Spray drying formation of metal oxide (TiO2 or SnO2) nanoparticle coated boron particles in the form of microspheres and their physicochemical properties

Lee, Haneol; Deshmukh, P. R.; Hyun, Hyung Soo; Sohn, Youngku; Shin, Weon Gyu

doi:10.1016/j.jallcom.2019.151923

Cited by 19 publications

(15 citation statements)

References 42 publications

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“…Deshmukh [ 115 , 116 ] prepared B@SnO 2 and B@TiO 2 particles at room temperature with a simple wet-chemistry method. The thermal analysis results suggest the same conclusion as that obtained by Lee [ 113 ]. Furthermore, the ignition performance of the coated particles was studied.…”

Section: Surface Modification Of Boron Powdersupporting

confidence: 89%

“…Boron particles with metal oxide coatings have been synthesized using the spray-drying process [ 113 ], the wet-chemistry method [ 115 , 116 ], and chemical vapor deposition [ 117 ]. Lee [ 113 ] successfully prepared spherical boron nanoparticles coated with metal oxide (TiO 2 or SnO 2 ) by the spray-drying method. The diameter of the microspheres is in the range of 5–10 μm, showing a porous microsphere structure ( Figure 15 d,e).…”

Section: Surface Modification Of Boron Powdermentioning

confidence: 99%

“… SEM images of ( a ) raw boron [ 110 ]; ( b ) B@NiO [ 111 ]; ( c ) B@CuO [ 112 ]; ( d ) B@SnO 2 [ 113 ]; ( e ) B@TiO 2 [ 113 ]; and ( f ) B@CeO 2 [ 114 ]. …”

Section: Figurementioning

confidence: 99%

“… ( a ) TGA, ( b ) large view of TGA (25–675 °C), ( c ) DTG, and ( d ) large view of DTG (400–775 °C) of boron, TiO 2 , SnO 2 , and boron particles coated with 0.1 and 0.2 wt.% metal oxide (TiO 2 or SnO 2 ) in the presence of an air atmosphere [ 113 ]. …”

Section: Figurementioning

confidence: 99%

“…Boron Coated with TiO 2 or SnO 2 Metal oxides are attractive candidates as combustion catalysts in propellants. Boron particles with metal oxide coatings have been synthesized using the spray-drying process [113], the wet-chemistry method [115,116], and chemical vapor deposition [117]. Lee [113] successfully prepared spherical boron nanoparticles coated with metal oxide (TiO 2 or SnO 2 ) by the spray-drying method.…”

Section: Boron Coated With Tio2 or Sno2mentioning

confidence: 99%

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High Calorific Values Boron Powder: Ignition and Combustion Mechanism, Surface Modification Strategies and Properties

Liu¹,

Wang²,

Liu³

et al. 2023

Molecules

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Boron powder is a kind of metal fuel with high gravimetric and volumetric calorific values, which has been widely used in military fields such as solid propellants, high-energy explosives, and pyrotechnics. However, the easily formed liquid oxide layer can adhere to the surface of boron powder and react with the hydroxyl (-OH) group of hydroxyl-terminated polybutadiene (HTPB) binder to form a gel layer that is detrimental to propellant processing and restricts the complete oxidation of boron powder. Therefore, to improve the combustion efficiency of boron powder, the ignition and combustion mechanisms of boron powder have been studied, and surface coating modification strategies have been developed by researchers worldwide, aiming to optimize the surface properties, improve the reaction activity, and promote the energy release of boron powder. In this review, recent studies on the ignition and combustion mechanisms of boron powder are discussed. Moreover, the reported boron powder coating materials are classified according to the chemical structure and reaction mechanism. Additionally, the mechanisms and characteristics of different coating materials are summarized, and the mechanism diagrams of fluoride and metal oxide are provided. Furthermore, promising directions for modification methods and the potential application prospects of boron powder are also proposed.

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Section: Surface Modification Of Boron Powdersupporting

confidence: 89%

Section: Surface Modification Of Boron Powdermentioning

confidence: 99%

“… SEM images of ( a ) raw boron [ 110 ]; ( b ) B@NiO [ 111 ]; ( c ) B@CuO [ 112 ]; ( d ) B@SnO 2 [ 113 ]; ( e ) B@TiO 2 [ 113 ]; and ( f ) B@CeO 2 [ 114 ]. …”

Section: Figurementioning

confidence: 99%

Section: Figurementioning

confidence: 99%

Section: Boron Coated With Tio2 or Sno2mentioning

confidence: 99%

See 3 more Smart Citations

High Calorific Values Boron Powder: Ignition and Combustion Mechanism, Surface Modification Strategies and Properties

Liu¹,

Wang²,

Liu³

et al. 2023

Molecules

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Preparation and characteristics of boron‐based composite micro‐units encapsulated by potassium perchlorate

Qin,

Liu,

Zeng

et al. 2024

Propellants Explo Pyrotec

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To improve the ignition and combustion performance of boron (B), the B@ potassium perchlorate (KP) composite micro‐units are successfully prepared by recrystallization of solvent evaporation. The morphology and structural composition show that B@KP composite micro‐units are formed by the gentle recrystallization of KP at the heterogeneous interface between B particles and solvents. It is shown by thermal analysis that the initial thermal decomposition temperature of KP is reduced by 49 °C due to the reduction of particle size. In addition, the heat of 420 J/g released by the thermal decomposition of KP is beneficial to the evaporation of the oxide boron (B2O3) film on the surface of B, which reduces the initial oxidation temperature of B by 185 °C and improves the ignition performance of B. Interestingly, the oxygen (O2) released by the thermal decomposition of KP quickly reacts with B to release heat of 3608 J/g, which improves the combustion performance of B. The optimal mass ratio of B to KP is 1: 5, which results in the ignition delay time of 641 ms, a reduction of 19 ms compared to the physical mixed sample. The ignition delay times of other samples are 724 ms, 680 ms and 650 ms respectively, and B could not be ignited successfully. In the combustion process, all samples emit a bright green flame of B combustion, and even a fierce combustion flame like a mushroom cloud appears. In a word, the B@KP composite micro‐units have great potential for application in solid propellants.

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A Review on Microencapsulated Phase‐Change Materials: Preparation, Photothermal Conversion Performance, Energy Storage, and Application

Wang,

Yan,

Meng

et al. 2023

Solar RRL

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The leakage‐prone disadvantage of pure phase change materials (PCMs) has hampered their practical application, and the encapsulation technology of PCMs has been favored for its ability to mitigate leakage. Combining large solar reserves with energy storage technology can increase the utilization of renewable energy and broaden the application of microencapsulated phase change materials (MEPCMs) in the field of solar energy. First, the fabrication technologies of MEPCMs, which include physical, chemical, and physical–chemical methods, have been comprehensively elaborated in this article. Second, the characteristics of different methods are also summarized. Then, the influences of MEPCMs properties on their thermal storage capacity have been clarified. This work shows the supercooling, phase separation, mechanical properties, encapsulation efficiency, and photothermal conversion performance of MEPCMs. Modification of MEPCMs by metal materials and their oxides, carbon, and semiconductor materials to improve the light absorption capacity. In addition, two‐dimensional materials such as MXene have been widely used to improve the photothermal properties of MEPCMs. Finally, the applications of MEPCMs in the construction, slurry, textile, and food industries are discussed. This work can provide some useful guidance for the optimization strategies of the photothermal conversion performance and practical applications of MEPCMs.

show abstract

Spray drying formation of metal oxide (TiO2 or SnO2) nanoparticle coated boron particles in the form of microspheres and their physicochemical properties

Cited by 19 publications

References 42 publications

High Calorific Values Boron Powder: Ignition and Combustion Mechanism, Surface Modification Strategies and Properties

High Calorific Values Boron Powder: Ignition and Combustion Mechanism, Surface Modification Strategies and Properties

Preparation and characteristics of boron‐based composite micro‐units encapsulated by potassium perchlorate

A Review on Microencapsulated Phase‐Change Materials: Preparation, Photothermal Conversion Performance, Energy Storage, and Application

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