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Cu nanowires (CuNWs) are considered as a promising candidate to develop high performance metal aerogels, yet the construction of robust and stable 3D porous structures remains challenging which severely limits their practical applications. Here, graphene‐hybridized CuNW (CuNW@G) core–shell aerogels are fabricated by introducing a conformal polymeric coating and in situ transforming it into multilayered...
Nanoparticles hold a great promise in biomedical science. However, due to their unique physical and chemical properties they can lead to overproduction of intracellular reactive oxygen species (ROS). As an important mechanism of nanotoxicity, there is a great need for sensitive and high‐throughput adaptable single‐cell ROS detection methods. Here, fluorescence lifetime imaging microscopy (FLIM) is...
In article number 1800573 by Xin Lou and co‐workers, an αvβ3‐specific Fe3O4‐RGD nanoprobe is prepared for in vivo magnetic resonance imaging of the collaterals after cerebral ischemia, and shows the binding specificity to the cerebral collaterals. The direct observation of cerebral collaterals is enabled in a quasi‐real time fashion, and further studies are also performed to show the collateral dynamics...
In article number 1800310, Nan Ma, Ulrike Alexiev, and co‐workers develop a sensitive and reproducible fluorescence lifetime based imaging assay (FLIM‐ROX) for reactive oxygen species (ROS) detection that allows the investigation of low cellular stress levels as a consequence of ROS production. Using FLIM‐ROX, the nanotoxicity of subcytotoxic amounts of nanoparticles is demonstrated by linking cellular...
In article number 1801023, Sung‐Hoon Ahn and co‐workers report shape memory alloy (SMA) microactuators providing an application for artificial muscle fibers. The diamond‐shaped frame structure of the actuators allows up to 60 percent strain in tensile motion and its high surface‐area‐to‐volume ratio enhances thermal response of SMA to achieve 1.6 kHz actuation speed with optical heating.
Carbon nanotubes (CNTs) exhibit a number of physicochemical properties that contribute to adverse biological outcomes. However, it is difficult to define the independent contribution of individual properties without purified materials. A library of highly purified single‐walled carbon nanotubes (SWCNTs) of different lengths is prepared from the same base material by density gradient ultracentrifugation,...
Converting solar energy into hydrogen via photoelectrochemical (PEC) water splitting is one of the most promising approaches for a sustainable energy supply. Highly active, cost‐effective, and robust photoelectrodes are undoubtedly crucial for the PEC technology. To achieve this goal, transition‐metal‐based electrocatalysts have been widely used as cocatalysts to improve the performance of PEC cells...
The new capabilities and functionalities of synthetic micro/nanomotors open up considerable opportunities for diverse environmental and biomedical applications. Water‐powered micromachines are particularly attractive for realizing many of these applications. Magnesium‐based motors directly use water as fuel to generate hydrogen bubbles for their propulsion, eliminating the requirement of common toxic...
Currently, metal‐organic frameworks (MOFs) are intensively studied as active materials for electrochemical energy storage applications due to their tunable structure and exceptional porosities. Among them, water stable pillared MOFs with dual ligands have been reported to exhibit high supercapacitor (SC) performance. Herein, the “One‐for‐All” strategy is applied to synthesize both positive and negative...
The increasing number of nanoparticles (NPs) being used in various industries has led to growing concerns of potential hazards that NP exposure can incur on human health. However, its global effects on humans and the underlying mechanisms are not systemically studied. Human embryonic stem cells (hESCs), with the ability to differentiate to any cell types, provide a unique system to assess cellular,...
Difficulty in visualizing glioma margins intraoperatively remains a major issue in the achievement of gross total tumor resection and, thus, better clinical outcome of glioblastoma (GBM) patients. Here, the potential of a new combined optical + optoacoustic imaging method for intraoperative brain tumor delineation is investigated. A strategy using a newly developed gold nanostar synthesis method,...
Ischemic stroke is one of the major leading causes for long‐term disability and mortality. Collateral vessels provide an alternative pathway to protect the brain against ischemic injury after arterial occlusion. Aiming at visualizing the collaterals occurring during acute ischemic stroke, an integrin αvβ3‐specific Fe3O4–Arg‐Gly‐Asp (RGD) nanoprobe is prepared for magnetic resonance imaging (MRI) of...
Organizing DNA origami building blocks into higher order structures is essential for fabrication of large structurally and functionally diverse devices and molecular machines. Unfortunately, the yields of origami building block attachment reactions are typically not sufficient to allow programed assembly of DNA devices made from more than a few origami building blocks. To investigate possible reasons...
Supercapacitors suffer from lack of energy density and impulse the energy density limit, so a new class of hybrid electrode materials with promising architectures is strongly desirable. Here, the rational design of a 3D hierarchical sandwich Co9S8/α‐MnS@N–C@MoS2 nanowire architecture is achieved during the hydrothermal sulphurization reaction by the conversion of binary mesoporous metal oxide core...
In article number 1800613, Haosheng Chen and co‐workers fabricate highly uniform thick coatings encapsulating microspheres. Heavy microspheres loaded in a rolling emulsion droplet (density ratio of the microspheres to droplet over 5) driven by the continuous flow in a pipe can be lifted to the center of the droplet against gravity by the hydrodynamic force generated in the lubrication film circulating...
Shape memory alloys (SMAs) are widely utilized as an actuation source in microscale devices, since they have a simple actuation mechanism and high‐power density. However, they have limitations in terms of strain range and actuation speed. High‐speed microscale SMA actuators are developed having diamond‐shaped frame structures with a diameter of 25 µm. These structures allow for a large elongation...
A fundamental understanding of the interplay between ligand‐removal kinetics and metal aggregation during the formation of platinum nanoparticles (NPs) in atomic layer deposition of Pt on TiO2 nanopowder using trimethyl(methylcyclo‐pentadienyl)platinum(IV) as the precursor and O2 as the coreactant is presented. The growth follows a pathway from single atoms to NPs as a function of the oxygen exposure...
Forming uniform thick coatings on microspheres remains a significant challenge in various surface modification and drug delivery applications. In this work, a hydrodynamic method is demonstrated for centering microspheres in droplets with sizes ranging from tens to hundreds of micrometers. The core microspheres stay at the center of the droplets due to the hydrodynamic pressure generated in the surrounding...
The emergence of flexible and wearable electronics has raised the demand for flexible supercapacitors with accurate sizes and aesthetic shapes. Here, a strategy is developed to prepare flexible all‐in‐one integrated supercapacitors by combining all‐freeze‐casting with typography technique. The continuous seamless connection of all‐in‐one supercapacitor devices enhances the load and/or electron transfer...
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