Synthesis and Characterization of Alumina Nanoparticles: A Case Study

Gautam

et al. 2022

Environ Sci Pollut Res

Herein, we investigated the electrochemical behaviour of fMWCNTs decorated with Co-Nd bimetallic nanoparticles and alumina nanoparticles (Co-Nd/Al 2 O 3 @fMWCNTs). The nanocomposites were synthesised using simple mechanical mixing and characterised by FT-IR, XRD, UV–visible studies, SEM, TEM and EDAX. Moreover, the crystalline size of the synthesised nanoparticles was also calculated using XRD data (Debye–Scherer formula) and was found in the nm range. The electrochemical behaviour of epinephrine (EP) was examined in the presence of Co-Nd/Al 2 O 3 @fMWCNTs nanocomposite modified glassy carbon electrode (GCE) using various electrochemical techniques such as cyclic voltammetry (CV), differential pulse voltammetry (DPV), electrochemical impedance spectroscopy (EIS), and chronocoulometry. Among all the above-mentioned techniques, the DPV response of the modified Co-Nd/Al 2 O 3 @fMWCNTs/GCE under optimal circumstances revealed a dual linear range (0.2 to 4000 µM and 4000 to 14,000 µM) and LOD of 0.015 µM ( S / N = 3). The sensitivities were determined to be 0.00323 µAµM −1 and 0.0004 µAµM −1 in 0.2 to 4000 µM and 4000 to 14,000 µM concentration ranges. Using chronocoulometry, the surface coverage of Co-Nd/Al 2 O 3 @fMWCNTs/GCE was calculated to be 1.37 × 10 −8 mol cm −2 . The fabricated Co-Nd/Al 2 O 3 @fMWCNTs/GCE demonstrated remarkable repeatability, with an RSD of 0.09%, and storage stability of 3 weeks, with 89.6% current retention. Lastly, it was found that Co-Nd/Al 2 O 3 @fMWCNTs/GCE worked well for EP analysis in a variety of biological fluids. Graphical abstract

Section: Resultsmentioning

confidence: 99%

Voltammetric analysis of epinephrine using glassy carbon electrode modified with nanocomposite prepared from Co-Nd bimetallic nanoparticles, alumina nanoparticles and functionalized multiwalled carbon nanotubes

Agrahari

Gautam

et al. 2022

Environ Sci Pollut Res

“…where G is the shear modulus, b is the burger vector, r is the radius of the reinforced particle, and is the interparticle spacing between the matrix and reinforcement. Further, the value can be given by equation (9), where f is the volume fraction of the reinforcement. The schematic illustration of the formation of the bonding between the matrix and reinforcement phase is shown in Figure 12.…”

Section: Densification Behavior Of the Developed Composite Materialsmentioning

confidence: 99%

“…1,2 Ceramic reinforcements like Al 2 O 3 , SiC, BN, TiB 2 , TiC, VC, Si 3 N 4 , Y 2 O 3 , and similar elements are widely engaged for the enhancement in the strength and modulus of aluminum (Al) since the ceramics are harder and have superior thermal stability. [3][4][5][6][7][8][9] The utilization of whiskers in the form of a different oneand two-dimensional structure enhances the material properties significantly. The whiskers hold good thermal, chemical, structural, and tribological stability over other particles when they are used for reinforcement in the metal matrix.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of zinc oxide reinforced aluminum metal matrix composite produced by microwave sintering

Bhoi

Journal of Composite Materials

Pratap

2020

Self Cite

The study focuses on the microstructural, phase transformation, and physical and mechanical aspects of aluminum/zinc oxide composite produced by a hybrid microwave sintering technique. In the present case, zinc oxide nanorods were synthesized through a cost-effective thermal decomposition method. The obtained zinc oxide nanorods’ length was in the range of 76–168 nm observed through high-resolution transmission electron microscopy images and crystallinity nature was confirmed by the bright spot in the selected area electron diffraction pattern. Two different wt% (i.e. 0.5 and 2) of zinc oxide nanorods were utilized for the fabrication of the composite material. The diffraction pattern of the milled powder and energy dispersive spectroscopy results shows effective diffusion of zinc oxide nanorods in the aluminum. The elemental mapping of milled powder illustrates the uniform distribution of the reinforcement over matrix material. The micro-hardness results exhibit a higher hardness of 27.78% with a small fraction of 2 wt%. The nano-indentation results confirm the improvement in the nano-hardness by 32.21% with 2 wt% of zinc oxide with a marginal decrease in elastic modulus by 4.92%.

“…However, the lower wear resistance of Al-based material limits the applicability in the different functional surface. To adlib, the wear resistance properties numerous hard ceramics, oxide-based material is utilized [4]. However, the wear behaviour of the material depends upon the type of application undergoing during the operating environment.…”

Section: Introductionmentioning

confidence: 99%

Reciprocating Wear Behaviour of Al–SiC Composite Processed with MWS

Bhoi

Lecture Notes in Mechanical Engineering

Pratap

2021

Self Cite

The present study involves the fabrication and characterization of Al-SiC composites by means of varying content of SiC (i.e., 5, 10, 15 and 20 wt. %). The material was synthesized with developed hybrid microwave sintering (MWS) technique incorporating powder metallurgy (PM) process. Findings are in good agreement for the selection of reinforcement content in the matrix material for the material development to be used in a lightweight material with improved properties. A systematic approach was made to validate the importance of reinforcement in the matrix material for enhanced product response for various functional applications. The hardness of the developed composite material increases significantly with maximum up to 38.1% for 20 wt.% reinforcement in aluminum. The higher reinforcement percentage in the composite material reduces the wear loss up to 96% as observed in the Al + 20% wt.% SiC composites.