Article
Chemistry, Physical
L. Savio, K. B. Bhavitha, G. Bracco, G. Luciano, D. Cavallo, G. Paolini, S. Passaglia, G. Carraro, L. Vattuone, R. Masini, M. Smerieri
Summary: The study investigates highly hydrophobic aluminium surfaces fabricated by chemical etching using Contact Angle Goniometry, Scanning Electron Microscopy, and X-ray Photoelectron Spectroscopy to correlate wettability with morphology and chemical composition. The etched aluminium surfaces exhibit binary structures with nanoscale block-like convexities and hollows, providing more space for air trapping. Results demonstrate that both hierarchical micro/nanostructures and surface composition contribute to excellent hydrophobic properties.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Andrew Vidler, Olivier Buzzi, Stephen Fityus
Summary: This study found that increasing the content of hydrophobic particles can reduce the saturation of materials, making the water retention behavior closer to coal mine wastes for soils that are more hydrophobic. However, the experiments on rocks and coal mine wastes showed different water retention characteristics, possibly due to the dual hydrophilic and hydrophobic behavior exhibited by coal mine wastes. Further research is needed to understand the discrepancy, which may be caused by an unknown coal-water phenomena.
APPLIED SCIENCES-BASEL
(2021)
Article
Energy & Fuels
Yumeng Chen, Baonan Zhou, Xurui Zhang, Siyuan Yang, Wei Huang
Summary: Kerosene can enhance the hydrophobicity of coal and the bubble attachment capacity, showing more pronounced outcomes when present on both surfaces. At a microscopic scale, kerosene promotes the kinetics of film thinning, but does not cause film rupture due to attractive disjoining pressure.
Article
Chemistry, Multidisciplinary
Daniel J. Braconnier, Terence Davidovits, Randall M. Erb
Summary: Superhydrophobic coatings are often fragile and easily lose their properties when subjected to droplet impact. This paper systematically studies ten different self-similar superhydrophobic coating approaches to understand why some coatings are more robust against hydrodynamic wear. The study finds that coatings with robust apolar chemistry, hierarchal topography, and slow loss of sacrificial material are more resilient against rapid droplet impacts. A quantitative approach to hydrodynamic wear of self-similar superhydrophobic coatings is proposed.
Article
Materials Science, Coatings & Films
Shafarina Azlinda Ahmad Kamal, Richard Ritikos, Saadah Abdul Rahman
Summary: The study found that increasing the annealing temperature can enhance the water repellence of carbon nitride nanostructures, significantly increasing the contact angle from 102.8° to 158.1° and greatly reducing the contact angle hysteresis. The film annealed at 700°C showed excellent durability performance, maintaining its super-hydrophobic behavior even after being subjected to more than 10 water droplets.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Biochemistry & Molecular Biology
Yitong Ma, Pei Tian, Malayphone Bounmyxay, Yiwen Zeng, Nong Wang
Summary: This paper prepared spherical calcium carbonate particles and deposited nanoscale spherical silica on their surface to form a composite material with a micro-nano complex structure and hydrophobicity. The modified CaCO3@SiO2 composite showed good superhydrophobicity with high contact angle. The influence of material roughness on its hydrophobicity was studied using the Cassie model theory.
Article
Engineering, Multidisciplinary
Zhiniu Xu
Summary: The drop area method can be used to characterize the hydrophobicity of materials, with varying effects under different drop conditions. The sensitivity of the method is influenced by the contact angle, drop volume, and liquid parameter. The drop area method is suitable for cases with small contact angles and relatively higher drop volume and liquid parameters.
Article
Engineering, Chemical
Cyril T. O'Connor
Summary: This paper investigates the impact of hydrophobicity of mineral particles in the flotation process, the adsorption characteristics of alkyl chains on mineral particles, and the concept of non-ideal mixtures. The study demonstrates a strong linear relationship between the partial molar excess Gibbs energy of alkyl chains and flotation recovery and contact angle.
MINERALS ENGINEERING
(2021)
Article
Chemistry, Physical
Paria Naderi, Benjamin Raskin Sheuten, Alidad Amirfazli, Gerd Grau
Summary: Inkjet-printed micro-patterns on hydrophobic surfaces have potential applications in microscale device fabrication. A sequential printing and drying method was proposed to form micro-patterns and control their shape, overcoming the challenge of low wettability. An energy minimization technique and gradient descent method were utilized to predict and simulate the shape of inkjet-printed micro-patterns and ensure smooth edges. This study provides insights into the formation of micro-patterns on low wettability surfaces.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Environmental Sciences
Jianping Wei, Wan Jiang, Leilei Si, Xiangyu Xu, Zhihui Wen
Summary: This study compares the wettability differences of different surfactants on coal by measuring and calculating the contact angle and its decay rate. The results show that OP-10 has the strongest wetting modification effect on coal and exhibits a larger capillary force with coal, which may be helpful for coal seam water injection and dust prevention.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Review
Engineering, Multidisciplinary
Jihui Zhao, Xuan Gao, Siying Chen, Houquan Lin, Zhihao Li, Xiaojie Lin
Summary: This paper reviews the progress and applications of hydrophobic or superhydrophobic modification of cement-based materials, analyzes the mechanisms of hydrophobic modification, and discusses the methods and issues in the current research.
COMPOSITES PART B-ENGINEERING
(2022)
Article
Chemistry, Physical
Ashish Kumar Singh, Bhawna Chugh, Manjeet Singh, Sanjeeve Thakur, Balaram Pani, Lei Guo, Savas Kaya, Goncagul Serdaroglu
Summary: This study presents the synthesis and evaluation of four environmentally benign corrosion inhibitors on mild steel in hydrochloric acid medium, using various experimental and microscopic techniques, as well as complementing wet-chemical experimental outcomes with results from ab initio DFT study and MD simulation for further analysis of surface characteristics. The MD simulation outcomes provide visualization of interaction and adsorption of inhibitors on the Fe (110) surface.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Materials Science, Ceramics
Linda Silvia, Yuniar Mughayyirah, Mochamad Amilia, Sudarsono, Mochamad Zainuri, Darminto
Summary: In this study, silica-based methyltrimethoxysilane (MTMS) and SiO2 with different concentrations of cetyltrimethylammonium bromide (CTAB) were prepared by sol-gel method. The addition of CTAB resulted in larger particle sizes and a shift in peak diffractions. Coating the samples on steel plate substrates increased surface roughness, and water contact angle (WCA) increased with higher CTAB content.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Lipeng Wang, Tian Qiu, Zhimin Guo, Xiaofeng Shen, Jianguo Yang, Yuling Wang
Summary: The study on the changes and migration of coal-derived minerals during the graphitization process of Taixi anthracite shows that temperature plays a crucial role in mineral migration. With increasing temperature, minerals gradually move from the inside of anthracite to cracks, with most elements escaping in the form of oxides at ultrahigh temperatures.
Article
Construction & Building Technology
Fatih Dogan, Heydar Dehghanpour
Summary: The study compared the hydrophobic properties of cementitious mortar surfaces coated with silicone-based TiO2, ZnO, and recycled nano carbon black (RNCB) filled composites, and evaluated the surface performance through various tests. The results showed that uniform distribution of particles on the surface, with the quantity of TiO2 and ZnO particles in the crystalline phase being important factors in crystallite sizes and lattice strain. The hydrophobic properties of RNCB particles on cementitious material surfaces are thought to be crucial in reducing wettability.
JOURNAL OF BUILDING ENGINEERING
(2021)
Article
Energy & Fuels
Guangxi Ma, Xiangning Bu, Guangyuan Xie, Yaoli Peng, Jie Sha, Wencheng Xia, Erdong Wu
Summary: This study compared the performance of spiral separators and DMCs in separating fine coal, showing that DMCs outperformed in terms of combustible recovery and yield.
INTERNATIONAL JOURNAL OF COAL PREPARATION AND UTILIZATION
(2021)
Article
Energy & Fuels
Jiakun Tan, Long Liang, Wencheng Xia, Yaoli Peng
Summary: This study found that fine coal particles can increase the recovery rate of coarse coal, with the effect varying depending on the density fraction and mixing ratio. By analyzing various parameters, two mechanisms were proposed to explain how fine coal particles enhance coarse coal recovery, with hydrophobic and hydrophilic particles affecting different aspects of froth stability and water drainage in the flotation process.
INTERNATIONAL JOURNAL OF COAL PREPARATION AND UTILIZATION
(2021)
Article
Energy & Fuels
Yuqiang Mao, Wencheng Xia, Yaoli Peng, Li Pan, Guangyuan Xie
Summary: The impacts of ultrasonic pretreatment on flotation of lignite particles of different size fractions were investigated in this study. The results showed that ultrasonic pretreatment significantly improved the combustible matter recovery of coarse particles, while decreasing the recovery of fine particles. The pretreatment caused more breakage in the 0.125-0.074 mm size fraction compared to other fractions. Additionally, ultrasonic pretreatment removed high ash minerals and reduced pore/cracks, thereby increasing the hydrophobicity and floatability of lignite.
INTERNATIONAL JOURNAL OF COAL PREPARATION AND UTILIZATION
(2022)
Article
Energy & Fuels
Guangxi Ma, Jialin Qiang, Xiangning Bu, Yaoli Peng, Wencheng Xia, Chao Ni, Guangyuan Xie
Summary: The study demonstrates that adding dilution water in the pulp zone of a flotation column can improve separation performance by reducing ash content and concentrate yield. The optimal dilution water flow rate should be around 0.18 cm/s, and positioning the dilution water closer to the bottom of the column enhances separation efficiency. Compared to a conventional flotation column, the use of dilution water results in similar pulp concentration in the pulp zone and better separation performance.
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2021)
Article
Chemistry, Physical
Wencheng Xia, Feng Wu, Soni Jaiswal, Yijiang Li, Yaoli Peng, Guangyuan Xie
Summary: The study demonstrated that a compound collector consisting of coal tar and diesel can effectively enhance the floatability of low rank coal by modifying the chemical and physical properties of coal surface. The compound collector increased the hydrophobicity of the coal surface, generated more flocs, and accelerated the rupture of liquid film between coal particle and bubble, resulting in improved coal floatability compared to diesel alone.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Chemistry, Physical
Yuqiang Mao, Yuting Chen, Wencheng Xia, Yaoli Peng, Guangyuan Xie
Summary: This study explores the impact of liquid viscosity on dynamic pore wetting in porous materials, revealing the influence of liquid physical properties on the process. With increasing viscosity, the percentage of pore wetting decreases significantly, with a distinct order of transition pores > micropores > mesopores.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Chemistry, Physical
Yuqiang Mao, Wencheng Xia, Guangyuan Xie, Yaoli Peng
Summary: This study investigates the impact of liquid surface tension on dynamic pore wetting of porous materials through experiments and quantitative models. The results indicate that lower surface tension leads to higher pore wetting percentage in hydrophobic materials, and there is a certain pattern in the wetting processes of pores of different sizes.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Energy & Fuels
Pengfei Hu, Long Liang, Biao Li, Wencheng Xia
Summary: This study quantitatively investigated the heterocoagulation in a binary mineral mixture of coal and quartz using experimental systems based on in-situ FBRM and PVM. Results showed that heterocoagulation degree was influenced by shear rates and agitation time.
Article
Engineering, Chemical
Yijiang Li, Yuting Chen, Wencheng Xia, Guangyuan Xie
Summary: The study investigated the filtration of kaolinite-coal mixture suspension through settling behavior observation and filter cake structure analysis. A high kaolinite content mixture showed increased settling rate and specific filter cake resistance, forming fewer and smaller pores in the filter cake structure. The high settling rate led to quick filter cake formation during filtration, which increased the specific filter cake resistance.
Article
Chemistry, Physical
Kanghao Zheng, Wencheng Xia, Rongrui Wang, Yijiang Li, Wenjun Zhang
Summary: This study investigated the synergistic collection of unburned carbon particles using a mixture of Triton X-100 and kerosene in order to reduce loss on ignition (LOI) of tailings during flotation. The results showed that Triton X-100 and kerosene both adsorbed on the unburned carbon surface, improving its hydrophobicity, and Triton X-100 reduced the size of kerosene droplets which increased the collision probability of unburned carbon and oil droplets. The combination of Triton X-100 and kerosene significantly reduced LOI of tailings in the flotation process.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Chemistry, Physical
Wencheng Xia, Yijiang Li, Feng Wu, Chenkai Niu
Summary: The flotation process of fine non-coking coal from kaolinite was improved by the addition of anionic polyacrylamide, which interacted with kaolinite and coal particles through hydrogen bonding. Anionic polyacrylamide selectively flocculated kaolinite particles, reducing kaolinite pollution in the froth and decreasing the amount of kaolinite particles coating the clean coal surface. Ultimately, the flotation selectivity was enhanced by anionic polyacrylamide pre-conditioning.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Energy & Fuels
Chenkai Niu, Wencheng Xia, Yijiang Li, Xiangning Bu, Yusheng Wang, Guangyuan Xie
Summary: The study showed that a small amount of Sodium Cocoyl Glycinate can significantly improve the efficiency of low-rank coal flotation by adjusting the coal surface hydrophobicity and solution surface tension.
Article
Engineering, Chemical
Wencheng Xia, Yuqiang Mao, Guangyuan Xie, Yaoli Peng
Summary: This study investigated the role of NaOL solution in the in-situ wetting process of pores of porous active carbon. The results showed that increasing NaOL concentration led to a decrease in pore wetting percentage, with the variation trend from fast to slow. High concentration of NaOL solution significantly improved the hydrophobicity of the sample and prevented the pore wetting process.
Article
Energy & Fuels
An Ping, Yaoli Peng, Guangyuan Xie, Mengdie Wang, Wencheng Xia
Summary: This paper investigates the influence of surfactants on the dewatering effect of coals with different maceral contents. The results show that non-ionic surfactants have a good dewatering effect on vitrinite-rich coal, while cationic surfactants are effective for inertinite-rich coal. Additionally, surfactants reduce the hydrophobicity of the coal, increase porosity, and facilitate low-moisture product.
Article
Energy & Fuels
Kanghao Zheng, Wenjun Zhang, Yijiang Li, An Ping, Feng Wu, Guangyuan Xie, Wencheng Xia
Summary: In this study, a coal tar-based collector was used to remove unburned carbon (UC) from fly ash through flotation process. The adsorption mechanism of the collector on the UC particle surface was characterized, and it was found that the oxygen-containing functional groups and aromatic ring compounds in the collector significantly enhanced the floatability of UC.
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.
