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79 results for “Hydroxyapatite”
Removal of Aqueous Uranyl and Arsenate Mixtures by Natural Limestone and Hydroxyapatite Precipitates, Rio Paguate, NM, 2022-2023
This dataset documents a series of laboratory batch experiments investigating the removal of aqueous uranyl (U) and arsenate (As) mixtures using natural limestone and precipitated hydroxyapatite (HAp, Ca₁₀(PO₄)₆(OH)₂) as reactive materials. The main objective of the study was to address the challenge of simultaneous removal of uranyl cations and arsenate oxyanions by using mineral-based adsorbents, such as limestone. The precipitation of HAp enhanced As removal while maintaining high uranium immobilization efficiency.The archived data include measurements of aqueous U and As at trace-level concentrations under varying experimental conditions, including pH (ranging from 7 to 11), initial contaminant concentrations (0.05–1 mM), and the addition of calcium (Ca²⁺) and phosphate (PO₄³⁻) to promote HAp precipitation. Experiments were conducted in triplicate to ensure reproducibility, and solid-phase characterization data (from pXRD, SEM/EDX, and electron microprobe analysis) are also included to support the interpretation of removal mechanisms. A key finding revealed from the data is that near-complete removal of U (>97%) with As removal between 30 and 98% were achieved under pH conditions around 9. This dataset provides a comprehensive record of solution chemistry and treatment performance, serving as a fundamental resource for evaluating the effectiveness of natural mineral-based approaches for remediating co-contaminated waters.
Figures - Vat photopolymerization of biomimetic bone scaffolds based on Mg, Sr, Zn-substituted hydroxyapatite: Effect of sintering temperature
<p>Figures of publication "<span>Vat photopolymerization of biomimetic bone scaffolds based on Mg, Sr, Zn-substituted hydroxyapatite: Effect of sintering temperature</span>".</p> <p><a title="Persistent link using digital object identifier" href="https://doi.org/10.1016/j.ceramint.2024.05.038" target="_blank" rel="noreferrer noopener"><span><span>https://doi.org/10.1016/j.ceramint.2024.05.038</span></span></a></p>
Electrodeposited hydroxyapatite coating of titanium after ultrashort-pulsed lasers processing
<p></p> <p class="MsoNormal">The dataset presents surfaces features of<span> electrodeposited hydroxyapatite coating on titanium </span><span>modify </span><span>with ultrashort-pulsed lasers. </span></p> <p class="MsoNormal"><span>Four different hydroxyapatite coatings are created (A-D). Every coating is conditioned with four different laser irradiations 1-4 to 4-4 carried out in different parameter settings with altered power, velocity, and frequency. The surface features of laser-irradiated coating are presented. </span></p> <p class="MsoNormal"> </p>
(VIDEOS) Dynamics of hydroxyapatite and carbon nanotubes interacting
<p>These files correspond to the dynamics results for all the structures studied in the paper:</p> <ul> <li>W.G. Knupp, M.S. Ribeiro, M. Mir, I. Camps. <em>Dynamics of hydroxyapatite and carbon nanotubes interaction</em>. Applied Surface Science 495 (2019) 143493. DOI: <a href="https://doi.org/10.1016/j.apsusc.2019.07.235">10.1016/j.apsusc.2019.07.235</a></li> </ul> <p>The nomenclature to identify the systems is:</p> <ul> <li>HAP, for hydroxyapatite.</li> <li>CNT, for pristine carbon nanotube.</li> <li>HAP+CNT, for the complex hydroxyapatite interacting with pristine carbon nanotube.</li> <li>HAP+CNTOHx, for hydroxyapatite interacting with -OH functionalized carbon nanotube.</li> <li>HAP+CNTCOOHx, for hydroxyapatite interacting with -COOH functionalized carbon nanotube.</li> <li>x = 5%, 10%, 15%, 20%, 25% represents the concentration of -OH or -COOH, respectively.</li> </ul>
Data from: Passive sampling of environmental DNA in aquatic environments using 3D-printed hydroxyapatite samplers
<p>The study of environmental DNA released by aquatic organisms in their habitat offers a fast, non-invasive and sensitive approach to monitor their presence. Common eDNA sampling methods such as water filtration and DNA precipitation are time consuming, require difficult-to-handle equipment and partially integrate eDNA signals. To overcome these limitations, we created the first proof of concept of a passive, 3D-printed and easy-to-use eDNA sampler. We designed the samplers from hydroxyapatite (HAp samplers), a natural mineral with a high DNA adsorption capacity. The porous structure and shape of the samplers were designed to optimise DNA adsorption and facilitate their handling in the laboratory and in the field. Here we show that HAp samplers can efficiently collect genomic DNA in controlled set-ups, but can also collect animal eDNA under controlled and natural conditions with yields similar to conventional methods. However, we also observed large variations in the amount of DNA collected even under controlled conditions. A better understanding of the DNA-hydroxyapatite interactions on the surface of the samplers is now necessary to optimise the eDNA adsorption and to allow the development of a reliable, easy-to-use and reusable eDNA sampling tool.</p>
Investigating the Effects of Laser Wavelengths and Other Ablation Parameters on the Detection of Biogenic Elements and Contaminants in Hydroxyapatite - JAAS - Dataset
<p>The dataset provided contains measurements for an article in The Journal of Analytical Atomic Spectrometry (JAAS). Further details are available in the .txt file included in the folder.</p>
Stl. and nTopology program file of the scaffold used in publication "Vat photopolymerization of biomimetic bone scaffolds based on Mg, Sr, Zn-substituted hydroxyapatite: Effect of sintering temperature"
<p>Stl. nTopology program file of the scaffold used in <a title="Persistent link using digital object identifier" href="https://doi.org/10.1016/j.ceramint.2024.05.038" target="_blank" rel="noreferrer noopener">https://doi.org/10.1016/j.ceramint.2024.05.038</a></p>
Ions release from hydroxyapatite and substituted hydroxyapatites in different immersion liquids: In vitro experiments and theoretical modelling study
<p>The multi-substituted hydroxyapatites (ms-HAPs) are currently gaining more consideration due to their multifunctional properties and biomimetic structure, owning thus an enhanced biological potential in orthopedic and dental applications. In this study, nano hydroxyapatite (HAP) substituted with multiple cations (Sr2+, Mg2+ and Zn2+) for Ca2+ and anion (SiO44-) for PO43- and OH-, specifically HAPc-5%Sr and HAPc-10%Sr (where HAPc is HAP-1.5%Mg-0.2%Zn-0.2%Si), both lyophilized noncalcined and lyophilized calcined, were evaluated for their in vitro ions release. These nanomaterials were characterized by SEM, FE-SEM and EDX, as well as by AFM images and by surface-specific areas and porosity. Further, the release of cations and of phosphate anions were assessed from nano HAP and ms-HAPs, both in water and in simulated body fluid (SBF), in static and simulated dynamic conditions, using inductively coupled plasma optical emission spectrometry (ICP-OES). The release profiles were analyzed and the influence of experimental conditions was determined for each of the six nanomaterials and for various periods of time. The pH of the samples soaked in the immersion liquids was also measured. The ions release mechanism was theoretically investigated using the Korsmeyer-Peppas model. The results indicated a mechanism principally based on diffusion and dissolution, with possible contribution of ion exchange. The surface of ms-HAP nanoparticles is more susceptible to dissolution into immersion liquids due to the lattice strain provoked by simultaneous multi-substitution in HAP structure. According to the findings, it is rational to suggest that both materials HAPc-5%Sr and HAPc-10%Sr are bioactive and can be potential candidates in bone tissue regeneration.</p>
Effects of a Hydroxyapatite-based Mouth Gel on Calcium Content of Plaque
ClinicalTrials.gov study NCT03956992. IPD Sharing: NO. Countries: 1. Publications: 1.
Open Sinus Lift Technique With Simultaneous Implantation Using Platelet Rich Fibrin (PRF) Versus Nano-crystalline Hydroxyapatite
ClinicalTrials.gov study NCT02577289. IPD Sharing: Not stated. Countries: 1. Publications: 24.
Hyaluronic Acid +Hydroxyapatite Vs Hydroxyapatite in Bone Regeneration
ClinicalTrials.gov study NCT05957926. IPD Sharing: NO. Countries: 1. Publications: 3.
Remineralization Effects of Hydroxyapatite Toothpaste
ClinicalTrials.gov study NCT03681340. IPD Sharing: NO. Countries: 1. Publications: 1.
Hydroxyapatite-toothpaste and Enamel Caries in the Primary Dentition
ClinicalTrials.gov study NCT03553966. IPD Sharing: NO. Countries: 1. Publications: 14.
Ca-hydroxyapatite, Fluoroapatite, and Mg-Zn-hydroxyapatite for Dentin Hypersensitivity Management
ClinicalTrials.gov study NCT04896294. IPD Sharing: UNDECIDED. Countries: 1. Publications: 5.
Evaluation, the Histomorphometric Study of Nanocrystalline Hydroxyapatite (Nano Bone) Wif Lovastatin in the Preservation of the Tooth Socket
ClinicalTrials.gov study NCT03981601. IPD Sharing: NO. Countries: 1. Publications: 0.
In Vivo Clinical Trial of Porous Starch - Hydroxyapatite Composite Biomaterials for Bone Regeneration
ClinicalTrials.gov study NCT02910232. IPD Sharing: YES. Countries: 1. Publications: 3.
Nano-hydroxyapatite With Potassium Nitrate in the Therapy of the Dental Sensitivity
ClinicalTrials.gov study NCT02895321. IPD Sharing: NO. Countries: 1. Publications: 4.
Evaluation of Nano-crystalline Hydroxyapatite Silica Gel in Management of Periodontal Intrabony Defects
ClinicalTrials.gov study NCT02507596. IPD Sharing: Not stated. Countries: 1. Publications: 3.
Caries-preventing Effect of a Hydroxyapatite-toothpaste in Adults
ClinicalTrials.gov study NCT04756557. IPD Sharing: NO. Countries: 1. Publications: 9.
Comparison Synthetic Hydroxyapatite and Inorganic Bovine Bone in Sinus Floor Elevation
ClinicalTrials.gov study NCT03077867. IPD Sharing: NO. Countries: 1. Publications: 2.
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