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Calculation of Abraham Model L-Descriptor and Standard Molar Enthalpies of Vaporization for Linear C7-C14 Alkynes From Gas Chromatographic Retention Index Data (open access)

Calculation of Abraham Model L-Descriptor and Standard Molar Enthalpies of Vaporization for Linear C7-C14 Alkynes From Gas Chromatographic Retention Index Data

Article determines Abraham model L solute descriptors for an additional 33 linear C7-C14 alkynes based on published gas chromatographic retention indices for solutes eluted from capillary columns coated with squalane and apiezon L stationary phases.
Date: 2021
Creator: Shanmugam, Neel; Eddula, Shrika; Acree, William E. (William Eugene) & Abraham, M. H. (Michael H.)
Object Type: Article
System: The UNT Digital Library
Ignition delay times of NH3/DME blends at high pressure and low DME fraction: RCM experiments and simulations (open access)

Ignition delay times of NH3/DME blends at high pressure and low DME fraction: RCM experiments and simulations

Authors of the article describe how autoignition delay times of ammonia/dimethyl ether (NH3/DME) mixtures were measured in a rapid compression machine with DME fractions of 0, 2 and 5 and 100% in the fuel. Analysis of the mechanism indicates that this 'early DME oxidation' generates reactive species that initiate the oxidation of ammonia, which in turn begins heat release that raises the temperature and accelerates the oxidation process towards ignition. This is the accepted manuscript version of the published article.
Date: January 14, 2021
Creator: Dai, Liming; Glarborg, Peter; Gersen, Sander; Marshall, Paul; Mokhov, Anatoli & Levinsky, Howard
Object Type: Article
System: The UNT Digital Library
Functional Porous Organic Polymers as Advanced Decontamination Materials for Water Purification (open access)

Functional Porous Organic Polymers as Advanced Decontamination Materials for Water Purification

Data management plan for the grant "Functional Porous Organic Polymers as Advanced Decontamination Materials for Water Purification." This project seeks to develop and deploy a new class of porous organic polymers which have high capacity and selectivity to rapidly remove heavy metal contaminants well below parts per million level standards set by the Environmental Protection Agency. The project will engineer porosity and surface chemistry of porous organic polymers to clean inorganic heavy metal contaminants from both surface water and wastewater. Porous organic polymers are robust, chemically and thermally stable, scalable, and modular, with very high surface area. The modularity of these polymers allows for a molecular-level tuning of the pore structure and surface chemistry that allows for engineered site-specificity of binding sites that target the heavy metal contaminants. Recent data shows these new materials offer a significant increase in capacity relative to benchmark materials, with a rapid removal of mercury and other heavy metal ions. This project will advance the concept by exploring rational design of these porous polymers with different topologies by customizing the monomer with various binding groups. The objectives of the project include design, synthesis, and characterization, followed by assessment of these materials to remove inorganic contaminants …
Date: 2021-02-01/2021-07-31
Creator: Ma, Shengqian
Object Type: Text
System: The UNT Digital Library
Disentangling Orbital and Valley Hall Effects in Bilayers of Transition Metal Dichalcogenides (open access)

Disentangling Orbital and Valley Hall Effects in Bilayers of Transition Metal Dichalcogenides

This article shows that a bilayer of 2H-MoS₂ is an orbital Hall insulator that exhibits a sizeable orbital Hall effect in the absence of both spin and valley Hall effects. The results are based on density functional theory and low-energy effective model calculations and strongly suggest that bilayers of TMDs are highly suitable platforms for direct observation of the orbital Hall insulating phase in two-dimensional materials.
Date: February 5, 2021
Creator: Cysne, Tarik P.; Costa, Marcio; Canonico, Luis M.; Buongiorno Nardelli, Marco; Muniz, R. B. & Rappoport, Tatiana G.
Object Type: Article
System: The UNT Digital Library
Bifunctional activation of methane by bioinspired transition metal complexes. A simple methane protease model (open access)

Bifunctional activation of methane by bioinspired transition metal complexes. A simple methane protease model

Article modeling Metal-based bifunctional methane activators using density functional theory. The research yields insight into possible avenues for bio-inspired methane activators.
Date: February 15, 2021
Creator: Anderson, Mary E.; Marks, Michael B. & Cundari, Thomas R., 1964-
Object Type: Article
System: The UNT Digital Library
Kinetic fall-off behavior for the Cl + Furan-2,5-dione (C4H2O3, maleic anhydride) reaction (open access)

Kinetic fall-off behavior for the Cl + Furan-2,5-dione (C4H2O3, maleic anhydride) reaction

Article discusses how rate coefficients, k, for the gas-phase Cl + Furan-2,5-dione (C4H2O3, maleic anhydride) reaction were measured over the 15–500 torr (He and N2 bath gas) pressure range at temperatures between 283 and 323 K. An atmospheric degradation mechanism for C4H2O3 is proposed based on the observed product yields and theoretical calculations of ring-opening pathways and activation barrier energies at the CBS-QB3 level of theory. This is the accepted manuscript version of the published article.
Date: February 15, 2021
Creator: Chattopadhyay, Aparajeo; Gierczak, Tomasz; Marshall, Paul; Papadimitriou, Vassileios C. & Burkholder, James B. (James Bart), 1954-
Object Type: Article
System: The UNT Digital Library
Calculation of the Vapour Pressure of Organic Molecules by Means of a Group-Additivity Method and Their Resultant Gibbs Free Energy and Entropy of Vaporization at 298.15 K (open access)

Calculation of the Vapour Pressure of Organic Molecules by Means of a Group-Additivity Method and Their Resultant Gibbs Free Energy and Entropy of Vaporization at 298.15 K

Article presenting the calculation of the vapour pressure of organic molecules at 298.15 K using a commonly applicable computer algorithm based on the group-additivity method. The standard entropy of vaporization ΔS°vap has been determined and compared with experimental data of 1129 molecules, exhibiting excellent conformance with a correlation coefficient R2 of 0.9598, a standard error σ of 8.14 J/mol/K and a medium absolute deviation of 4.68%.
Date: February 17, 2021
Creator: Naef, Rudolf & Acree, William E. (William Eugene)
Object Type: Article
System: The UNT Digital Library
Anion-enhanced excited state charge separation in a spiro-locked N-heterocycle-fused push-pull zinc porphyrin (open access)

Anion-enhanced excited state charge separation in a spiro-locked N-heterocycle-fused push-pull zinc porphyrin

This article presents a new type of push–pull charge transfer complex, viz., a spiro-locked N-heterocycle-fused zinc porphyrin, ZnP-SQ, that is shown to undergo excited state charge separation, which is enhanced by axial F⁻ binding to the Zn center. Spectroelectrochemical studies are used to identify the spectra of charge separated states and charge separation upon photoexcitation of ZnP is established.
Date: February 24, 2021
Creator: Chahal, Mandeep K.; Liyanage, Anudradha; Alsaleh, Ajyal Z.; Karr, P. A.; Hill, Jonathan P. & D'Souza, Francis
Object Type: Article
System: The UNT Digital Library
Developing a Biomanufacturing Platform for the Site-Selective Functionalization and Structural Diversification of Cytochalasan-Based Carbon Skeletons (open access)

Developing a Biomanufacturing Platform for the Site-Selective Functionalization and Structural Diversification of Cytochalasan-Based Carbon Skeletons

Data management plan for the grant, "Developing a Biomanufacturing Platform for the Site-Selective Functionalization and Structural Diversification of Cytochalasan-Based Carbon Skeletons." This project will identify fungal enzymes that efficiently modify more than one substrate in a predictable way. Also, enzymes will be engineered to expand the range of substrates. A biomanufacturing platform to synthesize bioactive molecules at lower costs will be the end result. Fungi can synthesize small molecules with complex structures using a number of highly coordinated enzymes. These molecules are difficult to make synthetically, and they can aid in crop production or have beneficial human health effects. Cytochalasans are phytotoxic, cytotoxic and actin-binding natural products. Produced by fungi, over 400 variants have been described. The structural diversity is partly explained by the flexibility of the enzymes that introduce and modify functional groups. These enzymes structurally rearrange the core carbon skeleton in a site-selective manner, often on more than one substrate. Genome mining will be used to identify cytochalasan tailoring enzymes. Overproducing strains will be characterized chemically. Transcription factor over-expression will be investigated. Targeted gene knock-out will confirm the function and scope of the enzymes. The enzymes will be engineered to expand their substrate range. Synthetic biology and metabolic …
Date: 2021-03-01/2024-02-29
Creator: Skellam, Elizabeth
Object Type: Text
System: The UNT Digital Library
A window-space-directed assembly strategy for the construction of supertetrahedron-based zeolitic mesoporous metal–organic frameworks with ultramicroporous apertures for selective gas adsorption (open access)

A window-space-directed assembly strategy for the construction of supertetrahedron-based zeolitic mesoporous metal–organic frameworks with ultramicroporous apertures for selective gas adsorption

Article presenting a novel window-space-directed assembly strategy for the synthesis of zeolitic mesoporous MOFs with ultramicroporous apertures based on supertetrahedral building units. This article provides an effective and innovative strategy and paves the way for the future design and synthesis of functional, highly connected materials for various applications.
Date: March 5, 2021
Creator: Zhang, Lei; Li, Fangfang; You, Jianjun; Hua, Nengbin; Wang, Qianting; Si, Junhui et al.
Object Type: Article
System: The UNT Digital Library
Pyrazinacenes exhibit on-surface oxidation-state-dependent conformational and self-assembly behaviours (open access)

Pyrazinacenes exhibit on-surface oxidation-state-dependent conformational and self-assembly behaviours

This article reports pyrazinacenes containing the dihydro-decaazapentacene and dihydro-octaazatetracene chromophores and compares their properties/functions as a model case at an oxidizing metal substrate.
Date: March 10, 2021
Creator: Miklík, David; Mousavi, S. Fatemeh; Burešová, Zuzana; Middleton, Anna; Matsushita, Yoshitaka; Labuta, J. et al.
Object Type: Article
System: The UNT Digital Library
Covalent organic framework nanofluidic membrane as a platform for highly sensitive bionic thermosensation (open access)

Covalent organic framework nanofluidic membrane as a platform for highly sensitive bionic thermosensation

Article reporting a nanofluidic membrane based on an ionic covalent organic framework (COF) that is capable of intelligently monitoring temperature variations and expressing it in the form of continuous potential differences. This article pioneers a way to explore COFs for mimicking the sophisticated signaling system observed in the nature.
Date: March 23, 2021
Creator: Zhang, Pengcheng; Chen, Sifan; Zhu, Changjia; Hou, Linxiao; Xian, Weipeng; Zuo, Xiuhui et al.
Object Type: Article
System: The UNT Digital Library
Theoretical modeling study of the reaction H + CF4 → HF + CF3 (open access)

Theoretical modeling study of the reaction H + CF4 → HF + CF3

This article determines the rate constant of the reaction H + CF₄ → HF + CF₃, characterizing its transition state by quantum-chemical methods.
Date: March 23, 2021
Creator: Cobos, Carlos J.; Knight, Gary; Marshall, Paul & Troe, Jürgen
Object Type: Article
System: The UNT Digital Library
Accelerated reliability testing of Cu-Al bimetallic contact by a micropattern corrosion testing platform for wire bond device application (open access)

Accelerated reliability testing of Cu-Al bimetallic contact by a micropattern corrosion testing platform for wire bond device application

This article presents a novel method of in-situ investigation of the device corrosion process to capture the real time mechanistic information not obtained in standard reliability testing.
Date: March 26, 2021
Creator: Ashok Kumar, Goutham Isaac; Alptekin, John; Caperton, Joshua; Salunke, Ashish & Chyan, Oliver Ming-Ren
Object Type: Article
System: The UNT Digital Library
Green synthesis of olefin-linked covalent organic frameworks for hydrogen fuel cell applications (open access)

Green synthesis of olefin-linked covalent organic frameworks for hydrogen fuel cell applications

This article creates a green strategy to fabricate a highly crystalline olefin-linked pyrazine-based covalent organic framework (COF) with high robustness and porosity under solvent-free conditions. This study opens up new possibilities for the green synthesis of advanced materials and provides important guidance for the rational design and synthesis of polymeric materials for proton-exchange membrane fuel cell applications.
Date: March 31, 2021
Creator: Wang, Zhifang; Yang, Yi; Zhao, Zhengfeng; Zhang, Penghui; Zhang, Yushu; Liu, Jinjin et al.
Object Type: Article
System: The UNT Digital Library
Acetaldehyde oxidation at elevated pressure (open access)

Acetaldehyde oxidation at elevated pressure

A detailed chemical kinetic model for oxidation of CH3CHO at intermediate to high temperature and elevated pressure has been developed and evaluated by comparing predictions to novel high-pressure flow reactor experiments as well as shock tube ignition delay measurements and jet-stirred reactor data from literature. The flow reactor experiments were conducted with a slightly lean CH3CHO/O2 mixture highly diluted in N2 at 600–900 K and pressures of 25 and 100 bar. This is the accepted manuscript version of the published article.
Date: April 10, 2021
Creator: Hashemi, Hamid; Christensen, Jakob M.; Marshall, Paul & Glarborg, Peter
Object Type: Article
System: The UNT Digital Library
Experimental and kinetic modeling study of oxidation of acetonitrile (open access)

Experimental and kinetic modeling study of oxidation of acetonitrile

Article asserts that oxidation of acetonitrile has been studied in a flow reactor in the absence and presence of nitric oxide. A detailed chemical kinetic model for oxidation of acetonitrile was developed, based on a critical evaluation of data from literature. This is the accepted manuscript version of the published article.
Date: April 10, 2021
Creator: Alzueta, María U.; Guerrero, Marta; Millera, Angela; Marshall, Paul & Glarborg, Peter
Object Type: Article
System: The UNT Digital Library
Discovery of higher-order topological insulators using the spin Hall conductivity as a topology signature (open access)

Discovery of higher-order topological insulators using the spin Hall conductivity as a topology signature

This article shows a connection between spin Hall effect and HOTIs using a combination of ab initio calculations and tight-binding modeling. The model demonstrates how a non-zero bulk midgap spin Hall conductivity (SHC) emerges within the HOTI phase. This work guides novel experimental and theoretical advances towards higher-order topological insulator realization and applications.
Date: April 12, 2021
Creator: Costa, Marcio; Mera Acosta, Carlos; Padilha, Antonio C.M.; Cerasoli, Frank T.; Buongiorno Nardelli, Marco & Fazzio, Adalberto
Object Type: Article
System: The UNT Digital Library
Proton reduction by phosphinidene-capped triiron clusters (open access)

Proton reduction by phosphinidene-capped triiron clusters

This article prepares and examines Bis(phosphinidene)-capped triiron carbonyl clusters, including electron rich derivatives formed by substitution with chelating diphosphines as proton reduction catalysts.
Date: April 20, 2021
Creator: Rahaman, Ahibur; Lisensky, George C.; Haukka, Matti; Tocher, Derek A.; Richmond, Michael G.; Colbran, Stephen B. et al.
Object Type: Article
System: The UNT Digital Library
Oxygen atom transfer catalysis by dioxidomolybdenum(VI) complexes of pyridyl aminophenolate ligands (open access)

Oxygen atom transfer catalysis by dioxidomolybdenum(VI) complexes of pyridyl aminophenolate ligands

This article synthesizes and characterizes a series of new cationic dioxidomolybdenum(VI) complexes [MoO₂(Lⁿ)]PF₆ (2–5) with the tripodal tetradentate pyridyl aminophenolate ligands HL²-HL⁵.
Date: April 21, 2021
Creator: Hossain, Kamal; Schachner, Jörg A.; Haukka, Matti; Richmond, Michael G.; Mösch-Zanetti, Nadia C.; Lehtonen, Ari et al.
Object Type: Article
System: The UNT Digital Library
Evaluation of nine condensed-phase force fields of the GROMOS, CHARMM, OPLS, AMBER, and OpenFF families against experimental cross-solvation free energies (open access)

Evaluation of nine condensed-phase force fields of the GROMOS, CHARMM, OPLS, AMBER, and OpenFF families against experimental cross-solvation free energies

This article builds on a previous study [Kashefolgheta et al., J. Chem. Theory. Comput., 2020, 16, 7556–7580] by extending the comparison to five additional force fields, GROMOS-54A7, GROMOS-ATB, OPLS-LBCC, AMBER-GAFF2, and OpenFF.
Date: April 30, 2021
Creator: Kashefolgheta, Sadra; Wang, Shuzhe; Acree, William E. (William Eugene) & Hünenberger, Philippe H.
Object Type: Article
System: The UNT Digital Library
Biosynthesis of 6-Hydroxymellein Requires a Collaborating Polyketide Synthase-like Enzyme (open access)

Biosynthesis of 6-Hydroxymellein Requires a Collaborating Polyketide Synthase-like Enzyme

This article investigates a new architecture for iterative Type I polyketide synthases (PKS) from fungi.
Date: May 10, 2021
Creator: Kahlert, Lukas; Villanueva, Miranda; Cox, Russell J. & Skellam, Elizabeth
Object Type: Article
System: The UNT Digital Library
Self-reporting molecularly imprinted polymer with the covalently immobilized ferrocene redox probe for selective electrochemical sensing of p-synephrine (open access)

Self-reporting molecularly imprinted polymer with the covalently immobilized ferrocene redox probe for selective electrochemical sensing of p-synephrine

Article simultaneously imprinting the p-synephrine 1 template and covalently immobilizing a a ferrocene redox probe in a (bis-bithiophene)-based polymer. The resulting molecularly imprinted polymer (MIP) was deposited on the Pt electrode as a thin film to form a redox self-reporting MIP film-based chemosensor.
Date: June 10, 2021
Creator: Lach, Patrycja; Cieplak, Maciej; Noworyta, Krzysztof R.; Pieta, Piotr; Lisowski, Wojciech; Kalecki, Jakub et al.
Object Type: Article
System: The UNT Digital Library
Self-reporting molecularly imprinted polymer with the covalently immobilized ferrocene redox probe for selective electrochemical sensing of p-synephrine (open access)

Self-reporting molecularly imprinted polymer with the covalently immobilized ferrocene redox probe for selective electrochemical sensing of p-synephrine

This article uses a molecularly imprinted polymer (MIP) to form a redox self-reporting MIP film-based chemosensor applied for p-synephrine determination.
Date: June 10, 2021
Creator: Lach, Patrycja; Cieplak, Maciej; Noworyta, K.; Pieta, Piotr; Lisowski, Wojciech; Kalecki, Jakub et al.
Object Type: Article
System: The UNT Digital Library