Covalent immobilization of bromocresol purple on cellulose nanocrystals for use in pH-responsive indicator films
| Autor: | Hossein Khanjanzadeh, Byung-Dae Park |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
chemistry.chemical_classification
Polymers and Plastics Chemistry Organic Chemistry Polymer Cellulose acetate chemistry.chemical_compound X-ray photoelectron spectroscopy Covalent bond Attenuated total reflection Materials Chemistry Leaching (metallurgy) Colorimetric analysis Bromocresol purple Nuclear chemistry |
| Zdroj: | Carbohydrate polymers. 273 |
| ISSN: | 1879-1344 |
| Popis: | This study developed pH-indicator films by combining esterified cellulose nanocrystals (e-CNCs) with activated bromocresol purple (a-BCP) via covalent bonding for pH-sensitive color-changing applications. The e-CNC/a-BCP particles were incorporated into cellulose acetate polymer to prepare pH-sensitive color changing films. Binding of a-BCP to e-CNCs was proven by attenuated total reflection infrared (ATR-IR) spectroscopy and X-ray photoelectron spectroscopy (XPS). Colorimetric analysis showed that films containing 10% or 15% e-CNC/a-BCP particles had critical color changes either at pH 4–5, or pH 7–8. The films with 10% e-CNC/a-BCP particles also revealed excellent leaching resistance under acidic conditions. Color changes were reversible between pH 2 and 10. These pH-indicator films had visible color changes in response to pH variations, color reversibility, leaching resistance, and sufficient rigidity even though mechanical properties decreased as the e-CNC/a-BCP content increased from 0% to 15%. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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