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Dear Colleagues,

Calcium phosphates are compounds of substantial interest in interdisciplinary fields of science encompassing chemistry, biology, medicine, and geology. Among the calcium phosphates, hydroxyapatite is the most stable, with several practical applications. It is a crucial material for biomedical applications, owing to its excellent biocompatibility, bioactivity, and osteoconductivity. Hydroxyapatite can also be utilized for various environmental applications, including the removal of organic pollutants, quantitative analysis for the detection of pollutants, and photocatalytic degradation. In the biomedical field, both pure and modified hydroxyapatite are utilized in various forms, such as bioceramics, coatings, dental materials, antimicrobial materials, and vehicles for bioactive compounds. We invite you to submit your recent work on hydroxyapatite and its various applications for publication in our Special Issue.

The topics of interest for this Special Issue include, but are not limited to:

the preparation, properties, and applications of hydroxyapatite;
advanced characterization techniques for hydroxyapatite;
functionalized hydroxyapatites and their applications;
doped hydroxyapatites and their applications;
biopolymer/hydroxyapatite nanocomposites;
biological properties of hydroxyapatite;
hydroxyapatite as a vehicle for drugs;
hydroxyapatite and its compounds for bone tissue engineering;
utilization of hydroxyapatite for environmental applications.

Dr. Josy Anteveli Osajima
Dr. Edson C. Silva-Fiho
Dr. Maria Gardennia Fonseca
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Minerals is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Related Special Issue

Published Papers (2 papers)

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Research

15 pages, 3269 KiB

Open AccessArticle

Structural Features of Oxyapatite

by Natalia V. Bulina, Leon A. Avakyan, Svetlana V. Makarova, Igor B. Orehov and Vladimir S. Bystrov

Minerals 2023, 13(1), 102; https://0-doi-org.brum.beds.ac.uk/10.3390/min13010102 - 09 Jan 2023

Cited by 3 | Viewed by 1623

Abstract

One of the most widely known representatives of the apatite family is hydroxyapatite, Ca₁₀(PO₄)₆(OH)₂. This mineral is a part of the human dental and bone tissues, and, therefore, is widely used in medicine. Less known is oxyapatite, Ca₁₀(PO₄)₆O, which has the same biocompatibility as hydroxyapatite. In this work, it is shown that oxyapatite can be obtained by heating hydroxyapatite powder at 1000 °C in vacuum. IR and NMR spectroscopy proved the absence of the hydroxyl groups in the apatite obtained. In the IR spectrum, the presence of new absorption bands of phosphate groups, indicating a symmetry disorder, was observed. Density functional theory modeling confirmed lowering of symmetry for the oxyapatite structure. Modeling the IR spectrum of oxyapatite made it possible to identify the experimentally observed new absorption bands. According to the modeling, the presence of a vacancy in a hydroxyl channel of the apatite structure lowered the symmetry. Powder X-ray diffraction data confirmed that full dehydroxylation of hydroxyapatite led to a decrease in symmetry to triclinic phase. Comparison of the formation energies showed that formation of the hydroxyapatite phase was more preferable than that of oxyapatite, which explains apatite’s tendency to rehydroxylation. It was shown that the solubility of oxyapatite in water was comparable to that of hydroxyapatite. Full article

(This article belongs to the Special Issue Recent Advances of Hydroxyapatite and Its Applications, Volume II)

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11 pages, 3803 KiB

Open AccessArticle

HAp/β-TCP Biphasic Ceramics Obtained by the Pechini Method: An Antibacterial Approach

by Geysivana K. Carvalho, José R. S. Farias, Idglan S. Lima, Ariane M. Nascimento, Gelmires A. Neves, Romualdo Menezes, Josy A. Osajima, Aluska Braga and Edson C. Silva-Filho

Minerals 2022, 12(12), 1482; https://0-doi-org.brum.beds.ac.uk/10.3390/min12121482 - 22 Nov 2022

Cited by 1 | Viewed by 1485

Abstract

Calcium phosphates (CaPs) have broad applications in biomedicine, with the most used phases being hydroxyapatite (HAp) and β-tricalcium phosphate (β-TCP) due to their similarity with natural bone. There are several methods for obtaining CaPs. However, the Pechini method attracts much attention due to its advantages: homogeneous molecular mixing, obtaining nanocrystalline particles, low processing temperature, generating nanometric particles, and simplicity. However, this method is little discussed for the synthesis of CaPs. This work aimed to synthesize CaPs using the Pechini method, analyzing the antibacterial properties. The samples were characterized by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), thermogravimetric analysis (TG/DTG), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS). The XRD confirmed obtaining the biphasic ceramic of HAp, with no other phase as an impurity, where the ratio between citric acid and ethylene glycol (AC/EG) influenced the percentage of HAp phases and β-TCP formed. Thermogravimetric analysis showed a mass loss of approximately 7%. SEM observed the formation of post-agglomerates and irregular shapes. The bacteriological test was satisfactory. The samples showed above 25% inhibition for the growth of Staphylococcus aureus and Escherichia coli bacteria. Full article

(This article belongs to the Special Issue Recent Advances of Hydroxyapatite and Its Applications, Volume II)

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