Search results for: Cailu Xu

Items from 1 to 20 out of 51 results

article

Preparation of copper nanoparticles on carbon nanotubes by electroless plating method

Cailu Xu, Gongwei Wu, Zheng Liu, Dehai Wu, more

Materials Research Bulletin > 2004 > 39 > 10 > 1499-1505

Densely distributed copper nanoparticles have been deposited on the surface of carbon nanotubes with a size of ~10nm by the electroless plating method. It has been found that the pretreatment of the carbon nanotubes is very important to obtain the copper nanoparticles on the carbon nanotubes; in our experiments, one-step pretreatment of mixed HNO ₃ and H ₂ SO ₄ was found effective...

article

Measuring hydrogen storage capacity of carbon nanotubes by tangent-mass method

Xuesong Li, Hongwei Zhu, Cailu Xu, Zongqiang Mao, more

International Journal of Hydrogen Energy > 2003 > 28 > 11 > 1251-1253

The tangent-mass method is introduced to measure and calculate hydrogen storage capacity of carbon nanotubes by using a high-pressure microbalance. This method can effectively calibrate the effect of buoyancy and conveniently determine the adsorption isotherm. Single-walled carbon nanotubes were measured by this method to provide reference data for future studies.

article

Structure and superconductivity of MgB ₂ -carbon nanotube composites

Jinquan Wei, Yanhui Li, Cailu Xu, Bingqing Wei, more

Materials Chemistry and Physics > 2003 > 78 > 3 > 785-790

It has been reported that MgB ₂ lost its superconductivity when doped with 40at.% Al. Here, we report on the influence of carbon nanotubes (CNTs) on the structure and superconductivity of MgB ₂ -CNTs composites. The lattice parameters of MgB ₂ with 10at.% CNTs are a=0.30815nm and c=0.35322nm, slightly different from those of the pure MgB ₂ , which indicates that carbon...

article

Hydrogen storage in heat-treated carbon nanofibers prepared by the vertical floating catalyst method

Hongwei Zhu, Xuesong Li, Lijie Ci, Cailu Xu, more

Materials Chemistry and Physics > 2003 > 78 > 3 > 670-675

Hydrogen storage in carbon nanofibers (CNFs) prepared by the floating catalyst method is investigated. The pristine CNF materials are subjected to several heat treatments under different temperatures with the protection of Ar for 2h to get favorable structure and adsorption surface. These treatments improved the graphitization degree and surface activity of the CNFs effectively. At last these materials...

article

Adsorption of fluoride from water by aligned carbon nanotubes

Yan-Hui Li, Shuguang Wang, Xianfeng Zhang, Jinquan Wei, more

Materials Research Bulletin > 2003 > 38 > 3 > 469-476

Aligned carbon nanotubes (ACNTs), a new type of carbon material, were prepared by catalytic decomposition of xylene using ferrocene as catalyst. The kinetics experiment of ACNTs shows that fluoride adsorption rate is fast in the first 60min and the adsorption capacity reaches 3.0mg/g rapidly, then it decreases and adsorption achieves equilibrium gradually in about 180min. The fluoride adsorption of...

article

Annealing amorphous carbon nanotubes for their application in hydrogen storage

Lijie Ci, Hongwei Zhu, Bingqing Wei, Cailu Xu, more

Applied Surface Science > 2003 > 205 > 1-4 > 39-43

Carbon nanotubes with poor crystallization degree were mass-produced by the floating catalyst method, and their crystallizing procedure at high annealing temperatures were investigated. The crystallization behavior is different from that of bulk amorphous carbons due to the finite dimensions and tube-like shape of the as-grown carbon nanotubes. Further hydrogen adsorption experiments showed that the...

article

Surface characteristics of modified carbon nanotubes and its application in lead adsorption from aqueous solution

Shuguang Wang, Yanhui Li, Gong Xiaoyan, Huazhang Zhao, more

Chinese Science Bulletin > 2003 > 48 > 5 > 441-443

Carbon nanotubes (CNT) were modified by nitric acid oxidation. Infrared spectroscopy (IR) demonstrated that hydroxyl (-OH) and carbonyl (-C=O) functional groups were introduced to the surface of modified CNT. Micrometrics ASAP 2000 measurement showed that the surface area of modified CNT was slightly increased. Furthermore, the Pb²⁺ adsorption behavior on the surface of modified CNT has been investigated...

article

Electrochemical hydrogen storage of aligned multiwalled carbon nanotubes

Donghui Hao, Hongwei Zhu, Xianfeng Zhang, Yanhui Li, more

Chinese Science Bulletin > 2003 > 48 > 6 > 538-542

Hydrogen storage of aligned multi-walled carbon nanotubes (a-MWNTs), non-aligned MWNTs (n-MWNTs) and graphite electrodes are studied by the electrochemical measurements. The electrodes are prepared by mixing carbon nanotubes (CNTs), copper powder and PTFE binder in a weight ratio of 1: 5: 3 and compressing the mixture into porous nickel collector. The results show that the electrochemical hydrogen...

article

Synthesis of carbon nanotubes with Ni/CNTs catalyst

Chunhua Li, Kefu Yao, Dianbo Ruan, Ji Liang, more

Science China Technological Sciences > 2003 > 46 > 3 > 303-308

Carbon nanotubes (CNTs), owing to their large specific area, good chemical stability and modifiable surface properties after acidic or basic treatment, can be used as catalytic support materials. In this paper, the activities and selectivities of two catalysts, i. e. Ni catalyst supported by carbon nanotubes (Ni/CNTs) and that supported by diatomite (Ni/SiO₂), are compared. It is found that the quality...

article

Competitive adsorption of Pb ² ⁺ , Cu ² ⁺ and Cd ² ⁺ ions from aqueous solutions by multiwalled carbon nanotubes

Yan-Hui Li, Jun Ding, Zhaokun Luan, Zechao Di, more

Carbon > 2003 > 41 > 14 > 2787-2792

The individual and competitive adsorption capacities of Pb ² ⁺ , Cu ² ⁺ and Cd ² ⁺ by nitric acid treated multiwalled carbon nanotubes (CNTs) were studied. The maximum sorption capacities calculated by applying the Langmuir equation to single ion adsorption isotherms were 97.08 mg/g for Pb ² ⁺ , 24.49 mg/g for Cu ² ⁺ and 10.86 mg/g for Cd...

article

High-yield synthesis of multi-walled carbon nanotubes by water-protected arc discharge method

Xuesong Li, Hongwei Zhu, Bin Jiang, Jun Ding, more

Carbon > 2003 > 41 > 8 > 1664-1666

article

Adsorption of cadmium(II) from aqueous solution by surface oxidized carbon nanotubes

Yan-Hui Li, Shuguang Wang, Zhaokun Luan, Jun Ding, more

Carbon > 2003 > 41 > 5 > 1057-1062

Carbon nanotubes (CNTs) were oxidized with H ₂ O ₂ , KMnO ₄ and HNO ₃ . Their physicochemical properties were investigated by BET N ₂ adsorption, laser particle examination, Boehm's titration, zeta potential measurement and cadmium(II) adsorption. The experimental results suggest that cadmium(II) adsorption capacities for three kinds of oxidized CNTs increase...

article

Hydrogen storage by platelet-carbon fibers at room temperature

Hongwei Zhu, Chunhua Li, Xuesong Li, Cailu Xu, more

Materials Letters > 2002 > 57 > 1 > 32-35

In this work, the performance of hydrogen uptake by one special kind of carbon fibers (platelet-vapor grown carbon fibers (VGCFs)) was investigated. The pristine materials are submitted to hydrogen storage without any further treatments. The results show that these materials can absorb ~4 wt.% of hydrogen at room temperature under ~9 MPa. The effect of the platelet structure on the adsorption performance...

article

Mechanical and electrical properties of carbon nanotube ribbons

Yan-Hui Li, Jinquan Wei, Xianfeng Zhang, Cailu Xu, more

Chemical Physics Letters > 2002 > 365 > 1-2 > 95-100

We have measured the Young's modulus of long aligned carbon nanotube ribbons using a special stress-strain puller designed for whisker-like materials. The Young's modulus of the graphitized carbon nanotube ribbons is about 60 GPa, which is 2.5 times higher than that of the as-grown ribbons. This suggests that the graphitization is an effective way to improve the mechanical properties of the ribbons...

article

Structural Characterizations of Long Single-Walled Carbon Nanotube Strands

Wei, Robert Vajtai, Yoon Young Choi, Pulickel M. Ajayan, more

Nano Letters > 2002 > 2 > 10 > 1105 - 1107

article

A new method for synthesizing double-walled carbon nanotubes

Hongwei Zhu, Cailu Xu, Bingqing Wei, Dehai Wu

Carbon > 2002 > 40 > 11 > 2023-2025

article

Rapid growth of well-aligned carbon nanotube arrays

Xianfeng Zhang, Anyuan Cao, Bingqing Wei, Yanhui Li, more

Chemical Physics Letters > 2002 > 362 > 3-4 > 285-290

Vertically aligned carbon nanotube (CNT) arrays with high density were synthesized on quartz substrates in large areas (100x40mm ² ) by catalytic decomposition of a ferrocene-xylene mixture at 850 ^o C in a quartz tube reactor. The nanotubes grow at a high growth rate of ~50μm/min, and reach 1.5 mm in length in 30 min. Scanning electron microscopy (SEM) and transmission electron microscopy...

article

Hydrogen Uptake in Boron Nitride Nanotubes at Room Temperature

Renzhi Ma, Yoshio Bando, Hongwei Zhu, Tadao Sato, more

Journal of the American Chemical Society > 2002 > 124 > 26 > 7672 - 7673

article

Growth mechanism of Y-junction carbon nanotubes

Hongwei Zhu, Lijie Ci, Cailu Xu, Ji Liang, more

Diamond & Related Materials > 2002 > 11 > 7 > 1349-1352

The growth mechanism of Y-junction carbon nanotubes (CNTs) prepared by floating catalyst method has been investigated by transmission electron microscopy (TEM). The branch of Y-junction CNT is much shorter than the stem CNT, and the trace of metal particle is observed clearly along the branch carbon nanotube. We present several evidences for a metal particle catalytic growth mechanism. A simple growth...

article

Lead adsorption on carbon nanotubes

Yan-Hui Li, Shuguang Wang, Jinquan Wei, Xianfeng Zhang, more

Chemical Physics Letters > 2002 > 357 > 3-4 > 263-266

Carbon nanotubes (CTNs) show exceptional adsorption capability and high adsorption efficiency for lead removal from water. The adsorption is significantly influenced by the pH value of the solution and the nanotube surface status, which can be controlled by their treatment processing. The adsorption isotherms are well described by both Langmuir and Freundlich models. Our results suggest that CNTs...

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INFONA - science communication portal

Search results for: Cailu Xu

Preparation of copper nanoparticles on carbon nanotubes by electroless plating method

Measuring hydrogen storage capacity of carbon nanotubes by tangent-mass method

Structure and superconductivity of MgB ₂ -carbon nanotube composites

Hydrogen storage in heat-treated carbon nanofibers prepared by the vertical floating catalyst method

Adsorption of fluoride from water by aligned carbon nanotubes

Annealing amorphous carbon nanotubes for their application in hydrogen storage

Surface characteristics of modified carbon nanotubes and its application in lead adsorption from aqueous solution

Electrochemical hydrogen storage of aligned multiwalled carbon nanotubes

Synthesis of carbon nanotubes with Ni/CNTs catalyst

Competitive adsorption of Pb ² ⁺ , Cu ² ⁺ and Cd ² ⁺ ions from aqueous solutions by multiwalled carbon nanotubes

High-yield synthesis of multi-walled carbon nanotubes by water-protected arc discharge method

Adsorption of cadmium(II) from aqueous solution by surface oxidized carbon nanotubes

Hydrogen storage by platelet-carbon fibers at room temperature

Mechanical and electrical properties of carbon nanotube ribbons

Structural Characterizations of Long Single-Walled Carbon Nanotube Strands

A new method for synthesizing double-walled carbon nanotubes

Rapid growth of well-aligned carbon nanotube arrays

Hydrogen Uptake in Boron Nitride Nanotubes at Room Temperature

Growth mechanism of Y-junction carbon nanotubes

Lead adsorption on carbon nanotubes

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