A5100608253- Fuel Cells and Related Materials
- Conducting polymers and applications
- Advanced ceramic materials synthesis
- Advanced Battery Materials and Technologies
- Polymer crystallization and properties
- ZnO doping and properties
- Gas Sensing Nanomaterials and Sensors
- Polymer Nanocomposites and Properties
- Material Properties and Applications
- Advancements in Battery Materials
- Copper-based nanomaterials and applications
- Ferroelectric and Piezoelectric Materials
- Organic Electronics and Photovoltaics
- Advanced materials and composites
- Aluminum Alloys Composites Properties
- Microplastics and Plastic Pollution
- Fiber-reinforced polymer composites
- Tribology and Wear Analysis
- Luminescence and Fluorescent Materials
- Carbon and Quantum Dots Applications
- Coal Combustion and Slurry Processing
- Forensic Fingerprint Detection Methods
- Military Defense Systems Analysis
- Simulation and Modeling Applications
- Engineering and Technology Innovations
Institute of Forensic Science
2024
University of Pennsylvania
2016-2020
Beijing Jiaotong University
1998-2018
Green Chemistry
2014
Henan Normal University
2014
Southeast University
2013
Peking University
2010
Nanjing Water Conservancy Planning & Design Institute (China)
2006
Ministry of Water Resources of the People's Republic of China
2006
Hong Kong Polytechnic University
2002
Controlling the self-assembled nanoscale ionic aggregates in single-ion conducting polymers is a crucial step toward exceptional transport properties. We report series of precisely segmented polyethylene-like materials containing sulfonate groups (PES23) with Li+, Na+, Cs+, or NBu4+ counterions synthesized from step-growth polymerization. At room temperature, all are semicrystalline well-defined layers separated by 35-38 Å, depending on cation. In situ X-ray scattering measurements reveal...
We report the synthesis of ionic telechelic low-molecular-weight polyethylenes (PEs) with precise chain lengths that are derived from plant oils along their morphologies and temperature-dependent conductivities. Starting C48 dimethyl ester, or C23 analogue for comparison, different carboxylate end groups (H+, Na+, Cs+, Zn2+) were introduced by microwave-assisted saponification chemistry. Because length polymethylene sequence, these difunctional PEs crystallize into exceptionally well-ordered...
Due to the synergistic contributions of graphene and ionic liquid, as-prepared RGO–Bi<sub>2</sub>WO<sub>6</sub> samples exhibited remarkably enhanced photocatalytic activities under visible light irradiation.
A series of polyethylene-like ionomers with periodic sulfonate groups were synthesized by polyesterification octatetracontane-1,48-diol and tetrabutylammonium dimethyl sulfosuccinate. Optional cation exchange in aqueous dispersions replaced the NBu4+ counterions for Na+ or Cs+. The defined microstructure polymers leads to formation layered structures bulk platelet-like self-stabilized nanoparticles dispersion, as observed X-ray scattering transmission electron microscopy. exhibit a...
Abstract High‐resolution visualization of latent fingerprints is key to effectively assessing crime scenes. Unconventional luminophores provide promising application potentials due facile preparation and excellent biocompatibility, but are rarely reported for imaging (LFPs). Here, a novel cost‐effective strategy developed prepare unconventional fluorescent magnetic mesoporous microspheres (UFMMMs) by growing silicon shell, templated designed amphipathic luminescent ( N...
Precisely controlling the position of ionic groups along neutral polymer backbones in ionomers has led to novel nanoscale morphologies and promising properties, although synthetic routes can be quite demanding. Here, we report a series Li+-containing directly synthesized from step-growth polymerization commercially available diol monomers (x = 6 or 12) dianhydride followed by neutralization with various amounts lithium salts. The results are nearly precise linear polymers wherein nonpolar...
Some types of precise polyethylenes, or linear polyethylenes containing precisely periodic functional groups, exhibit significant strain hardening under tensile deformation. Here we perform in situ X-ray scattering during deformation two polyethylenes: one with pendant carboxylic acid groups every 21st carbon (p21AA) and another imidazolium bromide 15th (p15ImBr). p21AA exhibits its layered structure orients the layer normal along axis, while p15ImBr does not perpendicular to axis....
Carboxylate was successfully introduced to the side chains of a polymer through careful formation mono-Grignard reagent from octyl 2,5-dibromothiophene-3-carboxylates at −40°C followed by nickel-catalyzed polymerization. The obtained poly(octyl thiophene-3-carboxylate) showed high regioregularity (head–tail/head–tail structure) but low yield. Factors affecting yield were carefully analyzed. Poly(3-octylthiophenecarboxylate-co-thiophene) prepared using Stille coupling reaction catalyzed...
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Graphene has many advantages such as high optical transmittance, low resistance, adjustable work function and stable physical chemical properties. quantum dots (GQDs) have unique properties excellent electronic conductivity. GQDs can effectively prolong the lifetime of carriers increase yield. In this study, reduced graphene oxide (RGO) solution was prepared by ultrasonic method, were one-step hydrothermal reaction which used slurry raw material. The particle size is 8~10 nm. Incorporation...
We have developed low dose diffraction mapping techniques for application to beam sensitive materials [1].By exposing the sample with a controlled of incident electrons, from crystalline regions is captured and used create contrast in an image reconstructed 4-dimensional dataset.These are applied model polyethylene (PE) as well precise acid-containing [2] poly 3-hexylthiophene (P3HT) [3], conjugated semiconducting polymer organic electronic devices.TEM acquisition parameters such probe size...
ZnO nanotetrapods were prepared by hydrothermal emulsion method. The X-ray diffraction result showed the hexagonal wurtzite structure of nanotetrapods. main morphology whiskers is a nanotetrapod, aside from sheet- and flower-shaped ZnO. Growth time cyclohexane dosage exert some influences on size In addition, aluminum doping plays an important role
ZnO: In (IZO, 10wt % 2 O 3 ) and Al (AZO, 1wt films were deposited on Corning glass substrates by RF magnetron sputtering. The samples either prepared unheated post annealed in N at different temperatures, or elevated temperatures. Electrical, optical structural properties investigated as a function of deposition temperature annealing temperature. Increasing the substrate heater would lead to decline electrical conductivity IZO films, while AZO showed unchanged performance range 150 - 300°C....
Regioregular poly (3-hexylthiophene) was synthesized by exchanging with Grignard agent followed coupling catalysis of Ni (dppp)Cl2. A nearly 100% HT-HT structure verified from 1H-NMR and 13C-NMR data analysis. This highly regioregular gives P3HT outstanding stability certain redshift absorption spectra found in contrast to materials lower regioregularity.
Layered potassium titanate is an important intermediate in preparing titania nanosheets. Three methods including method of stearate, stearic acid and high-temperature solid-state reaction were used to produce layered this paper. XRD SEM characterize the crystal structure shape. The result experiments showed that stearate was most effective way prepare titanate.
This paper presents the design of an axial-field permanent-magnet (PM) brushless dc motor drive for use on electric bicycle. Details and electronic converter are given. Performance analysis using finite element method is briefly discussed. A prototype was constructed verifying actual performance. Good correlation between theoretical experimental results has been obtained. Test confirmed feasibility proposed design.