APPLIED ENERGY
·
2023
·
IF 11.2
Tianhua Xue,Daolun Liang,Xuxuan Guo,Yue Jiang,Dekui Shen
Addition of boron nanoparticles to liquid oxygenated fuel lead to the formation of nano‑boron slurries with high energy density. This study focuses on ignition and combustion characteristics of single droplets of nano‑boron slurries during ultrasonic levitation and effects of different oxygenated fuels on ignition and combustion characteristics of single droplets. In this study, nano‑boron slurries of boron/ethanol, boron/1-hexanol, boron/dimethyl carbonate, boron/triacetate, boron/propylene glycol monomethyl ether and boron/tripropylene glycol monomethyl ether with 10 wt% solid loading were prepared. Moreover, an ultrasonic levitation system was designed and established, which was used for igniting single droplets in ultrasonic levitation state. The results indicate that ignition and combustion process of levitated single droplets of nano‑boron slurries can be divided into three stages: a stable endothermic stage, an oscillation and micro-explosion stage and an aerosol combustion stage . Smoke was observed before aerosol combustion stage of boron/triacetate and boron/tripropylene glycol monomethyl ether, whereas flame jets were observed during combustion of other fuels. Furthermore, emission spectra of BO 2 with high intensity could be observed during aerosol combustion stage. A shorter main chain length of oxygenated fuel facilitates ignition of nano-B slurries. Boron/propylene glycol monomethyl ether exhibited shortest ignition delay , which was approximately 13.8% shorter than that of boron/tripropylene glycol monomethyl ether with the longest ignition delay. Furthermore, a longer main chain length of oxygenated fuel facilitates combustion of nano-B slurries. Nano‑boron slurries with longer main chains (boron/1-hexanol, boron/triacetate and boron/tripropylene glycol monomethyl ether) exhibited brighter and larger flames, regardless of whether they were alcohols, esters or ethers, and quenched zones with bright and clearly delineated edges were observed. Intensity integral and maximum intensity of emission of these three fuels were also higher than those of other fuels. Boron/triacetate demonstrated the best combustion performance, with maximum intensity and intensity integral at 547.8 nm being 3.88 times and 1.9 times those of boron/ethanol, respectively, which has the worst combustion performance. This study provides a theoretical basis and experimental reference for the application of oxygenated-fuel-based nano‑boron slurries and their base liquid fuel selection.
研究领域:
能源科学
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燃烧学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2023
·
IF 2.2
Yarui Dong,Jian Xu,Ping Du,Zhongjun Feng,Baicun Zheng
A series of comb polymers poly(2-(dimethylamino)ethyl methacrylate (DMAEMA)-co-methacrylic acid (MAA)-co-methoxy polyethylene glycol methacrylate (MPEGMA)) (poly(DMAEMA-MAA-MPEGMA, DMM) were synthesized and used as N-methyl-2-pyrolidinone (NMP)-based lithium iron phosphate (LFP) suspension dispersants. The effects of the grafting density of the carboxyl group as the anchoring group and the chain length of the side chain of PEG, which plays the role of spatial site resistance, on the rheological properties and suspension stability of the slurry were systematically investigated. By investigating the adsorption amount and thickness of DMM on the LFP surface, combined with calculations based on the scalar law and Flory theory, the molecular structure of the comb polymer dispersant was revealed to influence the adsorption and dispersion performance. The dispersion of LiFePO4 was due to the synergistic effects of adsorption and steric hindrance effect, which resulted that dispersants with medium carboxyl density and PEG side chain length can improve the dispersion performance and stability.
研究领域:
材料科学
·
高分子化学
·
电化学
·
胶体与界面科学
✓ 已验证
DOI
高影响因子
Journal of Water Process Engineering
·
2025
·
IF 6.7
Gongxu Zhang,Zheng Yao,Chenxi Zhang,Shuai Zhang,Helai Cheng
The removal of bound water remains one of the most significant challenges in sludge reduction. As classic predatory microorganisms, myxobacteria, exhibit broad-spectrum predatory activity against various organisms. However, it remains unclear whether myxobacteria can prey on sludge microorganisms and subsequently induce bound water release. This study demonstrates that the application of myxobacteria at different concentrations significantly reduced water content, total suspended solids (TSS), and volatile suspended solids (VSS) in sludge. Notably, the addition of Myxococcus xanthus DK1622 at 200 mg/L achieved a 0.85 % reduction in water content. At this optimal concentration, TSS and VSS decreased by up to 4.58 g/L and 2.29 g/L, respectively. The predation process induced significant changes in extracellular polymeric substances (EPS), with protein and polysaccharide concentrations increasing by 2.3-fold and 1.2-fold, respectively. These alterations were attributed to cellular material leakage during predation, which in turn contributed to EPS accumulation. Furthermore, the disruption of microbial aggregates via predatory activity facilitated the release of bound water from the sludge. These findings provide valuable insights for potential applications of myxobacteria in biological sludge dewatering processes.
研究领域:
环境微生物学
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污水处理
·
生物污泥减量
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
An-Nan Chen,Jia-Min Wu,Huan Xiao,Jing-Yan Chen,Xiao-Yan Zhang,Fen Chen,Yi-Xin Ma,Chen-Hui Li,Qing-Song Wei,Yu-Sheng Shi
A novel rapid, uniform and non-contamination in-situ solidification method for alumina suspension by DCC-HVCI method using MgO sintering additive as coagulating agent was reported. MgO was used to release Mg 2+ in suspensions via reaction with acetic acid generated from glycerol diacetate (GDA) at elevated temperature as well as to improve density and suppress grain growth of alumina ceramics during sintering. Influence of adding 0.7 wt% MgO with 2.0 vol% GDA in alumina suspension on coagulation process and properties of green bodies and sintered samples were investigated. It was indicated that the controlled coagulation of the suspension could be achieved after treating at 70 °C for 10 min. Homogeneous composition distribution of Mg element in EDS result indicated the uniform solidification of suspensions. Compressive strength of wet-coagulated bodies is 2.09±0.25 MPa. Dense alumina ceramics with relative density of 99.2% and flexural strength of 354±16 MPa sintered at 1650 °C for 4 h present homogeneous microstructure. The result indicated that the novel DCC-HVCI method via a sintering additive reaction with no contamination, short coagulation time and uniform in-situ solidification is a promising colloidal forming method for preparing high-performance ceramic components with complex shape.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED ENERGY
·
2014
·
IF 5.261
Xing Li,Ying Chen,Zhengdong Cheng,Lisi Jia,Songping Mo,Zhuowei Liu
Graphene is widely utilized because of its exceptional properties, such as strong mechanical strength, low weight, nearly optical transparency, and excellent conductivity of heat and electricity. In this study, we used the ultrahigh specific surface area of graphene due to its inherently two-dimensional nature to reduce the subcooling of freezing of a phase change material. The results enable graphene’s application in energy storage using the latent heat of phase transition. The need for subcooling to freeze water was eliminated completely with the suspension of a very low mass fraction (0.020 ± 0.001 wt%) or surface area concentration (0.070 ± 0.003 m 2 /ml) of graphene. Compared to nanoparticles of SiO 2 and TiO 2 with the same mass fraction suspended in water, flakes of graphene led to freeze water at a much smaller subcooling degree, and shorter total freezing time. The addition of surfactants can improve suspension stability and further reduce the degree of subcooling, but it also slightly increases the total freezing time. Graphene flakes are more suitable than spherical oxide nanoparticles for use as nucleating additives in water.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL POLLUTION
·
2021
·
IF 8.071
Feiyang Xia,Quanwei Yao,Jun Zhang,Dunqiu Wang
Although microplastics are an emerging pollutant of global concern, little is known about the environmental behavior of microplastic in sediments. This study investigated the occurrence and seasonal variation of microplastics in the sediments of Liangfeng River, China with a fluorescence staining method, and then explored the transfer of microplastics at the water and sediment interfaces during resuspension . The results showed that smaller microplastics were detected in the sediments, which were concentrated in the size range of 50–500 μm. Microplastic abundance in the sediments in the dry season were slightly higher than those from the rainy season, and the rainy season promotes the accumulation of smaller microplastics in the sediment along the river-flow direction but not for the dry season. The shape of microplastics were predominantly fibers, followed by fragments and films. Polyethylene was the most abundant polymer, accounting for more than 50% of the total. Microplastics in the surface sediment move both to the overlying water and deeper sediment during the disturbance process. Disturbance-induced resuspension and vertical transport have significant effects on small-sized microplastics (50–500 μm). Small-sized microplastics can potentially migrate and redistribute via resuspension at different temporal and spatial scales, as some extent of resuspension is occurring in most river systems, especially in urban areas with boat traffic.
研究领域:
环境科学
·
生态学
✓ 已验证
DOI
高影响因子
MINERALS ENGINEERING
·
2025
·
IF 5
Yijiang Li,Xiaoxia Yang,Zhaohua Wang,Wencheng Xia,Feng Wu,Yujin Sun,Xiangyun Sun,Shiqi Liu
This study researched into the underlying influence mechanism of Ca 2+ and Mg 2+ on the rheological properties of kaolinite slurry through rheological technique, turbidity analysis and DLVO theory calculation. The rheological results showed that both the viscosity and yield stress of kaolinite slurry were reduced under high Ca 2+ /Mg 2+ concentration. The apparent viscosity of slurry containing Mg 2+ was lower than that of slurry containing Ca 2+ , but the yield stress of slurry containing Mg 2+ was higher than that of slurry containing Ca 2+ . Turbidity results showed that Ca 2+ have a stronger turbidity removal effect on kaolinite suspension than Mg 2+ . The agglomeration of kaolinite in the presence of Ca 2+ was greater than that in the presence of Mg 2+ . The DLVO theoretical calculation results indicated that there was strong attractive energy between silica face-alumina face, silica face-edge face and edge face-edge face under 1 mmol/L Ca 2+ /Mg 2+ . There were repulsive energy barriers between the silica face-silica face, as well as between the alumina face-alumina face and alumina face-edge face. However, there was an attractive energy between the alumina face-edge face under 1 mmol/L Mg 2+ . The kaolinite agglomeration was a basal face-basal face (F-F) structure with tight and large under 1 mmol/L Ca 2+ , but the kaolinite agglomeration was F-F and edge face-basal face (E-F) structure with loose and large under 1 mmol/L Mg 2+ . The E-F structure in the presence of Mg 2+ caused high yield stress of kaolinite slurry. Under high ions concentration, there was a weak attraction or repulsion between basal faces of kaolinite, but there was an attractive effect between the edge faces. The kaolinite agglomerates were edge face-edge face (E-E) structure with small and even dispersed, resulting in a low viscosity of the slurry. The conclusion of this study provides a basis for regulating the rheological properties of rich-clay slurry during mineral processing.
研究领域:
矿物加工工程
·
胶体化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Zhenkai He,Xinyu Wang,Yunhe Luo,Yazheng Zhu,Xin Lai,Jingge Shang,Jianqiu Chen,Qianjiahua Liao
Coagulation is a common method used to remove suspended particulate matter (SPM) from the water supply. SPM has preferable adsorption ability for antibiotics in water; therefore, SPM adsorption and coagulation may be a possible way to remove tetracycline (TC) from water. This study carried out coagulation experiments combining SPM collected from a natural lake at a location with three common coagulants—polyaluminum sulfate, polyaluminum chloride, and polyferric sulfate—under different pH values, exploring the adsorption of TC by SPM, coagulation of SPM with TC, and the primary influencing factors of this process. The maximum removal rate of TC can reach 97.87% with an SPM concentration of 1000 mg/L. Multi-factor analysis of variance showed the importance of various TC removal factors, which were ranked as follows: SPM concentration ≫ initial TC concentration > type of coagulant > pH values. The higher the SPM concentration, the better the TC removal (p < 0.001). Fourier infrared spectroscopy results demonstrated the strong adsorption effect of SPM on TC after being combined with a coagulant, and scanning electron microscopy also indicated that SPM becomes effective nuclei in the coagulation process, which is a possible reason for better TC removal. However, the effluent turbidities under 1000 mg/L SPM concentrations were high without coagulant aid. With the addition of coagulant aid anion polyacrylamide, the TC removal remained unchanged, effluent turbidity significantly reduced, and the TC desorption became low. These results indicate that applying SPM from natural lakes in the coagulation process could potentially remove TC in water.
研究领域:
环境科学
·
水处理工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Kun Li,Han Tang,Mingke Yang,Xiaowan Peng,Ruihang Zhang,Chun Deng,Yunlei Peng,Bei Liu,Changyu Sun,Guangjin Chen
Separation of light hydrocarbon isomers is always an important and challenging task in the petrochemical industry due to their similar physicochemical properties. This paper presents the absorption-adsorption hybrid method to separate pentane isomers using a flowable zeolitic imidazolate framework-8 (ZIF-8) slurry prepared with N, N′-Dimethylpropylene urea (DMPU) and water. Firstly, the single-component kinetic sorption profiles for n-pentane and iso-pentane in the slurry were measured. It appears significant sorption kinetic differences between the pentane isomers in ZIF-8/DMPU-water slurry. Subsequently, the separation performances for n/iso-pentane gas mixtures were studied systematically. The results show that the selectivity for pentane isomers using ZIF-8/water slurry is extremely high (1877 specifically), and the selectivity decreases gradually when the DMPU content in the solvent increases, while conversely the sorption speed increases rapidly. The selectivity as a function of time was described to graphically characterize the kinetic-based separation for pentane isomers. With excellent behavior in selectivity, sorption speed, sorption capacity (1.10 mol/L for n-pentane in ZIF-8/DMPU slurry), and renewability, this absorption-adsorption hybrid method is of great potential in the separation of pentane isomers.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2020
·Vol. 412
·期 12
·2731-2741
·
IF 3.637
Chen Xuejing,Zhou Xuesi,He Qinghua,He Yonghong,Guan Tian,Feng Guangxia,Wang Bei,Xie Luyuan,Ji Yanhong
A one-step synthesis using the reversed-phase suspension polymerization method and ultraviolet light curing is proposed for preparing the Raman-encoded suspension array (SA). The encoded microcarriers are prepared by doping the Raman reporter molecules into an aqueous phase, and then dispersing the aqueous phase in an oil phase and curing by ultraviolet light irradiation. The multiplexed biomolecule detection and various concentration experiments confirm the qualitative and quantitative analysis capabilities of the Raman-encoded SA with a limit of detection of 52.68 pM. The narrow bandwidth of the Raman spectrum can achieve a large number of codes in the available spectral range and the independence between the encoding channel and the fluorescent label channel provides the encoding method with high accuracy. This preparation method is simple and easy to operate, low in cost, and high in efficiency. A large number of hydrogel-based encoding microbeads could be quickly obtained with good biocompatibility. Most importantly, concentrating plenty of Raman reporter molecules inside the microbeads increases the signal intensity and means the molecular assembly is not limited by the functional groups; thus, the types of materials available for Raman encoding method are expanded. Furthermore, the signal intensity–related encoding method is verified by doping different proportions of Raman reporter molecules with our proposed synthesis method, which further increases the detection throughput of Raman-encoded SA.
Graphical Abstract
研究领域:
材料科学
·
分析化学
·
生物技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RESOURCES CONSERVATION AND RECYCLING
·
2021
·
IF 10.204
Chengqian ZHANG,Daofan TANG,Mingyi CAO,Fu GU,Xiangyu CAI,Xuetao LIU,Zhaoyu CHENG,Philip HALL,Jianzhong FU,Peng ZHAO
Separation is crucial for recycling heavy metals, however, most of the reported processes focus on separating metals from non-metals. Here we propose a magnetic levitation (MagLev) configuration to separate heavy metals from metallic mixtures. The novel configuration is able to levitate substances with specific densities over 5.00 g/cm 3 , while the extant MagLev devices can only handle materials that have specific densities no more than 3.00 g/cm 3 . We mathematically model the proposed MagLev configuration and apply the approach to separate rare earth metals from fluorescent powders as well as indium contents from indium-tin oxide (ITO)/glass mixtures, mechanically processed liquid crystal displays (LCDs) and ITO powder. The results show that the recovery rates of ITO from ITO/glass mixtures are over 95%, the concentrations of indium in separated LCD shreds are doubled (from 912.0 ppm to 1873.1 ppm), and the purities of separated In 2 O 3 from ITO powder are around 90%. The method is controllable and requires no energy or chemical inputs, and it thereby has tremendous prospects in heavy metal recycling.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2017
·
IF 2.589
Mengjiao Zhai,Yongfeng Gong,Xiuyong Chen,Tonghu Xiao,Guoping Zhang,Lianghao Xu,Hua Li
To exploit marine metal materials with antifouling and drag reduction properties, we constructed hydrophobic perfluoroalkoxy (PFA)/nano‑silver (Ag) coatings onto aluminum substrates by suspension flame spray deposition of PFA/AgNO 3 composites. Silver nanoparticles were formed in situ within PFA coating during the suspension flame spraying. The successful construction of PFA/nano-Ag coatings was revealed by field-emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and contact angle measurements, respectively. The additional silver nanoparticles play the significant role in regulating the sliding angle of the PFA-based coatings. The silver nanoparticles-loaded hydrophobic PFA coatings synergistically inhibited the adhesion of bacteria, while only PFA coatings with lower content of silver display drag reduction property. The simple and cost-effective approach is of great promise in mass-production of antifoulant-loaded hydrophobic coatings on general substrates for potential antifouling and drag reduction applications.
研究领域:
材料科学
·
海洋工程
·
生物医学
✓ 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）