Eggshell derived hydroxyapatite microspheres for chromatographic applications by a novel dissolution - precipitation method

Ashokan, Anbuthangam; Rajendran, Vivek; Kumar, T.S. Sampath; Jayaraman, Guhan

doi:10.1016/j.ceramint.2021.03.183

Cited by 22 publications

(14 citation statements)

References 25 publications

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“…In detail, the peak at 3422 cm −1 was associated with the stretching vibration of –OH [ 19 ], and the peak at 2923 cm −1 corresponded to the stretching vibration of –CH 2 in an organic manner [ 20 ]. The peaks at 2519, 2347, and 1794 cm −1 originated from the organic matter, the peak at 1453 cm −1 was a response to the anti-symmetric stretching mode of C–O, the peak at 1082 cm −1 was related to a symmetrical stretch of C–O, the peaks at 876 and 857 cm −1 represent out-of-plane angular vibrations of CO 3 2− , and the peak at 713 cm −1 represents an in-plane angular deformation of O–C–O [ 21 , 22 ]. As shown in Figure 2 c, the XRD patterns of the CSBF samples matched those of calcite (PDF#86-0174) and aragonite (PDF#75-2230), indicating that the main components of calcite and aragonite are calcium carbonate.…”

Section: Resultsmentioning

confidence: 99%

Comparative Study of Fire Resistance and Anti-Ageing Properties of Intumescent Fire-Retardant Coatings Reinforced with Conch Shell Bio-Filler

et al. 2021

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Conch shell bio-filler (CSBF) was prepared by washing, ultrasonicating, and pulverizing of conch shells and then was applied in waterborne intumescent fire-retardant coatings. The influence of CSBF on fire resistance and anti-ageing properties of intumescent fire-retardant coatings were studied by using different analytical methods. The fire protection and smoke density tests showed that when the mass fraction of CSBF was 3%, the resulting FRC3 coating had the optimum synergistic flame-retardant and smoke-suppression effects concomitant with a flame-spread rating of 10.7, equilibrium backside temperature of 152.4 °C at 900 s, and smoke-density rating value of 10.4%, which were attributed to the establishment of a more dense and stable intumescent char layer against heat and mass transfer. Thermogravimetric analysis indicated that the presence of CSBF increased the thermal stability and char-forming performance of the coatings, and the char residue of FRC3 rose to 34.6% at 800 °C from 28.6% of FRC0 without CSBF. The accelerated ageing test suggested that the incorporation of CSBF reduced the migration and decomposition of the flame retardants and the yellowing, blistering, and powdering phenomenon, thus improving the structural stability of the coating, resulting in better durability of flame retardancy and smoke-suppression performance.

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Section: Resultsmentioning

confidence: 99%

Comparative Study of Fire Resistance and Anti-Ageing Properties of Intumescent Fire-Retardant Coatings Reinforced with Conch Shell Bio-Filler

et al. 2021

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“…Hydroxyapatite (HAp) is a multi-purpose inorganic material with applications in the field of medicine, wastewater treatment, sensor, catalysis, and chromatography 1 , 2 . Among the various morphologies of HAp, the microsphere morphology is preferred because of its unique physical characteristics such as large surface area, better protein adsorption capacity, and superior flowability 3 , 4 . Therefore, several fabrication methods have been proposed for microsphere preparation.…”

Section: Introductionmentioning

confidence: 99%

“…Various methods have been developed to prepare HAp, such as biomimetic technique, solid–solid reaction, spray-drying, sol–gel, wet precipitation, emulsion, microwave-assisted synthesis, hydrothermal and template-assisted synthesis, etc. 1 , 4 . The precipitation process with aqueous orthophosphate and calcium sources appears to be the most common technique to prepare HAp particles.…”

Section: Introductionmentioning

confidence: 99%

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Process optimization for the rapid conversion of calcite into hydroxyapatite microspheres for chromatographic applications

Ashokan

Kumar

Jayaraman

2022

Sci Rep

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Microsphere hydroxyapatite (HAp) is widely used in various biomedical and chromatographic applications. The work described in this manuscript focuses on a dissolution precipitation method for production of HAp microspheres. This method overcomes certain drawbacks of conventional preparation methods used for HAp preparation, which produce polydisperse particles and are time-consuming and expensive. In the present work, the calcium carbonate (calcite) particles were directly and rapidly converted into HAp microspheres using an inexpensive dissolution precipitation method. The effects of the reaction temperature, time, and mechanical stirring rates were studied, and the reaction parameters were optimized. As confirmed by the XRD studies, the higher reaction temperature and time promote complete HAp conversion, while calcite residues were observed for lower temperatures and times. SEM images show the influence of reaction parameters on the surface microstructure of the microspheres produced. It was observed that the HAp microspheres undergo disintegration at a higher stirring rate. The reaction parameters optimized in this work were ideal for preparing HAp microspheres. The resultant HAp particles were utilized as matrices for chromatographic separation of protein mixtures.

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“…An alternative source of calcium to synthesize CCTO can utilize natural materials containing high calcium, such as eggshells. High calcium content in calcium carbonate (CaCO3) compounds makes eggshells a commodity that has the potential as a calcium source to synthesize calcium-based dielectric material including CaTiO3 [34][35][36] and Ca10(PO4)6(OH)2 [37][38][39]. Utilizing eggshells as calcium sources to synthesize CCTO has not yet been reported.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of CaCu3Ti4O12 utilizing eggshell waste as a calcium source: Structure, morphology, and dielectric properties

MADDU¹,

YULWAN²,

SOFIAN³

et al. 2022

J Met Mater Miner

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Calcium copper titanate (CaCu3Ti4O12, CCTO) has been synthesized utilizing eggshell waste as a source of calcium through the hydrothermal route, followed by annealing treatment at temperatures 950°C and 1050°C. The sample with annealing temperatures of 950°C and 1050°C is named CTO-A and CCTO-B, respectively. The structure, microstructure, and dielectric properties of CCTO samples were investigated. The X-ray diffraction analysis results confirmed that the pure phase of CCTO has been successfully synthesized as identified in the diffraction pattern. The average crystallite size of CCTO is quite large due to annealing at high-temperature. The morphology of CCTO by electron microscopy investigation showed the grains tends to agglomerate as the annealing temperature increases due to the solid-state diffusion. Dielectric property investigation showed the CCTO samples have a high dielectric constant at low frequencies and decrease with increasing frequency. Sample CCTO-A annealed at 950oC has a higher dielectric constant than sample CCTO-B annealed at 1050oC, otherwise, it has a lower tangent loss than the sample CCTO-B.

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Eggshell derived hydroxyapatite microspheres for chromatographic applications by a novel dissolution - precipitation method

Cited by 22 publications

References 25 publications

Comparative Study of Fire Resistance and Anti-Ageing Properties of Intumescent Fire-Retardant Coatings Reinforced with Conch Shell Bio-Filler

Comparative Study of Fire Resistance and Anti-Ageing Properties of Intumescent Fire-Retardant Coatings Reinforced with Conch Shell Bio-Filler

Process optimization for the rapid conversion of calcite into hydroxyapatite microspheres for chromatographic applications

Synthesis of CaCu3Ti4O12 utilizing eggshell waste as a calcium source: Structure, morphology, and dielectric properties

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