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
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
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
AQUACULTURE
·
2023
·
IF 4.5
Jietao Liu,Shenye Qu,Tao Wang,Bin Yang,Xiang Liu,Gaoxue Wang,Pengfei Li,Qing Yu,Fei Ling
Natural products have gained recognition as a valuable resource and have significant implications in the field of aquaculture. Nevertheless, the limited water solubility of drugs, leading to compromised bioavailability, has been a persistent challenge in the realm of pharmaceutical research. Magnolol as a natural product, the low solubility leads to limited activity against Ichthyophthirius multifiliis , which severely limits the application of magnolol. Nanosuspensions are considered to be an important strategy to improve the solubility and bioavailability of insoluble drugs. The purpose of this study is to fabricate nanosuspensions that can effectively improve the solubility and antiparasitic activity of magnolol. Magnolol nanosuspensions (MNs) containg Pluronic F68 as a stabilizer was prepared by the solvent-antisolvent precipitation method. The results of TEM , DSC and FTIR analysis showed that the surfactant attached to the surface of magnolol, and the nanosuspensions process significantly reduced the crystallinity and improved the solubility and dissolution rate of magnolol. The Central Composite Design was adopted to investigate the effects of independent variables viz. amount of temperature (A), the ratio of pluronic F68 to magnolol ( w /w) (B), and churning time (C) on particle size (Y), obtaining optimum nanosuspensions with a size of 32.03 nm. Compared with free magnolol, the release rate of magnolol in 119 nm and 35 nm MNs was significantly improved, and the release rate of magnolol was increased from 28.13% to 58.45% and 85.70% within 60 min. Further, the antiparasitic activity of MNs was measured. The results showed the reduction in drug particle size leads to an enhancement in the insecticidal activity of magnolol. Altogether, this study proposes a promising strategy to enhance activity by increasing the solubility of natural products.
研究领域:
水产养殖
·
药剂学
·
天然产物研究
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Wenjing Zou,Ping Yang,Lifu Lin,Yehua Li,Shanghua Wu
Silicon nitride (Si 3 N 4 ) slurries with high solid loading, low viscosity and good stability is difficulty prepared, due to low intrinsic surface charge and a large refractive index (RI) difference between Si 3 N 4 powder and resin. In this paper, the curing behavior of Si 3 N 4 slurry with different functional group and RI of resin monomer were systematically researched, and then the kind and optimum content of dispersant were investigated. Subsequently, a high solid loading Si 3 N 4 slurry (44 vol%) with good curing behavior, low viscosity and favorable stability was successfully prepared. Lastly, the dense Si 3 N 4 ceramic parts were fabricated by the suitable Si 3 N 4 slurry (44 vol%) via stereolithography . After debinding and sintering process , the relative density and flexural strength of Si 3 N 4 ceramic were 98.28% and 800 ± 27.28 Mpa, respectively.
研究领域:
材料科学
·
制造工程
✓ 已验证
DOI
高影响因子
Nano Energy
·
2024
·
IF 16.8
Yunpeng Zhu,Bin Luo,Xuelian Zou,Tao Liu,Song Zhang,Mingchao Chi,Yupei Sun,Keyang Jiang,Ling Liu,Fanzhen Meng,Shuangfei Wang,Shuangxi Nie,Zhiwei Wang
The stability of suspensions is critical to the smooth operation of the entire production system, especially during material storage, transportation and production. Nevertheless, the challenge of achieving cost-effective and real-time online monitoring remains, owing to the variability in the particles size and concentration. In this study, a triboelectric probe integrated with deep learning technology were employed to achieve self-powered, real-time, online monitoring of the particles size and concentration, whose variations would influence the distribution of surface charges, thereby inducing changes in the macroscopic dielectric constant of the suspension. Such triboelectric probes successfully captures output signals that reflect changes in the properties of the suspension, based on the coupled effects of contact electrification and electrostatic induction at the liquid-solid interface. Furthermore, a convolutional neural network model within deep learning technologies were established for handling the relevant signals, and performed an average recognition accuracy exceeding 98% for both the particles size and concentration. The integration of the triboelectric probe and deep learning technology presents a novel approach for real-time online monitoring of particles, holds significant implications for the production security monitoring in industries such as pharmaceuticals, chemical engineering , and food production.
研究领域:
工业监测
·
化学工程
·
制药工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Yaode Li,Yanyu Wu,Sannan Zhang,Cong Qi,Zhiguo Zhang
Nanoparticles can improve the heat transfer effect of fluids, however, they are difficult to dissolve in the base fluid and are prone to fouling, agglomeration and sedimentation during flow, which affects their efficient heat transfer characteristics. In this paper, the inhibitory effect of high-voltage electric field on the agglomeration and deposition of TiO 2 nanoparticles in suspension was comparatively studied by comprehensive gravity sedimentation, spectrophotometer, particle size analysis, and zeta potential method. Studies have shown that the absorbance of suspensions is basically the same in neutral and acidic environments. However, in a highly alkaline environment, the agglomeration rate of nanoparticles increases significantly, resulting in a decrease in the absorbance of the suspension. The high-voltage non-uniform electric field generated by the active Cu rod electrode can effectively inhibit the agglomeration of TiO 2 nanoparticles. However, the suppression effect of an external electric field is not necessarily the higher the voltage, the better. Different nanomaterials have different critical voltages. The high-voltage electric field of 1 kV has the best inhibitory effect on the agglomeration and deposition of TiO 2 nanoparticles. An in-depth analysis of the mechanisms of the movement and agglomeration of TiO 2 particles in suspension under high-voltage electric field excitation was conducted. The result shows that the agglomeration and sedimentation of particles in suspension depend on the Zeta potential of the nano particles. The higher the absolute value, the more stable the dispersion system is.
研究领域:
材料科学
·
热物理学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Current Drug Delivery
·
2021
·Vol. 18
·期 2
·224-233
·
IF 2.565
Xie Shuyu,Zhang Xiaoqiu,Luo Wanhe,Meng Kuiyu,Chen Dongmei,Pan Yuanhu,Tao Yanfei,Huang Lingli,Liu Zhenli,Wang Yulian,Yuan Zonghui
Objective: A ceftiofur hydrochloride long-acting oily suspension with no irritation was prepared by testing and optimizing the types and amounts of organic solvents, suspending agents, and surfactants. Methods: Its properties, stability, injection site irritation, in vitro
release, and pharmacokinetics in pigs were evaluated. The optimum formulation was used ethyl oleate, aluminum monosterate, and span-80 as organic solvents, suspending agents, and surfactant, respectively. The drug microparticles were uniform long strip with size of 1.53 ± 0.11 μm
and no agglomerations, and were evenly dispersed. The re-dispersed time, sedimentation rate and pH value of the suspension were 4 s under a magnetic shaker rotating at 20 r/min, 1 and 5.0, respectively. It could go through 7-gage needle smoothly with withdrawal volume of 9.9 mL/min. Results:
The suspension showed good stability when stored away from light, no irritation at the injection site and sustained release in PBS buffer. After intramuscular administration, the drug concentration above 0.15 μg/mL was last for 120 h. Its elimination half-life (T1/2ke), mean
residence time (MRT), and bioavailability were increased by 1.73, 1.62, and 2.16 times compared to Excenel®. Conclusion: The results suggested that the suspension had excellent sustained-release and will make ceftiofur hydrochloride more effective and convenient to use.
研究领域:
兽医学
·
药物制剂
·
药理学
✓ 已验证
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2016
·
IF 2.758
An-Nan Chen,Jia-Min Wu,Meng-Yue Liu,Li-Jin Cheng,Jing-Yan Chen,Huan Xiao,Xiao-Yan Zhang,Chen-Hui Li,Yu-Sheng Shi
Rapid in-situ solidification of SiO 2 suspension under the joint action of releasing calcium ions and shifting pH has been proposed. When the suspension was heated up to 60 ℃, decomposition of calcium iodate which released calcium ions , as well as hydrolysis of diacetate (GDA) which shifted the pH toward the isoelectric point, both contributed to the solidification of suspension. The controlled coagulation of SiO 2 suspension could be realized via controlled release of high valence counter ions and pH shift at 60 ℃ within 30 min, which could considerably shorten the coagulation time compared with present reported results (1–3 h). Green body prepared by heating the SiO 2 suspension with 6.5 g L −1 calcium iodate and 2.0 vol% GDA at 60 ℃ for 30 min shows uniform microstructure with compressive strength of close to 0.3 MPa. SiO 2 ceramics sintered at 1275 ℃ for 3 h possess homogeneous microstructure with bulk density of 2.06 g cm −3 and flexural strength of 40.3 MPa.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2022
·
IF 4.432
Bingxiu Xue,Fang He,Qi Lei,Xiaopeng Zhao,Jianbo Yin
Backbone, pendant and cross-linked poly(ionic liquid) (PIL) particles with the same ion pair and similar ion number density have been prepared and the electro-responsive electrorheological (ER) effect of their suspensions in insulating carrier liquid has been comparably studied by rheology and dielectric spectroscopy . It has found that the ER effect of cross-linked PILs is strongest and that of backbone PILs is weakest. Dielectric spectrum analysis has showed that the difference of ER effect is mainly due to the difference in the ion leakage and effective interfacial polarization of PIL particles under electric fields. Although the backbone PILs have the largest interfacial polarization strength , its ion leakage conductance is also largest and this results in its weakest ER effect. The cross-linked PILs well restrains the ion leakage conductance and the ER effect is largely enhanced. The difference in ion leakage conductance and ER effect is further related to the difference of PIL matrix structure according to X-ray diffraction characterization. This study clarified the influence of matrix structure on ER effect and dielectric polarization of PILs and provided a guidance for the design of PIL ER materials.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
Gels
·
2022
·Vol. 8
·期 11
·722
·
IF 4.432
Shenglong Shi,Jinsheng Sun,Kaihe Lv,Jingping Liu,Yingrui Bai,Jintang Wang,Xianbin Huang,Jiafeng Jin,Jian Li
To overcome the problems of long dissolution time and high investment in surface facilities of powder thickeners in hydraulic fracturing, a novel suspension of a thickener as a fracturing fluid was prepared using powder polyacrylamide, nano-silica, and polyethylene glycol by high-speed mixing. The suspension and powder were compared in terms of properties of solubility, rheological behavior, sand carrying, drag reduction, and gel breaking. The results showed that the suspension could be quickly diluted in brine within 5 min, whereas the dissolution time of powder was 120 min. The suspension exhibited better performance in salt resistance, temperature resistance, shear resistance, viscoelasticity, sand carrying, and drag reduction than powder. The powder solution was broken more easily and had a lower viscosity than suspension diluent. These improvements in properties of the suspension were due to the dispersion of nano-silica in the polymer matrix; the mobility of thickener chains was inhibited by the steric hindrance of the nano-silica. Nano-silica particles acted as crosslinkers by attaching thickener chains, which strengthened the network structure of the thickener solution. The presence of hydrogen bonds between the thickener matrix and the nano-silica restricted the local movement of thickener chains, leading to a stronger spatial network. Therefore, this novel suspension showed good potential for fracturing applications.Keywords:hydraulic fracturing;suspension;nano-silica;powder thickener;network structure
研究领域:
石油工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）