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Jiaye Su, Yunzhen Zhao, Chang Fang
Graphene is a versatile 2D material and attracts increasing attentions from a broad scientific community, including novel nanofluidic devices. In this work, we use molecular dynamics simulations to study the pressure driven water transport through graphene layers, focusing on the pore size homogeneity, realized by the arrangement of two pore sizes. For a given layer number, we find the water flux exhibits an excellent linear behavior with the pressure, in agreement with the prediction of Hagen-Poiseuille equation...
March 16, 2018: Nanotechnology
Zafar Said, Anis Allagui, Mohammad Ali Abdelkareem, Hussain Alawadhi, Khaled Elsaid
Carbon-based nanofluids are viewed as promising thermal fluids for heat transfer applications. However, other properties, such as electrical conductivity and electrochemical behavior, are usually overlooked and rarely investigated despite their importance for the overall performance characterization of a given application. In this study, we synthesized PAN-based carbon nanofibers (CNF) by electrospinning, and characterized them using electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, Raman spectroscopy, and thermogravimetric analysis...
March 3, 2018: Journal of Colloid and Interface Science
Ran Peng, Xiaowu Shirley Tang, Dongqing Li
This paper presents a new method of sensing single molecules and cations by a carbon nanotube (CNT)-based differential resistive pulse sensing (RPS) technique on a nanofluidic chip. A mathematical model for multichannel RPS systems is developed to evaluate the CNT-based RPS signals. Individual cations, rhodamine B dye molecules, and ssDNAs are detected successfully with high resolution and high signal-to-noise ratio. Differentiating ssDNAs with 15 and 30 nucleotides are achieved. The experimental results also show that translocation of negatively charged ssDNAs through a CNT decreases the electrical resistance of the CNT channel, while translocation of positively charged cations and rhodamine B molecules increases the electrical resistance of the CNT...
March 5, 2018: Small
Jonathan R Burns, Stefan Howorka
DNA nanopores are a recent class of bilayer-puncturing nanodevices that can help advance biosensing, synthetic biology, and nanofluidics. Here, we create archetypal lipid-anchored DNA nanopores and characterize them with a nanoprobe-based approach to gain essential information about their interactions with bilayers. The strategy determines the molecular accessibility of DNA pores with a nuclease and can thus distinguish between the nanopores' membrane-adhering and membrane-spanning states. The analysis reveals, for example, that pores interact with bilayers in two steps whereby fast initial membrane tethering is followed by slower reorientation to the puncturing state...
March 1, 2018: ACS Nano
Muhammad Adil, Keanchuan Lee, Hasnah Mohd Zaid, Noor Rasyada Ahmad Latiff, Mohamad Sahban Alnarabiji
Recently, nano-EOR has emerged as a new frontier for improved and enhanced oil recovery (IOR & EOR). Despite their benefits, the nanoparticles tend to agglomerate at reservoir conditions which cause their detachment from the oil/water interface, and are consequently retained rather than transported through a porous medium. Dielectric nanoparticles including ZnO have been proposed to be a good replacement for EOR due to their high melting point and thermal properties. But more importantly, these particles can be polarized under electromagnetic (EM) irradiation, which provides an innovative smart Nano-EOR process denoted as EM-Assisted Nano-EOR...
2018: PloS One
Dianchen Lu, M Ramzan, Noor Ul Huda, Jae Dong Chung, Umer Farooq
A mathematical model is envisaged to study the axisymmetric steady magnetohydrodynamic (MHD) Carreau nanofluid flow under the influence of nonlinear thermal radiation and chemical reaction past a radially stretched surface. Impact of heat generation/absorption with newly introduced zero mass flux condition of nanoparticles at the sheet is an added feature towards novelty of the problem. Further, for nanofluid the most recently organized model namely Buongiorno's model is assumed that comprises the effects thermophoresis and Brownian motion...
February 27, 2018: Scientific Reports
Shuli Wang, Yongshun Liu, Peng Ge, Qiqi Kan, Nianzuo Yu, Jing Wang, Jingjie Nan, Shunsheng Ye, Junhu Zhang, Weiqing Xu, Bai Yang
This article shows a new strategy for the fabrication of nanofluidics based on nanoscale gaps in nanopillar arrays. Silicon nanopillar arrays are prepared in a designed position by combining conventional photolithography with colloidal lithography. The nanogaps between the pillars are used as nanochannels for the connection of two polydimethylsiloxane-based microchannels in microfluidics. The gap between neighbouring nanopillars can be accurately controlled by changing the size of initial colloidal spheres and by an etching process, which further determines the dimensions of the nanochannels...
February 27, 2018: Lab on a Chip
C López-Bueno, D Bugallo, V Leborán, F Rivadulla
We present the analysis of the thermal conductivity, κ, and heat capacity, Cp , of a wide variety of liquids, covering organic molecular solvents, ionic liquids and water-polymer mixtures. These data were obtained from ≈0.6 μL samples, using an experimental development based on the 3ω method, capable of the simultaneous measurement of κ and Cp . In spite of the different type and strength of interactions, expected in a priori so different systems, the ratio of κ to the sound velocity is approximately constant for all of them...
February 27, 2018: Physical Chemistry Chemical Physics: PCCP
Yasuyo Urasaki, Chi Zhang, Ji-Xin Cheng, Thuc T Le
Current assessment of non-alcoholic fatty liver disease (NAFLD) with histology is time-consuming, insensitive to early-stage detection, qualitative, and lacks information on etiology. This study explored alternative methods for fast and quantitative assessment of NAFLD with hyperspectral stimulated Raman scattering (SRS) microscopy and nanofluidic proteomics. Hyperspectral SRS microscopy quantitatively measured liver composition of protein, DNA, and lipid without labeling and sensitively detected early-stage steatosis in a few minutes...
February 26, 2018: Scientific Reports
Yifei Wang, Md Azahar Ali, Edmond K C Chow, Liang Dong, Meng Lu
The rapid growth of point-of-care tests demands for biosensors with high sensitivity and small size. This paper demonstrates an optofluidic metasurface that combines silicon-on-insulator (SOI) nanophotonics and nanofluidics to realize a high-performance, lateral flow-through biosensor. The metasurface is made of a periodic array of silicon nanoposts on an SOI substrate, and functionalized with specific receptor molecules. Bonding of a polydimethylsiloxane slab directly onto the surface results in an ultracompact biosensor, where analyte solutions are restricted to flow only in the space between the nanoposts...
February 17, 2018: Biosensors & Bioelectronics
Nguyen Van Toan, Naoki Inomata, Masaya Toda, Takahito Ono
In this work, we report a simple and low-cost way to create nanopores that can be employed for various applications in nanofluidics. Nano sized Ag particles in the range from 1 nm to 20 nm are formed on a silicon substrate with a de-wetting method. Then the silicon nanopores with an approximate 15 nm-average diameter and 200 µm-height are successfully produced by the metal-assisted chemical etching method. In addition, electrically driven ion transport in the nanopores is demonstrated for nanofluidic applications...
February 23, 2018: Nanotechnology
Deepak P Dubal, Daniel Rueda-Garcia, Carlos Marchante, Raul Benages, Pedro Gomez-Romero
Solid Hybrid materials abound. But flowing versions of them are new actors in the materials science landscape and in particular for energy applications. This paper presents a new way to deliver nanostructured hybrid materials for energy storage, namely, in the form of nanofluids. We present here the first example of a hybrid electroactive nanofluid (HENFs) combining capacitive and faradaic energy storage mechanisms in a single fluid material. This liquid electrode is composed of reduced graphene oxide and polyoxometalates (rGO-POMs) forming a stable nanocomposite for electrochemical energy storage in novel Nanofluid Flow Cells...
February 22, 2018: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
Yu-Chin Chien, Huei Chu Weng
In magnetowetting, the material properties of liquid, surface morphology of solid, and applied external field are three major factors used to determine the wettability of a liquid droplet on a surface. For wetting measurements, an irregular or uneven surface could result in a significant experimental uncertainty. The periodic array with a hexagonal symmetry structure is an advantage of the anodic aluminum oxide (AAO) structure. This study presents the results of the wetting properties of magnetic nanofluid sessile droplets on surfaces of various AAO pore sizes under an applied external magnetic field...
February 20, 2018: Nanomaterials
Durgarao Guttula, Fan Liu, Jeroen A van Kan, Véronique Arluison, Johan R C van der Maarel
The effect of the heat unstable nucleoid structuring protein HU on the conformation of single DNA molecules confined in a nanochannel was investigated with fluorescence microscopy. Pre-incubated DNA molecules contract in the longitudinal direction of the channel with increasing concentration of HU. This contraction is mainly due to HU-mediated bridging of distal DNA segments and is controlled by channel diameter as well as ionic composition and strength of the buffer. For over-threshold concentrations of HU, the DNA molecules compact into an condensed form...
February 19, 2018: Soft Matter
Anastasia Spyrogianni, Katerina S Karadima, Eirini Goudeli, Vlasis G Mavrantzas, Sotiris E Pratsinis
Agglomerate settling impacts nanotoxicology and nanomedicine as well as the stability of engineered nanofluids. Here, the mobility of nanostructured fractal-like SiO 2 agglomerates in water is investigated and their settling rate in infinitely dilute suspensions is calculated by a Brownian dynamics algorithm tracking the agglomerate translational and rotational motion. The corresponding friction matrices are obtained using the HYDRO++ algorithm [J. G. de la Torre, G. del Rio Echenique, and A. Ortega, J. Phys...
February 14, 2018: Journal of Chemical Physics
A K M Mahmudul Haque, Sedong Kim, Junhyo Kim, Jungpil Noh, Sunchul Huh, Byeongkeun Choi, Hanshik Chung, Hyomin Jeong
This study presents the forced convective heat transfer of a nanofluid consisting of distilled water and different weight concentrations (1 wt% and 2 wt%) of Al2O3 nanoparticles flowing in a vertical shell and tube heat exchanger under counter flow and laminar flow regime with certain constant heat flaxes (at 20 °C, 30 °C, 40 °C and 50 °C). The Al2O3 nanoparticles of about 50 nm diameter are used in the present study. Stability of aqueous Al2O3 nanofluids, TEM, thermal conductivity, temperature differences, heat transfer rate, T-Q diagrams, LMTD and convective heat transfer coefficient are investigated experimentally...
March 1, 2018: Journal of Nanoscience and Nanotechnology
Casey J Galvin, Kentaro Shirai, Ali Rahmani, Kakuta Masaya, Amy Q Shen
Understanding nanoconfinement phenomena is necessary to develop nanofluidic technology platforms. One example of nanoconfinement phenomena are shifts in reaction equilibria toward reaction products in nanoconfined systems, which have been predicted theoretically and observed experimentally in DNA hybridization. Here we demonstrate a convection limited nanofluidic immunoassay that achieves total capture of a target analyte, and an apparent shift in the antibody-antigen reaction equilibrium due to nanoconfinement...
February 15, 2018: Analytical Chemistry
Piergiorgio Stevanato, Chiara Broccanello, Vita M C Moliterni, Giuseppe Mandolino, Valeria Barone, Luigi Lucini, Giovanni Bertoldo, Marco Bertaggia, Massimo Cagnin, Diego Pizzeghello, Andrea Baglieri, Andrea Squartini, Giuseppe Concheri, Serenella Nardi
In this study, a system based on omics profiling was set-up for sugar beet ( Beta vulgaris L. subsp. vulgaris ) evaluation after changes in sulfate availability. Seedlings were grown on sulfate-deprived Hoagland solution. Six days after germination, 100 μM MgSO 4 was added to the solution. Root samples were collected 36 h after treatments. WinRHIZO root-scanning approach was used for the automated image analysis of plant root morphology. Inductively Coupled Plasma Spectrometry (ICP-OES) and quadrupole-time-of-flight mass spectrometry (Q-TOF) were used for ionomic and metabolic analysis, respectively...
2018: Frontiers in Plant Science
Satoshi Kakiuchi, Motoi Suzuki, Bhim Gopal Dhoubhadel, Akitsugu Furumoto, Hiroyuki Ito, Kei Matsuki, Yoshiko Tsuchihashi, Norichika Asoh, Michio Yasunami, Koya Ariyoshi, Konosuke Morimoto
The lack of reliable diagnostic tests for detecting vaccine serotype pneumococcal pneumonia (VTPP) remains a challenging issue in pneumococcal vaccine studies. This study assessed the performances of high-throughput nanofluidic PCR-based pneumococcal serotyping and quantification assay methods using sputum samples (nanofluidic Sp-qPCR) to diagnose the 13-valent pneumococcal conjugate VTPP compared with that of the serotype-specific urinary antigen detection (UAD) assay using urine samples. Adult pneumonia patients from Japan were enrolled in this study between September 2012 and August 2014...
February 14, 2018: Journal of Clinical Microbiology
G A Basheed, Komal Jain, Saurabh Pathak, R P Pant
We investigate the effect of dilution on dipolar interaction with linear and non-linear rheological properties of kerosene based magnetic fluid. The steady-state behavior demonstrate a shear thinning behavior and corroborated with a power law, (η = c <mml:math display="block"> <mml:mover accent="true"> <mml:mi>γ</mml:mi> <mml:mo>˙</mml:mo> </mml:mover></mml:math>n + η∞) exponent, n ≤ 1. The shear-induced-breakup (separation) of nanoparticles and the yielding behavior has been explained by Bingham model...
April 1, 2018: Journal of Nanoscience and Nanotechnology
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