Mechanical Milling Influence on Lattice Vibrational Behaviour of MoO3-V2O5 Composite Nanopowders

Sundeep, Dola; Kumar, T. Vijaya; Kumar, M. Kiran; Krishna, A. Murali; Ravikumar, R.V.S.S.N.

doi:10.1007/s12633-018-9972-3

Cited by 15 publications

(13 citation statements)

References 40 publications

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“…One of the key tools for performing morphological studies on fractured parts are binocular stereomicroscope. [30][31][32][33] From Figure 6 (A-soft alloy and B-superbond), it is clearly shown that stereomicroscopic examination of the group I (100% pure Ni-Cr alloy). From Figure 6 (C-superbond and D-soft alloy) group II (100% recycled Ni-Cr alloy) samples, were considered because superbond has the highest mean bond strength followed by soft alloy, and least for NDN, which revealed alloy-metal oxide disjunction failure.…”

Section: Resultsmentioning

confidence: 97%

A Comparative Assessment of Flexural Bond Strength of Ni–Cr Metal–Ceramic Alloy on Repeated Castings

Jhansi¹,

Reddy²,

Prasad³

et al. 2019

International Journal of Prosthodontics and Restorative Dentistry

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Aim:The present work is aimed to evaluate and compare the metal-ceramic bond strength and clinical feasibility of three commercially available Ni-Cr alloys with different compositions before and after recasting. The hypothesis of this experiment is to evaluate the effect of the recasting of base metal alloys in the physical and chemical properties of alloys, which in turn affect the metal-ceramic bond strength. Materials and methods: In the present experiment, we considered 60 Ni-Cr metal samples, which were divided into group I and group II with every 30 samples. Group I consists of 30 samples fabricated with 100% new alloy, and group II consists of 30 samples fabricated with 100% recycled alloy. Groups I and II are further divided into three subgroups IA, IB, IC and IIA, IIB and IIC on the basis of three brands of Ni-Cr alloy as NDN as (A), soft alloy as (B) and superbond as (C) with each of 10 samples. Metal sprues and buttons obtained after casting of group I samples were used as a recast alloy for the fabrication of group II samples. Results: The flexural bond strength of the fabricated metal-ceramic samples was subjected to three points bending test in a universal testing machine. The obtained values were statistically analyzed using one-way analysis of variance and post hoc Tukey analysis. The morphological studies are the stereomicroscopic examination of all the samples revealed alloy-metal oxide disjunction failure. Conclusion:The mean flexural bond strength for all the groups was above the minimum requirement by American Dental Association (ADA) specification no. 38 and ISO specification 9693. The mean bond strength of group I samples is found to be greater than the group II samples. The soft alloy and superbond have the highest mean bonds when compared among the samples fabricated with 100% new alloy and 100% recycled alloy. Superbond and soft alloy are followed by former and later, and NDN is found to be least for both types. The soft alloy has more reduction in metal-ceramic bond strength in group II (samples fabricated with 100% recycled alloy) when compared to group I.

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Section: Resultsmentioning

confidence: 97%

A Comparative Assessment of Flexural Bond Strength of Ni–Cr Metal–Ceramic Alloy on Repeated Castings

Jhansi¹,

Reddy²,

Prasad³

et al. 2019

International Journal of Prosthodontics and Restorative Dentistry

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“…For all the samples, the asymmetrical stretching vibration of O-Mo-O bonds is responsible for the band at 664 cm −1 [49]. A Raman band located at 819 cm −1 is due to the Mo=O symmetric stretching vibrations.…”

Section: Analysis Of Plal-prepared Sio 2 /Moo 3 Nanocompositementioning

confidence: 90%

Enhancement of catalytic reduction of 4-nitrophenol using MoO₃ nanobelts incorporated SiO₂ nanocomposite fabricated by nanosecond pulsed laser ablation technique

et al. 2023

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Nanocomposites of SiO2/MoO3 having respective weight ratios of 3:1, 2:2, and 1:3 were synthesized using a nanosecond pulsed laser ablation method. The prepared samples were analyzed with UV-Vis and Raman spectroscopy, XRD, SEM, EDX, and TEM. Based on the TEM analysis, the morphology and the structure of the nanocomposites varied with the change in the ratio of MoO3, and the sample containing the highest amount of MoO3 shows a compact morphology and a higher number of nanoparticles. The band gap energy of the nanocomposites increases with an increase in MoO3 load. The nanocomposites were used in the catalytic reduction of 4-nitrophenol (4-NP) in the presence of NaBH4. The reduction time of 4-NP decreases as the amount of MoO3 increases in the nanocomposite. The rate constants were estimated at 0.0878, 0.2319, and 0.1726 min-1 for SiO2/MoO3 (3:1, 2:2, and 1:3) catalysts respectively. The results demonstrate the good catalytic performance of the prepared materials by enabling fast reduction of 4-NP.

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“…The average crystalline size of g-C 3 N 4 , f-MWCNTs/g-C 3 N 4 and f-MWCNTs/g-C 3 N 4 /TiO 2 ternary nanocomposite was calculated by using the Debye-Scherrer's formula [47,48] as in equation (1) and tabulated in table 1. The average crystalline size of g-C 3 N 4 , f-MWCNTs/g-C 3 N 4 and f-MWCNTs/g-C 3 N 4 /TiO 2 ternary nanocomposite is calculated as 8.50, 26.03, and 26.50 nm respectively.…”

Section: Ft-ir Analysismentioning

confidence: 99%

Mechanical and spectroscopic investigation of novel f-MWCNTS/g-C₃N₄/TiO₂ ternary nanocomposite reinforced denture base PMMA

Jhansi,

Sundeep,

Umadevi

et al. 2023

Phys. Scr.

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In the present work, we report the fabrication, spectroscopic and mechanical properties of the novel f-MWCNTS/g-C3N4/TiO2 (MGT-NCs) metal-free ternary nanocomposite reinforced denture base PMMA. The functionalised-MWCNTs were introduced into the graphitic carbon nitride (g-C3N4) nanopowders (NPs). The obtained high porous f-MWCNTS/g-C3N4 NPs were mixed with 10 wt. % of TiO2 NPs previously hydrothermally synthesised. These prepared powders were characterized by XRD, FE-SEM, HR-TEM, FT-IR, and Raman spectroscopy to study the crystal structure and morphology. Using a mechanical blender 2 wt. % of g-C3N4, MWCNT/g-C3N4, and MGT-NCs were sintered into PMMA heat-activated denture base polymer powder and mixed with monomer to fabricate the composites through heat curing. Three different varieties of composites specimens were prepared into flexural, impact, compression, and hardness testing standards. From the comparative assessment of results, it is found that novel MGT-NCs reinforced PMMA exhibited superior mechanical properties. The surface morphology of the fractured and compressed specimens was studied using the SEM analysis and found to have dimples and increased roughness compared to the pristine PMMA and g-C3N4, MWCNT/g-C3N4. Hence, the fabricated novel metal-free MGT-NCs can be used as a reinforcement material in PMMA denture bases to achieve a concurrent enhancement in both physical and mechanical properties.

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Mechanical Milling Influence on Lattice Vibrational Behaviour of MoO3-V2O5 Composite Nanopowders

Cited by 15 publications

References 40 publications

A Comparative Assessment of Flexural Bond Strength of Ni–Cr Metal–Ceramic Alloy on Repeated Castings

A Comparative Assessment of Flexural Bond Strength of Ni–Cr Metal–Ceramic Alloy on Repeated Castings

Enhancement of catalytic reduction of 4-nitrophenol using MoO₃ nanobelts incorporated SiO₂ nanocomposite fabricated by nanosecond pulsed laser ablation technique

Mechanical and spectroscopic investigation of novel f-MWCNTS/g-C₃N₄/TiO₂ ternary nanocomposite reinforced denture base PMMA

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Mechanical Milling Influence on Lattice Vibrational Behaviour of MoO3-V2O5 Composite Nanopowders

Cited by 15 publications

References 40 publications

A Comparative Assessment of Flexural Bond Strength of Ni&ndash;Cr Metal&ndash;Ceramic Alloy on Repeated Castings

A Comparative Assessment of Flexural Bond Strength of Ni&ndash;Cr Metal&ndash;Ceramic Alloy on Repeated Castings

Enhancement of catalytic reduction of 4-nitrophenol using MoO3 nanobelts incorporated SiO2 nanocomposite fabricated by nanosecond pulsed laser ablation technique

Mechanical and spectroscopic investigation of novel f-MWCNTS/g-C3N4/TiO2 ternary nanocomposite reinforced denture base PMMA

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Product

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A Comparative Assessment of Flexural Bond Strength of Ni–Cr Metal–Ceramic Alloy on Repeated Castings

A Comparative Assessment of Flexural Bond Strength of Ni–Cr Metal–Ceramic Alloy on Repeated Castings

Enhancement of catalytic reduction of 4-nitrophenol using MoO₃ nanobelts incorporated SiO₂ nanocomposite fabricated by nanosecond pulsed laser ablation technique

Mechanical and spectroscopic investigation of novel f-MWCNTS/g-C₃N₄/TiO₂ ternary nanocomposite reinforced denture base PMMA