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Characterizing organic monolithic columns using capillary flow porometry and scanning electron microscopy.

Pankaj Aggarwal1, H Dennis Tolley, Milton L Lee

  • 1Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602, USA.

Analytical Chemistry
|November 22, 2011
PubMed
Summary

Capillary flow porometry (CFP) and scanning electron microscopy (SEM) accurately measure pore size in polyethylene glycol diacrylate monoliths. In-column measurements are crucial for predicting column performance, with smaller pores enhancing efficiency.

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Chromatography

Background:

  • Polyethylene glycol diacrylate monoliths are used in chromatography.
  • Characterizing monolith pore structure is essential for optimizing performance.
  • Traditional bulk measurement techniques may not accurately reflect in-column conditions.

Purpose of the Study:

  • To characterize polyethylene glycol diacrylate monoliths using capillary flow porometry (CFP) and scanning electron microscopy (SEM).
  • To evaluate the impact of capillary dimensions on pore size distribution.
  • To correlate pore structure with chromatographic performance.

Main Methods:

  • Preparation of polyethylene glycol diacrylate monoliths with varying monomer, porogen, and capillary dimensions.
  • Characterization using capillary flow porometry (CFP) and scanning electron microscopy (SEM).
  • Analysis of through-pore size distribution, mean through-pore size, and skeletal size.

Main Results:

  • Good agreement was found between SEM and CFP measurements for through-pore size distribution.
  • Capillary diameter significantly influenced through-pore size distribution, highlighting the need for in-column measurements.
  • Mean through-pore size ranged from 1.50 to 3.52 μm with varying capillary diameters.
  • CFP measurements were independent of capillary length, indicating high pore interconnectivity.
  • Monoliths with narrow pore size distribution and small mean/skeletal sizes exhibited superior chromatographic efficiency.

Conclusions:

  • CFP and SEM are reliable methods for pore structure analysis and performance prediction of chromatographic monoliths.
  • In-column measurement techniques like CFP are superior to bulk methods for characterizing monoliths.
  • Optimizing monolith pore structure, specifically achieving narrow distributions and smaller pore sizes, is key to enhancing chromatographic performance.