Physical Sciences and Mathematics Commons^™

Reduced Metal Nanocatalysts For Selective Electrochemical Hydrogenation Of Biomass-Derived 5-(Hydroxymethyl)Furfural To 2, 5-Bis(Hydroxymethyl)Furan In Ambient Conditions, Baleeswaraiah Muchharla, Moumita Dikshit, Ujjwal Pokharel, Ravindranath Garimella, Adetayo Adedeji, Kapil Kumar, Wei Cao, Hani Elsayed-Ali, Kishor Kumar Sadasivuni, Naif Abdullah Al-Dhabi, Sandeep Kumar, Bijandra Kumar

Chemistry & Biochemistry Faculty Publications

Selective electrochemical hydrogenation (ECH) of biomass-derived unsaturated organic molecules has enormous potential for sustainable chemical production. However, an efficient catalyst is essential to perform an ECH reaction consisting of superior product selectivity and a higher conversion rate. Here, we examined the ECH performance of reduced metal nanostructures i.e., reduced Ag (rAg) and reduced copper (rCu) prepared via electrochemical or thermal oxidation and electrochemical reduction process, respectively. Surface morphological analysis suggests formation of nanocoral and entangled nanowire structure formation for rAg and rCu catalysts. rCu exhibits slight enhancement in ECH reaction performance in comparison to the pristine Cu. However, the rAg …

Halogen Bonding Interactions Of Haloaromatic Endocrine Disruptors And The Potential For Inhibition Of Iodothyronine Deiodinases, Craig A. Bayse

Chemistry & Biochemistry Faculty Publications

Halogen bonding (XB) is a potential mechanism for the inhibition of the thyroid-activating/deactivating iodothyronine deiodinase family of selenoproteins through interactions with halogenated endocrine disrupting compounds (EDCs). Trends in XB interactions were examined using density functional theory for a series of polyhalogenated dibenzo-1,4-dioxins, biphenyls, and other EDCs with methylselenolate, a simple model of the Dio active site selenocysteine. The strengths of the interactions depend upon the halogen (Br>Cl), the degree of substitution, and the position of the acceptor. In terms of donor-acceptor energies, interactions at the meta position are often the strongest, suggesting a link to the topology of THs, …

Surface Engineering And Design Strategy For Surface-Amorphized Tio 2 @Graphene Hybrids For High Power Li-Ion Battery Electrodes, Tengfei Zhou, Yang Zheng, Hong Gao, Shudi Min, Sean Li, Hua-Kun Liu, Zaiping Guo

Australian Institute for Innovative Materials - Papers

Electrode materials with battery-like high capacity and capacitorlike rate performance are highly desirable, since they would signifi cantly advance next-generation energy storage technology. [ 1 ] TiO 2 has received increasing attention as an anode material for lithium-ion batteries (LIBs) due to its good reversible capacity and low volume expansion upon lithiation, as well as its low cost and safe lithiation potential. [ 2 ] The low lithium-ion mobility within the crystalline phase TiO 2 , however, together with its poor electrical conductivity, means that only a thin surface layer of the host material is available for Li intercalation at …

An Investigation Of The Nanomechanical Properties Of 0.5ba(Ti0.8zr0.2)O3-0.5(Ba0.7ca0.3)Tio3 Thin Films, Zhong-Lan Cai, Zeng-Mei Wang, Huan-Huan Wang, Zhenxiang Cheng, Baowen Li, Xin-Li Guo, Hideo Kimura, Akira Kasahara

Australian Institute for Innovative Materials - Papers

For practical application, the functional piezoelectric film in microelectromechanical systems should meet the requirement of physical properties, as well as the mechanical properties. In this article, 0.5Ba(Ti0.8Zr0.2)O3-0.5(Ba0.7Ca0.3)TiO3 (0.5BZT-0.5BCT) thin films with varied properties were prepared on (100) Si substrates via a sol-gel technique at different annealing temperatures. The effects of the annealing temperature on the morphology, piezoelectricity, hardness, and elastic modulus were studied. Particular attention was paid to the surface frictional behavior of films, and the changes in the friction force can be radically explained in terms of differences in the hardness/elastic modulus ratio and the residual stress of films. …

Mono-N-Acyl-2,6-Diaminopimelic Acid Derivatives: Analysis By Electromigration And Spectroscopic Methods And Examination Of Enzyme Inhibitory Activity, Jan Hlaváček, Miloslava Vítovcová, Petra Sázelová, Jan Pícha, Václav Vaněk, Miloš Buděšínský, Jiří Jiráček, Danuta M. Gillner, Richard C. Holz, Ivan Mikšík, Václav Kašička

Chemistry Faculty Research and Publications

Thirteen mono-N-acyl derivatives of 2,6-diaminopimelic acid (DAP)—new potential inhibitors of the dapE-encoded N-succinyl-l,l-diaminopimelic acid desuccinylase (DapE; EC 3.5.1.18)—were analyzed and characterized by infrared (IR) and nuclear magnetic resonance (NMR) spectroscopies and two capillary electromigration methods: capillary zone electrophoresis (CZE) and micellar electrokinetic chromatography (MEKC). Structural features of DAP derivatives were characterized by IR and NMR spectroscopies, whereas CZE and MEKC were applied to evaluate their purity and to investigate their electromigration properties. Effective electrophoretic mobilities of these compounds were determined by CZE in acidic and alkaline background electrolytes (BGEs) and by MEKC in acidic and alkaline BGEs …

Crystal Structure Of 4,5-Bis-(3,4,5-Trimethoxyphenyl)-2H-1,2,3-Triazole Methanol Monosolvate, Nikhil Reddy Madadi, Narsimha Reddy Penthala, Shobanbabu Bommagani, Sean Parkin, Peter A. Crooks

Chemistry Faculty Publications

The title compound, C₂₀H₂₃N₃O₆·CH₃OH, was synthesized by [3 + 2] cyclo­addition of (Z)-2,3-bis­(3,4,5-tri­meth­oxy­phen­yl)acrylo­nitrile with sodium azide and ammonium chloride in DMF/water. The central nitro­gen of the triazole ring is protonated. The dihedral angles between the triazole ring and the 3,4,5-tri­meth­oxy­phenyl ring planes are 34.31 (4) and 45.03 (5)°, while that between the 3,4,5-tri­meth­oxy­phenyl rings is 51.87 (5)°. In the crystal, the mol­ecules, along with two methanol solvent mol­ecules are linked into an R ⁴ ₄(10) centrosymmetric dimer by N—H⋯O and O—H⋯N hydrogen bonds.

Hierarchical Porous Li 2 Mg(Nh)2@C Nanowires With Long Cycle Life Towards Stable Hydrogen Storage, Guanglin Xia, Yingbin Tan, Dan Li, Zaiping Guo, Hua-Kun Liu, Zongwen Liu, Xuebin Yu

Australian Institute for Innovative Materials - Papers

The hierarchical porous Li₂Mg(NH)₂@C nanowires full of micropores, mesopores, and macropores are successfully fabricated via a single-nozzle electrospinning technique combined with in-situ reaction between the precursors, i.e., MgCl₂ and LiN₃, under physical restriction upon thermal annealing. The explosive decomposition of LiN₃ well dispersed in the electrospun nanowires during carbothermal treatment induces a highly porous structure, which provides a favourable way for H₂ delivering in and out of Li₂Mg(NH)₂ nanoparticles simultaneously realized by the space-confinement of the porous carbon coating. As a result, the thus-fabricated Li₂Mg(NH)_{2 …}

Hydrostatic Piezoelectric Properties Of [011] Poled Pb(Mg 1/3nb2/3)O3-Pbtio3 Single Crystals And 2-2 Lamellar Composites, Lili Li, Shujun Zhang, Zhuo Xu, Xuecang Geng, Fei Wen, Jun Luo, Thomas R. Shrout

Australian Institute for Innovative Materials - Papers

The hydrostatic piezoelectric properties of [011] poled Pb(Mg 1/3Nb2/3)O3-PbTiO3 (PMN-PT) crystals and corresponding 2-2 crystal/epoxy composites were investigated. The crystal volume ratio and compositional dependencies of the hydrostatic charge and voltage coefficients (dh and gh) and hydrostatic figure of merit (FOM) dh x gh were determined, where large FOM value of 3.2 pm2/N with high stability as a function of hydrostatic pressure was achieved for rhombohedral crystal composites. In addition, the stress amplification effects of the face-plate and different epoxy matrixes were investigated, with maximum FOM value being on the order of 92 pm2/N, indicating that 2-2 crystal/epoxy composites are …

Polarization Alignment, Phase Transition, And Piezoelectricity Development In Polycrystalline 0.5ba(Zr0.2 Ti0.8)O3-0.5(Ba0.7 Ca0.3)Tio3, Hanzheng Guo, Brian K. Voas, Shujun Zhang, Chao Zhou, Xiaobing Ren, Scott P. Beckman, Xiaoli Tan

Australian Institute for Innovative Materials - Papers

The microstructural origin of the exceptionally high piezoelectric response of polycrystalline 0.5Ba(Zr0.2Ti0.8)O3-0.5(Ba0.7Ca0.3)TiO3 is investigated using in situ transmission electron microscopy, in addition to a wide variety of bulk measurements and first-principles calculations. A direct correlation is established relating a domain wall-free state to the ultrahigh piezoelectric d33 coefficient in this BaTiO3-based composition. The results suggest that the unique single-domain state formed during electrical poling is a result of a structural transition from coexistent rhombohedral and tetragonal phases to an orthorhombic phase that has an anomalously low elastic modulus. First-principles calculations indicate that incorporating Ca2+ and Zr4+ into BaTiO3 reduces the …

Colour Tunable Electrochromic Devices Based On Pprodot-(Hx)2 And Pprodot-(Ethx)2 Polymers, Bo Weng, Syed Ashraf, Peter C. Innis, Gordon G. Wallace

Australian Institute for Innovative Materials - Papers

The most commonly used method to tune the colour transition states of an ECD is to modify the chemical structure of the electrochromic polymers to achieve the desired transparent to dark state switching colours. However, this approach can present significant synthetic challenges that typically result in a compromise in device performance parameters such as contrast range or stability as well as solvent processability. In this study we have investigated tuning the dark-state colour of an ECD (at +0.8 V) by solution mixing poly(3,3-dihexyl-3,4-dihydro-2H-thieno[3,4-b][1,4]dioxepine) (PProDOT-(Hx)2), which has an excellent contrast performance but with an esthetically undesirable purple colour transition, with poly(3,3-bis(2-ethylhexyl)-3,4-dihydro-2H-thieno …

2-(10′,10′-Dimethyl-3′-Sulfanylidene-4′- Azatricyclo[5.2.1.01,5]Decan-2′-Yl)-10,10-Dimethyl-4- Azatricyclo[5.2.1.01,5]Decane-3-Thione, Ashley Walker, Craig M. Forsyth, Patrick Perlmutter

Australian Institute for Innovative Materials - Papers

The title compound, C₂₈H₄₀N₂O₂S₂, was obtained as a minor product from an anti-aldol reaction between the corresponding N-propionyl­thiol­actam and benzaldehyde. The asymmetric unit contains one half-molecule, which is completed by inversion symmetry. The molecule displays a nearly eclipsed conformation along the central C-C bond with a C-C-C-C- torsion angle of 20.4 (3)°.

Direct Observation Of Domain Wall Motion And Novel Dielectric Loss In 0.23pb(In1/2nb1/2)O3-0.42pb(Mg1/3 Nb2/3)O3-0.35pbtio3 Crystals, Dabin Lin, Zhenrong Li, Fei Li, Shujun Zhang

Australian Institute for Innovative Materials - Papers

Domain wall motion was directly observed at temperatures near to the monoclinic-to-tetragonal phase transition temperature (TM-T) in [001]-oriented 0.23Pb(In1/2Nb1/2)O3-0. 42Pb(Mg1/3Nb2/3)O3-0.35PbTiO3 (0.23PIN-0.42PMN-0.35PT) single crystals using a polarizing light microscope, and evident 90°and 180°domain switches were observed near the Curie temperature (TC). Two dielectric loss anomalies were observed at temperatures near TM-T in the [001]-oriented PIN-PMN-PT single crystals, while an additional dielectric loss peak was found at temperatures a few degrees below TC, which was associated with domain wall motion. Based on the domain structure observations, a domain switching mechanism was proposed to explain the novel dielectric loss peak at several degrees …

Improved Dehydrogenation Properties Of The Combined Mg(Bh4) 2·6nh3-Nnh3bh3 System, Xiaowei Chen, Feng Yuan, Qinfen Gu, Yingbin Tan, Hua-Kun Liu, S X. Dou, Xuebin Yu

Australian Institute for Innovative Materials - Papers

A combined strategy via mixing Mg(BH4)2·6NH3 with ammonia borane (AB) is employed to improve the dehydrogenation properties of Mg(BH4)2·6NH3. The combined system shows a mutual dehydrogenation improvement in terms of dehydrogenation temperature and hydrogen purity compared to the individual components. A further improved hydrogen liberation from the Mg(BH4)2·6NH3–6AB is achieved with the assistance of ZnCl2, which plays a crucial role in stabilizing the NH3 groups and promoting the recombination of NHδ+⋯HBδ−. Specifically, the Mg(BH4)2·6NH3–6AB/ZnCl2 (with a mole ratio of 1:0.5) composite is shown to release over 7 wt.% high-pure hydrogen (>99 mol%) at 95 °C within 10 min, thereby …

Crystallization, Phase Evolution And Ferroelectric Properties Of Sol-Gel-Synthesized Ba(Ti0.8zr0.2)O3- X(Ba0.7ca0.3)Tio3 Thin Films, Zeng-Mei Wang, Kuan Zhao, Xin-Li Guo, Wei Sun, Hua-Long Jiang, Xue-Qin Han, Xu-Tang Tao, Zhen-Xiang Cheng, Hong-Yang Zhao, Hideo Kimura, Guo-Liang Yuan, Jiang Yin, Zhi-Guo Liu

Australian Institute for Innovative Materials - Papers

A lead-free piezoelectric material with ultra-high properties, Ba(Ti0.8Zr0.2)O3-x(Ba0.7Ca0.3)TiO3(BZT-xBCT) nanocrystals was synthesized via a sol-gel method, and the corresponding thin films were also deposited on Pt/Ti/SiO2/Si substrates by a spin-coating approach. The BZT-xBCT thin film exhibited a high remnant polarization of 22.15 mC cm2 with a large coercive field of 68.06 kV cm1. The resultant gel is calcined at various elevated temperatures and studied with FTIR/XRD/Raman/DSC-TGA/AFM/SEM techniques for gel composition, crystallization, phase transition, thermochemistry and the morphology of the film. Although the room temperature crystal structure of the BZT-xBCT nanocrystals appears to be a standard perovskite structure by conventional X-ray diffraction …

Phase Gap In Pseudoternary R1-Yry Mn2x 2-Xxx Compounds, Jianli Wang, S J. Kennedy, S J. Campbell, M Hofmann, S X. Dou

Australian Institute for Innovative Materials - Papers

Our neutron diffraction investigation of PrMn₂Ge_2−xSi_x reveals a clear separation into two magnetic phases, canted ferromagnetic (Fmc) and antiferromagnetic (AFmc), between x = 1.0 and 1.2 and a commensurate phase gap in the lattice, due to magnetostrictive distortion. This remarkable magnetoelastic phenomenon is driven by a nonuniform atomic distribution on the X site which in turn produces subtle variations in the local lattice and abrupt changes in the Mn-Mn magnetic exchange interaction. Our results show that coexistence of Fmc and AFmc phases depends on lattice parameter, chemical pressure from the rare-earth and metalloid sites, and …

Polypyrrole Doped With Redox-Active Poly(2-Methoxyaniline-5-Sulfonic Acid) For Lithium Secondary Batteries, Yang Yang, Caiyun Wang, Syed A. Ashraf, Gordon G. Wallace

Australian Institute for Innovative Materials - Papers

Polypyrrole is a promising electrode material for flexible/bendable energy storage devices due to its inherent fast redox switching, mechanical flexibility, easy processability and being environmentally benign. However, its low attainable capacity limits its practical applications. Here, we synthesise a polypyrrole/poly(2-methoxyaniline-5-sulfonic acid) (PPy/PMAS) composite by incorporating redox-active PMAS into a PPy matrix via an electropolymerization method. For comparison, polypyrrole containing the electrochemically inert dopant p-toluenesulfonate (PPy-pTS) was prepared under the same conditions. The resultant PPy/PMAS film shows greatly improved electrochemical properties by harnessing the contribution from PMAS, i.e. higher specific capacity, better rate capability and improved cycling stability when used as …

Electrically Conductive Coatings Of Nickel And Polypyrrole/Poly(2- Methoxyaniline-5-Sulfonic Acid) On Nylon Lycra® Textiles, B C. Kim, P C. Innis, Gordon G. Wallace, C T.J Low, F C. Walsh, W J. Cho, K H. Yu

Australian Institute for Innovative Materials - Papers

Woven nylon Lycra® has been coated with finely-divided electroless nickel-phosphorus, polypyrrole and electroless nickel/polypyrrole to produce flexible and electrically conductive textiles. The coated textiles were tested for their electrochemical activity, electrical resistivity and resistivity in response to mechanical strain. Pre-dyeing the textile with poly(2-methoxyaniline-5-sulfonic acid) (PMAS) prior to electroless metallization by electroless nickel and via chemical polymerization of polypyrrole was found to be beneficial in enhancing the resultant coating as well as stabilizing surface resistance responses when exposed to a wide range of strain. The mass gain due to the nickel coating was found to increase linearly with deposition time. …

Microwave-Assisted Polystyrene Sulfonatecatalyzed Synthesis Of Novel Pyrroles, Rosario Astrid Vargas Cardenas, Blanca Olinda Quintanilla Leal, Ashwini Reddy, Debasish Bandyopadhyay, Bimal K. Banik

Chemistry Faculty Publications and Presentations

Background: Pyrroles are widely distributed in nature and important biologically active molecules. The reaction of amines with 2,5-dimethoxytetrahydrofuran is a promising pathway for the synthesis of pharmacologically active pyrroles under microwave irradiation.

Results: Microwave-induced polystyrenesulfonate-catalyzed synthesis of pyrroles from amines and 2,5- diemthoxytetrahydrofuran has been accomplished with excellent yield. This method produces pyrroles with polyaromatic amines.

Conclusion: The present procedure for the synthesis of N-aromatic substituted pyrroles will find useful application in the area of pharmacologically active molecules.

Synthesis And Anti-Leukaemic Activity Of Pyrrolo[3,2,1-Hi]Indole-1,2- Diones, Pyrrolo[3,2,1-Ij]Quinoline-1,2-Diones And Other Polycyclic Isatin Derivatives, Lidia Matesic, Julie M. Locke, Kara Vine, Marie Ranson, John B. Bremner, Danielle Skropeta

Faculty of Science - Papers (Archive)

To further expand the structure–cytotoxic activity relationships of isatin derivatives and to reduce flexibility in substituent groups at nitrogen, 20 analogues incorporating a ring system between the N1 and C7 atoms of isatin were prepared using a variety of synthetic strategies. This yielded pyrroloindole-, pyrroloquinoline-, pyrroloacridine-, pyrrolophenanthridine- and benzopyrrolophenanthridine-based systems with embedded isatin moieties, the latter possessing a novel carbon skeleton. These compounds were subsequently assessed for their in vitro cytotoxicity against human U937 lymphoma cells, with the brominated pyrroloacridine dione 27 showing the most promising activity (IC50 3.01 μM) after 24 h.

Different Radiolabelling Methods Alter The Pharmacokinetic And Biodistribution Properties Of Plasminogen Activator Inhibitor Type 2 (Pai-2) Forms, Marie Ranson, Paula Berghofer, Kara L. Vine, Ivan Greguric, Rachael Shepherd, Andrew Katsifis

Faculty of Science - Papers (Archive)

Introduction: Tumour-associated urokinase plasminogen activator (uPA) is a critical marker of invasion and metastasis, and it is recognised as having strong prognostic relevance as well as being a therapeutic target. The specific uPA inhibitor plasminogen activator inhibitor type-2 (PAI-2, SerpinB2) specifically targets cell bound uPA and is internalised. Furthermore, preclinical studies have established the “proof-of-principle” of uPA-targeting by PAI-2-cytotoxin conjugates in human carcinoma models. However, these studies also suggest that PAI-2 is rapidly cleared via the renal system with low total dose reaching the tumour. In this study, a comparative single photon emission computed tomography (SPECT) and biodistribution (BD) analysis …

Comparisons Of Observed And Modeled Oh And Ho 2 Concentrations During The Ambient Measurement Period Of The Hoxcomp Field Campaign, Y Kanaya, A Hofzumahaus, H-P Dorn, T Brauers, H Fuchs, F Holland, F Rohrer, B Bohn, R Tillmann, Rebekah Wegener, A Wahner, Y Kajii, K Miyamoto, S Nishida, K Watanabe, A Yoshino, Dagmar C. Kubistin, M Martinez, M Rudolf, H Harder, H Berresheim, T Elste, C Plass-Dulmer, G Stange, J Kleffmann, Y Elshorbany, U Schurath

Faculty of Science - Papers (Archive)

A photochemical box model constrained by ancillary observations was used to simulate OH and HO 2 concentrations for three days of ambient observations during the HOxComp field campaign held in Jülich, Germany in July 2005. Daytime OH levels observed by four instruments were fairly well reproduced to within 33% by a base model run (Regional Atmospheric Chemistry Mechanism with updated isoprene chemistry adapted from Master Chemical Mechanism ver. 3.1) with high R 2 values (0.72-0.97) over a range of isoprene (0.3-2 ppb) and NO (0.1-10 ppb) mixing ratios. Daytime HO 2(*) levels, reconstructed from the base model results taking into …

Effects Of Atmospheric Light Scattering On Spectroscopic Observations Of Greenhouse Gases From Space: Validation Of Ppdf-Based Co 2 Retrievals From Gosat, Sergey Oshchepkov, Andrey Bril, Tatsuya Yokota, Isamu Morino, Yukio Yoshida, Tsuneo Matsunaga, Dmitry Belikov, Debra Wunch, Paul Wennberg, Geoffrey Toon, Christopher O'Dell, André Butz, Sandrine Guerlet, Austin Cogan, Hartmut Boesch, Nawo Eguchi, Nicholas Deutscher, David Griffith, Ronald Macatangay, Justus Notholt, Ralf Sussmann, Markus Rettinger, Vanessa Sherlock, John Robinson, Esko Kyro, Pauli Heikkinen, Dietrich G. Feist, Tomoo Nagahama, Nikolay Kadygrov, Shamil Maksyutov, Osamu Uchino, Hiroshi Watanabe

Faculty of Science - Papers (Archive)

This report describes a validation study of Greenhouse gases Observing Satellite (GOSAT) data processing using ground-based measurements of the Total Carbon Column Observing Network (TCCON) as reference data for column-averaged dry air mole fractions of atmospheric carbon dioxide (X CO2). We applied the photon path length probability density function method to validate X CO2 retrievals from GOSAT data obtained during 22months starting from June 2009. This method permitted direct evaluation of optical path modifications due to atmospheric light scattering that would have a negligible impact on ground-based TCCON measurements but could significantly affect gas retrievals when observing reflected sunlight from …

Gating The Charge State Of Single Fe Dopants In The Topological Insulator Bi 2 Se 3 With A Scanning Tunneling Microscope, Canli Song, Yeping Jiang, Yi-Lin Wang, Zhi Li, Lili Wang, Ke He, Xi Chen, Xu-Cun Ma, Qi-Kun Xue

Australian Institute for Innovative Materials - Papers

Low-temperature scanning tunneling microscope (STM) is exploited to study directly the atomic and electronic structures of single Fe dopants in topological insulator Bi2Se3 thin films. Fe atoms predominantly and isovalently substitute for two distinct Bi sites at the subsurface with charge neutrality. In the vicinity of Fe substitutions, circular depressions in STM topography and sharp rings in spatially resolved conductance map, whose diameters apparently depend on the tunneling conditions, are observed. We show that the phenomena correlate well with the switching between Fe3+ and Fe2+ charge states due to the gate effect of the tunneling tip, as further evidenced by …

Removal Of 2,4-Dichlorophenoxyacetic Acid By Calcined Zn–Al–Zr Layered Double Hydroxide, Allen Chaparadza, Jeanne Hossenlopp

Chemistry Faculty Research and Publications

The adsorption equilibrium, kinetics, and thermodynamics of removal of 2,4-dichlorophenoxy-acetic acid (2,4-D) from aqueous solutions by a calcined Zn–Al layered double hydroxide incorporated with Zr⁴⁺ were studied with respect to time, temperature, pH, and initial 2,4-D concentration. Zr⁴⁺ incorporation into the LDH was used to enhance 2,4-D uptake by creating higher positive charges and surface/layer modification of the adsorbent. The LDH was capable of removing up to 98% of 2,4-D from 5 to 400 ppm aqueous at adsorbent dosages of 500 and 5000 mg L⁻¹. The adsorption was described by a Langmuir-type isotherm. The percentage 2,4-D …

Pricing Of Volatility Derivatives Using 3/2-Stochastic Models, Joanna Goard

Faculty of Informatics - Papers (Archive)

Analytic solutions are found for prices of both variance and volatility swaps and VIX options under new 3/2- stochastic models for the dynamics of the underlying assets. The main features of the new stochastic differential equations are an empirically validated cv^3/2 diffusion term, a nonlinear drift providing a balancing effect of a stronger mean reversion with high volatility, and for the case of the variance and volatility swaps, a free function of time as a moving target in the reversion term, allowing additional flexibility for model calibration against market data.

Bazr(0.8)Y(0.2)O(3-Delta)-Nio Composite Anodic Powders For Proton-Conducting Sofcs Prepared By A Combustion Method, Lei Bi, Emiliana Fabbri, Ziqi Sun, Enrico Traversa

Australian Institute for Innovative Materials - Papers

BaZr_0.8Y_0.2O_3-∂ (BZY)-NiO composite powders with different BZY-NiO weight ratios were prepared by a combustion method as anodes for proton-conducting solid oxide fuel cells (SOFCs). After heating to 1100^°C for 6 h, the composite powders were made of a well-dispersed mixture of two phases, BZY and NiO. Chemical stability tests showed that the BZY-NiO anodic powders had good stability against CO₂, whereas comparative tests under the same conditions showed degradation for BaCe_0.7Zr_0.1Y_0.2O_3-∂- NiO, which is at present the most used anode material for proton-conducting …

Dithienothiophene (Dtt)-Based Dyes For Dye-Sensitized Solar Cells: Synthesis Of 2,6-Dibromo-Dtt, Tae-Hyuk Kwon, Vanessa Armel, Andrew Nattestad, Douglas R. Macfarlane, Udo Bach, Samuel J. Lind, Keith C. Gordon, Weihua Tang, David J. Jones, Andrew Holmes

Australian Institute for Innovative Materials - Papers

A one-pot synthesis of 2,6-dibromodithieno[3,2-b;2′,3′-d]thiophene (dibromo-DTT, 4) was developed. A key step was bromodecarboxylation of DTT-2,6-dicarboxylic acid, obtained by saponification of the diester 1. The donor-acceptor dye DAHTDTT (13), based on a central 2,6-bis[2′-(3′-hexylthienyl)]dithieno[3,2-b;2′,3′-d]thiophene core (9), was prepared and incorporated in a dye-sensitized solar cell (DSC), which exhibited an energy conversion efficiency of 7.3% with Voc of 697 mV, Jsc of 14.4 mA/cm2, and ff of 0.73 at 1 sun.

Cytotoxicity Of Cu(Ii) And Zn(Ii) 2,2′-Bipyridyl Complexes: Dependence Of Ic 50 On Recovery Time, Yi Shi, Bonnie B. Toms, Namrata Dixit, Jerry Goodisman, James C. Dabrowiak

Chemistry - All Scholarship

We measure the cytotoxicity of three metal complexes containing the 2,2′-bypyridine ligand, Cu(bpy)(NCS) ₂, 1, [Cu(bpy) ₂(H ₂O)](PF ₆) ₂, 2, and Zn(bpy) ₂(NCS) ₂, 3, toward neuroblastoma cells (SK-N-SH) and ovarian cancer cells (OVCAR-3) using two different cell assays. The cells were exposed to various concentrations of the compounds for 1 h and the percent inhibition of cell growth, I, measured for various times after exposure, i.e., as a function of the recovery time t. After developing the theory showing the relationship between I and t, the cytotoxicity data were analyzed to …

Periodic 2-Graphs Arising From Subshifts, David Pask, Iain Raeburn, Natasha A. Weaver

Faculty of Informatics - Papers (Archive)

Higher-rank graphs were introduced by Kumjian and Pask to provide models for higher-rank Cuntz– Krieger algebras. In a previous paper, we constructed 2 graphs whose path spaces are rank two subshifts of finite type, and showed that this construction yields aperiodic 2 graphs whose C algebras are simple and are not ordinary graph algebras. Here we show that the construction also gives a family of periodic 2 graphs which we call domino graphs. We investigate the combinatorial structure of domino graphs, finding interesting points of contact with the existing combinatorial literature, and prove a structure theorem for the C algebras …

Differential Endocytosis Of Tissue Plasminogen Activator By Serpins Pai-1 And Pai-2 On Human Peripheral Blood Monocytes, Jodi A. Lee, David Croucher, Marie Ranson

Faculty of Science - Papers (Archive)

Generation of the broad spectrum protease plasmin is facilitated by the tissue (t-PA) and urokinase (u-PA) plasminogen activators, within multiple physiological and disease states. Finely tuned control of this proteolytic cascade is exerted by the plasminogen activator inhibitors type-1 (PAI-1/SERPINE1) and 2 (PAI-2/SERPINB2). Expression of this network of activators and inhibitors by cells of myeloid lineage appears to be highly interchangeable between physiological environments, and whilst the role of PAI-1 and PAI-2 in regulating u-PA-dependent functions is well established, the interaction between t-PA and PAI-2 on these cell types is poorly characterised. To this end, we used freshly isolated peripheral …