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PubMed Journal Database | Nanotechnology RSS

03:50 EDT 25th May 2019 | BioPortfolio

The US National Library of Medicine and National Institutes of Health manage PubMed.gov which comprises of more than 29 million records, papers, reports for biomedical literature, including MEDLINE, life science and medical journals, articles, reviews, reports and  books.

BioPortfolio aims to cross reference relevant information on published papers, clinical trials and news associated with selected topics - speciality.

For example view all recent relevant publications on Epigenetics and associated publications and clincial trials.

Showing PubMed Articles 1–25 of 1,300+ from Nanotechnology

Monolithic 3D-Printing of embeddable and highly stretchable strain sensors using conductive ionogels.

Medical training simulations that utilize 3D-printed, patient-specific tissue models improve practitioner and patient understanding of individualized procedures and capacitate pre-operative, patient-specific rehearsals. The impact of these novel constructs in medical training and pre-procedure rehearsals has been limited, however, by the lack of effectively embedded sensors that detect the location, direction, and amplitude of strains applied by the practitioner on the simulated structures. The monolithic f...

Monolithic radio frequency SiNx self-rolled-up nanomembrane interdigital capacitor modeling and fabrication.

Monolithic capacitors operating at radio frequencies (RF) serves as critical components in integrated circuits (ICs) for wireless communication. Design and fabrication innovations for high capacitance density RF capacitors are highly desired for the miniaturization of RFIC chips. However, practical and simple solutions are limited by existing capabilities in three-dimensional (3D) structure construction and the effective configuration of electrodes. We report a unique route to achieve unprecedentedly high c...

Halbach array assisted assembly of orderly aligned nickel nanowire networks as transparent conductive films.

The aspect ratio and arrangement of nanowires play an important role in achieving excellent optoelectronic performance for metal nanowire-based transparent conductive films (TCFs). However, limited to the technology and material properties, studies are always only focus on one of the issues. Here, a novel strategy for manipulating the relative aspect ratio and arrangement of nickel nanowires (NiNWs) at nanoscale by Halbach array assisted assembly technology is introduced. Head-to-tail nickel nanowire chains...

Metasurface-enhanced optical lever sensitivity for atomic force microscopy.

We proposed the integration of metasurfaces on atomic force microscopy (AFM) cantilevers to improve the optical lever sensitivity. The metasurface positioned at the back of an AFM cantilever enables anomalous reflection of the laser beam and provides a nonlinear relationship between the incidence and reflection angles following the generalized Snell's law. Therefore, the displacement of the reflected laser spot at the photo-detector can be amplified. The metasurface was composed of 30 nm thick Au nano-discs...

Effect of layer and stacking sequence in simultaneously grown 2H and 3R WS2 atomic layers.

In two-dimensional layered materials, layer number and stacking order have strong effects on the optical and electronic properties. Tungsten disulfide (WS<sub>2</sub>) crystal, as one important member among transition metal dichalcogenides (TMDCs), has been usually prepared in a layered 2H prototype structure with space group P63/mmc (D<sub>6h</sub><sup>4</sup>) in spite of many other expected ones such as 3R. Here, we repor...

Experimental and Theoretical Study on the Microparticle Trapping and Release in a Deformable Nano-Sieve Channel.

Deformable microfluidics may be potentially used in cell manipulation, optical sensing, and imaging applications, and have drawn considerable scientific interests in the recent past. The excellent tunability of deformable microfluidic devices can provide controllable capture, deposition, and target release. We demonstrated a one-dimensional nano-sieve device to capture microparticles from suspensions. Size-selective capturing and release of micro- and nanoparticles was achieved by simply adjusting the flow ...

Binder free carbon nanofiber electrodes derived from polyacrylonitrile-lignin blends for high performance supercapacitors.

Lignin was blended with polyacrylonitrile (PAN) in different ratios and fabricated into carbon nanofiber electrodes by electrospinning followed by thermal stabilization, carbonization and subsequent activation by CO<sub>2</sub> of the carbonized mats. These carbon fiber electrodes exhibit high surface area, high mesoporosity, high graphitic content and high electrical conductivity. Activated carbon nanofiber (ACNF) mats derived from PAN:Lignin 70:30 blends display a surface area ...

Recent Progress in Near-Field Nanolithography using Light Interactions with Colloidal Particles: From Nanospheres to three-dimensional Nanostructures.

The advance of nanotechnology is firmly rooted in the development of cost-effective, versatile, and easily accessible nanofabrication techniques. The ability to pattern complex two-dimensional and three-dimensional nanostructured materials are particularly desirable, since they can have novel physical properties that are not found in bulk materials. This review article will report recent progress in utilizing self-assembly of colloidal particles for nanolithography. In these techniques, the near-field inter...

Facile and scalable fabrication of self-assembled Cu architecture with superior antioxidative properties and improved sinterability as a conductive ink for flexible electronics.

The inherent susceptibility to oxidation and poor sinterability significantly limit the practical application of Cu-based conductive inks. Most methodologies employed for the inks like organic polymer coatings and inorganic metal deposition are generally ineffective. Herein, we report the design of a novel hierarchical Cu architecture to simultaneously improve the antioxidative and sinterability via a self-passivation mechanism and loose interior structures. The hierarchical Cu architecture was prepared usi...

Nanoparticles induced limitless spiral of polyacetylene isomers.

Helical nanomaterials represent an emerging group of nanostructures because of their multiple functionalities enabled by unique spiral geometry and nanoscale dimension. This study demonstrates that several trans-transoid polyacetylene (Tt-PA) chains can self-spiral limitlessly over the whole length of polymers to form regular multiple helices under the inducement of water cluster, fullerene ball and metallic nanoparticles (NPs). Multi-helices possess random chirality selection which have equal probability o...

Light-assisted recovery of reacted MoS2 for reversible NO2 sensing at room temperature.

Two-dimensional (2D) nanomaterials have been extensively explored as promising candidates for gas sensing due to their high surface-to-volume ratio. Among many 2D nanomaterials, molybdenum disulfide (MoS2) is known to be functional in detecting harmful gases at room temperature; therefore, it has been actively studied as a gas-sensing material. However, there has been a limitation in recovering the original signal from reacted MoS2 after exposure to the target gas. This work demonstrates the recovery of the...

Integrated solid electrolyte with porous cathode by facilely one-step sintering for all-solid-state Li-O2 battery.

All-solid-state Li-O2 batteries are receiving intense interests because of the substitution of solid electrolytes for toxic and flammable liquid electrolytes. However, new issues arise in the aspect of electrolyte-cathode interface. On one hand, in traditional sandwiched battery structure, the reaction sites of cathode are restricted to finite planar electrode-electrolyte interface, resulting in limited performances of all-solid-state Li-O2 batteries. On the other hand, integrating electrolyte with cathode ...

High efficient photo detector by using ZnO nanowire arrays on highly aligned electrospun PVDF-TrFE nanofiber film.

Zinc oxide is one of the versatile semiconductor materials and its use is expanding into photoelectric applications. Anisotropic growth characteristics of zinc oxide are advantageous in growing a nanowire structure. A zinc oxide nanowire based sensor exhibits enhanced performance in terms of detecting gas-phase chemicals due to its large specific surface area. Recent studies have focused on improving performance parameters including sensitivity, efficiency, and stability. A nanostructured thin film exhibits...

Impacts of interface contaminations on the MoS2 field effect transistors and a modified fabrication process to pursuit better interface quality.

The interface of the two-dimensional material plays a crucial role in the properties of the material itself. When 2D materials are used as channel for electrical devices, negative influence from surface contaminations during fabrication process should be avoided to ensure the device performance and the reliability. In this article, the impacts as well as its mechanisms of interface contaminations on MoS2 field effect transistors were studied. An effective method using an atomic layer deposition (ALD) grown ...

Nanoscale resistive switching memory devices: a review.

In this review the different concepts of nanoscale resistive switching memory devices are described and classified according to their I-V behaviour and the underlying physical switching mechanisms. By means of the most important representative devices, the current state of electrical performance characteristics is illuminated in-depth. Moreover, the ability of resistive switching devices to be integrated into state-of-the-art CMOS circuits under the additional consideration with a suitable selector device f...

Hybrid mesoporous silica nanospheres modified by poly (NIPAM-co-AA) for drug delivery.

The synthesis of drug delivery systems based on surface-modified mesoporous silica hollow structures remains a huge challenge. In this paper, we have obtained hollow mesoporous silica nanoparticles (MSNs) by surfactant directed sol-gel assisted hydrothermal treatment. The MSNs have the inorganic-organic hybrid frameworks with uniform diameter distribution (260 nm), and their specific surface area, mesoporous size and pore volume are 540 m2/g, 3.7 nm, 0.58 cm3/g, respectively. It was proved that the preparat...

Biocompatible gold nanoclusters: synthetic strategies and biomedical prospects.

The latest advances concerning ultra-small gold nanoparticles (≤ 2 nm) commonly known as gold nanoclusters (AuNCs) are reviewed and discussed in the context of biological and biomedical applications (labeling, delivery, imaging and therapy). A great diversity of synthetic methods has been developed and optimized aiming to improve the chemical structures and physico-chemical properties of the resulting AuNCs. The main synthetic approaches were surveyed with emphasis on methods leading to water-soluble AuNC...

Realization of red shift of absorption spectra using optical near-field effect.

In many applications such as CO<sub>2</sub> reduction and water splitting, high-energy photons in the ultraviolet region are required to complete the chemical reactions. However, to realize sustainable development, the photon energies utilized must be lower than the absorption edge of the materials including the metal complex for CO<sub>2</sub> reduction, the electrodes for water splitting, because of the huge amount of lower energy than the visible re...

One-step synthesis of positively charged bifunctional carbon dots/silver composite nanoparticles for killing and fluorescence imaging of Gram-negative bacteria.

Positively charged C-dots/Ag composite nanoparticles were synthesized via the facile one-step hydrothermal reaction of L-arginine and silver nitrate. L-arginine was used not only as the carbon and nitrogen sources of N-doped C-dots but also as the reducing agent of silver ions. It was noteworthy that the resulting C-dots were negatively charged but the simultaneous reduction of silver ions made the resulting C-dots/Ag composite nanoparticles become positively charged. Furthermore, as compared to C-dots, the...

Hybrid graphene-manganite thin film structure for magnetoresistive sensor application.

An increasing demand of magnetic field sensors with high sensitivity at room temperatures and spatial resolution at micro-nanoscales has resulted in numerous investigations of physical phenomena in advanced materials, and fabrication of novel magnetoresistive devices. In this study the novel magnetic field sensor based on combination of a single layer graphene (SLG) and thin nanostructured manganite La<sub>0.8</sub>Sr<sub>0.2</sub>MnO<sub&gt...

Co3O4 hollow nanospheres/carbon-assembled mesoporous polyhedron with internal bubbles encapsulating TiO2 nanosphere for high-performance lithium ion batteries.

Co3O4 hollow nanospheres with 15 nm in the diameter were assembled to the mesoporous polyhedron together with carbon. Within the Co3O4 polyhedrons, the bubbles with 300-500 nm in diameter were uniformly generated. Every bubble further encapsulated one TiO2 nanosphere, forming a unique sphere-bubble structure. The specific surface area and the pore volume were calculated to be 97.85 m2 g-1 and 0.31 cm3 g-1. When evaluated as anode material for lithium ion batteries, the as-prepared material exhibited superio...

Electromagnetic interference shielding in X band with aero-GaN.

We investigate the electromagnetic shielding properties of an ultra-porous lightweight nanomaterial named aerogalnite or simply aero-GaN. Aerogalnite is made of randomly arranged hollow GaN microtetrapods, which were obtained by direct growth using hydride vapour phase epitaxy of GaN on the sacrificial network of ZnO microtetrapods. A 2-mm thick aerogalnite sample exhibits electromagnetic shielding properties in the X band similar to solid structures based on metal foams or carbon nanomaterials and having t...

The liquid-exfoliation of graphene assisted with hyperbranched polyethylene-g-polyhedral oligomeric silsesquioxane copolymer and its thermal property in polydimethylsiloxane nanocomposite.

Thermal interface materials with high thermal conductivity are essential to transfer the redundant heat and improve the reliability of integrated circuits. Here we reported high thermal conductivity in polydimethylsiloxane (PDMS) nanocomposite incorporated with few-layer graphene, which was exfoliated in chloroform with assistance of hyperbranched polyethylene-g-polyhedral oligomeric silsesquioxane copolymer (HBPE@POSS) as the stabilizer. In order to improve the compatibility and enhance the thermal propert...

Enhanced synergistic effects from multiple iron oxide nanoparticles encapsulated within nitrogen-doped carbon nanocages for simple and label-free visual detection of blood glucose.

Hollow-structured carbon materials play a crucial role in research of biosensor, energy storage, and nanomedicine as a kind of material with advantages like high surface area, tunable pore volume, excellent mechanical properties, and good biocompatibility. Herein, we developed a simple, facile and controllable method for synthesis of Fe3O4 nanoparticles-encapsulated in hollow carbon nanocages (FNHCs) with SiO2 nanospheres as a sacrificial template. Owing to the unique structure of multiple Fe3O4 nanoparticl...

Damage-free mica/MoS2 interface for high-performance multilayer MoS2 field-effect transistors.

For top-gated MoS2 field-effect transistors, damaging the MoS2 surface to the MoS2 channel are inevitable due to chemical bonding and/or high-energy metal atoms during the vacuum deposition of gate dielectric, thus leading to degradations of field-effect mobility (μFE) and subthreshold swing (SS). A top-gated MoS2 transistor is fabricated by directly transferring a 9-nm mica flake (as gate dielectric) onto the MoS2 surface without any chemical bonding, and exhibits excellent electrical properties with an o...


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