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The development of efficient bifunctional catalysts for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is of extreme importance for future renewable energy systems. This Communication reports the recent finding that room‐temperature treatment of CoO nanowire array on Ti mesh by NaBH4 in alkaline media leads to in situ development of CoB nanoparticles on nanowire surface...
In article number 1701136, by Mehmet Cagatay Tarhan and co‐workers, MEMS tweezers allow the manipulation of biological samples such as individual microtubules. Bridging between parallel walls, these 25 nm diameter tubular structures can be picked by sharp protruding tips. Motorized stage positions target the location with high precision to place the microtubules carried between the tips. Repeating...
An assay for protein dimers using surface‐enhanced Raman scattering (SERS) is presented, in article number 1700802, by Sebastian Schlücker and co‐workers. Site‐specific binding of the Survivin protein dimer to molecularly functionalized gold nanoparticles results in the formation of protein‐bridged dimers of gold nanoparticles. The dimers exhibit the characteristic SERS spectrum of Raman reporter...
A facet‐selective atomic layer deposition method is developed to fabricate oxide nanofence structure to stabilize Pt nanoparticles. CeOx is selectively deposited on Pt nanoparticles' (111) facets and naturally exposes Pt (100) facets. The facet selectivity is realized through different binding energies of Ce precursor fragments chemisorbed on Pt (111) and Pt (100), which is supported by in situ mass...
Owing to the progressive development of metal–organic‐frameworks (MOFs) synthetic processes and considerable potential applications in last decade, integrating biomolecules into MOFs has recently gain considerable attention. Biomolecules, including lipids, oligopeptides, nucleic acids, and proteins have been readily incorporated into MOF systems via versatile formulation methods. The formed biomolecule‐MOF...
Modification of the local density of optical states using metallic nanostructures leads to enhancement in the number of emitted quanta and photocatalytic turnover of luminescent materials. In this work, the fabrication of a metamaterial is presented that consists of a nanowire separated from a metallic mirror by a polymer thin film doped with a luminescent organometallic iridium(III) complex. The...
The optical properties of the newly developed near‐infrared emitting formamidinium lead triiodide (FAPbI3) nanocrystals (NCs) and their polycrystalline thin film counterpart are comparatively investigated by means of steady‐state and time‐resolved photoluminescence. The excitonic emission is dominant in NC ensemble because of the localization of electron–hole pairs. A promisingly high quantum yield...
Water oxidation, also known as the oxygen evolution reaction (OER), is a crucial process in energy conversion and storage, especially in water electrolysis. The critical challenge of the electrochemical water splitting technology is to explore alternative precious‐metal‐free catalysts for the promotion of the kinetically sluggish OER. Recently, emerging two‐dimensional (2D) ultrathin materials with...
In article number 1700818, Daesub Song, Seungjoo Haam, and co‐workers, propose poly (aniline‐co‐pyrrole) polymerized nanoregulators (PASomes) with an amphiphilic methoxy polyethylene glycol‐block‐polyphenylalanine co‐polymer (mPEG‐b‐pPhe) to regulate intracellular ROS levels. PASomes are water‐soluble, biocompatible, and could suppress viral infection, thereby increasing the cell survival rate.
A systematic cytotoxicity study of layered black phosphorus (BP) is urgently needed before moving forward to its potential biomedical applications. Herein, bulk BP crystals are synthesized and exfoliated into layered BP with different lateral size and thickness. The cytotoxicity of as‐exfoliated layered BP is evaluated by a label‐free real‐time cell analysis technique, displaying a concentration‐,...
Bulk black phosphorus (BP) crystals are synthesized and exfoliated into layered BP with different lateral size and thickness, in article number 1701210 by Qing Zhao, Qingfeng Yan, and Baoshan Xing, and co‐workers. The results of real‐time cell analysis (RTCA) display a concentration‐, size‐, and cell type‐dependent cytotoxicity of layered BP. The cytotoxicity originates from the intracellular ROS...
Nanoparticles delivering drugs, disseminating cancer cells, and red blood cells (RBCs) during splenic filtration must deform and pass through the sub‐micrometer and high aspect ratio interstices between the endothelial cells lining blood vessels. The dynamics of passage of particles/cells through these slit‐like interstices remain poorly understood because the in vitro reproduction of slits with physiological...
An assay for Survivin, a small dimeric protein which functions as modulator of apoptosis and cell division and serves as a promising diagnostic biomarker for different types of cancer, is presented. The assay is based on switching on surface‐enhanced Raman scattering (SERS) upon incubation of the Survivin protein dimer with Raman reporter‐labeled gold nanoparticles (AuNP). Site‐specificity is achieved...
Reactive oxygen species (ROS) produced during mitochondrial oxidative phosphorylation play an important role as signal messengers in the immune system and also regulate signal transduction. ROS production, initiated as a consequence of microbial invasion, if generated at high levels, induces activation of the MEK (mitogen‐activated protein kinase kinase)/ERK (extracellular signal‐regulated kinase)...
Suspension cells can provide a source of cells for cellular reprogramming, but they are difficult to transfect by nonviral vectors. An efficient and safe nonviral vector (GO‐Fe3O4‐PEI complexes) based on iron oxide nanoparticle (Fe3O4)‐decorated graphene oxide (GO) complexed with polyethylenimine (PEI) for the first time is developed for delivering three individual episomal plasmids (pCXLE‐hOCT3/4‐shp53,...
Intracellular transport is affected by the filament network in the densely packed cytoplasm. Biophysical studies focusing on intracellular transport based on microtubule–kinesin system frequently use in vitro motility assays, which are performed either on individual microtubules or on random (or simple) microtubule networks. Assembling intricate networks with high flexibility requires the manipulation...
Emulation of biological synapses is necessary for future brain‐inspired neuromorphic computational systems that could look beyond the standard von Neuman architecture. Here, artificial synapses based on ionic‐electronic hybrid oxide‐based transistors on rigid and flexible substrates are demonstrated. The flexible transistors reported here depict a high field‐effect mobility of ≈9 cm2 V−1 s−1 with...
Highly uniform hierarchical Mo–polydopamine hollow spheres are synthesized for the first time through a liquid‐phase reaction under ambient temperature. A self‐assembly mechanism of the hollow structure of Mo–polydopamine precursor is discussed in detail, and a determined theory is proposed in a water‐in‐oil system. Via different annealing process, these precursors can be converted into hierarchical...
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