Formation of bamboo-like nanocarbon and evidence for the quasi-liquid state of nanosized metal particles at moderate temperatures

Li, Yongdan; Chen, Jiuling; Hu, Jiyu; Zhao, Jinbao; Qin, Yiqiao; Liu, Chang

doi:10.1039/a902281c

Cited by 80 publications

(58 citation statements)

References 19 publications

(9 reference statements)

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“…For instance, it is more likely to occur in smaller catalyst particles ( Fig. 11(a) and (b)) as this phenomenon is possibly due to size dependent heat transfer effects of the nano-metal particles as well as the interfacial interactions between the nano-carbon and the nano-metal [33]. This phenomenon was often observed in the reactions over supported Ni-Cu catalysts at above 700°C [61,35], which are normally of smaller particle sizes than those of the unsupported ones.…”

Section: Catalytic Activitymentioning

confidence: 96%

“…The final amounts of carbon produced by methane decomposition at 550, 525 and 500°C were 217 gC/gNi, 282 gC/gNi and 302 gC/gNi respectively. Besides Ni element, supported Ni-Cu catalysts had also been widely studied [22,[32][33][34][35][36][37][38][39] and a great improvement in the stability of the supported Ni-Cu was generally observed when compared with supported Ni catalyst. Cunha et al [30,31] studied the copper effect in Raney-type Ni and Fe catalysts and stated that the formation of encapsulating carbon on nickel or iron can be prevented by ''ensemble control''.…”

Section: Introductionmentioning

confidence: 99%

“…Most of the studies investigated the optimum Ni/Cu ratio [34][35][36][37] which has not been attained due to the different reaction conditions. The occurrence of the quasi-liquid state catalyst was reported to be the main reason for catalyst deactivation under high temperatures [33,35].…”

Section: Introductionmentioning

confidence: 99%

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Methane decomposition using Ni–Cu alloy nano-particle catalysts and catalyst deactivation studies

Wang

Lua

2015

Chemical Engineering Journal

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Section: Catalytic Activitymentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

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Methane decomposition using Ni–Cu alloy nano-particle catalysts and catalyst deactivation studies

Wang

Lua

2015

Chemical Engineering Journal

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“…The thickness of the inner dome walls is always thinner than that of the tube walls. This type of bamboo-like tubes is structurally similar to those frequently obtained by other methods [1], [2], [6], [7], [8], [9] and [10]. However, unlike the previous observations of arc-resulted tubes [1] and [2], the dimensions of the different compartment cavities in an individual tube are not always uniform (Fig.…”

Section: Morphologies and Structures Of Bamboo-shape Cntsmentioning

confidence: 40%

“…Until now, bamboo-shape nanotubes have been fabricated through various processes such as arc-discharge of graphite electrodes [1] and [2], pyrolysis of organometallic compounds [6] and [7], thermal chemical vapor deposition (CVD) [8] and [9], and plasma-enhanced CVD [10], [11], [12] and [13]. Some corresponding growth models have also been proposed [1], [2], [6] and [8].…”

Section: Introductionmentioning

confidence: 99%

Formation of bamboo-shape carbon nanotubes by controlled rapid decomposition of picric acid

Lu¹,

Zhu²,

Su³

et al. 2004

Carbon

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In the presence of catalysts, carbon nanotubes (CNTs) can efficiently grow in the environment generated by the rapid decomposition of normal explosives. Controlling the reaction parameters of a mixture of picric acid (PA) with cobalt acetate and paraffin can lead to a welldefined morphology of CNTs. The formation of bamboo-shape tubes is favorable at relatively high Co(AC) 2 /PA and paraffin/PA ratios. It is found that the bamboo-shape tubes are different in morphology and structure and can be categorized roughly into two types, according to the participation of the catalyst nanoparticles. The formation of the two types is discussed.

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Molecular “Glass” Blowing: From Carbon Nanotubes to Carbon Nanobulbs

Zhu

Schlögl³

et al. 2004

Advanced Materials

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rial has been developed based upon density-functional simulations rather than trial-and-error preparation procedures. In addition, we also expect that materials with N sp above 4.25 will also be good PC materials. This is in excellent agreement with the data compiled in Table 1. In this table we have collected all known phase-change alloys that show good properties in rewritable optical data storage (successful samples') and also two samples that are not suitable. Consistent with the arguments presented above we note from Table 1 that the N sp of successful PC materials is always larger than 4, and usually between 4.3 and 5. From Figure 3, we estimate that the critical value of N sp that distinguishes the rocksalt and the chalcopyrite structures is about 4.1.In summary, the DFT calculations presented here help to identify new and possibly superior phase-change materials. All phase-change materials reported are characterized by a cubic or near-cubic coordination, which is caused by the dominance of the p-electron bonding. The average number of valence electrons plays the crucial role in determining the structure of the semiconductor alloys studied here. For N sp = 4, we find that the stable structure of (Cu,Ag,Au)InTe 2 is the chalcopyrite phase with sp 3 -bonding, while for N sp = 4.5, the stable structure of (Cu,Ag,Au)SbTe 2 ternary alloys is the rocksalt structure with p-bonding. Results show that Te-based ternary materials will favor the suitable rocksalt structure if their N sp is bigger than 4.1. This simple criterion facilitates the search for new phase-change materials and opens the way to a more fundamental understanding of phase-change materials.

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Formation of bamboo-like nanocarbon and evidence for the quasi-liquid state of nanosized metal particles at moderate temperatures

Cited by 80 publications

References 19 publications

Methane decomposition using Ni–Cu alloy nano-particle catalysts and catalyst deactivation studies

Methane decomposition using Ni–Cu alloy nano-particle catalysts and catalyst deactivation studies

Formation of bamboo-shape carbon nanotubes by controlled rapid decomposition of picric acid

Molecular “Glass” Blowing: From Carbon Nanotubes to Carbon Nanobulbs

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