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
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
System: The UNT Digital Library
Advanced modeling of materials with PAOFLOW 2.0: New features and software design (open access)

Advanced modeling of materials with PAOFLOW 2.0: New features and software design

This article describes the recent re-design of the code and the new features and improvements in performance of PAOFLOW, a software tool that constructs tight-binding Hamiltonians from self-consistent electronic wavefunctions by projecting onto a set of atomic orbitals.
Date: September 2, 2021
Creator: Cesaroli, Frank T.; Supka, Andrew; Jayaraj, Anooja; Costa, Marcio; Siloi, Ilaria; Sławińska, Jagoda et al.
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
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-
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
System: The UNT Digital Library
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.)
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)
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.
System: The UNT Digital Library
Cysne et al. Reply (open access)

Cysne et al. Reply

This article is a response to a comment on the authors' original article "Disentangling Orbital and Valley Hall Effects in Bilayers of Transition Metal Dichalcogenides." The authors' response concludes that they do not believe the main points of the original Letter are affected by the Comment.
Date: October 1, 2021
Creator: Cysne, Tarik P.; Costa, Marcio; Canonico, Luis M.; Buongiorno Nardelli, Marco; Muniz, R. B. & Rappoport, Tatiana G.
System: The UNT Digital Library
Development of Neutral Red as a pH/pCO2 Luminescent Sensor for Biological Systems (open access)

Development of Neutral Red as a pH/pCO2 Luminescent Sensor for Biological Systems

This article demonstrates for the first time that Neutral Red (NR) can also serve as a CO2 sensor, because of NR’s unique optical properties, which change with dissolved carbon dioxide (dCO2) concentrations. In this article optical sensitivity of NR was quantified as a function of changes in absorption and emission spectra to dCO2 in a pH 7.3 buffer medium at eight dCO2 concentrations.
Date: August 5, 2021
Creator: Ericson, Megan N.; Shankar, Sindhu K.; Chahine, Laya M.; Omary, Mohammad A.; Hunt von Herbing, Ione & Marpu, Sreekar
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
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.
System: The UNT Digital Library
Early Oxidative Transformations During the Biosynthesis of Terrein and Related Natural Products (open access)

Early Oxidative Transformations During the Biosynthesis of Terrein and Related Natural Products

This article combines heterologous expression and in vitro studies to show that the flavin-dependent monooxygenase (FMO) TerC catalyzes the initial oxidative decarboxylation of 6-HM. The results demonstrate that the biosynthetic pathways of terrein and related(polychlorinated) congeners diverge after oxidative decarboxylation of the lactone precursor that is catalyzed by a conserved FMO and further indicate that early dehydration of the side chain is an essential step.
Date: June 11, 2021
Creator: Kahlert, Lukas; Bernardi, Darlon; Hauser, Maurice; Lóca, Laura P.; Berlinck, Roberto G. S.; Skellam, Elizabeth et al.
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.
System: The UNT Digital Library
Excited State Charge Separation in an Azobenzene-Bridged Perylenediimide Dimer – Effect of Photochemical Trans-Cis Isomerization (open access)

Excited State Charge Separation in an Azobenzene-Bridged Perylenediimide Dimer – Effect of Photochemical Trans-Cis Isomerization

Article demonstrating photoinduced charge transfer and separation events in a newly synthesized azobenzene-bridged perylenediimide-dimer (PDI-dimer). Results offer key insights on the role of the azobenzene bridge and the dimer geometry in governing the excited state charge transfer and separation in symmetrically linked PDI dimer.
Date: September 20, 2021
Creator: Zink-Lorre, Nathalie; Seetharaman, Sairaman; Gutiérrez-Moreno, David; Fernández-Lázaro, Fernando; Karr, Paul A. & D'Souza, Francis
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
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.
System: The UNT Digital Library
Henry’s law constants (IUPAC Recommendations 2021) (open access)

Henry’s law constants (IUPAC Recommendations 2021)

Article presenting a consistent set of recommendations to express the proportionality coefficient, “Henry’s law constant” of Henry's law.
Date: December 13, 2021
Creator: Sander, Rolf; Acree, William E. (William Eugene); De Visscher, Alex; Schwartz, Stephen E. & Wallington, Timothy J.
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
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-
System: The UNT Digital Library
New reactions of diazene and related species for modelling combustion of amine fuels (open access)

New reactions of diazene and related species for modelling combustion of amine fuels

Article discusses how potential energy surfaces for reactions involving N2H2 isomers of diazene (diimide) have been explored using density functional theory, with energies based on coupled-cluster theory. A focus is on processes that create or consume these species, and isomerization between the E (trans) and Z (cis) forms of HNNH. This is the accepted manuscript version of the published article.
Date: September 24, 2021
Creator: Marshall, Paul; Rawling, George R. & Glarborg, Peter
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.
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.
System: The UNT Digital Library