Direct measurement of crosslinked surface layer in superabsorbent poly(acrylic acid)

Jisoo Ha, Minsu Kim, Wooseop Lee, Hoyeon Lee, Changsun Han, Won Gun Koh, Du Yeol Ryu

Research output: Contribution to journalArticle

5 Citations (Scopus)


We propose a simple and quantitative method to evaluate thickness of crosslinked surface layer (tx) for superabsorbent poly(acrylic acid) (PAA) materials using a fluorescent dye of rhodamine B (RhB). The electrostatic attraction between the cationic amine group of dye and the anionic carboxylate group of PAA allows us to measure the fluorescent contrast since the surface-crosslinking causes a significant decrease in concentration of carboxylate group compared to that of inner region. Our method utilizing the distinct adsorption difference of RhB visualizes the crosslinked surface (or shell) layer and successfully demonstrates a direct characterization of tx in a dry state of superabsorbent materials, regardless of irregular particle shape.

Original languageEnglish
Pages (from-to)33-36
Number of pages4
JournalMaterials Letters
Publication statusPublished - 2018 Oct 1

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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