An evergreen blue. Spectroscopic properties of Egyptian blue from pyramids to Raphael, and beyond

Sgamellotti, Antonio; Anselmi, Chiara

doi:10.1016/j.ica.2021.120699

Cited by 12 publications

(12 citation statements)

References 48 publications

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“…the well-known Bust of Queen Nefertiti). [49][50][51][52][53] HB and HP, on the other side, were mostly employed in the times of the Qin and Han dynasties (≈220 BC-220 AD), as witnessed by e.g. the Terracotta Warriors of the tomb of Emperor Qin Shihuangdi in Xi'an.…”

Section: Sebastian Krussmentioning

confidence: 99%

“…Indeed, thanks to a broad excitation range, a strong NIR fluorescence and a long excited state lifetime, the signals of HB, HP and, above all, of the highly chemically stable EB can be easily discriminated in art- works from other pigments. [50][51][52][53]95,[112][113][114] However, exciting speculations about the employment of bulk EB, HB and HP in diverse technological fields have been made, including telecommunications, lasers, sensing/labelling for bioimaging, component of cool roofing and facades, luminescent solar concentrators and more. 50,55,58,59,66,69,91,95,97 With regards to the down-sized EB, HB and HP, several applications for photonics have been theorized and demonstrated (Tables 1-3).…”

Section: Applications In State-of-the-art Technologiesmentioning

confidence: 99%

“…[50][51][52][53]95,[112][113][114] However, exciting speculations about the employment of bulk EB, HB and HP in diverse technological fields have been made, including telecommunications, lasers, sensing/labelling for bioimaging, component of cool roofing and facades, luminescent solar concentrators and more. 50,55,58,59,66,69,91,95,97 With regards to the down-sized EB, HB and HP, several applications for photonics have been theorized and demonstrated (Tables 1-3). For example, Borisov et al have showcased applications of ball-milled EB, HB and a strontium homologue (SrCuSi 4 O 10 , SC) as optical chemosensors.…”

Section: Applications In State-of-the-art Technologiesmentioning

confidence: 99%

“…50–53,95,112–114 However, exciting speculations about the employment of bulk EB, HB and HP in diverse technological fields have been made, including telecommunications, lasers, sensing/labelling for bioimaging, component of cool roofing and facades, luminescent solar concentrators and more. 50,55,58,59,66,69,91,95,97…”

Section: Applications In State-of-the-art Technologiesmentioning

confidence: 99%

See 3 more Smart Citations

Preparation, properties and applications of near-infrared fluorescent silicate nanosheets

Selvaggio

Kruss

2022

Nanoscale

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Section: Sebastian Krussmentioning

confidence: 99%

Section: Applications In State-of-the-art Technologiesmentioning

confidence: 99%

Section: Applications In State-of-the-art Technologiesmentioning

confidence: 99%

Section: Applications In State-of-the-art Technologiesmentioning

confidence: 99%

See 2 more Smart Citations

Preparation, properties and applications of near-infrared fluorescent silicate nanosheets

Selvaggio

Kruss

2022

Nanoscale

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“…The possibility of decorating these nanomaterials with (bio)molecules of interest could furthermore allow therapeutic treatment, sensing and imaging applications 19 . Egyptian Blue (CaCuSi4O10, EB) is the most ancient pigment in the history of mankind, having its origins dated back to Ancient Egypt (≈ 2500 BC) 20,21 . This calcium copper tetrasilicate displays a layered crystal structure which allows to prepare nanosheets (NS) via simple stirring in hot water [22][23][24][25][26][27] .…”

Section: Introductionmentioning

confidence: 99%

Covalently Functionalized Egyptian Blue Nanosheets for Near-Infrared Bioimaging

Selvaggio

Herrmann

Hill

et al. 2022

Preprint

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Fluorophores emitting in the near-infrared (NIR) wavelength region present optimal characteristics for photonics and especially bioimaging. Unfortunately, only few NIR fluorescent materials are known and even fewer are biocompatible. For this reason, the scientific interest in designing novel NIR fluorophores is very high. Egyptian Blue (CaCuSi4O10, EB) is a NIR fluorescent layered silicate that can be exfoliated into fluorescent nanosheets (EB-NS). So far, its surface chemistry has not been tailored but this is crucial for colloidal stability and biological targeting. Here, we demonstrate covalent surface functionalization of EB nanosheets (EBfunc) via Si-H activation using hydrosilanes with variable functionalities. EB-NS were first grafted with the visible fluorescent pyrene (Pyr) moieties to prove conjugation by colocalization of the Vis/NIR fluorescence on the (single) EB-NS level. The same procedure was performed and validated with carboxyl group (COOH)-containing hydrosilanes. These groups can serve as generic handle for further (bio)functionalization of the EB-NS surface. Finally, folic acid (FA) was conjugated to these COOH-functionalized EB-NS to target folic acid receptor-expressing cancer cells. These results highlight the potential of this surface chemistry approach to modify EB-NS and enable targeted NIR imaging for biomedical applications.

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Egyptian blue, Chinese blue, and related two-dimensional silicates: from antiquity to future technologies. Part A: general properties and historical uses

Nicola

Gobetto

Mašić

2023

Rend. Fis. Acc. Lincei

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The ancient Egyptian blue pigment was developed over 5000 years ago and was used extensively for around four millennia until its use mysteriously declined dramatically during the Early Middle Ages. It recently attracted a lot of attention along with some related materials, leading to a fast-growing number of applications in fields, such as sensors, solar concentrators, energy-saving, and medicine. The new surge in interest began in 1996 with the discovery of their intense NIR photoluminescence that surprisingly can be triggered even by visible light. In 2013, the possibility of exfoliating them and producing NIR luminescent nanosheets was established, expanding the family of 2D nanomaterials. More recently, the discovery of their high antibacterial effects and biocompatibility, and very promising optical, electric and magnetic properties, has further boosted their applications. The characteristics of Egyptian blue are due to its main component: the very stable crystalline compound CaCuSi4O10. This tetragonal sheet silicate is the synthetic analogous of the rare cuprorivaite mineral. In Part A of this review, we summarize the historical uses and main properties (i.e., composition, structure, color, stability, luminescence, and biological activity) of cuprorivaite and related 2D silicates, i.e., BaCuSi4O10 (the main constituent of the ancient pigment Chinese Blue), BaCuSi2O6 (the main constituent of the ancient pigment Chinese Purple), SrCuSi4O10 (synthetic analogous of wesselsite) and BaFeSi4O10 (synthetic analogous of gillespite). The Part B of the review will focus on the modern rediscovery of these materials, their modern synthesis and exfoliation, and the innovative applications based on their properties.

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An evergreen blue. Spectroscopic properties of Egyptian blue from pyramids to Raphael, and beyond

Cited by 12 publications

References 48 publications

Preparation, properties and applications of near-infrared fluorescent silicate nanosheets

Preparation, properties and applications of near-infrared fluorescent silicate nanosheets

Covalently Functionalized Egyptian Blue Nanosheets for Near-Infrared Bioimaging

Egyptian blue, Chinese blue, and related two-dimensional silicates: from antiquity to future technologies. Part A: general properties and historical uses

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