Characterization of colloidal and particulate silica by field-flow fractionation

J. Calvin Giddings, S. Kim Ratanathanawongs, Bhajendra N. Barman, Myeong Hee Moon, Guangyue Liu, Brenda L. Tjelta, Marcia E. Hansen

Research output: Chapter in Book/Report/Conference proceedingChapter


Particle-size and mass distribution curves, along with information on particle porosity, density, shape, and aggregation, can be obtained for submicrometer- and supramicrometer-size silica materials suspended in either aqueous or nonaqueous media by field-flow fractionation (FFF). Narrow fractions can readily be collected for confirmation or further characterization by microscopy and other means. Among the silicas examined were different types of colloidal microspheres, fumed silica, and various chromatographic supports. Size distribution curves for aqueous silica suspensions were obtained by both sedimentation FFF and flow FFF and for nonaqueous suspensions by thermal FFF. Populations of aggregates and oversized particles were isolated and identified in some samples. The capability of FFF to achieve the high-resolution fractionation of silica is confirmed by the collection of fractions and their examination by electron microscopy.

Original languageEnglish
Title of host publicationColloidal Silica
Subtitle of host publicationFundamentals and Applications
PublisherCRC Press
Number of pages16
ISBN (Electronic)9781420028706
ISBN (Print)9780824709679
Publication statusPublished - 2005 Jan 1

Bibliographical note

Publisher Copyright:
© 2005 by Taylor & Francis Group, LLC.

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • General Chemical Engineering


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