The influence of Si as reactive bonding agent in the electrophoretic coatings of HA–Si–MWCNTs on NiTi alloys

Khalili, Vida; Khalil‐Allafi, Jafar; Maleki-Ghaleh, H.; Paulsen, Alexander; Frenzel, Jan; Eggeler, Gunther

doi:10.1007/s11665-015-1824-3

Cited by 20 publications

(15 citation statements)

References 39 publications

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“…Furthermore, the phase analysis results (XRD patterns) in Figure 2 show the hexagonal structure for HA nanoparticles (JCPDS 09-432). The ZnHA nanoparticles also show a hexagonal structure like HA [35][36][37][38]. At the same time, compositing the ZnHA nanoparticles with rGO nanosheets did not affect the crystal structure, but a new peak associated with graphene nanosheets (002) appeared [39].…”

Section: Characterization Of Nanoparticlesmentioning

confidence: 97%

Antibacterial and Cellular Behaviors of Novel Zinc-Doped Hydroxyapatite/Graphene Nanocomposite for Bone Tissue Engineering

Maleki-Ghaleh

Siadati

Fallah

et al. 2021

IJMS

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Bacteria are one of the significant causes of infection in the body after scaffold implantation. Effective use of nanotechnology to overcome this problem is an exciting and practical solution. Nanoparticles can cause bacterial degradation by the electrostatic interaction with receptors and cell walls. Simultaneously, the incorporation of antibacterial materials such as zinc and graphene in nanoparticles can further enhance bacterial degradation. In the present study, zinc-doped hydroxyapatite/graphene was synthesized and characterized as a nanocomposite material possessing both antibacterial and bioactive properties for bone tissue engineering. After synthesizing the zinc-doped hydroxyapatite nanoparticles using a mechanochemical process, they were composited with reduced graphene oxide. The nanoparticles and nanocomposite samples were extensively investigated by transmission electron microscopy, X-ray diffraction, and Raman spectroscopy. Their antibacterial behaviors against Escherichia coli and Staphylococcus aureus were studied. The antibacterial properties of hydroxyapatite nanoparticles were found to be improved more than 2.7 and 3.4 times after zinc doping and further compositing with graphene, respectively. In vitro cell assessment was investigated by a cell viability test and alkaline phosphatase activity using mesenchymal stem cells, and the results showed that hydroxyapatite nanoparticles in the culture medium, in addition to non-toxicity, led to enhanced proliferation of bone marrow stem cells. Furthermore, zinc doping in combination with graphene significantly increased alkaline phosphatase activity and proliferation of mesenchymal stem cells. The antibacterial activity along with cell biocompatibility/bioactivity of zinc-doped hydroxyapatite/graphene nanocomposite are the highly desirable and suitable biological properties for bone tissue engineering successfully achieved in this work.

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Section: Characterization Of Nanoparticlesmentioning

confidence: 97%

Antibacterial and Cellular Behaviors of Novel Zinc-Doped Hydroxyapatite/Graphene Nanocomposite for Bone Tissue Engineering

Maleki-Ghaleh

Siadati

Fallah

et al. 2021

IJMS

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“…However, the use of dispersing agents can introduce additional considerations of chemical compatibility between the additive and solvent and nonideal behavior in solution, while particular deposition parameters can introduce unfavorable particle-substrate interactions and non-ideal particle behavior in solution. Ultimately, these approaches can limit the maximum achievable yield (Yum et al, 2003;Besra and Liu, 2007;Khalili et al, 2016;Liu et al, 2016;Dhiflaoui et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Chelating Agent Functionalized Substrates for the Formation of Thick Films via Electrophoretic Deposition

et al. 2021

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Incorporating nanoparticles into devices for a wide range of applications often requires the formation of thick films, which is particularly necessary for improving magnetic power storage, microwave properties, and sensor performance. One approach to assembling nanoparticles into films is the use of electrophoretic deposition (EPD). This work seeks to develop methods to increase film thickness and stability in EPD by increasing film-substrate interactions via functionalizing conductive substrates with various chelating agents. Here, we deposited iron oxide nanoparticles onto conductive substrates functionalized with three chelating agents with different functional moieties and differing chelating strengths. We show that increasing chelating strength can increase film-substrate interactions, resulting in thicker films when compared to traditional EPD. Results will also be presented on how the chelating strength relates to film formation as a function of deposition conditions. Yield for EPD is influenced by deposition conditions including applied electric field, particle concentration, and deposition time. This work shows that the functionalization of substrates with chelating agents that coordinate strongly with nanoparticles (phosphonic acid and dopamine) overcome parameters that traditionally hinder the deposition of thicker and more stable films, such as applied electric field and high particle concentration. We show that functionalizing substrates with chelating agents is a promising method to fabricate thick, stable films of nanoparticles deposited via EPD over a larger processing space by increasing film-substrate interactions.

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“…Similarly, introducing the secondary elements, such as Al and Si promoted the electrochemical stability of HA coating due to the formation of some stable phases as well as the density increment after the sintering process. Furthermore, the utilization of carbon nanotubes in the HA coating was studied and highly recommended due to improving the mechanical strength and chemical stability of the matrix . Khalili et al composed the HA coating with MWCNTs and showed that the mechanical strength and electrochemical resistance of the HA coating improved meaningfully after adding the MWCNTs.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, the utilization of carbon nanotubes in the HA coating was studied and highly recommended due to improving the mechanical strength and chemical stability of the matrix . Khalili et al composed the HA coating with MWCNTs and showed that the mechanical strength and electrochemical resistance of the HA coating improved meaningfully after adding the MWCNTs.…”

Section: Introductionmentioning

confidence: 99%

Effect of hydroxyapatite‐titanium‐MWCNTs composite coating fabricated by electrophoretic deposition on corrosion and cellular behavior of NiTi alloy

Maleki-Ghaleh

Khalil‐Allafi

2019

Materials & Corrosion

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In this study, the hydroxyapatite (HA)‐titanium (Ti, 20 wt.%) multiwalled carbon nanotubes (MWCNTs, 1 wt.%) composite coating was applied on the NiTi alloy by using the electrophoretic deposition (EPD) technique. The morphologies and the phase structures of the coatings were investigated by the FESEM and XRD analysis, respectively. The corrosion behaviors of the coated NiTi samples were investigated using the polarization and electrochemical impedance spectroscopy tests in a simulated body fluid (SBF). The amounts of the released Ni ions from the coated NiTi were studied in the SBF. The results of the electrochemical tests revealed the corrosion resistance of the NiTi coated with HA was further improved by the addition of the Ti and MWCNTs to the HA coating. The current density and corrosion resistance of the NiTi alloy changed from 2.52 μA.cm−2 and 24.13 kΩ to 0.91 nA.cm−2 and 5.92 MΩ after coated with the HA‐Ti‐MWCNTs composite coating. Also, the number of nickel ions released from the surface of the NiTi alloy to the SBF medium suppressed from 11.8 to 0.08 μgr.L−1, after coating with HA‐Ti‐MWCNTs. Also, the cellular proliferation in the culture medium consisting of the NiTi alloy coated with the HA‐Ti‐MWCNTs improved significantly (compared with that of the NiTi alloy) as shown no toxicity in the cell culture medium.

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The influence of Si as reactive bonding agent in the electrophoretic coatings of HA–Si–MWCNTs on NiTi alloys

Cited by 20 publications

References 39 publications

Antibacterial and Cellular Behaviors of Novel Zinc-Doped Hydroxyapatite/Graphene Nanocomposite for Bone Tissue Engineering

Antibacterial and Cellular Behaviors of Novel Zinc-Doped Hydroxyapatite/Graphene Nanocomposite for Bone Tissue Engineering

Chelating Agent Functionalized Substrates for the Formation of Thick Films via Electrophoretic Deposition

Effect of hydroxyapatite‐titanium‐MWCNTs composite coating fabricated by electrophoretic deposition on corrosion and cellular behavior of NiTi alloy

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