Browsing by Author "Prime, Dominic"
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Item Metadata only Analysis of powder caking in multicomponent powders using atomic force microscopy to examine particle properties.(Wiley, 2011-01) Prime, Dominic; Leaper, Mark C.; Rielly, Christopher D.; Jones, James R.; Stapley, AndrewAtomic force microscopy has been used to study the surface properties of model spray dried powders. Phase imaging, nanoindentation and force modulation microscopy have differentiated between the different surface material properties of the particles, revealing a regular dispersion of soft, oil rich areas distributed across the particles' surface. Humidity and temperature cycling effects on the caking behavior of the particles have also been investigated, with significant morphology changes and onset of caking found to occur within relatively short periods of time.Item Metadata only Caking behaviour of spray-dried milk powders - using scanning probe microscopy to study nanoscale surface properties(DECHEMA, 2010-10) Prime, Dominic; Leaper, Mark C.; Jones, James R.; Richardson, David J.; Rielly, Christopher D.; Stapley, Andrew G. F.Item Metadata only Caking behaviour of spray-dried milk powders - using scanning probe microscopy to study nanoscale surface properties(Wiley, 2011-01) Prime, Dominic; Leaper, Mark C.; Jones, James R.; Richardson, David J.; Rielly, Christopher D.; Stapley, Andrew G. F.Atomic force microscopy has been used to study the surface properties of model spray dried powders. Phase imaging, nanoindentation and force modulation microscopy have differentiated between the different surface material properties of the particles, revealing a regular dispersion of soft, oil rich areas distributed across the particles’ surface. Humidity and temperature cycling effects on the caking behavior of the particles have also been investigated, with significant morphology changes and onset of caking found to occur within relatively short periods of time.Item Metadata only Effect of processing variables and bulk composition on the surface composition of spray dried powders of a model food system(Elsevier, 2013) Jones, Jim R.; Prime, Dominic; Leaper, Mark C.; Richardson, David J.; Rielly, Christopher D.; Stapley, A. G. F.Item Metadata only Effect of processing variables and bulk composition on the surface composition of spray dried powders of a model food system(DECHEMA, 2010-10) Jones, James R.; Prime, Dominic; Leaper, Mark C.; Richardson, David J.; Rielly, Christopher D.; Stapley, Andrew G. F.Item Metadata only Electrical and morphological properties of polystyrene thin films for organic electronic applications.(Elsevier, 2009-10-28) Prime, Dominic; Paul, ShashiThis study investigates the electrical and morphological properties of polystyrene layers in the nanometre thickness range for organic and polymer based electronic applications. The paper aims to providing conduction data and information on trapped charges present in the polystyrene layer, as well as investigating how polystyrene properties change under differing annealing conditions. The maximum dielectric strength was found to be 4.0 MV cm−1, while fixed trapped charge and mobile trapped charge average densities were calculated to be 9.9 × 10^11 cm−2 and 2.6 × 10^12 cm−2 respectively. Optimum electrical characteristics were obtained at an anneal temperature of 90 °C, which is just below the glass transition temperature for polystyrene.Item Metadata only Electrical properties of nanometre thin film polystyrene for organic electronic applications.(Institute of Electrical and Electronic Engineers, 2008-08-08) Prime, Dominic; Josephs-Franks, P. W.; Paul, ShashiPolystyrene is a promising organic insulator for use in organic electronic devices owing to its excellent electrical and mechanical characteristics. However, much of the work that has been done in characterising polystyrene has been done on films several micrometres thick, and as such is difficult to relate to the properties that need to be considered for electronic devices, where films thicknesses are generally in the nanometre range. In this report, we focus on the electrical characteristics of nanometre thin films, both in terms of current-voltage behavior, and capacitance-voltage characteristics and how the properties of the polystyrene films are altered by differing annealing temperatures.Item Metadata only First contact-charging of gold nanoparticles by electrostatic force.(American Institute of Physics, 2010-01-29) Prime, Dominic; Paul, ShashiThe use of nanoparticle materials in the manufacture of electronic polymer memory devices is on the rise. Organic memory devices are fabricated by depositing a blend of organic polymer, small organic molecules, and nanoparticles between two metal electrodes. The primary aim is to produce devices that exhibit two distinct electrical conductance states when control voltages are applied. By retaining the states when power is removed can be viewed as the realization of nonvolatile memory. In this letter, an attempt is made to further understand the conundrums that scholars in this field are currently facing, with questions about the nanoparticle charging mechanism being investigate.Item Metadata only Gold nanoparticle based electrically rewritable polymer memory devices.(Scientific.net, 2008-09) Prime, Dominic; Paul, ShashiOrganic and polymer based electronic devices are currently the subject of a great deal of scientific investigation and development. This interest can be attributed to the low cost, easy processing steps and simple device structures of organic electronics when compared to conventional silicon and inorganic electronics. In the field of organic electronic memories, non-volatile, rewritable polymer memory devices (PMDs) have shown promise as a future technology where cost and compatibility with flexible substrates are important factors. In this paper PMDs based on active layers containing an admixture of polystyrene, gold nanoparticles and 8-hydroxyquinoline will be presented, showing the devices’ electrical characteristics and memory performance attributes, and where possible discussing possible mechanisms of operation.Item Metadata only Gold nanoparticle charge trapping and relation to organic polymer memory devices.(The Royal Society, 2009-10-28) Prime, Dominic; Josephs-Franks, P. W.; Paul, ShashiNanoparticle-based polymer memory devices (PMDs) are a promising technology that could replace conventional silicon-based electronic memory, offering fast operating speeds, simple device structures and low costs. Here we report on the current state of nanoparticle PMDs and review some of the problems that are still present in the field. We also present new data regarding the charging of gold nanoparticles in metal–insulator–semiconductor capacitors, showing that charging is possible under the application of an electric field with a trapped charge density due to the nanoparticles of 3.3x10^12 cm−2.Item Metadata only Making plastic remember: electrically rewritable polymer memory devices.(Materials Research Society, 2007-04) Prime, Dominic; Paul, ShashiOrganic based electronic memory devices are currently receiving an unprecedented amount attention as possible alternatives for conventional semiconductor memories, due to their simple device structures, ease of fabrication, compatibility with flexible substrates and low cost. Polymer memory devices (PMDs) based on active layers containing gold nanoparticles (Q-Au) with 8-hydroxyquinoline (8HQ) will be presented in this report. Memory performance attributes will also be presented, which are less reported in the literature, but still essential for the realisation of viable organic memory technologies.Item Metadata only Morphological changes in Enterococcus faecium on exposure to Citrus essential oils in vapor phase as determined by TEM, SEM and AFM(Taylor and Francis, 2012) Laird, Katie; Score, J.; Prime, Dominic; Phillips, C. A.Item Metadata only Overview of organic memory devices.(The Royal Society, 2009-10-28) Prime, Dominic; Paul, ShashiThe demand for more efficient and faster memory structures is greater today than ever before. The efficiency of memory structures is measured in terms of storage capacity and the speed of functioning. However, the production cost of such configurations is the natural constraint on how much can be achieved. Organic memory devices (OMDs) provide an ideal solution, in being inexpensive, and at the same time promising high performance. However, all OMDs reported so far suffer from multiple drawbacks that render their industrial implementation premature. This article introduces the different types of OMDs, discusses the progress in this field over the last 9 years and invokes conundrums that scholars of this field are currently faced with, such as questions about the charging mechanism and stability of devices, contradictions in the published work and some future directions.Item Metadata only Probe propels IR thermal microscopy to a new level(2011) Oxley, C. H.; Hopper, Richard; Prime, Dominic; Leaper, Mark C.; Evans, Gwynne; Levick, AndrewItem Metadata only Solid Bridge Formation Between Spray-Dried Sodium Carbonate Particles(2012) Leaper, Mark C.; Prime, Dominic; Taylor, P. M.; Leach, V.Item Metadata only The Use of Atomic Force Microscopy in Investigating Particle Caking Mechanisms(Wiley, 2013) Leaper, Mark C.; Prime, Dominic