The shape evolution of TiCx prepared by mechanical alloying of Ti-Al-C system after HF treatment

Heidarpour, Akbar; Aghamohammadi, Hamed; Jamshidi, Rasoul; Ghasemi, Samad

doi:10.1016/j.ceramint.2018.11.155

Cited by 18 publications

(12 citation statements)

References 30 publications

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“…The results of this research are in contrast with our previous papers. Our results in previous works indicated that the shape of prepared TiC particles in the Ti‐Al‐C system changed from octahedron to cubic by increasing the immersion time in HF solution 19 . On the other hand, the shape of prepared TiC particles in the Ti‐Si‐C system changed from polyhedron to octahedron shape by increasing the HF treatment times 20 .…”

Section: Resultssupporting

confidence: 52%

“…Our results in previous works indicated that the shape of prepared TiC particles in the Ti-Al-C system changed from octahedron to cubic by increasing the immersion time in HF solution. 19 On the other hand, the shape of prepared TiC particles in the Ti-Si-C system changed from polyhedron to octahedron shape by increasing the HF treatment times. 20 However, in this research, the appearance of the spherical shape of particles after HF treatment is interesting.…”

Section: Discussion Of the Mechanisms Of Shape Evolution Of Ticmentioning

confidence: 99%

“…The shape evolution of TiC mainly was reported with processes at high-temperature reactions. However, our previous works 19,20 indicated that hydrofluoric acid (HF) etching treatment led to the considerable shape evolution of obtained TiC in Ti-Si-C and Ti-Al-C ternary system. The HF treatment can be introduced as a novel, easy, and low-temperature method for the shape controlling of the ceramic materials.…”

Section: Introductionmentioning

confidence: 99%

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Morphological evolution of TiC particles with different stoichiometries by hydrofluoric acid etching treatment

Aghamohammadi

Heidarpour

2021

Int J Applied Ceramic Tech

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The effects of hydrofluoric acid (HF) etching time on the morphology of the titanium carbide (TiC) particles with different stoichiometries were investigated. TiC particles with two C/Ti molar ratios of 0.5 and 1.0 were prepared by mechanical alloying.Then, the powders were immersed in the HF solution for different times of 48, 96, and 142 h. Results showed that the morphology of TiC particles greatly changed after HF etching. In general, a roughing phenomenon was observed as a function of the immersion time in the HF solution. The irregular shape of the TiC particles changed to the spherical shapes by increasing the HF etching time. However, the changing tendency of TiC particles with different stoichiometries was different. The shape of prepared powders with a C/Ti molar ratio of 1.0 was polyhedron at the initial stages of HF treatment, while the shape of prepared powders with a C/Ti molar ratio of 0.5 was near-spherical. However, with increasing the immersion time, the shape of both samples changed to a spherical one. The degree of roughing phenomenon of the prepared powders with a C/Ti molar ratio of 0.5 was lower than that of the prepared powders with a C/Ti molar ratio of 1.0.

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Section: Resultssupporting

confidence: 52%

Section: Discussion Of the Mechanisms Of Shape Evolution Of Ticmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Morphological evolution of TiC particles with different stoichiometries by hydrofluoric acid etching treatment

Aghamohammadi

Heidarpour

2021

Int J Applied Ceramic Tech

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“…As we know, the Debye−Scherrer formula can be used to distinguish between the different sizes of crystallites, where the wider the half-peak width, the smaller the particle size of the corresponding microcrystal. 42 The added amount of 6 mmol (α-MnO 2 -N6) has the smallest particle size as a result. As expected, the addition of Ni(II) can suppress the excessive growth of α-MnO 2 , which has achieved the effect of optimizing the particle size.…”

Section: Resultsmentioning

confidence: 99%

Controlling the Aspect Ratio of α-MnO₂ via the Confined-Space Growth Effect to Enhance the Performance in Aqueous Zinc-Ion Storage

Chen

et al. 2023

ACS Appl. Energy Mater.

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α-MnO 2 nanorods with large 2 × 2 tunnels are often selected as storage materials in aqueous zinc-ion batteries due to their high theoretical capacity, environmental friendliness, and low cost. The electrochemical performance is strongly associated with their particle size; however, many techniques for controlling size include undesirable contents, such as carbon-containing components, which reduce the overall energy density of the electrodes. In this paper, Ni(II) ions are introduced to hinder the spatial growth during the preparation of α-MnO 2 , hence tuning the aspect ratio and enhancing the zinc-ion storage performance. The confinedspace effect is employed by controlling the size of α-MnO 2 particles, in which the initial long rods at the micron scale have become tiny α-MnO 2 nanorods. Smaller particle size electrode materials offer shorter ion diffusion paths, greater electron transport efficiency, and more sufficient solid−liquid interface space due to the small size effect, which also determines the capacity and lifetime of batteries. At the same time, Ni(II) addition selectively hinders the growth direction (001) plane, which effectively shrinks Zn(II) and electron transport paths. As a result, the prepared α-MnO 2 nanorods obtained a high capacity (272 mA h g −1 at 50 mA g −1 ) and stable cycling stability (70% capacity retention after 500 cycles at 500 mA g −1 ). These results demonstrate that the introduction of uncoordinated ions is an effective way to control the metal oxide size and provide a direction in the development of electrode materials for secondary batteries.

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“…It turns out that this transformation may result from the change of the stoichiometric ratio. The corresponding stabilities of the (100) and (111) planes are also changed with the variation of the stoichiometric ratios [108].…”

Section: The Synthesis and Characterization Of Three-dimensional Tmentioning

confidence: 99%

The Synthesis, Structure, Morphology Characterizations and Evolution Mechanisms of Nanosized Titanium Carbides and Their Further Applications

Dong

Qiu

et al. 2019

Nanomaterials

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It is widely known that the special performances and extensive applications of the nanoscale materials are determined by their as-synthesized structures, especially their growth sizes and morphologies. Hereinto, titanium carbides, which show brilliant comprehensive properties, have attracted considerable attention from researchers. How to give full play to their potentials in the light-weight manufacture, microwave absorption, electromagnetic protection, energy conversion and catalyst areas has been widely studied. In this summarized article, the synthesis methods and mechanisms, corresponding growth morphologies of titanium carbides and their further applications were briefly reviewed and analyzed according to their different morphological dimensions, including one-dimensional nanostructures, two-dimensional nanosheets and three-dimensional nanoparticles. It is believed that through the investigation of the crystal structures, synthesis methods, growth mechanisms, and morphology characterizations of those titanium carbides, new lights could be shed on the regulation and control of the ceramic phase specific morphologies to meet with their excellent properties and applications. In addition, the corresponding development prospects and challenges of titanium carbides with various growth morphologies were also summarized.

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The shape evolution of TiCx prepared by mechanical alloying of Ti-Al-C system after HF treatment

Cited by 18 publications

References 30 publications

Morphological evolution of TiC particles with different stoichiometries by hydrofluoric acid etching treatment

Morphological evolution of TiC particles with different stoichiometries by hydrofluoric acid etching treatment

Controlling the Aspect Ratio of α-MnO₂ via the Confined-Space Growth Effect to Enhance the Performance in Aqueous Zinc-Ion Storage

The Synthesis, Structure, Morphology Characterizations and Evolution Mechanisms of Nanosized Titanium Carbides and Their Further Applications

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The shape evolution of TiCx prepared by mechanical alloying of Ti-Al-C system after HF treatment

Cited by 18 publications

References 30 publications

Morphological evolution of TiC particles with different stoichiometries by hydrofluoric acid etching treatment

Morphological evolution of TiC particles with different stoichiometries by hydrofluoric acid etching treatment

Controlling the Aspect Ratio of α-MnO2 via the Confined-Space Growth Effect to Enhance the Performance in Aqueous Zinc-Ion Storage

The Synthesis, Structure, Morphology Characterizations and Evolution Mechanisms of Nanosized Titanium Carbides and Their Further Applications

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Controlling the Aspect Ratio of α-MnO₂ via the Confined-Space Growth Effect to Enhance the Performance in Aqueous Zinc-Ion Storage