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Related Experiment Video

Updated: Mar 16, 2026

Rendering SiO2/Si Surfaces Omniphobic by Carving Gas-Entrapping Microtextures Comprising Reentrant and Doubly Reentrant Cavities or Pillars

Rendering SiO2/Si Surfaces Omniphobic by Carving Gas-Entrapping Microtextures Comprising Reentrant and Doubly Reentrant Cavities or Pillars

Published on: February 11, 2020

Retention in Porous Layer Pillar Array Planar Separation Platforms.

Danielle R Lincoln¹, Nickolay V Lavrik², Ivan I Kravchenko²

¹Department of Chemistry, University of Tennessee , Knoxville, Tennessee 37996, United States.

Analytical Chemistry

|August 12, 2016

Summary

This summary is machine-generated.

Coating 2D pillar arrays with porous silicon oxide (PSO) significantly enhances surface area and analyte retention. This advancement enables improved separation capabilities for complex samples.

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Published on: June 12, 2018

Area of Science:

Materials Science
Analytical Chemistry
Surface Chemistry

Background:

Highly ordered, high-aspect-ratio, two-dimensional (2D) pillar arrays offer unique platforms for surface modification.
Enhancing surface area and retention capabilities is crucial for advanced analytical separations.

Purpose of the Study:

To investigate the impact of porous silicon oxide (PSO) coatings on the surface area and retention properties of 2D pillar arrays.
To demonstrate the utility of these modified arrays for analytical separations.

Main Methods:

Fabrication of 2D pillar arrays using photolithography.
Coating arrays with 50-250 nm of PSO via plasma-enhanced chemical vapor deposition.
Functionalization of PSO coatings with silane chemistry (octadecyltrichlorosilane or n-butyldimethylchlorosilane).

Main Results:

Theoretical calculations predict a 120-fold surface area increase with a 50 nm PSO layer.
Increased PSO thickness demonstrably enhanced analyte retention in capillary-action-driven and 1D separation experiments.
Successful two-dimensional separation of fluorescently derivatized amines was achieved.

Conclusions:

PSO-coated 2D pillar arrays provide significantly enhanced surface area and retention capabilities.
The thickness of the PSO layer is a critical factor in optimizing separation performance.
These fabricated platforms show promise for advanced analytical separation techniques.