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A K M Mahmudul Haque, Sedong Kim, Junhyo Kim, Jungpil Noh, Sunchul Huh, Byeongkeun Choi, Hanshik Chung, Hyomin Jeong
Surface modification is necessary to decrease graphene's (GN) stacking process and increase its advantageous properties. In this study, the effects of acid treatment and grinding processes on the structural integrity of GN have been studied. Morphological and structural characteristics of modified GN were investigated by field emission scanning electron microscopy, transmission electron microscopy, gas Pycnometer, particle size analyzer, X-ray diffractometer, UV-Vis spectroscopy and thermal conductivity measurement system which expose some strong evidences of the effects of purification and grinding process on GN nanoparticles in order to get GN based better nanofluid dispersed in water which gives 1...
January 1, 2018: Journal of Nanoscience and Nanotechnology
Rosa Mondragón, J Enrique Juliá, Luis Cabedo, Nuria Navarrete
Nanoparticles have been used in thermal applications to increase the specific heat of the molten salts used in Concentrated Solar Power plants for thermal energy storage. Although several mechanisms for abnormal enhancement have been proposed, they are still being investigated and more research is necessary. However, this nanoparticle-salt interaction can also be found in chemical applications in which nanoparticles have proved suitable to be used as an adsorbent for nitrate removal given their high specific surface, reactivity and ionic exchange capacity...
May 14, 2018: Scientific Reports
Neta Leibowitz, Jarrod Schiffbauer, Sinwook Park, Gilad Yossifon
We report evidence of variation in ion selectivity of a fabricated microchannel-nanochannel device resulting in the appearance of a distinct local maximum in the overlimiting chronopotentiometric response. In this system consisting of shallow microchannels joined by a nanochannel, viscous shear at the microchannel walls suppresses the electro-osmotic instability and prevents any associated contribution to the nonmonotonic response. Thus, this response is primarily electrodiffusive. Numerical simulations indicate that concentration polarization develops not only within the microchannel but also within the nanochannel itself, with a local voltage maximum in the chronopotentiometric response correlated with interfacial depletion and having the classic i^{-2} Sands time dependence...
April 2018: Physical Review. E
A I Alsabery, M A Sheremet, A J Chamkha, I Hashim
The problem of steady, laminar natural convection in a discretely heated and cooled square cavity filled by an alumina/water nanofluid with a centered heat-conducting solid block under the effects of inclined uniform magnetic field, Brownian diffusion and thermophoresis is studied numerically by using the finite difference method. Isothermal heaters and coolers are placed along the vertical walls and the bottom horizontal wall, while the upper horizontal wall is kept adiabatic. Water-based nanofluids with alumina nanoparticles are chosen for investigation...
May 9, 2018: Scientific Reports
Mubarak Ali, Ishtiaq Ahmed, Patricio Ramirez, Saima Nasir, Salvador Mafe, Christof M Niemeyer, Wolfgang Ensinger
The lithium ion recognition is receiving significant attention because of its application in pharmaceuticals, lubricants, and, especially, in energy technology. We present a nanofluidic device for specific lithium ion recognition via host-guest complexation in a confined environment. A lithium-selective receptor molecule, the aminoethyl-benzo-12-crown-4 (BC12C4-NH2) is designed and functionalized on single conical nanopores in polyethylene terephthalate (PET) membranes. The native carboxylic acid groups on the pore walls are covalently linked with the crown ether moieties and the process is monitored from the changes in the current-voltage (I-V) curves...
May 7, 2018: Analytical Chemistry
Alexsandro Kirch, James Moraes de Almeida, Caetano Rodrigues Miranda
The complexity displayed by nanofluidic-based systems involves electronic and dynamic aspects occuring across different size and time scales. To properly model such kind of system, we introduced a top-down multilevel approach, combining molecular dynamics simulations (MD) with first principles electronic transport calculations. The potential of this technique was demonstrated by investigating how the water and ionic flow through a (6,6) carbon nanotube (CNT) influences its electronic transport properties. We showed that the confinement on the CNT favors the partially hydrated Na, Cl and Li ions to exchange charge with the nanotube...
May 3, 2018: Journal of Chemical Theory and Computation
Elena Kinz, Axel Muendlein
The JAK2 V617F mutation is highly prevalent in patients with myeloproliferative neoplasms (MPN). Furthermore, it has been shown that its allelic burden correlates with hematologic characteristics, drug response, and clinical endpoints in MPN patients. Digital PCR is an emerging technology for sensitive mutation detection and quantitation, based on dilution and high-grade partitioning of a sample. Here, we describe the use of the nanofluidic chip-based QuantStudio™ 3D Digital PCR System for quantitation of the JAK2 V617F mutation...
2018: Methods in Molecular Biology
Li-Jing Cheng
Electrokinetic transport of ions between electrolyte solutions and ion permselective solid media governs a variety of applications, such as molecular separation, biological detection, and bioelectronics. These applications rely on a unique class of materials and devices to interface the ionic and electronic systems. The devices built on ion permselective materials or micro-/nanofluidic channels are arranged to work with aqueous environments capable of either manipulating charged species through applied electric fields or transducing biological responses into electronic signals...
March 2018: Biomicrofluidics
Jinsheng Zhou, Panagiotis Kondylis, Daniel G Haywood, Zachary D Harms, Lye Siang Lee, Adam Zlotnick, Stephen C Jacobson
Virus self-assembly is a critical step in the virus lifecycle. Understanding how viruses assemble and disassemble provides needed insight into developing antiviral pharmaceuticals. Few tools offer sufficient resolution to study assembly intermediates that differ in size by a few dimers. Our goal is to improve resistive-pulse sensing on nanofluidic devices to offer better particle-size and temporal resolution to study intermediates and capsids generated along the assembly pathway. To increase the particle-size resolution of the resistive-pulse technique, we measured the same, single virus particles up to a thousand times, cycling them back and forth across a series of nanopores by switching the polarity of the applied potential, i...
April 30, 2018: Analytical Chemistry
Giacomo Bruno, Nicola Di Trani, R Lyle Hood, Erika Zabre, Carly Sue Filgueira, Giancarlo Canavese, Priya Jain, Zachary Smith, Danilo Demarchi, Sharath Hosali, Alberto Pimpinelli, Mauro Ferrari, Alessandro Grattoni
Ionic transport through nanofluidic systems is a problem of fundamental interest in transport physics and has broad relevance in desalination, fuel cells, batteries, filtration, and drug delivery. When the dimension of the fluidic system approaches the size of molecules in solution, fluid properties are not homogeneous and a departure in behavior is observed with respect to continuum-based theories. Here we present a systematic study of the transport of charged and neutral small molecules in an ideal nanofluidic platform with precise channels from the sub-microscale to the ultra-nanoscale (<5 nm)...
April 27, 2018: Nature Communications
Gonzalo Perez-Mitta, Ana Peinetti, M Lorena Cortez, Maria Eugenia Toimil-Molares, Christina Trautmann, Omar Azzaroni
Molecular design of biosensors based on enzymatic processes taking place in nanofluidic elements is receiving increasing attention by the scientific community. In this work, we describe the construction of novel ultrasensitive enzymatic nanopore biosensors employing "reactive signal amplifiers" as key elements coupled to the transduction mechanism. The proposed framework not only offers innovative design concepts to amplify the detected ionic signal and develop ultrasensitive nanopore-based sensors but also to construct nanofluidic diodes displaying specific chemo-reversible rectification properties...
April 26, 2018: Nano Letters
Heon Ki Cho, Alex D Nikolov, Darsh T Wasan
Our recent experiments have demonstrated that when a bubble rises through a nanofluid (a liquid containing dispersed nanoparticles) in a vertical tube, a nanofluidic film with several particle layers is formed between the gas bubble and the glass tube wall, which significantly changes the bubble velocity due to the nanoparticle layering phenomenon in the film. We calculated the structural nanofilm viscosity as a function of the number of particle layers confined in it and found that the film viscosity increases rather steeply when the film contains only one or two particle layers...
April 19, 2018: Journal of Colloid and Interface Science
Monir Noroozi, Bijan Mohammadi, Shahidan Radiman, Azmi Zakaria
The application of optical-fiber thermal wave cavity (OF-TWC) technique was investigated to measure the thermal diffusivity of Ag nanofluids. The thermal diffusivity was obtained by measuring the thermal wavelength of sample in a cavity scan mode. The spherical Ag nanoparticles samples were prepared at various sizes using the microwave method. Applying the thermal wavelength measurement in a flexible OF-TWC technique requires only two experimental data sets. It can be used to estimate thermal diffusivity of a small amount of liquid samples (0...
2018: TheScientificWorldJournal
Xiao Hou, Mengjie Wang, Li Fu, Yapeng Chen, Nan Jiang, Cheng-Te Lin, Zhongwei Wang, Jinhong Yu
It is difficult for traditional cooling liquids to meet equipment requirements due to the high power and high integration they demand. Nanofluids are nanoparticle dispersions with high thermal conductivities, thus they have been proposed for heat transfer applications. Boron nitride nanosheets (BNNSs) possess high thermal conductivities and excellent insulation properties. Here, we fabricated BNNS nanofluids and investigated their effects on thermal conductivity enhancements. We find that BNNSs can effectively enhance the thermal conductivity of water...
April 23, 2018: Nanoscale
Won-Ho Lee, Jong-Chul Lee
A numerical simulation was developed for magnetic nanoparticles in a liquid dielectric to investigate the AC breakdown voltage of the magnetic nanofluids according to the volume concentration of the magnetic nanoparticles. In prior research, we found that the dielectric breakdown voltage of the transformer oil-based magnetic nanofluids was positively or negatively affected according to the amount of magnetic nanoparticles under a testing condition of dielectric fluids, and the trajectory of the magnetic nanoparticles in a fabricated chip was visualized to verify the related phenomena via measurements and computations...
September 1, 2018: Journal of Nanoscience and Nanotechnology
Won-Ho Lee, Sangyoup Lee, Jong-Chul Lee
Nanoparticles and nanofluids have been implemented in energy harvesting devices, and energy harvesting based on magnetic nanofluid flow was recently achieved by using a layer-built magnet and microbubble injection to induce a voltage on the order of 10-1 mV. However, this is not yet suitable for some commercial purpose. The air bubbles must be segmented in the base fluid, and the magnetic flux of the ferrofluids should change over time to increase the amount of electric voltage and current from energy harvesting...
September 1, 2018: Journal of Nanoscience and Nanotechnology
Won-Ho Lee, Se-Hee Lee, Sangyoup Lee, Jong-Chul Lee
Nanoparticles and nanofluids have been implemented in energy harvesting devices, and energy harvesting based on magnetic nanofluid flow was recently achieved by using a layer-built magnet and micro-bubble injection to induce a voltage on the order of 10-1 mV. However, this is not yet suitable for some commercial purpose. In order to further increase the amount of electric voltage and current from this energy harvesting the air bubbles must be segmented in the base fluid, and the magnetic flux of the segmented flow should be materially altered over time...
September 1, 2018: Journal of Nanoscience and Nanotechnology
Long Li, Qinggong Wang
Ionic fluids are essential to energy conversion, water desalination, drug delivery, and lab-on-a-chip devices. Ionic transport in nanoscale confinements and complex physical fields still remain elusive. Here, a nanofluidic system is developed using nanochannels of heterogeneous surface properties to investigate transport properties of ions under different temperatures. Steady ionic currents are observed under symmetric temperature gradients, which is equivalent to generating electricity using waste heat (e...
April 19, 2018: Small
Susan Amin, Ahmed Khorshid, Lili Zeng, Philip Zimny, Walter Reisner
Knots form when polymers self-entangle, a process enhanced by compaction with important implications in biological and artificial systems involving chain confinement. In particular, new experimental tools are needed to assess the impact of multiple variables influencing knotting probability. Here, we introduce a nanofluidic knot factory for efficient knot formation and detection. Knots are produced during hydrodynamic compression of single DNA molecules against barriers in a nanochannel; subsequent extension of the chain enables direct assessment of the number of independently evolving knots...
April 17, 2018: Nature Communications
Afzal Khan, Kun Huang, Ming Hu, Xuegong Yu, Deren Yang
Superhydrophobic surfaces can be fabricated by using the self-assembled nano-architecture of 3C-SiC one-dimensional (1D) nanostructures as they are capable of forming a dense network of micro/nano air pockets without any help from external sources. Herein, metal catalyzed growth of 3C-SiC nanowires/nanorods on Si substrates via vapor-liquid-solid (VLS) mechanism using five different catalysts, i.e. chemically synthesized Au nanoparticles and direct current (DC) sputtered thin films of Au, Cu, Ni and Ti are reported...
April 15, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
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