Optimum Processing of Absorbable Carbon Nanofiber Reinforced Mg–Zn Composites Based on Two-Level Factorial Design

Tuminoh, Herman; Hermawan, Hendra; Ramlee, Muhammad Hanif

doi:10.3390/met11020278

Cited by 6 publications

(3 citation statements)

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“…Carbon nanofibers (CNF) are one-dimensional materials with typical aspect ratio higher than 100:1, consisting of variously arranged sp 2 -carbon planes . The attractive combination of electrical conductivity, large surface area, and high mechanical strength makes them promising candidates for diverse applications, such as supercapacitor electrodes, − sensors, − adsorbents, − or reinforcement materials. − In the modern age of switching from fossil fuels to green and renewable sources of energy, energy storage applications are one of the most important requirements. However, due to the carbon nature of CNF, their electrochemical capacitance is limited by electrical double layer capacitive mechanism .…”

Section: Introductionmentioning

confidence: 99%

Double-Porous Polyaniline-Based Cryogels with Carbon Nanofibers for Supercapacitors

Milakin,

Tumacder,

Taboubi

et al. 2024

ACS Appl. Energy Mater.

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Polyaniline-poly(N-vinylpyrrolidone) cryogels/aerogels with carbon nanofibers (PANI−CNF−PVP) were prepared by oxidative cryopolymerization of aniline in water:isopropanol medium in the presence of various amounts of dispersed carbon nanofibers (CNF; 0.05−2.5 mg mL −1 ). Scanning electron microscopy showed that all prepared PANI−CNF−PVP and PANI−PVP aerogels have double-porous morphology, which is represented by macropores (5−35 μm), constituting the main threedimensional network of the materials, and smaller pores (≈200 nm − 3 μm) in the macropore walls. The incorporation of CNF into PANI−CNF−PVP aerogels was visualized by scanning and transmission electron microscopy and additionally supported by X-ray photoelectron spectroscopy. Surface area of the aerogels was found to be ≈13−25 m 2 g −1 . Based on full decomposition temperatures determined by TGA, PANI−CNF−PVP aerogels had better thermal stability (792 °C; 2.5 mg mL −1 of CNF) compared to PANI−PVP (750 °C). Starting from the lowest used CNF content (0.05 mg mL −1 ), PANI−CNF−PVP aerogels demonstrated significantly higher gravimetric capacitance (≈3−6 times), compared to PANI−PVP aerogel, reaching 201 F g −1 (1 A g −1 ; 1 mg mL −1 of CNF), in the three-electrode setup. These data were supported by electrochemical impedance spectroscopy, showing lower charge transfer resistance for PANI−CNF−PVP aerogels, which decreased with an increasing CNF fraction. CNF-containing aerogels also showed enhanced cycling stability. A two-electrode symmetrical supercapacitor was assembled using PANI−CNF−PVP aerogel (1 mg mL −1 CNF) as the active electrode material. The device reached a gravimetric capacitance of 213 F g −1 (0.5 A g −1 ) with energy and power densities of 30 Wh kg −1 and 1000 W kg −1 , respectively, and showed 95% cycling stability after 1000 cycles. The performance of this supercapacitor is comparable or often exceeds that of previously reported electrode materials, based on conducting polymers and carbon derivatives. Therefore, the prepared PANI−CNF−PVP aerogels are the promising materials for energy storage.

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Section: Introductionmentioning

confidence: 99%

Double-Porous Polyaniline-Based Cryogels with Carbon Nanofibers for Supercapacitors

Milakin,

Tumacder,

Taboubi

et al. 2024

ACS Appl. Energy Mater.

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“…PM is a technology applied to many metals, such as steel [28][29][30][31], stainless steel [32][33][34], aluminium [35,36], copper [37], titanium [38][39][40][41], and magnesium [42,43], etc. Metal powders can be pre-alloyed [44,45] or mechanically alloyed [34,46]; it depends on the application sought.…”

Section: Introductionmentioning

confidence: 99%

One-Step Enameling and Sintering of Low-Carbon Steels

Martínez

Abenójar

Bahrami

et al. 2021

Metals

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Powder technology allows manufacturing complex components with small tolerances, saving material without subsequent machining. There is a growing trend in using sintered steel components in the automotive industry. Within 2020, about 2544 million US dollars was invested for manufacturing sintered components. Not only does this industry uses steel components, but the gas cooker industry also uses steel in its burners since they are robust and usually demanded by Americans, with forecasts of 1097 million gas cookers in 2020. Steel gas burners have a ceramic coating on their surface, which means that the burner is manufactured in two stages (casting and enameling). This work aims to manufacture the gas burners by powder metallurgy, enameling and sintering processes in a single step. To achieve this aim, the ASC100.29 iron powder has been characterized (flow rate, relative density and morphology); subsequently, the most suitable parameters for its compaction and an adequate sintering temperature were studied. Single-step sintering and enameling was achieved by compacting iron powder at 500 MPa and sintering at 850 °C for 5 min. The necessary porosity for mechanical anchoring of the coating to the substrate is achieved at this sintering temperature. Bending resistance tests, scratching, degradation under high temperature and basic solution and scanning electron microscopy were used to characterize and validate the obtained samples.

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“…In addition, the amorphous alloys showed excellent mechanical properties and corrosion resistance. Tuminoh et al [3] studied new absorbable materials for biomedical applications made of CNF-reinforced Mg-Zn composites, finding the optimum process parameters to obtain a high elastic modulus, hardness, and degradation resistance. The interest to reduce the elastic modulus has encouraged the research also on the development of β-type titanium alloys, adding specific amounts of β stabilisers, characterised by a higher corrosion resistance and mechanical properties than α-type and α + β-type Ti alloys.…”

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confidence: 99%