Synthesis of boron nitride nanotubes from ammonia and a powder mixture of boron and iron oxide

Date

2013-03-01

Author

Ozmen, Didem
Sezgi, Naime Aslı
BALCI, FATMA SUNA

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

221
views

0
downloads

Boron nitride nanotubes (BNNTs) were synthesized from the reaction of ammonia gas with a powder mixture of boron and iron oxide in a tubular reactor connected to a mass spectrometer for the on-line chemical analysis of the reactor outlet stream at different temperatures and inlet gas compositions. XRD results showed that hexagonal and rhombohedral boron nitrides, iron, boron oxide, and iron boride were the solid phases formed in these materials depending on the reaction temperature and gas composition. It was observed that the crystallinity of the product increased with an increase in temperature. The synthesized materials exhibited Type II isotherms. The chemical analysis revealed that the only reaction taking place in the gas phase was the decomposition reaction of the ammonia gas and BNNTs were produced by the reaction of nitrogen formed from the decomposition reaction with FexBy formed from the reaction of B with Fe2O3.

Subject Keywords

Nanotubes, Boron nitride, Characterization, Gas phase analysis, Synthesis

URI

https://hdl.handle.net/11511/36292

Journal

CHEMICAL ENGINEERING JOURNAL

DOI

https://doi.org/10.1016/j.cej.2012.12.057

Collections

Department of Chemical Engineering, Article

Suggestions

OpenMETU
Core

Production of boron nitride by carbothermic and mechanochemical methods, and nanotube formation Camurlu, HE; Aydogdu, A; Topkaya, Yavuz Ali; Sevinc, N (2003-09-12) The formation of hexagonal boron nitride by carbothermic reduction of boron oxide and nitridation has been examined. Experiments were conducted in the temperature range of 1100-1500degreesC for durations between 15-240 minutes. Products were examined by X-ray, SEM and chemical analysis. The results showed that the reaction proceeds through a gaseous boron containing species, which is most probably 13203(g). It was found that all of the carbon was consumed and formation of boron nitride was complete in 2 hou...
Synthesis and characterization of boron carbide films by plasma-enhanced chemical vapor deposition Eroglu, OD; Sezgi, Naime Aslı; Ozbelge, HO; Durmazucar, HH (2003-03-01) The plasma-enhanced chemical vapor deposition of boron carbide was investigated on quartz glass and alumina substrates from a gas mixture of BCl3, H-2, and CH4 in an inductively coupled plasma (ICP) medium produced by a radio frequency (RF) discharged onto the gases passing through a tubular reactor under atmospheric pressure. A thin solid boron carbide coating with a gray color was deposited on both substrates. The results of XRD revealed that the major solid phase formed in the coating material was beta-r...
Characterization and kinetics of light crude oil combustion in the presence of metallic salts Kök, Mustafa Verşan (American Chemical Society (ACS), 2004-05-01) In this research, a reaction cell, thermogravimetry (TG), and differential thermal analysis (DTA) were used to characterize the light crude oil combustion and kinetics in the presence of copper(I) chloride (CuCl) and magnesium chloride (MgCl2·6H2O). In TG-DTA experiments with magnesium chloride, three reaction regions were identified, known as distillation, low-temperature oxidation (LTO), and high-temperature oxidation (HTO). In the case of copper(I) chloride, two main transitional stages are observed with...
Synthesis of zinc oxide nanoparticles elaborated by microemulsion method Yildirim, Ozlem Altintas; Durucan, Caner (2010-09-17) Zinc oxide (ZnO) nanoparticles were synthesized by a reverse microemulsion system formed from sodium bis(2-ethylhexyl)sulfosuccinate (Aerosol OT, or AOT):glycerol:n-heptane. The zinc precursor was zinc acetate dihydrate. The formation of ZnO nanoparticles was achieved by calcination of premature zinc glycerolate microemulsion product in air at 300, 400 and 500 degrees C. The crystal structure and the morphology of the ZnO nanoparticles were characterized by X-ray diffraction (XRD) and scanning electron micr...
Production of B4C Coatings by CVD Method in a Dual Impinging-Jet Reactor: Chemical Yield, Morphology, and Hardness Analysis Karaman, Mustafa; Sezgi, Naime Aslı; Oezbelge, H. Oender (Wiley, 2009-11-01) beta-rhombohedral boron carbide (B4C) was deposited on a tungsten substrate from a BCl3-H-2-CH4 gas mixture in a dual impinging-jet chemical vapor deposition reactor. On-line FTIR analysis of the product stream proved the formation of BHCl2 and HCl as by products, in a competing parallel reaction. A maximum of 13% chemical yield of boron carbide was observed, and the yield was found to have increasing trend with an increase in temperature. XRD analysis proved the existence of rhombohedral B4C phase at 1300 ...

Citation Formats

D. Ozmen, N. A. Sezgi, and F. S. BALCI, “Synthesis of boron nitride nanotubes from ammonia and a powder mixture of boron and iron oxide,” CHEMICAL ENGINEERING JOURNAL, pp. 28–36, 2013, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/36292.