Special Issue "Development of Hydroxyapatite Coatings"

A special issue of Coatings (ISSN 2079-6412). This special issue belongs to the section "Surface Coatings for Biomedicine and Bioengineering".

Deadline for manuscript submissions: 5 April 2023 | Viewed by 3164

Special Issue Editor

Dr. Alexandra Ioana Bucur
E-Mail Website
Guest Editor
National Institute for Research-Development in Electrochemistry and Condensed Matter Timisoara, 144 Dr Aurel Paunescu Podeanu, Timisoara 300569, Romania
Interests: nanomaterials; hydroxyapatite synthesis and characterization; ceramics; hydroxyapatite composites with other materials

Special Issue Information

Dear Colleagues,

You are invited to submit a paper to this Special Issue entitled Development of Hydroxyapatite Coatings. This Special Issue aims at gathering information relevant to the field of hydroxyapatite coatings, from their design to their synthesis, characterization, and evaluation and, finally, to potential applications of these coatings in areas other than the medical field.

Hydroxyapatite is a ceramic material with amazing capabilities regarding biointegration and bioactivity. It is synthesizable by many methods, or it can be deposited onto substrates in order to compensate for its low mechanical properties, reduce substrate corrosion or dissolution, or to functionalize the substrate. General applications of this material range from medicine (orthopedics, dentistry) to pharmacy, catalysis, electronics, gas sensors, constructions, and water purification, among others.

The design and production of nanostructured hydroxyapatite coatings offers a large range of functionality and opportunities for composites and structures that can provide a protective effect or functionalize or enhance the properties of existing materials.

The development of hydroxyapatite coatings for mainly medical applications has recently established a high level of knowledge regarding these coatings on both a theoretical and experimental level, so given the large amount of existing studies, this Special Issue will not particularly deal with coatings for this kind of purpose but rather focus on outlining other domains where hydroxyapatite coatings could become useful (though novel findings in this area will not be excluded).

This Special Issue will serve as a forum for papers dealing with the following concepts:

  • Types of hydroxyapatite coatings and substrates used. Coatings of composites of hydroxyapatite and other materials are also welcome.
  • Substrate pretreatment and adherence improvement procedures.
  • Post-treatment procedures and properties that are improved by them
  • Computed modeling of substrate and coating design and performance
  • Methods for coating hydroxyapatite (classic thermal methods and modern/advanced thermal methods, including sputtering deposition, electrochemical and electrophoretic deposition methods, other methods), with emphasis on modern methods
  • Investigation and evaluation of hydroxyapatite coatings (properties, performance, etc.)
  • Applications of hydroxyapatite coatings, with particular emphasis on applications other than the medical field

Dr. Alexandra Ioana Bucur
Guest Editor

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. Coatings 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 2200 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.

Keywords

  • hydroxyapatite coatings
  • computed modeling of coatings
  • substrate pretreatment
  • coating characterization
  • hydroxyapatite coating applications

Published Papers (2 papers)

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Research

Article
Deposition of Fluoresceine-Doped HAp Coatings via High-Velocity Suspension Flame Spraying
Coatings 2022, 12(9), 1251; https://doi.org/10.3390/coatings12091251 - 26 Aug 2022
Viewed by 1439
Abstract
In current medicine, joint revision surgery plays an important role in the treatment of degenerative joint diseases. Infections of the artificial joints are an iatrogenic, accompanying symptom after joint replacement procedures. A new approach is to functionalize the bioactive coatings of the implants [...] Read more.
In current medicine, joint revision surgery plays an important role in the treatment of degenerative joint diseases. Infections of the artificial joints are an iatrogenic, accompanying symptom after joint replacement procedures. A new approach is to functionalize the bioactive coatings of the implants by infiltrating them with anti-inflammatory drugs. This work aims at a one-step approach in manufacturing drug-doped, porous hydroxyapatite coatings by high-velocity suspension flame spraying (HVSFS). Thermal exposure of the temperature-sensitive drugs is critical. Therefore, a new process setup, combining one axial and one radial suspension line, is used for coating deposition. The lower dwell time of the suspension in the flame through radial injection helps in controlling the temperature exposition of the contained drug to the flame. Additionally, the influence of the powder morphology, used as a carrier for the drug in the suspension, is investigated by carrying out spray experiments with suspensions from three different granule types. To analyze the temperature exposition within the coating process, fluoresceine was used as a model drug, as the decomposition of the organic, fluorescing molecules can be easily controlled by fluorescence intensity measurements. It could be shown that the deposition of temperature-sensitive organic molecules is possible without degrading the molecular structure by a modified HVSFS process. This knowledge offers new possibilities in the cost-effective one-step manufacturing of functionalized, anti-inflammatory bioceramic coatings on orthopaedic implants. Full article
(This article belongs to the Special Issue Development of Hydroxyapatite Coatings)
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Article
Simultaneous Precipitation and Electrodeposition of Hydroxyapatite Coatings at Different Temperatures on Various Metal Substrates
Coatings 2022, 12(2), 288; https://doi.org/10.3390/coatings12020288 - 21 Feb 2022
Cited by 6 | Viewed by 1159
Abstract
The coating of orthopedic and dental implants with hydroxyapatite (HA) is recognized as a method to increase their integration ability. A new metal coating method, comprising simultaneous precipitation and electrodeposition, is presented. Two studies are described: the first is related to the influence [...] Read more.
The coating of orthopedic and dental implants with hydroxyapatite (HA) is recognized as a method to increase their integration ability. A new metal coating method, comprising simultaneous precipitation and electrodeposition, is presented. Two studies are described: the first is related to the influence of time/temperature increase on the morpho-structural characteristics of the deposited layer on the Ti substrate, while the second study presents the characteristics of the layers deposited on different metal substrates. For comparison, specimens were obtained using the classical electrochemical deposition under the same experimental conditions. The addition of Ca to the electrolyte creates more compact and more uniform coatings, while the addition of P creates more porous layers. Only a very small quantity of crystalline HA deposited on the C55, Cu, and Ni substrates when the classic electrodeposition method was employed, while using the new approach has clearly led to a larger crystalline HA amount electrodeposited on the same types of metals. With some exceptions, the advantages of using the new method are: better crystallinity, more uniform and continuous surface, higher roughness, and potentially higher anti-corrosion capabilities. Full article
(This article belongs to the Special Issue Development of Hydroxyapatite Coatings)
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