“…Acidtreated, carboxylated MWCNTs have been used as nucleants for the precipitation of both nano-sized HA [104], and MnO 2 [161], from aqueous salts, before EPD of crack-free coatings. Similarly, CNT/boehmite hybrid powders were prepared using hydrothermal processing to both functionalise the MWCNTs and deposit the inorganic phase (Figure 11(b)) [168].…”
Section: Deposition Of Preassembled Composite Particlesmentioning
confidence: 99%
“…Acid-treated, carboxylated MWCNTs have been used as nucleants for the precipitation of both nano-sized HA [104], and MnO 2 [161], from aqueous salts, before EPD of crack-free coatings. Similarly, CNT/boehmite hybrid powders were prepared using hydrothermal processing to both functionalise the MWCNTs and deposit the inorganic phase (Figure 11(b)) [168]. Figure 11. (a) Schematic representation of the preparation and EPD of CNT/HA composite powders and (b) TEM image of a CNT/boehmite hybrid powder obtained by hydrothermally synthesis showing the coverage of CNTs by fine boehmite particles.…”
Section: Epd Of Cnt-based Nanocompositesmentioning
Electrophoretic deposition (EPD) is a powerful technique to assemble carbon nanotube (CNT) coatings and composite films with controlled architectures. This comprehensive review of the EPD of CNTs and CNT-containing composites focuses on achievements within the last 15 years and ongoing challenges. Stable CNT suspensions are a prerequisite for successful EPD and have been prepared by a variety of strategies, discussed here. The resulting film microstructure is determined by the initial feedstock, the suspension, and the EPD approach applied, as well as a variety of EPD processing parameters. Nanocomposites can be prepared via co-deposition, sequential deposition, or post-deposition treatments, to introduce metallic, ceramic or polymeric phases. There are numerous potential applications for both homogeneous and patterned CNT films, including as structural reinforcements for composites, as field emission, energy storage and conversion devices, as well as in biomedical applications. The advantages and disadvantages of EPD processing in these contexts are discussed.
“…Acidtreated, carboxylated MWCNTs have been used as nucleants for the precipitation of both nano-sized HA [104], and MnO 2 [161], from aqueous salts, before EPD of crack-free coatings. Similarly, CNT/boehmite hybrid powders were prepared using hydrothermal processing to both functionalise the MWCNTs and deposit the inorganic phase (Figure 11(b)) [168].…”
Section: Deposition Of Preassembled Composite Particlesmentioning
confidence: 99%
“…Acid-treated, carboxylated MWCNTs have been used as nucleants for the precipitation of both nano-sized HA [104], and MnO 2 [161], from aqueous salts, before EPD of crack-free coatings. Similarly, CNT/boehmite hybrid powders were prepared using hydrothermal processing to both functionalise the MWCNTs and deposit the inorganic phase (Figure 11(b)) [168]. Figure 11. (a) Schematic representation of the preparation and EPD of CNT/HA composite powders and (b) TEM image of a CNT/boehmite hybrid powder obtained by hydrothermally synthesis showing the coverage of CNTs by fine boehmite particles.…”
Section: Epd Of Cnt-based Nanocompositesmentioning
Electrophoretic deposition (EPD) is a powerful technique to assemble carbon nanotube (CNT) coatings and composite films with controlled architectures. This comprehensive review of the EPD of CNTs and CNT-containing composites focuses on achievements within the last 15 years and ongoing challenges. Stable CNT suspensions are a prerequisite for successful EPD and have been prepared by a variety of strategies, discussed here. The resulting film microstructure is determined by the initial feedstock, the suspension, and the EPD approach applied, as well as a variety of EPD processing parameters. Nanocomposites can be prepared via co-deposition, sequential deposition, or post-deposition treatments, to introduce metallic, ceramic or polymeric phases. There are numerous potential applications for both homogeneous and patterned CNT films, including as structural reinforcements for composites, as field emission, energy storage and conversion devices, as well as in biomedical applications. The advantages and disadvantages of EPD processing in these contexts are discussed.
“…The presence of Al 2 O 3 and Au particles were completely confirmed in the line with the standard patterns. The sample shows the exact same diffraction peaks with lower intensities after impregnation which indicates the retained structure after modification process, and intensities of the peaks became lower with increasing the PEI contents (Zaman et al, 2010;Strunk et al, 2011;Cortes Vega et al, 2017; Figure 2). According to EDS analysis presented in Figure 1, The catalyst has a porous structure which could be in association with the chemical composition of the coat (mostly Al 2 O 3 , ZrO 2 ).…”
A novel CO 2 sorbent was prepared from the catalytic converters of spent automotive exhaust system by modifying with polyethyleneimine (PEI) through wet impregnation method. The prepared sorbent was characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), X-ray diffraction (XRD) and Brauer-Emmett-teller (BET) analysis before and after functionalization. Different PEI loadings were employed to study the adsorption performance of as-prepared sorbent. The characterization results showed no significant change in the structure, but the surface area was decreased after modification with amine groups. The adsorption was remarkably improved by increasing the PEI loading. The optimal PEI loading on the as-prepared sorbent was 60 wt.%. At optimal PEI loading, the CO 2 adsorption reached to 101.3 mg (g sorbent) −1 at 70 • C and partial pressure of 100 kPa. Further PEI loading had a negative effect on the adsorption. The CO 2 adsorption capacity increased to 125.2 mg (g sorbent) −1 in the presence of 1 vol.% of the H 2 O moisture. Results confirmed the high performance of novel sorbent compared to other porous sorbents such as carbon-based materials. Adsorption/desorption cycles revealed that the PEI-impregnated sorbent can be satisfactorily regenerated after CO 2 adsorption process.
“…20). Zaman et al [134] deposited alumina-CNT thin films onto micro pattern moulds prepared using 3D printing. Firstly, micro gears were designed using CAD and created using a 3D printer.…”
Ceramic materials are increasingly used in micro-electro-mechanical systems (MEMS) as they offer many advantages such as high-temperature resistance, high wear resistance, low density, and favourable mechanical and chemical properties at elevated temperature. However, with the emerging of additive manufacturing, the use of ceramics for functional and structural MEMS raises new opportunities and challenges. This paper provides an extensive review of the manufacturing processes used for ceramic-based MEMS, including additive and conventional manufacturing technologies. The review covers the micro-fabrication techniques of ceramics with the focus on their operating principles, main features, and processed materials. Challenges that need to be addressed in applying additive technologies in MEMS include ceramic printing on wafers, post-processing at the micro-level, resolution, and quality control. The paper also sheds light on the new possibilities of ceramic additive micro-fabrication and their potential applications, which indicates a promising future.
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