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PubMed Journals Articles About "Phase Imaging Nanoscale Energy Dissipation Supported Graphene Using" RSS

10:30 EST 17th December 2018 | BioPortfolio

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Showing "Phase imaging nanoscale energy dissipation supported graphene using" PubMed Articles 1–25 of 22,000+

Dynamic strain in gold nanoparticle supported graphene induced by focused laser irradiation.

Graphene on noble-metal nanostructures constitutes an attractive nanocomposite with possible applications in sensors or energy conversion. In this work we study the properties of hybrid graphene/gold nanoparticle structures by Raman spectroscopy and scanning probe methods. The nanoparticles (NPs) were prepared by local annealing of gold thin films using a focused laser beam. The method resulted in a patterned surface, with NPs formed at arbitrarily chosen microscale areas. Graphene grown by chemical vapour ...


In situ synthesis of MnO on Ni foam/graphene substrate as a newly self-supported electrode for high supercapacitive performance.

A newly self-supported electrode composed of MnO on Ni foam/graphene (NF/graphene/MnO) was synthesized in situ by electrodeposition, and was used as a supercapacitor electrode for the first time. An ultrahigh specific capacitance of 630 Fg can be achieved at a current density of 0.5 Ag. The maximum energy density of 94.4 Wh kg can be achieved, and the capacitance retention can be maintained about 97% after 20,000 cycles at 10 Ag. The electrochemical properties, including specific capacitance, ener...

Tuning Anti-Klein to Klein Tunneling in Bilayer Graphene.

We show that in gapped bilayer graphene, quasiparticle tunneling and the corresponding Berry phase can be controlled such that they exhibit features of single-layer graphene such as Klein tunneling. The Berry phase is detected by a high-quality Fabry-Pérot interferometer based on bilayer graphene. By raising the Fermi energy of the charge carriers, we find that the Berry phase can be continuously tuned from 2π down to 0.68π in gapped bilayer graphene, in contrast to the constant Berry phase of 2π in pri...


Dynamic behavior of nanoscale liquids in graphene liquid cells revealed by in situ transmission electron microscopy.

Recent advances in graphene liquid cells for in situ transmission electron microscopy (TEM) have opened many opportunities for the study of materials transformations and chemical reactions in liquids with high spatial resolution. However, the behavior of thin liquids encapsulated in a graphene liquid cell has not been fully understood. Here, we report real time TEM imaging of the nanoscale dynamic behavior of liquids in graphene nanocapillaries. Our observations reveal that the interfaces between liquid and...

Diffusion controlled multilayer electrocatalysts via graphene oxide nanosheets of varying sizes.

Controlling the architecture of hybrid nanomaterial electrodes is critical for understanding their fundamental electrochemical mechanisms and applying these materials in future energy conversion and storage systems. Herein, we report highly tunable electrocatalytic multilayer electrodes, composed of palladium nanoparticles (Pd NPs) supported by graphene sheets of varying lateral sizes, employing a versatile layer-by-layer (LbL) assembly method. We demonstrate that the electrocatalytic activity is highly tun...

Photothermal Engineering of Graphene Plasmons.

Nanoscale photothermal sources find important applications in theranostics, imaging, and catalysis. In this context, graphene offers a unique suite of optical, electrical, and thermal properties, which we exploit to show self-consistent active photothermal modulation of its nanoscale response. In particular, we predict the existence of plasmons confined to the optical landscape tailored by continuous-wave external-light pumping of homogeneous graphene. This result relies on the high electron temperatures ac...

Graphene-based dual-band independently tunable infrared absorber.

In this paper, we theoretically demonstrate a dual-band independently tunable absorber consisting of a stacked graphene nanodisk and graphene layer with nanohole structure, and a metal reflector spaced by insulator layers. This structure exhibits a dipole resonance mode in graphene nanodisks and a quadrupole resonance mode in the graphene layer with nanoholes, which results in the enhancement of absorption over a wide range of incident angles for both TE and TM polarizations. The peak absorption wavelength ...

X-ray phase-contrast imaging with engineered porous materials over 50 keV.

X-ray phase-contrast imaging can substantially enhance image contrast for weakly absorbing samples. The fabrication of dedicated optics remains a major barrier, especially in high-energy regions (i.e. over 50 keV). Here, the authors perform X-ray phase-contrast imaging by using engineered porous materials as random absorption masks, which provides an alternative solution to extend X-ray phase-contrast imaging into previously challenging higher energy regions. The authors have measured various samples to d...

Quaternary Amine-Terminated Quantum Dots Induce Structural Changes to Supported Lipid Bilayers.

The cytoplasmic membrane represents an essential barrier between the cytoplasm and the environment external to cells. Interaction with nanomaterials can alter the integrity of the cytoplasmic membrane through the formation of holes and membrane thinning, which can ultimately lead to adverse biological impacts. Here we use supported lipid bilayers as experimental models for the cytoplasmic membrane to investigate the impact of quantum dots functionalized with the cationic polymer poly(diallyldimethylammonium...

Imaging Plasmon Hybridization of Fano Resonances via Hot-Electron-Mediated Absorption Mapping.

The inhibition of radiative losses in dark plasmon modes allows storing electromagnetic energy more efficiently than in far field excitable bright plasmon modes. As such, processes benefiting from the enhanced absorption of light in plasmonic materials could also take profit of dark plasmon modes to boost and control nanoscale energy collection, storage and transfer. We experimentally probe this process by imaging - with nanoscale precision - the hot-electron driven desorption of thiolated molecules from th...

Imaging Nanometer Phase Coexistence at Defects During the Insulator-Metal Phase Transformation in VO Thin Films by Resonant Soft X-Ray Holography.

We use resonant soft X-ray holography to image the insulator-metal phase transition in vanadium dioxide with element and polarization specificity and nanometer spatial resolution. We observe that nanoscale inhomogenity in the film results in spatial-dependent transition pathways between the insulating and metallic states. Additional nanoscale phases form in the vicinity of defects which are not apparent in the initial or final states of the system, which would be missed in area-integrated X-ray absorption m...

On the Significance of Systolic Flow Waveform on Aortic Valve Energy Loss.

This study aims to quantitatively and qualitatively assess energy dissipation in the aortic valve as a function of systolic aortic flow waveform representing pathologies where flow time-to-peak is delayed. A bioprosthetic valve was tested in the aortic position of a left-heart simulator under physiological pressure and flow conditions. The flow loop piston pump was programmed to generate three different flow waveforms each with a different peak time annotated as early peak (EP) with a rapid acceleration, mi...

Nonequilibrium Energetics of Molecular Motor Kinesin.

Nonequilibrium energetics of single molecule translational motor kinesin was investigated by measuring heat dissipation from the violation of the fluctuation-response relation of a probe attached to the motor using optical tweezers. The sum of the dissipation and work did not amount to the input free energy change, indicating large hidden dissipation exists. Possible sources of the hidden dissipation were explored by analyzing the Langevin dynamics of the probe, which incorporates the two-state Markov stepp...

GO-graphene ink-derived hierarchical 3D-graphene architecture supported FeO nanodots as high-performance electrodes for lithium/sodium storage and supercapacitors.

Transition metal oxides/carbon materials are of great interest for promising highly efficient energy storage applications owing to their low cost and eco-friendlines. Nevertheless, creating an electrode material with enhanced conductivity and electrochemical activity remains a great challenge. Here a design and fabrication of FeO nanodots (∼5.2 nm) loading onto the hierarchical three dimensional graphene (FeO/3D-graphene) via an interesting strategy is reported. The key factor in developing the unique 3...

Microwave-Assisted Rapid Synthesis of Graphene-Supported Single Atomic Metals.

Graphene-supported single atomic metals (G-SAMs) have recently attracted considerable research interest for their intriguing catalytic, electronic, and magnetic properties. The development of effective synthetic methodologies toward G-SAMs with monodispersed metal atoms is vital for exploring their fundamental properties and potential applications. A convenient, rapid, and general strategy to synthesize a series of monodispersed atomic transition metals (for example, Co, Ni, Cu) embedded in nitrogen-doped g...

Graphene-Complex-Oxide Nanoscale Device Concepts.

The integration of graphene with complex-oxide heterostructures such as LaAlO3/SrTiO3 offers the opportunity to combine the multifunctional properties of an oxide interface with the exceptional electronic properties of graphene. The ability to control interface conduction through graphene and understanding how it affects the intrinsic properties of an oxide interface are critical to the technological development of multifunctional devices. Here we demonstrate several device archetypes in which electron tran...

Correlation-Driven Dimerization and Topological Gap Opening in Isotropically Strained Graphene.

The phase diagram of isotropically expanded graphene cannot be correctly predicted by ignoring either electron correlations, or mobile carbons, or the effect of applied stress, as was done so far. We calculate the ground state enthalpy (not just energy) of strained graphene by an accurate off-lattice quantum Monte Carlo correlated ansatz of great variational flexibility. Following undistorted semimetallic graphene at low strain, multideterminant Heitler-London correlations stabilize between ≃8.5% and ≃...

Dynamic shear-lag model for understanding the role of matrix in energy dissipation in fiber-reinforced composites.

Lightweight and high impact performance composite design is a big challenge for scientists and engineers. Inspired from well-known biological materials, e.g., the bones, spider silk, and claws of mantis shrimp, artificial composites have been synthesized for engineering applications. Presently, the design of ballistic resistant composites mainly emphasizes the utilization of light and high-strength fibers, whereas the contribution from matrix materials receives less attention. However, recent ballistic expe...

FeO nanospheres in situ decorated graphene as high-performance anode for asymmetric supercapacitor with impressive energy density.

Unique nanostructure, high electrical conductivity, satisfactory energy density, and extraordinary cycling stability are important evaluation criteria for high-efficient energy storage devices. Herein, FeO nanospheres are successfully in situ decorated on graphene nanosheets through an environmentally benign and facile solvothermal procedure. When utilized as an electrode for supercapacitor, the graphene/FeO nanocomposite exhibits a notably enhanced specific capacity (268 F·g at 2 mV·s) and remarkable c...

Shear Deformation Dissipates Energy in Biofilaments.

Thermally fluctuating biofilaments possessing porous structures or viscoelastic properties exhibit energy losses from internal friction as well as external friction from drag. Prior models for internal friction account for energy dissipation solely from the dynamic bending of filaments. In this paper, we present a new energy dissipation model that captures the important effects of dynamic shear in addition to bending. Importantly, we highlight that shear-induced friction plays a major role in energy dissipa...

Terahertz super-resolution imaging using four-wave mixing in graphene.

A perfect lens made from negative refraction (NR) materials is utilized to overcome the diffraction limit. However, these NR lenses are realized by metamaterials, which suffer from high losses, and the volume is bulky. In this Letter, we propose a terahertz NR lens by using a four-wave mixing (FWM) process in graphene. NR is demonstrated because of the phase matching along the surface of graphene. Evanescent waves that store high spatial frequency information can be converted into propagating waves in the n...

Highly conductive, mechanically strong graphene monolith assembled by three-dimensional printing of large graphene oxide.

The manufacturing of three-dimensional (3D) graphene monolith with high mechanical and electrical performance has become an urgent issue in view of their potential applications in energy and electronics fields. Due to the structure rigidity and poor liquid-phase processing capability of graphene sheets, it is challenging to fabricate 3D graphene monolith with high mechanical performance, including strength, toughness and resiliency. Graphene oxide (GO) shows an improved dispersibility and reduction-restorab...

Gemstone spectral imaging in lung cancer: A preliminary study.

The present study aimed to evaluate the application of gemstone spectral imaging (GSI) for multi-parameter quantitative measurement in lung cancer.The study retrospectively enrolled 30 patients with lung cancer who underwent chest contrast enhanced CT scan with GSI mode. The GSI viewer was used for image display and data analysis. Optimal energy value, CT values at 40 keV, 70 keV and optimal energy level, spectral curve slope, effective atomic number (Zeff), iodine concentration (IC), and water concentratio...

Graphene-Based Nanomaterials and Their Applications in Biosensors.

Recently graphene has been drawing tremendous attention mainly due to its potential contributions to applications in biology, information technology and energy. Among these applications graphene-based biosensors have been particularly progressed caused in part by development of diverse derivatives of graphene such as graphene oxides (GOs) and graphene quantum dots (GQDs). In this chapter preparation and functionalization of the graphene and GOQs are described together with their optoelectronic properties. R...

Nano-imaging of an edge-excited plasmon mode in graphene.

The idea of squeezing optical field intensity into nanoscopic dimensions can be achieved through plasmon polaritons, where the prerequisite is to bridge the unmatched momentum of plasmons and free-space photons. Conventionally, complicated subwavelength structures or artificial dipole nanostructures are adopted to impart the necessary momentum for the plasmon excitation. In this work, we show that by using the near-field imaging technique, the plasmon can be launched directly from the edge of graphene lying...


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