Luminescent calcium carbonate micro ‘bow ties’

Donnelly, Fearghal Colm; Purcell-Milton, Finn; Dunne, Peter W.; Rulikowska, Aleksandra; Alguacil, Victor; Gun’ko, Yurii K.

doi:10.1016/j.mtcomm.2019.100590

Cited by 6 publications

(10 citation statements)

References 31 publications

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“…Therefore, alterations, new phases and the distribution of trace elements can be successfully revealed by surface-mapping heterogeneous carbonate materials through SEM-CL and LIF. This becomes especially important in the case of REE-doped synthetic CaCO 3 crystals, which are preferentially produced through the carbonation of Ca(OH) 2 under different settings, and are used in multifunctional applications such as solar cells, sensing and detection, and biological imaging 62–64 . For instance, binary CaCO 3 -Tb complexes used in the production of highly fluorescent composite materials could be readily investigated using both LIF and SEM-CL, due to the prominent Tb 3+ emissions in both calcite and aragonite and the suppressed Mn 2+ signal in pyrogenic carbonates 63 .…”

Section: Resultsmentioning

confidence: 99%

Luminescence reveals variations in local structural order of calcium carbonate polymorphs formed by different mechanisms

Toffolo

Ricci

Caneve

et al. 2019

Sci Rep

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In nature, calcium carbonate (CaCO3) in the form of calcite and aragonite nucleates through different pathways including geogenic and biogenic processes. It may also occur as pyrogenic lime plaster and laboratory-precipitated crystals. All of these formation processes are conducive to different degrees of local structural order in CaCO3 crystals, with the pyrogenic and precipitated forms being the least ordered. These variations affect the manner in which crystals interact with electromagnetic radiation, and thus formation processes may be tracked using methods such as X-ray diffraction and infrared spectroscopy. Here we show that defects in the crystal structure of CaCO3 may be detected by looking at the luminescence of crystals. Using cathodoluminescence by scanning electron microscopy (SEM-CL) and laser-induced fluorescence (LIF), it is possible to discern different polymorphs and their mechanism of formation. We were thus able to determine that pyrogenic calcite and aragonite exhibit blue luminescence due to the incorporation of distortions in the crystal lattice caused by heat and rapid precipitation, in agreement with infrared spectroscopy assessments of local structural order. These results provide the first detailed reference database of SEM-CL and LIF spectra of CaCO3 standards, and find application in the characterization of optical, archaeological and construction materials.

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Section: Resultsmentioning

confidence: 99%

Luminescence reveals variations in local structural order of calcium carbonate polymorphs formed by different mechanisms

Toffolo

Ricci

Caneve

et al. 2019

Sci Rep

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“…However, the biomimetic synthesis of guanine crystals with fluorescent function remains a great challenge. Doping functional molecules or nanoparticles into organic or inorganic crystals is an effective strategy to broaden the properties of nanomaterials such as optics, [26–30] magnetism, [28] and mechanics [31,32] . Fakhrullin et al.…”

Section: Introductionmentioning

confidence: 99%

“…[25] However, the biomimetic synthesis of guanine crystals with fluorescent function remains a great challenge. Doping functional molecules or nanoparticles into organic or inorganic crystals is an effective strategy to broaden the properties of nanomaterials such as optics, [26][27][28][29][30] magnetism, [28] and mechanics. [31,32] Fakhrullin et al synthesized magnetically responsive CaCO 3 microcrystals by incorporating citrate stabilized iron oxide magnetic nanoparticles into calcite.…”

Section: Introductionmentioning

confidence: 99%

Biomimetic Synthesis of Organic Molecular‐Doped Fluorescent Guanine Crystals with Pearlescence

Guo

Zhang

Jin

et al. 2023

Chemistry A European J

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Biomimetic synthesis of guanine crystals has been focused on in the last years. However, multi-functional guanine crystals occluded with fluorescent molecules have not been realized in the laboratory. Here, the controllable synthesis of guanine crystal microplatelets with fluorescence and pearlescence was achieved for the first time by incorporating Nile red (NR) or fluorescein isothiocyanate (FITC) molecules into guanine crystals. The synthesized fluorescent guanine crystals are pure β-phase anhydrous guanine single crystals. Aqueous suspensions with NR-and FITC-doped guanine crystals exhibit distinct pearlescence. The fluorescence intensities of NR and FITC were greatly enhanced after being doped into guanine crystals due to the inhibition of aggregation-caused quenching. Moreover, films composed of fluorescent guanine microplatelets exhibit high diffuse reflection intensity (70 %). This work provides a strategy to synthesize multifunctional materials composed of organic crystals occluded with dyes.

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“…Precipitated calcium carbonate (PCC) has emerged as a potential inorganic material with numerous industrial applications, particularly as filler in polymers, paints, and paper [1,2]. Among three available polymorphic forms of PCC (i.e., calcite, aragonite, and vaterite), under ambient conditions, calcite is thermodynamically most stable while vaterite can be considered unstable [2]. Aragonite being metastable has been extensively reviewed considering its biocompatible and superior mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

“…Other applications include water treatment [4], replacement and additive to bone [5], and biomedical activities [6]. Synthesis of acicular shaped aragonite is evident in many studies [1,2,7,8]. A study reported that a controlled injection of CO 2 in calcium hydroxide slurry suspended magnesium chloride aqueous solution can synthesize needle-shaped aragonite [7].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization and Mechanism Study of Green Aragonite Crystals from Waste Biomaterials as Calcium Supplement

Habte

Khan

Shiferaw³

et al. 2020

Sustainability

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In present work, environmentally benign green aragonite crystals were synthesized from waste chicken eggshells and bivalve seashells through a simple and low-cost wet carbonation method. This method involves a constant stirring of calcium oxide slurry and magnesium chloride suspension in aqueous solution with constraint carbon dioxide injection at 80 °C. The physicochemical properties of the synthesized aragonite were further compared with the aragonite synthesized from commercial calcium oxide. The morphological analysis, such as acicular shape and optimum aspect ratio (~21), were confirmed by scanning electron microscopy. The average crystal size (10–30 µm) and specific surface area (2–18 m2 g−1) were determined by particle size and Brunauer–Emmett–Teller analysis, respectively. Moreover, a schematic crystal growth mechanism was proposed to demonstrate the genesis and progression of aragonite crystal. Green aragonite can bridge the void for numerous applications and holds the potential for the commercial-scale synthesis with eggshells and bivalve seashells as low-cost precursors.

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Luminescent calcium carbonate micro ‘bow ties’

Cited by 6 publications

References 31 publications

Luminescence reveals variations in local structural order of calcium carbonate polymorphs formed by different mechanisms

Luminescence reveals variations in local structural order of calcium carbonate polymorphs formed by different mechanisms

Biomimetic Synthesis of Organic Molecular‐Doped Fluorescent Guanine Crystals with Pearlescence

Synthesis, Characterization and Mechanism Study of Green Aragonite Crystals from Waste Biomaterials as Calcium Supplement

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