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Articles 1 - 25 of 25
Full-Text Articles in Entire DC Network
Photochemical And Photophysical Dynamics Of The Aqueous Ferrate(Vi) Ion, Cali Antolini, Charles D. Spellman, Christopher J. Otolski, Gilles Doumy, Anne Marie March, Donald A. Walko, Cunming Liu, Xiaoyi Zhang, Benjamin T. Young, Joseph E. Goodwill, Dugan Hayes
Photochemical And Photophysical Dynamics Of The Aqueous Ferrate(Vi) Ion, Cali Antolini, Charles D. Spellman, Christopher J. Otolski, Gilles Doumy, Anne Marie March, Donald A. Walko, Cunming Liu, Xiaoyi Zhang, Benjamin T. Young, Joseph E. Goodwill, Dugan Hayes
Chemistry Faculty Publications
Ferrate(VI) has the potential to play a key role in future water supplies. Its salts have been suggested as "green" alternatives to current advanced oxidation and disinfection methods in water treatment, especially when combined with ultraviolet light to stimulate generation of highly oxidizing Fe(V) and Fe(IV) species. However, the nature of these intermediates, the mechanisms by which they form, and their roles in downstream oxidation reactions remain unclear. Here, we use a combination of optical and X-ray transient absorption spectroscopies to study the formation, interconversion, and relaxation of several excited-state and metastable high-valent iron species following excitation of aqueous potassium …
Rapid Detection Of Recurrent Non-Muscle Invasive Bladder Cancer In Urine Using Atr-Ftir Technology, Abdullah I. El-Falouji, Dalia M. Sabri, Naira M. Lofti, Doaa M. Medany, Samar A. Mohamed, Mai Alaa-Eldin, Amr Mounir Selim, Asmaa A. El Leithy, Haitham F. Kalil, Ahmed El-Tobgy, Ahmed Mohamed
Rapid Detection Of Recurrent Non-Muscle Invasive Bladder Cancer In Urine Using Atr-Ftir Technology, Abdullah I. El-Falouji, Dalia M. Sabri, Naira M. Lofti, Doaa M. Medany, Samar A. Mohamed, Mai Alaa-Eldin, Amr Mounir Selim, Asmaa A. El Leithy, Haitham F. Kalil, Ahmed El-Tobgy, Ahmed Mohamed
Chemistry Faculty Publications
Non-muscle Invasive Bladder Cancer (NMIBC) accounts for 80% of all bladder cancers. Although it is mostly low-grade tumors, its high recurrence rate necessitates three-times-monthly follow-ups and cystoscopy examinations to detect and prevent its progression. A rapid liquid biopsy-based assay is needed to improve detection and reduce complications from invasive cystoscopy. Here, we present a rapid spectroscopic method to detect the recurrence of NMIBC in urine. Urine samples from previously-diagnosed NMIBC patients (n = 62) were collected during their follow-up visits before cystoscopy examination. Cystoscopy results were recorded (41 cancer-free and 21 recurrence) and attenuated total refraction Fourier transform infrared (ATR-FTIR) …
Are We Building Back Better?, Fabian M. Dayrit
Are We Building Back Better?, Fabian M. Dayrit
Chemistry Faculty Publications
No abstract provided.
Uv To Nir Down-Shifting In Yb3+-Doped Phosphate Glass Via Divalent Tin Centers, José A. Jiménez, Dugan Hayes, Carson Hasselbrink
Uv To Nir Down-Shifting In Yb3+-Doped Phosphate Glass Via Divalent Tin Centers, José A. Jiménez, Dugan Hayes, Carson Hasselbrink
Chemistry Faculty Publications
The conversion of ultraviolet (UV) to near-infrared (NIR) photons is demonstrated for the first time in Yb3+-containing glass via Sn2+. Glasses with barium phosphate matrix were prepared by melt-quenching adding 2 mol % Yb2O3 alongside SnO up to 10 mol %. The investigation encompassed X-ray diffraction (XRD), UV-vis-NIR absorption, 119Sn Mössbauer spectroscopy, and photoluminescence (PL) spectroscopy measurements with emission dynamics assessment. XRD data showed that the amorphous nature of the glasses is maintained within the range of dopant concentrations considered, while the optical absorption, 119Sn Mössbauer, and PL data supported the …
Nucleobase-Modified Nucleosides And Nucleotides: Applications In Biochemistry, Synthetic Biology, And Drug Discovery, Anthony J. Berdis
Nucleobase-Modified Nucleosides And Nucleotides: Applications In Biochemistry, Synthetic Biology, And Drug Discovery, Anthony J. Berdis
Chemistry Faculty Publications
DNA is often referred to as the "molecule of life " since it contains the genetic blueprint for all forms of life on this planet. The core building blocks composing DNA are deoxynucleotides. While the deoxyribose sugar and phosphate group are ubiquitous, it is the composition and spatial arrangement of the four natural nucleobases, adenine (A), cytosine (C), guanine (G), and thymine (T), that provide diversity in the coding information present in DNA. The ability of DNA to function as the genetic blueprint has historically been attributed to the formation of proper hydrogen bonding interactions made between complementary nucleobases. However, …
A Novel Ibuprofen Derivative And Its Complexes: Physicochemical Characterization, Dft Modeling, Docking, In Vitro Anti-Inflammatory Studies, And Dna Interaction, Abbas M. Abbas, Ahmed Aboelmagd, Safaa M. Kishk, Hossam H. Nasrallah, W. Christropher Boyd, Haitham F. Kalil, Adel S. Orabi
A Novel Ibuprofen Derivative And Its Complexes: Physicochemical Characterization, Dft Modeling, Docking, In Vitro Anti-Inflammatory Studies, And Dna Interaction, Abbas M. Abbas, Ahmed Aboelmagd, Safaa M. Kishk, Hossam H. Nasrallah, W. Christropher Boyd, Haitham F. Kalil, Adel S. Orabi
Chemistry Faculty Publications
A novel derivative of ibuprofen and salicylaldehyde N '-(4-hydroxybenzylidene)-2-(4-isobutylphenyl) propane hydrazide (HL) was synthesized, followed by its complexation with Cu, Ni, Co, Gd, and Sm. The compounds obtained were characterized by (HNMR)-H-1, mass spectrometry, UV-Vis spectroscopy, FT-IR spectroscopy, thermal analysis (DTA and TGA), conductivity measurements, and magnetic susceptibility measurements. The results indicate that the complexes formed were [Cu(L)(H2O)]Cl center dot 2H(2)O, [Ni(L)(2)], [Co(L)(2)]center dot H2O, [Gd(L)(2)(H2O)(2)](NO3)center dot 2H(2)O and [Sm(L)(2)(H2O)(2)](NO3)center dot 2H(2)O. The surface characteristics of the produced compounds were evaluated by DFT calculations using the MOE environment. The docking was performed against the COX2 targeting protein (PDB code: 5IKT …
Sialidase Inhibitors With Different Mechanisms, Joseph M. Keil, Garrett R. Rafn, Isaac M. Turan, Majdi A. Aljohani, Reza Sahebjam-Atabaki, Xue-Long Sun
Sialidase Inhibitors With Different Mechanisms, Joseph M. Keil, Garrett R. Rafn, Isaac M. Turan, Majdi A. Aljohani, Reza Sahebjam-Atabaki, Xue-Long Sun
Chemistry Faculty Publications
Sialidases, or neuraminidases, are enzymes that catalyze the hydrolysis of sialic acid (Sia)-containing molecules, mostly removal of the terminal Sia (desialylation). By desialylation, sialidase can modulate the functionality of the target compound and is thus often involved in biological pathways. Inhibition of sialidases with inhibitors is an important approach for under-standing sialidase function and the underlying mechanisms and could serve as a therapeutic approach as well. Transition-state analogues, such as anti-influenza drugs oseltamivir and zanamivir, are major sialidase inhibitors. In addition, difluoro-sialic acids were developed as mechanism-based sialidase inhibitors. Further, fluorinated quinone methide-based suicide substrates were reported. Sialidase product analogue …
Ractopamine At The Center Of Decades-Long Scientific And Legal Disputes: A Lesson On Benefits, Safety Issues, And Conflicts, Kumail Abbas, Aqeel Raza, Ross D. Vasquez, Marri Jmelou M. Roldan, Nemi Malhotra, Jong-Chin Huang, Olivia Erin M. Buenafe, Kelvin H. -C Chen, Shin-Shin Liang, Chung-Der Hsiao
Ractopamine At The Center Of Decades-Long Scientific And Legal Disputes: A Lesson On Benefits, Safety Issues, And Conflicts, Kumail Abbas, Aqeel Raza, Ross D. Vasquez, Marri Jmelou M. Roldan, Nemi Malhotra, Jong-Chin Huang, Olivia Erin M. Buenafe, Kelvin H. -C Chen, Shin-Shin Liang, Chung-Der Hsiao
Chemistry Faculty Publications
Ractopamine (RAC) is a synthetic phenethanolamine, β–adrenergic agonist used as a feed additive to develop leanness and increase feed conversion efficiency in different farm animals. While RAC has been authorized as a feed additive for pigs and cattle in a limited number of countries, a great majority of jurisdictions, including the European Union (EU), China, Russia, and Taiwan, have banned its use on safety grounds. RAC has been under long scientific and political discussion as a controversial antibiotic as a feed additive. Here, we will present significant information on RAC regarding its application, detection methods, conflicts, and legal divisions that …
Direct Ink 3d Printing Of Porous Carbon Monoliths For Gas Separations, Marisa L. Comroe, Kurt W. Kolasinski, Dipendu Saha
Direct Ink 3d Printing Of Porous Carbon Monoliths For Gas Separations, Marisa L. Comroe, Kurt W. Kolasinski, Dipendu Saha
Chemistry Faculty Publications
Additive manufacturing or 3D printing is the advanced method of manufacturing monolithic adsorbent materials. Unlike beads or pellets, 3D monolithic adsorbents possess the advantages of widespread structural varieties, low heat and mass transfer resistance, and low channeling of fluids. Despite a large volume of research on 3D printing of adsorbents having been reported, such studies on porous carbons are highly limited. In this work, we have reported direct ink 3D printing of porous carbon; the ink consisted of commercial activated carbon, a gel of poly(4-vinylphenol) and Pluronic F127 as plasticizer, and bentonite as the binder. The 3D printing was performed …
Multimodal Cotranslational Interactions Direct Assembly Of The Human Multi-Trna Synthetase Complex, Krishnendu Khan, Briana Long, Valentin Gogonea, Gauravi M. Deshpande, Kommireddy Vasu, Paul L. Fox
Multimodal Cotranslational Interactions Direct Assembly Of The Human Multi-Trna Synthetase Complex, Krishnendu Khan, Briana Long, Valentin Gogonea, Gauravi M. Deshpande, Kommireddy Vasu, Paul L. Fox
Chemistry Faculty Publications
Amino acid ligation to cognate transfer RNAs (tRNAs) is catalyzed by aminoacyl-tRNA synthetases (aaRSs)-essential interpreters of the genetic code during translation. Mammalian cells harbor 20 cytoplasmic aaRSs, out of which 9 (in 8 proteins), with 3 non-aaRS proteins, AIMPs 1 to 3, form the similar to 1.25-MDa multi-tRNA synthetase complex (MSC). The function of MSC remains uncertain, as does its mechanism of assembly. Constituents of multiprotein complexes encounter obstacles during assembly, including inappropriate interactions, topological constraints, premature degradation of unassembled subunits, and suboptimal stoichiometry. To facilitate orderly and efficient complex formation, some complexes are assembled cotranslationally by a mechanism in …
Towards Upcycling Biomass-Derived Crosslinked Polymers With Light, Ravichandranath Singathi, Ramya Raghunathan, Retheesh Krishnan, Saravana Kumar Rajendran, Sruthy Baburaj, Mukund P. Sibi, Dean C. Webster, Jayaraman Sivaguru
Towards Upcycling Biomass-Derived Crosslinked Polymers With Light, Ravichandranath Singathi, Ramya Raghunathan, Retheesh Krishnan, Saravana Kumar Rajendran, Sruthy Baburaj, Mukund P. Sibi, Dean C. Webster, Jayaraman Sivaguru
Chemistry Faculty Publications
Photodegradable, recyclable, and renewable, crosslinked polymers from bioresources show promise towards developing a sustainable strategy to address the issue of plastics degradability and recyclability. Photo processes are not widely exploited for upcycling polymers in spite of the potential to have spatial and temporal control of the degradation in addition to being a green process. In this report we highlight a methodology in which biomass-derived crosslinked polymers can be programmed to degrade at ≈300 nm with ≈60 % recovery of the monomer. The recovered monomer was recycled back to the crosslinked polymer.
Aminoacyl-Trna Synthetases Of The Multi-Trna Synthetase Complex And Their Role In Tumorigenesis, Krishnendu Khan, Valentin Gogonea, Paul L. Fox
Aminoacyl-Trna Synthetases Of The Multi-Trna Synthetase Complex And Their Role In Tumorigenesis, Krishnendu Khan, Valentin Gogonea, Paul L. Fox
Chemistry Faculty Publications
In mammalian cells, 20 aminoacyl-tRNA synthetases (AARS) catalyze the ligation of amino acids to their cognate tRNAs to generate aminoacylated-tRNAs. In higher eukaryotes, 9 of the 20 AARSs, along with 3 auxiliary proteins, join to form the cytoplasmic multi-tRNA synthetase complex (MSC). The complex is absent in prokaryotes, but evolutionary expansion of MSC constituents, primarily by addition of novel interacting domains, facilitates formation of subcomplexes that join to establish the holo-MSC. In some cases, environmental cues direct the release of constituents from the MSC which enables the execution of non-canonical, i.e., "moonlighting", functions distinct from their essential activities in protein …
Synthesis Of A Novel Ras Farnesyl Protein Transferase Inhibitor, Mark F. Mechelke, Anna Mikolchak
Synthesis Of A Novel Ras Farnesyl Protein Transferase Inhibitor, Mark F. Mechelke, Anna Mikolchak
Chemistry Faculty Publications
Mutant RAS proteins are associated with 30% of all human cancers. Unregulated cell growth caused by mutant RAS proteins can be prevented by RAS farnesyl protein transferase (FPTase) inhibitors. A novel FPTase inhibitor has been synthesized incorporating a modified farnesyl “tail” and a customized diphosphate “head”. It is anticipated that the modified “tail”, incorporating a phenyl substituent, will bind more tightly to FPTase due to nonbonding interactions between the aromatic ring and ten aromatic amino acid residues that line the enzyme active site. The altered polar “head”, designed from L-aspartic acid, has already been shown to mimic the natural substrate’s …
Electrolytes Containing Triethyl Phosphate Solubilized Lithium Nitrate For Improved Silicon Anode Performance, Leah Rynearson, Nuwanthi D. Rodrigo, Chamithri Jayawardana, Brett L. Lucht
Electrolytes Containing Triethyl Phosphate Solubilized Lithium Nitrate For Improved Silicon Anode Performance, Leah Rynearson, Nuwanthi D. Rodrigo, Chamithri Jayawardana, Brett L. Lucht
Chemistry Faculty Publications
An electrolyte consisting of lithium nitrate (LiNO3) and lithium difluoro(oxalato)borate (LiDFOB) in ethylene carbonate (EC), ethylmethyl carbonate (EMC), and triethyl phosphate (TEP) is used to improve the long-term cycling stability of silicon anodes. TEP was selected for its ability to dissolve LiNO3 in carbonates to a concentration of ∼0.2 M. The large amount of LiNO3 combined with the LiDFOB salt leads to a capacity retention of 87.1% after one hundred cycles due to the formation of a relatively stable solid electrolyte interphase (SEI). Ex-situ surface analysis reveals that the SEI consists of oxalates, lithium alkyl carbonates, borates, and nitrate reduction …
Characterization Of Mechanochemical Modification Of Porous Silicon With Arginine, Jacklyn A. Dipietro, Kurt W. Kolasinski
Characterization Of Mechanochemical Modification Of Porous Silicon With Arginine, Jacklyn A. Dipietro, Kurt W. Kolasinski
Chemistry Faculty Publications
Mechanochemistry initiated the reaction of hydrogen-terminated porous silicon (H/por-Si) powder with arginine. Samples were analyzed using Fourier-transform infrared spectroscopy (FTIR), dynamic light scattering (DLS), zeta potential, scanning electron microscopy (SEM), and photoluminescence (PL) spectroscopy. Arginine, which was physisorbed onto the surface of por-Si, blue-shifted the peak PL intensity from similar to 630 nm for the H/por-Si to similar to 565 nm for arginine-coated por-Si. Grinding for 4 h reduced >80% of the initially 2-45 mu m particles to <500 nm, but was observed to quench the PL. With appropriate rinsing and centrifugation, particles in the 100 nm range were isolated. Rinsing ground powder with water was required to remove the unreacted arginine. Without rinsing, excess arginine induced the aggregation of passivated particles. However, water reacted with the freshly ground por-Si powder producing H-2. A zeta potential of +42 mV was measured for arginine-terminated por-Si particles dispersed in deionized water. This positive value was consistent with termination such that NH2 groups extended away from the surface. Furthermore, this result was confirmed by FTIR spectra, which suggested that arginine was bound to silicon through the formation of a covalent Si-O bond.
Investigation Of The Electrode-Electrolyte Interphase In Ester-Based Electrolytes In Ncm523/Graphite Cells, Nuwanthi D. Rodrigo, Chamithri Jayawardana, Brett L. Lucht
Investigation Of The Electrode-Electrolyte Interphase In Ester-Based Electrolytes In Ncm523/Graphite Cells, Nuwanthi D. Rodrigo, Chamithri Jayawardana, Brett L. Lucht
Chemistry Faculty Publications
The use of methyl acetate (MA) and methyl propionate (MP) as co-solvents in carbonate/LiPF6 electrolytes have been investigated in LiNi0.5Co0.2Mn0.3O2 (NCM523)/graphite cells to improve electrochemical performance at low temperature (-20 °C). Consistent with previous investigations, improved low temperature performance was observed with all electrolyte formulations containing esters. Detailed ex situ surface analysis of the surface films generated with the ester-based electrolytes containing electrolyte additives reveal significant changes to the SEI on graphite upon cycling at moderately elevated temperature (45 °C). In the presence of vinylene carbonate (VC) lithium plating is observed upon cycling at low temperature (-20 °C) which leads …
Characteristics And Assessing Biological Risks Of Airborne Bacteria In Waste Sorting Plant, Abbas Norouzian Baghani, Somayeh Golbaz, Gholamreza Ebrahimzadeh, Marcelo I. Guzman, Mahdieh Delikhoon, Mehdi Jamshidi Rastani, Abdullah Barkhordari, Ramin Nabizadeh
Characteristics And Assessing Biological Risks Of Airborne Bacteria In Waste Sorting Plant, Abbas Norouzian Baghani, Somayeh Golbaz, Gholamreza Ebrahimzadeh, Marcelo I. Guzman, Mahdieh Delikhoon, Mehdi Jamshidi Rastani, Abdullah Barkhordari, Ramin Nabizadeh
Chemistry Faculty Publications
Examining the concentration and types of airborne bacteria in waste paper and cardboard sorting plants (WPCSP) is an urgent matter to inform policy makers about the health impacts on exposed workers. Herein, we collected 20 samples at 9 points of a WPCSP every 6 winter days, and found that the most abundant airborne bacteria were positively and negatively correlated to relative humidity and temperature, respectively. The most abundant airborne bacteria (in units of CFU m−3) were: Staphylococcus sp. (72.4) > Micrococcus sp. (52.2) > Bacillus sp. (30.3) > Enterococcus sp. (24.0) > Serratia marcescens (20.1) > E. coli (19.1) > Pseudomonas sp. (16.0) > Nocardia …
Network-Based Pharmacology Study Reveals Protein Targets For Medical Benefits And Harms Of Cannabinoids In Humans, Xingyu Li, Amit Madhukar Kudke, Felix Joseph Nepveux V, Yan Xu
Network-Based Pharmacology Study Reveals Protein Targets For Medical Benefits And Harms Of Cannabinoids In Humans, Xingyu Li, Amit Madhukar Kudke, Felix Joseph Nepveux V, Yan Xu
Chemistry Faculty Publications
This network-based pharmacology study intends to uncover the underlying mechanisms of cannabis leading to a therapeutic benefit and the pathogenesis for a wide range of diseases claimed to benefit from or be caused by the use of the cannabis plant. Cannabis contains more than 600 chemical components. Among these components, cannabinoids are well-known to have multifarious pharmacological activities. In this work, twelve cannabinoids were selected as active compounds through text mining and drug-like properties screening and used for initial protein-target prediction. The disease-associated biological functions and pathways were enriched through GO and KEGG databases. Various biological networks [i.e., protein-protein interaction, …
All-Atom Simulations Uncover Structural And Dynamical Properties Of Sting Proteins In The Membrane System, Rachel Payne, Silvia Crivelli, Masakatsu Watanabe Ph.D.
All-Atom Simulations Uncover Structural And Dynamical Properties Of Sting Proteins In The Membrane System, Rachel Payne, Silvia Crivelli, Masakatsu Watanabe Ph.D.
Chemistry Faculty Publications
Recent studies have shown that the stimulator of interferon gene (STING) protein plays a central role in the immune system by facilitating the production of Type I interferons in cells. The STING signaling pathway is also a prominent activator of cancer-killing T cells that initiates a powerful adaptive immune response. Since biomolecular signaling pathways are complicated and not easily identified through traditional experiments, molecular dynamics (MD) has often been used to study these biological pathways’ structural and dynamical responses. Here, we carried out MD simulations for full-length chicken and human STING (chSTING and hSTING) proteins. Specifically, we investigated ligand-bound closed …
Metabolic Features Of Brain Function With Relevance To Clinical Features Of Alzheimer And Parkinson Diseases, David Allan Butterfield, Maria Favia, Iolanda Spera, Annalisa Campanella, Martina Lanza, Alessandra Castegna
Metabolic Features Of Brain Function With Relevance To Clinical Features Of Alzheimer And Parkinson Diseases, David Allan Butterfield, Maria Favia, Iolanda Spera, Annalisa Campanella, Martina Lanza, Alessandra Castegna
Chemistry Faculty Publications
Brain metabolism is comprised in Alzheimer’s disease (AD) and Parkinson’s disease (PD). Since the brain primarily relies on metabolism of glucose, ketone bodies, and amino acids, aspects of these metabolic processes in these disorders—and particularly how these altered metabolic processes are related to oxidative and/or nitrosative stress and the resulting damaged targets—are reviewed in this paper. Greater understanding of the decreased functions in brain metabolism in AD and PD is posited to lead to potentially important therapeutic strategies to address both of these disorders, which cause relatively long-lasting decreased quality of life in patients.
Difluorophosphoric Acid Generation And Crossover Reactions In Linixcoymnzo2 Cathodes Operating At High Voltage, Chamithri Jayawardana, Nuwanthi D. Rodrigo, Leah Rynearson, Brett L. Lucht
Difluorophosphoric Acid Generation And Crossover Reactions In Linixcoymnzo2 Cathodes Operating At High Voltage, Chamithri Jayawardana, Nuwanthi D. Rodrigo, Leah Rynearson, Brett L. Lucht
Chemistry Faculty Publications
Cycling lithiated metal oxides to high potential (>4.5 V vs Li) is of significant interest for the next generation of lithium ion batteries as this significantly increases the capacity and energy of cells. However, cells cycled to high potential suffer from rapid capacity fade due to a combination of thickening of the anode solid electrolyte interphase (SEI) and impedance growth on the cathode. While transition metal catalysed degradation of the anode SEI has been widely proposed as a primary source of capacity loss, a related acid induced degradation of the anode SEI is proposed. A systematic investigation of LiNi …
Performance Improvement Of Lithium Metal Batteries Enabled By Libf3cn As A New Electrolyte Additive, Oh B. Chae, Venkata A. K. Adiraju, Brett L. Lucht
Performance Improvement Of Lithium Metal Batteries Enabled By Libf3cn As A New Electrolyte Additive, Oh B. Chae, Venkata A. K. Adiraju, Brett L. Lucht
Chemistry Faculty Publications
A newly synthesized electrolyte additive, lithium trifluoro(cyano) borate (LiBF3CN), has been investigated for electrochemical performance improvement of lithium metal batteries. The LiBF3CN has a structure where one fluorine atom of BF4− is substituted with a cyano group (−CN) prepared by the reaction of boron trifluoride etherate with lithium cyanide. The electrochemical performance in symmetric Li/Li cells and NCM523/Li cells is significantly improved upon the incorporation of LiBF3CN as an electrolyte additive into a carbonate-based electrolyte. Extensive characterization of the deposited lithium metal reveals that a thin (≈20 nm) and robust SEI composed …
Use Of Ethylene Carbonate Free Ester Solvent Systems With Alternative Lithium Salts For Improved Low-Temperature Performance In Ncm622∣∣ Graphite Li-Ion Batteries, Nuwanthi D. Rodrigo, Chamithri Jayawardana, Leah Rynearson, Enyuan Hu, Xiao-Qing Yang, Brett L. Lucht
Use Of Ethylene Carbonate Free Ester Solvent Systems With Alternative Lithium Salts For Improved Low-Temperature Performance In Ncm622∣∣ Graphite Li-Ion Batteries, Nuwanthi D. Rodrigo, Chamithri Jayawardana, Leah Rynearson, Enyuan Hu, Xiao-Qing Yang, Brett L. Lucht
Chemistry Faculty Publications
An investigation of alternative lithium salts, lithium tetrafluoroborate (LiBF4), lithium difluoro(oxalato)borate (LiDFOB) and lithium hexafluorophosphate (LiPF6), in novel ester-based (methyl acetate/fluoroethylene carbonate- MA/FEC or methyl propionate/fluoroethylene carbonate- MP/FEC) electrolyte formulations has been conducted in LiNi0.6Co0.2Mn0.2O2 (NCM622)/graphite cells to improve low temperature cycling performance of lithium ion batteries at −20 °C. Improved low temperature performance was observed with all the lithium salts in MA/FEC electrolyte while comparable room temperature (25 °C) capacities were observed with LiPF6 salt only. Detailed ex-situ analysis of surface films generated with LiBF4, …
Catalytic Thermal Decomposition Of No2 By Iron(Iii) Nitrate Nonahydrate-Doped Poly(Vinylidene Difluoride), Lasanthi Sumathirathne, Carson Lawrence Hasselbrink, Dugan Hayes, William B. Euler
Catalytic Thermal Decomposition Of No2 By Iron(Iii) Nitrate Nonahydrate-Doped Poly(Vinylidene Difluoride), Lasanthi Sumathirathne, Carson Lawrence Hasselbrink, Dugan Hayes, William B. Euler
Chemistry Faculty Publications
The products of thermal decomposition of iron nitrate nonahydrate doped into poly(vinylidene difluoride) are examined using Mössbauer spectroscopy. Very little of the expected nitrogen dioxide product is observed, which is attributed to Fe3+ catalysis of the decomposition of NO2. The active site of the catalysis is shown to be Fe(OH)3 in the polymer matrix, which is, unexpectedly, reduced to Fe(OH)2. Thermodynamic calculations show that the reduction of Fe3+ is exergonic at sufficiently high temperatures. A reaction sequence, including a catalytic cycle for decomposition of NO2, is proposed that accounts for the …
Synthesis Of Β,Β-Disubstituted Styrenes Via Trimethylsilyl Trifluoromethanesulfonate-Promoted Aldehyde-Aldehyde Aldol Addition-Deformylative Elimination., Grant J. Dixon, Michael R. Rodriguez, Tyler G. Chong, Kevin Y. Kim, C. Wade Downey
Synthesis Of Β,Β-Disubstituted Styrenes Via Trimethylsilyl Trifluoromethanesulfonate-Promoted Aldehyde-Aldehyde Aldol Addition-Deformylative Elimination., Grant J. Dixon, Michael R. Rodriguez, Tyler G. Chong, Kevin Y. Kim, C. Wade Downey
Chemistry Faculty Publications
In the presence of trimethylsilyl trifluoromethanesulfonate (TMSOTf) and 2,6-lutidine, α,α-disubstituted aldehydes condense with electron-rich aromatic aldehydes to yield β, β- disubstituted styrenes. More electron-rich aromatic aldehydes react more rapidly and in higher yield. Preliminary results suggest that the reaction may proceed via the ionization and formal deformylation of an aldol intermediate.