered mesoporous microfibers was studied. Rhodamine B rapidly diffused, while larger molecules like zinc tetraphenylporphyrin (ZnTPP) did not, indicating potential for molecular sieving applications.

Keywords:

colloids filters laser ablation inductive coupled mass spectroscopy mesoporous microfibres microfluidics microwires molecular sieves nano-composites nanoparticles nanopores self-assembly sensors super diffusion

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Synthesis and Characterization of Supramolecular Colloids

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Published on: April 22, 2016

Area of Science:

Materials Science
Chemical Engineering
Nanotechnology

Background:

Ordered mesoporous microfibers offer unique properties for molecular transport.
Understanding diffusion dynamics is crucial for designing advanced separation and filtration systems.

Purpose of the Study:

To investigate the percolation diffusion of different molecules into long, self-assembled mesoporous microfibers.
To elucidate the factors governing molecular transport and differentiate diffusion behaviors based on molecular size and properties.

Main Methods:

Optical transmission spectroscopy was employed to study rapid diffusion processes.
Laser ablation inductively coupled mass spectrometry (LA-ICP-MS) provided high-resolution diffusion analysis.
Diffusion coefficients (D) were determined for Rhodamine B and zinc compounds.

Main Results:

Rhodamine B exhibited rapid penetration (<5 s, D > 80 μm²∙s⁻¹) into the microfibers.
Larger molecules, such as zinc tetraphenylporphyrin (ZnTPP), showed minimal to no percolation.
LA-ICP-MS confirmed the limited entry of ZnTPP and quantified zinc acetate dihydrate diffusion (D~3 × 10⁻⁴ nm²∙s⁻¹).

Conclusions:

Molecular size and hydrophilicity significantly influence diffusion rates in ordered mesoporous microfibers.
The observed differences suggest potential for these microfibers as molecular sieves.
Findings support applications in filtration, molecular separation, and device development.