Article
Chemistry, Physical
Xiao-Fei Yu, Wen-Cui Li, You-Ren Hu, Cheng-Yu Ye, An-Hui Lu
Summary: A new synthesis approach for internal gridded hollow carbon spheres is proposed in this study, which involves constructing a silica fence around solid polymer spheres to create the desired structure. These carbon spheres show good performance as sulfur hosts for Li-S batteries.
Article
Materials Science, Ceramics
Anbang Chen, Lang Li, Weili Ren, Chong Wang, Qingyuan Wang
Summary: In this study, a series of porous ceramics were prepared using different ratios of small and large size hollow ceramic spheres as pore-forming agents. The thermal insulation properties of the porous ceramics were investigated. The results showed that increasing the proportion of small size hollow ceramic spheres effectively decreased the thermal conductivity and improved the compressive strength of the porous ceramics. The optimal porous ceramic had a thermal conductivity of 0.368 W/(m·K) and a compressive strength of 22.43 MPa.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Anbang Chen, Lang Li, Chong Wang, Qingyuan Wang
Summary: The objective of this study is to obtain a low-cost multifunctional porous ceramic material with improved properties. The porous ceramics were fabricated using magnesia-aluminum spinel hollow spheres and the effects of firing temperature on thermal conductivity, porosity, and mechanical strength were investigated. The results showed that the ceramics had high porosity, thermal conductivity, and compressive strength, mainly due to the change in crack directions and microstructure optimization with the increase in firing temperature.
PROGRESS IN NATURAL SCIENCE-MATERIALS INTERNATIONAL
(2022)
Article
Chemistry, Physical
Tingfei Lou, Shizhu Song, Xiaohong Gao, Wenjing Qian, Xiaolei Chen, Qi Li
Summary: Hollow carbon sphere (HCS)-supported titanium dioxide (TiO2) nanoparticles (sub-20-nm; HCS@TiO2)-based composites were designed and fabricated to improve the separation efficiency of photogenerated electron-hole pairs and enhance the adsorption performance of organic pollutants, achieving efficient photocatalytic degradation.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Engineering, Environmental
Baoxin Fan, Lu Xing, Qianmei He, Fanjie Zhou, Xiaofen Yang, Tong Wu, Guoxiu Tong, Dongmei Wang, Wenhua Wu
Summary: This study presents a method to prepare ultrathin carbon nitride hollow structures using a salt-assisted freeze-drying and calcining strategy. The structure of the hollow structures can be modulated by changing the salt type, precursor/salt mass ratio, and calcining temperature. The results show that the ultrathin hollow micro-polyhedrons have high conductivity and permittivity, contributing to enhanced absorption and impedance matching.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Materials Science, Multidisciplinary
Shuo Chen, Yuehui Chen, Yun Zhao, Liang Zhang, Chuang Zhu, Yuanyuan Zhang, Shujie Liu, Shuhui Xia, Jianyong Yu, Bin Ding, Jianhua Yan
Summary: Oxide ceramic microfibers with unique thermal and electrical properties have potential applications in advanced high-tech fields. This review summarizes the development status, flexibility mechanisms, fabrication methods of oxide ceramic MNFs, and proposes future development directions.
Article
Materials Science, Ceramics
Zhongning Xiang, Qinchuan He, Yiqun Wang, Xuemin Yin
Summary: The microscopic morphology and structure design of absorbent materials are crucial for microwave absorption. This study prepared hollow porous SiC spheres (HPSS) using self-assembly technology and in-situ reaction. The results demonstrated that the temperature could control the particle size and shell thickness of HPSS, and the special hollow porous structure greatly influenced the absorption properties. Different temperatures resulted in different electromagnetic wave absorption properties of HPSS, with a temperature of 1550 degrees C achieving the best performance. The excellent absorption property was attributed to the synergistic effect of good impedance matching and strong dielectric loss.
CERAMICS INTERNATIONAL
(2022)
Article
Engineering, Marine
Shengxia Sun, Min Zhao
Summary: A numerical method was developed to simulate the chain-reaction implosions of multiple ceramic pressure hulls in deep-sea environment. The method used a compressible multiphase flow model and adaptive mesh refinement to determine the implosion trigger conditions. Experimental results verified the accuracy of the fluid solver based on compressible multiphase flow theory. The computation results showed that the air cavity in a spherical pressure hull diffused the expansion wave and triggered chain-reaction implosions.
Article
Engineering, Ocean
Lin Lu, Kaimin Chen, Dongxiao Zhang, Zhe Yang, Yanxiao Hu, Cisong Gao
Summary: This study investigates the oblique water-entry process of a high-speed cylinder under different ice-hole diameter conditions. The influence of the ice-hole constraint on the cavity evolution process is studied in three stages. Results show that the ice-hole diameter affects the cavity expansion and the curvature of the left side profile. The liquid near the water-entry point generates a reflective flow. The impact of the reflective flow delays the surface closure of the cavity. A local impact collapse occurs under a smaller ice-hole diameter, while a folded cavity wall is observed under a larger ice-hole diameter.
APPLIED OCEAN RESEARCH
(2023)
Article
Chemistry, Multidisciplinary
Sharon Hayne, Shlomo Margel
Summary: A simple process was developed to prepare durable thin coatings composed of polystyrene (PS) core, PS/SiO2 core-shell, and hollow SiO2 micro/nanoparticles onto PP and PET films. The coated films can be used for various applications, such as magnetic coatings, superhydrophobic coatings, and solidification of oil liquids within the hollow porous SiO2 coating. The coatings were characterized by E-SEM, FTIR/ATR, and AFM.
Article
Chemistry, Physical
Dinh Chuong Nguyen, Thi Luu Luyen Doan, Sampath Prabhakaran, Duy Thanh Tran, Do Hwan Kim, Joong Hee Lee, Nam Hoon Kim
Summary: The Co and Nb dual-doping strategy modifies the electronic structure of MoS2, enhancing the efficiency of the Co,Nb-MoS2/TiO2 HSs catalyst for hydrogen evolution, oxygen evolution reaction, and oxygen reduction reaction. The unique hollow spherical structure and synergistic effects between TiO2 core and MoS2 shell provide effective channels for electron transfer and facilitate ion diffusion.
Article
Materials Science, Multidisciplinary
Elahe Pourakbar, Esmail Sharifzadeh
Summary: In this study, HO Janus (HOJ) micro- and nanoparticles were synthesized through buoyancy-induced desymmetrization process, and their effects on the thermal conductivity of binary polymer blends were investigated. The results showed that the presence of HO micro- and nanoparticles could increase the conduction coefficient of the blends, while their simultaneous presence in both phases had a significantly more impact on the thermal conductivity.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Engineering, Environmental
Wei Fan, Jingyu Cui, Qi Li, Yang Huo, Dan Xiao, Xia Yang, Hongbin Yu, Chunliang Wang, Peter Jarvis, Tao Lyu, Mingxin Huo
Summary: The novel visible light photocatalytic water disinfection technology coupled with micro/nano bubbles (MNBs) demonstrated superior efficiency in inactivating bacterial spores. Reactive species such as H2O2 and center dot OH were identified as the primary active species responsible for spore inactivation. The mechanism of MNB technology enhancing photocatalytic reaction was also explored, providing new insights for advanced water treatment.
Article
Mechanics
Wei Zhang, Yuan-ding Wang, Wei-feng Li, Hai-feng Liu, Fu-chen Wang
Summary: This study investigates the behavior of microscale particles in a microchannel using microfluidic technology. The research reveals different particle accumulation behaviors, including particle chain mode and particle cluster mode, in steady engulfment flow and vortex shedding flow. Perturbations in particle trajectories induced by vortex shedding flow or particle-particle interactions contribute to particle release.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2022)
Article
Engineering, Marine
Shengxia Sun, Fenghua Chen, Min Zhao
Summary: Pressure hulls are crucial for deep-sea underwater vehicles, but they are susceptible to implosion, a highly destructive phenomenon in ultra-high pressure environments. In this study, compressible multiphase flow theory, direct numerical simulation, and adaptive mesh refinement were employed to simulate the underwater implosion of single and multiple ceramic pressure hulls. The feasibility of the simulation method was verified, and the flow field characteristics of hollow ceramic pressure hulls at a depth of 1100 meters were analyzed. The implosion process involved compression-rebound of the internal air cavity, generating a shock wave with a pressure peak several times higher than ambient pressure. The shock wave's pressure exhibited a negative exponential relationship with the distance from the center of the sphere. Additionally, a chain-reaction implosion revealed a superimposed effect between the spheres, enhancing the implosion shock wave.
JOURNAL OF OCEAN ENGINEERING AND SCIENCE
(2023)
Article
Engineering, Chemical
Ri Zhang, Shasha Zhang, Mengyan Ding
Summary: A thin liquid film method is proposed to evaluate sand erosion in annular flow. This method considers the direct interaction between the liquid film and gas core, as well as the entrainment and deposition of droplets. The erosion rate is calculated by considering the effects of liquid entrainment and particle velocity decay. The method is fully verified by comparing with experimental data.
Article
Engineering, Chemical
Yu Suo, Xianheng Su, Wenyuan He, Xiaofei Fu, Zhejun Pan
Summary: This research investigates the mechanical properties of sandstone-shale composite through orthogonal experimental method and discrete element simulation. The results show that different lithologies and thickness ratios can affect the strength and fracture mode of the composite rock samples.
Article
Engineering, Chemical
Maurizio Troiano, Andrea El Hassanin, Roberto Solimene, Alessia Teresa Silvestri, Fabrizio Scala, Antonino Squillace, Piero Salatino
Summary: This study investigates the potential of Fluidized Bed Finishing (FBF) for square flat AlSi10Mg specimens manufactured via Laser-Powder Bed Fusion (L-PBF) additive manufacturing technology. The results show that good finishing can be achieved using rotation-assisted tests, with a maximum reduction of surface roughness by 67%. Steel particles are found to be the most effective bed material.
Review
Engineering, Chemical
Ningbo Song, Wanzhong Yin, Jin Yao
Summary: Seawater's dissolved salts and minerals have various effects on the flotation process, including influencing the characteristics and behavior of flotation factors, as well as affecting the surface of sulfide minerals. In most cases, seawater has adverse effects on the flotation of sulfide minerals, but these effects can be mitigated by adjusting the reagents.
Article
Engineering, Chemical
Kaiqiao Wu, Shuxian Jiang, Victor Francia, Marc-Olivier Coppens
Summary: In rectangular and cylindrical annular fluidized beds, pulsating gas flow can create regular bubble patterns, overcoming challenges seen in conventional units. This study provides new opportunities for modularization of fluidized bed operations.
Article
Engineering, Chemical
Shuo Li, Huili Zhang, Jan Baeyens, Miao Yang, Zehao Li, Yimin Deng
Summary: The paper assesses the behavior of cohesive Geldart C-type particles when fluidized by air with the aid of vibration. It determines that mechanical vibration is a simple and effective method to improve the fluidity of cohesive particles during fluidization.
Article
Engineering, Chemical
Zhenfei Feng, Qingyuan Zhang, Shanpan Liang, Zhenzhou Li, Fangwen Guo, Jinxin Zhang, Ding Yuan
Summary: A new micro/mini-channel heat sink (MCHS) with a combined structure of longitudinal and transverse vortex generators is designed, using Al2O3 nanofluid as the working medium. The study explores the effects of transverse vortex generator shape and longitudinal vortex generator angle on the hydraulic and thermal characteristics, comprehensive performance, entropy generation, and exergy efficiency. The results show that the triangular transverse vortex generator improves the comprehensive performance and exergy efficiency. Combined with the longitudinal vortex generator, the MCHS achieves the best comprehensive performance, entropy generation, and exergy efficiency when the Reynolds number is 742.
Article
Engineering, Chemical
Kostas Giannis, Christoph Thon, Guoqing Yang, Arno Kwade, Carsten Schilde
Summary: This study presents a 3D convolutional neural network (3D-CNN) methodology for generating realistic 3D models of particles. The method trains on 2D projections of particle images to predict their 3D shapes, and evaluates the accuracy of the predictions using Fourier shape descriptors (FSDs). This methodology has wide applications in particle shape analysis.
Article
Engineering, Chemical
Zheng-qing Zhou, Lu-jia Chai, Yu-long Zhang, Ya-bin Wang, Ze-chen Du, Tian-yi Wang, Yu-zhe Liu
Summary: The dynamic oxidation and shell-breaking processes of aluminum nanoparticles (ANPs) during heating were studied using in situ transmission electron microscopy. The results revealed that the changes in shell thickness can be divided into three stages, and the active aluminum content of ANP decreased before shell-breaking.
Article
Engineering, Chemical
Fulei Chen, Huaqing Ma, Zihan Liu, Lianyong Zhou, Yongzhi Zhao
Summary: A particle breakage model based on the particle replacement scheme, using the polyhedral model to describe particles, is proposed in this work to accurately describe the breakage of a large number of particles. Additionally, a fast-cutting algorithm is proposed to reproduce the size distribution of progeny particles determined by the breakage model. The validation and simulation results show satisfactory accuracy, efficiency, and stability of the algorithm.
Review
Engineering, Chemical
Matteo Errigo, Christopher Windows-Yule, Massimiliano Materazzi, Dominik Werner, Paola Lettieri
Summary: Gas-solid fluidized-bed systems have advantages in terms of chemical reaction efficiency and temperature control, making them widely used in industrial applications. However, the design, scale-up, and optimization of these complex units are limited by the lack of deep physical understanding. Non-invasive and non-intrusive diagnostic techniques provide a way for researchers to study these systems without affecting the flow field or directly contacting the medium under study.
Article
Engineering, Chemical
Saeed Fateh, Mohammad Behshad Shafii, Mohammad Najafi, Cyrus Aghanajafi
Summary: Applying a magnetic field to ferrofluids alters their flow characteristics and enhances heat transfer. Through visualization and quantitative investigation, it is found that the magnetic field influences the flow patterns and velocity profiles, improving fluid mixing and vorticity magnitude.
Article
Engineering, Chemical
Lei Gao, Bingbing Wei, Xiaochuan Hu, Zaifeng Yao, Yiwen Fang, Xuejian Gao
Summary: In this study, a numerical model of sand triaxial test was established using discrete element software PFC3D, and an indoor triaxial test was conducted to calibrate the numerical model. The influence of microscopic parameters on the macroscopic mechanical response of sand was analyzed. The results showed that the friction coefficient had the greatest impact on the peak strength and residual strength of the sand's stress-strain curve, and it was positively correlated. The normal tangential stiffness ratio was negatively correlated, while the porosity and boundary flexibility stiffness had minimal influence on it.
Article
Engineering, Chemical
Xuan Liu, Jie Gong, Kai Jiang, Xiaojuan Lai, Yu Tian, Kang Zhang
Summary: This study aimed to improve the performance of lignite coal water slurries (CWSs) by synthesizing a series of three-arm amphiphilic block copolymers. By controlling the relative molecular weight, hydrophilic/hydrophobic ratio, and ionic group content, the apparent viscosity of CWSs was significantly reduced and the static stability was improved. Thermogravimetric testing and XPS analysis were conducted to reveal the mechanism behind the improved performance.
Article
Engineering, Chemical
Lanka Dinushke Weerasiri, Daniel Fabijanic, Subrat Das
Summary: Fluidization at low pressure offers significant benefits for the fine chemical industry. This study investigates the behavior of bubbles and bed expansion under low pressure conditions. It is found that lower pressure leads to larger bubbles, increased bubble quantity, and higher aspect ratio. The predictability is affected by the inhomogeneous fluidization, but low pressure fluidization can generate similar bubble sizes with lower fluidizing mass compared to atmospheric pressure.