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Porous Silicon Microparticles for Delivery of siRNA Therapeutics

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Published on: January 15, 2015

Obstructed diffusion in silica colloidal crystals.

Benjamin J Rogers¹, Mary J Wirth

¹Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907, USA.

The Journal of Physical Chemistry. A

|March 19, 2013

Summary

This summary is machine-generated.

Hindered diffusion in silica colloidal crystals was experimentally studied. The obstruction factor for fluorescein and proteins was found to equal the porosity, with corrections for protein size exclusion.

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Area of Science:

Colloid science
Materials science
Physical chemistry

Background:

Hindered diffusion is crucial for understanding transport phenomena in porous materials.
Silica colloidal crystals offer tunable structures for studying diffusion barriers.
Previous models often oversimplify the complex interplay of pore geometry and particle size.

Purpose of the Study:

To experimentally investigate hindered diffusion in silica colloidal crystals.
To determine the relationship between diffusion obstruction and material porosity.
To compare experimental findings with theoretical predictions and other porous media.

Main Methods:

Utilized fluorescence recovery after photobleaching (FRAP) to measure diffusion coefficients.
Employed ionic conductivity measurements as an independent diffusion assessment.
Varied particle sizes (120-1300 nm) and determined porosity via flow measurements.

Main Results:

The obstruction factor for fluorescein directly correlated with porosity.
For proteins, obstruction factor equaled porosity after accounting for size exclusion.
Observed obstruction factors were lower than in chromatographic media but higher than theoretical predictions.

Conclusions:

Porosity is a primary determinant of hindered diffusion in silica colloidal crystals.
Current theoretical models may underestimate diffusion hindrance in ordered porous structures.
Findings provide insights for applications in filtration, drug delivery, and microfluidics.