期刊
JOURNAL OF CHEMICAL EDUCATION
卷 98, 期 4, 页码 1389-1396出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jchemed.0c01306
关键词
First-Year Undergraduate/General; Second-Year Undergraduate; Organic Chemistry; Inorganic Chemistry; Inquiry-Based/Discovery Learning; Dyes/Pigments; Physical Properties; Undergraduate Research
资金
- Faculte des Sciences/Universite Montpellier
- CNRS
- Institut Charles Gerhardt Montpellier
- Institut des Biomolecules Max Mousseron
- Labex CheMISyst/LabMuse Chimie
An inquiry-based approach was used to synthesize analogues of historical indigo and Maya blue pigments, creating new hues using a hydrothermal microwave synthesis method. The obtained Maya pigments can have very different colors from their initial indigo derivative, and undergo color change under annealing or mechanical grinding. The Tyrian purple/sepiolite chromism provides a visual illustration for students of the structural changes in sepiolite associated with its pores closure and water loss.
Syntheses of analogues of historical indigo and Maya blue pigments using an inquiry-based approach are presented. Derivatives of indigo were synthesized (in particular Tyrian purple) and used as vat dyes for dyeing cotton or wool fabrics or mixed with a sepiolite clay to create new hues or colors of Maya blues using a green chemistry hydrothermal microwave synthesis. The hydrothermal approach allows a very quick preparation of Maya analogue pigments (typically 1 h) while illustrating a green chemistry approach. The obtained Maya pigments can have very different colors (or not) from their initial indigo derivative and furthermore undergo color change under annealing (thermochromism) or mechanical grinding (tribochromism). In particular, the Tyrian purple/sepiolite chromism allows a direct visual illustration for students of the structural changes in sepiolite host-matrix associated with its pores closure and water loss.
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