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Article
Chemistry, Physical
Priyanka Koner et al.
Summary: The theoretical analysis of the mass transfer process in an oscillatory electroosmotic flow (EOF) is studied in a fractional Jeffrey fluid model with a polyelectrolyte layer (PEL) coated cylindrical annulus. The ion partitioning effect is observed due to the difference in permittivity between PEL and the electrolyte solution. Analytical solutions for induced potential and axial velocity are presented for both the PEL and electrolyte regions. The separation of species depends on various factors such as the Damkohler number, absorption parameter, and phase partitioning coefficient.
Article
Energy & Fuels
Baghir A. Suleimanov et al.
Summary: This paper presents the results of studying the displacement of residual oil using nanofluids, which can improve oil recovery by altering the wettability of the rock pores, reducing interfacial tension, decreasing oil viscosity, and increasing disjoining pressure.
PETROLEUM SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Kang-Ting Huang et al.
Summary: Developing ion-selective membranes with anti-biofouling property and biocompatibility is crucial for harvesting osmotic energy and biomimetic applications. In this study, a tough zwitterionic gradient double-network hydrogel membrane (ZGDHM) with excellent biofouling resistance and cytocompatibility was developed. The ZGDHM exhibited remarkable mechanical properties and achieved an unprecedented output power for osmotic energy harvesting.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Electrochemistry
Changzheng Li et al.
Summary: In this study, the effects of different boundary conditions on ion concentration distribution, velocity, and energy conversion performance in nanochannels were investigated. The results show that boundary slip can significantly improve the power generation performance. Furthermore, the power generation performance under independent slip and dependent slip deviates due to the restriction of surface charge on boundary slip. The findings provide useful information for the design and optimization of nanochannel power generation.
ELECTROCHIMICA ACTA
(2023)
Article
Nanoscience & Nanotechnology
Iat Wai Leong et al.
Summary: By using partial dielectric coatings, the nonlinear ionic current through a pore can be altered, allowing the pore to behave like a resistor, diode, and bipolar junction transistor. The reasons for asymmetric ion transport in the pore and the relationship between specifically charged surfaces and electroosmotic flow are revealed through numerical simulations. These findings provide a direct approach to modify the electroosmotic-flow-driven ionic current rectification in channel-based devices via dielectric coatings.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Engineering, Environmental
Binglin Zhou et al.
Summary: A bottom-up strategy integrating cellulose dissolution, orientation, regeneration, and densification was used to construct regenerated cellulose-based nanofluidic fibers (RCNFs) with high weight content of acidified carbon nanotubes, aligned nanochannels, and negatively charged surfaces. The RCNFs exhibited high underwater strength, unprecedentedly high ionic conductivity, and high long-term output power density. They were successfully used to power a calculator and LED lights in a proof-of-concept experiment.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Po-Yen Chuang et al.
Summary: The electrokinetic behaviors of a nanopore, such as ionic current rectification, selectivity, and electroosmotic flow, have significant influence on various applications. The shape and charged conditions of the nanopore greatly affect its performance, which is studied through comparison of six types of charged nanopores. The internal volume of the nanopore is found to be the most important factor in determining its behavior, while selectivity depends on both the internal volume and the fraction of the narrow region. The nature of charge and the geometry of the nanopore also affect its velocity profile, along with the salt concentration.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Article
Electrochemistry
Zheng Liu et al.
Summary: In this study, the influence of surface charge gradient on energy conversion behavior in nanochannel was investigated using nanofluid systems. The results showed that the negative surface charge gradient exhibited the best energy conversion performance. This high performance was mainly attributed to its excellent ion selectivity during the energy conversion process. These findings provide a general strategy for tuning nanofluid power generation and contribute to the understanding of the basic mechanism in fluidic energy devices.
ELECTROCHIMICA ACTA
(2023)
Article
Biochemical Research Methods
Sourav Sengupta et al.
Summary: This study explores the impact of wall roughness on mass transfer in a microtube with porous wall. The effects of corrugation amplitude and wavenumber on mass transport are assessed using perturbation approximations and numerical analysis. It is discovered that solute mass flux can be enhanced by 10% through appropriate tuning of corrugation amplitude. These findings contribute to a better understanding of mass transport in porous-walled, rough microtubes, which is crucial for applications such as micromixers and targeted drug delivery.
Article
Electrochemistry
Zheng Liu et al.
Summary: Ion transport in nanochannels is studied with the aim of understanding the impact of asymmetric geometry and surface charge on ion rectification performance. Low surface charge gradient enhances ion rectification, while high surface charge gradient leads to anomalous electrokinetic behavior that deteriorates ion rectification. The coordination mechanism of asymmetric geometry and surface charge determines the enhancement-deterioration transition threshold. This work provides valuable guidance for the design of nanofluidic energy devices.
ELECTROCHIMICA ACTA
(2023)
Article
Electrochemistry
Amin Alinezhad et al.
Summary: This article examines the use of nanofluidic membranes containing straight nanopores as nanotransistors, focusing on the PNP nanotransistor with its three regions representing the emitter, base, and collector. Applying voltage to the base region increases the current flowing between the emitter and collector regions. The study investigates the effect of electrolyte concentrations on the PNP nanotransistor's performance and suggests that adjusting these concentrations can enhance the device's functionality and open up new opportunities for nanoscale electronics.
ELECTROCHIMICA ACTA
(2023)
Article
Thermodynamics
Nan Qiao et al.
Summary: The influence of nanochannel shape and surface charge on ion transport and ion current rectification (ICR) performance of asymmetric nanochannels was studied. It was found that changes in spatial size were not beneficial for improving ICR performance, with the conical nanochannel exhibiting the best performance. Moreover, specified asymmetric surface charge on the outer wall surface enhanced the corresponding ICR performance, while the length of the nanochannel determined whether the outer or inner wall surface charge dominated. The results provide essential insights and guidelines for the design and optimization of biological sensors and nanofluidic devices.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Review
Chemistry, Physical
Santiago E. Herrera et al.
Summary: The complexation of polyelectrolytes with other oppositely charged structures has led to the development of various functional materials with potential applications in many technological fields. Recent research has focused on the complexation of polyelectrolytes with alternative building blocks such as small charged molecules, and the similarities between these complexes and well-known polycation-polyanion complexes. This review discusses the physicochemical characteristics of these complexes and their potential as versatile functional platforms in fields such as biomedicine and advanced materials engineering.
Article
Chemistry, Physical
Amin Alinezhad et al.
Summary: This study investigated the impact of considering different properties for the soft layer and electrolyte on ion current rectification in bipolar soft nanochannels. The findings demonstrated that taking into account the differences in properties of the soft layer and electrolyte greatly improved the rectification factor.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Mechanics
Mohammad Karimzadeh et al.
Summary: This article numerically investigates the influence of channel geometry on the ionic selectivity and ionic current rectification of soft nanochannels. It shows that the rectification behavior of soft nanochannels can be significantly improved by using denser polyelectrolyte layers, especially at low and moderate salt concentrations.
Article
Biophysics
Zahra Seifollahi et al.
Summary: In this paper, the impact of ionic size on electroosmotic flow in an ion-selective soft slit nanochannel is analytically studied. The results show the importance of considering ionic size in the calculation and demonstrate the amplifying effect of steric effect on the electroosmotic velocity.
COLLOIDS AND SURFACES B-BIOINTERFACES
(2022)
Article
Multidisciplinary Sciences
Saqib Murtaza et al.
Summary: Numerical simulations of non-linear Casson nanofluid flow in a microchannel using the fractal-fractional flow model were conducted. The study found that a higher electro-kinetic parameter reduces the fluid velocity and that the fractional and classical models can be obtained from the fractal-fractional model by setting the parameters to zero. Additionally, it was observed that the insertion of Cadmium Telluride nanoparticles increased the heat and mass transfer rates.
SCIENTIFIC REPORTS
(2022)
Article
Chemistry, Physical
Jun-Sik Sin
Summary: This paper examines the electrostatic and structural properties between pH-responsive polyelectrolyte brushes by considering excluded volume interactions, the density of chargeable sites, and the Born energy difference. It is found that excluded volume interactions and the density of chargeable sites on polyelectrolyte molecules impact the electrostatic potential and osmotic pressure between the brushes, and that approaching brushes lead to decreased thickness and enhanced contraction with large excluded volume interactions and chargeable site densities. Additionally, the influence of factors such as pH, Kuhn monomer number, charged sites density, lateral separation, and Kuhn length on electrostatic and structural properties is demonstrated in the presence of excluded volume interactions. Finally, the Born energy difference affects the thickness of polyelectrolyte brushes and osmotic pressure between two pH-responsive polyelectrolyte brushes.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Hossein Dartoomi et al.
Summary: Researchers are exploring new, clean, and accessible sources of energy, and water salinity shows promise as a renewable energy source. The study focuses on NRED systems and their efficiency in converting saline water into electricity. By altering the nanochannel coating and employing different geometries, significant improvements in energy conversion efficiency and power output can be achieved.
Article
Multidisciplinary Sciences
Mahdiyeh Monesi et al.
Summary: This study explores the numerical investigation of ion transport rate and extraction recovery using flat sheet supported liquid membrane (FSLM) and electro flat sheet supported liquid membrane (EFSLM). It is found that increasing applied voltage can enhance the extraction recovery, and the presence of nanoparticles has significant effects on the performance of the SLM system.
SCIENTIFIC REPORTS
(2022)
Article
Chemistry, Multidisciplinary
Gregorio Laucirica et al.
Summary: The use of track-etched membranes combined with metal-organic frameworks (MOFs) allows for fine-tuning of transport regimes and enhances their potential in (bio)sensing and energy-harvesting applications. This study proposes the creation of a single track-etched nanochannel modified with UiO-66 MOF, which shows significant changes in the transport regime of the nanofluidic device.
ADVANCED MATERIALS
(2022)
Review
Biophysics
Vahid Kordzadeh-Kermani et al.
Summary: This review introduces the on-board power supply and electrokinetic applications of electrified-LOD (eLOD) devices. By utilizing electrokinetic phenomena, different microfluids can be propelled, separated, and manipulated. While extensive research exists on stationary platforms, the applications on rotating platforms are still underdeveloped.
BIOSENSORS & BIOELECTRONICS
(2022)
Article
Engineering, Chemical
Zahra Seifollahi et al.
Summary: This study numerically investigates the electroosmotic flow and ion transport in a conical nanochannel coated with a polyelectrolyte layer. Different types of charge density distribution functions are considered, and it is found that the soft step function enhances ion selectivity. The results demonstrate that considering the soft step function can significantly improve the rectification factor of the conical nanochannel.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Electrochemistry
Hossein Dartoomi et al.
Summary: Energy production is a pressing issue, and scholars are focusing on finding alternative sources. This study explores the effect of nanochannel shape on ion transfer behavior and investigates the impact of different geometries, soft layer density, and concentration ratio on energy production. The results show that the best geometries for different factors vary, and increasing the soft layer's charge density can significantly boost power production.
ELECTROCHIMICA ACTA
(2022)
Article
Chemistry, Analytical
Hossein Dartoomi et al.
Summary: This study examines the influence of the presence of a soft, layer-by-layer (LBL) coating in charged nanochannels on ion transport parameters. The effects of pH, soft layer charge density, bulk concentration, and hard surface charge density on ionic current rectification and selectivity are determined using modeling. The results present a promising hybrid architecture for enhanced rectification.
ANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Physical
Tien Juin Liu et al.
Summary: This theoretical study investigates the behavior of ionic current rectification in a conical nanopore functionalized with two polyelectrolyte layers under an applied pH gradient. The direction of the pH gradient plays a significant role due to the electroosmotic flow, and the mechanisms of ionic transport in this pH asymmetric system are discussed. The results show that the behavior of nanopore rectification can be effectively tuned by applying an extra pH gradient, and the case of merging two polyelectrolyte layers into one is also examined.
Article
Chemistry, Physical
Mohammad Karimzadeh et al.
Summary: This study investigates the effects of temperature and concentration gradients on salinity energy generation and determines the optimal conditions for maximum efficiency in funnel-shaped soft nanochannels. The results show that increasing temperature and concentration ratios significantly increase the salinity energy generation.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Biochemical Research Methods
Paramita Mahapatra et al.
Summary: In this work, new analytical expressions defining the electrophoretic mobility of composite soft particles are reported, taking into account dielectric permittivity gradients at interfaces. These expressions are applicable to charged particles with size well exceeding the Debye layer thickness, and discuss the impacts of ions partitioning on the electrophoretic response.
Article
Electrochemistry
Mahdi Khatibi et al.
Summary: Nanochannels covered with a polyelectrolyte layer have been shown to significantly increase the power generation by reverse electrodialysis, with the sensitivity of energy conversion efficiency and power generation rate being relatively high to the difference in properties between the PEL and the electrolyte. By tailoring the PEL structure, especially through densely distributing polyelectrolyte brushes, both efficiency and power density can be effectively increased.
ELECTROCHIMICA ACTA
(2021)
Article
Electrochemistry
Mohammad Karimzadeh et al.
Summary: This study investigated the influence of channel geometry on the ion selectivity and ionic current rectification of soft nanochannels. Different geometries of channels showed varying ion selectivity and rectification factors, with the impact differing depending on the shape of the channel.
ELECTROCHIMICA ACTA
(2021)
Article
Thermodynamics
Mohammad Karimzadeh et al.
Summary: The study investigated the effects of temperature and concentration gradients on ionic selectivity, ionic current rectification, Joule heating, and viscosity dissipation in conical soft nanochannels through numerical simulations. It was found that increasing temperature and concentration ratios can lead to higher levels of Joule heating, potentially affecting the transport behavior of ionic species within soft nanochannels. Overall, it was concluded that lack of control in Joule heating generation could be detrimental to the transport behavior of ions in soft nanochannels.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Chemistry, Physical
Shuang Li et al.
Summary: This study used molecular dynamics simulations to analyze the transport of water and ions in asymmetric graphene channels under the influence of an electric field. It was found that the rectification phenomenon of water and ions are closely related, and tuning the geometry of the channels can lead to high rectification ratios.
JOURNAL OF PHYSICAL CHEMISTRY B
(2021)
Article
Nanoscience & Nanotechnology
Samaneh Ayoubi et al.
Summary: The study found that electroosmotic flow can effectively reduce fouling of microchannel walls with a porous wall. By decreasing the neutral solute concentration and increasing the Sherwood number, the fouling of microchannel walls can be reduced.
MICROFLUIDICS AND NANOFLUIDICS
(2021)
Article
Mechanics
Vishal Sankar Sivasankar et al.
Summary: This paper develops a theory to demonstrate the significant enhancement of liquid transport in nanochannels with charged polyelectrolyte brushes due to thermo-osmotic effects induced by an axial temperature gradient. The induced electric field and TOS flow field are quantified, with different components of the electric field and contributions of different ions also being measured. The TOS velocity is expressed as a combination of chemiosmotic, thermal, and electro-osmotic components, with the presence of polyelectrolyte brushes leading to a massive augmentation in liquid transport compared to brush-free nanochannels.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Nanoscience & Nanotechnology
Yuan-Yi Wu et al.
Summary: This study demonstrated a smart pH-modulated two-way photoswitch that can reversibly switch ion transport under alternating light exposure over a wide pH range. The photoswitch efficiently and flexibly regulated the direction and extent of ion transport based on the pH. This two-way photoswitch showcases the considerable potential of photoresponsive polymers for intelligent bionic nanochannel devices in various applications.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Physical
Pei-Ching Tsai et al.
Summary: A simple strategy was reported to fabricate a robust mesoscale ionic diode by electrokinetic functionalization with high molecular weight poly-L-lysine on single conical mesoscale pores. Experiments demonstrated that this mesoscale ionic diode can still function effectively in mild neutral and 10 mM salt solution. The application of the exploited mesoscale ionic diode in osmotic energy harvesting showed promising results, achieving a power output up to 254 pW at neutral pH and a 1000-fold salinity gradient.
JOURNAL OF MATERIALS CHEMISTRY A
(2021)
Article
Chemistry, Physical
Mahdi Khatibi et al.
Summary: Theoretical investigation on enhancing reverse electrodialysis power generation by covering nanochannel surface with a polyelectrolyte layer (PEL) shows that increasing the charge density and thickness of PEL can result in higher power generation. This study demonstrates that by using a typical PEL with specific properties, it is possible to achieve nearly three times the maximum power density compared to bare conical nanochannels at the same salinity gradient.
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