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

3 Citations (Scopus)

Abstract

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
Volume228
DOIs
Publication statusPublished - 2018 Oct 1

Fingerprint

carbopol 940
rhodamine B
acrylic acid
Acrylics
surface layers
rhodamine
carboxylates
Acids
Dyes
dyes
crosslinking
Fluorescent Dyes
Crosslinking
attraction
Amines
Electrostatics
amines
Coloring Agents
electrostatics
Adsorption

All Science Journal Classification (ASJC) codes

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

Cite this

Ha, Jisoo ; Kim, Minsu ; Lee, Wooseop ; Lee, Hoyeon ; Han, Changsun ; Koh, Won Gun ; Ryu, Du Yeol. / Direct measurement of crosslinked surface layer in superabsorbent poly(acrylic acid). In: Materials Letters. 2018 ; Vol. 228. pp. 33-36.
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Direct measurement of crosslinked surface layer in superabsorbent poly(acrylic acid). / Ha, Jisoo; Kim, Minsu; Lee, Wooseop; Lee, Hoyeon; Han, Changsun; Koh, Won Gun; Ryu, Du Yeol.

In: Materials Letters, Vol. 228, 01.10.2018, p. 33-36.

Research output: Contribution to journalArticle

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AU - Ha, Jisoo

AU - Kim, Minsu

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AU - Lee, Hoyeon

AU - Han, Changsun

AU - Koh, Won Gun

AU - Ryu, Du Yeol

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