Article
Engineering, Chemical
Mingheng Li
Summary: A spatiotemporal model is developed for dynamic simulations of RO desalination, taking into account factors such as pressure drop and concentration polarization. The model uses a numerical method based on orthogonal collocation on finite elements to solve coupled partial differential equations. Examples of RO with periodic feed flow reversal and membrane flushing in batch operations demonstrate the model's applications, revealing insights into salt concentration overshoot and the impact of turning off permeate flux during flushing.
Article
Multidisciplinary Sciences
Ali J. Mazaltarim, John J. Bowen, Jay M. Taylor, Stephen A. Morin
Summary: Materials and strategies for dynamic transport of microdroplets are relevant to various applications such as surface fluidics and analytical devices. Advanced techniques based on electrowetting, micropatterns, and gradients have been developed, but challenges remain in dynamic microdroplet transport. This study highlights the fabrication of mechano-tunable microtextured chemical gradients on elastomer films for controlled microdroplet transport. The interplay between driving forces and microtopography enables accurate prediction of conditions for successful transport.
NATURE COMMUNICATIONS
(2021)
Review
Engineering, Environmental
Yulong Yang, Weifeng Yuan, Jirui Hou, Zhenjiang You
Summary: Permeability reduction and formation damage caused by fines migration is a major reason for productivity decline. This paper reviews the primary factors influencing fines migration and the mathematical formulations for quantification. It also introduces experimental observations that contradict theoretical predictions, such as delayed particle release and attachment-detachment hysteresis. A hypothesis is proposed to explain the shifting of equilibrium positions, providing new insight into the interpretation of attachment-detachment hysteresis. The quantification of anomalous salinity effect on adhesion force is also discussed.
Review
Chemistry, Multidisciplinary
Amit Kahana, Svetlana Maslov, Doron Lancet
Summary: Life may not solely rely on biopolymers like RNA and proteins, as lipid assemblies could play a crucial role in the origin of life. Further investigation is needed to determine if lipid assemblies have protein-like capacities for specific interactions. Experimental evidence suggests that lipid aggregates have dynamic surface configurations capable of specific molecular recognition.
CHEMICAL SOCIETY REVIEWS
(2021)
Article
Chemistry, Multidisciplinary
Dmitrii Kriukov, A. Hazal Koyuncu, Albert S. Y. Wong
Summary: This work presents an enzymatic autocatalytic network capable of dynamic switching under out-of-equilibrium conditions. By perturbing the competition between autocatalysis and inhibition, a simple molecular system comprising three components demonstrates a variety of essential neuromorphic behaviors.
Article
Engineering, Mechanical
Prabhat Ranjan, K. P. Sibivivek, Ashok Kumar Pandey
Summary: This paper investigates the influence of different parameters on the frictional energy dissipation of 3D-printed bolted joints with various configurations. A test rig is developed using accelerometers and a shaker to measure the induced relative displacement. The experiment examines the effects of bolt preload, excitation frequency, excitation amplitude, and the type of contact between the bolted plates on the frictional energy dissipation.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Chemistry, Multidisciplinary
Juan Bisquert, Antonio Guerrero
Summary: Chemical inductor is a non-electromagnetic inductive behavior present in various chemical, biological, and material systems. Its structure consists of a two-dimensional system coupling a fast conduction mode and a slowing down element, and it is generally defined in dynamical terms. Chemical inductor exhibits familiar features in electrochemical reactions, solid-state semiconductor devices, and biological neurons, and plays a crucial role in system stability, bifurcations, and chaotic properties.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Analytical
Qiang Zhang, Ling Lin, Xizhen Yi, Tianze Xie, Gaowa Xing, Yuxuan Li, Xiaorui Wang, Jin-Ming Lin
Summary: The study presents a microfluidic method for extracting undissolved chemical components from subcellular regions of living cells, enabling in-depth analysis. The method allows control over the sampling region and successfully extracts immobilized components.
ANALYTICAL CHEMISTRY
(2023)
Article
Engineering, Chemical
Jinyan Wang, Jingrun Xing, Ge Li, Zhikan Yao, Zhen Ni, Jing Wang, Songmiao Liang, Zhijun Zhou, Lin Zhang
Summary: Autopsies were conducted on end-of-life RO membranes from four different applications, revealing the characteristics of fouling layers and proposing strategies to extend their lifetime.
Article
Engineering, Environmental
Ying Siew Khoo, Woei Jye Lau, Yong Yeow Liang, Mustafa Karaman, Mehmet Gursoy, Gwo Sung Lai, Ahmad Fauzi Ismail
Summary: This study utilized an environmentally friendly PECVD technique to modify the surface properties of commercial thin film composite XLE RO membrane, showing that O-2-modified membrane outperformed PANI-modified and unmodified membranes in terms of fouling resistance and desalination performance. The results demonstrated that the O-2 modification enhanced surface hydrophilicity, water permeability, and rejection rates of NaCl and Na2SO4.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Nanoscience & Nanotechnology
Xiaofeng Luan, Pengbin Liu, Di Huang, Haiping Zhao, Yuang Li, Sheng Sun, Wenchang Zhang, Lingqian Zhang, Mingxiao Li, Tian Zhi, Yang Zhao, Chengjun Huang
Summary: Real-time transformation is crucial for impedance flow cytometry in practice, but the translation of raw data to cellular intrinsic electrical properties is time-consuming. We proposed a fast parallel physical fitting solver that characterizes single cells' electrical properties within 0.62 ms/cell. Based on this solver, we implemented physics-informed real-time impedance flow cytometry (piRT-IFC), which showed comparable speed but higher accuracy than the fully connected neural network predictor. In addition, we demonstrated the advantages of piRT-IFC in handling unfamiliar samples without pretraining.
MICROSYSTEMS & NANOENGINEERING
(2023)
Article
Engineering, Environmental
Cigdem Balcik
Summary: An autopsy of spiral wound RO membrane operated in brackish water treatment was conducted to understand foulants and fouling mechanisms, which determined the fouling components and recommended a fouling control strategy to increase membrane life.
WATER SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Chemical
Juntao Wang, Shao-Lu Li, Yaxu Guan, Can Zhu, Genghao Gong, Yunxia Hu
Summary: This study successfully improved the water flux, antifouling properties, and chlorine-resistance of PA RO membranes by grafting sulfonamide monomers onto the membrane surface. The modified membranes showed significant enhancements in performance, demonstrating great potential for applications in water treatment.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Polymer Science
Shifeng Fang, Jieru Wang, Siwu Wu, Shuangjian Yu, Zhenghai Tang, Baochun Guo
Summary: The study proposed a facile network design strategy to achieve covalently cross-linked elastomer with mechanical robustness and recyclability by engineering heterogeneous blend networks in a diene-rubber system. The microphase-separated structure with strong interfacial adhesion was formed through direct mixing of two thermodynamically incompatible diene-rubbers. The overall chain orientation of the networks was promoted by efficient interfacial stress transfer, resulting in improved reinforcement. The resulting system exhibited desirable recyclability and high elasticity compared to conventional thermoplastic vulcanizates.
Review
Chemistry, Analytical
Amanpreet Kaur, Dnyaneshwar P. Kale, Arvind K. Bansal
Summary: Surface properties play a crucial role in impacting manufacturability, processability, dissolution kinetics, and stability of pharmaceutical solids by altering solid-solid and solid-liquid interfacial interactions. Surface characterization requires sensitive analytical tools that can access the topmost layer of a solid and can be performed using techniques like spectroscopy, microscopy, mass spectrometry, and calorimetry. Understanding and selecting appropriate analytical tools are essential for characterizing surface properties effectively.
TRAC-TRENDS IN ANALYTICAL CHEMISTRY
(2021)
Review
Engineering, Environmental
Min Gyu Shin, Wansuk Choi, Sung-Joon Park, Sungkwon Jeon, Seungkwan Hong, Jung-Hyun Lee
Summary: Trace organic compounds (TOrCs) are a critical concern for water quality and safety, with advanced water treatment technologies like reverse osmosis (RO) and nanofiltration (NF) membranes showing promise in removing these compounds. The rejection mechanisms of TOrCs by RO/NF membranes remain unclear due to differences in membrane structures and limited research on TOrCs. This review focuses on characterizing rejection mechanisms and proposes future directions for improving TOrC separation performance of RO/NF membranes.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Environmental Sciences
Pema Dorji, Sherub Phuntsho, David Inhyuk Kim, Sungil Lim, Myoung Jun Park, Seungkwan Hong, Ho Kyong Shon
Summary: A bromide selective composite electrode was developed for membrane capacitive deionisation (MCDI), showing ten times better bromide selectivity than conventional carbon electrodes. This demonstrates the potential application of MCDI for selectively removing target ions and resource recovery through basic modification of commercial electrodes.
Article
Engineering, Chemical
Junghyun Kim, Eun-Tae Yun, Leonard Tijing, Ho Kyong Shon, Seungkwan Hong
Summary: By using a multi-layered single-wall carbon nanotube/polyvinylidene fluoride coating, electrical repulsion technology can effectively address fouling and wetting issues in membrane distillation, prolonging operation time and enabling sustainable membrane distillation under high recovery conditions.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Engineering, Chemical
Seonkyu Lee, Jungbin Kim, Eunhyang Lee, Seungkwan Hong
Summary: This study systematically investigates the factors affecting membrane contactors for efficient CO2 stripping, providing strategies for improving performance and efficiency. The findings highlight the importance of factors such as liquid flow rate, vacuum pressure, pH, and design, and contribute to the development of CO2 capture technologies.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Engineering, Environmental
Nurshaun Sreedhar, Musthafa O. Mavukkandy, Tejraj M. Aminabhavi, Seungkwan Hong, Hassan A. Arafat
Summary: This study systematically investigates the impact of feed spacer design on membrane fouling mechanism in ultrafiltration process. Experimental crossflow UF experiments were conducted using dextran and sodium alginate in different spacer geometries. The results show that spacer design significantly affects the fouling mechanism in UF separation.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Chemical
Yong-Uk Shin, Jihun Lim, Seungkwan Hong
Summary: This study proposes two integrated electrochemical methods for the reuse of flue-gas desulfurization wastewater (FGDW): photoelectrochemical oxidation (PECO) using a self-doped black TiO2 nanotube array (Black-TNA) catalyst and flow-electrode capacitive deionization (FCDI). The study found that the electrocatalytic activity and oxidative performance of the Black-TNA annealed at 600 degrees C were superior to those of the conventional Blue-TNA. Furthermore, the use of Black-TNA in PECO under sulfate-based conditions showed exceptional degradative results for the removal of organic pollutants. The study also confirmed the feasibility of using FGDW as a flow-electrode electrolytic solution in the FCDI system, and demonstrated that the integrated PECO-FCDI system can effectively remove organic pollutants and salts without the use of additional chemicals.
Article
Engineering, Chemical
Abayomi Babatunde Alayande, Seungkwan Hong
Summary: It is crucial to remove algal toxins from discharged brine to protect marine life and human health. This study examined the mineralization of a specific algal toxin in highly concentrated seawater using an ultraviolet light activated peroxymonosulfate system, and found that the presence of certain anions reduces the mineralization efficiency.
Article
Engineering, Chemical
Jaewon Lee, Yeojin Shin, Chanhee Boo, Seungkwan Hong
Summary: Various industrial activities generate highly acidic wastewaters, posing a particular concern due to their large volume, environmental impact, and limited disposal options. Nanofiltration (NF) has the potential to provide energy-, cost-, and space-effective solutions for wastewater treatment at industrial sites.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Review
Engineering, Chemical
Abayomi Babatunde Alayande, Jihun Lim, Jungbin Kim, Seungkwan Hong, Ahmed Saleh Al-Amoudi, Byungsung Park
Summary: Harmful algal blooms pose a significant challenge to the operation of seawater reverse osmosis desalination plants. This study reviews the historical changes and current status of pretreatment applications for large desalination plants and evaluates the efficiency of these systems in mitigating the impact of harmful algal blooms. The study also proposes future strategies for intelligent monitoring, improvement of unit processes, and utilization of algal biomass for greener operation.
Article
Green & Sustainable Science & Technology
Jaewon Lee, Min Zhan, Youngjin Kim, Seungkwan Hong
Summary: This study investigated the treatment of real Cijengkol river water in Indonesia using a novel hollow fiber nanofiltration (HFNF) system. Ultrafiltration (UF) pretreatment was performed to evaluate its impact on the HFNF performance. The results showed that UF could only remove solids, while both nanofiltration (NF) and the UF-NF hybrid achieved high removal efficiency for impurities, meeting drinking water quality standards. However, organic fouling was observed in the HFNF membranes. Various cleaning methods were investigated, and chemically enhanced backwashing (CEBW) with sodium hypochlorite proved to be effective in controlling membrane fouling. CO2 nucleation backwashing also showed promising results in removing certain types of organic fouling. Overall, this study provides insights into the efficient treatment of river water using HFNF, and the importance of controlling organic fouling in membrane systems.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Engineering, Environmental
Seonkyu Lee, Jungbin Kim, Junghyun Kim, Seungkwan Hong
Summary: This study investigates the anti-fouling performance of an electrically conductive membrane contactor (ECMC) for CO2 stripping in commercialized carbon capture utilization & storage (CCUS) process. The study finds that surface modification with a two-layered ECM improves the electrical conductivity and CO2 stripping flux. Electrostatic repulsion and high voltage electrochemical oxidation process contribute to the enhanced anti-fouling performance. The O-2 sweep gas mode helps maintain high CO2 stripping flux with high oil and grease concentrations. The results demonstrate that ECMC improves the energy efficiency of CO2 stripping in CCUS.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Environmental Sciences
Ali M. Abou-Elanwar, Jongmin Oh, Songbok Lee, Youngjin Kim
Summary: A novel nanofiltration membrane with a layer of modified diatomaceous earth between two layers of electrospun polysulfone nanofibers was developed. The diatomaceous earth particles and the fabricated membrane were characterized using various techniques. The sandwich-like membrane showed improved flux and methylene blue (MB) rejection as pH increased, with a high water flux at increased pressure but reduced MB rejection. Moreover, the sandwich-like membrane exhibited remarkable dye/salt separation at high salt concentration, with higher permeation of salt and high MB rejection. The performance of the regenerated diatomaceous material and membrane was maintained during five cycles of operation.
Article
Green & Sustainable Science & Technology
Yonghwan Kang, Jiuk Kwon, Jungbin Kim, Seungkwan Hong
Summary: Ultrapure water is crucial in the semiconductor industry, but the presence of low molecular weight organic matters (LMWOMs) in feed water sources can affect its quality. This study investigates the mechanisms of LMWOM removal in reverse osmosis (RO) and the performance of vacuum ultraviolet (VUV) for producing high-quality ultrapure water. It finds that RO primarily removes LMWOMs through size exclusion, but certain substances such as methanol, ethanol, and urea are not efficiently removed. Lab-scale and pilot-scale VUV experiments demonstrate the limitations in removing LMWOMs with low reactivity. The study discusses strategies for ultrapure water production using current water sources.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Engineering, Environmental
Junghyun Kim, Leonard Tijing, Ho Kyong Shon, Seungkwan Hong
Summary: Membrane distillation (MD) has potential for high salinity treatment and zero liquid discharge (ZLD), but faces challenges in fouling and scaling under high recovery conditions. This study proposes alternating current (AC) operation for electrically conductive membrane distillation (ECMD) to control both cations and anions, increasing water recovery by 27%.
Article
Chemistry, Multidisciplinary
Eun-Tae Yun, Woonghee Lee, Yong-Yoon Ahn, Jaemin Choi, John D. Fortner, Kangwoo Cho, Seungkwan Hong, Jaesang Lee
Summary: In this study, a nitrogen-doped graphene film was successfully fabricated and demonstrated superior electrical conductivity and treatment efficiency in oxidative organic degradation and persulfate conversion reactions. Furthermore, the graphene film also showed a dual role as a carbon catalyst and cathode.
ENVIRONMENTAL SCIENCE-NANO
(2022)
