Dynamic Colour Change of Multifunctional Thermochromic-Fluorescent Pigments
| Autor: | Marta Klanjšek Gunde, Ondrej Panák, Marie Kaplanová, Markéta Držková |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
010407 polymers
Materials science 02 engineering and technology 01 natural sciences Pigment Organic chemistry General Materials Science chemistry.chemical_classification Thermochromism Mechanical Engineering Spectrofluorometer Polymer 021001 nanoscience & nanotechnology Condensed Matter Physics Fluorescence Reflectivity 0104 chemical sciences Colour difference Chemical engineering chemistry Mechanics of Materials visual_art visual_art.visual_art_medium sense organs Colour contrast 0210 nano-technology |
| Zdroj: | Materials Science Forum. 859:162-168 |
| ISSN: | 1662-9752 |
| DOI: | 10.4028/www.scientific.net/msf.859.162 |
| Popis: | The aim of presented paper was to prepare and characterise multifunctional thermochromic-fluorescent pigments with potential application in anti-counterfeiting patterns in security printing. Pigments were prepared by microencapsulation of chosen thermochromic system into melamine formaldehyde resin and the resin was modified with Uranine and Acid Red 52 fluorescent dyes, respectively. The fluorescence at low and high temperature was measured by spectrofluorometer. The concentration of 2.3 × 10–5 grams of fluorescent dye per one gram of polymer is sufficient for detection of fluorescence of modified polymeric shell. The dynamic colour change of prepared pigments was analysed in terms of cumulative colour difference obtained from reflectance measurements. Resulting multifunctional pigments exhibit much lower colour contrast and wider temperature sensitive interval in comparison with the bulk thermochromic system. However, the concept of two levels of verification based on two types of colour change embodied in one pigment has been approved. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|