A5101902900- Carbon Nanotubes in Composites
- Advanced NMR Techniques and Applications
- NMR spectroscopy and applications
- Graphene research and applications
- Metal-Organic Frameworks: Synthesis and Applications
- Advancements in Battery Materials
- Protein Structure and Dynamics
- Nanopore and Nanochannel Transport Studies
- Chemical Synthesis and Characterization
- X-ray Diffraction in Crystallography
- Radioactive element chemistry and processing
- Spectroscopy and Quantum Chemical Studies
- Mesoporous Materials and Catalysis
- Genetic Mapping and Diversity in Plants and Animals
- Hydrocarbon exploration and reservoir analysis
- Electrostatics and Colloid Interactions
- Hemoglobin structure and function
- Fullerene Chemistry and Applications
- Cardiac electrophysiology and arrhythmias
- Boron and Carbon Nanomaterials Research
- Electrochemical Analysis and Applications
- GABA and Rice Research
- Advanced Battery Materials and Technologies
- Zeolite Catalysis and Synthesis
- Hydrogen Storage and Materials
China National Rice Research Institute
2024
University of North Carolina at Chapel Hill
2014-2024
Institute of Environment and Sustainable Development in Agriculture
2023
Chinese Academy of Agricultural Sciences
2023
Chinese Research Academy of Environmental Sciences
2023
Beijing Normal University
2023
Fujian Normal University
2022
University of Liverpool
2021
Beijing University of Technology
2021
Applied Physical Sciences (United States)
2015-2017
The effects of structure and morphology on lithium storage in single-wall carbon nanotube (SWNT) bundles were studied by electrochemistry nuclear magnetic resonance techniques. SWNTs chemically etched to variable lengths intercalated with Li. reversible Li capacity increased from LiC(6) close-end LiC(3) after etching, which is twice the value observed graphite. All nanotubes became metallic upon intercalation Li, density states at Fermi level increasing concentration. enhanced attributed...
Dye molecules (anthracene derivatives) are observed to strongly adsorb single-walled carbon nanotubes (SWNTs). The adsorption coverage of anthracene on SWNTs varied with the aromatic ring substituents. red shifts emission peaks absorptive adduct appear depend energy level lowest unoccupied molecular orbital (LUMO) adsorbate, consistent by a charge-transfer interaction, in which SWNT is electron donor and acceptor. adducts can be displaced pyrene.
The properties of nanoconfined and interfacial water in the proximity hydrophobic surfaces play a pivotal role variety important phenomena such as protein folding. Water inside single-walled carbon nanotubes (SWNTs) can provide an ideal system for investigating on surfaces, provided that be opened without introducing excess defects. Here, we report hydrophobic-hydrophilic transition upon cooling from 22 degrees C to 8 via observation adsorption isotherms SWNTs measured by nuclear magnetic...
Ion distribution in aqueous electrolytes near the interface plays a critical role electrochemical, biological and colloidal systems, is expected to be particularly significant inside nanoconfined regions. Electroneutrality of total charge regions commonly assumed priori solving ion by uncharged hydrophobic surfaces with no direct experimental validation. Here, we use quantitative nuclear magnetic resonance approach investigate properties graphitic-like nanoporous carbon. Substantial...
In this work, a mask-free method is introduced for patterned nitrogen doping of graphene using micro-plasma jet under ambient condition. Raman and X-ray photoelectron spectroscopy spectra indicate that atoms are incorporated into the lattice with two-dimensional spatial distribution precisely controlled in range mm down to 10 μm. Since chemistry can be by choice gas mixture, direct writing process versatile approach functionalization high resolution. This could have promising applications...
Ion transport through nanochannels is of fundamental importance in voltage-gated protein ion channels and energy storage devices. Direct microscopic observations are critical for understanding the intricacy ionic processes nanoconfinement. Here we report an situ nuclear magnetic resonance study hydration carbon nanopores. Nucleus-independent chemical shift was employed to monitor NaF aqueous electrolyte nanopores supercapacitors. The state revealed by shift, which sensitive number. A large...
Adsorption isotherms of methane and ethane in single-walled carbon nanotubes (SWNTs) were measured by ${}^{1}\mathrm{H}$ nuclear magnetic resonance (NMR) at room temperature. It is shown that the interior SWNTs becomes available for adsorption after cutting SWNTs. Such endohedral dominates SWNTs, least below 1 MPa. The average exchange time between molecules adsorbed inside free gas outside was estimated to be on order 80 ms. exposure oxygen has no effect suggesting energy small compared...
Reactions of VX [O-ethyl-S-(2-diisopropylethylamino)ethyl methylphosphonothioate], GD (pinacolyl methylphosphonofluoridate), and HD [bis(2-chloroethyl) sulfide] have been examined with nanotubular titania (NTT) using 31P 13C MAS NMR. All three agents hydrolyze on NTT the reaction being notably fast (t1/2 < 30 min), approaching rate achievable liquid decontaminants. NMR reveals that is adsorbed within tubules and/or its layers, perhaps providing optimum conditions for hydrolysis by water...
(1)H NMR spectroscopy is used to investigate a series of microporous activated carbons derived from poly(ether ether ketone) (PEEK) precursor with varying amounts burnoff (BO). In particular, properties relevant hydrogen storage are evaluated such as pore structure, average size, uptake, and binding energy. High-pressure in situ H(2) loading employed pressure ranging 100 Pa 10 MPa. An N(2)-cooled cryostat allows for isotherm measurements at both room temperature ( approximately 290 K) K. Two...
While the structural features and tunability of metal–organic frameworks (MOFs) make them promising materials for chemical warfare agent (CWA) hydrolysis, their stability performance in conditions varying humidity is an unsolved challenge. Understanding what design rules enable lasting hydrolytic functionality evolving field consequently essential to developing practical MOFs such applications. In this work, molecular dynamics simulations are carried out examine behavior water at various...
We report an in situ nuclear magnetic resonance (NMR) study of water adsorption a series activated carbon samples with pore sizes few nanometers down to the subnanometer scale (nanoporous carbon). Water exhibits S-shaped type V isotherms steep increase near certain vapor pressure. Using previously proposed isotherm model, size and distribution are derived from NMR data, they shown be good agreement results N2 adsorption. The change 1H spin–lattice relaxation time adsorbed H2O pressure is...
This review summarizes the recent advances of metal–organic framework-based membranes with ion selectivity for electrochemical energy storage and conversion applications.
Molecule immobilization in hydrothermally synthesized titania nanotubes is investigated by 13C solid-state NMR aided density functional theory calculations. The changes of spectra before and after indicate that phenols are chemisorbed aliphatic acid possibly physisorbed nanotubes. Hydroquinone exhibits monodentate bonds, catechol bidentate bonds to accessible surface Ti sites Immobilization anthrarobin confirms bonding favored over bonding. Density calculations at the B3LYP/6-311+G(2d,p)...
Properties of liquids at solid interfaces play a central role in numerous important processes nature. Nuclear magnetic resonance (NMR) is particularly useful for probing liquid/graphitic carbon interfacial properties. In particular, the nucleus-independent chemical shift (NICS) provides sensitive measure distance between adsorbates and graphitic surface on subnanometer scale, enabling NMR to acquire scale spatial resolution. Here, by combining information thermodynamics obtained from situ...
Dry-hot wind stress causes losses in wheat productivity major growing regions worldwide, especially for winter the Huang-Huai-Hai Plain of China, and both occurrence severity such events are likely to increase with global climate change. To investigate recovery physiological function yield formation using a non-commercial new chemical regulator (NCR) following dry-hot stress, we conducted three-year field experiment (2018-2021), sprayed tap water (control), monopotassium phosphate (CKP), NCR...
Water plays an important role in weak associations of small drug molecules with proteins. Intense focus has been on binding-induced structural changes the water network surrounding protein binding sites, especially their contributions to thermodynamics. However, is also tightly coupled conformations and dynamics, so far little known about influence water-protein interactions ligand binding. Alcohols are a type low-affinity drugs, it remains unclear how affects alcohol-protein interactions....