Fabrication of Single-Crystalline Calcite Needle-Like Particles Using the Aragonite–Calcite Phase Transition

Kezuka, Yuki; Kawai, Kosuke; Eguchi, Kenichiro; Tajika, Masahiko

doi:10.3390/min7080133

Cited by 25 publications

(10 citation statements)

References 22 publications

(36 reference statements)

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“…The extra specific surface area of chicken eggshells derived green aragonite can also be justified by reduced particle size (discussed earlier). These low surface areas indicated the presence of a smooth surface with negligible pores in agreement with the previous study [25].…”

Section: Bet Analysissupporting

confidence: 92%

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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Section: Bet Analysissupporting

confidence: 92%

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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“…[50] It should also be emphasized that the morphology of these polymorphs changes with phase transformation, from the spherical to dendritic, lenslike and cubic for the amorphous, aragonite, vaterite and calcite, respectively. [50][51][52] F I G U R E 6 X-ray diffractometry patterns of the three pastes after immersion in simulated body fluid solution at different days According to Monchau et al, calcite is nontoxic and shows appropriate osteogenic activity and accelerates cell proliferation; however, due to its high hydrophobicity, its cell promoting effect is weaker than β-three calcium phosphate and hydroxyapatite. In comparison with calcium phosphate-based ceramics, calcite shows a lower rate of hydroxyapatite precipitation so that the apatite phase forms on its surface after 120 days.…”

Section: Evaluation Of the Paste After Immersion In Sbf Solutionmentioning

confidence: 99%

Rheology, injectability, and bioactivity of bioactive glass containing chitosan/gelatin, nano pastes

Sohrabi

Yekta

Rezaie

et al. 2020

J of Applied Polymer Sci

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Bioactive pastes containing bioactive sol–gel derived glass (BG) and various amounts of chitosan (Cn) and gelatin (Gel) were prepared in this study. To be exact, three pastes were prepared by mixing 25 parts by weight of glass powder with (a) 100 parts by weight of a 3 wt% acetic acid‐based chitosan solution, (b) 100 parts by weight of a 3 wt% water‐based gelatin solution, and (c) 100 parts by weight of a solution containing equal amounts of the above‐mentioned solutions. The bioactivity of the composite samples was evaluated by the immersion of the prepared pastes into the simulated body fluid (SBF) solution. The samples were also analyzed by X‐ray diffractometry (XRD), Brunauer–Emmett–Teller (BET), scanning electron microscope (SEM), Fourier transform infrared (FTIR), and atomic absorption spectroscopy (AAS). The results indicated better apatite formation capacity on the glass‐/chitosan‐/gelatin‐injected paste after 14 days. Furthermore, unlike the chitosan containing paste, the gelatin‐containing sample was injectable and displayed viscoelastic behavior as determined by conducting the rheology test in oscillation mode. In addition, while chitosan made the paste more viscous, it improved the washout resistance when compared to the gelatin‐containing sample. The experimental results also indicate the formation of spherical calcites in the pastes prior to immersion into the SBF solution.

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“…An initial weight loss of ~1 wt % until the temperature reaches 300 • C is mainly attributed to desorption of water (Figure 12A, m/z = 18) and organic species physically adsorbed on the particle surface. Thereafter, at ~600 • C, an onset of the main thermal event is visible (Figure 12B), which is the thermal decomposition of CaCO 3 with CO 2 release according to the equation 1 (Figure 12A, m/z = 44) [41]. The total weight loss is 32.7%, which, after subtracting 1% of the loss associated with water desorption, is the product of the decomposition of CaCO 3 to CaO and CO 2 .…”

Section: Resultsmentioning

confidence: 99%

Opoka—Sediment Rock as New Type of Hybrid Mineral Filler for Polymer Composites

et al. 2021

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The work presents a comprehensive profile of the physicochemical characteristics of opoka sedimentary rock in the context of its use as a hybrid filler for thermoplastics. Determining the functional parameters of the studied filler was the main aim of this research. Thermal treatment leads to changes in its morphology and phase composition. A wide range of physicochemical techniques was used, such as low-temperature nitrogen adsorption, FT-IR, TGA, XRD, optical, and electron microscopy. The susceptibility of the material to micronisation was also tested (ball milling). Due to its widespread occurrence, opoka can be an attractive alternative to fillers such as silica or chalk. In order to verify this statement, polypropylene composites thereof were prepared by melt blending and injection molding, and studied by mechanical testing and microscopic imaging.

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Fabrication of Single-Crystalline Calcite Needle-Like Particles Using the Aragonite–Calcite Phase Transition

Cited by 25 publications

References 22 publications

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

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

Rheology, injectability, and bioactivity of bioactive glass containing chitosan/gelatin, nano pastes

Opoka—Sediment Rock as New Type of Hybrid Mineral Filler for Polymer Composites

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