A5071143092- Advanced NMR Techniques and Applications
- Diamond and Carbon-based Materials Research
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Fiber-reinforced polymer composites
- biodegradable polymer synthesis and properties
- Carbon Dioxide Capture Technologies
- NMR spectroscopy and applications
- Solid-state spectroscopy and crystallography
- Carbon Nanotubes in Composites
- Polymer crystallization and properties
- Metal-Organic Frameworks: Synthesis and Applications
- Force Microscopy Techniques and Applications
- Atomic and Subatomic Physics Research
- Extraction and Separation Processes
- Radioactive element chemistry and processing
- Additive Manufacturing and 3D Printing Technologies
- Microplastics and Plastic Pollution
- High-pressure geophysics and materials
- Synthetic Organic Chemistry Methods
- Material Dynamics and Properties
- Fullerene Chemistry and Applications
- Carbon dioxide utilization in catalysis
- Machine Learning in Materials Science
- Perovskite Materials and Applications
Oak Ridge National Laboratory
2021-2025
NOAA Chemical Sciences Laboratory
2025
University of New Mexico
2019-2024
Physical Sciences (United States)
2024
University of Michigan
2014-2018
Oklahoma State University
2010-2014
Martin Luther University Halle-Wittenberg
2013
North Carolina State University
2011
Quantum sensors based on nitrogen-vacancy centers in diamond have emerged as a promising detection modality for nuclear magnetic resonance (NMR) spectroscopy owing to their micrometer-scale volume and noninductive-based detection. A remaining challenge is realize sufficiently high spectral resolution concentration sensitivity multidimensional NMR analysis of picoliter sample volumes. Here, we address this by spatially separating the polarization phases experiment microfluidic platform. We...
Separating rare earth elements is a daunting task due to their similar properties. We report "tug of war" strategy that employs lipophilic and hydrophilic ligand with contrasting selectivity, resulting in magnified separation target elements. Specifically, novel water-soluble bis-lactam-1,10-phenanthroline an affinity for light lanthanides coupled oil-soluble diglycolamide selectively binds heavy lanthanides. This two-ligand yields quantitative the lightest (e.g., La-Nd) heaviest Ho-Lu)...
Soft, fully renewable vitrimers have been introduced to circumvent the lack of recyclability traditional elastomers with permanent cross-linked structures, while preserving advantages rheo-structural stability, and mechanical properties.
The surging demand for high-purity individual lanthanides necessitates the development of novel and exceptionally selective separation strategies. At heart these systems is an organic compound that, based on its structural features, selectively recognizes lighter or heavier in trivalent lanthanide (Ln) series. This work emphasizes significant implications resulting from modifying donor group configuration within N,O-based tetradentate ligand changes solvation environment Ln ions process...
Ferroelectric materials exhibit switchable remanent polarization due to reversible symmetry breaking under an applied electric field. Previous research has leveraged temperature-induced neutral-ionic transitions in charge-transfer (CT) cocrystals access ferroelectrics that operate through displacement of molecules However, displacive ferroelectric behavior is rare organic CT and achieving a Curie temperature (TC ) above ambient been elusive. Here cocrystal between acenaphthene...
A comprehensive minimalistic model for spontaneous structural transition that is governed by distinct molecular interactions.
Open AccessCCS ChemistryRESEARCH ARTICLES18 Oct 2022A Novel Dynamic Polymer Synthesis via Chlorinated Solvent Quenched Depolymerization Jiadeng Zhu, Sheng Zhao, Jiancheng Luo, Wei Niu, Joshua T. Damron, Zhen Zhang, Md Anisur Rahman, Mark A. Arnould, Tomonori Saito, Rigoberto Advincula, Alexei P. Sokolov, Bobby G. Sumpter and Peng-Fei Cao Zhu Chemical Sciences Division, Oak Ridge National Laboratory, Ridge, Tennessee 37831 , Zhao Departmnet of Chemistry, University Tennessee, Knoxville, 37996...
One of the grand challenges underlying current direct air capture (DAC) technologies relates to intensive energy cost for sorbent regeneration and CO2 release, making massive scale (GtCO2 /year) deployment required have a positive impact on climate change economically unfeasible. This challenge underscores critical need develop new DAC processes with substantially reduced energies. Here, we report photochemically-driven approach release by exploiting unique properties an indazole...
We present a streamlined method to covalently bond hydroxylated carbon nanotubes (CNOH) within polyphenol matrix, all achieved through direct, solvent-free process. Employing an extremely small concentration of CNOH (0.01% w/w) along with topologically contrasting linkers led maximum 5-fold increase in modulus and 25% enhancement tensile strength compared the unaltered order magnitude greater reinforcement (w/w) state-of-the-art melt-processed nanocomposites. Through dynamic mechanical...
Zeolite-catalyzed alkane C–H bond activation reactions carried out at room temperature, low pressure, and reagent loadings demonstrate that water can act either to increase or suppress the observed reaction rates. Isobutane-d10 undergoes hydrogen/deuterium exchange with acidic zeolite HZSM-5 subambient temperatures, as first reported by us (Truitt et al. J. Am. Chem. Soc. 2004, 126, 11144 Truitt 2006, 128, 1847). New experiments chemistry is very sensitive presence of water. Isobutane rate...
The authors show that high-permeability magnetic flux concentrators, which collect from a larger area and concentrate it into the diamond sensor, can be used to improve sensitivity of magnetometers sub-picotesla level using 0.2 W laser power.
The robust synthetic flexibility of metal-organic frameworks (MOFs) offers a promising class tailorable materials, for which the ability to tune specific physicochemical properties is highly desired. This achievable only through thorough description consequences chemical manipulations both in structure and dynamics. Magic angle spinning solid-state NMR spectroscopy many modalities this pursuit, particularly dynamic studies. Herein, we employ separated-local-field approach show how...
Polyvinyl chloride (PVC) is ubiquitous in everyday life; however, it not recycled because degrades uncontrollably into toxic products above 250°C. Therefore, of interest to controllably dechlorinate PVC at mild temperatures generate narrowly distributed carbon materials. We present a catalytic route (~90% reduction Cl content) temperature (200°C) produce gas H
Superparamagnetic iron-oxide nanoparticles (SPIONs) are promising probes for biomedical imaging, but the heterogeneity of their magnetic properties is difficult to characterize with existing methods. Here, we perform wide-field imaging stray fields produced by hundreds isolated ∼30 nm SPIONs using a microscope based on nitrogen-vacancy centers in diamond. By analyzing SPION field patterns as function applied field, observe substantial field-dependent transverse magnetization components that...
Thermally driven transitions between ferromagnetic and paramagnetic phases are characterized by critical behavior with divergent susceptibilities, long-range correlations, spin dynamics that can span kHz to GHz scales as the material approaches temperature Tc, but it has proven technically challenging probe relevant length time most conventional measurement techniques. In this study, we employ scanning nitrogen-vacancy center based magnetometry relaxometry reveal of a high-Tc oxide near its...
Traditional chemical recycling approaches for condensation polymers suffer compounding energy losses and CO2 emissions across multiple polymerization depolymerization cycles. Entropic can address these by entrapping free within the deconstruction products. involves to macrocyclic monomers, but such processes have not been feasible due high dilutions typically required generate compounds. Here, we leverage selective catalysis allow entropic at concentrations 20–2000× higher than typical...
The weak welding strength between filament layers in fused deposition modeling (FDM) products results anisotropic mechanical properties that are also sensitive to print patterns. Furthermore, poor transverse directional alignment coupled with slow printing rates limit their applicability for industrial production. We hypothesize interfilamentous can be enhanced by modifying the chemistry of building blocks and topological arrangement macromolecular structure. To test this, we carried out...
The enzymatic hydrolysis of polyamides offers a promising approach to reduce the environmental impact chemical recycling by enabling lower reaction temperatures, eliminating toxic organic solvents, and enhancing product selectivity....
An aluminum (Al)-based electrocoagulation (EC) system can effectively remove dissolved silica and hardness in groundwater. The effectiveness of Al-EC terms pollutant removal, Faradaic efficiency, energy consumption depends on the interfacial electrolysis or passivation electrode water. Thus, understanding reaction at liquid/electrode interface during operation is important for sustainable EC deployment. A continuous flow-through was tested with various groundwater simulants, i.e., chloride...
Stable aqueous fullerene colloidal suspensions (nC60) are demonstrated to rely on the [6,6]-closed epoxide derivative of (C60O) for stability. This is present, though often unrecognized, in small quantities nearly all C60 starting materials due a reaction with air. The low-yield formation nC60 from organic solvent solutions results preferential partitioning and thus enrichment C60O particles. significantly retarded synthesis method that does not involve solutions: long-term stirring water....
Targeted α therapy (TAT) of soft-tissue cancers using the particle-emitting radionuclide 223Ra holds great potential because its favorable nuclear properties, adequate availability, and established clinical use for treating metastatic prostate cancer bone. Despite these advantages, has been largely overshadowed by other emitters due to challenging chelation chemistry. A key criterion that needs be met a used in TAT is stable attachment targeting vector via bifunctional chelator. The low...