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Seon-Yeong Kwak, Juan Pablo Giraldo, Min Hao Wong, Volodymyr Koman, Tedrick Lew, Jon Ell, Mark Weidman, Rosalie Sinclair, Markita P Landry, William A Tisdale, Michael S Strano
The engineering of living plants for visible light emission and sustainable illumination is compelling because plants possess independent energy generation and storage mechanisms and autonomous self-repair. Herein, we demonstrate a plant nanobionic approach that enables exceptional luminosity and lifetime utilizing four chemically-interacting nanoparticles, including firefly luciferase conjugated silica (SNP-Luc), D-luciferin releasing poly(lactic-co-glycolic acid) (PLGA-LH2), coenzyme A functionalized chitosan (CS-CoA) and semiconductor nanocrystal phosphors for longer wavelength modulation...
November 17, 2017: Nano Letters
J L Lou, L Guo, W H Zheng, J Z Zhao, J Q Zhao, Z Liang, S Y Wang, M Y Fang
Objective: To investigate the value of detecting circulating tumor cells (CTCs) in patients with local advanced head and neck squamous cell carcinoma (LAHNSCC). Methods: Twenty cases of LAHNSCC and eight healthy cases as the negative control were collected. The clinicopathological factors were evaluated. The LAHNSCC CTCs were enriched by specific antibody nanofluidic chip immunoassay using CytoSorter CTCs sorting system. LAHNSCC CTCs were identified by immunofluorescence staining. The relationships between CTCs and the clinicopathological features of LAHNSCC were analyzed...
November 7, 2017: Zhonghua Er Bi Yan Hou Tou Jing Wai Ke za Zhi, Chinese Journal of Otorhinolaryngology Head and Neck Surgery
Sylwia Wciślik
In this paper, a review of the impact of most common nanoparticles on the Leidenfrost temperature TLeid in heat transfer applications is delivered. Moreover, a simple economic analysis of the nanoparticles use is proposed. When coolant is distilled water, TLeid can range 150-220 °C; occasionally, it can even amount to over 400 °C. When the base liquid is modified by additives, considerable changes in the character of heat transfer are observed. Out of five nanofluids under consideration in this study, the best thermal effect (up to 50%) is obtained when Al2O3 nanofluid having particle sizes ~39 nm and volume concentration of 0...
2017: Chemické Zvesti
Angkur Jyoti Dipanka Shaikeea, Saptarshi Basu, Lalit Bansal
Interactive droplet systems form the backbone for emerging avenues in droplet based technologies like cell sorting, inkjet printing and digital microfluidics, to name a few. These and their associated fields have gained significant importance in the recent times. Here, we report one such phenomenon wherein a naturally evaporating nanocolloidal sessile droplet interacts with a porous silica gel bead to mimic a macro scale mechanical crane assembly. Precisely, we show a sequence of events displayed by the particle laden aqueous droplet (nanoparticles of silica at different loading rates placed on a hydrophobic substrate) when brought in contact with a meso-porous silica gel bead...
October 25, 2017: Journal of Colloid and Interface Science
Wen Fan, Jige Chen, Xiaoling Lei, Haiping Fang
Ionic hydration shells are the most noticeable microscopic feature in an aqueous salt solution, and have attracted attention due to their possible contribution to its flow behavior. In this paper, we find by molecular dynamic simulations that an S-shaped velocity profile is induced by the ionic hydration shells in the nano channel flow. Our theoretical analysis implies a linear relationship between the energy density inside the first hydration shell of the ions and the deformation strength of the velocity profiles of aqueous salt solutions, where the deformation strength is quantified by the curvature length defined by the linear deviation extended from the velocity profile...
November 2, 2017: Physical Chemistry Chemical Physics: PCCP
Yan Xu
A significant growth of research in nanofluidics is achieved over the past decade, but the field is still facing considerable challenges toward the transition from the current physics-centered stage to the next application-oriented stage. Many of these challenges are associated with materials science, so the field of nanofluidics offers great opportunities for materials scientists to exploit. In addition, the use of unusual effects and ultrasmall confined spaces of well-defined nanofluidic environments would offer new mechanisms and technologies to manipulate nanoscale objects as well as to synthesize novel nanomaterials in the liquid phase...
November 2, 2017: Advanced Materials
Haruka Kyakuno, Kazuyuki Matsuda, Yusuke Nakai, Ryota Ichimura, Takeshi Saito, Yasumitsu Miyata, Kenji Hata, Yutaka Maniwa
Water in a nanoconfined geometry has attracted great interest from the viewpoint of not only basic science but also nanofluidic applications. Here, the rotational dynamics of water inside single-walled carbon nanotubes (SWCNTs) with mean diameters larger than ca. 1.4 nm were investigated systematically using (2)H nuclear magnetic resonance spectroscopy with high-purity SWCNTs and molecular dynamics calculations. The results were compared with those for hydrophilic pores. It was found that faster water dynamics could be achieved by increasing the hydrophobicity of the pore walls and decreasing the pore diameters...
November 1, 2017: Scientific Reports
Shahrzad Shahrabi Farahani, Khosro Madanipour, Ata Koohian
Interaction of a CW laser with a nonlinear medium leads to some thermal phenomena. Thermal lensing, which changes the distribution of the refractive index of the medium in the interacting area, is the most important phenomenon among them. Moiré deflectometry is a known technique for measuring the profile of refractive index. In this work, by using nonscanning moiré deflectometry, the refractive index profile in the interaction region of a graphene oxide nanofluid sample and a green CW laser is measured. Using the thermal diffusion equation, the thermo-optical coefficient is calculated...
November 1, 2017: Applied Optics
F Purr, M Bassu, R D Lowe, B Thürmann, A Dietzel, T P Burg
Measuring small changes in refractive index can provide both sensitive and contactless information on molecule concentration or process conditions for a wide range of applications. However, refractive index measurements are easily perturbed by non-specific background signals, such as temperature changes or non-specific binding. Here, we present an optofluidic device for measuring refractive index with direct background subtraction within a single measurement. The device is comprised of two interdigitated arrays of nanofluidic channels designed to form an optical grating...
November 1, 2017: Lab on a Chip
Kai Zhao, Dongqing Li
HYPOTHESIS: Emulsion droplets are versatile tools in chemical and biological fields and the separation of emulsion droplets is one of the most crucial steps in research and industry. EXPERIMENTS: This work developed a nano-orifice based DC dielectrophoretic (DEP) system for the sorting of oil-in-water emulsion droplets by size and content in a microchannel. Then, the size-dependent separation of oil droplets was conducted and verified by the prediction of theoretical simulation...
October 20, 2017: Journal of Colloid and Interface Science
A Esfandiar, B Radha, F C Wang, Q Yang, S Hu, S Garaj, R R Nair, A K Geim, K Gopinadhan
In the field of nanofluidics, it has been an ultimate but seemingly distant goal to controllably fabricate capillaries with dimensions approaching the size of small ions and water molecules. We report ion transport through ultimately narrow slits that are fabricated by effectively removing a single atomic plane from a bulk crystal. The atomically flat angstrom-scale slits exhibit little surface charge, allowing elucidation of the role of steric effects. We find that ions with hydrated diameters larger than the slit size can still permeate through, albeit with reduced mobility...
October 27, 2017: Science
Jung-Tak Jang, Jin Wook Jeoung, Joo Hyun Park, Won June Lee, Yu Jeong Kim, Jiyun Seon, Minkyu Kim, Jooyoung Lee, Sun Ha Paek, Ki Ho Park, Seongtae Bae
In this study, we investigated the effects of recovery time during magnetic nanofluid hyperthermia (MNFH) on the cell death rate and the heat shock proteins 72 (HSP72) induction behavior in retinal ganglion cells (RGCs-5) to provide a possible solution for highly efficient ocular neuroprotection. The recovery time and the heat duration time during MNFH were systematically controlled by changing the duty cycle of alternating current (AC) magnetic field during MNFH. It was clearly observed that the cell death rate and the HSP72 induction rate had a strong dependence on the recovery time and the optimizated recovery time resulted in maximizing the induction efficiency of HSP72...
October 24, 2017: Scientific Reports
Li-Hsien Yeh, Fu Chen, Yu-Ting Chiou, Yen-Shao Su
Previous studies on nanofluidic salinity gradient power (NSGP), where energy associated with the salinity gradient can be harvested with ion-selective nanopores, all suggest that nanofluidic devices having higher surface charge density should have higher performance, including osmotic power and conversion efficiency. In this manuscript, this viewpoint is challenged and anomalous counterintuitive pH-dependent NSGP behaviors are reported. For example, with equal pH deviation from its isoelectric point (IEP), the nanopore at pH < IEP is shown to have smaller surface charge density but remarkably higher NSGP performance than that at pH > IEP...
October 24, 2017: Small
Chunshuang Yan, Chade Lv, Yue Zhu, Gang Chen, Jingxue Sun, Guihua Yu
Rational surface engineering of 2D nanoarchitectures-based electrode materials is crucial as it may enable fast ion transport, abundant-surface-controlled energy storage, long-term structural integrity, and high-rate cycling performance. Here we developed the stacked ultrathin Co3 O4 nanosheets with surface functionalization (SUCNs-SF) converted from layered hydroxides with inheritance of included anion groups (OH(-) , NO3(-) , CO3(2-) ). Such stacked structure establishes 2D nanofluidic channels offering extra lithium storage sites, accelerated Li-ion transport, and sufficient buffering space for volume change during electrochemical processes...
October 17, 2017: Advanced Materials
Xuanbo Zhu, Yahong Zhou, Junran Hao, Bin Bao, Xiujie Bian, Xiangyu Jiang, Jinhui Pang, Haibo Zhang, Zhenhua Jiang, Lei Jiang
The design and fabrication of a robust nanoporous membrane in large scale is still a challenge and is of fundamental importance for practical applications. Here, a robust three/two-dimensional polymer/graphene oxide heterogeneous nanoporous membrane is constructed in large scale via the self-assembly approach by chemically designing a robust charge-density-tunable nanoporous ionomer with uniform pore size. To obtain a nanoporous polymer that maintains high mechanical strength and promotes multifunctionality, we designed a series of amphiphilic copolymers by introducing a positively charged pyridine moiety into the engineered polymer polyphenylsulfone...
October 23, 2017: ACS Nano
M Arshadi Pirlar, S M S Movahed, D Razzaghi, R Karimzadeh
In this paper, we investigate the crossing statistics of speckle patterns formed in the Fresnel diffraction region by a laser beam scattering through a nanofluid. We extend zero-crossing statistics to assess the dynamical properties of the nanofluid. According to the joint probability density function of laser beam fluctuation and its time derivative, the theoretical frameworks for Gaussian and non-Gaussian regimes are revisited. We count the number of crossings not only at zero level but also for all available thresholds to determine the average speed of moving particles...
September 1, 2017: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
Anne M Benneker, Hans David Wendt, Rob G H Lammertink, Jeffery A Wood
Charge selective asymmetric nanochannels are used for a variety of applications, such as nanofluidic sensing devices and energy conversion applications. In this paper, we numerically investigate the influence of an applied temperature difference over tapered nanochannels on the resulting charge transport and flow behavior. Using a temperature-dependent formulation of the coupled Poisson-Nernst-Planck and Navier-Stokes equations, various nanochannel geometries are investigated. Temperature has a large influence on the total ion transport, as the diffusivity of ions and viscosity of the solution are strongly affected by temperature...
October 25, 2017: Physical Chemistry Chemical Physics: PCCP
Gonzalo Pérez-Mitta, Waldemar A Marmisollé, Alberto G Albesa, María Eugenia Toimil-Molares, Christina Trautmann, Omar Azzaroni
There is currently high interest in developing nanofluidic devices whose iontronic output is defined by biological interactions. The fabrication of a phosphate responsive nanofluidic diode by using the biological relevant amine-phosphate interactions is shown. The fabrication procedure includes the modification of a track-etched asymmetric (conical) nanochannel with polyallylamine (PAH) by electrostatic self-assembly. PAH is the arcaetypical model of polyamine and it is further used to address the nanochannels with phosphate responsivity...
October 12, 2017: Small
Ali Reza Zarei, Maryam Nedaei, Sohrab Ali Ghorbanian
A deep eutectic solvent based magnetic nanofluid was coupled with stir bar sorptive dispersive microextraction as a hyphenated sample preparation technique. The neodymium core magnetic stir bar was coated physically with nanofluid of magnetic carbon nanotube nanocomposites and deep eutectic solvents. The prepared nanofluid has magnetic and strong sorbing properties and is compatible with gas chromatography. In this nanofluid, the deep eutectic solvent acts simultaneously as both carrier and stabilizer for magnetic nanotubes...
October 12, 2017: Journal of Separation Science
Wonseok Kim, Sungmin Park, Kihong Kim, Sung Jae Kim
While the ion concentration polarization (ICP) phenomenon has been intensively researched for the last decade, a complete picture of ion and analyte distributions near nanoporous membranes is strongly desired, not only for fundamental nano-electrokinetic studies but also for the development of lab-on-a-chip applications. Since direct concentration measurements, using either time-consuming collection or microelectrodes, are limited due to low throughput (<nL min(-1) in typical micro/nanofluidic device) and Faradaic reactions, respectively, we measured the concentration changes of prefilled solutions in individual reservoirs in this work...
November 7, 2017: Lab on a Chip
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