- Boron Compounds in Chemistry
- Radiopharmaceutical Chemistry and Applications
- Crystallization and Solubility Studies
- Hydrocarbon exploration and reservoir analysis
- Molecular Junctions and Nanostructures
- Enhanced Oil Recovery Techniques
- Luminescence and Fluorescent Materials
- Conducting polymers and applications
- Polymer Surface Interaction Studies
- Supramolecular Chemistry and Complexes
- X-ray Diffraction in Crystallography
- Nuclear Physics and Applications
- Thermal and Kinetic Analysis
- Hydraulic Fracturing and Reservoir Analysis
- Nanofabrication and Lithography Techniques
- Nonlinear Optical Materials Studies
- Advanced Sensor and Energy Harvesting Materials
- Force Microscopy Techniques and Applications
- Organic Electronics and Photovoltaics
- Block Copolymer Self-Assembly
- Boron and Carbon Nanomaterials Research
- Energetic Materials and Combustion
- Advanced Battery Materials and Technologies
- Molecular Sensors and Ion Detection
- Advanced Fluorescence Microscopy Techniques
Purdue University West Lafayette
2020-2025
University of Missouri
2013-2019
Kansas State University
2006-2011
The electrochemical instability of ether-based electrolyte solutions hinders their practical applications in high-voltage Li metal batteries. To circumvent this issue, here, we propose a dilution strategy to lose the Li+/solvent interaction and use dilute non-aqueous solution lithium We demonstrate that non-polar dipropyl ether (DPE)-based with bis(fluorosulfonyl) imide salt, decomposition order solvated species can be adjusted promote Li+/salt-derived anion clusters over free solvent...
Abstract Substituted 1,3,5-triazines for hydrogen sulfide (H2S) scavenging have established themselves as reliable and economical solutions in the oil gas industry. Aqueous MEA-triazine is most used, non-regenerative scavenger industry, its resulting reaction product, MEA-dithiazine, a ubiquitous well-studied molecule. However, despite storied history H2S scavenger, only recently were two reported crystalline polymorphic forms I II of MEA-dithiazine identified structurally compared....
The quantitative assessment of single molecule diffusion trajectories by orthogonal regression analysis is reported. This broadly applicable to any particle tracking experiments in which along one dimension (1D) expected. It affords data on the (in plane) orientation 1D trajectories, allowing for their absolute orientations be determined. Histograms depicting distribution trajectory angles provide new physical insights into degree alignment, and inference, materials order. Estimates errors...
As a continuation of work on metallacarborane-based molecular motors, the structures substituted bis(dicarbollyl)nickel complexes in NiIII and NiIV oxidation states were investigated solution by fluorescence spectroscopy. Symmetrically positioned cage-linked pyrene molecules served as fluorescent probes to enable observation mixed meso-trans/dl-gauche (pyrene monomer fluorescence) dl-cis/dl-gauche (intramolecular excimer with residual cage conformations nickelacarboranes states,...
Boron neutron capture therapy (BNCT) was performed at the University of Missouri Research Reactor in mice bearing CT26 colon carcinoma flank tumors and results were compared with previously studies EMT6 breast cancer tumors. Mice implanted subcutaneously caudal given two separate tail vein injections unilamellar liposomes composed cholesterol, 1,2-distearoyl-sn-glycer-3-phosphocholine, K[nido-7-CH3(CH2)15-7,8-C2B9H11] lipid bilayer encapsulated Na3[1-(2`-B10H9)-2-NH3B10H8] within liposomal...
Abstract A novel route for synthesis of B‐mercaptocarboranes is described. The reaction proceeds through Pd‐catalyzed iodine exchange with the sulfur nucleophile TIPS–SH in mono‐ and diiodinated ortho ‐, meta para ‐carboranes. Self‐assembled monolayers selected on a gold surface were analyzed by X‐ray photoelectron spectroscopy their water contact angles assessed.
Multiphoton photolithography in poly(methylmethacrylate) films is demonstrated. High-resolution structures of arbitrary geometry with edge sharpnesses as small 120nm are produced using femtosecond pulses 870nm light focused to a diffraction-limited spot the films. The power dependence etching and tests different polymers prove that process nonlinear involves excitation polymer’s chromophores. Atomic force microscopy images show vast majority polymer removed during etching. It concluded...
Composite nanofibrous thin films of a cationic, water-soluble perylene diimide and oppositely charged polyelectrolyte are prepared by sequential deposition from separate aqueous solutions the two precursors. These materials may find future applications as semiconducting "wires" in organic electronics photovoltaics. A new asymmetrically substituted (designated C11OPDI+) incorporating hydrophobic ether tail is employed their synthesis. Poly(acrylate) used polyelectrolyte. Solution-phase...
The influence of precursor aggregation on materials deposition efficiency, film morphology, and macroscopic in-plane organization is explored for electrostatically self-assembled perylene-diimide/polyelectrolyte (PDI/PE) composites. PDI/PE thin films are prepared from aqueous solutions by sequential dip-coating methods. Three PDI dyes employed to probe the electrostatic self-assembly (ESA) These include a singly charged PDI, C(7)OPDI(+), two doubly species, PDISO(3)(2-) TAPDI(2+)....
Sequential deposition of nanofibrous composites charged perylene diimide (PDI) dyes and oppositely polyelectrolyte (PE) is demonstrated within fluidic devices. The PDIs employed include an amphiphilic, singly PDI (C(7)OPDI(+)) a doubly species (TAPDI(2+)). Anionic poly(acrylate) (PA(-), 5100 250K MW) used as the PE. As previously [Weitzel, C. R.; Everett, T. A.; Higgins, D. A. Langmuir, 2009, 25, 1188], dip-coated PDI/PE form films that exhibit flow-induced alignment due to gravitational...
Two approaches for the synthesis of rodlike polymers having metal bis(dicarbollide) anions connected by organic linkers, such as acetylene and 1,4-dibutyl-2,5-diethynylbenzene, in backbone are reported. Route 1 involved connecting nido-bis(carborane) compounds, containing via π coordination with Co or Ni metals. This reaction yielded small oligomers one to six repeating units. 2 utilized a palladium-catalyzed cross-coupling copolymerization diiodo-substituted cobaltocarboranes...
The interest in the incorporation of polyhedral boranes into hybrid molecules has increased tremendously. Most those efforts have focused on use carboranes, as opposed to their all‐boron counterparts, borane anions. Our paved way for synthesis and application several inorganic‐organic nanomolecular scaffolds derived from closo ‐dodecaborate ions [B 12 H ] 2– high payload carriers drugs imaging agents. Herein we report a significant expansion scope these interesting class molecules. A...
Chemical enhanced oil recovery aims to increase the of mature fields. The interfacial tensions (IFTs) between aqueous solution, phase, and other possible phases are important for designing estimating a chemical formulation effectiveness. Ultralow (<10–2 mN·m–1) IFTs needed capillary number help mobilize trapped droplets. Five types equilibrium (EIFTs) have been defined as follows: (I) un-pre-equilibrated IFT; (II) EIFTs in presence rock; (III) pre-equilibrated oil; (IV) EIFT rock (V)...
Extensively developed hydrocarbon reservoirs within the Illinois Basin will soon reach end of their production history without technological intervention. Although many these mature fields have been waterflooded for decades and show significant declines, substantial amounts residual oil remain in place, making them ideal candidates enhanced recovery (EOR). This research focuses mainly on a producing field southern Indiana that is being considered as pilot study surfactant–polymer chemical...
The cover picture shows a novel route for synthesis of 3-SH-1,2-dicarba-closo-dodecaborane. reaction proceeds through Pd-catalyzed iodine exchange with the sulfur nucleophile TIPS–SH in ortho-carborane. presented method makes available previously inaccessible mono- and di-B-mercaptocarboranes from iodocarboranes. thiolated borane clusters can be applied thiol-based self-assembled monolayers (SAMs) on surfaces such as gold. properties SAMs finely tuned by choice carborane isomer position...
Abstract Invited for the cover of this issue is group M. Frederick Hawthorne at University Missouri. The image shows a novel route synthesis 3‐SH‐1,2‐dicarba‐ closo ‐dodecaborane through Pd‐catalyzed iodine exchange with sulfur nucleophile TIPS?SH in ortho ‐carborane. thiolated borane clusters can be applied thiol‐based self‐assembled monolayers (SAMs) on surfaces such as gold.
Abstract The operational production of crude oil inevitably involves the co-production unwanted materials that must be resolved, e.g., produced brine, solids, gases, hydrogen sulfide, etc. Hydrogen sulfide is a particularly noxious and hazardous gas often encountered in production, various methods, including chemical, engineering, or combinations thereof, have been developed to address challenge. Despite longevity H2S scavenging problem, practical economical solutions for treating are still...