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The potential use of electrochemically polymerized polycarbazole as an additive in lithium-sulfur battery cathodes has been investigated. Optimization of the polymer properties considered solvent, electrolyte and current-time profile during electropolymerization. It was found that electrodeposition from LiClO4-acetonitrile electrolyte and constant-potential deposition (at 1.15 V vs Ag/Ag+) gives the highest initial discharge capacity. This is most likely due to an optimum combination of specific surface area and conductivity. To improve the quality of the cathode, a slurry of carbon disulfide and dimethyl formamide was devised to balance the dispersion of carbon black and the solubility of sulfur. In 2032-coin cells, against a lithium anode, a polycarbazole-sulfur (PCBz-S) cathode with 30% sulphur showed the highest initial discharge capacity. A very good coulombic efficiency of around 98% and a capacity retention of over 91% for 50 charge/discharge cycles were obtained for the optimized PCBz-S cathode. Based on the cycling performance, PCBz is a potentially useful additive to mitigate the polysulfide shuttle effect. In addition, the electropolymerized carbazole matches the performance of a commercial polypyrrole that has been widely used as a conductive binder.
Mohammad Ramezanitaghartapeh; Anthony F. Hollenkamp; Mustafa Musameh; Peter J. Mahon. High capacity polycarbazole-sulfur cathode for use in lithium-sulfur batteries. Electrochimica Acta 2021, 391, 138898 .
AMA StyleMohammad Ramezanitaghartapeh, Anthony F. Hollenkamp, Mustafa Musameh, Peter J. Mahon. High capacity polycarbazole-sulfur cathode for use in lithium-sulfur batteries. Electrochimica Acta. 2021; 391 ():138898.
Chicago/Turabian StyleMohammad Ramezanitaghartapeh; Anthony F. Hollenkamp; Mustafa Musameh; Peter J. Mahon. 2021. "High capacity polycarbazole-sulfur cathode for use in lithium-sulfur batteries." Electrochimica Acta 391, no. : 138898.
The rapid growth, demand, and production of batteries to meet various emerging applications, such as electric vehicles and energy storage systems, will result in waste and disposal problems in the next few years as these batteries reach end-of-life. Battery reuse and recycling are becoming urgent worldwide priorities to protect the environment and address the increasing need for critical metals. As a review article, this paper reveals the current global battery market and global battery waste status from which the main battery chemistry types and their management, including reuse and recycling status, are discussed. This review then presents details of the challenges, opportunities, and arguments on battery second-life and recycling. The recent research and industrial activities in the battery reuse domain are summarized to provide a landscape picture and valuable insight into battery reuse and recycling for industries, scientific research, and waste management.
Yanyan Zhao; Oliver Pohl; Anand Bhatt; Gavin Collis; Peter Mahon; Thomas Rüther; Anthony Hollenkamp. A Review on Battery Market Trends, Second-Life Reuse, and Recycling. Sustainable Chemistry 2021, 2, 167 -205.
AMA StyleYanyan Zhao, Oliver Pohl, Anand Bhatt, Gavin Collis, Peter Mahon, Thomas Rüther, Anthony Hollenkamp. A Review on Battery Market Trends, Second-Life Reuse, and Recycling. Sustainable Chemistry. 2021; 2 (1):167-205.
Chicago/Turabian StyleYanyan Zhao; Oliver Pohl; Anand Bhatt; Gavin Collis; Peter Mahon; Thomas Rüther; Anthony Hollenkamp. 2021. "A Review on Battery Market Trends, Second-Life Reuse, and Recycling." Sustainable Chemistry 2, no. 1: 167-205.
A series of novel substituted-azo dyes 8-(aryldiazenyl)quinolin-5-ol (5a-i) were synthesized by the coupling reaction of 5-hydroxyquinoline with diazotized aniline derivatives in the presence of NaNO2 in HCl/H2O mixture. The study of the spectroscopic and solvatochromic properties were performed by FT-IR, 1H and 13C-NMR and UV-Visible spectroscopies. The tautomerism of these dyes was studied using the deuteration technique and solvatochromic measurements. Photochromic properties of these 5-hydroxyquinoline azo dyes were also examined via E/Z and Z/E photochemical isomerization reactions and compared with the existing 8-hydroxyquinoline analogous. The novel substituted-azo dyes exhibited higher Z/E thermal isomerization rates and have larger absorbance wavelength range than their 8-hydroxyquinoline analogous, making them potential molecular switches.
Hamid Rashidnejad; Mohammad Ramezanitaghartapeh; Nader Noroozi Pesyan; Peter J. Mahon; M. Manuela M. Raposo; Paulo J. Coelho; Andrew Ng Kay Lup; Alireza Soltani. A comprehensive spectroscopic, solvatochromic and photochemical analysis of 5-hydroxyquinoline and 8-hydroxyquinoline mono-azo dyes. Journal of Molecular Structure 2020, 1223, 129323 .
AMA StyleHamid Rashidnejad, Mohammad Ramezanitaghartapeh, Nader Noroozi Pesyan, Peter J. Mahon, M. Manuela M. Raposo, Paulo J. Coelho, Andrew Ng Kay Lup, Alireza Soltani. A comprehensive spectroscopic, solvatochromic and photochemical analysis of 5-hydroxyquinoline and 8-hydroxyquinoline mono-azo dyes. Journal of Molecular Structure. 2020; 1223 ():129323.
Chicago/Turabian StyleHamid Rashidnejad; Mohammad Ramezanitaghartapeh; Nader Noroozi Pesyan; Peter J. Mahon; M. Manuela M. Raposo; Paulo J. Coelho; Andrew Ng Kay Lup; Alireza Soltani. 2020. "A comprehensive spectroscopic, solvatochromic and photochemical analysis of 5-hydroxyquinoline and 8-hydroxyquinoline mono-azo dyes." Journal of Molecular Structure 1223, no. : 129323.
The mussel inspired polydopamine has acquired great relevance in the field of nanomedicines, owing to its incredible physicochemical properties. Polydopamine nanoparticles (PDA NPs) due to their low cytotoxicity, high biocompatibility and ready biodegradation have already been widely investigated in various drug delivery, chemotherapeutic, and diagnostic applications. In addition, owing to its highly reactive nature, it possesses a very high capability for loading drugs and chemotherapeutics. Therefore, the loading efficiency of PDA NPs for an antibiotic i.e., gentamicin (G) has been investigated in this work. For this purpose, an in-situ polymerization method was studied to load the drug into PDA NPs using variable drug: monomer ratios. Scanning electron microscope (SEM), Fourier-transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS) confirmed the successful loading of drug within PDA NPs, mainly via hydrogen bonding between the amine groups of gentamicin and the hydroxyl groups of PDA. The loading amount was quantified by liquid chromatography–mass spectrometry (LC-MS) and the highest percentage loading capacity was achieved for G-PDA prepared with drug to monomer ratio of 1:1. Moreover, the gentamicin loaded PDA NPs were tested in a preliminary antibacterial evaluation using the broth microdilution method against both Gram-(+) Staphylococcus aureus and Gram-(−) Pseudomonas aeruginosa microorganisms. The highest loaded G-PDA sample exhibited the lowest minimum inhibitory concentration and minimum bactericidal concentration values. The developed gentamicin loaded PDA is very promising for long term drug release and treating various microbial infections.
Rahila Batul; Mrinal Bhave; Peter J. Mahon; Aimin Yu. Polydopamine Nanosphere with In-Situ Loaded Gentamicin and Its Antimicrobial Activity. Molecules 2020, 25, 2090 .
AMA StyleRahila Batul, Mrinal Bhave, Peter J. Mahon, Aimin Yu. Polydopamine Nanosphere with In-Situ Loaded Gentamicin and Its Antimicrobial Activity. Molecules. 2020; 25 (9):2090.
Chicago/Turabian StyleRahila Batul; Mrinal Bhave; Peter J. Mahon; Aimin Yu. 2020. "Polydopamine Nanosphere with In-Situ Loaded Gentamicin and Its Antimicrobial Activity." Molecules 25, no. 9: 2090.
Over the past years, the development of electrochemical sensing platforms for the sensitive detection of drug molecules have received great interests. In this research study, we introduced cauliflower‐like platinum particles decorated reduced graphene oxide modified glassy carbon electrode (Pt−RGO/GCE) as an electrochemical sensing platform for highly sensitive determination of acetaminophen (ACTM). The sensor was prepared via a simple and environmentally friendly two‐step electrodeposition method at room temperature. The combination of conductive RGO nanosheets and unique structured Pt particles (average 232 nm in diameter) provided an efficient interface with large effective surface area which greatly facilitated the electron transfer of ACTM. The experimental conditions that might affect the drug detection were studied in detail and optimized for best performance. The Pt−RGO/GCE was able to detect ACTM up to the limit of 2.2 nM with a linear concentration range from 0.01 to 350 μM. With its high reproducibility, excellent stability and selectivity, the as‐fabricated sensor was successfully applied to the ACTM content measurement in commercial tablets.
Tien Song Hiep Pham; Peter Mahon; Guosong Lai; Li Fu; Cheng-Te Lin; Aimin Yu. Cauliflower‐like Platinum Particles Decorated Reduced Graphene Oxide for Sensitive Determination of Acetaminophen. Electroanalysis 2019, 31, 1758 -1768.
AMA StyleTien Song Hiep Pham, Peter Mahon, Guosong Lai, Li Fu, Cheng-Te Lin, Aimin Yu. Cauliflower‐like Platinum Particles Decorated Reduced Graphene Oxide for Sensitive Determination of Acetaminophen. Electroanalysis. 2019; 31 (9):1758-1768.
Chicago/Turabian StyleTien Song Hiep Pham; Peter Mahon; Guosong Lai; Li Fu; Cheng-Te Lin; Aimin Yu. 2019. "Cauliflower‐like Platinum Particles Decorated Reduced Graphene Oxide for Sensitive Determination of Acetaminophen." Electroanalysis 31, no. 9: 1758-1768.
Black pepper is one of the common spices used in foods as a favoring agent. Their utilization is diversified into other applications such as pepper spray for defense, medicine for healthcare and pest control in the agriculture sector. In order to meet the industry demand, various countries with a suitable tropical climate have grown black pepper as one of their export commodities. Indirectly, reputation and quality of the black pepper are associated with the growth origin as the soil quality, handling processes, and growing environment will influence the final grade of the black pepper. Geographical origin has become one of the parameters in determining the price of the pepper. In view of this, there is a pressing demand to have a standard to identify the growth origin of black pepper to avoid counterfeit issues with the intention to scope for higher market price. This paper reports an attempt to determine the growth origin of black pepper (Piper nigrum L.) based on the volatile organic compounds (VOCs) profile recorded using high resolution gas chromatography mass spectrometry system. In this work, black peppers from two different countries of origin; namely from Malaysia and India were selected as a case study. A total of 252 of black pepper samples from these two origins were extracted for non-polar compounds using a standard method and the VOCs profiles were then subjected to Principal Component Analysis (PCA) and Fold Change Analysis. PCA cluster plots showed that Indian and Malaysian black pepper can be confidently discriminated by means of unique non-polar compounds present in the pepper samples.
Zehnder J. A. Mercer; Hong Siang Chua; Peter Mahon; Siaw San Hwang; Sing Muk Ng. Authentication of geographical growth origin of black pepper (piper nigrum l.) based on volatile organic compounds profile: A case study for Malaysia and India black peppers. 2019 IEEE International Symposium on Olfaction and Electronic Nose (ISOEN) 2019, 1 -3.
AMA StyleZehnder J. A. Mercer, Hong Siang Chua, Peter Mahon, Siaw San Hwang, Sing Muk Ng. Authentication of geographical growth origin of black pepper (piper nigrum l.) based on volatile organic compounds profile: A case study for Malaysia and India black peppers. 2019 IEEE International Symposium on Olfaction and Electronic Nose (ISOEN). 2019; ():1-3.
Chicago/Turabian StyleZehnder J. A. Mercer; Hong Siang Chua; Peter Mahon; Siaw San Hwang; Sing Muk Ng. 2019. "Authentication of geographical growth origin of black pepper (piper nigrum l.) based on volatile organic compounds profile: A case study for Malaysia and India black peppers." 2019 IEEE International Symposium on Olfaction and Electronic Nose (ISOEN) , no. : 1-3.
In this study, a density functional theory (DFT) calculation was carried out for the adsorption behavior and detection of metformin on the exterior surfaces of pure and doped boron nitride (BN) fullerenes by using B3LYP-D and PW91-D functionals. The results demonstrate that the NH group of metformin can chemisorb on the boron atom of B12N12 and B16N16 fullerenes. Presence of polar solvent (water) increases the adsorption energy of metformin on the pure and GaB11N12 fullerenes. However, at the presence of Ga doping and it was found that the doping increases the binding energy of the metformin molecule, while the Ge doping decreases the binding energy. So our calculations suggest that the GeB11N12 has a greater sensitivity for the metformin molecule compared with the GaB11N12 fullerene. Our results represented that the GeB11N12 fullerene has good potential as a biosensor for the determination of metformin in environmental systems.
A.S. Ghasemi; Mohammad Ramezani Taghartapeh; Alireza Soltani; Peter Mahon. Adsorption behavior of metformin drug on boron nitride fullerenes: Thermodynamics and DFT studies. Journal of Molecular Liquids 2018, 275, 955 -967.
AMA StyleA.S. Ghasemi, Mohammad Ramezani Taghartapeh, Alireza Soltani, Peter Mahon. Adsorption behavior of metformin drug on boron nitride fullerenes: Thermodynamics and DFT studies. Journal of Molecular Liquids. 2018; 275 ():955-967.
Chicago/Turabian StyleA.S. Ghasemi; Mohammad Ramezani Taghartapeh; Alireza Soltani; Peter Mahon. 2018. "Adsorption behavior of metformin drug on boron nitride fullerenes: Thermodynamics and DFT studies." Journal of Molecular Liquids 275, no. : 955-967.
The present work reports the adsorption of serine in the neutral and zwitterionic forms on the pure and Pt-decorated B12N12 fullerenes by means of density functional theory (DFT) and time-dependent density functional theory (TD-DFT) calculations. The binding energy of serine over the fullerene has been studied through its hydroxyl (-OH), carboxyl (-COOH), and amine (-NH2) functional groups. Based on our analysis, the binding energy of serine in zwitterionic form (F: −1.52 eV) on B12N12 fullerene is less stable than that of the neutral form (C: −1.61 eV) using the M06-2X functional. Our results indicated that the most stable chemisorption state for serine is through its amine group (I: −2.49 eV) interacting with the Pt-decorated B12N12 fullerene in comparison with the carbonyl group (J: −1.92 eV). The conductivity of the B12N12 and Pt-decorated B12N12 fullerenes is influenced by the energy band gap variation when serine is adsorbed upon the outer surface of fullerenes. Understanding the adsorption of serine on B12N12 and Pt-decorated B12N12 fullerenes provide fundamental knowledge for future applications in biomolecules and metal surfaces.
Alireza Soltani; Mohammad Ramezani Taghartapeh; Vahid Erfani-Moghadam; Masoud Bezi Javan; Fatemeh Heidari; Mehrdad Aghaei; Peter Mahon. Serine adsorption through different functionalities on the B12N12 and Pt-B12N12 nanocages. Materials Science and Engineering: C 2018, 92, 216 -227.
AMA StyleAlireza Soltani, Mohammad Ramezani Taghartapeh, Vahid Erfani-Moghadam, Masoud Bezi Javan, Fatemeh Heidari, Mehrdad Aghaei, Peter Mahon. Serine adsorption through different functionalities on the B12N12 and Pt-B12N12 nanocages. Materials Science and Engineering: C. 2018; 92 ():216-227.
Chicago/Turabian StyleAlireza Soltani; Mohammad Ramezani Taghartapeh; Vahid Erfani-Moghadam; Masoud Bezi Javan; Fatemeh Heidari; Mehrdad Aghaei; Peter Mahon. 2018. "Serine adsorption through different functionalities on the B12N12 and Pt-B12N12 nanocages." Materials Science and Engineering: C 92, no. : 216-227.
The synthesis of novel nanocomposites with great sensing enhancement has played an important role in analytical chemistry, especially in the electrochemical detection of drug molecules. In this work, we report a wet chemical method for the preparation of a gold nanoparticle coated β‐cyclodextrin functionalized reduced graphene oxide nanocomposite. A number of different analytical techniques including ultraviolet‐visible spectroscopy, fourier transform infrared spectroscopy, scanning electron microscope and energy dispersive X‐ray spectroscopy were employed to characterize the as‐synthesized nanocomposite. With excellent electrocatalytic properties and high supramolecular recognition ability, the as‐synthesized nanocomposite was used to modify a glassy carbon electrode surface for the sensitive determination of ciprofloxacin using voltammetric technique. The current response of ciprofloxacin on the nanocomposite modified electrode was greatly enhanced compared to that on the bare and other modified electrodes. Using differential pulse voltammetry, the oxidation peak currents increased linearly with the ciprofloxacin concentrations in the range between 0.01 to 120 μM with a detection limit of 2.7 nM. The electrochemical testing results showed good stability and reproducibility. Therefore, the nanocomposite could be a potential candidate for the development of electrochemical sensors for sensitive and selective determination of ciprofloxacin or similar drugs in the future.
Tien Song Hiep Pham; Peter Mahon; Guosong Lai; Aimin Yu. Reduced Graphene Oxide Nanocomposite Modified Electrodes for Sensitive Detection of Ciprofloxacin. Electroanalysis 2018, 30, 2185 -2194.
AMA StyleTien Song Hiep Pham, Peter Mahon, Guosong Lai, Aimin Yu. Reduced Graphene Oxide Nanocomposite Modified Electrodes for Sensitive Detection of Ciprofloxacin. Electroanalysis. 2018; 30 (9):2185-2194.
Chicago/Turabian StyleTien Song Hiep Pham; Peter Mahon; Guosong Lai; Aimin Yu. 2018. "Reduced Graphene Oxide Nanocomposite Modified Electrodes for Sensitive Detection of Ciprofloxacin." Electroanalysis 30, no. 9: 2185-2194.
Alireza Soltani; Mohammad Ramezani Taghartapeh; Masoud Bezi Javan; Peter Mahon; Zivar Azmoodeh; E. Tazikeh Lemeski; Iwan Kityk. Theoretical studies of hydrazine detection by pure and Al defected MgO nanotubes. Physica E: Low-dimensional Systems and Nanostructures 2018, 97, 239 -249.
AMA StyleAlireza Soltani, Mohammad Ramezani Taghartapeh, Masoud Bezi Javan, Peter Mahon, Zivar Azmoodeh, E. Tazikeh Lemeski, Iwan Kityk. Theoretical studies of hydrazine detection by pure and Al defected MgO nanotubes. Physica E: Low-dimensional Systems and Nanostructures. 2018; 97 ():239-249.
Chicago/Turabian StyleAlireza Soltani; Mohammad Ramezani Taghartapeh; Masoud Bezi Javan; Peter Mahon; Zivar Azmoodeh; E. Tazikeh Lemeski; Iwan Kityk. 2018. "Theoretical studies of hydrazine detection by pure and Al defected MgO nanotubes." Physica E: Low-dimensional Systems and Nanostructures 97, no. : 239-249.
It is often useful to transform a measured signal into a form that is more easily interpreted. Thus, in voltammetry, where the measurement is of a current responding to a perturbation of the electrode potential, the complications arising from diffusional transport may be readily alleviated through the use of semioperators or convolutions. The use of semiintegration enables the voltammetric current to be transformed into an alternative signal that, in the case of a planar electrode, is linearly related to the concentrations of reactant and product at the electrode surface. Numerous advantages of semiintegration have been widely demonstrated. However, semiintegration is but a special case of the more general procedure of convolution. Convolving the voltammetric current with specifically designed functions of time allows the benefits of semiintegration to be applied to other electrode geometries and other experimental circumstances. The prime motive for semiintegration or convolution is to gain access to information about concentrations at the electrode surface. This information opens the door to the measurement of such quantities as bulk concentrations, rate constants, standard potentials, and diffusivities, as well as suggesting mechanisms and enabling the calibration of electrodes.
Peter J. Mahon; Keith B. Oldham. Semioperations and Convolutions in Voltammetry. ChemElectroChem 2018, 5, 839 -848.
AMA StylePeter J. Mahon, Keith B. Oldham. Semioperations and Convolutions in Voltammetry. ChemElectroChem. 2018; 5 (6):839-848.
Chicago/Turabian StylePeter J. Mahon; Keith B. Oldham. 2018. "Semioperations and Convolutions in Voltammetry." ChemElectroChem 5, no. 6: 839-848.
The wings of insects such as cicadas and dragonflies have been found to possess nanostructure arrays that are assembled from fatty acids. These arrays can physically interact with the bacterial cell membranes, leading to the death of the cell. Such mechanobactericidal surfaces are of significant interest, as they can kill bacteria without the need for antibacterial chemicals. Here, we report on the bactericidal effect of two of the main lipid components of the insect wing epicuticle, palmitic (C16) and stearic (C18) fatty acids. Films of these fatty acids were re-crystallised on the surface of highly ordered pyrolytic graphite. It appeared that the presence of two additional CH2 groups in the alkyl chain resulted in the formation of different surface structures. Scanning electron microscopy and atomic force microscopy showed that the palmitic acid microcrystallites were more asymmetric than those of the stearic acid, where the palmitic acid microcrystallites were observed to be an angular abutment in the scanning electron micrographs. The principal differences between the two types of long-chain saturated fatty acid crystallites were the larger density of peaks in the upper contact plane of the palmitic acid crystallites, as well as their greater proportion of asymmetrical shapes, in comparison to that of the stearic acid film. These two parameters might contribute to higher bactericidal activity on surfaces derived from palmitic acid. Both the palmitic and stearic acid crystallite surfaces displayed activity against Gram-negative, rod-shaped Pseudomonas aeruginosa and Gram-positive, spherical Staphylococcus aureus cells. These microcrystallite interfaces might be a useful tool in the fabrication of effective bactericidal nanocoatings. Nanostructured cicada and dragonfly wing surfaces have been discovered to be able physically kill bacterial cells. Here, we report on the successful fabrication of bactericidal three-dimensional structures of two main lipid components of the epicuticle of insect wings, palmitic (C16) and stearic (C18) acids. After crystallisation onto highly ordered pyrolytic graphite, both the palmitic and stearic acid films displayed bactericidal activity against both Gram-negative Pseudomonas aeruginosa and Gram-positive Staphylococcus aureus cells. The simplicity of the production of these microcrystallite interfaces suggests that a fabrication technique, based on solution deposition, could be an effective technique for the application of bactericidal nanocoatings.
Elena P. Ivanova; Song Ha Nguyen; Yachong Guo; Vladimir Baulin; Hayden Webb; Vi Khanh Truong; Jason V. Wandiyanto; Christopher J. Garvey; Peter Mahon; David E. Mainwaring; Russell J. Crawford. Bactericidal activity of self-assembled palmitic and stearic fatty acid crystals on highly ordered pyrolytic graphite. Acta Biomaterialia 2017, 59, 148 -157.
AMA StyleElena P. Ivanova, Song Ha Nguyen, Yachong Guo, Vladimir Baulin, Hayden Webb, Vi Khanh Truong, Jason V. Wandiyanto, Christopher J. Garvey, Peter Mahon, David E. Mainwaring, Russell J. Crawford. Bactericidal activity of self-assembled palmitic and stearic fatty acid crystals on highly ordered pyrolytic graphite. Acta Biomaterialia. 2017; 59 ():148-157.
Chicago/Turabian StyleElena P. Ivanova; Song Ha Nguyen; Yachong Guo; Vladimir Baulin; Hayden Webb; Vi Khanh Truong; Jason V. Wandiyanto; Christopher J. Garvey; Peter Mahon; David E. Mainwaring; Russell J. Crawford. 2017. "Bactericidal activity of self-assembled palmitic and stearic fatty acid crystals on highly ordered pyrolytic graphite." Acta Biomaterialia 59, no. : 148-157.
High performance liquid chromatography coupled with post column derivatisation (HPLC-PCD) may be used to profile the antioxidant content of a sample. There are, however, drawbacks in the use of HPLC-PCD setups; namely the high volume reaction coils that are typically used lowering the observed separation efficiency. Reaction flow chromatography has the ability to overcome these inefficiencies by using a more efficient mixing technique inside the outlet fitting itself, post column reaction loops can be removed with resulting improvement in signal to noise response, plus the separation efficiency is maintained. We assessed two methods of HPLC-PCD antioxidant analysis based on the ferric reducing antioxidant power (FRAP) assay in both conventional and reaction flow HPLC-PCD modes. It was found that the reaction flow technique demonstrated significant advantages over the conventional technique in terms of signal to noise, linear range, precision and observed separation efficiency.
A. Jones; S. Pravadali-Cekic; G.R. Dennis; R. Bashir; Peter Mahon; R.A. Shalliker. Ferric reducing antioxidant potential (FRAP) of antioxidants using reaction flow chromatography. Analytica Chimica Acta 2017, 967, 93 -101.
AMA StyleA. Jones, S. Pravadali-Cekic, G.R. Dennis, R. Bashir, Peter Mahon, R.A. Shalliker. Ferric reducing antioxidant potential (FRAP) of antioxidants using reaction flow chromatography. Analytica Chimica Acta. 2017; 967 ():93-101.
Chicago/Turabian StyleA. Jones; S. Pravadali-Cekic; G.R. Dennis; R. Bashir; Peter Mahon; R.A. Shalliker. 2017. "Ferric reducing antioxidant potential (FRAP) of antioxidants using reaction flow chromatography." Analytica Chimica Acta 967, no. : 93-101.
Two new antimicrobial agents, neryl ferulate (1) and neryl p-coumarate (2), were identified using bioassay-guided isolation from the leaves of Eremophila longifolia, which is a medicinal plant used by some Australian Aboriginal communities. Although gradual autoxidation of the nerol subunit hindered the initial attempts to purify and characterize 1 and 2, it was found that the autoxidation could be stopped through storage under argon at -20 °C. Biological evaluation showed that neryl ferulate (1) had moderate activity against various Gram-positive bacteria, while neryl p-coumarate (2) was active only against Enterococcus faecium.
Savithri Galappathie; David J. Edwards; Alysha G. Elliott; Matthew A. Cooper; Enzo A. Palombo; Mark S. Butler; Peter J. Mahon. Antibacterial Nerol Cinnamates from the Australian Plant Eremophila longifolia. Journal of Natural Products 2017, 80, 1178 -1181.
AMA StyleSavithri Galappathie, David J. Edwards, Alysha G. Elliott, Matthew A. Cooper, Enzo A. Palombo, Mark S. Butler, Peter J. Mahon. Antibacterial Nerol Cinnamates from the Australian Plant Eremophila longifolia. Journal of Natural Products. 2017; 80 (4):1178-1181.
Chicago/Turabian StyleSavithri Galappathie; David J. Edwards; Alysha G. Elliott; Matthew A. Cooper; Enzo A. Palombo; Mark S. Butler; Peter J. Mahon. 2017. "Antibacterial Nerol Cinnamates from the Australian Plant Eremophila longifolia." Journal of Natural Products 80, no. 4: 1178-1181.
Marzieh Barghamadi; Adam S. Best; Anthony F. Hollenkamp; Peter Mahon; Mustafa Musameh; Thomas Rüther. Optimising the concentration of LiNO3 additive in C4mpyr-TFSI electrolyte-based Li-S battery. Electrochimica Acta 2016, 222, 257 -263.
AMA StyleMarzieh Barghamadi, Adam S. Best, Anthony F. Hollenkamp, Peter Mahon, Mustafa Musameh, Thomas Rüther. Optimising the concentration of LiNO3 additive in C4mpyr-TFSI electrolyte-based Li-S battery. Electrochimica Acta. 2016; 222 ():257-263.
Chicago/Turabian StyleMarzieh Barghamadi; Adam S. Best; Anthony F. Hollenkamp; Peter Mahon; Mustafa Musameh; Thomas Rüther. 2016. "Optimising the concentration of LiNO3 additive in C4mpyr-TFSI electrolyte-based Li-S battery." Electrochimica Acta 222, no. : 257-263.
Utilization of permselective membranes holds tremendous promise for retention of the electrode active material in electrochemical devices which suffer from electrode instability issues. In rechargeable Li-S battery- a strong contender to outperform the Li-ion technology- migration of lithium polysulfides from the sulfur cathode has been linked to rapid capacity fading and lower Coulombic efficiency. However, the current approaches for configuring Li-S cells with permselective membranes suffer from large ohmic polarization resulting in low capacity and poor rate capability. To overcome these issues, we report the facile fabrication of a high flux graphene oxide membrane directly onto the sulfur cathode by shear alignment of discotic nematic liquid crystals of graphene oxide (GO). In conjunction with a carbon coated separator, the highly ordered structure of the thin (~ 0.75 µm) membrane and its inherent surface charge retains majority of the polysulfides, enabling the cells to deliver unprecedented high initial discharge capacities of 1063 mAh g-1electrode and 1182 mAh g-1 electrode for electrodes with 70 % and 80 % sulfur content, respectively at the practical 0.5 C rate. The very high sulfur utilization and impressive capacity retentions of the high sulfur content electrodes results in some of the highest performance metrics in the literature of Li-S (e.g., electrode capacity of 835 mAh g-1electrode after 100 cycles at 0.5 C with a sulfur content of 80%). We show that the structural order of the shear-aligned GO membrane is key in maintaining good kinetics of the charge transfer processes in Li-S battery.
Mahdokht Shaibani; Abozar Akbari; Phillip Sheath; Christopher Easton; Parama Chakraborty Banerjee; Kristina Konstas; Armaghan Fakhfouri; Marzieh Barghamadi; Mustafa M. Musameh; Adam S. Best; Thomas Rüther; Peter Mahon; Matthew Hill; Anthony F. Hollenkamp; Mainak Majumder. Suppressed Polysulfide Crossover in Li–S Batteries through a High-Flux Graphene Oxide Membrane Supported on a Sulfur Cathode. ACS Nano 2016, 10, 7768 -7779.
AMA StyleMahdokht Shaibani, Abozar Akbari, Phillip Sheath, Christopher Easton, Parama Chakraborty Banerjee, Kristina Konstas, Armaghan Fakhfouri, Marzieh Barghamadi, Mustafa M. Musameh, Adam S. Best, Thomas Rüther, Peter Mahon, Matthew Hill, Anthony F. Hollenkamp, Mainak Majumder. Suppressed Polysulfide Crossover in Li–S Batteries through a High-Flux Graphene Oxide Membrane Supported on a Sulfur Cathode. ACS Nano. 2016; 10 (8):7768-7779.
Chicago/Turabian StyleMahdokht Shaibani; Abozar Akbari; Phillip Sheath; Christopher Easton; Parama Chakraborty Banerjee; Kristina Konstas; Armaghan Fakhfouri; Marzieh Barghamadi; Mustafa M. Musameh; Adam S. Best; Thomas Rüther; Peter Mahon; Matthew Hill; Anthony F. Hollenkamp; Mainak Majumder. 2016. "Suppressed Polysulfide Crossover in Li–S Batteries through a High-Flux Graphene Oxide Membrane Supported on a Sulfur Cathode." ACS Nano 10, no. 8: 7768-7779.
We reported a graphene-based electrochemical sensor for sensitively measuring carbendazim, which is one of the effective benzimidazole fungicides popularly used in agriculture. The β-cyclodextrin-functionalized reduced graphene oxide (β-CD–RGO) nanocomposites were synthesized using hydrazine as the reducing agent at room temperature. The as-synthesized nanocomposites were characterized using different analytical methods including UV–visible spectroscopy and Fourier transform infrared spectroscopy. The nanocomposites with a combination of physicochemical properties of RGO and high molecular recognition capability of β-CD were used to modify the surface of a glassy carbon electrode for the electrochemical determination of the drug carbendazim using cyclic voltammetry and differential pulse voltammetry. The current responses of carbendazim on the β-CD–RGO-modified electrode were greatly enhanced compared to that on the bare electrode due to the electrocatalytic effect of β-CD–RGO. It was found that the peak currents increased linearly with the carbendazim concentration in the range between 0.1 and 40 μM. The obtained results suggest that β-CD–RGO composite could be a potential candidate for the preparation of effective electrochemical sensors for carbendazim or similar drugs in the future.
Tien Song Hiep Pham; Li Fu; Peter Mahon; Guosong Lai; Aimin Yu. Fabrication of β-Cyclodextrin-Functionalized Reduced Graphene Oxide and Its Application for Electrocatalytic Detection of Carbendazim. Electrocatalysis 2016, 7, 411 -419.
AMA StyleTien Song Hiep Pham, Li Fu, Peter Mahon, Guosong Lai, Aimin Yu. Fabrication of β-Cyclodextrin-Functionalized Reduced Graphene Oxide and Its Application for Electrocatalytic Detection of Carbendazim. Electrocatalysis. 2016; 7 (5):411-419.
Chicago/Turabian StyleTien Song Hiep Pham; Li Fu; Peter Mahon; Guosong Lai; Aimin Yu. 2016. "Fabrication of β-Cyclodextrin-Functionalized Reduced Graphene Oxide and Its Application for Electrocatalytic Detection of Carbendazim." Electrocatalysis 7, no. 5: 411-419.
The electrochemical behavior of iodine remains a contemporary research interest due to the integral role of the I‒/I3‒ couple in dye-sensitized solar cell technology. The neutral (I2) and positive (I+) oxidation states of iodine are known to be strongly electrophilic, and thus the I‒/I2/I+ redox processes are sensitive to the presence of nucleophilic chloride or bromide, which are both commonly present as impurities in nonhaloaluminate room temperature ionic liquids (ILs). In this study, the electrochemistry of I‒, I2 and ICl has been investigated by cyclic voltammetry at a platinum macrodisk electrode in a binary IL mixture composed of 1-butyl-3-methylimidazolium chloride ([C4mim]Cl) and 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide ([C2mim][NTf2]). In the absence of chloride (e.g., in neat [C2mim][NTf2]), I‒ is oxidized in an overall 1-electron per iodide ion process to I2 via an I3‒ intermediate, giving rise to two resolved I‒/I3‒ and I3‒/I2 processes, as per previous reports. In the presence of low concentrations of chloride ([Cl‒] and [I‒] are both < 30 mM), an additional oxidation process appears at potentials less positive than the I3‒/I2 process, which corresponds to the oxidation of I3‒ to the interhalide complex anion [ICl2]‒, in an overall 2-electron per iodide ion process. In the presence of a large excess of Cl‒ ([I‒] ≈ 10 mM and [Cl‒] ≈ 3.7 M), I‒ is oxidized in an overall 2-electron per iodide ion process to [ICl2]‒ via an [I2Cl]‒ intermediate (confirmed by investigating the voltammetric response of ICl and I2 under these conditions). In summary, the I‒/I2/I+ processes in nonhaloaluminate ILs involve a complicated interplay between multiple electron transfer pathways and homogeneous chemical reactions which may not be at equilibrium on the voltammetric timescale.
Cameron Luke Bentley; Alan M. Bond; Anthony F. Hollenkamp; Peter John Mahon; Jie Zhang. Electrochemistry of Iodide, Iodine, and Iodine Monochloride in Chloride Containing Nonhaloaluminate Ionic Liquids. Analytical Chemistry 2016, 88, 1915 -1921.
AMA StyleCameron Luke Bentley, Alan M. Bond, Anthony F. Hollenkamp, Peter John Mahon, Jie Zhang. Electrochemistry of Iodide, Iodine, and Iodine Monochloride in Chloride Containing Nonhaloaluminate Ionic Liquids. Analytical Chemistry. 2016; 88 (3):1915-1921.
Chicago/Turabian StyleCameron Luke Bentley; Alan M. Bond; Anthony F. Hollenkamp; Peter John Mahon; Jie Zhang. 2016. "Electrochemistry of Iodide, Iodine, and Iodine Monochloride in Chloride Containing Nonhaloaluminate Ionic Liquids." Analytical Chemistry 88, no. 3: 1915-1921.
The lithium-sulfur (Li-S) battery in which the ionic liquid (IL) C4mpyr-TFSI is a major component of the electrolyte has attracted much attention by researchers due to the ability of the IL to suppress the polysulfide shuttle effect, combined with advantageous properties of thermal, chemical and electrochemical stability. In a largely parallel stream of research, LiNO3 has come to be known as an additive for improving Li-S battery performance through its influence on protecting the lithium anode and beneficial interaction with the polysulfide shuttle. In this work a deeper understanding is sought of the combined effects of LiNO3 and C4mpyr-TFSI on the factors that impact Li-S cell performance. Specifically, we investigate the formation of the protective surface film on lithium anode and results are compared with those for a typical organic electrolyte for the Li-S battery, DOL:DME. Electrochemical impedance spectroscopy (EIS) confirms that the LiNO3 additive is vital to achieving acceptable levels of performance with the organic electrolyte. Although LiNO3 improves the performance of a battery assembled with IL containing electrolyte, it shows a higher impact in the organic electrolyte based battery. Furthermore X-ray photoelectron spectroscopy (XPS) spectra confirm the participation of C4mpyr-TFSI on the formation of the interphase layer on the anode
Marzieh Barghamadi; Adam S. Best; Anand I. Bhatt; Anthony Hollenkamp; Peter Mahon; Mustafa Musameh; Thomas Rüther. Effect of LiNO3 additive and pyrrolidinium ionic liquid on the solid electrolyte interphase in the lithium–sulfur battery. Journal of Power Sources 2015, 295, 212 -220.
AMA StyleMarzieh Barghamadi, Adam S. Best, Anand I. Bhatt, Anthony Hollenkamp, Peter Mahon, Mustafa Musameh, Thomas Rüther. Effect of LiNO3 additive and pyrrolidinium ionic liquid on the solid electrolyte interphase in the lithium–sulfur battery. Journal of Power Sources. 2015; 295 ():212-220.
Chicago/Turabian StyleMarzieh Barghamadi; Adam S. Best; Anand I. Bhatt; Anthony Hollenkamp; Peter Mahon; Mustafa Musameh; Thomas Rüther. 2015. "Effect of LiNO3 additive and pyrrolidinium ionic liquid on the solid electrolyte interphase in the lithium–sulfur battery." Journal of Power Sources 295, no. : 212-220.
The electrochemical behaviour and electrical performance are investigated for a series of lithium-sulfur (Li-S) cells in which the electrolyte solutions are organic solvent-ionic liquid mixtures that are based on the 1-butyl-1-methylpyrrolidinium (C4mpyr) cation with a range of anions. In each case, performance is compared with cells that are based on a standard mixed-ether organic electrolyte. The capacity of cells assembled with electrolytes containing 1-butyl-1-methylpyrrolidinium tris(pentafluoroethyl) trifluorophosphate (C4mpyr-FAP), 1-butyl-1-methylpyrrolidinium trifluoromethanesulfonate (C4mpyr-OTf), or 1-butyl-1-methylpyrrolidinium tricyanomethanide (C4mpyr-TCM) decline rapidly due to low conductivity, high polysulfide solubility and side reaction of electrolyte with electrodes, respectively. Our results confirm that polysulfide solubility is strongly controlled by the anion of the ionic liquid and verify that not all ionic liquids decrease polysulfide solubility. In agreement with previous reports, 1-butyl-1-methylpyrrolidinium bis(trifluoromethanesulfonyl) imide (C4mpyr-TFSI) shows the best compatibility in Li-S batteries and has a higher coulombic efficiency of greater than 99% over 100 cycles. Furthermore, impedance spectroscopy confirms that electrolyte composition influences the SEI layer formed on the lithium anode and its subsequent impedance
Marzieh Barghamadi; Adam S. Best; Anand I. Bhatt; Anthony Hollenkamp; Peter Mahon; Mustafa Musameh; Thomas Ruether. Effect of Anion on Behaviour of Li-S Battery Electrolyte Solutions Based on N-Methyl-N-Butyl-Pyrrolidinium Ionic Liquids. Electrochimica Acta 2015, 180, 636 -644.
AMA StyleMarzieh Barghamadi, Adam S. Best, Anand I. Bhatt, Anthony Hollenkamp, Peter Mahon, Mustafa Musameh, Thomas Ruether. Effect of Anion on Behaviour of Li-S Battery Electrolyte Solutions Based on N-Methyl-N-Butyl-Pyrrolidinium Ionic Liquids. Electrochimica Acta. 2015; 180 ():636-644.
Chicago/Turabian StyleMarzieh Barghamadi; Adam S. Best; Anand I. Bhatt; Anthony Hollenkamp; Peter Mahon; Mustafa Musameh; Thomas Ruether. 2015. "Effect of Anion on Behaviour of Li-S Battery Electrolyte Solutions Based on N-Methyl-N-Butyl-Pyrrolidinium Ionic Liquids." Electrochimica Acta 180, no. : 636-644.