ENERGY & FUELS
·
2019
·
IF 3.021
Ying Chen,Baozhong Zhu,Yunlan Sun,Siyi Zhang,Wei Shi,Xuedong Liu
Effects of ammonium perchlorate (AP) particle size on the aluminum (Al) agglomeration in primary combustion of AP/Al binary mixture with a high Al content were investigated experimentally using a CO2 laser ignition apparatus. The combustion of AP/Al binary mixture and Al agglomeration were observed by a high-speed camera. In addition, the particle size distributions and chemical compositions of the condensed combustion products were analyzed by a laser particle size analyzer, X-ray diffraction, and other experimental techniques. Results show that the increase in AP particle size can decrease the size of Al agglomeration, the combustion efficiency of Al powder, the brightness of oxide cap, and the distance from the flame front to the Al droplet but can increase the flame radius. The Al particle burns in evaporation mode, and the rotation phenomenon occurs in the Al droplet. The rotational velocity of the Al droplet decreases with increasing AP particle size. The Al agglomeration can be formed by two ways in the flame zone. For larger Al agglomerations, the spherical molten Al particles first aggregate, then some small aggregates detach from the surface of the big aggregates, and last, the remaining irregular aggregates become regular bigger spherical agglomerations. For small Al agglomerations, the agglomerates directly separate small agglomerations.
研究领域:
化学工程
·
材料科学
·
燃烧科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING RESEARCH & DESIGN
·
2018
·
IF 2.795
Xianni Song,Dong Liu,Bin Lou,Zhiheng Li,Aijun Guo,Dongming Zhang,Luhai Wang
In this study, catalyst particles (the main component is Al 2 O 3 –SiO 2 ) were removed from the fluid catalytic cracking slurry oil by adding a polyacrylamide flocculants (1200 μg/g) and a ammonium citrate aqueous solution weighting agent (10% by weight of the slurry oil) at 95 °C, and then settled for 18 h. The ash content which determined by the muffle stove was considered as a criteria for measuring the efficiency of sedimentation. The size and distribution of the catalyst particles, before and after sedimentation, were analyzed using a laser particle size analyzer and a light transmission microscope. The results showed that the removal efficiency could reach 95.12% when both the flocculants and weighting agent were added. However, either the flocculants or weighting agent applied individually could only obtain inferior removal efficiencies of 87.04% or 68.76%, respectively. It would be attributed to the synergistic effect between the two agents. Moreover, it was also found that the flocs were rapidly formed from original catalyst particles and the flocculants firstly. Then the weighting agent provided assistance for the sedimentation of the flocs, of which the process was identified as the control step. The sedimentation process established in the experiment might play a role in the industrial removal of catalyst particles from slurry oil in the future.
研究领域:
化学工程
·
环境工程
·
石油工程
✓ 已验证
产品关联
DOI
高影响因子
FLOW TURBULENCE AND COMBUSTION
·
2023
·Vol. 111
·期 2
·697-715
·
IF 2.4
Luo Junxiao,Shi Weidong,Chen Liang,Fang Guofeng,Zhang Liang
Nanofluids have become more and more attractive to the modern industry due to their high performance in heat transfer and combustion. As one of the key influencing factors, the atomization mechanism of nanofluids induced by airflow is more complex than that of pure liquids, which has attracted great attention recently. In this study, the spray characteristics of TiO 2 –propylene glycol nanofluids were investigated by focusing on the effects of nano-TiO 2 additives on atomization. On the basis of high-speed shadow imaging, the spray morphology of the base fluid injected from an air atomizing nozzle under different pressures was analyzed first. Then a laser particle size analyzer was used to obtain the droplet size distribution of the nanofluids. The air pressure at the inlet of the atomizer was found to have more contribution to the atomization of nanofluids. And when the air pressure exceeded 0.35 MPa, the Sauter mean diameter (D 32 ) of the base fluid droplets was insensitive to the change of air pressure. Subsequently, the contribution of nanoparticles to atomization was discussed. An empirical correlation was proposed between the Sauter mean diameter (D 32 ) and the dimensionless parameters such as the gas Weber number (We g ), liquid–gas momentum ratio (q), and the volume fraction of nano-TiO 2 , etc. Results indicated that adding nanoparticles enhanced the jet stability by increasing the viscosity at a low jet velocity, while the jet instability was increased due to the nanoparticles promoting the cavitation at a high jet velocity.
研究领域:
热能工程
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机械工程
·
流体力学
·
材料科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF PHARMACEUTICS
·
2024
·
IF 5.3
Yanbo Liu,Xiaolei Wang,Chenyang Zhao,Shuo Wang,Xiaogang Lian,Weiqi Chen,Lei He,Mingyang Chen,Songgu Wu,Junbo Gong
Tenofovir amibufenamide fumarate (TMF) is the first oral drug developed in Asia for the treatment of adult patients with chronic viral hepatitis B, however, further applications are limited by poor tableting performance and high sticking propensity. In this work, the spherulitic growth process of TMF has been designed and explored with the help of molecular dynamics simulation and process analysis technologies (ATR-FTIR, FBRM and EasyViewer). The spherical particles with high bulk density, good flowability and uniform particle size distribution are prepared by a simple quenching process. More importantly, experimental results show that spherical particles have higher average tensile strength (100.8% increase), higher plastic deformability and lower amount of punch sticking (87.4% decrease in 30 tablets) compared to the commercial powder products. These contributions not only shed light on the design principle of drug spherulitic growth processes, but also provide guidance for the manufacture of high-quality tablet products.
研究领域:
药学
·
结晶工程
·
材料科学
·
药物开发
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Saudi Chemical Society
·
2023
·
IF 5.6
Shuang Geng,Ziyao Yu,Run Zhang,Bingyuan Fan,Qian Wang,Jiejie Guang,Shan Wang,Xiang Zhang,Chengchen Hou,Chunying Wang,Kejie Zhang,Wei Meng
Triangular silver nanoplates exhibit excellent optical and catalytic properties in many fields, such as catalysts, sensors and bio-medicine. In this paper, triangular nanoplates were generated just in the presence of sodium citrate through a light-induced ripening process, which were converted from spherical silver nanoparticles by reducing silver nitrate with sodium borohydride. By using UV–Vis spectroscopy, particle size analyzer, transmission electron microscopy (TEM) and Ag + concentration analysis, the effects of precursors during the preparation of triangular nanoplates were systematically investigated and the optimal experimental conditions were determined. Based on density functional theory (DFT), the adsorption energies of citrate ion, malate ion and tartronate ion on Ag (1 1 1), (1 1 0) and (1 0 0) were calculated. In addition, theoretical calculations coupled with experimental observations showed that citrate ion as capping agent could more preferentially bind to Ag (1 1 1) and thus blocked Ag (1 1 1) while only allowing extensive growth along the lateral direction. This well explains sodium citrate is an efficient agent in preparing triangular silver nanoplates.
研究领域:
材料科学
·
纳米技术
·
光学
·
催化
·
传感器
·
生物医学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Mingliang Luo,Xiaodong Si,Mingzhong Li,Yige Huang,Qinpeng Li,Changheng Li
In this study, we designed a magnetic responsive hydrogel, also known as magnetorheological gel (MRG), based on a carbonyl iron particle@polyacrylamide (CIP@PAM) composite and a water-soluble PAM matrix to use as a temporary plugging agent (TPA) in the hydraulic fracturing of unconventional hydrocarbon reservoirs. The CIP@PAM composite was synthesized and characterized by Fourier transform infrared spectrometry (FT-IR), scanning electron microscopy (SEM), laser particle size analysis (LPSA) and vibrating sample magnetometry (VSM). The results show that a thin and uniform PAM layer was successfully coated on the surface of the CIPs, which plays a key role in enhancing the antioxidant capacity of the CIPs. Meanwhile, the CIP@PAM composite possesses a high saturation magnetization (148.8 emu/g). MRG as a TPA has a high gel strength and magnetorheological effect under a magnetic field intensity of 1 T, providing a breakthrough pressure up to 38.13 MPa at room temperature . Compared with the conventional temporary plugging agent, MRG as the temporary plugging agent possesses high magnetic responsiveness to easily control, good degradability and recyclability, providing great potential application in hydraulic fracturing.
研究领域:
材料科学
·
化学工程
·
石油工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）