Novel cellulose-based halochromic test strips for naked-eye detection of alkaline vapors and analytes

Talanta
Hussein Abou-YousefSamir Kamel

Abstract

A simple, portable and highly sensitive naked-eye test strip is successfully prepared for optical detection of gaseous and aqueous alkaline analytes. Novel pH-sensory tricyanofuran-hydrazone (TCFH) disperse colorant containing a hydrazone recognition functional moiety is successfully synthesized via azo-coupling reaction between active methyl-containing tricyanofuran (TCF) heterocycle and diazonium salt of 4-aminobenzaldehyde followed by Knoevenagel condensation with malononitrile. UV-vis absorption spectra display solvatochromism and reversible color changes of the TCFH solution in dimethyl sulfoxide in response to pH variations. We investigate the preparation of hydrophobic cellulose/polyethylene terephthalate composites characterized by their high affinity for disperse dyes. Composite films made from CA, Cell/CA, PET/CA, and Cell/PET-CA are produced via solvent-casting procedure using 10-30% modified cellulose or modified polyethylene terephthalate. The mechanical properties and morphologies of these composite films are investigated. The prepared pH-sensory hydrazone-based disperse dye is then applied to dye the produced cellulose-based composite films employing the high temperature pressure dyeing procedure. The produced ha...Continue Reading

Citations

Jun 21, 2020·Biosensors·Samir Kamel, Tawfik A Khattab
Jan 5, 2019·Journal of Fluorescence·Fatimah A M Al-Zahrani
Dec 16, 2019·Environmental Science and Pollution Research International·Tawfik A KhattabMohamed Rehan

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