Готові списки джерел за темами / Nanofluidic Membrane

Добірка наукової літератури з теми "Nanofluidic Membrane"

Автор: Grafiati

Опубліковано: 14 березня 2023

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Статті в журналах з теми "Nanofluidic Membrane"

Rahman, Md Mushfequr. "Membranes for Osmotic Power Generation by Reverse Electrodialysis." Membranes 13, no. 2 (January 28, 2023): 164. http://dx.doi.org/10.3390/membranes13020164.

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In recent years, the utilization of the selective ion transport through porous membranes for osmotic power generation (blue energy) has received a lot of attention. The principal of power generation using the porous membranes is same as that of conventional reverse electrodialysis (RED), but nonporous ion exchange membranes are conventionally used for RED. The ion transport mechanisms through the porous and nonporous membranes are considerably different. Unlike the conventional nonporous membranes, the ion transport through the porous membranes is largely dictated by the principles of nanofluidics. This owes to the fact that the osmotic power generation via selective ion transport through porous membranes is often referred to as nanofluidic reverse electrodialysis (NRED) or nanopore-based power generation (NPG). While RED using nonporous membranes has already been implemented on a pilot-plant scale, the progress of NRED/NPG has so far been limited in the development of small-scale, novel, porous membrane materials. The aim of this review is to provide an overview of the membrane design concepts of nanofluidic porous membranes for NPG/NRED. A brief description of material design concepts of conventional nonporous membranes for RED is provided as well.

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Li, Tian, Sylvia Xin Li, Weiqing Kong, Chaoji Chen, Emily Hitz, Chao Jia, Jiaqi Dai, et al. "A nanofluidic ion regulation membrane with aligned cellulose nanofibers." Science Advances 5, no. 2 (February 2019): eaau4238. http://dx.doi.org/10.1126/sciadv.aau4238.

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The advancement of nanofluidic applications will require the identification of materials with high-conductivity nanoscale channels that can be readily obtained at massive scale. Inspired by the transpiration in mesostructured trees, we report a nanofluidic membrane consisting of densely packed cellulose nanofibers directly derived from wood. Numerous nanochannels are produced among an expansive array of one-dimensional cellulose nanofibers. The abundant functional groups of cellulose enable facile tuning of the surface charge density via chemical modification. The nanofiber-nanofiber spacing can also be tuned from ~2 to ~20 nm by structural engineering. The surface-charge-governed ionic transport region shows a high ionic conductivity plateau of ~2 mS cm−1 (up to 10 mM). The nanofluidic membrane also exhibits excellent mechanical flexibility, demonstrating stable performance even when the membrane is folded 150°. Combining the inherent advantages of cellulose, this novel class of membrane offers an environmentally responsible strategy for flexible and printable nanofluidic applications.

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Tu, Qingsong, Wice Ibrahimi, Steven Ren, James Wu, and Shaofan Li. "A Molecular Dynamics Study on Rotational Nanofluid and Its Application to Desalination." Membranes 10, no. 6 (June 6, 2020): 117. http://dx.doi.org/10.3390/membranes10060117.

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In this work, we systematically study a rotational nanofluidic device for reverse osmosis (RO) desalination by using large scale molecular dynamics modeling and simulation. Moreover, we have compared Molecular Dynamics simulation with fluid mechanics modeling. We have found that the pressure generated by the centrifugal motion of nanofluids can counterbalance the osmosis pressure developed from the concentration gradient, and hence provide a driving force to filtrate fresh water from salt water. Molecular Dynamics modeling of two different types of designs are performed and compared. Results indicate that this novel nanofluidic device is not only able to alleviate the fouling problem significantly, but it is also capable of maintaining high membrane permeability and energy efficiency. The angular velocity of the nanofluids within the device is investigated, and the critical angular velocity needed for the fluids to overcome the osmotic pressure is derived. Meanwhile, a maximal angular velocity value is also identified to avoid Taylor-Couette instability. The MD simulation results agree well with continuum modeling results obtained from fluid hydrodynamics theory, which provides a theoretical foundation for scaling up the proposed rotational osmosis device. Successful fabrication of such rotational RO membrane centrifuge may potentially revolutionize the membrane desalination technology by providing a fundamental solution to the water resource problem.

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Kim, Sungho, Ece Isenbike Ozalp, and Jeffrey A. Weldon. "Stacked Gated Nanofluidic Logic Gate Membrane." IEEE Transactions on Nanotechnology 18 (2019): 536–41. http://dx.doi.org/10.1109/tnano.2019.2917276.

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Zhang, Zhen, Panpan Zhang, Sheng Yang, Tao Zhang, Markus Löffler, Huanhuan Shi, Martin R. Lohe, and Xinliang Feng. "Oxidation promoted osmotic energy conversion in black phosphorus membranes." Proceedings of the National Academy of Sciences 117, no. 25 (June 8, 2020): 13959–66. http://dx.doi.org/10.1073/pnas.2003898117.

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Two-dimensional (2D) nanofluidic ion transporting membranes show great promise in harvesting the “blue” osmotic energy between river water and sea water. Black phosphorus (BP), an emerging layered material, has recently been explored for a wide range of ambient applications. However, little attention has been paid to the extraction of the worldwide osmotic energy, despite its large potential as an energy conversion membrane. Here, we report an experimental investigation of BP membrane in osmotic energy conversion and reveal how the oxidation of BP influences power generation. Through controllable oxidation in water, power output of the BP membrane can be largely enhanced, which can be attributed to the generated charged phosphorus compounds. Depending on the valence of oxidized BP that is associated with oxygen concentration, the power density can be precisely controlled and substantially promoted by ∼220% to 1.6 W/m2(compared with the pristine BP membrane). Moreover, through constructing a heterostructure with graphene oxide, ion selectivity of the BP membrane increases by ∼80%, contributing to enhanced charge separation efficiency and thus improved performance of ∼4.7 W/m2that outperforms most of the state-of-the-art 2D nanofluidic membranes.

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Silvestri, Antonia, Nicola Di Trani, Giancarlo Canavese, Paolo Motto Ros, Leonardo Iannucci, Sabrina Grassini, Yu Wang, Xuewu Liu, Danilo Demarchi, and Alessandro Grattoni. "Silicon Carbide-Gated Nanofluidic Membrane for Active Control of Electrokinetic Ionic Transport." Membranes 11, no. 7 (July 15, 2021): 535. http://dx.doi.org/10.3390/membranes11070535.

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Manipulation of ions and molecules by external control at the nanoscale is highly relevant to biomedical applications. We report a biocompatible electrode-embedded nanofluidic channel membrane designed for electrofluidic applications such as ionic field-effect transistors for implantable drug-delivery systems. Our nanofluidic membrane includes a polysilicon electrode electrically isolated by amorphous silicon carbide (a-SiC). The nanochannel gating performance was experimentally investigated based on the current-voltage (I-V) characteristics, leakage current, and power consumption in potassium chloride (KCl) electrolyte. We observed significant modulation of ionic diffusive transport of both positively and negatively charged ions under physical confinement of nanochannels, with low power consumption. To study the physical mechanism associated with the gating performance, we performed electrochemical impedance spectroscopy. The results showed that the flat band voltage and density of states were significantly low. In light of its remarkable performance in terms of ionic modulation and low power consumption, this new biocompatible nanofluidic membrane could lead to a new class of silicon implantable nanofluidic systems for tunable drug delivery and personalized medicine.

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Karlsson, Anders, Mattias Karlsson, Roger Karlsson, Kristin Sott, Anders Lundqvist, Michal Tokarz, and Owe Orwar. "Nanofluidic Networks Based on Surfactant Membrane Technology." Analytical Chemistry 75, no. 11 (June 2003): 2529–37. http://dx.doi.org/10.1021/ac0340206.

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Gogoi, Raj Kumar, and Kalyan Raidongia. "Intercalating cation specific self-repairing of vermiculite nanofluidic membrane." Journal of Materials Chemistry A 6, no. 44 (2018): 21990–98. http://dx.doi.org/10.1039/c8ta01885e.

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Long, Rui, Zhengfei Kuang, Zhichun Liu, and Wei Liu. "Ionic thermal up-diffusion in nanofluidic salinity-gradient energy harvesting." National Science Review 6, no. 6 (July 30, 2019): 1266–73. http://dx.doi.org/10.1093/nsr/nwz106.

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Abstract Advances in nanofabrication and materials science give a boost to the research in nanofluidic energy harvesting. Contrary to previous efforts on isothermal conditions, here a study on asymmetric temperature dependence in nanofluidic power generation is conducted. Results are somewhat counterintuitive. A negative temperature difference can significantly improve the membrane potential due to the impact of ionic thermal up-diffusion that promotes the selectivity and suppresses the ion-concentration polarization, especially at the low-concentration side, which results in dramatically enhanced electric power. A positive temperature difference lowers the membrane potential due to the impact of ionic thermal down-diffusion, although it promotes the diffusion current induced by decreased electrical resistance. Originating from the compromise of the temperature-impacted membrane potential and diffusion current, a positive temperature difference enhances the power at low transmembrane-concentration intensities and hinders the power for high transmembrane-concentration intensities. Based on the system's temperature response, we have proposed a simple and efficient way to fabricate tunable ionic voltage sources and enhance salinity-gradient energy conversion based on small nanoscale biochannels and mimetic nanochannels. These findings reveal the importance of a long-overlooked element—temperature—in nanofluidic energy harvesting and provide insights for the optimization and fabrication of high-performance nanofluidic power devices.

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Di Trani, Nicola, Antonia Silvestri, Antons Sizovs, Yu Wang, Donald R. Erm, Danilo Demarchi, Xuewu Liu, and Alessandro Grattoni. "Electrostatically gated nanofluidic membrane for ultra-low power controlled drug delivery." Lab on a Chip 20, no. 9 (2020): 1562–76. http://dx.doi.org/10.1039/d0lc00121j.

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Більше джерел

Дисертації з теми "Nanofluidic Membrane"

Stout, John Michael. "Nanofluidic Applications of Silica Membranes." BYU ScholarsArchive, 2018. https://scholarsarchive.byu.edu/etd/7040.

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This work presents membrane development applicable in nanofluidic devices. These membranes can also be termed suspended thin films, supported on two or more edges. I first discuss motivation and background for developing these structures. Then I derive the formative principles for nanofluidic systems. Following the derivation of the Navier-Stokes and Washburn equations, I discuss applying these theories to planar nanofluidic capillaries and finish the derivation by discussing the forces that drive liquid flow in nanochannels. I next discuss the membrane development process, starting with my work in static height traps, and develop the concept of analyzing nanoparticles using suspended membranes. After reviewing the lessons learned from the double-nanopore project I discuss developing an oxide layer tuned to the needs of a membrane and present the design of an adjustable membrane structure. Afterward, I discuss modeling and simulating the structure, and present a procedure for fabricating robust membranes. I then explain applying the membrane structure to form a nanofluidic pump and document the process for recording and analyzing the pumping characteristics for nanodevices. As part of the pump section I propose a theory and model for predicting the behavior of the pumps. I next present applying active membranes as nanoparticle traps. I document a quick-turn optical profilometry method for charicterizing the devices, then present experimental data involving trapping. Early results show that the device functions as a nanoparticle concentrator and may work well as a size-based trap for nanoparticles. I conclude by summarizing the main contributions made during my course of study and by providing supplemental material to guide future research.

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Pardon, Gaspard. "From Macro to Nano : Electrokinetic Transport and Surface Control." Doctoral thesis, KTH, Mikro- och nanosystemteknik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-144994.

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Today, the growing and aging population, and the rise of new global threats on human health puts an increasing demand on the healthcare system and calls for preventive actions. To make existing medical treatments more efficient and widely accessible and to prevent the emergence of new threats such as drug-resistant bacteria, improved diagnostic technologies are needed. Potential solutions to address these medical challenges could come from the development of novel lab-on-chip (LoC) for point-of-care (PoC) diagnostics. At the same time, the increasing demand for sustainable energy calls for the development of novel approaches for energy conversion and storage systems (ECS), to which micro- and nanotechnologies could also contribute. This thesis has for objective to contribute to these developments and presents the results of interdisciplinary research at the crossing of three disciplines of physics and engineering: electrokinetic transport in fluids, manufacturing of micro- and nanofluidic systems, and surface control and modification. By combining knowledge from each of these disciplines, novel solutions and functionalities were developed at the macro-, micro- and nanoscale, towards applications in PoC diagnostics and ECS systems. At the macroscale, electrokinetic transport was applied to the development of a novel PoC sampler for the efficient capture of exhaled breath aerosol onto a microfluidic platform. At the microscale, several methods for polymer micromanufacturing and surface modification were developed. Using direct photolithography in off-stoichiometry thiol-ene (OSTE) polymers, a novel manufacturing method for mold-free rapid prototyping of microfluidic devices was developed. An investigation of the photolithography of OSTE polymers revealed that a novel photopatterning mechanism arises from the off-stoichiometric polymer formulation. Using photografting on OSTE surfaces, a novel surface modification method was developed for the photopatterning of the surface energy. Finally, a novel method was developed for single-step microstructuring and micropatterning of surface energy, using a molecular self-alignment process resulting in spontaneous mimicking, in the replica, of the surface energy of the mold. At the nanoscale, several solutions for the study of electrokinetic transport toward selective biofiltration and energy conversion were developed. A novel, comprehensive model was developed for electrostatic gating of the electrokinetic transport in nanofluidics. A novel method for the manufacturing of electrostatically-gated nanofluidic membranes was developed, using atomic layer deposition (ALD) in deep anodic alumina oxide (AAO) nanopores. Finally, a preliminary investigation of the nanopatterning of OSTE polymers was performed for the manufacturing of polymer nanofluidic devices.

QC 20140509

Rappid
NanoGate
Norosensor

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Smith, Ross Andrew. "Biomedical Applications Employing Microfabricated Silicon Nanoporous Membranes." Case Western Reserve University School of Graduate Studies / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=case1278705155.

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Jouenne, Vincent. "Nanocristaux de dioxyde de titane à morphologie contrôlée : synthèse, suspensions colloïdales et dépôt par électrophorèse." Nantes, 2013. http://archive.bu.univ-nantes.fr/pollux/show.action?id=c3b26761-dabc-43ff-ab7b-2fe3f95f0dd4.

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Le dioxyde de titane, doté de propriétés photoactives uniques, est un matériau clé dans la fabrication d’une cellule photovoltaïque de IIIème génération. Dans la stratégie envisagée à l’IMN, son intégration optimale dans ce dispositif nécessite l’élaboration d’une fine couche dense de TiO2 surmontée par un dépôt nanostructuré et poreux. Afin de fabriquer ces deux couches, un procédé à basse température (< 200°C) a été développé. La première étape de ce travail a porté sur l’étude de la synthèse exploitant l’hydrolyse du précurseur [Ti8O12(H2O)24]Cl8. HCl. 7H2O en milieu alcoolique et en présence de surfactants dans des conditions solvothermales. Diverses morphologies de nanocristaux de TiO2 anatase (sphère, barre, plaquette rhombique) avec une bonne cristallinité ont pu être obtenues en présence d’acide oléique et/ou d’oleylamine et contrôlées par un choix judicieux des paramètres, en particulier le rapport molaire entre ces deux surfactants. Ensuite, la surface de ces cristaux a été caractérisée puis optimisée pour permettre la préparation de suspensions colloïdales stables dans des solvants appropriés pour le dépôt par voie humide ou par électrophorèse. Des dépôts denses d’une épaisseur de 25 à 60 nm ont été réalisés par enduction centrifuge alors que des dépôts poreux d’épaisseur modulable (70 nm à 2,2 μm) ont pu être réalisés par électrophorèse sur substrats plans. Enfin, la formation de nano-pilliers de TiO2 (diamètre ~ 150-200 nm, L ~ 1–3 μm) a été effectuée par électrophorèse confinée dans les pores de membranes nanoporeuses
Titanium dioxide, owing unique photoactive properties, is a key material for the fabrication of a IIIrd generation photovoltaic cell. In the strategy developed in IMN, its optimal incorporation in this device requires the elaboration of a thin and dense TiO2 layer surmounted by a nanostructured and porous layer. To make these deposits, a low temperature process (< 200°C) has been developed. First of all, this work has concerned the study of a synthetic strategy based on the hydrolysis of the [Ti8O12(H2O)24]Cl8. HCl. 7H2O precursor in alcoholic media with surfactants in solvothermal conditions. Many different TiO2 anatase nanocrystal morphologies (spherical, rod-like, rhombic platelets) with a good cristallinity have been obtained with both, oleic acid and/or oleylamine, as surfactants and controlled with a judicious choice of experimental parameters, such as the molar ratio between these two surfactants. Then, the surface nanocrystals has been characterized and optimized to allow the preparation of stable colloidal solutions in appropriated solvents in order to elaborate deposits by wet or electrophoretic (EPD) routes. Dense TiO2 layers with a 25 to 60 nm thickness have been realized by spin-coating, whereas porous deposits with tunable thickness (from 70 nm to 2. 2 μm) have been performed by EPD on plane substrates. Finally, the formation of TiO2 nanopillars (diameter ~ 150-200 nm, L ~ 1–3 μm), by electrophoresis confined inside the pores of nanoporous templates, has been performed

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Tsung-ChenTsai and 蔡宗承. "Power Generation by Reverse Electrodialysis in Nanopore Membranes from a Microfluidic and Nanofluidic System." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/02664774512989023119.

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Rankin, Daniel Justin. "Entrance effects on solution transport through nanoporous membranes." Thesis, 2019. http://hdl.handle.net/2440/119956.

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Solution transport across nanoporous membranes occurs in many different biologically and industrially relevant processes such as filtration of waste by the kidneys and desalination of seawater. The same theoretical framework can be used to understand both of these processes, as well as many others. In general, a flux of solution is driven across a porous membrane due to an externally applied force. This external force can be a gradient in pressure, temperature, concentration, or electrical potential. At the entrance and exit of a pore the fluid streamlines and electric field lines experience a significant constriction in going from the bulk reservoirs to the narrow pores. This effect can become significant for short pores and pores with low friction and thus must be appropriately taken into account to correctly predict solution fluxes. In the first study, continuum mechanics is used to investigate the entrance effects on charge flux of electrolytes across porous membranes. The access electrical resistance, which is the electrical resistance associated with the electric field lines bending into and out of the pores, has previously been shown to make up a significant fraction of the total electrical resistance when the fluid–pore friction is low.1 Although several papers have studied the access electrical resistance,2–5 none has explicitly considered the effect of surface charge on the surfaces of the membrane facing the bulk solution even though this charge has been shown to have a significant effect on the access electrical resistance.6 In this thesis, finite element method (FEM) calculations are carried out in order to systematically study the access electrical resistance of charged pores in charged and uncharged membranes. The results are compared with predictions from two existing continuum-based theories and a new theory derived in this thesis. It is found that the FEM results agree with different theories depending on whether or not the outer-membrane surface is charged. In the second study an existing molecular dynamics (MD) algorithm is used to simulate concentration differences across pores connected to bulk reservoirs. The algorithm is found to require a modification at high solute concentrations, which had not previously been considered. In the third study the modified MD algorithm is used to investigate possible non-continuum and non-ideal effects on concentration-gradient-driven flows at high solute concentrations. Entrance effects are considered in the context of diffusio-osmotic flows, which are flows driven by forces acting on the inhomogeneous fluid layer near the membrane pore surfaces as a result of an applied concentration gradient. The access diffusio-osmotic resistance, which is the resistance to the diffusio-osmotic flux associated with the fluid streamlines bending into and out of the pores, is calculated and compared with a new theory that is derived in this thesis. The assumptions made in deriving the new theory include, amongst others a dilute solution and continuum theory. Despite these assumptions, the theory predicts the correct scaling of the MD results at two different high solute concentrations. It is found that both electrical and diffusio-osmotic access resistances can be separated from their respective total (access and pore) resistances. Depending on whether the length scales of interest, such as the pore radius, are comparable with the pore length, the access resistance can be a significant factor in determining the total resistance of the system. This is explored in this thesis in the context of both electrical and diffusio-omsotic resistance, which affect a wide range of different systems.
Thesis (MPhil) -- University of Adelaide, School of Physical Sciences, 2019

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(10712010), Harsharaj Birendrasi Parmar. "NANOMATERIALS FOR HIGH EFFICIENCY MEMBRANE DISTILLATION." Thesis, 2021.

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Thermal desalination of high salinity water resources is crucial for increasing freshwater supply, but efficiency enhancements are badly needed. Nanomaterial enhancements and novel condensation regimes offer enormous potential for improving promising technologies like membrane distillation (MD). In this work, we first examined nanofluids for MD, including the role of nanoscale physics, and model system-level energy efficiency enhancements. Our model included the dominant micro-mixing from Brownian motion in fine particle nanofluids (copper oxide) and the unusually high axial conduction from phonon resonance through Van der Waals interaction in carbon nanotube nanofluids. Carbon nanotubes resulted in a consistent, wide range of improvements; while copper oxide particles showcased diminishing returns after a concentration of 0.7%, where Brownian motion effects reduced. However, the enhancements at higher concentrations from liquid layering around nanoparticles were impractical in MD, since the related high surfactant levels compromised the membrane hydrophobicity and promoted fouling. Dilute solutions of metallic nanofluids can be actively integrated to enhance the performance of MD, whereas stronger nanofluid solutions should be limited to heat exchangers that supply thermal energy to MD systems. We then investigated slippery liquid infused porous surfaces (SLIPS) for enhanced condensation rates in MD. Dropwise condensation heat transfer was modelled considering the effects of the departing, minimum droplet radii and the interfacial thermal resistances. Effective droplet shedding from these surfaces led to an experimental thermal efficiency of 95%. Alternatively, porous condensers with superior wicking properties and conductive heat transfer offered a robust solution to high salinity desalination. We modelled the onset of flooding in porous condensers using Darcy’s law for porous media, including the effects of the condenser permeability and determined the optimal condenser thickness at varying system length scales. The increased active area of condensation resulted in a significant enhancement (96.5%) in permeate production and 31.7% improvement in experimental thermal efficiency. However, porous condensers were only compatible with flat plate module designs limiting their practicality.

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Книги з теми "Nanofluidic Membrane"

Miller, Scott Allan. Nanofluidics in tailored carbon nanotube membranes. 2004.

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Частини книг з теми "Nanofluidic Membrane"

Saggere, Laxman. "Membrane Actuation for Micropumps." In Encyclopedia of Microfluidics and Nanofluidics, 1741–46. New York, NY: Springer New York, 2015. http://dx.doi.org/10.1007/978-1-4614-5491-5_871.

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Saggere, Laxman. "Membrane Actuation for Micropumps." In Encyclopedia of Microfluidics and Nanofluidics, 1–7. Boston, MA: Springer US, 2014. http://dx.doi.org/10.1007/978-3-642-27758-0_871-2.

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Peterson, Dominic S. "Ion Exchange Membranes." In Encyclopedia of Microfluidics and Nanofluidics, 1459–62. New York, NY: Springer New York, 2015. http://dx.doi.org/10.1007/978-1-4614-5491-5_739.

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Peterson, Dominic S. "Ion Exchange Membranes." In Encyclopedia of Microfluidics and Nanofluidics, 1–5. Boston, MA: Springer US, 2014. http://dx.doi.org/10.1007/978-3-642-27758-0_739-2.

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Marand, Eva, Anil Surapathi, J. Karl Johnson, Prashant Kumar, and Chandrashekar Shankar. "Review: Nanofluidic and Gas Transport in Carbon Nanotube Membranes." In Advanced Materials for Membrane Preparation, 50–63. Bentham Science Publishers Ltd., 2012. http://dx.doi.org/10.2174/978160805308711201010050.

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Bakajin, Olgica, Aleksandr Noy, Francesco Fornasiero, Costas P. Grigoropoulos, Jason K. Holt, Jung Bin In, Sangil Kim, and Hyung Gyu Park. "Nanofluidic Carbon Nanotube Membranes." In Nanotechnology Applications for Clean Water, 173–88. Elsevier, 2014. http://dx.doi.org/10.1016/b978-1-4557-3116-9.00011-1.

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"Heterogeneous Membrane." In Encyclopedia of Microfluidics and Nanofluidics, 1300. New York, NY: Springer New York, 2015. http://dx.doi.org/10.1007/978-1-4614-5491-5_200100.

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"Bipolar Membrane." In Encyclopedia of Microfluidics and Nanofluidics, 178. New York, NY: Springer New York, 2015. http://dx.doi.org/10.1007/978-1-4614-5491-5_200388.

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"Anion Exchange Membrane." In Encyclopedia of Microfluidics and Nanofluidics, 65. New York, NY: Springer New York, 2015. http://dx.doi.org/10.1007/978-1-4614-5491-5_200315.

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"Cation Exchange Membrane." In Encyclopedia of Microfluidics and Nanofluidics, 294–95. New York, NY: Springer New York, 2015. http://dx.doi.org/10.1007/978-1-4614-5491-5_200345.

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Тези доповідей конференцій з теми "Nanofluidic Membrane"

Stagg, Grant, Rachel Harris, Hollis Belnap, and Aaron Hawkins. "Nanoscale Electrostatic Membrane Actuation for Nanofluidic Pumping." In 2020 Intermountain Engineering, Technology and Computing (IETC). IEEE, 2020. http://dx.doi.org/10.1109/ietc47856.2020.9249148.

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Kim, Sung Jae, Wonseok Kim, Jungeun Lee, and Gun Yong Sung. "VISUALIZATION OF ION LIGHTNING THROUGH NANOFLUIDIC MEMBRANE." In The 7th International Multidisciplinary Conference on Optofluidics 2017. Basel, Switzerland: MDPI, 2017. http://dx.doi.org/10.3390/optofluidics2017-04181.

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Wang, Shuo, Huaiqiang Yu, Wei Wang, and Zhihong Li. "Nanofluidic device with self-assembled nafion membrane utilizing capillary valve." In 2012 7th IEEE International Conference on Nano/Micro Engineered and Molecular Systems (NEMS). IEEE, 2012. http://dx.doi.org/10.1109/nems.2012.6196861.

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Anwar, Khalid, Taeheon Han, and Sun Min Kim. "An Integrated Micro/Nanofluidic System for Processing of Protein Samples." In ASME-JSME-KSME 2011 Joint Fluids Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajk2011-36036.

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In this study, an integrated micro/nanofluidic system for protein analysis was presented. The device is comprised of a micromixer and a preconcentrator with a separation column. The integrated micromixer based on unbalanced split and cross collision of fluid streams is passive and planar, which is easy to fabricate and integrate to the microfluidic system. The preconcentrator has nanochannels formed by the electrical breakdown of polydimethylsiloxane (PDMS) membrane using a high electrical shock, without any nano-lithographic process. Micromixer and preconcentrator were used for sample preparation (tagging of protein for detection) and concentration of protein, consecutively. Proteins were electrokinetically trapped near the junction of micro/nanochannels.

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Sundaresan, Vishnu Baba, and James Patrick Carr. "Active Nanoporous Membranes for Desalination." In ASME 2011 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2011. http://dx.doi.org/10.1115/smasis2011-5193.

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Current water desalination technologies such as reverse osmosis (RO) and nanofiltration (NF) use tortuous structures and cylindrical nanopores to reject salts by size exclusion. The selective rejection of salts dissolved in water using nanopores requires large pressure gradients across the membranes to produce reasonable flow rates. The electrical power required for generating large pressure gradients increases the operational cost for desalination and limits its application as portable units in small communities and in third-world countries. Further, recently proposed desalination methods using carbon nanotubes and nanofluidic diodes have limited lifetime due to clogging and fouling from contaminants in feed water. Thus, existing or evolving technologies are expensive, bulky and not practical where it is needed the most. In order to develop a desalination system that is not limited by the disadvantages of existing systems, this article investigates the feasibility of a novel active nanopore membrane with superior ion rejection and water transport properties. An active nanopore is a shape-changing hyperboloidal pore that is formed in a rugged electroactive composite membrane and utilizes coupled electrostatic, hydrodynamic and mechanical interactions due to reversible mechanical oscillations between the charged pore walls and dissolved ions in water for desalination. This novel approach takes advantage of the shape of the pore to create a pumping action in the hyperboloidal channel to selectively transport water molecules. In order to demonstrate the applicability of this novel concept for water desalination, the paper will use a theoretical model to model the ion rejection properties and flow rate of salt-free water through an active nanoporous membrane.

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Sundaresan, Vishnu-Baba. "Frequency Dependent Ion Rejection Properties of Active Nanoporous Membranes." In ASME 2013 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/smasis2013-3202.

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Selective rejection of dissolved salts in water is achieved by large pressure gradient driven flows through tortuous structures and cylindrical nanopores. The flow rate through the membrane is dependent on the area of the membrane and pressure gradient that can be sustained by the membrane. The electrical power required for generating large pressure gradients increases the operational cost for desalination units and limits application of contemporary technologies in a wide variety of applications. Due to this limitation, small scale operation of these desalination systems is not economical and portable. Further, recently proposed desalination systems using carbon nanotubes and nanofluidic diodes have limited lifetime due to clogging and fouling from contaminants in feed water. In order to develop a desalination system that is not limited by cost, scale of operation and application, an active nanopore membrane that uses multiphysics interactions in a surface-functionalized hyperboloidal nanopore is developed. An active nanopore is a shape-changing hyperboloidal pore that is formed in a rugged electroactive composite membrane and utilizes coupled electrostatic, hydrodynamic and mechanical interactions due to reversible mechanical oscillations between the charged pore walls and dissolved ions in water for desalination. This novel approach takes advantage of the shape of the pore to create a pumping action in the hyperboloidal channel to selectively transport water molecules. In order to demonstrate the applicability of this novel concept for water desalination, the paper will use a theoretical model to model the ion rejection properties and flow rate of purified water through an active nanoporous membrane. This article examines the effect of the geometry of the nanopore and frequency of operation to reject dissolved ions in water through a multiphysics model. It is estimated that the neck diameter of the active nanopores is the most dominant geometrical feature for achieving ion rejection, and the flux linearly increases with the frequency of operation (between 2–50Hz). The threshold neck diameter of the nanopore required for achieving rejection from multiphysics simulation is observed to be 100nm. The flux through the membrane decreases significantly with decreasing diameter and becomes negligible at 10nm effective neck diameter.

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Leeladhar, Rajesh, Wei Xu, and Chang-Hwan Choi. "Effects of Nanofluids on Droplet Evaporation and Wetting on Nanoporous Superhydrophobic Surfaces." In ASME 2009 Second International Conference on Micro/Nanoscale Heat and Mass Transfer. ASMEDC, 2009. http://dx.doi.org/10.1115/mnhmt2009-18551.

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In this paper, nanofluid droplets (fluid containing metal nanoparticles) were subjected to evaporation on a nanoporous superhydrophobic surface to study the effects of nanoparticles on evaporation kinetics, wetting dynamics, and dry-out patterns. Metal nanoparticles (gold chloride) of three different sizes (10, 100, and 250 nm) at three different concentrations (0.001, 0.01, and 0.1% wt) were tested as nanofluids, uniformly dispersed in deionized water. Anodized alumina membranes (200 nm in pore diameter) were tested as nanoporous superhydrophobic surfaces, coated with a self assembled monolayer (SAM). During the course of evaporation in a room condition, the change of a contact angle, contact diameter, height, and volume was measured by a goniometer and compared with that of the base fluid (water) taken as a control. The initial equilibrium contact angle of the nanofluids was significantly affected by the nanoparticle sizes and concentrations. During evaporation, the evaporation behavior for the nanofluids exhibited a complete different mode from that of the base fluid. In terms of a contact angle, nanofluids showed slower decrease rate than base fluid. Nanofluid contact diameter remained almost a constant throughout evaporation with a slight change only at the very end of evaporation stage, whereas the base fluid showed a sequence of constant, increase, and mixed states of increase/decrease behavior. The nanofluids also showed a clear distinction in the evaporation rates, resulting in slower rate than base fluid. The variation of the nanoparticle sizes and concentrations did not make significant difference in the evaporation rate within the tested conditions. No abrupt change in a contact angle and diameter was observed during the evaporation, suggesting that no remarkable wetting transition from Cassie (de-wetting) to Wenzel (wetting) state occurred. The scanning electron microscope (SEM) images of the deposited nanoparticles after complete evaporation of solvent showed unique dry-out patterns depending on nanoparticle sizes and concentrations, e.g., a thick ring-like pattern with larger particle sizes while a uniformly distributed pattern with smaller particles at higher concentrations.

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Smith, Sonya T., and Richard Chadwick. "Nanofluidics of Mammalian Hearing." In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-64729.

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The inner hair cell stereocilia bundle performs the role of transducer in mammalian hearing. Acoustic stimuli deflect the hair bundle to open ion channels, resulting in cation influx and the subsequent release of a neurotransmitter at the base of the cell. Hypotheses for this transduction include fluid shear-driven motion between the tectorial membrane and the reticular lamina to deflect the bundle. It is presumed that ‘molecular gates’ sense tension in tip-links that connect adjacent stepped rows of stereocilia to open the channels. However, almost nothing is known about the endolymphatic flow in the micron-sized gap surrounding the bundle and the nanoscale sized gaps between individual stereocilia rows and between individual bundles. Here we show with nanometer resolution, how each row of stereocilia, their associated tip links and gates and the corresponding flow patterns move in response to acoustical input.

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Mohruni, Amrifan Saladin, Erna Yuliwati, Safian Sharif, and Ahmad Fauzi Ismail. "Membrane technology for treating of waste nanofluids coolant: A review." In 3RD ELECTRONIC AND GREEN MATERIALS INTERNATIONAL CONFERENCE 2017 (EGM 2017). Author(s), 2017. http://dx.doi.org/10.1063/1.5002284.

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Wu, Songmei, Fabien Wildhaber, Arnaud Bertsch, Juergen Brugger, and Philippe Renaud. "Al2O3/W hetero-structured nanopore membranes: From native to tunable nanofluidic diodes." In 2013 8th IEEE International Conference on Nano/Micro Engineered and Molecular Systems (NEMS). IEEE, 2013. http://dx.doi.org/10.1109/nems.2013.6559890.

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