Characterizing Organic Monolithic Columns Using Capillary Flow Porometry and Scanning Electron Microscopy

Polyethylene glycol diacrylate monoliths prepared using different amounts of monomer, porogen ratio, and capillary dimensions were characterized using capillary flow porometry (CFP) and scanning electron microscopy (SEM). Our results reveal good agreement between SEM and CFP measurements for through...

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Published inAnalytical chemistry (Washington) Vol. 84; no. 1; pp. 247 - 254
Main Authors Aggarwal, Pankaj, Tolley, H. Dennis, Lee, Milton L
Format Journal Article
LanguageEnglish
Published Washington, DC American Chemical Society 03.01.2012
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Abstract Polyethylene glycol diacrylate monoliths prepared using different amounts of monomer, porogen ratio, and capillary dimensions were characterized using capillary flow porometry (CFP) and scanning electron microscopy (SEM). Our results reveal good agreement between SEM and CFP measurements for through-pore size distribution. The CFP measurements for monoliths prepared by the same procedure in capillaries with different diameters (i.e., 75, 150, and 250 μm) clearly confirmed a change in through-pore size distribution with capillary diameter, thus, certifying the need for in-column measurement techniques over bulk measurements (e.g., mercury intrusion porosimetry). The mean through-pore size varied from 3.52 to 1.50 μm with a change in capillary diameter from 75 to 250 μm. Consistent mean through-pore size distribution for capillary columns with the same internal diameter but with different lengths (1.5, 2, and 3 cm) confirms the high interconnectivity of the pores and independence of CFP measurements with respect to capillary length. CFP and SEM measurements not only allow pore structure analysis but also prediction of relative column performance. Monoliths with narrow through-pore size distribution (0.8–1.2 μm), small mean through-pore size, and thin skeletal size (0.55 μm) gave the best performance in terms of efficiency for polyethylene glycol diacrylate monoliths.
AbstractList Polyethylene glycol diacrylate monoliths prepared using different amounts of monomer, porogen ratio, and capillary dimensions were characterized using capillary flow porometry (CFP) and scanning electron microscopy (SEM). Our results reveal good agreement between SEM and CFP measurements for through-pore size distribution. The CFP measurements for monoliths prepared by the same procedure in capillaries with different diameters (i.e., 75, 150, and 250 μm) clearly confirmed a change in through-pore size distribution with capillary diameter, thus, certifying the need for in-column measurement techniques over bulk measurements (e.g., mercury intrusion porosimetry). The mean through-pore size varied from 3.52 to 1.50 μm with a change in capillary diameter from 75 to 250 μm. Consistent mean through-pore size distribution for capillary columns with the same internal diameter but with different lengths (1.5, 2, and 3 cm) confirms the high interconnectivity of the pores and independence of CFP measurements with respect to capillary length. CFP and SEM measurements not only allow pore structure analysis but also prediction of relative column performance. Monoliths with narrow through-pore size distribution (0.8-1.2 μm), small mean through-pore size, and thin skeletal size (0.55 μm) gave the best performance in terms of efficiency for polyethylene glycol diacrylate monoliths.
Polyethylene glycol diacrylate monoliths prepared using different amounts of monomer, porogen ratio, and capillary dimensions were characterized using capillary flow porometry (CFP) and scanning electron microscopy (SEM). Our results reveal good agreement between SEM and CFP measurements for through-pore size distribution. The CFP measurements for monoliths prepared by the same procedure in capillaries with different diameters (i.e., 75, 150, and 250 ...m) clearly confirmed a change in through-pore size distribution with capillary diameter, thus, certifying the need for in-column measurement techniques over bulk measurements (e.g., mercury intrusion porosimetry). The mean through-pore size varied from 3.52 to 1.50 ...m with a change in capillary diameter from 75 to 250 ...m. Consistent mean through-pore size distribution for capillary columns with the same internal diameter but with different lengths (1.5, 2, and 3 cm) confirms the high interconnectivity of the pores and independence of CFP measurements with respect to capillary length. CFP and SEM measurements not only allow pore structure analysis but also prediction of relative column performance. Monoliths with narrow through-pore size distribution (0.8-1.2 ...m), small mean through-pore size, and thin skeletal size (0.55 ...m) gave the best performance in terms of efficiency for polyethylene glycol diacrylate monoliths. (ProQuest: ... denotes formulae/symbols omitted.)
Author Lee, Milton L
Aggarwal, Pankaj
Tolley, H. Dennis
AuthorAffiliation Brigham Young University
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  givenname: Pankaj
  surname: Aggarwal
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  givenname: Milton L
  surname: Lee
  fullname: Lee, Milton L
  email: milton_lee@byu.edu
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Issue 1
Keywords Capillary column
Performance evaluation
Ethylene glycol
Scanning electron microscopy
Polyethylene
Pore structure
Size
Prediction
Pore size
Efficiency
Distribution
Technique
Mercury
Glycol
Language English
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2011 American Chemical Society
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Snippet Polyethylene glycol diacrylate monoliths prepared using different amounts of monomer, porogen ratio, and capillary dimensions were characterized using...
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acs
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SubjectTerms Analytical chemistry
Chemistry
Exact sciences and technology
Nanotubes
Polyethylene glycol
Pore size
Porosity
Scanning electron microscopy
Title Characterizing Organic Monolithic Columns Using Capillary Flow Porometry and Scanning Electron Microscopy
URI http://dx.doi.org/10.1021/ac203010r
https://www.ncbi.nlm.nih.gov/pubmed/22098132
https://www.proquest.com/docview/914700983
https://search.proquest.com/docview/916519602
Volume 84
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