Electrophoretic deposition of hydroxyapatite submicron particles at high voltages

Mondragón-Cortéz, Pedro; Vargas‐Gutiérrez, G.

doi:10.1016/j.matlet.2003.09.024

Cited by 82 publications

(66 citation statements)

References 19 publications

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“…Homogeneous and crack-free coatings of submicron particles were also obtained in acetone suspensions applying 400-1000 V for 5 s. Many investigations have been conducted to analyse the influence of the electric field on deposition yield and microstructure of HA films obtained by EPD. The use of high voltages has the advantages of faster deposition rates, shorter deposition times and higher deposit thicknesses (Zhitomirsky & Gal-Or 1997;Mondragón-Cortez & Vargas-Gutiérrez 2004). The investigation of HA powders with a wide particle-size distribution showed preferred deposition of smaller particles at lower voltages (Zhitomirsky & Gal-Or 1997).…”

Section: Epd Of Hamentioning

confidence: 99%

Electrophoretic deposition of biomaterials

Boccaccını

Keim

et al. 2010

J. R. Soc. Interface.

613

412

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Electrophoretic deposition (EPD) is attracting increasing attention as an effective technique for the processing of biomaterials, specifically bioactive coatings and biomedical nanostructures. The well-known advantages of EPD for the production of a wide range of microstructures and nanostructures as well as unique and complex material combinations are being exploited, starting from well-dispersed suspensions of biomaterials in particulate form (microsized and nanoscale particles, nanotubes, nanoplatelets). EPD of biological entities such as enzymes, bacteria and cells is also being investigated. The review presents a comprehensive summary and discussion of relevant recent work on EPD describing the specific application of the technique in the processing of several biomaterials, focusing on (i) conventional bioactive (inorganic) coatings, e.g. hydroxyapatite or bioactive glass coatings on orthopaedic implants, and (ii) biomedical nanostructures, including biopolymer-ceramic nanocomposites, carbon nanotube coatings, tissue engineering scaffolds, deposition of proteins and other biological entities for sensors and advanced functional coatings. It is the intention to inform the reader on how EPD has become an important tool in advanced biomaterials processing, as a convenient alternative to conventional methods, and to present the potential of the technique to manipulate and control the deposition of a range of nanomaterials of interest in the biomedical and biotechnology fields.

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Section: Epd Of Hamentioning

confidence: 99%

Electrophoretic deposition of biomaterials

Boccaccını

Keim

et al. 2010

J. R. Soc. Interface.

613

412

View full text Add to dashboard Cite

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“…Under low voltages (<20 V), small HA particles are deposited 29) . Application of higher voltages (>200 V) for periods longer than 10 seconds is reported to deposit bigger HA particles 30) . Increasing the electric field resulted in increased rate of deposition, but the deposited particles had shorter time to rearrange and therefore these coatings had a more porous microstructure 30) .…”

Section: Introductionmentioning

confidence: 99%

“…Application of higher voltages (>200 V) for periods longer than 10 seconds is reported to deposit bigger HA particles 30) . Increasing the electric field resulted in increased rate of deposition, but the deposited particles had shorter time to rearrange and therefore these coatings had a more porous microstructure 30) . Previously, we reported that HA coatings prepared at dynamic voltages consisted of particles with continuous gradient, and that the morphology was distinctly different from that prepared at a constant voltage 19) .…”

Section: Introductionmentioning

confidence: 99%

Hydroxyapatite coating by electrophoretic deposition at dynamic voltage

2008

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The aim of this study was to evaluate hydroxyapatite (HA) coatings produced by dynamic voltage during electrophoretic deposition (EPD). Dynamic voltages from 0 to 200 V were incrementally applied in three interims. The as-deposited coating was sintered at 800°C and its properties evaluated. Structure and phase analyses of both as-deposited and sintered coatings were evaluated by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The HA coatings obtained by dynamic voltage consisted of two layers. While the inner layer was dense and firmly attached to the substrate and contained fine HA particles, the outer layer was porous and contained bigger particles. Repeated deposition was applied to increase the thickness of the coatings. SEM analysis showed that these coatings were free of cracks. In addition, decomposition of HA coatings was not observed until 800°C.

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“…In order to obtain dense, crack-free, well-adherent and low-temperature sinterable coatings, many efforts have been made in previous works [7,14,[17][18][19][20][21] . To obtain perfect coatings, stable suspension is required during the EPD process.…”

Section: Introductionmentioning

confidence: 99%

Electrophoretic coating of Hydroxyapatite on pyrolytic carbon using glycol as dispersion medium

Gao

Lin

2008

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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Hydroxyapatite (HA) coatings on pyrolytic carbon were produced via electrophoretic deposition (EPD) using glycol and ethanol as dispersion medium respectively. The effect of the solubility of HA in the dispersion medium on crack occurrence and adherence of the coating was investigated by means of scanning electronic microscope (SEM) and atomic absorption spectrometer (AAS). The results show that the solubility of HA in glycol is higher than that in ethanol. The usage of glycol as a dispersion medium can reduce the possibility of crack formation and enhance the adhesive strength between the coating and the carbon substrate. The green coatings can be sintered under vacuum at 1 000 ℃ whether the coatings are obtained using ethanol or glycol as dispersion medium. No HA decomposition was observed up to 1 000 ℃ by vacuum sintering by X-ray diffraction (XRD) analysis.

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Electrophoretic deposition of hydroxyapatite submicron particles at high voltages

Cited by 82 publications

References 19 publications

Electrophoretic deposition of biomaterials

Electrophoretic deposition of biomaterials

Hydroxyapatite coating by electrophoretic deposition at dynamic voltage

Electrophoretic coating of Hydroxyapatite on pyrolytic carbon using glycol as dispersion medium

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