Crystal growth mechanism of calcium phosphate coatings on titanium by electrochemical deposition

Mokabber, Taraneh; Lu, Liqiang; Rijn, Patrick van; Vakis, Antonis I.; Pei, Yutao

doi:10.1016/j.surfcoat.2017.12.011

Cited by 49 publications

(50 citation statements)

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“…Therefore, in this study, electrodeposition (which is the transport of ions in a solution by application of an electric current and precipitation of material near the surface of an electrode) was explored, as a new route to promote formation of HAP (rather than other CaP) on the whole marble surface, independently of the crystallographic orientation of the underlying calcite grains. In fact, electrodeposition is currently largely used in the biomedical field to deposit HAP coatings over a wide variety of metallic substrates (typically, titanium and magnesium used as implants for bone regeneration) [13][14][15][16][17][18][19][20][21][22], with no dependence on the substrate crystallographic orientation. Moreover, the mineralogical composition of the electrodeposited coatings can be controlled, by suitably adjusting the process parameters [17,19].…”

Section: Introductionmentioning

confidence: 99%

“…Electrodeposition of HAP, and CaP in general, is based on the idea of coating a conductive material, such as a metal piece, by immersing it in an aqueous solution containing calcium and phosphate precursors, and then to favor CaP formation by applying an electric potential, using the metal piece as the cathode [13]. At the cathode, several electrochemical reactions can take place [18,19,22], which lead to formation of OH − , HPO 4 2− and PO 4 3− ions:…”

Section: Introductionmentioning

confidence: 99%

“…Nature and concentration of the calcium and phosphate salts used as CaP precursors. Typically, Ca(NO 3 ) 2 and (NH 4 )H 2 PO 4 (ADP) are used, with a molar ratio of 10/6 to reproduce the Ca/P atomic ratio in stoichiometric hydroxyapatite [15,[18][19][20][21][22][23][24][25][26][27][28][29][30][31]; • Electrokinetic parameters, namely the electric potential (E) and the current density (i). Typically, these parameters vary in the range E = −1.4 ÷ (−3) V and i = 0.5 ÷ 25 mA/cm 2 [13,14,16,18-25, 29,30,32]; • Possible application of pulsed electric potential.…”

Section: Introductionmentioning

confidence: 99%

“…In this way, OH − ions necessary for HAP formation are obtained with no generation of H 2 bubbles and with consequent improved adhesion of the coating to the substrate [22,32].…”

mentioning

confidence: 99%

“…• 10 vol.% H 2 O 2 . When electrodeposition is adopted, H 2 O 2 is reduced before water, so it can provide the OH − ions necessary for HAP formation without generation of H 2 bubbles[22,31,32], with a consequent benefit in the coating density and adhesion.…”

mentioning

confidence: 99%

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Electrodeposition of Hydroxyapatite Coatings for Marble Protection: Preliminary Results

et al. 2019

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Surface coatings made of hydroxyapatite (HAP) have been proposed to protect marble artworks from dissolution in rain, originated by the aqueous solubility of calcite. However, HAP coatings formed by wet chemistry exhibit incomplete coverage of marble surface, which results in limited protective efficacy. In this study, electrodeposition was explored as a new route to possibly form continuous coatings over the marble surface, leaving no bare areas. Electrodeposition was performed by placing marble samples in poultices containing the electrolyte (an aqueous solution with calcium and phosphate precursors) and the electrodes. The influence of several parameters was investigated, namely the role of the working electrode (cathode or anode), the distance between the marble sample and the working electrode, the deposition conditions (potentiostatic or galvanostatic), the electrolyte composition and concentration, the applied voltage, and time. The coating morphology and composition were assessed by SEM/EDS and FT-IR. The protective ability of the most promising formulations was then evaluated, in all cases comparing electrodeposition with traditional wet synthesis methods. The results of the study suggest that electrodeposition is able to accelerate and improve formation of HAP coatings over the marble surface, even though the obtained protective efficacy is not complete yet.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…In this way, OH − ions necessary for HAP formation are obtained with no generation of H 2 bubbles and with consequent improved adhesion of the coating to the substrate [22,32].…”

mentioning

confidence: 99%

mentioning

confidence: 99%

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Electrodeposition of Hydroxyapatite Coatings for Marble Protection: Preliminary Results

et al. 2019

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Electrochemical Deposited Calcium Phosphate Nanomaterials with Micro‐Nano Interface for Capture and Non‐Invasive Release of Cancer Cells

Zhang

et al. 2021

Adv Materials Inter

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CTCs), which escape from primary tumor and invade into patient peripheral blood circulation system, take major responsibility in cancer metastasis. [2] CTCs contain plenty of information about the primary tumor and the variety of protein molecules at different cancer stage which will help researchers to comprehensively understand and assist to offer more detailed therapeutic schedule. [3] Therefore, CTCs have been regarded as tumor biomarkers and a real-time "liquid biopsy" signal in solid tumors. [4] Isolating CTCs from cancer patients' blood was the first step to research CTCs, which attracted huge attention because the number of CTCs was just one per hundred million of normal blood cells, where large amount of red blood cells and leukocytes exist in primary tumor. [5] It is a challenge to separate the CTCs from normal blood cells and maintain the cells' activity for a follow-up study. Currently, kinds of platforms have been developed for capturing CTCs, including different materials, such as nanoparticles, [6] nanowires, [7] nanotubes, [8] and different methods, such as magnetic separation, [9] flow cytometry, [10] cell size, [11] density gradient sedimentation, [12] and surface electrochemical property. [13] Different micro-structures integrated in microfluidic chips were used to capture and purify CTCs, [14] and enrich heterogeneous CTCs subpopulation. [15] Aptamer had been used widely for modification and precisely recognize target cancer cells. [16] But those methods have their inherent insufficiency, for example, immuno-magnetic bead capture has a weak basis of releasing target cells from magnetic makings, ferromagnetic compounds can shield reflected color of other stuff. Hence it is vital to control the concentration of immunomagnetic bead for further observation in fluorescence analysis. Different levels of damage are caused on cellular film in electrochemical collection where voltage is applied. The prior modification of microfluidic chips is time-consuming and complex, and skillful researcher is needed when applied in clinical test.The size and specific antigen of CTCs are utilized to separate and capture CTCs from patient peripheral blood samples. In addition, the microenvironments of CTCs are also utilized to identify CTCs from normal blood cells. It is reported that the pH range of tumor tissue is 6.2-6.9, which is lower than that in normal organs (7.3-7.4). CTCs and normal cells are dispersed A low cost and easily fabricated 3D micro-nano biocompatible calcium phosphate (CaP) microstructure platform is developed to efficiently capture and non-destructively release cancer cells. The thickness of CaP is ≈3 µm after 2.5 min deposition and increased to ≈12 µm after 10 min deposition. The void size between CaP nanosheets is increased when the electro deposition time is increased. This micro-nano bio-interface is suitable for cancer cell capturing and culturing. More than 90% for the EpCAM positive cells are captured on the CaP substrates where the specific anti-EpCAM antibody is modified. On th...

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Mathematical Modeling of Indentation Process for Layered Sample Taking into Account Plastic Properties of Material Layers

Lyapin

Чебаков

Колосова

et al. 2019

Springer Proceedings in Physics

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Crystal growth mechanism of calcium phosphate coatings on titanium by electrochemical deposition

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Cited by 49 publications

References 37 publications

Electrodeposition of Hydroxyapatite Coatings for Marble Protection: Preliminary Results

Electrodeposition of Hydroxyapatite Coatings for Marble Protection: Preliminary Results

Electrochemical Deposited Calcium Phosphate Nanomaterials with Micro‐Nano Interface for Capture and Non‐Invasive Release of Cancer Cells

Mathematical Modeling of Indentation Process for Layered Sample Taking into Account Plastic Properties of Material Layers

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