A5033299992- Covalent Organic Framework Applications
- Metal-Organic Frameworks: Synthesis and Applications
- Luminescence and Fluorescent Materials
- nanoparticles nucleation surface interactions
- Advanced Optical Network Technologies
- Advanced Photonic Communication Systems
- Optical Network Technologies
- Crystallization and Solubility Studies
- Phase Equilibria and Thermodynamics
- Supramolecular Chemistry and Complexes
- Calcium Carbonate Crystallization and Inhibition
- Mineralogy and Gemology Studies
- Solidification and crystal growth phenomena
- Leprosy Research and Treatment
- Supramolecular Self-Assembly in Materials
- Nanoparticle-Based Drug Delivery
- Bone Tissue Engineering Materials
- Molecular Junctions and Nanostructures
- Software-Defined Networks and 5G
- Micro and Nano Robotics
- Security and Verification in Computing
- Polymer Surface Interaction Studies
- ZnO doping and properties
- Distributed systems and fault tolerance
- Nanocluster Synthesis and Applications
New York University Abu Dhabi
2016-2025
New York University
2016-2025
The Ohio State University
2001-2016
Carestream (United States)
1981-2006
Kodak (United States)
1981-2006
Amazon (Germany)
2006
Oak Ridge National Laboratory
2003
Southern Illinois University School of Medicine
2001
Foundation for Medical Research
1984-1988
Morphology influences the functionality of covalent organic networks and determines potential applications. Here, we report for first time use Zincke reaction to fabricate, under either solvothermal or microwave conditions, a viologen-linked network in form hollow particles nanosheets. The synthesized materials are stable acidic, neutral, basic aqueous solutions. Under neutral assumes radical cationic character without decomposing changing structure. Solvent polarity heating method determine...
A bowl-shaped calix[4]arene with its exciting host–guest chemistry is a versatile supramolecular building block for the synthesis of distinct coordination cages or metal–organic frameworks. However, utility in crystalline covalent organic frameworks (COFs) remains challenging, presumably due to conformational flexibility. Here, we report periodic 2D extended network calix[4]arenes joined by linear benzidine linker via dynamic imine bonds. By tuning interaction among neighboring calixarene...
Abstract Ionic covalent organic frameworks (iCOFs) are new examples of porous materials and have shown great potential for various applications. When functionalized with suitable emission sites, guest uptake via the ionic moieties iCOFs can cause a significant change in luminescence, making them excellent candidates chemosensors. In here, we present luminescence sensor form an framework (TGH + •PD) composed guanidinium phenanthroline detection ammonia primary aliphatic amines. TGH •PD...
Abstract Controlling the number of molecular switches and their relative positioning within porous materials is critical to functionality properties. The proximity many one another can hinder or completely suppress response. Herein, a synthetic strategy involving mixed linkers used control distribution spiropyran-functionalized in covalent organic framework (COF). COF contains spiropyran each pore which exhibits excellent reversible photoswitching behavior its merocyanine form solid state...
Nanoscale imine-linked covalent organic frameworks (nCOFs) were first loaded with the anticancer drug Doxorubicin (Dox), coated magnetic iron oxide nanoparticles (γ-Fe2O3 NPs), and stabilized a shell of poly(l-lysine) cationic polymer (PLL) for simultaneous synergistic thermo-chemotherapy treatment MRI imaging. The pH responsivity resulting nanoagents (γ-SD/PLL) allowed release selectively within acidic microenvironment late endosomes lysosomes cancer cells (pH 5.4) not in physiological...
Light-operated materials have gained significant attention for their potential technological importance. To achieve molecular motion within extended networks, stimuli-responsive units require free space. The majority of the so far reported 2D-extended organic networks with responsive moieties restrict freedom on account connectivity providing constrained volume efficient motion. We report here a light-responsive azobenzene-functionalized covalent framework (TTA-AzoDFP) designed in way that...
Non-toxic covalent organic nanosheet-based fluorescent nuclear stains.
With diabetes being the 7th leading cause of death worldwide, overcoming issues limiting oral administration insulin is global significance. The development imine-linked-covalent organic framework (nCOF) nanoparticles for delivery to overcome these barriers herein reported. A gastro-resistant nCOF was prepared from layered nanosheets with loaded between nanosheet layers. insulin-loaded exhibited protection in digestive fluids
Oils and bioproducts extracted from cultivated algae can be used as sustainable feedstock for fuels, nutritional supplements, other bio-based products. Discovery isolation of new algal species their subsequent optimization are needed to achieve economical feasibility industrial applications. Here we describe validate a workflow in situ analysis lipids through confocal Raman microscopy. We demonstrate its effectiveness characterize lipid content strains isolated the environment well cells...
Abstract Visual sensing of humidity and temperature by solids plays an important role in the everyday life industrial processes. Due to their hydrophobic nature, most covalent organic framework (COF) sensors often exhibit poor optical response when exposed moisture. To overcome this challenge, is set out improve, moisture incorporating H‐bonding ionic functionalities into COF network. A highly sensitive COF, consisting guanidinium diformylpyridine linkers (TG‐DFP), capable detecting changes...
Abstract Owing to their chemical and thermal stabilities, high uptake capacities, easy recyclability, covalent organic polymers (COPs) have shown promise as pollutant sponges. Herein, we describe the use of diazo coupling synthesize two cationic COPs, COP1 ++ COP2 , that incorporate a viologen‐based molecular switch an macrocycle, calix[4]arene. The COPs form nanosheets height profiles 6.00 nm 8.00 nm, respectively, based on AFM measurements. sheets remain morphologically intact upon one‐ or...
Membrane technology plays a central role in advancing separation processes, particularly water treatment. Covalent organic frameworks (COFs) have transformative potential this field due to their adjustable structures and robustness. However, conventional COF membrane synthesis methods are often associated with challenges, such as time-consuming processes limited control over surface properties. Our study demonstrates rapid, microwave-assisted method synthesize self-standing membranes within...
Cryosurgery represents a transformative approach in the treatment of resistant tumors, utilizing extreme cold to selectively ablate malignant tissue. However, clinical success this technique is constrained by limited ability current imaging techniques differentiate effectively between cancerous and healthy tissues with high spatial resolution. To overcome challenge, we present nanoscale Covalent Organic Framework, nTG-DFP-COF, specifically designed enhance fluorescence-guided cryo-imaging....
Calixarenes are a common motif in supramolecular chemistry but have rarely been incorporated structurally well-defined covalent 2D materials. Such task is challenging, especially without template, because of the nonplanar configuration and conformational flexibility calixarene ring. Here, we report first-of-a-kind solvothermal synthesis calix[4]arene-based polymer (CX4-NS) that porous, covalent, isolated as few-layer thick (3.52 nm) nanosheets. Experimental theoretical characterization...
Abstract Since their initial presentation in 2005 by Yaghi and co-workers, covalent organic frameworks (COFs) have been the focus of much development. Here we introduce mechanical bonds into COFs employing a method that involves supramolecular self-assembly, dynamic imine-bond formation, liquid-liquid interfacial condensation produces continuous 2D polyrotaxaneted film. A diamino-viologen linker is complexed with macrocycle cucurbit[7]uril (CB[7]) to form pseudorotaxanes then condense an...
Hierarchically porous CaCO3 scaffolds comprised of micro- (diameter = 2.0 ± 0.3 μm) and nano-sized 50.4 14.4 nm) pores were fabricated on silicon substrates using a supercritical CO2-based process. Differentiated human THP-1 monocytes exposed to the produced negligible levels inflammatory cytokine tumor necrosis factor-alpha (TNF-α), confirming lack immunogenicity scaffolds. Extracellular matrix (ECM) proteins, vitronectin fibronectin, displayed enhanced adsorption compared controls. ECM...
The design of survivable all-optical networks based on self-healing WDM rings (SHR/WDM) to provide 100% protection from any single link failure requires the joint solution three sub-problems. These are ring cover mesh topology (the RC sub-problem), routing working lightpaths between node pairs support traffic demands WL sub-problem) and selection SHR/WDM spare wavelengths for every SW subproblem). This paper presents an integer linear programming (ILP) formulation problem minimizing total...
The strong tendency of organic nanoparticles to rapidly self-assemble into highly aligned superlattices at room temperature when solution-cast from dispersions or spray-coated directly onto various substrates is described. nanoparticle are stable for years. novel precipitation process used believed result in molecular distances and alignments the that not normally possible. Functional light-emitting diodes (OLEDs)—which have same host–dopant emissive-material composition—with process-tunable...
The anisotropic growth of twinned platelets having a cubic crystal structure is examined by ball-model simulation the process. has suggested that long-accepted mechanism, which relies on self-regenerating {111} faceted-side-face structure, may need revision. Such side-face likely to transform into different where twin bands are bound {100} planes. Experimental evidence presented support this for silver halide system.
Abstract Adjustment of the morphology covalent organic nanomaterials is a challenge but can be achieved by perturbing planarity monomers used as core moieties in these polymers. Here we describe template‐free Zincke reaction for synthesis nanosheets ( CONs ) that stack several layers thick and tubes COTs ). Both materials contain same viologen linker different pyrene‐based cores. polymeric are nanoporous, cationic, highly stable water, even presence acid (1 M HCl) or base NaOH). Their...
Accidental oil spills have released millions of barrels petroleum hydrocarbons in oceans worldwide, causing severe damage to marine and coastal ecosystems. Materials clean up these are therefore high demand. Here, we report the rapid, scalable microwave-assisted synthesis two isostructural imine-linked covalent organic frameworks (COFs; TAB-DFP TAB-MPPD) from 2,6-diformylpyridine (DFP) or 4-(4-(methylthio)phenyl) pyridine-2,6-dicarbaldehyde (MPPD) tris(4-aminophenyl) benzene (TAB) building...
We report a versatile method for the fabrication of nanowires and hierarchical porous materials from wide variety ceramic such as CaCO3, ZnO, CuO, Co3O4, Co-doped Ag2O. The consists evaporation CO2-enriched water microdroplets (diameter ∼3 μm) deposited an aerosol onto heated substrates (T = 120 °C). A scaffolds with 1-3 μm sized pores can be generated by tuning process conditions. Subsequent sintering is shown to generate nanosized in walls scaffold creating dual hierarchy pore sizes (∼50...