| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 7146413 | Sensors and Actuators B: Chemical | 2014 | 10 Pages |
Abstract
Hybrid halochromic sensor coatings were realized immobilizing Nitrazine Yellow (NY) onto cotton fabrics via the epoxy group of 3-glycidoxypropyltrimethoxysilane (GPTMS) silica precursor in acidic condition. Boron trifluoride diethyl etherate (BF3OEt2) in a various percentage range (1-10%, w/w GPTMS) has been used to catalyze the epoxide ring opening. In order to optimize the system, an FTIR study has been developed and kinetic data were obtained for the epoxy ring opening process. A linear correlation between the obtained kinetic rates and BF3 percentage was observed. By nuclear magnetic resonance (NMR) analysis in solution the real structure of NY, derived from an attack of diazonium salt to para hydroxyl position, was confirmed and the final product of the reaction between NY and GPTMS was characterized. Finally, the different amounts of catalyst were found to affect the coatings wash fastness and the halochromic response of the cellulose-based sensors.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Emanuela Guido, Claudio Colleoni, Karen De Clerck, Maria Rosaria Plutino, Giuseppe Rosace,