Carbon foams prepared from polyimide using urethane foam template

Inagaki, Michio; Morishita, Takahiro; Kuno, Akitoshi; Kito, Takayuki; Hirano, Masanori; Suwa, Taisuke; Kusakawa, Kouichi

doi:10.1016/j.carbon.2003.12.080

Cited by 164 publications

(54 citation statements)

References 11 publications

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“…8(b)). No noticeable weight loss can be detected above 400 °C, suggesting that most of the PU foam scaffold can be decomposed by calcination at 350 °C in N 2 , in agreement with previous reports [26,29]. The TGA curve of HPCM-2-130 shows a weight loss (11 wt%) at about 270 °C, corresponding to partial decomposition of the PU foam scaffold (Fig.…”

Section: Nano Researchsupporting

confidence: 91%

“…It is found that the original macroporous architecture with its 3-D interconnecting struts is retained during all the steps. The TGA results, similar to previous reports, show that more than 94% of the PU foam can be removed during the carbonization treatment [26,29]. With the increase of the amount of F127 template in the sol solution, the mesostructure phase transforms from body-centered cubic Im m to a 2-D hexagonal p6mm structure.…”

Section: Fabrication Process Of the Hpcm Materialssupporting

confidence: 88%

“…A signifi cant weight loss (60 wt%) is observed at about 385 °C, which is mainly accounted for by the decomposition of triblock copolymer F127 template and PU foam scaffold. A weight loss of 7 wt% in the range 400-900 °C is detected, which may be related to the polymerization of phenolic resins and further decomposition of PU foam [29]. It is reasonable that the PU foam scaffold only decomposes slowly at temperatures above 400 °C, because it is tightly packed with the mesoporous resin coating.…”

Section: Nano Researchmentioning

confidence: 96%

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Facile fabrication of hierarchically porous carbonaceous monoliths with ordered mesostructure via an organic organic self-assembly

2009

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A simple strategy for the synthesis of macro-mesoporous carbonaceous monolith materials has been demonstrated through an organic organic self-assembly at the interface of an organic scaffold such as polyurethane (PU) foam. Hierarchically porous carbonaceous monoliths with cubic (Im m) or hexagonal (p6mm) mesostructure were prepared through evaporation induced self-assembly of the mesostructure on the three-dimensional (3-D) interconnecting struts of the PU foam scaffold. The preparation was carried out by using phenol/formaldehyde resol as a carbon precursor, triblock copolymer F127 as a template for the mesostructure and PU foam as a sacrificial monolithic scaffold. Their hierarchical pore system was macroscopically fabricated with cable-like mesostructured carbonaceous struts. The carbonaceous monoliths exhibit macropores of diameter 100 450 μm, adjustable uniform mesopores (3.8 7.5 nm), high surface areas (200 870 m 2 /g), and large pore volumes (0.17 0.58) cm 3 /g. Compared with the corresponding evaporation induced self-assembly (EISA) process on a planar substrate, this facile process is a time-saving, labor-saving, space-saving, and highly effi cient pathway for mass production of ordered mesoporous materials.

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Section: Nano Researchsupporting

confidence: 91%

Section: Fabrication Process Of the Hpcm Materialssupporting

confidence: 88%

Section: Nano Researchmentioning

confidence: 96%

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Facile fabrication of hierarchically porous carbonaceous monoliths with ordered mesostructure via an organic organic self-assembly

2009

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“…Recently, it has attracted lot of attention owing to outstanding properties such as low density, large surface area with open cell wall structure, good thermal and mechanical stability (Gallego and Klett 2003;Inagaki et al 2004).…”

Section: Introductionmentioning

confidence: 99%

Nickel nanoparticles embedded in carbon foam for improving electromagnetic shielding effectiveness

2014

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To improve electromagnetic shielding effectiveness of light weight carbon foam (CF), magnetic nanoparticles were embedded in it during processing. The CF was developed from the coal tar pitch and mixture of coal tar pitch-Nickel (Ni) nanoparticles by sacrificial template technique and heat treated to up 1,000°C. To ascertain the effect of Ni nanoparticles embedded in CF, it was characterized by scanning electron microscopy, X-ray diffraction, Raman spectroscopy, vector network analyzer and vibration sample magnetometer. It is observed that Ni nanoparticles embedded in the carbon material play an important role for improving the structure and electrical conductivity of CF-Ni by catalytic carbonization. The structural investigation suggests that the Ni nanoparticles embedded in the carbon material in bulk as well on the surface of CF. The CF demonstrates excellent shielding response in the frequency range 8.2-12.4 GHz in which total shielding effectiveness (SE) dominated by absorption losses. The total SE is -25 and -61 dB of CF and CF-Ni, it is governed by absorption losses -48.5 dB in CF-Ni. This increase is due to the increase in dielectric and magnetic losses of ferromagnetic Ni nanoparticles with high surface area. Thus, light weight CF embedded with small amount of magnetic nanoparticles can be useful material for stealth technology.

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“…5 outstanding properties such as low density, large surface area with open cell wall structure, good thermal/electrical transport properties and mechanical stability. 6,7 The CFoams are spongelike high performance engineering materials, in which carbon ligaments are interconnected to each other, and have recently attracted attention due to their potential applications in various elds. 8 The CFoam is generally developed from thermosetting and thermoplastic polymers by various techniques.…”

Section: Introductionmentioning

confidence: 99%

Improved microwave absorption in lightweight resin-based carbon foam by decorating with magnetic and dielectric nanoparticles

et al. 2014

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Carbon foams (CFoams) are sponge-like high performance lightweight engineering materials that possess excellent electrical and mechanical properties as well as thermal stability. CFoams possess bulk density in the range from 0.30 to 0.40 g cm À3 and open porosity of more than 70%. The CFoam consists of pore walls,i.e., ligaments, which are responsible for the conduction path and hence the electrical conductivity due to mobile charge carrier (delocalized p electron), are interconnected to each other. The high value of electrical conductivity causes the CFoam to act as an electromagnetic radiation reflector rather than an absorber;however, in certain applications, shielding materials must be able to absorb the maximum electromagnetic radiation. Therefore, to improve the absorptivity of electromagnetic radiation in

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Carbon foams prepared from polyimide using urethane foam template

Cited by 164 publications

References 11 publications

Facile fabrication of hierarchically porous carbonaceous monoliths with ordered mesostructure via an organic organic self-assembly

Facile fabrication of hierarchically porous carbonaceous monoliths with ordered mesostructure via an organic organic self-assembly

Nickel nanoparticles embedded in carbon foam for improving electromagnetic shielding effectiveness

Improved microwave absorption in lightweight resin-based carbon foam by decorating with magnetic and dielectric nanoparticles

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