Recent Advances in the Processing and Properties of Alumina–CNT/SiC Nanocomposites

Momohjimoh, Ibrahim; Hussein, M.A.; Al-Aqeeli, N.

doi:10.3390/nano9010086

Cited by 33 publications

(12 citation statements)

References 188 publications

(331 reference statements)

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“…This result was mainly because of the longest exposure to the shear flow and the highest speed of the flow at the near location, which resulted in the separation of the MWCNT mass at the near location and the orientation of the conductive filler in the flow direction. 42 The T-P electrical conductivity of the hybrid composites with both fillers was far higher than that of the composites with only CB by approximately five to six orders of magnitude at three locations; moreover, the T-P electrical conductivity of the hybrid composites continued to increase when the MWCNT content was increased from 2 wt% to 4 wt% (Figure 15). It is believed that the presence of small amounts of MWCNTs may improve the T-P electrical conductivity of the samples.…”

Section: Resultsmentioning

confidence: 99%

Injection-molded lightweight and high electrical conductivity composites with microcellular structure and hybrid fillers

et al. 2019

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Polypropylene/carbon black (PP/CB) and PP/CB/multiwalled carbon nanotube (PP/CB/MWCNT) composites were fabricated by solid and foam injection molding, with the goal of enhancing the electrical conductivity of the composites while decreasing the cost of the final product. The foaming behavior and through-plane (T-P) electrical conductivity of the composites were characterized and analyzed. Cell growth increased the interconnection of the conductive fillers, changed the filler orientation, and enhanced the T-P electrical conductivity of the composites. Under appropriate processing conditions (200°C melt temperature, 70 cm3/s injection flow rate, and 5% void fraction), the T-P electrical conductivity of the foam PP/CB composites was 5 orders of magnitude higher than that of the solid composites (from 5.877 × 10−12 S/m to 1.010 × 10−7 S/m). Moreover, the T-P electrical conductivity values of the PP/CB and PP/CB/MWCNT were compared at the same conductive fillers content (15 wt%). The results showed that the T-P electrical conductivity of the PP/CB/MWCNT composites was far higher than that of the PP/CB composites by almost five orders of magnitude because the MWCNT acted as a bridge between CB particles, and a unique geometric shape was formed in the system. The T-P electrical conductivity of the foam PP/CB/MWCNT composites with 15 wt% carbon fillers was higher than that of the solid PP/CB composites with 20 wt% carbon fillers. This study reveals that the effect of foaming and the addition of hybrid fillers can improve the T-P electrical conductivity of plastic products, which is very important for the development of lightweight conductive plastics.

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Section: Resultsmentioning

confidence: 99%

Injection-molded lightweight and high electrical conductivity composites with microcellular structure and hybrid fillers

et al. 2019

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“…Hence, the utilization of SPS can potentially produce finer grains and smaller pores. Moreover, SPS could facilitate the production of higher-strength materials at lower temperatures compared with hot pressing and conventional sintering [ 45 , 46 ]. The effect of heating rate on the membrane porosity is shown in Figure 5 e,f.…”

Section: Resultsmentioning

confidence: 99%

“…SPS enables higher heating rate, reduced sintering time, and temperature compared to conventional sintering. Moreover, SPS yields higher strength at lower processing temperatures compared to hot pressing [ 45 ] and conventional sintering [ 46 ]. The membrane’s porosity can be manipulated by controlling the SPS temperature [ 47 ].…”

Section: Introductionmentioning

confidence: 99%

Porous Al2O3-CNT Nanocomposite Membrane Produced by Spark Plasma Sintering with Tailored Microstructure and Properties for Water Treatment

et al. 2020

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Ceramic-based nanocomposite membranes are gaining great attention in various applications, such as water treatment; gas separation; oil and gas, amid their superior fouling resistance and remarkable chemical/thermal stability. Here, we report for the first time the use of spark plasma sintering (SPS) process to fabricate a porous alumina–carbon nanotubes (Al2O3–CNT) nanocomposite membrane for water treatment. The challenge is this work is to achieve a balance between the amount of porosity, desired for a high water flux, and the membrane strength level, required to resist the applied pressure during a water flow experiment. The effect of SPS process parameters (pressure, temperature, heating rate, and holding time) on the microstructure and properties of the developed membrane was investigated and correlated. A powder mixture composed of Al2O3 and 5 wt % CNT was prepared with the addition of starch as a pore former and gum Arabic and sodium dodecyl sulfate as dispersants. The powder mixture was then sintered using SPS to produce a solid but porous nanocomposite membrane. The structure and microstructure of the developed membrane were characterized using X-ray diffraction and field emission scanning electron microscopy. The performance of the membrane was assessed in terms of porosity, permeability, and mechanical properties. Moreover, the adsorption capability of the membrane was performed by evaluating its removal efficacy for cadmium (II) from water. The microstructural analysis revealed that CNT were distributed within the alumina matrix and located mainly along the grain boundaries. The permeability and strength were highly influenced by the sintering pressure and temperature, respectively. The results indicated that the membrane sintered at a pressure of 10 MPa, temperature of 1100 °C, holding time of 5 min, and heating rate of 200 °C/min exhibited the best combination of permeability and strength. This developed membrane showed a significant removal efficiency of 97% for cadmium (II) in an aqueous solution.

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“…The source of alumina in ISA is coal powder only, which is used as a facilitating agent for the burning of incense sticks. Alumina micro- and nanoparticles find applications in environmental clean-ups [ 25 ], ceramics [ 26 ], adsorbents [ 27 ], catalysis [ 28 ], and insulating and fire-proof materials [ 24 , 29 ]. Generally, alumina micro- and nanoparticles exhibit transition and metastable phases [ 30 ].…”

Section: Introductionmentioning

confidence: 99%

Utilization of Incense Stick Ash in Hydrometallurgy Methods for Extracting Oxides of Fe, Al, Si, and Ca

Yadav¹,

Gnanamoorthy

Yadav³

et al. 2022

Materials

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With rapid industrialization, there is an ever-increasing demand for iron oxides, calcium oxides, aluminum oxides, silica, and zeolites as raw materials for various industries, but reserves of such metal oxides are continuously diminishing. Therefore, there is an urgent need to explore new alternatives for such value-added minerals. One such material is incense stick ash (ISA), which is among the most unexplored byproducts from residential and holy places. Currently, ISA is of no use and it is disposed of in millions of tons (MTs) in rivers and other water bodies in India due to its sacred value. The major chemical composition of ISA is calcium, silica, alumina, ferrous minerals, magnesium, and traces of Na, K, P, Ti, etc. Major fractions of ISA, i.e., 50–60%, are made up of calcium and magnesium oxides; 20–30% of ISA is made up of silica, alumina, and ferrous minerals, as revealed by X-ray fluorescence spectroscopy (XRF). In the present research work, methods of recovery of value-added micro and nano minerals from ISA are suggested, using cost-effective techniques and an eco-friendly approach. Firstly, magnetic fractions were recovered by a magnetic separation method; then, alumina, silica, and calcium oxides were synthesized from non-magnetic fractions. The confirmation of the synthesized and extracted nanomaterials was done by Fourier transform infrared spectroscopy (FTIR), particle size analyzer (PSA), X-ray diffraction (XRD), field emission scanning electron microscopy with electron diffraction spectroscopy (FESEM-EDS), and transmission electron microscopy (TEM). The purity of synthesized particles varied from 40–80%. In the future, ISA will prove to be an alternative resource material for Fe, Ca, Si, C, Al, and zeolites, which will minimize solid waste pollution and water pollution arising due to the disposal of ISA into water bodies.

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Recent Advances in the Processing and Properties of Alumina–CNT/SiC Nanocomposites

Cited by 33 publications

References 188 publications

Injection-molded lightweight and high electrical conductivity composites with microcellular structure and hybrid fillers

Injection-molded lightweight and high electrical conductivity composites with microcellular structure and hybrid fillers

Porous Al2O3-CNT Nanocomposite Membrane Produced by Spark Plasma Sintering with Tailored Microstructure and Properties for Water Treatment

Utilization of Incense Stick Ash in Hydrometallurgy Methods for Extracting Oxides of Fe, Al, Si, and Ca

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