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  • 1
    Language: English
    In: Ceramics International, 01 August 2016, Vol.42(10), pp.11876-11888
    Description: Bacterial infection are serious complications for biomedical implants in the orthopedic and dental fields, and the ideal implants should combine good antibacterial ability and bioactivity. In this paper, we have fabricated the strontium/copper substituted hydroxyapatite (SrCuHA) coating on the commercially pure titanium (CP-Ti) and studied their effect on antibacterial and cytocompatible properties. Cu was incorporated into HA in order to improve its antimicrobial properties. Sr was added as a second binary element to improve the biocompatibility. The structural and morphological characteristics of the SrCuHA coatings were investigated using various analytical techniques. The presence of Sr and Cu in solution led to reduced roughness of the coating and finer nucleus size formed. The results highlight that Sr and Cu were homogenously incorporated into HA lattice to form SrCuHA coatings. Inductively coupled plasma mass spectrometry (ICP-MS) was used for the leach out analysis of the samples. A low contact angle value revealed the hydrophilic nature. electrochemical corrosion studies indicated that the SrCuHA coating sustain in the stimulated body-fluid (SBF), exhibiting superior corrosion resistance with a lower corrosion penetration rate than the bare CP-Ti substrate. The SrCuHA coatings can kill to a certain extent during the first few days, which might be due to the Cu substitution in the coating. An enhancement of osteoblast adhesion, proliferation, and alkaline phosphatase activity was observed, which could lead to the optimistic orthopedic and dental applications.
    Keywords: Films ; Corrosion ; Apatite ; Biomedical Applications ; Engineering
    ISSN: 0272-8842
    E-ISSN: 1873-3956
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  • 2
    Language: English
    In: Ceramics International, January 2016, Vol.42(1), pp.1903-1915
    Description: In this study, zinc-doped fluoridated hydroxyapatite (ZnFHA) nano-composite coatings were deposited on the surface of commercially pure titanium (Ti-cp) via electrolytic deposition technique. The phase composition, crystallite size, microstructure, and elemental composition of coated specimens were characterized using different techniques including Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy and energy dispersive X-ray analysis respectively. The influence of coatings on the corrosion behaviour of the specimens was determined by potentiodynamic polarisation in simulated body fluid. In vitro biocompatibility tests, MTT and alkaline phosphatase (ALP) were also employed to assess the cytocompatibility of ZnFHA coating with osteoblast-like MC3T3-E1 cells. Results demonstrated that zinc and fluoride were successfully incorporated into apatite lattice structure. Co-doping of Zn and F ions decreased hydroxyapatite unit cell volume and grain sizes. Obtained coatings were totally crack-free and dense, which led to decrease in corrosion current densities of Ti-cp in physiological solutions. In addition, cytocompatibility tests demonstrated a good osteoblast proliferation and spreading on ZnFHA. More importantly, results showed that the Zn/F-doping can promote ALP expression, which is a probable effect of a combination of nanostructured surface effects and ion release (Zn and F ). Overall, the ZnFHA coated Ti-cp possesses favourable corrosion resistance and cytocompatibility for the application as biomedical implant material.
    Keywords: A. Films ; C. Corrosion ; D. Apatite ; E. Biomedical Applications ; Engineering
    ISSN: 0272-8842
    E-ISSN: 1873-3956
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  • 3
    Language: English
    In: Ceramics International, January 2017, Vol.43(1), pp.992-1007
    Description: Hydroxyapatite (HA)-coated implants are more susceptible to bacterial infection because their bioactive surface, which is favourable for osseointegration, could also become a reservoir for bacterial colonisation. To solve this problem, an electrodeposition method for preparing silver- and strontium-modified antibacterial HA layers onto TiO nanotubes (TNs) was developed. Ag was incorporated into the HA coating to improve its antimicrobial properties. Sr was added as a second binary element to offset the potential cytotoxicity of Ag. Results showed that Sr and Ag could be evenly incorporated into the HA lattice to form SrAgHA coatings. The TN layer with a diameter of 100 nm strengthens the adhesion via the anchoring effect. electrochemical corrosion studies demonstrated that the SrAgHA/TN coating sustains the stimulated body-fluid (SBF), thus indicating excellent corrosion resistance with a lower corrosion penetration rate than the bare commercially pure (CP)-Ti substrate. The composite coatings were found to be bioactive, based on the promotion of additional apatite onto the SrAgHA coating surface from SBF. growth was inhibited by SrAgHA/TN coatings, whereas the coatings without Ag had no effect on bacterial growth. MC3T3-E1 cell culture revealed that SrAgHA/TN demonstrated better cytocompatibility, and permitted stimulated cell proliferation, attachment and differentiation capacities than uncoated CP-Ti substrate. The addition of Sr to the AgHA coatings effectively counteracted the potentially negative effects and improved the performance compared with CP-Ti. The improved antibacterial effects, correlated with superior cytocompatibility and mechanical behaviour, suggested that SrAgHA/TN can be an alternative to pure HA for the preparation of reliable implant coatings for orthopaedic applications.
    Keywords: A. Films ; C. Corrosion ; D. Apatite ; E. Biomedical Applications ; Engineering
    ISSN: 0272-8842
    E-ISSN: 1873-3956
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  • 4
    Language: English
    In: Ceramics International, 01 February 2018, Vol.44(2), pp.1321-1327
    Description: Peapod-like ZnO@C with internal void space has been synthesized by calcination of ZnO/ZnOHF@polydopamine nanorods. By designing both the large void space between particles and external elastic carbon shell, the large volume change of ZnO during charge-discharge process could be effectively relieved. Moreover, the carbon shell functioned as an electronic conductor and elastic barrier, could accelerate the reaction kinetics and confine stable SEI films formation on the outer protective layer to further improve the structural integrity. Benefiting from these structure advantages, the peapod-like ZnO@C presents a prominent electrochemical performance with a retained discharge capacity of 565.1 mA h g at 0.2 A g and high rate capacity of 246.6 mA h g even at 4 A g .
    Keywords: Zno ; Peapod-Like ; Internal Void Space ; Lithium-Ion Battery Anode ; Engineering
    ISSN: 0272-8842
    E-ISSN: 1873-3956
    Source: ScienceDirect Journals (Elsevier)
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  • 5
    Language: English
    In: Ceramics International, 15 April 2019, Vol.45(6), pp.7778-7784
    Description: In our recent work we found γ-AlON:Eu phosphors to hold promise for application in white light-emitting diodes (LEDs). To obtain further insight into Eu –M (M = Mn , Mg , Li ) co-doped γ-AlON, the crystal structure and the electronic and photoluminescence properties of γ-AlON:Eu –M (M = Mn , Mg , Li ) phosphors were studied using first-principle calculations under the framework of density functional theory. Based on the experimental and calculated results, the structure of Eu –M (M = Mn , Mg , Li ) co-doped γ-AlON was established. The calculated results demonstrate that Eu and M (= Mn , Mg , Li ) can effectively improve the absorption of ultraviolet light by γ-AlON:Eu . The absorption coefficient of AlON:Eu –Li in the ultraviolet blue region of 275–415 nm reached 67,266 cm , and the absorption coefficients of AlON:Eu –Mn and AlON: Eu –Mg at the same doping concentration were 51,219 and 60,575 cm , respectively. Our calculations therefore show that the performance of AlON:Eu –Li is better than AlON:Eu –M (M = Mn , Mg ).
    Keywords: Electronic Structure ; First Principles ; Optical Property ; Γ-Alon ; Engineering
    ISSN: 0272-8842
    E-ISSN: 1873-3956
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