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Nanofluid

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https://www.readbyqxmd.com/read/28323639/the-effect-of-boundary-slippage-and-nonlinear-rheological-response-on-flow-of-nanoconfined-water
#1
Amandeep Sekhon, V J Ajith, Shivprasad Vitthal Patil
The flow of water confined to nanometer-sized pores is central to a wide range of subjects from biology to nanofluidic devices. Despite its importance, a clear picture about nanoscale fluid dynamics is yet to emerge. Here we measured dissipation in less than 20 nm thick water films and it was found to decrease for both wetting and non-wetting confining surfaces. The fitting of Carreau-Yasuda model of shear thinning to our measurements implies that flow is non-Newtonian and for wetting surfaces the no-slip boundary condition is valid...
March 21, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28322562/massively-enhanced-electroosmotic-transport-in-nanochannels-grafted-with-end-charged-polyelectrolyte-brushes
#2
Guang Chen, Siddhartha Das
We establish that nanochannels grafted with pH-responsive, end-charged polyelectrolyte (PE) brushes demonstrate a massive augmentation in the strength of the electroosmotic (EOS) transport in presence of an external electric field. This contradicts the existing understanding that the EOS transport is severely retarded in channels grafted with the PE brushes due to the brush-induced enhanced drag force. Our mathematical model, developed on the basis of the fact that the ion concentration polarization (ICP) effect can be neglected, explains this enhancement of the EOS transport by noting that the end-charged PE brushes demonstrate a unique ability of localizing the electric double layer (or the EDL) or equivalently localizing the maximum charge density of the electrolyte ions at the location of its end, i...
March 21, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28322548/nanofluidic-devices-with-8-pores-in-series-for-real-time-resistive-pulse-analysis-of-hepatitis-b-virus-capsid-assembly
#3
Panagiotis Kondylis, Jinsheng Zhou, Zachary D Harms, Andrew R Kneller, Lye Siang Lee, Adam Zlotnick, Stephen C Jacobson
To improve the precision of resistive-pulse measurements, we have used a focused ion beam instrument to mill nanofluidic devices with 2, 4, and 8 pores in series and compared their performance. The in-plane design facilitates the fabrication of multiple pores in series, which, in turn, permits averaging of the series of pulses generated from each translocation event. The standard deviations (σ) of the pulse amplitude distributions decrease by 2.7-fold when the average amplitudes of eight pulses are compared to the amplitudes of single pulses...
March 21, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28319839/escherichia-coli-removal-from-model-substrates-underlying-mechanism-based-on-nanofluid-structural-forces
#4
Jiyoung Shim, Alex Nikolov, Darsh Wasan
Understanding the interactions between bacteria and solid surfaces that result in bacterial adhesion and removal is of immense importance for reducing foodborne illness outbreaks. A nanofluid formulation comprised of a sodium dodecyl sulfate (SDS) micellar aqueous solution in the presence of an organic acid (as a pH controller) was used to test the E. coli K12 removal from two substrates, polyvinylchloride (PVC) and partially hydrophobic glass. We investigated the bacterial removal efficacy based on the combined effect of the nanofluid's structural forces and bacterial isoelectric point...
March 12, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28298681/effects-of-thermal-processing-by-nanofluids-on-vitamin-c-total-phenolics-and-total-soluble-solids-of-tomato-juice
#5
S M Jafari, S S Jabari, D Dehnad, S A Shahidi
In this research, our main idea was to apply thermal processing by nanofluids instead of conventional pasteurization processes, to shorten duration of thermal procedure and improve nutritional contents of fruit juices. Three different variables of temperature (70, 80 and 90 °C), nanofluid concentration (0, 2 and 4%) and time (30, 60 and 90 s) were selected for thermal processing of tomato juices by a shell and tube heat exchanger. The results demonstrated that 4% nanofluid concentration, at 30 °C for 30 s could result in 66% vitamin C retention of fresh juice while it was about 56% for the minimum nanofluid concentration and maximum temperature and time...
March 2017: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/28297643/effects-of-polymer-length-and-salt-concentration-on-the-transport-of-ssdna-in-nanofluidic-channels
#6
Weixin Qian, Kentaro Doi, Satoyuki Kawano
Electrokinetic phenomena in micro/nanofluidic channels have attracted considerable attention because precise control of molecular transport in liquids is required to optically and electrically capture the behavior of single molecules. However, the detailed mechanisms of polymer transport influenced by electroosmotic flows and electric fields in micro/nanofluidic channels have not yet been elucidated. In this study, a Langevin dynamics simulation was used to investigate the electrokinetic transport of single-stranded DNA (ssDNA) in a cylindrical nanochannel, employing a coarse-grained bead-spring model that quantitatively reproduced the radius of gyration, diffusion coefficient, and electrophoretic mobility of the polymer...
March 14, 2017: Biophysical Journal
https://www.readbyqxmd.com/read/28294582/pioneering-medical-advances-through-nanofluidic-implantable-technologies
#7
REVIEW
R Lyle Hood, Gold Darr Hood, Mauro Ferrari, Alessandro Grattoni
Nanofluidic implantables represent a recent advance in a broad effort for developing personalized, point-of-care medical technologies. Such systems have unprecedented potential when matched with the newest developments in robotics, microprocessing, and tissue engineering. In this review, we present their emergence in medicine within the fields of diagnostics, biosensing, therapeutics, and theranostics. Discussion includes current limitations and future directions for these systems, as commensurate advances in power density and electronic processing are continually redefining the possible...
March 10, 2017: Wiley Interdisciplinary Reviews. Nanomedicine and Nanobiotechnology
https://www.readbyqxmd.com/read/28278581/application-of-new-zno-nanoformulation-and-ag-fe-zno-nanocomposites-as-water-based-nanofluids-to-consider-in-vitro-cytotoxic-effects-against-mcf-7-breast-cancer-cells
#8
Mohammad Hossein Abdolmohammadi, Faranak Fallahian, Zahra Fakhroueian, Mozhgan Kamalian, Peyman Keyhanvar, Faraz M Harsini, Azizollah Shafiekhani
Novel formulations of nanocomposites derived from ZnO nanoparticles have provided potential biomedical applications as a new strategy for treatment of breast cancer. In this research, two types of ZnO nanomaterials were synthesized by sol-gel hydrothermal process and co-precipitation containing fast quenching and also surface modification methods. The cytotoxic effects on growth of the breast cancer cell lines MCF-7 were evaluated by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide (MTT) assay...
February 20, 2017: Artificial Cells, Nanomedicine, and Biotechnology
https://www.readbyqxmd.com/read/28271101/bubble-nucleation-and-growth-in-nanochannels
#9
Bo Bao, Seyed Hadi Zandavi, Huawei Li, Junjie Zhong, Arnav Jatukaran, Farshid Mostowfi, David Sinton
We apply micro- and nanofluidics to study fundamental phase change behaviour at nanoscales, as relevant to shale gas/oil production. We investigate hydrocarbon phase transition in sub-100 nm channels under conditions that mimic the pressure drawdown process. Measured cavitation pressures are compared with those predicted from the nucleation theory. We find that cavitation pressure in the nanochannels corresponds closer to the spinodal limit than that predicted from classical nucleation theory. This deviation indicates that hydrocarbons remain in the liquid phase in nano-sized pores under pressures much lower than the saturation pressure...
March 8, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28252968/step-wise-velocity-of-an-air-bubble-rising-in-a-vertical-tube-filled-with-a-liquid-dispersion-of-nanoparticles
#10
Heon Ki Cho, Alex D Nikolov, Darsh T Wasan
The motion of air bubbles in tubes filled with aqueous suspensions of nanoparticles (nanofluids) is of practical interest for bubble jets, lab-on-a-chip, and transporting media. Therefore, the focus of this study is the dynamics of air bubbles rising in a tube in a nanofluid. Many authors experimentally and analytically proposed that the velocity of rising air bubbles is constant for long air bubbles suspended in a vertical tube in common liquids (e.g. an aqueous glycerol solution) when the capillary number is larger than 10(-4)...
March 21, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28231298/a-revised-model-for-jeffrey-nanofluid-subject-to-convective-condition-and-heat-generation-absorption
#11
Tasawar Hayat, Arsalan Aziz, Taseer Muhammad, Ahmed Alsaedi
Here magnetohydrodynamic (MHD) boundary layer flow of Jeffrey nanofluid by a nonlinear stretching surface is addressed. Heat generation/absorption and convective surface condition effects are considered. Novel features of Brownian motion and thermophoresis are present. A non-uniform applied magnetic field is employed. Boundary layer and small magnetic Reynolds number assumptions are employed in the formulation. A newly developed condition with zero nanoparticles mass flux is imposed. The resulting nonlinear systems are solved...
2017: PloS One
https://www.readbyqxmd.com/read/28230533/thermophoretic-transport-of-ionic-liquid-droplets-in-carbon-nanotubes
#12
Rakesh Rajegowda, Sridhar Kumar Kannam, Remco Hartkamp, Sarith P Sathian
Thermal-gradient induced transport of ionic liquid (IL) and water droplets through a carbon nanotube (CNT) is investigated in this study using molecular dynamics simulations. Energetic analysis indicates that IL transport through a CNT is driven primarily by the fluid-solid interaction, while fluid-fluid interactions dominate in water-CNT systems. Droplet diffusion analysis via the moment scaling spectrum reveals sub-diffusive motion of the IL droplet, in contrast to the self-diffusive motion of the water droplet...
April 18, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28229955/three-dimensional-colloidal-lithography
#13
Hironori Nagai, Austen Poteet, Xu A Zhang, Chih-Hao Chang
Light interactions with colloidal particles can generate a variety of complex three-dimensional (3D) intensity patterns, which can be utilized for nanolithography. The study of particle-light interactions can add more types of intensity patterns by manipulating key factors. Here we investigate a novel 3D nanolithography technique using colloidal particles under two-beam coherent illuminations. The fabricated 3D nanostructures are hollow, nested within periodic structures, and possess multiple chamber geometry...
March 24, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28226213/oscillatory-reaction-induced-periodic-c-quadruplex-dna-gating-of-artificial-ion-channels
#14
Jian Wang, Ruochen Fang, Jue Hou, Huacheng Zhang, Ye Tian, Huanting Wang, Lei Jiang
Many biological ion channels controlled by biochemical reactions have autonomous and periodic gating functions, which play important roles in continuous mass transport and signal transmission in living systems. Inspired by these functional biological ion channel systems, here we report an artificial self-oscillating nanochannel system that can autonomously and periodically control its gating process under constant conditions. The system is constructed by integrating a chemical oscillator, consisting of BrO3(-), Fe(CN)6(4-), H(+), and SO3(2-), into a synthetic proton-sensitive nanochannel modified with C-quadruplex (C4) DNA motors...
February 27, 2017: ACS Nano
https://www.readbyqxmd.com/read/28209025/cmos-compatible-fabrication-for-photonic-crystal-based-nanofluidic-structure
#15
Wang Peng, Youping Chen, Wu Ai, Dailin Zhang, Han Song, Hui Xiong, Pengcheng Huang
Photonic crystal (PC)-based devices have been widely used since 1990s, while PC has just stepped into the research area of nanofluidic. In this paper, photonic crystal had been used as a complementary metal oxide semiconductors (CMOS) compatible part to create a nanofluidic structure. A nanofluidic structure prototype had been fabricated with CMOS-compatible techniques. The nanofluidic channels were sealed by direct bonding polydimethylsiloxane (PDMS) and the periodic gratings on photonic crystal structure...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28208271/cation-dependent-surface-charge-regulation-in-gated-nanofluidic-devices
#16
Marie Fuest, Kaushik K Rangharajan, Caitlin Boone, A T Conlisk, Shaurya Prakash
Surface charge governs nanoscale aqueous electrolyte transport, both in engineered analytical systems and in biological entities such as ion channels and ion pumps as a function of ion type and concentration. Embedded electrodes in a nanofluidic channel, isolated from the fluid in the channel by a dielectric layer, act as active, tunable gates to systematically modify local surface charge density at the interface between the nanochannel surface and the aqueous electrolyte solution, causing significant changes in measured nanochannel conductance...
February 7, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28196473/2-7-million-samples-genotyped-for-hla-by-next-generation-sequencing-lessons-learned
#17
Gerhard Schöfl, Kathrin Lang, Philipp Quenzel, Irina Böhme, Jürgen Sauter, Jan A Hofmann, Julia Pingel, Alexander H Schmidt, Vinzenz Lange
BACKGROUND: At the DKMS Life Science Lab, Next Generation Sequencing (NGS) has been used for ultra-high-volume high-resolution genotyping of HLA loci for the last three and a half years. Here, we report on our experiences in genotyping the HLA, CCR5, ABO, RHD and KIR genes using a direct amplicon sequencing approach on Illumina MiSeq and HiSeq 2500 instruments. RESULTS: Between January 2013 and June 2016, 2,714,110 samples largely from German, Polish and UK-based potential stem cell donors have been processed...
February 14, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28195288/slip-divergence-of-water-flow-in-graphene-nanochannels-the-role-of-chirality
#18
Enrique Wagemann, Elton Oyarzua, Jens H Walther, Harvey A Zambrano
Graphene has attracted considerable attention due to its characteristics as a 2D material and its fascinating properties, providing a potential building block for nanofabrication. In nanochannels the solid-liquid interface plays a non-negligible role in determining the fluid dynamics. Therefore, for an optimal design of nanofluidic devices, a comprehensive understanding of the slippage in a water flow confined between graphene walls is important. In nanoconfinement, experimental and computational studies have found the slip length to increase nonlinearly when the shear rate is larger than a critical value...
February 14, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28186790/giant-acceleration-of-dna-diffusion-in-an-array-of-entropic-barriers
#19
Daniel Kim, Clark Bowman, Jackson T Del Bonis-O'Donnell, Anastasios Matzavinos, Derek Stein
We investigate with experiments and computer simulations the nonequilibrium dynamics of DNA polymers crossing arrays of entropic barriers in nanofluidic devices in a pressure-driven flow. With increasing driving pressure, the effective diffusivity of DNA rises and then peaks at a value that is many times higher than the equilibrium diffusivity. This is an entropic manifestation of "giant acceleration of diffusion." The phenomenon is sensitive to the effective energy landscape; thus, it offers a unique probe of entropic barriers in a system driven away from equilibrium...
January 27, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28161594/mixed-convection-peristaltic-flow-of-eyring-powell-nanofluid-in-a-curved-channel-with-compliant-walls
#20
Anum Tanveer, T Hayat, Fuad Alsaadi, A Alsaedi
The novel features of nanofluids made them potentially significant in heat transfer mechanism occurring in medical and industrial processes like microelectronics, pharmaceutical processes, hybrid engines, thermal management of vehicles, refrigerator, chiller, gas temperature reduction and so forth. These processes bear tendency to enhance thermal conductivity and the convective heat transfer more efficiently than base fluid. This unique aspect made nanofluids the topic of interest in recent time via different fluid flow models...
March 1, 2017: Computers in Biology and Medicine
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