Publications
271 results found
Hu S, Chen S, Menzel R, et al., 2014, Aqueous dispersions of oligomer-grafted carbon nanomaterials with controlled surface charge and minimal framework damage, FARADAY DISCUSSIONS, Vol: 173, Pages: 273-285, ISSN: 1359-6640
Illy BN, Ingham B, Toney MF, et al., 2014, Understanding the Selective Etching of Electrodeposited ZnO Nanorods, LANGMUIR, Vol: 30, Pages: 14079-14085, ISSN: 0743-7463
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- Citations: 15
Ramadan AJ, Rochford LA, Keeble DS, et al., 2014, Exploring High Temperature Templating in Non-planar Phthalocyanine / Copper Iodide (111) Bilayers, Journal of Materials Chemistry C, ISSN: 2050-7526
Elevated substrate temperature growth of phthalocyanine thin films is known to influence film morphology and increase crystallinity. Structural templating offers another method through which the structure of phthalocyanine films can be controlled. Here we combine the use of copper iodide (CuI) and elevated substrate temperatures and investigate their effect on the growth of a non-planar phthalocyanine system. Employing x-ray diffraction and atomic force microscopy we present detailed surface and crystal structure information. Vanadyl phthalocyanine (VOPc) is shown to adopt an edge-on orientation on CuI at ambient substrate temperatures, a behavior in stark contrast to that of previously studied planar phthalocyanine molecules. Elevated substrate temperature is shown to result in changes in the surface morphology and structure demonstrating the versatility of the system. The crystal structure of VOPc was redetermined and used to infer the molecular orientation of the various VOPc/CuI bilayer structures.
Royce SG, Mukherjee D, Cai T, et al., 2014, Modeling population exposures to silver nanoparticles present in consumer products, JOURNAL OF NANOPARTICLE RESEARCH, Vol: 16, ISSN: 1388-0764
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- Citations: 18
Mukherjee D, Royce SG, Sarkar S, et al., 2014, Modeling in vitro cellular responses to silver nanoparticles, Journal of Toxicology, Vol: 2014, ISSN: 1687-8205
Engineered nanoparticles (NPs) have been widely demonstrated to induce toxic effects to various cell types. In vitro cell exposure systems have high potential for reliable, high throughput screening of nanoparticle toxicity, allowing focusing on particular pathways while excluding unwanted effects due to other cells or tissue dosimetry. The work presented here involves a detailed biologically based computational model of cellular interactions with NPs; it utilizes measurements performed in human cell culture systems in vitro, to develop a mechanistic mathematical model that can support analysis and prediction of in vivo effects of NPs. The model considers basic cellular mechanisms including proliferation, apoptosis, and production of cytokines in response to NPs. This new model is implemented for macrophages and parameterized using in vitro measurements of changes in cellular viability and mRNA levels of cytokines: TNF, IL-1b, IL-6, IL-8, and IL-10. The model includes in vitro cellular dosimetry due to nanoparticle transport and transformation. Furthermore, the model developed here optimizes the essential cellular parameters based on in vitro measurements, and provides a "stepping stone" for the development of more advanced in vivo models that will incorporate additional cellular and NP interactions.
Teo GY, Ryan MP, Riley DJ, 2014, A mechanistic study on templated electrodeposition of one-dimensional TiO<sub>2</sub> nanorods and nanotubes using TiOSO<sub>4</sub> as a precursor, ELECTROCHEMISTRY COMMUNICATIONS, Vol: 47, Pages: 13-16, ISSN: 1388-2481
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- Citations: 10
van Veelen A, Preedy O, Qi J, et al., 2014, Uranium and technetium interactions with wustite [Fe<sub>1-<i>x</i></sub>O] and portlandite [Ca(OH)<sub>2</sub>] surfaces under geological disposal facility conditions, MINERALOGICAL MAGAZINE, Vol: 78, Pages: 1097-1113, ISSN: 0026-461X
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- Citations: 6
Mukherjee D, Leo BF, Royce SG, et al., 2014, Modeling physicochemical interactions affecting in vitro cellular dosimetry of engineered nanomaterials: application to nanosilver, JOURNAL OF NANOPARTICLE RESEARCH, Vol: 16, ISSN: 1388-0764
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- Citations: 21
Baer DR, Munusamy P, Smith JN, et al., 2014, Time dependent transformations of ceria and silver nanoparticles during synthesis, storage, and in biological media, 248th National Meeting of the American-Chemical-Society (ACS), Publisher: AMER CHEMICAL SOC, ISSN: 0065-7727
Goode AE, Hine NDM, Chen S, et al., 2014, Electron microscopic characterization of functionalized multi-walled carbon nanotubes and their interactions with the blood brain barrier, Pages: 1744-1745, ISSN: 1431-9276
Dunlop IE, Ryan MP, Goode AE, et al., 2014, Direct synthesis of PEG-encapsulated gold nanoparticles using branched copolymer nanoreactors, RSC Advances, Vol: 4, Pages: 27702-27707
Pishbin F, Mourino V, Flor S, et al., 2014, Electrophoretic Deposition of Gentamicin-Loaded Bioactive Glass/Chitosan Composite Coatings for Orthopaedic Implants, ACS APPLIED MATERIALS & INTERFACES, Vol: 6, Pages: 8796-8806, ISSN: 1944-8244
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- Citations: 138
Chen S, Hu S, Smith EF, et al., 2014, Aqueous cationic, anionic and non-ionic multi-walled carbon nanotubes, functionalised with minimal framework damage, for biomedical application, Biomaterials, Vol: 35, Pages: 4729-4738
Sarkar S, Zhang L, Subramaniam P, et al., 2014, Variability in Bioreactivity Linked to Changes in Size and Zeta Potential of Diesel Exhaust Particles in Human Immune Cells, PLOS One, Vol: 9, ISSN: 1932-6203
Acting as fuel combustion catalysts to increase fuel economy, cerium dioxide (ceria, CeO2) nanoparticles have been used inEurope as diesel fuel additives (EnviroxTM). We attempted to examine the effects of particles emitted from a diesel engineburning either diesel (diesel exhaust particles, DEP) or diesel doped with various concentrations of CeO2 (DEP-Env) on innateimmune responses in THP-1 and primary human peripheral blood mononuclear cells (PBMC). Batches of DEP and DEP-Envwere obtained on three separate occasions using identical collection and extraction protocols with the aim of determiningthe reproducibility of particles generated at different times. However, we observed significant differences in size and surfacecharge (zeta potential) of the DEP and DEP-Env across the three batches. We also observed that exposure of THP-1 cells andPBMC to identical concentrations of DEP and DEP-Env from the three batches resulted in statistically significant differencesin bioreactivity as determined by IL-1b, TNF-a, IL-6, IFN-c, and IL-12p40 mRNA (by qRT-PCR) and protein expression (byELISPOT assays). Importantly, bioreactivity was noted in very tight ranges of DEP size (60 to 120 nm) and zeta potential (237to 241 mV). Thus, these physical properties of DEP and DEP-Env were found to be the primary determinants of thebioreactivity measured in this study. Our findings also point to the potential risk of over- or under- estimation of expectedbioreactivity effects (and by inference of public health risks) from bulk DEP use without taking into account potential batchto-batchvariations in physical (and possibly chemical) properties.
Goode AE, Hine NDM, Chen S, et al., 2014, Mapping functional groups on oxidised multi-walled carbon nanotubes at the nanometre scale, Chemical Communications, ISSN: 1364-548X
Diba M, Garcia-Gallastegui A, Taylor RNK, et al., 2014, Quantitative evaluation of electrophoretic deposition kinetics of graphene oxide, CARBON, Vol: 67, Pages: 656-661, ISSN: 0008-6223
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- Citations: 54
Fajardo S, Bastidas DM, Ryan MP, et al., 2014, Low energy SIMS characterization of passive oxide films formed on a low-nickel stainless steel in alkaline media., APPLIED SURFACE SCIENCE, Vol: 288, Pages: 423-429, ISSN: 0169-4332
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- Citations: 34
Burriel M, Wilkins S, Hill JP, et al., 2014, Absence of Ni on the outer surface of Sr doped La2NiO4 single crystals, Energy and Environmental Science, Vol: 7, Pages: 311-316, ISSN: 1754-5692
A combination of surface sensitive techniques was used to determine the surface structure and chemistry of La2−xSrxNiO4+δ. These measurements unequivocally showed that Ni is not present in the outermost atomic layer, suggesting that the accepted model with the B-site cations exposed to the environment is incorrect.
Simoes TA, Goode AE, Porter AE, et al., 2014, Microstructural characterization of low and high carbon CoCrMo alloy nanoparticles produced by mechanical milling, Conference of the Electron-Microscopy-and-Analysis-Group (EMAG), Publisher: IOP PUBLISHING LTD, ISSN: 1742-6588
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- Citations: 6
Goode AE, Hine NDM, Chen S, et al., 2014, Mapping functional groups on oxidised multiwalled carbon nanotubes at the nanometre scale, CHEMICAL COMMUNICATIONS, Vol: 50, Pages: 6744-6747, ISSN: 1359-7345
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- Citations: 12
Chen S, Theodorou IG, Goode AE, et al., 2013, High-Resolution Analytical Electron Microscopy Reveals Cell Culture Media-Induced Changes to the Chemistry of Silver Nanowires, ENVIRONMENTAL SCIENCE & TECHNOLOGY, Vol: 47, Pages: 13813-13821, ISSN: 0013-936X
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- Citations: 27
Woolley RJ, Ryan MP, Skinner SJ, 2013, <i>In Situ</i> Measurements on Solid Oxide Fuel Cell Cathodes - Simultaneous X-Ray Absorption and AC Impedance Spectroscopy on Symmetrical Cells, FUEL CELLS, Vol: 13, Pages: 1080-1087, ISSN: 1615-6846
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- Citations: 14
Zhang J, Nazarenko Y, Zhang L, et al., 2013, Impacts of a Nanosized Ceria Additive on Diesel Engine Emissions of Particulate and Gaseous Pollutants, ENVIRONMENTAL SCIENCE & TECHNOLOGY, Vol: 47, Pages: 13077-13085, ISSN: 0013-936X
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- Citations: 60
Leo BF, Chen S, Kyo Y, et al., 2013, The Stability of Silver Nanoparticles in a Model of Pulmonary Surfactant., Environ Sci Technol, Vol: 47, Pages: 11232-11240
The growing use of silver nanoparticles (AgNPs) in consumer products has raised concerns about their potential impact on the environment and human health. Whether AgNPs dissolve and release Ag+ ions, or coarsen to form large aggregates, is critical in determining their potential toxicity. In this work, the stability of AgNPs in dipalmitoylphosphatidylcholine (DPPC), the major component of pulmonary surfactant, was investigated as a function of pH. Spherical, citrate-capped AgNPs with average diameters of 14 ± 1.6 nm (n=200) were prepared by a chemical bath reduction. The kinetics of Ag+ ion release was strongly pH-dependent. After 14 days of incubation in sodium perchlorate (NaClO4) or perchloric acid (HClO4) solutions, the total fraction of AgNPs dissolved varied from ~10 % at pH 3, to ~2 % at pH 5, with negligible dissolution at pH 7. A decrease in pH from 7 to 3 also promoted particle aggregation and coarsening. DPPC (100 mg.L-1) delayed the release of Ag+ ions, but did not significantly alter the total amount of Ag+ released after two weeks. In addition, DPPC improved the dispersion of the AgNPs and inhibited aggregation and coarsening. TEM images revealed that the AgNPs were coated with a DPPC layer serving as a semi-permeable layer. Hence, lung lining fluid, particularly DPPC, can modify the aggregation state and kinetics of Ag+ ion release of inhaled AgNPs in the lung. These observations have important implications for predicting the potential reactivity of AgNPs in the lung and the environment.
Pishbin F, Mourino V, Gilchrist JB, et al., 2013, Single-step electrochemical deposition of antimicrobial orthopaedic coatings based on a bioactive glass/chitosan/nano-silver composite system, ACTA BIOMATERIALIA, Vol: 9, Pages: 7469-7479, ISSN: 1742-7061
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- Citations: 177
Hatch SM, Briscoe J, Sapelkin A, et al., 2013, Influence of anneal atmosphere on ZnO-nanorod photoluminescent and morphological properties with self-powered photodetector performance, JOURNAL OF APPLIED PHYSICS, Vol: 113, ISSN: 0021-8979
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- Citations: 50
Xie F, Pang J, Centeno A, et al., 2013, Nanoscale control of Ag nanostructures for plasmonic fluorescence enhancement of near-infrared dyes, Nano Research, Vol: 6, Pages: 495-510, ISSN: 1998-0124
Potential utilization of proteins for early detection and diagnosis of various diseases has drawn considerable interest in the development of protein-based detection techniques. Metal induced fluorescence enhancement offers the possibility of increasing the sensitivity of protein detection in clinical applications. We report the use of tunable plasmonic silver nanostructures for the fluorescence enhancement of a near-infrared (NIR) dye (Alexa Fluor 790). Extensive fluorescence enhancement of ∼2 orders of magnitude is obtained by the nanoscale control of the Ag nanostructure dimensions and interparticle distance. These Ag nanostructures also enhanced fluorescence from a dye with very high quantum yield (7.8 fold for Alexa Fluor 488, quantum efficiency (Qy) = 0.92). A combination of greatly enhanced excitation and an increased radiative decay rate, leading to an associated enhancement of the quantum efficiency leads to the large enhancement. These results show the potential of Ag nanostructures as metal induced fluorescence enhancement (MIFE) substrates for dyes in the NIR “biological window” as well as the visible region. Ag nanostructured arrays fabricated by colloidal lithography thus show great potential for NIR dye-based biosensing applications.
Downing JM, Ryan MP, McLachlan MA, 2013, Hydrothermal growth of ZnO nanorods: The role of KCl in controlling rod morphology, Thin Solid Films
The role of potassium chloride (KCl) in controlling ZnO nanorod morphology of large area thin films prepared by hydrothermal growth has been extensively investigated. The influence of KCl and growth time on the orientation, morphology and microstructure of the nanorod arrays has been studied with systematic changes in the length, width, density and termination of the nanorods observed. Such changes are attributed to stabilization of the high-energy (002) nanorod surface by the KCl. At low KCl concentrations (< 100 mM) c-axis growth i.e. perpendicular to the polar surface, dominates, leading to nanorods with increased length over the control sample (0 mM KCl). At higher concentrations (> 100 mM) stabilization of the high-energy surface by KCl occurs and planar (002) facets are observed accompanied by increased lateral (100) growth, at the highest KCl concentrations near coalesced (002) terminated rods are observed. Additionally we correlate the KCl concentration with the uniformity of the nanorod arrays; a decrease in polydispersity with increased KCl concentration is observed. The vertical alignment of nanorod arrays was studied using X-ray diffraction, it was found that this parameter increases as growth time and KCl concentration are increased. We propose that the increase in vertical alignment is a result of nanorod–nanorod interactions during the early stages of growth.
Moorhouse BS, Reddyhoff T, Ward-Close M, et al., 2013, Formation of wear resistant coatings on Ti-6Al-4V by calciothermic reduction, SURFACE & COATINGS TECHNOLOGY, Vol: 221, Pages: 214-221, ISSN: 0257-8972
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- Citations: 5
Xie F, Centeno A, Zou B, et al., 2013, Tunable synthesis of ordered Zinc Oxide nanoflower-like arrays, JOURNAL OF COLLOID AND INTERFACE SCIENCE, Vol: 395, Pages: 85-90, ISSN: 0021-9797
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- Citations: 20
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