A5023251350- Metal-Organic Frameworks: Synthesis and Applications
- Stress Responses and Cortisol
- Neuroscience and Neuropharmacology Research
- Memory and Neural Mechanisms
- Machine Learning in Materials Science
- Graphene research and applications
- Carbon Nanotubes in Composites
- Crystallography and molecular interactions
- Nanopore and Nanochannel Transport Studies
- Covalent Organic Framework Applications
- Supercapacitor Materials and Fabrication
- Molecular Junctions and Nanostructures
- Perovskite Materials and Applications
- Conducting polymers and applications
- Neurotransmitter Receptor Influence on Behavior
- Inorganic Chemistry and Materials
- X-ray Diffraction in Crystallography
- Adipose Tissue and Metabolism
- Sulfur Compounds in Biology
- Meta-analysis and systematic reviews
- Magnetism in coordination complexes
- Organic Electronics and Photovoltaics
- Zeolite Catalysis and Synthesis
- Force Microscopy Techniques and Applications
- Computational Drug Discovery Methods
University of Colorado Denver
2022-2024
University of Alabama
2021
Georgia Institute of Technology
2016-2019
Massachusetts Institute of Technology
2013-2014
University of Pennsylvania
2011
Acid gases such as SO2 and CO2 are present in many environments which the use of nanoporous metal–organic frameworks (MOFs) is envisaged. Among frameworks, zeolitic imidazolate (ZIFs) have been extensively explored membranes or adsorbents. However, there little systematic knowledge effects acid gas exposure on structure ZIFs, particular mechanistic aspects ZIF degradation by well crystal topology linker composition their stability. Here we a generalized quantitative investigation kinetic...
We propose a kinetic model that describes the separation of single-chirality semiconducting carbon nanotubes based on chirality-selective adsorption to specific hydrogels. Experimental elution profiles (7,3), (6,4), (6,5), (8,3), (8,6), (7,5), and (7,6) species are well described by an irreversible, first-order site association with single rate constant describing each SWNT immobile gel phase. Specifically, we find binding constants for seven experimentally separated normalized molarity...
Significance A key goal of much chemistry and materials research is the creation new chemicals or materials. Understanding how readily synthesis a material can be repeated gives important insight into adopted by technical community used in practical applications. Surprisingly, little known about often gets repeated. In this paper, an extensive analysis published literature for specific class materials, metal-organic frameworks, to quantitatively address issue.
The use of nanoporous zeolitic imidazolate frameworks (ZIFs) in separation processes is attractive, but the presence acid gases such as SOx or NOx process streams can have detrimental effects. While we recently developed a mechanistic picture SOx–ZIF interactions, here describe remarkably different effects NO2 on ZIFs. ZIFs with representative range stabilities are all unstable—as defined by loss crystallinity and porosity—in dry humid NO2, whereas most stable some even SOx. A detailed...
Recently, several important advances in techniques for the separation of single-walled carbon nanotubes (SWNTs) by chiral index have been developed. These new methods allow SWNTs through selective adsorption and desorption different (n,m) indices to from a specific hydrogel. Our group has previously developed kinetic model elution order separation; however, underlying mechanism that allows this remains unknown. In work, we develop quantitative theory provides first mechanistic insights...
Isolated defects induced by water and acid gases have been extensively characterized in ZIF-8, a prototypical metal–organic framework material, but there is little understanding regarding how these single bond-breaking events lead to the structural amorphization observed after prolonged experimental exposure acidic environments. We use density functional theory calculations provide first analysis of defect propagation zeolitic imidazolate (ZIF) material. Given event (the step formation any...
Degradation of metal–organic frameworks (MOFs) in aqueous, humid, and acid gas environments likely begins at defect sites. Until now, however, theoretical studies MOFs have widely assumed an ideal defect-free structure. Here we present a computational model for low-energy extended defects bulk zeolitic imidazolate (ZIFs) that are analogous to stacking faults zeolites. We demonstrate the thermodynamic accessibility ZIFs examine impact these on pore diffusion accessible surface area. identify...
Abstract Systemic manipulations that enhance dopamine (DA) transmission around the time of fear extinction can strengthen and reduce conditioned relapse. Prior studies investigating brain regions where DA augments focus on targets mesolimbic mesocortical systems originating in ventral tegmental area, given role these neurons prediction error. The dorsal striatum (DS), a primary target nigrostriatal system substantia nigra (SN), is implicated behaviors beyond its canonical movement, such as...
A synthesis method to obtain new zeolite imidazolate framework (ZIF) materials that are otherwise difficult synthesize by known techniques such as direct crystallization or solvent-assisted linker exchange, is demonstrated. Treatment of an easily synthesized "template" ZIF (such ZIF-8) with acid gas (humid SO2) allows controlled demolition metal-linker coordination bonds, while preserving overall crystal topology. The partially demolished crystals then reconstructed into highly crystalline...
Perovskite solar cells (PVSC) have drawn increasing attention due to their high photovoltaic performance and low-cost fabrication with solution processability. A variety of methods been developed make uniform dense perovskite thin films, which play a critical role on device performance. Herein, we demonstrate polymer additive assisted approach Polyamidoamine (PAMAM) dendrimers facilitate the growth uniform, dense, ultra-smooth films. Furthermore, lamp annealing has rapidly anneal films using...
A novel magnetic composition of the high surface area particles with amide chemical functionality, Sephacryl S‐200, is reported enabling preparative‐scale (1 L, ≈5–10 mg) separation metallic and semiconducting single‐walled carbon nanotubes (SWNT) from completely unpurified uncentrifuged nanotube stocks. S‐200 has previously been utilized in separating SWNT (s‐SWNT) on laboratory scale. Significantly, use these derivative absorptive allows unprecedented industrially scalable purification...
Single molecule tunnel junctions (SMTJs) can provide important physical insights into electronic and vibrational phenomena at the molecular scale. However, observations analysis are typically confined to sufficiently low temperatures as suppress motion resulting stochastic fluctuations in tunneling current. In this work, we introduce experimentally validate a methodology whereby slightly higher temperature (9 K) compared typical SMTJ study be used induce sparse inelastic current fingerprints...
Abstract Elevated ovarian hormones during fear extinction can enhance memory retention and reduce renewal, but the mechanisms remain unknown. Ovarian modulate dopamine (DA) transmission, a key player in extinction. In males, stimulation of substantia nigra (SN) DA neurons reduces renewal; an effect mimicked by D1 receptor agonist into dorsolateral striatum (DLS). The current studies tested role SN-DLS pathway estrous cycle-modulation relapse. cycling female, Long-Evans rats, proestrus or...