A5077944578- Catalytic Processes in Materials Science
- Advanced biosensing and bioanalysis techniques
- CO2 Reduction Techniques and Catalysts
- Catalysts for Methane Reforming
- Catalysis and Oxidation Reactions
- Catalysis and Hydrodesulfurization Studies
- Electrocatalysts for Energy Conversion
- Supramolecular Self-Assembly in Materials
- Machine Learning in Materials Science
- Synthetic Organic Chemistry Methods
- Advanced Photocatalysis Techniques
- Ammonia Synthesis and Nitrogen Reduction
- RNA Interference and Gene Delivery
- Carbon dioxide utilization in catalysis
- Modular Robots and Swarm Intelligence
- Organometallic Complex Synthesis and Catalysis
- Membrane Separation and Gas Transport
- Mesoporous Materials and Catalysis
- Ionic liquids properties and applications
- Cardiovascular Function and Risk Factors
- Natural Compound Pharmacology Studies
- Cardiac Imaging and Diagnostics
- Quantum Dots Synthesis And Properties
- Molecular Junctions and Nanostructures
- MXene and MAX Phase Materials
Columbia University
2019-2025
Stony Brook University
2021-2025
Zunyi Medical University
2020-2022
Affiliated Zhongshan Hospital of Dalian University
2020-2022
Brookhaven National Laboratory
2022
University of Missouri
2017-2020
Dalian University
2020
Huaqiao University
2019-2020
University of Otago
2018
Highly effective and selective noble metal-free catalysts attract significant attention. Here, a single-atom iron catalyst is fabricated by saturated adsorption of trace onto zeolitic imidazolate framework-8 (ZIF-8) followed pyrolysis. Its performance toward catalytic transfer hydrogenation furfural comparable to state-of-the-art up four orders higher than other Fe catalysts. Isotopic labeling experiments demonstrate an intermolecular hydride mechanism. First principles simulations,...
Manipulating the selectivity-determining step in post-C–C coupling is crucial for enhancing C2 product specificity during electrocatalytic CO2 reduction, complementing efforts to boost rate-determining kinetics. Here we highlight role of single-site noble metal dopants on Cu surfaces influencing C–O bond dissociation an oxygen-bound intermediate, steering toward ethylene versus ethanol. Integrating theoretical and experimental analyses, demonstrate that oxygen binding strength surface...
Controlling the three-dimensional (3D) nanoarchitecture of inorganic materials is imperative for enabling their novel mechanical, optical, and electronic properties. Here, by exploiting DNA-programmable assembly, we establish a general approach realizing designed 3D ordered frameworks. Through templating DNA frameworks liquid- vapor-phase infiltrations, demonstrate successful nanofabrication diverse classes from metal, metal oxide semiconductor materials, as well combinations, including...
Engineering the assembly of nanoscale objects into complex and prescribed structures requires control over their binding properties. Such might benefit from a well-defined bond directionality, ability to designate engagements through specific encodings, capability coordinate local orientations. Although much progress has been achieved in our design nano-objects, challenges creating such nano-objects with fully controlled modes understanding fundamental properties are still outstanding. Here,...
"Single-atom" catalysts (SACs) have demonstrated excellent activity and selectivity in challenging chemical transformations such as photocatalytic CO2 reduction. For heterogeneous SAC systems, it is essential to obtain sufficient information of their structure at the atomic level order understand reaction mechanisms. In this work, a was prepared by grafting molecular cobalt catalyst on light-absorbing carbon nitride surface. Due sensitivity X-ray absorption near edge (XANES) spectra subtle...
Doped heavy metal-free III-V semiconductor nanocrystal quantum dots (QDs) are of great interest both from the fundamental aspects doping in highly confined structures, and applicative side utilizing such building blocks fabrication p-n homojunction devices. InAs nanocrystals (NCs), that particular relevance for short-wave IR detection emission applications, manifest n-type character poising a challenge their transition to p-type behavior. The NCs is presented with Zn - enabling control over...
Directing the formation of nanoscale architectures from nanoparticles is one key challenges in designing nanomaterials with prescribed functions. Atomic systems, given their ability to form molecules and crystals via directional chemical bonds, provide an inspiration for establishing approaches where designed anisotropic binding modalities can be assembled into architectures. However, fabricating such has been challenging due small dimensions limited ways site-specific control surface. To...
We report the oxygen reduction reaction (ORR) activity in acid of an Fe porphyrin on different supports. While is high (E1/2 = 0.34 V vs RHE with n 3.8) when adsorbed XC72 (a graphitic carbon), this much lower either MoS2 −0.15 2.2) or g-C3N4 −0.24 3.1). Electron paramagnetic resonance (EPR), X-ray absorption fine structure (XAFS), and magnetometry measurements show electronic around center same for all three Only supported exhibits a pH dependence its ORR activity. This observation, coupled...
The ability to fabricate materials and devices by-design at small scales, largely based in advances lithographic additive manufacturing methods, has led the tremendous technological progress of last decades. However, growing need structure 3D nanoscale matter for emergent functions, according design a massively parallel manner, requires new means material fabrication. Here, we demonstrate concept experimental realization encoded assembly nanoparticles into prescribed, hierarchically ordered...
Could one manipulate nanoscale building blocks using chemical reactions like molecular synthesis to yield new supra-nanoscale objects? The precise control over the final architecture might be challenging due size mismatch of molecularly scaled reactive functional groups and blocks, which limits a valence specific locations reaction spots. Taking advantage programmable octahedral DNA frame, we report facile approach engineering between toward formation controlled nanoarchitectures. Azide...
A series of supported 3% MoOx catalysts were synthesized by incipient-wetness impregnation a 5–15% TaOx surface-modified γ-Al2O3 support. The characterized in situ spectroscopies (diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), Raman, UV–vis, X-ray absorption (XAS)) and multiple chemical probes (C2H4/C4H8 titration, C3H6-TPSR, steady-state propylene metathesis, NH3-IR adsorption). tantalum oxide phase was present as surface sites on the support that capped Al2O3...
The detection of testosterone in aqueous solutions is a difficult task due to the low concentration levels that are relevant environmental and physiological samples. Current analytical methods expensive and/or complex. To address this issue, we fabricated molecularly imprinted polymer (MIP) photonic film for water. films were obtained using colloidal crystals as templates pore morphology. Monodispersed silica particles with an average diameter 330 nm used obtain crystal by vertical...
The ability to create nanoengineered silicon carbide (SiC) architectures is important for the diversity of optical, electronic, and mechanical applications. Here, we report a fabrication periodic three-dimensional (3D) SiC nanoscale using self-assembled designed 3D DNA-based framework. assembly followed by templating into silica subsequent conversion lower temperature pathway (<700 °C) via magnesium reduction. formed framework lattice has unit size about 50 nm domains over 5 μm, it preserves...
With heterogeneous catalysts, chemical promotion takes place at their surfaces. Even in the case of single-atom alloys, where small quantities a reactive metal are dispersed within main host, it is assumed that both elements exposed and available to bond with reactants. Here, we show, on basis situ X-ray absorption spectroscopy data, alloy catalysts made from Pt highly diluted Cu atoms located inner interface between nanoparticles silica support instead. Kinetic experiments indicated these...
A series of supported ReOx catalysts were synthesized by incipient-wetness impregnation perrhenic acid onto one component (Al2O3 and SiO2) surface-modified mixed-oxide supports (SiO2/Al2O3, Al2O3/SiO2, ZSM-5 (Si/Al = 15)), characterized with in situ molecular spectroscopy (Raman, DRIFTS, UV–vis, XAS), chemically probed (ammonia chemisorption, C2H4/C4H8-titration, C3H6-TPSR, steady-state propylene self-metathesis). The initial dehydrated surface rhenia species coordinated to the oxide as...
A combination of several in situ techniques (XRD, XAS, AP-XPS, and E-TEM) was used to explore links between the structural chemical properties a Cu@TiOx catalyst under CO2 hydrogenation conditions. The active phase involved an inverse oxide/metal configuration, but initial core@shell motif disrupted during pretreatment H2. As consequence strong metal–support interactions, titania shell cracked, Cu particles migrated from core on top oxide with simultaneous formation Cu–Ti–Ox phase. generated...
Abstract Fe 3 O 4 adsorbent with 2D structures was synthesized via solvothermal method and its application in arsenic removal investigated. Isotherms were generated at pH=4.7 7.6 the results best fitted by Freundlich isotherm model; good As(V) adsorption capacity achieved for both pH values. Furthermore, effects evaluated; optimal value 8.27 efficiency being 18.55 mg/g 93.69%, respectively. Based on measurements of zeta potential particle size adsorbent, we proposed that overall dependence a...
Objective: a dried blood spot (DBS) method integrated with direct infusion mass spectrometry (MS) focused on metabolomic analysis was applied to detect and compare the difference of metabolites between heart failure (HF) patients non-HF in order facilitate early detection failures, provide targeted intervention offer prognostic insights. Methods: we used an untargeted metabolic approach. The dry analyze 23 types amino acids 26 carnitine samples. In current study, 49 were selected establish...
Ceramic membranes suffer from rapid permeability loss during filtration of organic matter due to their fouling propensity. To address this problem, iron oxide ultrafiltration were coated with poly(sulfobetaine methacrylate) (polySBMA), a superhydrophilic zwitterionic polymer. The ceramic-organic hybrid membrane was characterized by scanning electron microscopy (SEM) and optical profilometry (OP). Membranes without polySBMA coating subjected bovine serum albumin solution. Hydraulic cleaning...
Metal–ligand complexes have been extensively explored as well-defined molecular catalysts in small molecule activation reactions such carbon dioxide (CO2) reduction. Many hybrid photocatalysts prepared by coupling with photoactive surfaces for use solar CO2 In this work, we employ X-ray absorption near edge structure (XANES) and extended fine (EXAFS) spectroscopies, density functional theory (DFT) computational XANES modeling to interrogate the of a photocatalyst consisting macrocyclic...
The ability to fabricate materials and devices by-design at small scales, largely based in advances lithographic additive manufacturing methods, has led the tremendous technological progress of last decades. However, growing need structure 3D nanoscale matter for emergent functions, according design a massively parallel manner, requires new means material fabrication. Here, we demonstrate concept experimental realization encoded assembly nanoparticles into prescribed, hierarchically ordered...