Review
Polymer Science
Al Mamun, Tomasz Blachowicz, Lilia Sabantina
Summary: Air pollution is a major global health and environmental issue, leading to significant increases in respiratory allergies each year. Electrospun nanofiber mats, with their unique properties, are the preferred choice for large-scale air filtration applications. The use of biopolymers in filtration applications is relatively new and under-researched, presenting potential for future development.
Article
Chemistry, Applied
Tuhua Zhong, Wangcheng Liu, Hang Liu
Summary: Chitin was propionylated to improve its solubility in green solvents, and nanofibers with good mechanical strength, thermal stability, and hydrophobicity were successfully manufactured. The CP/PEO nanofiber mats showed potential for application in fluid filtration to separate fibrous pollutants such as carbon nanofibers and carbon nanotubes from water.
CARBOHYDRATE POLYMERS
(2021)
Article
Construction & Building Technology
Yanpeng Wu, Xiaoyu Li, Qiaoyang Zhong, Faming Wang, Bin Yang
Summary: This study created a PVDF/SiO2/Ag composite nanofiber membrane with superhydrophobic and antibacterial properties using an electrospinning method. The membrane was deposited on PET fibers to create an air filter material. The results showed that the addition of nano-silver significantly improved the antibacterial performance while increasing the concentration of hydrophobic nano-SiO2 improved the hydrophobicity. The composite nanofiber membrane had a filtration efficiency of 99.94% for 0.3μm particulate matter and a drag pressure drop of 112.3 Pa, with a filtration efficiency for air microorganisms greater than 99.99%.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Chemistry, Physical
Aatif Ali Shah, Jinyu Yang, Tanay Kumar, Cagri Ayranci, Xuehua Zhang
Summary: Transparent and flexible electrospun nanofiber membranes have attracted attention for their potential use in electronic displays, solar cells, air filtration, and medical applications. This study presents a successful fabrication technique for transparent composite nanofibrous membranes using electrospinning and a specific post-treatment. The resulting membranes exhibit excellent performance, including high optical transparency, hydrophobicity, mechanical strength, water vapor transmission rate, and thermal stability. They have potential applications in windshields, displays, and transparent wound dressings.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Article
Materials Science, Textiles
Jia Yu, Xu Tian, Binjie Xin, Jinhao Xu
Summary: The study prepared meta-aramid filtration membranes with different solid content in a mixed solvent system using the electrospinning method. It was found that the retention rate of breaking strength was highest in the 12% PMIA membrane, while the air permeability was highest in the 14% PMIA membrane. Overall, the filtration efficiency of the PMIA nanofiber filter membrane for particles of different sizes was around 99.9% at various solid contents.
FIBERS AND POLYMERS
(2021)
Article
Engineering, Chemical
Aji Insan Kamil, Muhammad Miftahul Munir
Summary: This study investigates the parameters affecting electrospun nanofiber morphology and modifies the structure to produce an air filter. The relationship between fiber diameter, volume charge density, and viscosity is explored. Furthermore, the membrane structure is modified to improve filter performance.
Article
Chemistry, Physical
Jiaxin Cui, Yulin Wang, Tao Lu, Kunming Liu, Chaobo Huang
Summary: This study prepared an environmentally friendly PVA-TA composite nanofiber membrane filter using green electrospinning and physical cross-linking method, achieving a filtration efficiency of 99.5% for PM1.0 with a pressure drop of only 35 Pa. The mechanical properties of the membrane were improved due to the intermolecular hydrogen bond between PVA and TA, making it suitable for practical application of air filtration.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Environmental Sciences
Zhuo Wang, Su Bin Kang, Euntae Yang, Sung Wook Won
Summary: This study analyzed the characteristics of PVC-based adsorptive nanofiber membranes and tested their ability to treat wastewater containing reactive dyes. The results showed that PEI/PVCM is a reusable membrane for efficient purification of wastewater containing reactive dyes.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Engineering, Chemical
Ye Bian, Chencheng Zhang, Hui Wang, Qi Cao
Summary: Air pollution poses a significant threat to public health globally. The widespread use of non-degradable filters has disrupted waste disposal systems, making degradable nanofiber filters an efficient and sustainable solution for air filtration. This review provides comprehensive insights into the composition, performance, and potential applications of degradable nanofiber filters for particulate matter removal, and suggests future directions.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Engineering, Environmental
Shiyu Xie, Bo Xu, Li Yuan, Yaxin Zhao, Na Ma, Yaomin Wang, Dagang Liu, Aimin Xiang, Yuge Ouyang, Huafeng Tian
Summary: In this study, zein-based composite nanofibers loaded with curcumin were prepared by electrospinning assisted with polyvinyl alcohol. The modified nanofibers exhibited high moisture resistance and good adhesion to cellulose paper towels as air filter substrates. Additionally, the tensile strength of the nanofibers was significantly enhanced.
JOURNAL OF POLYMERS AND THE ENVIRONMENT
(2023)
Article
Materials Science, Multidisciplinary
Le Kang, Yuankun Liu, Liping Wang, Xiaoping Gao
Summary: A nanofiber/microfiber composite membrane (NMCM) was successfully fabricated to improve the filtration efficiency and reduce the resistance of respiration in medical protective masks. Experimental results showed that NMCM has significantly increased filtration efficiency and met protection requirements for respiratory resistance, with optimal spinning parameters identified as spinning solution concentration of 15%, voltage of 27 kV, TCD of 22 cm, and flow rate of 2.5 ml/h.
MATERIALS RESEARCH EXPRESS
(2021)
Article
Engineering, Chemical
Riyadh Al-Attabi, Fenghua She, Shuaifei Zhao, Ludovic F. Dumee, Jurg A. Schutz, Weihong Xing, Zhaoxiang Zhong, Lingxue Kong
Summary: Electrospinning was used to synthesize nanofiber membranes from polyvinylidene fluoride (PVDF) for separating airborne contaminants. By optimizing the electrospinning process, scalable and comfortable PVDF nanofiber membranes with high filtration efficiency were achieved. Compared to commercial surgical face masks, the PVDF nanofiber membranes had smaller fiber diameter, higher mechanical strength, and better filtration efficiency.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Euijin Shim, Hyeonjin Eom, Seunghwan Ahn, Yeonsang Kim
Summary: In this study, a conventional PTFE foam-coated glass fabric filter was coated with a nanoparticle-decorated nanofiber filter to improve the surface and filtration performance of baghouse systems used in industrial sites. The coated filter showed improved hydrophobic surface characteristics and better filter performance compared to the uncoated filter. The results indicate that the nanoparticle-decorated nanofiber filter enhances the filtration efficiency and air flow rate while maintaining the surface properties of the uncoated filter.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2023)
Article
Biochemistry & Molecular Biology
Jizhen Wang, Shaoyang Liu, Xu Yan, Zhan Jiang, Zijing Zhou, Jing Liu, Guangting Han, Haoxi Ben, Wei Jiang
Summary: This study fabricated a lithium chloride enhanced cellulose acetate/thermoplastic polyurethanes (CA/TPU-LiCl) reusable filtration membrane using coaxial electrospinning. The membrane showed excellent filtration performance and remained unaffected after alcohol immersion disinfection treatment.
Article
Chemistry, Physical
Ling Wang, Yanfei Gao, Junpeng Xiong, Weili Shao, Chen Cui, Ning Sun, Yuting Zhang, Shuzhen Chang, Pengju Han, Fan Liu, Jianxin He
Summary: This study introduces a new method for creating biodegradable and reusable fibrous mask filters using true nanoscale bio-based poly(lactic acid) (PLA) fibers. The designed filter exhibits high filtration efficiency and low pressure drop, making it suitable for mask preparation.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Chemistry, Physical
A. Moghadam, H. Vahedi Tafreshi
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2020)
Article
Chemistry, Multidisciplinary
Mohammad Jamali, Hooman Vahedi Tafreshi
Article
Engineering, Chemical
S. H. Yousefi, H. Vahedi Tafreshi
SEPARATION AND PURIFICATION TECHNOLOGY
(2020)
Article
Chemistry, Multidisciplinary
H. J. Holweger, M. Jamali, H. Vahedi Tafreshi
Summary: This study presents the first experimental-computational research on the centrifugal detachment of compound droplets from a fiber, focusing on the interplay between interfacial and external forces. Experimental observations showed differences in behavior between silicone-oil-cloaked droplets and mineral-oil-cloaked droplets, as well as a decrease in detachment force with increasing oil-to-water volume ratio. Simulations using the Surface Evolver code revealed the evolution of interfacial forces and allowed for the definition of effective interfacial tensions and contact angles for detaching compound droplets, showing reasonable agreement with experimental measurements.
Article
Physics, Applied
M. Jamali, K. S. Mehta, H. Holweger, M. M. Amrei, H. Tafreshi
Summary: This work demonstrates the potential of using magnetic repulsion force to reduce residue volume after detachment of a ferrofluid droplet. By controlling the spatial strength of the magnetic field, this technique provides a means to control detachment residue, improving understanding of droplet adhesion and residue formation during detachment.
APPLIED PHYSICS LETTERS
(2021)
Review
Engineering, Mechanical
Mohammad Jamali, Hooman Tafreshi
Summary: This paper provides a brief overview of the use of magnetic field in studying droplet adhesion to fiber or fibrous surfaces. It discusses quantifying the force required to detach a droplet from a fiber, as well as droplet detachment from fibrous surfaces. It highlights a magnetic approach for measuring detachment force, simplicity, and non-intrusive nature compared to existing methods.
EXPERIMENTS IN FLUIDS
(2021)
Article
Chemistry, Physical
M. Jamali, H. Vahedi Tafreshi
Summary: This paper presents a new approach for simulating the 3-D shape of droplets on a curved surface using the Surface Evolver (SE) finite element program. By using solid-liquid surface energy instead of contact angle, the approach simplifies the simulation process and successfully models the shapes of single-phase and compound droplets on a spherical surface.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Polymer Science
S. Mashfiqur Rahman, Hooman Vahedi Tafreshi, Behnam Pourdeyhimi
Summary: In this study, a model was used to simulate the formation of electrospun fibers, and a deep neural network model was developed to guide the electrospinning experiment towards producing fibers with a desired diameter.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Chemistry, Physical
Saqlain Raza, Jixiong He, Hooman V. Tafreshi, Jun Liu
Summary: Understanding the dynamics of droplet condensation-evaporation behavior on fibers is crucial for improving the performance of fibrous membranes in water purification applications. In this study, molecular dynamics simulations were used to reveal the dynamics of water condensation-evaporation on fiber surfaces, and parameter optimization was conducted to guide membrane design.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Engineering, Chemical
M. Jamali, S. Atri, S. Gautam, A. M. Saleh, H. V. Tafreshi, B. Pourdeyhimi
Summary: In this study, the performance of an N95 facemask was simulated using a macroscale model. The simulations were done to evaluate the collection efficiency and pressure drop of the facemask under different conditions. The model was calibrated using experimental data and a correction factor was developed to account for nanoparticle-deposits.
AEROSOL SCIENCE AND TECHNOLOGY
(2023)
Article
Multidisciplinary Sciences
Yi-xiao Liu, Francisco J. Chaparro, Ziting Tian, Yizhen Jia, John Gosser, Jeremy Gaumer, Liam Ross, Hooman Tafreshi, John J. Lannutti
Summary: We used laser metrology to study the effect of collector rotation on the porosity gradients of electrospun PCL scaffolds. It was found that the porosity varied with rotational speed, with higher rotational speeds leading to lower porosity. The relatively small changes in porosity values resulted in large variations in pore size, which affected cell infiltration. Faster rotational speeds improved axial alignment but decreased pore size, compromising cell infiltration. Sacrificial fiber approaches were also found to be inefficient in achieving cell-permissive pore sizes.
Article
Engineering, Chemical
S. Gautam, A. M. Saleh, H. V. Tafreshi, J. G. Radney, B. Pourdeyhimi
Summary: Existing studies have found that the particle collection efficiency of a charged filter initially decreases with particle loading, then increases with further loading. This is different from the trend observed for pressure drop, which continuously increases with particle loading. The present paper proposes a semi-empirical macroscale simulation method to predict the instantaneous pressure drop and particle collection efficiency of an electrostatically charged filter during the early stages of particle loading. The simulations were conducted using ANSYS software with in-house subroutines. The results were compared to experimental data obtained from testing a bipolarly-charged polypropylene filter exposed to different levels of nanoparticle loadings.
JOURNAL OF AEROSOL SCIENCE
(2023)
Article
Mechanics
Nishant Bhatta, Hooman V. Tafreshi, Behnam Pourdeyhimi
Summary: This paper presents a new approach to study coalescence filtration by replacing the aerodynamic field inside the filter with a centrifugal force field and decoupling the role of fiber properties from that of the airflow in fluid accumulation in a filter. Numerical simulation and experiments were used to compare the desaturation of a liquid-saturated fibrous media via centrifugal force and via compressed air. The advantages of centrifugal desaturation over traditional pressure-driven desaturation were discussed.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Materials Science, Multidisciplinary
Richard J. Alan Esteves, Veronica Gornick, Dea Santi Alqurwani, Joshua Koenig-Lovejoy, Haneen Abdelrazeq, Majeda Khraisheh, Anna Forzano, Mohamed Gad-el-Hak, Hooman Vahedi Tafreshi, James T. McLeskey
EMERGENT MATERIALS
(2020)
Article
Engineering, Chemical
Haneen Abdelrazeq, Majeda Khraisheh, Fares Al Momani, James T. McLeskey, Mohammad K. Hassan, Mohamed Gad-el-Hak, Hooman Vahedi Tafreshi
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.
