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PubMed Journal Database | ACS nano RSS

10:11 EDT 27th May 2019 | BioPortfolio

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Showing PubMed Articles 1–25 of 2,400+ from ACS nano

Controlled Hydrolysis of Metal-Organic Frameworks: Hierarchical Ni/Co-Layered Double Hydroxide Microspheres for High Performance Supercapacitors.

Pseudomorphic conversion of Metal-Organic Frameworks (MOFs) enables the fabrication of nanomaterials with well-defined porosities and morphologies for enhanced performances. However, the commonly reported calcination strategy usually requires high temperature to pyrolyze MOF particles and often results in uncontrolled growth of nanomaterials. Herein, we report the controlled alkaline hydrolysis of MOFs to produce layered double hydroxide (LDH) while maintaining the porosity and morphology of MOF particles. ...

Single Molecule Identification and Quantification of Glycosaminoglycans using Solid State Nanopores.

Glycosaminoglycans (GAGs) are a class of polysaccharides with potent biological activities. Due to their complex and heterogeneous composition, varied charge, polydispersity, and presence of isobaric stereoisomers, the analysis of GAG samples poses considerable challenges to current analytical techniques. In the present study, we combined solid-state nanopores, a single molecule sensor, with a support vector machine (SVM), a machine learning algorithm, for the analysis of GAGs. Our results indicate that the...

High-Energy-Density Hydrogen-Ion-Rocking-Chair Hybrid Supercapacitors Based on Ti3C2Tx MXene and Carbon Nanotubes Mediated by Redox Active Molecule.

MXenes have emerged as promising high-volumetric-capacitance supercapacitor electrode material, whereas their voltage windows are not wide. This disadvantage prevents MXenes from being made into aqueous symmetric supercapacitors with high energy density. To attain high energy density, constructing asymmetric supercapacitors is a reliable design choice. Here, we propose a strategy to achieve high energy density of hydrogen ion aqueous-based hybrid supercapacitors by integrating a negative electrode of Ti3C2T...

Biohybrid Vaccines for Improved Treatment of Aggressive Melanoma with Checkpoint Inhibitor.

Recent approaches in the treatment of cancer focus on involving the immune system to control the tumor growth. The administration of immunotherapies, like checkpoint inhibitors, has shown impressive results in the long term survival of patients. Cancer vaccines are being investigated as further tools to prime tumor-specific immunity. Biomaterials show potential as adjuvants in the formulation of vaccines, and biomimetic elements derived from the membrane of tumor cells may widen the range of antigens contai...

Canalicular Junctions in the Osteocyte Lacuno-Canalicular Network of Cortical Bone.

The osteocyte lacuno-canalicular network (LCN) is essential for bone remodeling since osteocytes regulate cell recruitment. This has been proposed to occur through liquid flow induced shear forces in the canaliculi. Models of the LCN have thus far assumed that it contains canaliculi connecting the osteocyte lacunae. However, here we reveal that enlarged spaces occur at places where several canaliculi cross; we name these spaces canalicular junctions. We characterize them in detail within mice cortical bone ...

Steering the Achiral into Chiral with a Self-Assembly Strategy.

Chirality transfers from self-assembly of achiral titanyl phthalocyanine (TiOPc) to its top-sitting TiOPc molecule has been successfully achieved. The TiOPc molecules first assemble into a porous network on Au(111) that contains periodic chiral voids, each being fenced by four axially rotating TiOPc molecules in upward adsorption geometry where their ending O atoms exclusively point away from the substrate. Additional top-sitting TiOPc molecule turns out to be chiral upon adsorption on a chiral void with it...

Time-Resolved Analysis of the Structural Dynamics of Assembling Gold Nanoparticles.

The hydrophobic collapse is a structural transition of grafted polymer chains in a poor solvent. Although such a transition seems an intrinsic event during clustering of polymer-stabilized nanoparticles in the liquid phase, it has not been resolved in real time. In this work, we implemented a microfluidic 3D-flow-focusing mixing reactor equipped with real-time analytics, small-angle X-ray scattering (SAXS) and UV-Vis-NIR spectroscopy, to study the early stage of cluster formation, for polystyrene-stabilized...

"Ship in a Bottle" Design of Highly Efficient Bifunctional Electrocatalysts for Long-Lasting Rechargeable Zn-Air Batteries.

Poor durability of bifunctional oxygen electrocatalysts is one main bottleneck that suppresses the widespread application of rechargeable metal-air batteries. Herein, a "ship in a bottle" design is achieved by impregnating fine transition metal dichalcogenide nanoparticles into defective carbon pores which act as interconnected nanoreactors. The erected 3D porous conductive architecture provides a "highway" for expediting charge/mass transfer. This design not only delivers a high surface-to-volume ratio to ...

In Situ Plasmonic Nanospectroscopy of the CO Oxidation Reaction over Single Pt Nanoparticles.

The ongoing quest to develop single particle methods for the in situ study of heterogeneous catalysts is driven by the fact that heterogeneity in terms of size, shape, grain structure and composition is a general feature among nanoparticles in an ensemble. This heterogeneity hampers the generation of deeper understanding for how these parameters affect catalytic properties. Here we present a solution that in a single benchtop experimental setup combines single particle plasmonic nanospectroscopy with mass s...

Configurational Design of Mechanical Perturbation for Fine Control of Twisted DNA Origami Structures.

DNA origami nanotechnology allows us to rationally design molecular devices with arbitrary shapes and properties through programming the sequence of DNA bases for their directed self-assembly. Despite its remarkable shape programmability, it has not been fully explored yet how to precisely control the twisted shape of DNA origami structures shown to be important in controlling the physical properties of DNA devices, building DNA superstructures, and synthesizing macroscopic soft materials with targeted prop...

Thermal Stability of Gold/Palladium Octopods Studied In Situ in 3D: Understanding Design Rules for Thermally Stable Metal Nanoparticles.

Multifunctional metal nanoparticles (NPs) such as anisotropic multimetallic NPs are crucial for boosting nanomaterial based applications. Advanced synthetic protocols exist to make a large variety of such nanostructures. However, a major limiting factor for the usability of them in real life applications is their stability. Here, we show that Au/Pd octopods, 8-branched nanocrystals with O symmetry, with only a low amount of Pd exhibited a remarkable thermal stability and maintained strong plasmon resonances...

Engineering Micromotors with Droplet Microfluidics.

Micromotors have promising potential in applications ranging from environmental remediation to targeted drug delivery and noninvasive microsurgery. However, there are inadequacies in the fabrication of artificial micromotors to improve the design of structure and composition for motion performance and multifunctionality. Here, we present a microfluidic fiber-confined approach to creating droplet-templated micromotors with precisely-engineered anisotropies in 3D structures and material compositions. The shap...

Point Defects and Localized Excitons in 2D WSe.

Identifying the point defects in 2D materials is important for many applications. Recent studies have proposed that W vacancies are the predominant point defect in 2D WSe, in contrast to theoretical studies, which predict that chalcogen vacancies are the most likely intrinsic point defects in transition metal dichalcogenide semiconductors. We show using first principles calculations, scanning tunneling microscopy (STM) and scanning transmission electron microscopy experiments, that W vacancies are not prese...

Nanoparticle Size and Coating Chemistry Control Foliar Uptake Pathways, Translocation and Leaf-to-Rhizosphere Transport in Wheat.

Nano-enabled foliar-applied agrochemicals can potentially be safer and more efficient than conventional products. However, limited understanding about how nanoparticle properties influence their interactions with plant leaves, uptake, translocation through the mesophyll to the vasculature, and transport to the rest of the plant prevents rational design. This study used a combination of Au quantification and spatial analysis to investigate how size (3, 10 or 50nm) and coating chemistry (PVP- vs citrate-) of ...

Soft Three-Dimensional Robots with Hard Two-Dimensional Materials.

Inspired by biological organisms, soft engineered robots seek to augment the capabilities of rigid robots by providing safe, compliant, and flexible interfaces for human-machine interactions. Soft robots provide significant advantages in applications ranging from pick-and-place, prostheses, wearables, and surgical and drug-delivery devices. Conventional soft robots are typically composed of elastomers or gels, where changes in material properties such as stiffness or swelling control actuation. However, sof...

Amorphous Tin Oxide Nanohelix Structures Based Electrode for Highly Reversible Na-Ion Batteries.

An array of amorphous tin oxide (a-SnO) nanohelixes (NHs) was fabricated on copper foil as an electrode for Na-ion batteries via oblique angle deposition method, solution-and-surfactant-free process. The combination of the amorphous phase SnO with a low oxidation number and its vertically-aligned NH geometry with a large surface area and high porosity, which facilitate Na-ion dynamics and accommodate the volume changes, enabled a reversible capacity ranging up to 915 mA h g after 50 cycles, fast rate capabi...

Unraveling the Radiative Pathways of Hot Carriers upon Intense Photoexcitation of Lead Halide Perovskite Nanocrystals.

The slowdown of carrier cooling in lead halide perovskites (LHP) may allow the realization of efficient hot carrier solar cells. Much of the current effort focuses on the understanding of the mechanisms that retard the carrier relaxation while proof-of-principle demonstrations of hot carrier harvesting have started to emerge. Less attention has been placed on the impact that the energy and momentum relaxation slowdown imparts on the spontaneous and stimulated light emission process. LHP nanocrystals (NCs) p...

Understanding Enantioselective Interactions by Pulling Apart Molecular Rotor Complexes.

Enantioselective interactions underpin many important phenomena from biological mechanisms to chemical catalysis. In this regard, there is great interest in understanding these effects at the molecular level. Surfaces provide a platform for these studies and aid in the long-term goal of designing heterogeneous enantiospecific interfaces. Herein we report a model system consisting of molecular rotors, one intrinsically chiral (propylene oxide), and one that becomes chiral when adsorbed on a surface (propene)...

Iron-Doping-Induced Phase Transformation in Dual Carbon Confined Cobalt Diselenide Enabling Superior Lithium Storage.

Transition metal chalcogenides (TMCs) have been investigated as promising anodes for high-performance lithium-ion batteries, but they usually suffer from poor conductivity and large volume variation, thus leading to unsatisfied performance. Although nanostructure engineering and hybridization with conductive materials have been proposed to address this concerning, a better performance towards practical device applications is still highly required. Herein, we reported an iron-doping-induced structural phase ...

Nanoparticles to Knockdown Osteoporosis-Related Gene and Promote Osteogenic Markers Expression for Osteoporosis Treatment.

Osteoporosis is the most common disease involving bone degeneration. Current clinical treatments are not able to offer a satisfying curative effect, so the development of effective treatments is desired. Gene silencing through siRNA delivery has gained great attention as a potential treatment in bone diseases. SOST gene inhibits the Wnt signaling pathway reducing osteoblast differentiation. Consequently, silencing SOST gene with a specific siRNA could be a potential option to treat osteoporosis. Generally, ...

Fast Electrochemical Storage Process In Sputtered Nb2O5 Porous Thin Films.

The formation of thin film electrode exhibiting high capacity and high rate capabilities is challenging in the field of miniaturized electrochemical energy storage. Here, we present an elegant strategy to tune the morphology and the properties of sputtered porous Nb2O5 thin films deposited on Si-based substrates via magnetron sputtering deposition technique. Kinetic analysis of the redox reactions is studied to qualify the charge storage process, where we observe a non-diffusion controlled mechanism within ...

Atomically Precise, Thiolated Copper-Hydride Nanoclusters as Single-Site Hydrogenation Catalysts for Ketones in Mild Conditions.

Copper-hydrides are known catalysts for several technologically important reactions such as hydrogenation of CO, hydroamination of alkenes and alkynes, and chemoselective hydrogenation of unsaturated ketones to unsaturated alcohols. Stabilizing copper-based particles by ligand chemistry to nanometer-scale is an appealing route to make active catalysts with optimized materials economy, however, it has been long believed that the ligand-metal interface, particularly if sulfur-containing thiols are used as sta...

Controlling the Revolving and Rotating Motion Direction of Asymmetric Hexameric Nanomotor by Arginine Finger and Channel Chirality.

Nanomotors in nanotechnology are as important as engines in daily life. Many ATPases are nanoscale biomotors classified into three categories based on the motion mechanisms in transporting substrates: linear, rotating, and the recently discovered revolving motion. Most biomotors adopt a multi-subunit ring-shaped structure that hydrolyzes ATP to generate force. How these biomotors control the motion direction and regulate the sequential action of their multiple subunits are intriguing. Many ATPase are hexame...

Highly Strained III-V-V Coaxial Nanowire Quantum Wells with Strong Carrier Confinement.

Coaxial quantum wells (QWs) are ideal candidates for nanowire (NW) lasers, providing strong carrier confinement and allowing close matching of the cavity mode and gain medium. We report a detailed structural and optical study and the observation of lasing for a mixed group-V GaAsP NW with GaAs QWs. This system offers a number of potential advantages in comparison to previously studied common group-V structures ( e. g., AlGaAs/GaAs) including highly strained binary GaAs QWs, the absence of a lower band gap c...

Direct Vapor-Liquid-Solid Synthesis of All-Inorganic Perovskite Nanowires for High-Performance Electronics and Optoelectronics.

Controlled synthesis of lead halide perovskite (LHP) nanostructures not only benefits fundamental research but also offers promise for applications. Among many synthesis techniques, although catalytic vapor-liquid-solid (VLS) growth is recognized as an effective route to achieve high-quality nanostructures, until now, there is not any detailed report on VLS grown LHP nanomaterials due to the emerging challenges in perovskite synthesis. Here, we develop a direct VLS growth for single-crystalline all-inorgani...


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