16 results on '"Deganello, Davide"'
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2. Glassy carbon manufacture using rapid photonic curing
- Author
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de Boode, Brent, Phillips, Chris, Lau, Yin Cheung, Adomkevicius, Arturas, McGettrick, James, and Deganello, Davide
- Published
- 2022
- Full Text
- View/download PDF
3. Rheology of cellulose nanofibrils and silver nanowires for the development of screen-printed antibacterial surfaces
- Author
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Spieser, Hugo, Jardin, Alexandre, Deganello, Davide, Gethin, David, Bras, Julien, and Denneulin, Aurore
- Published
- 2021
- Full Text
- View/download PDF
4. Efficient calculation of fluid-induced wall shear stress within tissue engineering scaffolds by an empirical model
- Author
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Ahmed, Husham, primary, Bedding-Tyrrell, Matthew, additional, Deganello, Davide, additional, Xia, Zhidao, additional, Xiong, Yi, additional, and Zhao, Feihu, additional
- Published
- 2023
- Full Text
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5. Study of ink release from Gravure cells using neural networks and CFD simulations
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Deganello, Davide
- Subjects
769 - Abstract
In rotogravure printing, engraved cells collect ink from a bath and then release it onto the substrate forming a series of printed dots that comprise the printed image. The purpose of this work was to explore the ink release in the rotogravure process to improve its predictability and scientific understanding. Two complimentary approaches have been investigated, an empirical approach embodied into Artificial Neural Network models and a numerical physical approach based on Computational Fluid Dynamics modelling. The Artificial Neural Network approach was based on a statistical correlation of experimental data on cell geometry with optical properties of the resulting print. The developed A.N.N. models were able to accurately predict the effect of cell geometry on ink release, outperforming traditional modelling techniques such as polynomial regression fitting techniques. The models were found to be practical and suitable to integration into manufacturing environments. The A.N.N. modelling highlighted the need for improved cell geometry data; to facilitate this, new software was developed for the automatic and accurate geometric characterisation of the engraved cells from interferometric profiles. A Computational Fluid Dynamic model of the ink release was successfully developed; the process was described as the evacuation of a Newtonian liquid from an axisymmetric cavity, showing the progressive splitting of the ink and retention of ink in the cell. This model is the first that takes into consideration the dynamic contact angle in the analysis of ink release from a cavity. The reliability of the numerical method and of its dynamic contact angle model was verified by comparing specifically designed models with experimental and literature data. The developed evacuation model shows the importance of the evacuation speed on the dynamics of the process and the critical importance of dynamic contact angle.
- Published
- 2007
6. Scalable Synthesis of Pre‐Intercalated Manganese(III/IV) Oxide Nanostructures for Supercapacitor Electrodes: Electrochemical Comparison of Birnessite and Cryptomelane Products.
- Author
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Jones, Daniel R., Hussein, Haytham E. M., Worsley, Eleri A., Kiani, Sajad, Kamlungsua, Kittiwat, Fone, Thomas M., Phillips, Christopher O., and Deganello, Davide
- Subjects
ELECTROCHEMICAL electrodes ,MANGANESE ,OXIDES ,ELECTRIC capacity ,SUPERCAPACITOR electrodes ,NANOSTRUCTURES - Abstract
Manganese(III/IV) oxide is a promising pseudocapacitive material for supercapacitor electrodes due to favorable attributes such as its chemical resilience, high earth abundance and low specific cost. Herein, the morphological, compositional and electrochemical characteristics of co‐precipitated manganese(III/IV) oxide products, each described by the general formula NaxKyMnOz, are investigated to establish how these properties are influenced by synthesis conditions. NaxKyMnOz growths in low‐temperature (<100 °C) basic and acidic environments are shown to promote the formation of turbostratic birnessite and cryptomelane phases, respectively, with the latter polymorph containing a relatively low concentration of interstitial Na+ and K+ cations. It is demonstrated that K+ pre‐insertion during synthesis yields lower initial charge‐transfer resistances than equivalent Na+ intercalation, and that this parameter correlates strongly with storage performance. Accordingly, Na‐mediated storage initially delivers inferior specific capacitances and Coulombic efficiencies than K‐based mechanisms, but K+ intercalation/deintercalation causes faster capacitance decay during prolonged galvanostatic cycling. Furthermore, whilst crystallographic phase is shown to have a weaker effect on NaxKyMnOz storage properties than the choice of intercalating guest cations, cryptomelane electrodes are more susceptible to cycling‐induced capacitance and efficiency losses than their birnessite counterparts. In combination, these insights provide an instructive foundation for the optimization of NaxKyMnOz in high‐power storage applications. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
7. Direct patterning of gold nanoparticles using flexographic printing for biosensing applications
- Author
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Benson, Jamie, Fung, Chung Man, Lloyd, Jonathan Stephen, Deganello, Davide, Smith, Nathan Andrew, and Teng, Kar Seng
- Published
- 2015
- Full Text
- View/download PDF
8. The effect of graphite and carbon black ratios on conductive ink performance
- Author
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Phillips, Chris, Al-Ahmadi, Awadh, Potts, Sarah-Jane, Claypole, Tim, and Deganello, Davide
- Subjects
Materials science ,Mechanical Engineering ,chemistry.chemical_element ,02 engineering and technology ,Carbon black ,Conductivity ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,7. Clean energy ,0104 chemical sciences ,chemistry ,Mechanics of Materials ,Screen printing ,Conductive ink ,Surface roughness ,General Materials Science ,Graphite ,Composite material ,0210 nano-technology ,Electrical conductor ,Carbon ,Composites - Abstract
Conductive inks based on graphite and carbon black are used in a host of applications including energy storage, energy harvesting, electrochemical sensors and printed heaters. This requires accurate control of electrical properties tailored to the application; ink formulation is a fundamental element of this. Data on how formulation relates to properties have tended to apply to only single types of conductor at any time, with data on mixed types of carbon only empirical thus far. Therefore, screen printable carbon inks with differing graphite, carbon black and vinyl polymer content were formulated and printed to establish the effect on rheology, deposition and conductivity. The study found that at a higher total carbon loading ink of 29.4% by mass, optimal conductivity (0.029 Ω cm) was achieved at a graphite to carbon black ratio of 2.6 to 1. For a lower total carbon loading (21.7 mass %), this ratio was reduced to 1.8 to 1. Formulation affected viscosity and hence ink transfer and also surface roughness due to retention of features from the screen printing mesh and the inherent roughness of the carbon components, as well as the ability of features to be reproduced consistently.
- Published
- 2017
9. Spray-Coating Thin Films on Three-Dimensional Surfaces for a Semitransparent Capacitive-Touch Device
- Author
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Carey, Tian, Jones, Chris, Le Moal, Fred, Deganello, Davide, Torrisi, Felice, Torrisi, Felice [0000-0002-6144-2916], and Apollo - University of Cambridge Repository
- Subjects
0306 Physical Chemistry (incl. Structural) ,capacitive touch sensor ,Technology ,Science & Technology ,PERCOLATION ,carbon nanotubes ,transparent conducting film ,3D surfaces ,Materials Science ,graphene ,0904 Chemical Engineering ,Materials Science, Multidisciplinary ,SENSOR ,0303 Macromolecular and Materials Chemistry ,HIGHLY TRANSPARENT ,LIQUID-PHASE EXFOLIATION ,RAMAN-SPECTROSCOPY ,Science & Technology - Other Topics ,GRAPHENE OXIDE ,liquid phase exfoliation ,Nanoscience & Nanotechnology ,DEPOSITION ,spray coating ,Research Article - Abstract
Here, we formulate low surface tension (∼30 mN/m) and low boiling point (∼79 °C) inks of graphene, single-wall carbon nanotubes and conductive polymer poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) and demonstrate their viability for spray-coating of morphologically uniform ( Sq ≈ 48 ± 3 nm), transparent conducting films (TCFs) at room temperature (∼20 °C), which conform to three dimensional curved surfaces. Large area (∼750 cm2) hybrid PEDOT:PSS/graphene films achieved an optical transmission of 67% in the UV and 64% in the near-infrared wavelengths with a conductivity of ∼104 S/m. Finally, we demonstrate the spray-coating of TCFs as an electrode on the inside of a poly(methyl methacrylate) sphere, enabling a semitransparent (around 360°) and spherical touch sensor for interactive devices.
- Published
- 2018
- Full Text
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10. Flexographic printing of ultra-thin semiconductor polymer layers
- Author
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Mogg, Benjamin Thomas, primary, Claypole, Tim, additional, Deganello, Davide, additional, and Phillips, Chris, additional
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- 2016
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11. Short-Term Intra-Subject Variation in Exhaled Volatile Organic Compounds (VOCs) in COPD Patients and Healthy Controls and Its Effect on Disease Classification
- Author
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Phillips, Christopher, primary, Mac Parthaláin, Neil, additional, Syed, Yasir, additional, Deganello, Davide, additional, Claypole, Timothy, additional, and Lewis, Keir, additional
- Published
- 2014
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12. Advanced packaging solutions for shelf life management of fresh food
- Author
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Alaizoki, Alaa, Deganello, Davide, Phillips, Christopher, and Hardwick, Craig
- Abstract
Liquid residues and moisture within the packaging is a big challenge to fresh food packaging, particularly for liquid-exuding food, such as meat, fish and poultry. The free-moving liquid (exudate) in the bottom of plastic food trays adversely affects the safety, quality and presentation of packaged meat products. However, the current food packaging solutions to isolate meat exudate including the addition of absorbent meat pads are not efficient, restricting the recycling process of plastic packaging and increasing plastic waste that ends up in landfill and oceans. This work reports the development of innovative plastic packaging solutions capable of effectively isolating the meat exudate within the packaging itself, ensuring more sustainable and recyclable plastic food packaging. The developed solutions include three innovative technologies:Geometry modification of liquid-holding recesses integrated into plastic food tray. The raised rims of the modified recesses act as capillary geometrical valves, enhancing the liquid pinning and pressure barrier. This results in an approximately 2.8 times increase in liquid retention capacity of the recesses, compared with a design without raised rims. Surface modification of liquid-holding recesses with oxygen plasma treatment. The localised plasma treatment of recess walls implants polar oxygen groups on the wall surfaces. This induces contrast in the surface wettability between plasma treated walls and untreated outer edges of the recesses, increasing their liquid pinning and pressure barrier, thus their liquid retention capacity. The functionality induced by plasma treatment was reserved long enough (> 60 days) for increasing the liquid retention capacity of ~2.2 times in comparison with untreated recesses. Surface modification of open-cell polymeric foam with oxygen plasma treatment. The plasma treatment results in improving the surface wettability of foam porous structure due to introducing polar oxygen groups on the pore walls. The improved wettability increases the sucking capillary pressure acting on the foam pores, allowing for higher liquid uptake and absorption of open-cell foam. The plasma treatment has sufficiently long effect on wettability improvement (> 60 days) to be used for the treatment of plastic foam packaging with an increase in the liquid absorption capacity of ~8 times. This work has led to developing innovative and sustainable plastic meat packaging for effective self-isolation of meat exudate. The plastic packaging trays incorporated with recesses are fully recyclable with liquid retention capacities comparable to the conventional absorbent meat pads. Therefore, plastic food packaging with liquid isolation capability can be manufactured with no need for additional absorbent components. The plasma treatment of open-cell polymeric foam can also replace the use of chemical wetting agents for facilitating liquid absorption, protecting human health and environment.
- Published
- 2023
- Full Text
- View/download PDF
13. Novel thin film technologies for rapid manufacture of glassy carbon and its application in printed electronics and energy storage
- Author
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Boode, Brent, Deganello, Davide, and Phillips, Christopher
- Abstract
This doctoral thesis is a research study into the thin film manufacture and applications ofglassy carbon. The aim of this research was to explore photonic curing as a novel rapidmanufacturing method to produce glassy carbon thin films and to expand the applicationsof glassy carbon in energy storage and printed electronics. Photonic curing was explored as a rapid method for producing glassy carbon coatings, reducing processing time from ~20 hours for conventional thermal processing down to ~1 minute. For both photonic and conventional thermal produced coatings, Raman spectroscopy and primary peak XPS data showed sp2 bonded carbon, indicative of bulk glassy carbon. XPS analysis indicated greater sp3 content at the immediate surface (5-10 nm) for photonic cured carbon compared with thermally cured carbon, likely due to the local environment (temperature, atmosphere) around the surface during conversion. The produced coatings were resilient, highly smooth, with no evidence of surface defects. The ability to rapidly manufacture glassy carbon coatings, by way of photonic curing, expands the potential window of applications of glassy carbons for high volume applications such as coatings for energy storage, rapid manufacture of complex electrically conductive shapes, and the opportunity to use temperature sensitive substrates. Photonic cured and thermal carbonized glassy carbon thin films were explored as electrode active materials. The glassy carbon thin films from both manufacturing methods showed comparable specific capacitances to one another and to the use of porous glassy carbon as a supercapacitor active electrode material in literature. Screen printed glassy carbon structures were made to explore potential applications for glassy carbon in printed electronics and sensors. These prints yielded electrical conductivities comparable to carbon based conductive inks, potentially expanding the applications window for glassy carbon for electronics devices with high chemical resistance, low reactivity and high thermal stability. Screen printed glassy carbon temperature and salinity sensors were produced and tested, glassy carbon as a temperature sensor yielded promising results whereas glassy carbon as a salinity sensor did not have a significant response with the investigated parameters.
- Published
- 2023
- Full Text
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14. Investigation of radar signal interaction with crossflow turbine for aviation application
- Author
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Litov, Nikolay, Mehta, Amit, and Deganello, Davide
- Abstract
The increased adoption of wind energy is an important part of the push towards a net zero-emission economy. One obstacle that stands in the way of a higher rate of wind energy adoption is the interference that wind turbines cause to nearby radar installations. Wind turbines negatively affect the performance of nearby radar sites in a variety of different ways. Almost all types of radar are affected in at least one of these ways. In order to understand the degree to which an object such as a wind turbine interacts with radar, it is important to have detailed radar cross section (RCS) data for the object. In this work, a novel, low-cost, scale model radar cross section characterization system is presented with various advantages over traditional designs. This system was used to characterize the RCS of the novel Crossflow wind turbine. Additionally, work has been carried out on the characterization of metamaterial absorber coatings that can be applied to new and existing turbines for the purposes of reducing their radar cross section and the degree to which they cause radar inter-ference. The works presented can be leveraged to reduce concerns around radar interference from wind turbines, as well as to iteratively generate ge-ometries with lower radar cross sections for the aviation and infrastructure sectors, ultimately accelerating the pace of wind energy adoption and the move towards a net zero-emission economy.
- Published
- 2023
- Full Text
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15. Smart and safe packaging
- Author
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Spieser, Hugo, Gethin, David, Deganello, Davide, Bras, Julien, and Denneulin, Aurore
- Abstract
In line with the latest innovations in the packaging field, this joint project aims at implementing new and innovative micro- and nanoparticles for the development of active and intelligent packaging solutions dedicated to food and medical packaging applications. More specifically, the project combines two major developments which both falls within the scope of active and intelligent packaging. In this work, a specific focus was given to the development of an antibacterial packaging solution and to the development of smart gas sensors. The antibacterial strategy developed was based on the combination of two active materials - silver nanowires and cellulose nanofibrils - to prepare antibacterial surfaces. The formulation as an ink and the deposition processing has been deeply studied for different surface deposition processes that include coatings or screen-printing. Results showed surfaces that display strong antibacterial activity both against Gram-positive and Gram-negative bacteria, but also interesting properties for active packaging applications such as a highly retained transparency or enhanced barrier properties. Regarding the second strategy, gas sensors have been prepared using a combination of Copper benzene-1,3,5-tricarboxylate Metal Organic Framework and carbon-graphene materials, deposited on flexible screen-printed electrodes. The easy-to-produce and optimized sensors exhibit good performances toward ammonia and toward humidity sensing, proving the versatility and the great potential of such solution to be adapted for different target applications. The results of this project lead to innovative solutions that can meet the challenges raised by the packaging industry.
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- 2021
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16. Three-dimensional biofabrication of an aragonite-enriched self-hardening bone graft substitute and assessment of its osteogenicity in vitro and in vivo .
- Author
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Shi Y, He R, Deng X, Shao Z, Deganello D, Yan C, and Xia Z
- Abstract
A self-hardening three-dimensional (3D)-porous composite bone graft consisting of 65 wt% hydroxyapatite (HA) and 35 wt% aragonite was fabricated using a 3D-Bioplotter
® . New tetracalcium phosphate and dicalcium phosphate anhydrous/aragonite/gelatine paste formulae were developed to overcome the phase separation of the liquid and solid components. The mechanical properties, porosity, height and width stability of the end products were optimised through a systematic analysis of the fabrication processing parameters including printing pressure, printing speed and distance between strands. The resulting 3D-printed bone graft was confirmed to be a mixture of HA and aragonite by X-ray diffraction, Fourier transform infrared spectroscopy and energy dispersive X-ray spectroscopy. The compression strength of HA/aragonite was between 0.56 and 2.49 MPa. Cytotoxicity was assessed using the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay in vitro. The osteogenicity of HA/aragonite was evaluated in vitro by alkaline phosphatase assay using human umbilical cord matrix mesenchymal stem cells, and in vivo by juxtapositional implantation between the tibia and the anterior tibialis muscle in rats. The results showed that the scaffold was not toxic and supported osteogenic differentiation in vitro. HA/aragonite stimulated new bone formation that bridged host bone and intramuscular implants in vivo. We conclude that HA/aragonite is a biodegradable and conductive bone formation biomaterial that stimulates bone regeneration. Since this material is formed near 37°C, it will have great potential for incorporating bioactive molecules to suit personalised application; however, further study of its biodegradation and osteogenic capacity is warranted. The study was approved by the Animal Ethical Committee at Tongji Medical School, Huazhong University of Science and Technology (IACUC No. 738) on October 1, 2017.- Published
- 2020
- Full Text
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