Electrochemically-deposited nanostructured Co(OH)2flakes on three-dimensional ordered nickel/silicon microchannel plates for miniature supercapacitors

Nano energetic materials have attracted great attention recently owing to their potential applications for both civilian and military purposes. By introducing silicon microchannel plates (Si-MCPs) three-dimensional (3D)-ordered structures, monocrystalline MnMoO 4 with a size of tens of micrometres and polycrystalline MnMoO 4 nanoflakes are produced on the surface and sidewall of nickel-coated Si-MCP, respectively. The MnMoO 4 crystals ripen controllably forming polycrystalline nanoflakes with lattice fringes of 0.542 nm corresponding to the ( 1 ¯ 11 ) plane on the sidewall. And these MnMoO 4 nanoflakes show apparent thermite performance which is rarely reported and represents MnMoO 4 becoming a new category of energetic materials after nanocrystallization. Additionally, the nanocrystallization mechanism is interpreted by ionic diffusion caused by 3D structure. The results indicate that the Si-MCP is a promising substrate for nanocrystallization of energetic materials such as MnMoO 4 .

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Plasma Spray vs. Electrochemical Deposition: Toward a Better Osteogenic Effect of Hydroxyapatite Coatings on 3D-Printed Titanium Scaffolds

Frontiers in Bioengineering and Biotechnology ◽

10.3389/fbioe.2021.705774 ◽

2021 ◽

Vol 9 ◽

Author(s):

Yang Sun ◽

Xing Zhang ◽

Mingran Luo ◽

Weifan Hu ◽

Li Zheng ◽

...

Keyword(s):

Electrochemical Deposition ◽

Plasma Spray ◽

Bone Repair ◽

Three Dimensional ◽

Repair Capacity ◽

Electrochemically Deposited ◽

3D Printed ◽

Plasma Sprayed

Surface modification of three-dimensional (3D)-printed titanium (Ti) scaffolds with hydroxyapatite (HA) has been a research hotspot in biomedical engineering. However, unlike HA coatings on a plain surface, 3D-printed Ti scaffolds have inherent porous structures that influence the characteristics of HA coatings and osteointegration. In the present study, HA coatings were successfully fabricated on 3D-printed Ti scaffolds using plasma spray and electrochemical deposition, named plasma sprayed HA (PSHA) and electrochemically deposited HA (EDHA), respectively. Compared to EDHA scaffolds, HA coatings on PSHA scaffolds were smooth and continuous. In vitro cell studies confirmed that PSHA scaffolds have better potential to promote bone mesenchymal stem cell adhesion, proliferation, and osteogenic differentiation than EDHA scaffolds in the early and late stages. Moreover, in vivo studies showed that PSHA scaffolds were endowed with superior bone repair capacity. Although the EDHA technology is simpler and more controllable, its limitation due to the crystalline and HA structures needs to be improved in the future. Thus, we believe that plasma spray is a better choice for fabricating HA coatings on implanted scaffolds, which may become a promising method for treating bone defects.

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Anode properties and morphology evolution of three-dimensional lithium-ion battery electrodes comprising Ni-coated Si microchannel plates

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2013.02.115 ◽

2013 ◽

Vol 563 ◽

pp. 186-191 ◽

Cited By ~ 9

Author(s):

Fei Wang ◽

Shanshan Zhu ◽

Mai Li ◽

Xuefeng Lou ◽

Keshuang Hui ◽

...

Keyword(s):

Lithium Ion Battery ◽

Three Dimensional ◽

Lithium Ion ◽

Morphology Evolution ◽

Microchannel Plates

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High-yield synthesis of carbon coils on tungsten substrates and their behavior in the presence of an electric field

Journal of Materials Research ◽

10.1557/jmr.2003.0361 ◽

2003 ◽

Vol 18 (11) ◽

pp. 2580-2587 ◽

Cited By ~ 12

Author(s):

Jun Jiao ◽

Erik Einarsson ◽

David W. Tuggle ◽

Logan Love ◽

Josie Prado ◽

...

Keyword(s):

Electric Field ◽

Field Emission ◽

Current Density ◽

High Current Density ◽

Photon Emission ◽

Three Dimensional ◽

Emission Current Density ◽

High Yield ◽

Ni Catalyst ◽

Electrochemically Deposited

We report an effective procedure for fabricating carbon microcoils and nanocoils with three-dimensional spiral structures in high yield by nickel (Ni)-catalyzed thermal decomposition of acetylene. The Ni catalyst particles used in this preparation were electrochemically deposited onto tungsten substrates. Springlike coils having low pitch and micrometer-scale diameters and ropelike coils having higher pitch and nanometer-scale diameters were observed. Electrical and optical properties were investigated by employing a field-emission probe system equipped with an optical spectrometer. In an applied field above 1.5 V/μm, significant electron emission was observed from individual ropelike nanocoils. The approximately linear slope of the corresponding Fowler-Nordheim plot denotes predominately field-emission behavior. During measurement, individual carbon coils aligned themselves along the electric field, exhibiting a natural resonance on some occasions. As the field strength increased above 2.5 V/μm, the emission-current density for a single nanocoil was measured to be on the order of 104 A/cm2. This high-current density caused Joule heating, resulting in strong photon emission by incandescence.

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