Abstract. The synthesis and growth of boron nitride nanotubes (BNNTs) based on ball milling of crystalline boron powder followed by heat treatment were …
Carbon nanotubes were treated by high-energy ball milling processing for different milling times, and the samples were observed by HRTEM.The broken nanotubes and lots of carbon onion-like particles were obtained in the sample milled for 15 min. When the milling time was up to 60 min, carbon nanotubes turned into amorphous carbon.On …
Boron nitride nanotubes were synthesized from boron oxide by high-energy ball milling and annealing method. The diameter of the nanotubes is in the range of 20–200 nm.
This chapter reviews the research on the synthesis of carbon nanotubes (CNTs) using a ball milling-annealing method, in which graphite powder is first treated using high-energy ball milling (HEBM ...
Fig. 2 shows the morphologies of milled mixture powders under different ball-milling times. It can be seen that more mixture powders became flattened as the ball-milling time increased from 2 to 8 h, which was caused by the shearing effect of the balls.The largest surface areas were achieved in the 8 h ball-milled mixture powders, …
High-yield multiwalled boron nitride (BN) nanotubes have been produced using a ball milling-annealing method. The BN nanotubes with a diameter less than 10 nm and a well-crystallized multiwalled ...
Ball milling and annealing method is an important method for synthesis of boron nitride nanotube. ... The result indicated that the optimal milling time for synthesis of BN nanotubes with high productivity is 80h. The reason for formation of these high productivity BN nanotubes can be ascribed to the high chemical reactivity and …
This chapter reviews the research on the synthesis of carbon nanotubes (CNTs) using a ball milling-annealing method, in which graphite powder is first treated using high-energy ball milling (HEBM ...
Bae et al. [9] have produced BN nanotubes by first ball milling of B powder, followed by annealing in NH 3 gas in the temperature range of 1000–1200 °C. Li et al. …
High-yield multiwalled boron nitride (BN) nanotubes have been produced using a ball milling−annealing method. The BN nanotubes with a diameter less than 10 nm and a well-crystallized …
Ball-milling method. Ball milling is a promising technique to synthesize BNNT at industrial scale with low cost. In principle, direct reaction between boron and nitrogen in ambient conditions can be stimulated by introducing defective or amorphous structure in boron starting powders. ... In situ formation of BN nanotubes during …
The ball milling process was carried out by placing 0.25 g EG and 1.25 g (NH 4) 2 MoS 4 into a 50 mL agate pot. The ball milling beads used had diameters of 2 mm and 5 mm, with a total weight of 90 g, and a weight ratio of 1:3. The ball milling procedure was performed at 450 rpm for 30 min, with a 5-minute interval between each run.
This chapter reviews the research on the synthesis of carbon nanotubes (CNTs) using a ball milling-annealing method, in which graphite powder is first treated using high-energy ball milling (HEBM) at room temperature to create a precursor structure, followed by a thermal annealing to activate nanotube growth. This chapter includes an …
The influence of the Si support, gas ratio and the growth pressure was studied using hot-filament enhanced CVD method in the synthesis of carbon nanotubes . The formation of only MWNTs was observed with average diameter more than 20 nm on catalyst film without Si support.
This study focuses on the preparation of a Mg 2 Ni hydrogen storage alloy through high-energy ball milling, further enhanced by composite graphene and multi-walled carbon nanotubes (MWCNTs) modification. It is evident that high-energy ball milling successfully incorporates graphene and MWCNTs onto the surface of Mg 2 Ni particles. …
Herein, an efficient simple method is developed to prepare a composite of N-doped carbon embedding Si nanoparticles (Si@C) to response to the above Si faced challenges. Its preparation process just consists of very simple ball milling and pyrolysis carbonization, showing great simplicity. The findings confirm that the combination of the …
The formation of boron nitride ~BN! nanotubes via a solid-state process is demonstrated. The nanotubes are produced by first ball-milling hexagonal BN powder to generate …
Multi-walled and open-ended TiSe 2 nanotubes are also synthesized by using the ball milling–annealing method [11]. The above research works demonstrate that the ball-milling technique, which is generally regarded as a traditional technique with a history of several centuries [12], could become an important tool in 1D nanomaterial …
The materials for milling were mixtures of nanotubes and iron powder (purity >99.9%). It has been testified, from the results of milling pure nanotubes and milling the mixture of nanotubes and iron powder, respectively, under the same milling conditions, that the addition of iron powder can increase the carbon nanoparticle …
Among them, the ball milling–annealing method, consisting of a pre-ball milling and a subsequent thermal annealing process, ... The Presence of iron particles plays a positive role in carbon nanotubes formation and promotes the process. Here, it should be noted that, the metals used to catalyze CNT formation are most often …
Ball milling–annealing method, which was proposed by Chen et al. [11], afforded a new approach for producing mass quantities BNNTs. In this paper, the synthesis of BN nanotubes by ball milling B 2 O 3 in N 2 gas and then annealing under NH 3 was reported. The formation mechanism of the BN nanotubes was also discussed.
Boron nitride nanotubes and nanowires in high purity and large quantity have been produced using an improved ball-milling and annealing method. Boron powder was first ball milled to produce nanosized boron particles with a metastable structure. ... The formation yield of BN nanotubes produced using this method has been achieved …
For the development of high-performance aluminum (Al) matrix composites reinforced with carbon nanotubes (CNTs), high energy ball milling (HEBM) is the most prevalent method to disperse CNTs in Al powder.However, the dispersion mechanism of CNTs in Al powder is still unclear, mainly because it is difficult to characterize CNTs …
A commercial multi-walled carbon nanotube (CNT) sample (Nanocyl 3100) was used as the starting material. According to the supplier, these nanotubes have an average diameter of 9.5 nm, an average length of 1.5 μm and carbon purity higher than 95%.In order to obtain the modified samples, the commercial carbon nanotubes were …
As an initial step for synthesis of BNNTs, crystalline elemental boron was first milled using a planetary mill under 2 atm of N 2. Fig. 2 shows the SEM images of boron powder pulverized at 300 rpm using the STS milling balls and STS milling vessels for 12, 24 and 100 h, respectively. Fig. 1 shows an optically magnified image of the initial boron …
The influence of ball-milling in the texture and surface chemistry of multi-walled carbon nanotubes (MWCNT) was studied in this work. Treatment times up to 360 min at constant frequency (15 vibrations/s) and frequencies from 10 to 20 vibrations/s during 30 min were used for the preparation of the modified samples.These were …
The formation of a single trigonal phase in FeF 3 /10.0 wt% AB was verified by the XRD patterns regardless ... As a result, the ball-milling method and carbon content functioned as factors that significantly influenced the performance of the thermal cell ... Mixing of carbon nanotubes (CNTs) and aluminum powder for powder metallurgy use. ...
Mechano-thermal method was used for synthesizing the carbon nanotubes (CNTs) in this study. In this method, graphite powders in the elemental form were firstly exposed to milling process in high-energy ball milling and then the milled powders were annealed at high temperatures. As a result of milling of the graphite, ultra-active …
Ball milling and annealing method is an important method for synthesis of boron nitride nanotube. How to improve their productivity through this method is a problem that people have been studying ...
In this study, nanotubes which have the diameters between 50 and 200 nm were produced at a short time ball milling process and a lower annealing temperature of 1600 °C although bamboo and ...
The material of ball mill tank and ball is stainless steel. The diameter of the stainless ball is 10mm, 8mm and 5mm. The ball milling process was carried out under the protection of …
Raman spectroscopy is a useful method to investigate the effect of ball milling on the structural integrity of CNTs, as demonstrated by Pierard et al. . The Raman spectra obtained for the raw and ball-milled samples tested in this study are collected in Figure 4, together with the I D /I G ratios for the selected samples.
The specific surface area values of CNTs before and after ball milling were measured by the BET method with N 2 gas at 77.41 K using an automatic ... This indicates that the addition of MgO powder can indeed increase the formation rate of shorter MWNTs, which results from the fact that MgO particles can presumably act as numerous tiny …
The structural modification of graphite and multi-wall carbon nanotubes (MWCNTs) during ball-milling was examined. A comparison of structures after ball-milling was made between graphite and MWCNTs.
We report the design and fabrication of Co, N-doped carbon nanocages by the ball milling-hard template method. This synthesis method consists of two key points. First, potassium chloride (KCl) with a cubic crystal structure is used as the hard template. Second, ball milling is an effective method to uniformly cover the precursor on the …
