A5048320812- X-ray Diffraction in Crystallography
- Advanced NMR Techniques and Applications
- Crystallization and Solubility Studies
- Metal-Organic Frameworks: Synthesis and Applications
- NMR spectroscopy and applications
- Covalent Organic Framework Applications
- Lipid Membrane Structure and Behavior
- Advanced Battery Materials and Technologies
- Advanced MRI Techniques and Applications
- Cellular transport and secretion
- Silk-based biomaterials and applications
- Calcium signaling and nucleotide metabolism
- Carbon Dioxide Capture Technologies
- Advanced battery technologies research
- Magnetism in coordination complexes
- Electrospun Nanofibers in Biomedical Applications
- Membrane Separation and Gas Transport
- Drug Solubulity and Delivery Systems
- Catalytic Processes in Materials Science
- Membrane-based Ion Separation Techniques
- Protein purification and stability
- Advancements in Battery Materials
- Advanced Drug Delivery Systems
- Insect Utilization and Effects
- Zeolite Catalysis and Synthesis
Rutgers, The State University of New Jersey
2021-2025
Oregon State University
2024
ETH Zurich
2021
Kavli Energy NanoScience Institute
2016-2019
University of California, Berkeley
2016-2019
Lawrence Berkeley National Laboratory
2016-2019
Arizona State University
2014-2016
Sandia National Laboratories
2016
Tempe Union High School District
2014
The imine linkages of two layered, porous covalent organic frameworks (COFs), TPB-TP-COF ([C6H3(C6H4N)3]2[C6H4(CH)2]3, 1) and 4PE-1P-COF ([C2(C6H4N)4][C6H4(CH)2]2, 2), have been transformed into amide to make the respective isostructural COFs 1′ 2′ by direct oxidation with retention crystallinity permanent porosity. Remarkably, both is complete, as assessed FT-IR 13C CP-MAS NMR spectroscopy demonstrates (a) first chemical conversion a COF linkage (b) how usual "crystallization problem"...
The use of two primary alkylamine functionalities covalently tethered to the linkers IRMOF-74-III results in a material that can uptake CO2 at low pressures through chemisorption mechanism. In contrast other amine-functionalized solid adsorbents primarily as ammonium carbamates, we observe using state NMR major product for this is carbamic acid. equilibrium reaction products also shifts carbamate when water vapor present; new finding has impact on control chemistry capture MOF materials and...
Herein, we demonstrate the first example of a multistep solid-state organic synthesis, in which new imine-linked two-dimensional covalent framework (COF-170, 1) was transformed through three consecutive postsynthetic modifications into porous, crystalline cyclic carbamate and thiocarbamate-linked frameworks. These linkages are previously unreported inaccessible de novo synthesis. While not altering overall connectivity framework, these chemical transformations induce significant...
Abstract The electrochemical stability window of water is known to vary with the type and concentration dissolved salts. However, underlying influence ions on thermodynamic aqueous solutions has not been fully understood. Here, we investigated electrolytic behaviors electrolytes as a function different ions. Our findings indicate that high ionic potentials, i.e., charge density, promote formation their respective hydration structures, enhancing reactions via an inductive effect, particularly...
Sequence-dependent materials are a class of in which compositionally aperiodic apportionment functional groups leads to properties where the whole performs better than sum parts. Here, we discuss what defines sequence-dependent material, and how concept can be realized crystals extended structures such as metal–organic frameworks.
The development of experimental methodologies that enable investigations biochemistry at high pressure promises to yield significant advances in our understanding life on Earth and its origins. Here, we introduce a method for studying lipid membranes thermodynamic conditions relevant deep sea hydrothermal vents. Using situ magic-angle spinning solid state nuclear magnetic resonance spectroscopy (NMR), measure changes the fluidity model microbial pressures up 28 MPa. We find fluid-phase...
Understanding the factors that affect self-diffusion in isoreticular and multivariate (MTV) MOFs is key to their application drug delivery, separations, heterogeneous catalysis. Here, we measure apparent of solvents saturated within pores large single crystals MOF-5, IRMOF-3 (amino-functionalized MOF-5), 17 MTV-MOF-5/IRMOF-3 materials at various mole fractions. We find coefficient N,N-dimethylformamide (DMF) may be tuned linearly between diffusion coefficients MOF-5 as a function linker...
Abstract The electrochemical stability window of water is known to vary with the type and concentration dissolved salts. However, underlying influence ions on thermodynamic aqueous solutions has not been fully understood. Here, we investigated electrolytic behaviors electrolytes as a function different ions. Our findings indicate that high ionic potentials, i.e., charge density, promote formation their respective hydration structures, enhancing reactions via an inductive effect, particularly...
Insects of the order Embioptera, known as embiopterans, embiids, or webspinners, weave silk fibers together into sheets to make shelters called galleries. In this study, we show that galleries produced by embiopteran Antipaluria urichi exhibit a highly hydrophobic wetting state with high water adhesion macroscopically equivalent rose petal effect. Specifically, have advancing contact angles above 150°, but receding angle approaching 0°. The consist layered fiber bundles single strands spaced...
Spherical rotors are a new paradigm in magic angle spinning (MAS) solid-state nuclear magnetic resonance (NMR).The simple geometry makes smaller diameter spheres and their utilization within narrow-bore NMR probes feasible.Here we report 68 kHz frequency of 2 mm using helium gas outside the magnet demonstrate use KMnO 4 to adjust at 59.3 for MAS NMR.We observe third-order sidebands 55 Mn spectrum clearly showing kHz, with KBr nearly no first-order similar frequency.The stability was ±0.5%...
Cation-modified and robust zirconium-based metal–organic frameworks demonstrate enhanced performance for carbon dioxide capture.
Embiopterans produce silken galleries and sheets using exceptionally fine silk fibers in which they live breed.
Amidst the rapid expansion of electric vehicle industry, need for alternative battery technologies that balance economic viability with sustainability has never been more critical. Here, we report common lithium salts Li2CO3 and Li2SO4 are transformed into cathode active mass in Li-ion batteries by ball milling to form a composite Cu2S. The optimal comprising Li2CO3, Li2SO4, Cu2S, practical loading 12.5-13.0 mg/cm2, demonstrates reversible capacity 247 mAh/g based on total Cu2S salts,...
Phosphatidylinositol phosphates (PIPs) are a family of seven different eukaryotic membrane lipids that have large role in cell viability, despite their minor concentration cellular membranes. PIPs tightly regulate processes, such as growth, metabolism, immunity, and development through direct interactions with partner proteins. Understanding the biophysical properties complex environment is important to understand how selectively protein. Here, we investigate structure dynamics PIP3 lipid...
Precise alignment of the sample's spinning axis is vital for many magic angle solid state NMR experiments. Spherical rotors are a new paradigm NMR, having been demonstrated to spin stably with little risk rotor crash, but like cylindrical rotors, they have previously only utilized mechanical adjustment method set rotation angle. Here we show that by using second gas aperture within stator, spherical rotor's may be precisely pitched about without or motion stator. The 2H MAS sideband...
Abstract. The use of spherical rotors for magic angle spinning offers a number advantages, including improved sample exchange, efficient microwave coupling dynamic nuclear polarization magnetic resonance (NMR) experiments, and, most significantly, high frequency and stable with minimal risk rotor crash. Here we demonstrate the simple retrofitting commercial NMR probe MAS spheres solid-state NMR. We analyze series turbine groove geometries to investigate importance surface performance. Of...
Predicting drug release profiles from polymer microparticles has proven challenging due to the numerous environmental and chemical factors that affect device influence rate of release. By measuring various properties can release, a predictive approach be used select polymers with specific will lead desired profile for application. To illustrate this, library tyrosol-derived poly(ester-arylate)s, poly(amide)s, poly(carbonate)s were evaluate effects physical (crystallinity, water...
To date, the most common method for setting magic angle in spinning (MAS) solid state NMR experiments has been to monitor signal from a quadrupolar nuclide (such as 79 Br KBr) under MAS, then swapping sample of interest.Here we introduce use single crystal sapphire rotors new set while interest.Using both simulations and experiment, show that 27 Al satellite transitions rotor about its crystalline c-axis manifest off five resonances coalesce into three peaks with maximum intensity at...
ABSTRACT Phosphatidylinositol phosphates (PIPs) are a family of seven different eukaryotic membrane lipids that have large role in cell viability, despite their minor concentration cellular membranes. PIPs tightly regulate processes such as growth, metabolism, immunity, and development through direct interactions with partner proteins. Understanding the biophysical properties complex environment is important to understand how selectively protein. Here we investigate structure dynamics PIP3...
The proper placement of gyrotron relative to the magnetic field is necessary for optimal performance. A gyrotron-alignment platform capable independent, precise adjustment in five degrees freedom has been developed. effectiveness this experimentally demonstrated by alignment a 198 GHz used Dynamic Nuclear Polarization.