scholarly journals Preparation, High-Density Spherical, and Low Sensitivity of RDX/NC/PMMA Composite Particles

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Xinlei Jia ◽  
Wenshan Peng ◽  
Lanjuan Xu ◽  
Qing Cao ◽  
Shaohua Xing ◽  
...  
Keyword(s):  
Spray Drying ◽  
High Energy ◽  
Safety Performance ◽  
Spherical Particles ◽  
Core Material ◽  
Composite Particles ◽  
Drying Method ◽  
X Ray Diffraction ◽  
Low Sensitivity ◽  
Friction Sensitivity

In order to reduce the mechanical sensitivity of cyclotrimethylenetrinitramine (RDX) and improve its energy density, spherical RDX/PMMA/NC composite particles were prepared by spray drying method, selecting polymethyl methacrylate (PMMA, hydrocarbon binder) with excellent mechanical properties and nitrocellulose (NC, energy-containing binder) with higher density as the desensitizing shell material, RDX as the core material. PMMA/NC composite particles of the same component were prepared by a simple solvent evaporation method at the same time. Structural characterizations and thermal stability of the composites were systematically studied by scanning electron microscopy (SEM), X-ray diffraction (XRD), and differential scanning calorimeter (DSC), respectively. Moreover, the safety performance has been qualitatively tested and analyzed through impact sensitivity and friction sensitivity. The results show that the addition of NC/PMMA binder would not change the original crystal structure of RDX, and the RDX/NC/PMMA composites fabricated by spray drying presented spherical particles with uniform distribution and smooth surface. The Tp0 of RDX/NC/PMMA composite particles increased from 220.3°C to 228.2°C, improving the thermal decomposition performance. The H50 rose from 29.32 cm to 84.3 cm, and the probability of friction explosion decreased from 96% to 8%, significantly enhancing the safety performance. In short, the RDX/NC/PMMA composites prepared via the spray drying method and the improvement of their performance have positive significance for the development of explosives in pursuit of high energy and low sensitivity.

The Morphology of Si-K-HAs Composite Prepared by Spray Drying

2019 ◽  
Vol 966 ◽  
pp. 19-24
Author(s):  
Srie Muljani ◽  
Heru Setyawan ◽  
Ketut Sumada
Keyword(s):  
Surface Area ◽  
Spray Drying ◽  
Humic Substance ◽  
Spherical Particles ◽  
Precipitation Method ◽  
Infrared Spectrometry ◽  
Drying Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Spray Dried

The silica potassium humic substance (Si-K-HAs) composite have been produce by spray drying successfully. In the previous study the preparation of Si-K-HAs gel by precipitation method required the addition of acid so that Si-K-HAs gel product contains acid salts. This study was develope spray drying method in order to eliminate the use of acid. The mixture of potassium silicate, cellulose and humic potassium solution was mixed with varying volume ratios and flowed into a spray dryer to produce Si-K-HAs powder. The used of cellulose (CMC) in this study acts as a homogeneous agent so that silica and humic substance can be completely mixed at controlled viscosity. Si-K-HAs products were characterized by Scanning electron microscopy (SEM), X-ray fluorescence (XRF), X-ray diffraction (XRD), Fourier transform infrared spectrometry (FTIR), and Surface area analytical (SAA). The result showed that the Si-K-HAs composite prepared by spray dryers have spherical particles, SiO2 in the range of 48-50%, K2O in the range of 49-50%. The present of cellulose caused the increasing of Si-K-HAs particle size e.g 17.30 μm prepared without CMC to 41.11 μm prepared with addition of 100g of CMC. The presence of cellulose can also increase the surface area of the spray-dried Si-K-HAs particles from 111.92 m2g-1; 163.241 m2g-1.

scholarly journals Nano-CL-20/HMX Cocrystal Explosive for Significantly Reduced Mechanical Sensitivity

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Chongwei An ◽  
Hequn Li ◽  
Baoyun Ye ◽  
Jingyu Wang
Keyword(s):  
Spray Drying ◽  
Raw Materials ◽  
Drop Height ◽  
Drying Method ◽  
X Ray Diffraction ◽  
Mechanical Sensitivity ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Friction Sensitivity ◽  
Scanning Electron

Spray drying method was used to prepare cocrystals of hexanitrohexaazaisowurtzitane (CL-20) and cyclotetramethylene tetranitramine (HMX). Raw materials and cocrystals were characterized using scanning electron microscopy, X-ray diffraction, differential scanning calorimetry, Raman spectroscopy, and Fourier transform infrared spectroscopy. Impact and friction sensitivity of cocrystals were tested and analyzed. Results show that, after preparation by spray drying method, microparticles were spherical in shape and 0.5–5 µm in size. Particles formed aggregates of numerous tiny plate-like cocrystals, whereas CL-20/HMX cocrystals had thicknesses of below 100 nm. Cocrystals were formed by C–H⋯O bonding between –NO2 (CL-20) and –CH2– (HMX). Nanococrystal explosives exhibited drop height of 47.3 cm, and friction demonstrated explosion probability of 64%. Compared with raw HMX, cocrystals displayed significantly reduced mechanical sensitivity.

High Energy Density LiFePO4/C Cathode Material Synthesized by Wet Ball Milling Combined with Spray Drying Method

2017 ◽  
Vol 164 (14) ◽  
pp. A3666-A3672 ◽  
Author(s):  
Hao Liu ◽  
Yuanyuan Liu ◽  
Liwei An ◽  
Xinxin Zhao ◽  
Li Wang ◽  
...  
Keyword(s):  
Energy Density ◽  
Cathode Material ◽  
Ball Milling ◽  
Spray Drying ◽  
High Energy ◽  
High Energy Density ◽  
Drying Method

3D high-energy-density and low sensitivity materials: synthesis, structure and physicochemical properties of an azide–Cu(ii) complex with 3,5-dinitrobenzoic acid

RSC Advances ◽  
2014 ◽  
Vol 4 (31) ◽  
pp. 16087-16093 ◽  
Author(s):  
Xiangyu Liu ◽  
Qi Yang ◽  
Zhiyong Su ◽  
Sanping Chen ◽  
Gang Xie ◽  
...  
Keyword(s):  
Energy Density ◽  
Coordination Polymer ◽  
Physicochemical Properties ◽  
Single Crystal ◽  
High Energy ◽  
High Energy Density ◽  
X Ray Diffraction ◽  
Materials Synthesis ◽  
X Ray ◽  
Low Sensitivity

A novel 3D energetic coordination polymer of azide–Cu(ii), Cu(3,5-DNBA)(N3), was synthesized and structurally characterized by single crystal X-ray diffraction, where 3,5-DNBA represents 3,5-dinitrobenzoic acid.

EFFECT OF MILLING TIME ON MECHANOCHEMICAL SYNTHESIS OF TiO2 NANOPARTICLES

2008 ◽  
Vol 22 (18n19) ◽  
pp. 2955-2961 ◽  
Author(s):  
MARYAM SALARI ◽  
MASIH REZAEE ◽  
S. M. MOUSAVI KOIE ◽  
P. MARASHI ◽  
H. ABOUTALEBI
Keyword(s):  
Milling Time ◽  
Titanium Dioxide Nanoparticles ◽  
Milled Powder ◽  
High Energy ◽  
Spherical Particles ◽  
X Ray Diffraction ◽  
Starting Mixture ◽  
Annealed Powder ◽  
Energy Ball ◽  
Titanyl Sulphate

Titanium dioxide nanoparticles have great potential for use in photocatalytic applications, cosmetics, white pigments and so on. In this paper, the effect of milling time on particle size, morphology and phase composition of TiO 2 nanoparticles, prepared by mechanochemical method, was investigated by X-Ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). TiO 2 nanoparticles were prepared by the use of high energy ball milling of titanyl sulphate ( TiOSO 4) and NaCl powders as the starting mixture in different milling durations. The milled powder was annealed at 700°C for 30 min. The NaCl powder, used as the diluent phase, was removed by washing the annealed powder with distilled water. It was found that with increasing milling time, decrease in the size of equiaxed spherical particles and increase in temperature of anatase to rutile transformation ( A → R ) can be observed.

Preparation of Spherical FePO4 Cathode Material for Lithium Ion Batteries

2011 ◽  
Vol 347-353 ◽  
pp. 576-581 ◽  
Author(s):  
Xi Yang ◽  
Jun Xi Zhang ◽  
Shi Ming Zhang ◽  
Li Cheng Yan ◽  
Ying Mei ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Electrochemical Impedance ◽  
Ph Value ◽  
Lithium Ion ◽  
Spherical Particles ◽  
Precipitation Process ◽  
Drying Method ◽  
X Ray Diffraction ◽  
Co Precipitation ◽  
The Ideal

The spherical FePO4 was prepared by a novel co-precipitation process followed by spray drying method, using Fe (NO3)3•9H2O, NH4H2PO4, NH3•H2O and polyvinyl alcohol. The pH value plays a pivotal role in determining the morphology of spherical particles; the sample, obtained at pH=3, was found to have the ideal spherical particles and electrochemical property. The X-ray diffraction analysis showed the phase transition of FePO4 with calcining temperature, amorphous FePO4 can exhibit better performance than the crystalline phase. Electrochemical behavior of spherical FePO4 was studied by the charge-discharge tests and electrochemical impedance spectroscopy. The results show that this process is a promising method to prepare spherical FePO4cathode materials for lithium ion batteries.

The preparation of sub-micron spherical Fe-Ph/Cl-20 by the spray-drying method and its combustion

RSC Advances ◽  
2016 ◽  
Vol 6 (116) ◽  
pp. 115303-115307
Author(s):  
Nai-Meng Song ◽  
Rui-Yi Gan ◽  
Wen-Yuan Zhao ◽  
Guo-Ying Zhang ◽  
Li Yang
Keyword(s):  
Spray Drying ◽  
Spherical Shape ◽  
Composite Particles ◽  
Drying Method ◽  
Drying Technology

This study introduces the preparation of sub-micron composite particles of phloroglucinol-Fe and Cl-20 (Fe-Ph/Cl-20) with a spherical shape using spray drying technology.

Binder-Free Thin-Film Electrode Fabricated by Spray Drying Method: A Case of LiFePO4

2020 ◽  
Vol 18 (1) ◽  
Author(s):  
Xiaolong Guo ◽  
Tu Lan ◽  
Xiang Feng ◽  
De Li ◽  
Yong Chen
Keyword(s):  
Thin Film ◽  
Spray Drying ◽  
Film Electrode ◽  
Li Ion Batteries ◽  
Drying Method ◽  
X Ray Diffraction ◽  
Thin Film Electrode ◽  
Binder Free ◽  
Li Ion ◽  
Foil Substrate

Abstract With the development of portable electronic devices, it is an urgent demand to miniaturize energy storage components, especially for Li-ion batteries, and the thin-film electrode is a promising miniaturization strategy. In this work, we successfully fabricated a binder-free thin-film electrode of LiFePO4/C by a spray drying method. According to the scanning electron microscopy, the Al-foil substrate was coated with a porous LiFePO4/C layer of ca. 4 µm thick, and the X-ray diffraction and the Raman spectra reveal the good crystallization of LiFePO4 and the presence of amorphous carbon. The as-prepared electrode exhibits an excellent cycle stability, which works quite good even after 2000 cycles. Thereby, we suggested that the as-prepared binder-free thin-film electrode can be potentially applied in the field of all-solid-state, flexible, and micro Li-ion batteries.

Synthesis of the microspheric cocrystal CL-20/2,4-DNI with high energy and low sensitivity by a spray-drying process

2019 ◽  
Vol 43 (44) ◽  
pp. 17390-17394 ◽  
Author(s):  
Jianchao Liu ◽  
Zhenzhan Yan ◽  
Dianpeng Chi ◽  
Li Yang
Keyword(s):  
Spray Drying ◽  
High Energy ◽  
Molar Ratio ◽  
Drying Process ◽  
Low Sensitivity

A novel microspheric cocrystal consists of a 1 : 1 molar ratio of CL-20 and 2,4-DNI was synthesized by a spray-drying process, utilizing our self-developed equipment which is more economic, productive and green.

Influence of Diluents on Physical Properties of Soybean Extracted Powder Prepared by Spray Drying Method

2012 ◽  
Vol 506 ◽  
pp. 529-532 ◽  
Author(s):  
P. Sobharaksha ◽  
R. Indranupakorn ◽  
Manee Luangtana-Anan
Keyword(s):  
Physical Properties ◽  
Spray Drying ◽  
Flow Property ◽  
Modified Starch ◽  
Drying Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Phenolic Group ◽  
Selection Of

soflavones, a special phenolic group found in soybean, have been found to act as antioxidant and are widely used in pharmaceutics and nutraceuticals. Due to the storage and handling problem, the extract has been prepared in dry form by spray drying technique. The condition of extract solution prior to spray drying has been reported to affect the property of dried powder. The aim of this work was to evaluate the effect of diluents on the physical properties of soybean extracted powder. The experiment was carried out by a Büchi B-290 Mini Spray Dryer. Four types of diluents were applied, they weremannitol, maltrodextrin, and 2 types of modified starch The comparison was then made among those with diluents and without diluent as a carrier. The physicochemical property was then characterized for flowability, moisture content, morphology, particle size and X-ray diffraction. From the results, the addition of all diluents could improve the physicochemical properties of soybean extracted powder indicating the improvement in morphology and hence the better flow property .The types of diluent also had the effect on the extracted powder. Maltodextrin and modified starch exhibited the best carrier in term of improvement of flow property. Therefore, the spray drying technique was successfully used to prepare microparticles of soybean extracted powder and by taking into consideration of the selection of suitable diluents, the good quality of soybean extracted powder could be achieved.

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