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Nanofluid

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https://www.readbyqxmd.com/read/28231298/a-revised-model-for-jeffrey-nanofluid-subject-to-convective-condition-and-heat-generation-absorption
#1
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
#2
Rakesh Rajegowda, Sridhar 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...
February 23, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28229955/three-dimensional-colloidal-lithography
#3
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...
February 23, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28226213/an-oscillatory-reaction-induced-periodic-c-quadruplex-dna-gating-of-artificial-ion-channels
#4
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 of 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)64-, H+, and SO32-, into a synthetic proton-sensitive nanochannel modified with C-quadruplex (C4) DNA motors...
February 22, 2017: ACS Nano
https://www.readbyqxmd.com/read/28209025/cmos-compatible-fabrication-for-photonic-crystal-based-nanofluidic-structure
#5
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
#6
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
#7
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
#8
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
#9
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
#10
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...
January 27, 2017: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/28151968/numerical-simulation-for-peristalsis-of-carreau-yasuda-nanofluid-in-curved-channel-with-mixed-convection-and-porous-space
#11
Anum Tanveer, T Hayat, A Alsaedi, B Ahmad
Main theme of present investigation is to model and analyze the peristaltic activity of Carraeu-Yasuda nanofluid saturating porous space in a curved channel. Unlike the traditional approach, the porous medium effects are characterized by employing modified Darcy's law for Carreau-Yasuda fluid. To our knowledge this is first attempt in this direction for Carreau-Yasuda fluid. Heat and mass transfer are further considered. Simultaneous effects of heat and mass transfer are examined in presence of mixed convection, viscous dissipation and thermal radiation...
2017: PloS One
https://www.readbyqxmd.com/read/28129356/radiative-flow-of-powell-eyring-magneto-nanofluid-over-a-stretching-cylinder-with-chemical-reaction-and-double-stratification-near-a-stagnation-point
#12
Muhammad Ramzan, Muhammad Bilal, Jae Dong Chung
This exploration addresses MHD stagnation point Powell Eyring nanofluid flow with double stratification. The effects of thermal radiation and chemical reaction are added in temperature and nanoparticle concentration fields respectively. Furthermore, appropriate transformations are betrothed to obtain nonlinear differential equations from the system of partial differential equations and an analytical solution of system of coupled differential equations is obtained by means of the renowned Homotopy Analysis method...
2017: PloS One
https://www.readbyqxmd.com/read/28128381/a-nano-flow-cytometer-for-single-lipid-vesicle-analysis
#13
Remo Friedrich, Stephan Block, Mohammadreza Alizadehheidari, Susanne Heider, Joachim Fritzsche, Elin K Esbjörner, Fredrik Westerlund, Marta Bally
We present a nanofluidic device for fluorescence-based detection and characterization of small lipid vesicles on a single particle basis. The device works like a nano flow cytometer where individual vesicles are visualized by fluorescence microscopy while passing through parallel nanochannels in a pressure-driven flow. An experiment requires less than 20 μl sample volume to quantify both the vesicle content and the fluorescence signals emitted by individual vesicles. We show that the device can be used to accurately count the number of fluorescent synthetic lipid vesicles down to a vesicle concentration of 170 fM...
January 27, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28126327/serotype-specific-effectiveness-of-23-valent-pneumococcal-polysaccharide-vaccine-against-pneumococcal-pneumonia-in-adults-aged-65-years-or-older-a-multicentre-prospective-test-negative-design-study
#14
Motoi Suzuki, Bhim Gopal Dhoubhadel, Tomoko Ishifuji, Michio Yasunami, Makito Yaegashi, Norichika Asoh, Masayuki Ishida, Sugihiro Hamaguchi, Masahiro Aoshima, Koya Ariyoshi, Konosuke Morimoto
BACKGROUND: The serotype-specific effectiveness of 23-valent pneumococcal polysaccharide vaccine (PPV23) against pneumococcal pneumonia has not been established in people aged 65 years or older. We assessed the effectiveness of PPV23 in this population. METHODS: For this multicentre, prospective study, we enrolled all individuals aged 65 years or older with community-onset pneumonia who visited four study hospitals in Japan between Sept 28, 2011, and Aug 23, 2014...
January 23, 2017: Lancet Infectious Diseases
https://www.readbyqxmd.com/read/28112157/wafer-scale-integration-of-sacrificial-nanofluidic-chips-for-detecting-and-manipulating-single-dna-molecules
#15
Chao Wang, Sung-Wook Nam, John M Cotte, Christopher V Jahnes, Evan G Colgan, Robert L Bruce, Markus Brink, Michael F Lofaro, Jyotica V Patel, Lynne M Gignac, Eric A Joseph, Satyavolu Papa Rao, Gustavo Stolovitzky, Stanislav Polonsky, Qinghuang Lin
Wafer-scale fabrication of complex nanofluidic systems with integrated electronics is essential to realizing ubiquitous, compact, reliable, high-sensitivity and low-cost biomolecular sensors. Here we report a scalable fabrication strategy capable of producing nanofluidic chips with complex designs and down to single-digit nanometre dimensions over 200 mm wafer scale. Compatible with semiconductor industry standard complementary metal-oxide semiconductor logic circuit fabrication processes, this strategy extracts a patterned sacrificial silicon layer through hundreds of millions of nanoscale vent holes on each chip by gas-phase Xenon difluoride etching...
January 23, 2017: Nature Communications
https://www.readbyqxmd.com/read/28106004/wetting-behavior-of-multi-walled-carbon-nanotube-nanofluids
#16
A Karthikeyan, S Coulombe, A M Kietzig
Nanofluids-engineered colloidal suspensions in base liquids-have captivated the interest of researchers over the last two decades for various existing as well as emerging technological applications. The main impetus for the synthesis of such novel nanocomposite liquids is the potential to alter properties of the base liquid, such as its viscosity, thermal conductivity, and surface tension, and to introduce specific optical and magnetic properties. Numerous studies suggest trends and explanations for the effects associated with the addition of nanoparticles, and that deviation from the base liquid properties are dependent on nanoparticle concentration...
March 10, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28102524/heat-transfer-capability-of-ethylene-glycol-water-based-nanofluids-containing-graphene-nanoplatelets-design-and-thermophysical-profile
#17
D Cabaleiro, L Colla, S Barison, L Lugo, L Fedele, S Bobbo
This research aims at studying the stability and thermophysical properties of nanofluids designed as dispersions of sulfonic acid-functionalized graphene nanoplatelets in an (ethylene glycol + water) mixture at (10:90)% mass ratio. Nanofluid preparation conditions were defined through a stability analysis based on zeta potential and dynamic light scattering (DLS) measurements. Thermal conductivity, dynamic viscosity, and density were experimentally measured in the temperature range from 283.15 to 343.15 K and nanoparticle mass concentrations of up to 0...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28098301/optical-dna-mapping-in-nanofluidic-devices-principles-and-applications
#18
Vilhelm Müller, Fredrik Westerlund
Optical DNA mapping has over the last decade emerged as a very powerful tool for obtaining long range sequence information from single DNA molecules. In optical DNA mapping, intact large single DNA molecules are labeled, stretched out, and imaged using a fluorescence microscope. This means that sequence information ranging over hundreds of kilobasepairs (kbp) can be obtained in one single image. Nanochannels offer homogeneous and efficient stretching of DNA that is crucial to maximize the information that can be obtained from optical DNA maps...
January 18, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28081001/how-assembly-matters-to-catalysis-and-thermal-conductivity-mediated-by-cuo-nanoparticles
#19
Ahmed Mohsen Ismail, Mahmoud Mohamed Emara, Taher Salah El Din Kassem, Mahmoud Ahmed Moussa
CuO nanostructures (NSs) of different morphologies were prepared, applied as catalysts for the pyrolysis of sugarcane bagasse (PSCB), and applied for thermally-conductive nanofluids. Both size and shape of the prepared NSs ranged from 5 to 1000 nm, and from nanodots (NDs) to spindle nano-aggregates (NAs), respectively. The catalytic activity of these NSs towards the PSCB was followed up by thermogravimetric analysis (TGA), where they increased the percentage of total weight loss, and lowered the decomposition temperatures of PSCB...
January 12, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28079124/axisymmetric-rotational-stagnation-point-flow-impinging-radially-a-permeable-stretching-shrinking-surface-in-a-nanofluid-using-tiwari-and-das-model
#20
Natalia C Roşca, Ioan Pop
In this paper, the problem of normal impingement rotational stagnation-point flow on a radially permeable stretching sheet in a viscous fluid, recently studied in a very interesting paper, is extended to a water-based nanofluid. A similarity transformation is used to reduce the system of governing nonlinear partial differential equations to a system of ordinary differential equations, which is then solved numerically using the function bvp4c from Matlab. It is found that dual (upper and lower branch) solutions exist for some values of the governing parameters...
January 12, 2017: Scientific Reports
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