A5101842960- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Microfluidic and Bio-sensing Technologies
- Advanced X-ray Imaging Techniques
- Electrowetting and Microfluidic Technologies
- Microfluidic and Capillary Electrophoresis Applications
- Electrocatalysts for Energy Conversion
- Gyrotron and Vacuum Electronics Research
- Catalytic Processes in Materials Science
- Copper-based nanomaterials and applications
- Quantum Dots Synthesis And Properties
- Nanomaterials for catalytic reactions
- nanoparticles nucleation surface interactions
- Electrochemical Analysis and Applications
- Graphene research and applications
- Laser-Plasma Interactions and Diagnostics
- Photonic and Optical Devices
- Gold and Silver Nanoparticles Synthesis and Applications
- Photocathodes and Microchannel Plates
- Advanced battery technologies research
- Heat and Mass Transfer in Porous Media
- Advanced Materials and Mechanics
- Modular Robots and Swarm Intelligence
- Laser-Matter Interactions and Applications
- Semiconductor Quantum Structures and Devices
Zhejiang University
2014-2024
State Key Laboratory of Silicon Materials
2016-2024
Southeast University
2024
State Key Laboratory of Millimeter Waves
2024
Hangzhou Xixi hospital
2019
Sir Run Run Shaw Hospital
2019
Hangzhou Academy of Agricultural Sciences
2018
University of Cambridge
2017
Singapore University of Technology and Design
2017
Southeast University
2017
Sub-nanometric Pd clusters on porous nanorods of CeO2 (PN-CeO2) with a high dispersion 73.6% exhibit the highest catalytic activity and best chemoselectivity for hydrogenation nitroarenes to date. For 4-nitrophenol, catalysts yield TOF ∼44059 h(-1) 4-aminophenol >99.9%. The superior performance can be attributed cooperative effect between highly dispersed sub-nanometric hydrogen activation unique surface sites PN-CeO2 concentration oxygen vacancy an energetically geometrically preferential...
We report the first experimental results on a high-gain harmonic-generation (HGHG) free-electron laser (FEL) operating in ultraviolet. An 800 nm seed from Ti:sapphire has been used to produce saturated amplified radiation at 266 third harmonic. The confirm predictions for HGHG FEL operation: stable central wavelength, narrow bandwidth, and small pulse-energy fluctuation.
Abstract Nanocrystal (NC) morphology, which decides the number of active sites and catalytic efficiency, is strongly determined by gases involved in synthesis, treatment, reaction. Myriad investigations have been performed to understand morphological response gases. However, most prior work limited low pressures, far beyond realistic conditions. A dynamic evolution palladium–copper (PdCu) NC within a nanoreactor reported, with atmospheric pressure hydrogen at atomic scale. In situ...
Designing lasing wavelengths and modes is essential to the practical applications of nanowire (NW) lasers. Here, according localized photoluminescence spectra, we first demonstrate ability define over a wide range (up 119 nm) based on an individual bandgap-graded CdSSe NW by forward cutting from CdSe CdS end. Furthermore, free spectral (FSR) obtained lasers could be controlled backward end step-by-step. Interestingly, single-mode laser with predefined wavelength realized in short NWs because...
Atomically precise metal clusters have attracted increasing interest owing to their unique size-dependent properties; however, little has been known about the effect of size on catalytic properties at single-cluster level. Here, by real-time monitoring with single-molecule fluorescence microscopy process individual Au single-turnover resolution, we study behaviors gold (Au) level, and then observe strong clusters, in both product formation dissociation processes. Surprisingly, indicated...
Engineering of support facet and metal valence states is recognized as an effective strategy for manipulating the sintering dispersion nanoparticles (NPs). Here, we report unusual state-independent but facet-dependent effect sintering/dispersion behaviors Pd NPs on anatase TiO2 surfaces, which confirmed by density functional theory (DFT) calculation in situ environmental scanning transmission electron microscopy (ESTEM). All species, including atoms Pd2+ ions, sintered (100) surface through...
In this paper, we present a novel, simple lab-on-a-chip device for continuous separation of particles by size. The is composed straight rectangular microchannel connecting two inlet reservoirs and exit reservoirs. Two asymmetric, 3-D electrodes are embedded along the channel wall to generate non-uniform electrical field dielectrophoresis. Particles with different sizes collected at Main flow induced pressure difference between used successfully 5 10 mum latex yeast cells white blood cells. A...
Abstract Herein, a type of Fe, N‐codoped carbon electrocatalyst (FeN x /C, Fe‐N‐BCNT#BP) containing bamboo nanotubes and displaying bifunctional high catalytic efficiency for both oxygen reduction reaction (ORR) dioxide (CO2RR) is reported. It shows electrocatalytic activity stability the ORR process with onset potential 1.03 V RHE in alkaline CO2RR to CO faradic up 90% selectivity about 100% at low overpotential 0.49 V. For CO, it revealed that Fe 3 C active but FeN centers lower than...
The study of modulated electron beams is important because they can be used to produce coherent radiation, but the modulations cause unwanted instabilities in some devices. Specifically, a free laser, proper prebunching at desired emission frequency enhance performance, while bunching resulting from and bunch compression schemes degrade performance. In photoinjector accelerator, tailoring shape drive laser pulse could as technique either or mitigate effect these modulations. This work...
The purpose of this study is to investigate electro-osmotic flow in a free surface-guided microchannel. Although multiphase microfluidics has attracted interests over the past few years, involving surfaces yet be studied great detail. Several proposed theoretical models describing type need verified by experiments. In work, microchannel was fabricated using an innovative fabrication process. Because liquid stream confined surface properties, solid sidewalls did not exist Instead, were...
The induced-charge electrophoretic (ICEP) motion of ideally polarizable particles in a microchannel is numerically studied this paper. A complete 3-D multi-physics model set up to simulate the transient ICEP spherical microchannel. study shows that non-uniform distribution induced surface charge occurs when an particle immersed externally applied electric field, resulting varying slipping (EOF) velocity along particle's and hence producing micro vortexes liquid. numerical results verify...
Abstract Optical waveguides fabricated in single crystals offer crucial passive/active optical components for photonic integrated circuits. Single possess inherent advantages over their amorphous counterpart, such as lower losses visible‐to‐mid‐infrared band, larger peak emission cross‐section, higher doping concentration. However, the writing of Type‐I positive refractive index modified using femtosecond laser technology presents significant challenges. Herein, this work introduces a novel...
Pd@Ru nanoplates with controlled thickness were synthesized and exhibited substantially enhanced properties for the hydrogen evolution reaction relative to commercial catalysts.
Abstract Nanocrystal (NC) morphology, which decides the number of active sites and catalytic efficiency, is strongly determined by gases involved in synthesis, treatment, reaction. Myriad investigations have been performed to understand morphological response gases. However, most prior work limited low pressures, far beyond realistic conditions. A dynamic evolution palladium–copper (PdCu) NC within a nanoreactor reported, with atmospheric pressure hydrogen at atomic scale. In situ...
Achieving metal nanocrystals with metastable phase draws much attention due to their anticipated fascinating properties, wheras it is still challenging because polymorphism nature and transition mechanism remain elusive. Here, stability of face-centered cubic (fcc) Pd was studied via in situ spherical aberration (Cs)-corrected transmission electron microscopy (TEM). By constructing a well-defined Pd/C composite structure, encapsulated by graphite, the dispersion process fcc observed through...
Bimetallic core-shell nanoparticles have received considerable attention for their unique optical, magnetic and catalytic properties. However, these properties will be dramatically modified under ambient conditions by structure and/or composition change. Thus, it is of primary importance to study the complex transformation pathway at an elevated temperature. In this work, using aberration-corrected scanning transmission electron microscope equipped with energy dispersive X-ray mapping...
Stomata control gas exchange and water transpiration are one of the most important physiological apparatuses in higher plants. The regulation stomatal aperture is closely coordinated with photosynthesis, nutrient uptake, plant growth, development, so on. With advances scanning electron microscopy (SEM), high-resolution images stomata cell surfaces can be obtained from detached tissues. However, this method does not allow for rapid analysis dynamic variation situ under nondestructive...
Exploring advanced electrocatalysts to accelerate the sluggish oxygen reduction reaction (ORR) in polymer electrolyte membrane fuel cells (PEMFCs) is a promising route alleviate current challenges of fossil exhaustion and environment pollution. Herein, carbon-supported highly dispersed PtNi nanocatalyst (Pt0.61Ni/C) with low platinum content 2.76 wt % was prepared simply based on galvanic replacement for high-efficiency ORR process. It presents mass activity ∼5 times conventional Pt-based...