A new and facile way to synthesize a free-standing flexible surface-enhanced Raman scattering (SERS) substrate has been successfully developed, where high SERS-active Ag dimers or aligned aggregates are assembled within poly(vinyl alcohol) (PVA) nanofibers with chain-like arrays via electrospinning technique. The aggregation state of the obtained nanoparticle larger, which formed in concentrated PVA solution, makes significant contribution sensitivity SERS 4-mercaptobenzoic acid (4-MBA)...

In this paper, different NaOH concentrations (2, 5, 10, and 15 M) were used to treat {001}TiO2. The effect of on the crystal structure, morphology, optical properties, light raw electronic-hole recombination, degradation performance {001}TiO2 methylene blue studied. results demonstrate that rutile TiO2 appeared when concentration was as high 10 M, showing much better photolytic than others. As sodium hydroxide increases, morphology changes accordingly. specific surface area increases...

Abstract The high cost of proton exchange membrane water electrolysis (PEMWE) originates from the usage precious materials, insufficient efficiency, and lifetime. In this work, an important degradation mechanism PEMWE caused by dynamics ionomers over time in anode catalyst layer (ACL), which is a purely mechanical microstructure, identified. Contrary to conventional understanding that microstructure ACL static, micropores are inclined be occupied due localized swelling/creep/migration,...

We report an environmentally benign process for the synthesis of nearly monodisperse silver nanoparticles in large quantities via a microwave-assisted “green” chemistry method aqueous system, using basic amino acids, such as l-lysine or l-arginine, reducing agents and soluble starch protecting agent. The presence acids with basicity having two groups each molecule, is indispensable uniform nanoparticles. current synthetic can be readily applied to large-scale production, example, reaction...

A novel method is reported to create inorganically connected nanocrystal (NC) assemblies for both II-VI and IV-VI semiconductors by removing surfactant ligands using (NH4)2S. This surface modification process differs from ligand exchange methods in that no new are introduced the post-treated NC surfaces nearly bare. The detailed mechanism study shows high reactivity between (NH4)2S metal-surfactant complexes enables complete removal of seconds converts metal-rich shells into metal sulfides....

Abstract One‐dimensional nanomaterials and their assemblies attract considerable scientific interest in the physical, chemical, biological fields because of potential applications electronic optical devices. The interface‐assembly method has become an important route for self‐assembly nanoparticles, nanosheets, nanotubes, nanorods, but ultralong nanowires only been successful using Langmuir–Blodgett approach. A novel approach spontaneous formation highly aligned, Ag nanowire films at...

In the theranostic field, a near-infrared (NIR) laser is located in optical window, and up-conversion nanoparticles (UCNPs) could be potentially utilized as imaging agents with high contrast. Meanwhile, copper sulfide (CuS) has been proposed photothermal agent increased temperature under NIR laser. However, there still no direct effective strategy to integrate hydrophobic UCNPs CuS until now. Herein, we propose an situ growth routine based on core/shell combined ultrasmall water-soluble...

The stability analysis of the $n=1$ resistive wall mode is carried out for a simplified model collisionless tokamak plasma. It found that trapped particle compressibility and resonance between precession drift frequency lead to significant improvement beta limits. shown that, within frame model, can be fully suppressed plasma stable up limits slow rotation.

A double hydrophilic block copolymer (DHBC) is used as a crystal-growth modifier for controlled self-assembly of complex and unusual calcite pancakes with multiple stacked porous layers (see Figure), based on polymer-directed crystallization mechanism. The results demonstrate that it possible to manipulate the ability selective adsorption stabilization DHBCs in order control directed crystal growth process. Supporting information this article available WWW under...

Stabilizing modes that limit plasma beta and reduce their deleterious effect on rotation are key goals for the efficient operation of a fusion reactor. Passive stabilization active control global kink/ballooning resistive wall (RWMs) have been demonstrated NSTX research is now advancing towards understanding physics reliably maintaining high confident extrapolation to ITER component test facility based spherical torus. Active n = 1 experiments with an expanded sensor set, combined low levels...

The resistive wall mode (RWM) instability in high-beta tokamaks is stabilized by energy dissipation mechanisms that depend on plasma rotation and kinetic effects. Kinetic modification of ideal stability calculated with the “MISK” code [B. Hu et al., Phys. Plasmas 12, 057301 (2005)] outlined. For an advanced scenario ITER [R. Aymar Nucl. Fusion 41, 1301 (2001)] plasma, present calculation finds alpha particles are required for RWM at presently expected levels rotation. stabilization theory...

Experimental observation of resistive wall mode (RWM) instability in the National Spherical Torus Experiment (NSTX) at plasma rotation levels intermediate to ion precession drift and bounce frequencies suggests that low critical threshold models are insufficient. Kinetic modifications ideal stability criterion yield a more complex relationship between RWM stability. Good agreement is found an experimental marginal point calculated with kinetic effects included, by MISK code. By...

In this paper, monodisperse Pd nanocrystals were immobilized on previously reported carbon nanospheres via in situ adsorption and reduction. protocol, no excess reductant capping reagents necessary, which made the surface of as-prepared nanocatalysts very clean. Using sodium tetrachloropalladate(II) as metal precursor yielded palladium with a size around 5 nm regardless loading, while use chloride resulted increase to 18.1 nm. Moreover, additives used during preparation have been proven be...

We report the observation of very high triplet–triplet annihilation (TTA) upconversion efficiency in single-sensitizer/multiacceptor systems. A hetero-TTA process between triplet acceptors different types is believed to account for synergistic effect leading efficiency. The quantum yield dual-acceptor system much higher than sum two single-acceptor

Abstract A novel method for the shape‐controlled synthesis of uniformly‐shaped poly( p ‐phenylenediamine) (P PD) microparticles with different morphologies under ambient condition has been developed using HAuCl 4 as an oxidant and N ‐vinylpyrrolidone) (PVP) a surfactant. The results demonstrate that these can be varied from symmetrical spindle‐like to diamond‐like, centrosymmetric leaf‐like, parallelogram‐like by tuning concentration reactants their molar ratios. length varies 6 8 µm while...

A new kind of silver indium tungsten oxide (AgIn(WO4)2) mesocrystals with high hierarchy can be synthesized by a microwave-assisted approach, which shows and selective photocatalytic activity for the degradation different organic dyes under UV visible light irradiation.

Using N,N′-dicyclohexylcarbodiimide (DCC) and l-serine as biologic additives, rutile TiO2 hollow spheres assembled by nanorods can be synthesized a simple hydrothermal reaction route. A distinctive crystallization transformation route of the has been proposed, which includes emergence polycrystalline, mesoscale to mesocrystals with morphologies sectors, bundles rods based on oriented attachment, simultaneous process sectors solid spheres, cavitating through Ostwald ripening mechanism. Two...

Limitation of 3D construction ability, complex preparation processes and developing customer demands have promoted people to find low-cost, rapid prototyping, simple operation methods produce novel functional devices in the near future. Among various techniques, 3D-printed technology is a promising candidate for fabrication biosensors biomedical detection with wide variety potential applications. This review offers four important printing techniques their The principle process technologies...

Surface-enhanced Raman scattering (SERS) technology, as an important analytical tool, has been widely applied in the field of chemical and biomedical sensing. Automated testing is often combined with biochemical analysis technologies to shorten detection time minimize human error. The present SERS substrates for sample are time-consuming subject high error, which not conducive combination automated testing. Here, a novel honeycomb-inspired microarray designed large-area urease saliva samples...

Abstract Background The decreasing costs of sequencing, along with the growing understanding epigenetic mechanisms driving diseases, have led to increased application chromatin immunoprecipitation (ChIP), Cleavage Under Targets & Release Using Nuclease (CUT&RUN) and Tagmentation (CUT&TAG) sequencing—which are designed map DNA or chromatin-binding proteins their genome targets—in biomedical research. Existing software tools, namely peak-callers, available for analyzing data from...