Production of anhydrous, crystalline boron oxide in fluidized bed reactor

Kocakusak, S.; Akçay, Kani; Ayok, T.; Koöroǧlu, H.J.; Koral, M.; Savaşçı, Ömer Tunç; Tolun, R.

doi:10.1016/0255-2701(95)04142-7

Cited by 36 publications

(20 citation statements)

References 5 publications

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“…Additionally, FTIR spectra comparing boric acid with hydroxylated hBN (Figure S5) indicates no significant formation of boric acid. Another possibility, the formation of boron trioxide, B 2 O 3 , from boric acid is ruled out as no evidence of it is seen by AFM or FESEM, and our heating rate is not conducive to its formation . Even if a trace amount of B 2 O 3 is formed, it will be converted to boric acid during treatment with hot water and removed.…”

mentioning

confidence: 97%

Large Scale Thermal Exfoliation and Functionalization of Boron Nitride

Cui

Oyer

Glover

et al. 2014

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208

147

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A scalable method to produce exfoliated and functionalized boron nitride sheets is described. The procedure involves the high temperature treatment of commercially obtained hexagonal boron nitride followed by hydrolysis. A mechanism of formation is proposed and analysis by XRD, FTIR, FESEM, TEM, AFM, XPS, TGA, and Raman spectroscopy reveals exfoliated boron nitride sheets functionalized by hydroxyl groups that can be further reacted with isocyanate.

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confidence: 97%

Large Scale Thermal Exfoliation and Functionalization of Boron Nitride

Cui

Oyer

Glover

et al. 2014

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208

147

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“…Before heating the thin films, they were cut in four pieces of 4 cm 2 , resulting in 12 boron thin films; six of them were heated at 400ºC and the other six at 750ºC (these temperatures were chosen based on the fact that it is desired that all boric acid is transformed into boron oxide [10]), all for four hours. After heating, each boron thin film was coupled with a detector (CR-39 with 9 cm 2 and LR-115 with about 2.5 cm 2 ), resulting in 12 different assemblies and then the boron thin films were irradiated with thermal neutrons (the lowest concentration films were irradiated for 60 minutes and the other films for 10 minutes).…”

Section: Methodsmentioning

confidence: 99%

Manufacturing of thin films of boron for the measurement of the ${}^{10}B(n,\alpha)$${}^{7}Li$ reaction used in BNCT

Smilgys¹,

Vellame²,

Coelho³

et al. 2012

Proceedings of XXXIV Edition of the Brazilian Workshop on Nuclear Physics — PoS(XXXIV BWNP)

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The Boron Neutron Capture Therapy (BNCT) has been considered for the treatment of different types of aggressive cancers located in areas of difficult access or which already presented metastasis. The working principle of this therapy is the selective delivery of boron to the tumor cells, followed by the neutron irradiation that will induce the emission of α particles through the 10 B(n,α) 7 Li reaction used in BNCT. The high energy deposition rate of the product particles causes the death of the cells and this therapy becomes much effective if the healthy tissue is less exposed to this radiation. The objective of this work is to develop a method for measuring the rate of this reaction by using boron thin films that were manufactured with different concentrations of boric acid deposited over muscovite mica and then exposed to different irradiation time intervals at the reactor IEA-R1 located at IPEN, São Paulo. Here we show the first results on the density and uniformity of the boron thin films, where the detection of the particles is made using track detectors CR-39 and LR-115, their calibration and the first result for the 10 B(n,α) 7 Li reaction rate measurement.

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“…there are many disadvantages regarding high temperatures methods such as the existence of impurities in the product and the corrosion created by the molten product. Furthermore, the hard product requires severe grinding and the energy consumption is high in the high temperature methods [12].…”

Section: Introductionmentioning

confidence: 99%

“…There have been many attempts to overcome the problems and develop new methods preventing melting phase formation. Kocakusak et al [15] produced boron oxide by dehydrating boric acid at temperature about 250-300 on fluidized bed with a grain size of about 400 μm [12]. Vasconi et al [13] dehydrated boric acid at temperature below 400 °C used a two-stage dehydration process at a relative vacuum.…”

Section: Introductionmentioning

confidence: 99%

The kinetics and mechanism of B2O3 formation from the chemically-synthesized HBO2 under non-isothermal conditions

Aghili

Panjepour

Meratian

2021

Reac Kinet Mech Cat

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In this investigation, a crystalline metaboric acid (HBO 2 ) powder was subjected to a dehydration process to transform it into boron oxide (B 2 O 3 ) using thermogravimetry (TG) technique in an argon atmosphere under non-isothermal conditions at different heating rates (3, 5, 10, and 15 °C min −1 ). The results of kinetic analysis revealed that the dehydration process was a complex one comprising a consecutive region (region I) followed by a parallel one (region II). Using the relevant kinetic models, the mechanisms involved in each region were analyzed by a proposed method for the complex reactions separately and find that the dehydration mechanism in the region I consisted of the kinetic models R 4 : g(α) = [1 − (1 − α) 2/3 ] (the chemical reaction at the HBO 2 /H 2 B 4 O 7 interface) and D 3 : g(α) = [1 − (1 − α) 1/3 ] 2 (the diffusion of H 2 O (g) in the H 2 B 4 O 7 layer), while that in the region II was parallel and consisted of the models D 3 (the diffusion of H 2 O (g) in the H 2 B 4 O 7 layer) and R 4 (the chemical reaction at the of H 2 B 4 O 7 /B 2 O 3 interface). Therefore, based on the kinetic results, the mechanisms of complex processes could be determined by the method.

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Production of anhydrous, crystalline boron oxide in fluidized bed reactor

Cited by 36 publications

References 5 publications

Large Scale Thermal Exfoliation and Functionalization of Boron Nitride

Large Scale Thermal Exfoliation and Functionalization of Boron Nitride

Manufacturing of thin films of boron for the measurement of the ${}^{10}B(n,\alpha)$${}^{7}Li$ reaction used in BNCT

The kinetics and mechanism of B2O3 formation from the chemically-synthesized HBO2 under non-isothermal conditions

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