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New Insights in the Synthesis and Applications of Hydroxyapatite and Composites

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A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Advanced and Functional Ceramics and Glasses".

Deadline for manuscript submissions: closed (10 July 2023) | Viewed by 7348

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Dr. Ewa Skwarek

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Faculty of Chemistry, Maria Curie-Sklodowska University in Lublin, Sq. Maria Curie-Skłodowska 2, PL-20031 Lublin, Poland
Interests: hydroxyapatite; metal oxide; composites; physicochemical properties
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Dear Colleagues,

The main interest of many research centers is the preparation of new, modern, and technologically advanced materials that are both cheap, easily available, and effective in operation and at the same time minimize process times. This Special Edition, entitled “New Insights in Synthesis and Applications of Hydroxyapatite and Composites”, is devoted to the characterization of new types of hydroxyapatite and its composites syntheses and modifications, mainly intended to solve environmental and medical problems. Hydroxyapatite can be obtained by a variety of methods. In general, the following groups can be distinguished: wet methods, dry methods, high temperature methods, and combined methods. Among these techniques, more specific approaches can be highlighted. In recent research, the most common methods are wet methods, including chemical precipitation. The hydrothermal method is also frequently used. Moreover, some scientists utilize the sol–gel method. Some experiments employ techniques using microwaves, ultrasounds or pyrolysis. In turn, the biomimetic method is favored in biological studies. Each synthetic route affects the structure, crystallinity, form, and proportion of the resulting composites. The publication should include innovative synthesis strategies to obtain inexpensive materials or functionalities to improve their adsorption capacity and selectivity. Articles containing reviews and research results are acceptable.

Dr. Ewa Skwarek
Guest Editor

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Keywords

synthesis
applications
hydroxyapatite
composites
physicochemical properties
colloid system
electrical double layer

Published Papers (3 papers)

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Research

19 pages, 9016 KiB

Open AccessArticle

Hydroxyapatite Nanopowders for Effective Removal of Strontium Ions from Aqueous Solutions

by Silviu Adrian Predoi, Steluta Carmen Ciobanu, Mariana Carmen Chifiriuc, Mikael Motelica-Heino, Daniela Predoi and Simona Liliana Iconaru

Materials 2023, 16(1), 229; https://doi.org/10.3390/ma16010229 - 27 Dec 2022

Cited by 9 | Viewed by 1676

Abstract

Drinking water contamination has become a worldwide problem due to the highly negative effects that pollutants can have on human organisms and the environment. Hydroxyapatite (HAp) has the appropriate properties for the immobilization of various pollutants, being considered amongst the most cost-effective materials for water decontamination. The main objective of this study was to use synthesized hydroxyapatite for the elimination of Sr²⁺ ions from contaminated solutions. The hydroxyapatite used in the decontamination process was synthesized in the laboratory using an adapted method. The hydroxyapatite powder (HAp) resulting from the synthesis was analyzed both before and after the elimination of Sr²⁺ ions from contaminated solutions. The efficiency of the HAp nanoparticles in removing Sr²⁺ ions from contaminated solution was determined by batch adsorption experiments. X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX), scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR) were used to study the HAp samples before and after the removal of Sr²⁺ ions. The ability of HAp nanoparticles to eliminate strontium ions from contaminated solutions was established. Moreover, the removal of Sr²⁺ ions from the contaminated aqueous solutions was highlighted by ultrasound measurements. The value of the stability parameter calculated by ultrasonic measurements after the removal of Sr²⁺ ions from the contaminated solution was similar to that of double distilled water whose stability was used as reference. The outcomes of the batch experiments and the parameters obtained from Langmuir and Freundlich models indicated that the HAp nanoparticles had a strong affinity for the elimination of Sr²⁺ ions from polluted solutions. These results emphasized that HAp nanoparticles could be excellent candidates in the development of new technologies for water remediation. More than that, the outcomes of the cytotoxic assays proved that HAp nanoparticles did not induce any noticeable harmful effects against HeLa cells and did not affect their proliferation after 1 day and 7 days of incubation. Full article

(This article belongs to the Special Issue New Insights in the Synthesis and Applications of Hydroxyapatite and Composites)

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12 pages, 3771 KiB

Open AccessArticle

Synthesis and Characterization of Calcium Phosphate Materials Derived from Eggshells from Different Poultry with and without the Eggshell Membrane

by Marta Kalbarczyk, Aleksandra Szcześ, Izolda Kantor, Zoltan May and Dariusz Sternik

Materials 2022, 15(3), 934; https://doi.org/10.3390/ma15030934 - 26 Jan 2022

Cited by 7 | Viewed by 3023

Abstract

Calcium phosphate materials such as hydroxyapatite (HA) or tricalcium phosphate (β-TCP) are highly attractive due to their multitude of applications in bone replacement as well as their environmental and ecological credentials. In this research, quail, hen, duck, and pigeon eggshells were used as a calcium source to obtain calcium phosphate materials via the environmentally friendly wet synthesis. Using the eggshells with the organic membrane, the biphasic calcium phosphate materials composed mainly of HA were obtained. The second mineral phase was β-TCP in the case of using quail, hen, and pigeon eggshells and octacalcium phosphate (OCP) in the case of duck eggshells. The HA content in the obtained materials depended on the amount of membrane in the eggshells and decreased in the order of pigeon, duck, hen, and quail eggshells. The eggshell membrane removal from the eggshells caused the reduced content of HA and the presence of the more soluble β-TCP or OCP phase in the obtained materials. The calcium ions release profile in the PBS buffer indicates the potential biomedical application of these materials. Full article

(This article belongs to the Special Issue New Insights in the Synthesis and Applications of Hydroxyapatite and Composites)

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13 pages, 3595 KiB

Open AccessArticle

Solid-State NMR and Raman Spectroscopic Investigation of Fluoride-Substituted Apatites Obtained in Various Thermal Conditions

by Lukasz Pajchel and Leszek Borkowski

Materials 2021, 14(22), 6936; https://doi.org/10.3390/ma14226936 - 16 Nov 2021

Cited by 4 | Viewed by 1645

Abstract

Fluoride-substituted apatites were synthesized by the standard sol-gel method and then calcined at three different temperatures: 800 °C, 1000 °C, and 1200 °C. Using a similar method, hydroxyapatite was synthesized and used as a reference material. The obtained powders were characterized by physicochemical methods: powder X-ray diffractometry, Raman spectroscopy, transmission electron microscopy, and solid-state nuclear magnetic resonance. All these methods allowed to identify additional α-TCP phase (tricalcium phosphate) in the HAP samples heated at 1000 °C and 1200 °C while fluoridated apatites turned out to be thermally stable. Moreover, Raman spectroscopy and NMR allowed to establish that the powders substituted with fluoride ions are not pure fluorapatite and contain OH- groups in the crystal structure. All the obtained materials had crystals with a shape similar to that of biological apatite. Full article

(This article belongs to the Special Issue New Insights in the Synthesis and Applications of Hydroxyapatite and Composites)

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