
Eifion H JewellSwansea University | SWAN · Department of Mechanical Engineering
Eifion H Jewell
Bachelor of Engineering (Mechanical Engineering) PhD
Head of Department, Research in printed electronics, coatings, thermochemical heat storage and PV upscaling
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73
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Introduction
Skills and Expertise
Publications
Publications (73)
This work implements computational chemistry as a screening tool to aid in the coating and resin formulation process. Conceptual Density Functional theory (DFT) reactivity descriptors like the global chemical hardness and the dual descriptor Fukui function identify the tendency of polyester-melamine coatings to undergo electrophilic and nucleophili...
Printed mesoscopic carbon perovskite solar cells (CPSCs) represent a potential frontrunner to perovskite commercialisation due to their inherent stability and easily scaled fabrication methods. Devices consist of three screen printed...
Mesoscopic carbon‐based perovskite solar cells (C‐PSCs) have the potential to be manufactured at an industrial scale by utilizing screen‐printing, a simple, affordable, and commercially mature process. As such, many recent publications have focused on enhancing performance through modifying cell architecture and perovskite chemistries. This work ex...
Using a mixture of micro-copper and nano-silver in the production of screen-printed circuits has the potential to reduce material costs and cost variability. The fundamental premise of this study involved dispersing silver nanoparticles among the larger copper microparticles at selected ratios and subsequently sintering in order to establish their...
Using a mixture of micro-copper and nano-silver in the production of screen-printed circuits has the potential to reduce material costs and cost variability. The fundamental premise of this study involved dispersing silver nanoparticles among the larger copper microparticles at selected ratios and subsequently sintering in order to establish their...
Organically coated steels are widely used in applications in which they are subjected to the natural environment and therefore require excellent corrosion resistance. Organic clearcoats are typically employed as a barrier that improves the overall corrosion resistance; however, they are typically derived from fossil fuel-based feedstock. A more sus...
Mesoscopic carbon-based perovskite solar cells (CPSCs) are often cited as a potential frontrunner to perovskite commercialization. Infiltration, the extent to which perovskite fills the mesoporous scaffold, is critical for optimum performance and stability. However, infiltration data are usually presented as qualitative photographic comparisons of...
Ceramics are considered to be candidate materials for galvanising pot bearing materials due to their excellent corrosion resistance in many molten metals. Galvanising pot roll bearings must have excellent wear resistance, and, therefore, it is important to understand the wear behaviour of prospective bearing materials. This study investigates the f...
Recent research into thermochemical storage (TCS) materials has highlighted their promising potential for seasonal building heating, through energy capture and release during dehydration and hydration cycling. A common TCS material used throughout this investigation was calcium chloride (CaCl2)-impregnated vermiculite-based salt in matrix (SIM). Th...
Copper potentially provides a cost-effective replacement for silver in printed electronic circuitry with diverse applications in healthcare, solar energy, IOT devices and automotive applications. The primary challenge facing copper is that it readily oxidizes to its non-conductive state during the sintering process. Photonic sintering offers a mean...
Thermochemical heat storage is one of the most attractive technologies to store heat from solar thermal energy or waste heat from industrial processes for its high energy density and long-term storage capability. This research presents a novel expanded graphite/alginate polymer matrix encapsulated with hydrated salts as highly efficient thermochemi...
Industrial waste heat is currently underutilized due to the techno-economic challenges, inherent variability and intermittency of this source. To overcome the existing barriers, reduce the emission of greenhouse gases and protect the global environmental conditions, energy recovery is one of the most effective strategies. In the design of heat stor...
Organically coated architectural steel provides an economic, visually attractive, innovation friendly and robust building cladding. However, its performance, usually calculated using accelerated weathering and 'artificial' outdoor weathering testing, can be compromised within specific areas of the building envelope. The exact reasons for this are n...
When manufacturing canned goods, the aim is to create a shelf-stable product that will keep for anywhere between one and five years (under ambient storage conditions). It is for this reason that steel, which offers desirable mechanical properties, is often used. However, steel is known to undergo corrosion thus impacting final product quality. It i...
Asset corrosion is a huge problem for the construction and other industries with an estimated cost of approximately GBP 300 billion in the EU in 2013 [1]. To mitigate this cost and protect metal substrates from corrosion, organic coatings are often used. In 2017 the EU produced 4 million metric tonnes of organically coated steel, a large quantity o...
Hydrophobicity on steel-based metallic surfaces provides an advantage in limiting corrosion and debris buildup on the surface, thereby, improving the substrate performance. An experimental investigation was conducted on the development of zinc stearate and silicon dioxide coatings on the surface of hot-dipped galvanised zinc-coated steel substrates...
Coating degradation is a critical issue when steel surfaces are subject to weathering. This paper presents a chipless, passive antenna tag, which can be applied onto organically coated steel. Simulations indicated that changes associated with organic coating degradation, such as the formation of defects and electrolyte uptake, produced changes in t...
Screen-printing inks containing various morphologies of carbon are used in the production of a variety of printed electronics applications. Particle morphology influences the rheology of the ink which will affect the deposition and therefore the electrical performance of a printed component. To assess the effect of both carbon morphology and concen...
Mesoscopic carbon-based perovskite solar cells (CPSCs) are frequently described as a potential frontrunner for PSC commercialization. Previous work has introduced γ-valerolactone (GVL) as a sustainable, non-toxic, green alternative to GBL for CPSC perovskite precursors. In this work, methanol (MeOH) solvent additives are applied to enhance the perf...
A review is carried out in this paper into techniques that currently exist for, of have the potential to be used for, monitoring the performance of organic coating. Specific attention is paid to the applicability of each method to pre-finished steel used in the construction industry as these are rarely monitored in situ and their expected performan...
Screen-printable carbon-based inks are available in a range of carbon morphologies and concentrations, resulting in various rheological profiles. There are challenges in obtaining a good print when high loading and elasticity functional inks are used, with a trade-off often required between functionality and printability. There is a limited underst...
Thermochemical storage provides a volumetric and cost-efficient means of collecting energy from solar/waste heat in order to utilize it for space heating in another location. Equally important to the storage density, the dynamic thermal response dictates the power available which is critical to meet the varied demands of a practical space heating a...
Changes in legislation have led to Cr (VI) being removed from manufacturing processes and this has an impact on the production of chromium coated packaging steel products. Novel substrates produced using Cr(III) in the electroplating process are being developed, but have yet to reach the mature functionality of the Cr(VI) substrates. As part of the...
Screen printing is the most widely used process in the production of printed electronics due to its ability to consistently transfer inks containing a wide range of functional materials onto a range of substrates. However, despite its extensive use, the mechanism by which the ink is transferred through the mesh and onto the substrate is not fully u...
Copper inks potentially provide a cost effective replacement to silver for printed electronic circuits. In glass based applications such as PV or smart glass, it can provide a means of conductivity enhancement or additional functionality. Three inks consisting of a mixture of nano and micro copper particles were systematically studied to examine th...
The carbon based perovskite solar cell (C-PSC)has a strong commercial potential due its low manufacturing cost and its improved stability. A C-PSC consists of three mesoporous layers sandwiched between a Fluorine-doped tin oxide (FTO)substrate as bottom electrode and carbon as top electrode. However, the low conductivity of the two electrodes repre...
Legislative pressures have led to the mature dominant chromium‐coated steel (ECCS) substrate and epoxy phenolic lacquer replacement in Europe. An investigation was carried out to examine the interaction between a steel surface engineered with a novel, developmental substrate coated using Cr (III)‐based electrolytes and the food stuff being canned....
Tinplate surface morphology and chemistry is adjusted during the manufacturing process in order to meet the demands of its subsequent product use, the commonest being visual appearance and food packaging stability. A comprehensive experimental study on an industrial tinning line varied the surface roughness and the tin coating weight with the chara...
Roll-to-roll slot-die coating with a meniscus guide is used to deposit several layers in a P-I-N perovskite solar cell stack, including the perovskite layer. The use of various length meniscus guides as part of the slot-die head allows controlled coating of these layers at a common coating speed. The length of meniscus guide used is optimised and r...
The fully printed, hole-transporter-free carbon perovskite solar cell structure incorporating a triple mesoscopic layer has emerged as a possible frontrunner for early industrialisation. It is an attractive structure because it can be fabricated by the simple sequential screen printing and sintering of titania, zirconia, and carbon. The device is f...
A novel study is undertaken on low cost thermochemical storage which utilizes temperatures which are compatible with low grade renewable energy capture. The discharge performance of thermochemical storage matrix materials is assessed using a custom developed experimental apparatus which provides a means of comparing materials under scaled reactor c...
Perovskite solar cells based on an all printable mesoporous stack, made of overlapping titania, zirconia, and carbon layers, represent a promising device architecture for both simple, low‐cost manufacture, and outstanding stability. Here a breakthrough in the upscaling of this technology is reported: Screen printed modules on A4 sized conductive gl...
Steel packaging remains an important mean by which foodstuffs and other products can be stored safely for a prolonged period of time. The industry is being challenged by the dual legislative pressures which require the elimination of Chrome (VI) from the manufacturing process and the elimination of bisphenol A as a component from the lacquer system...
The steel packaging industry faces the dual challenge imposed by legislation to eradicate the use of Chrome(VI) from substrate manufacture and the removal of Bisphenol-A (BPA) from the organic lacquer at the point of food contact. The paper reports on an experimental investigation into the quality of adhesion between the coatings and substrates as...
Transpired solar collectors (TSC) are an efficient means of building heating but due to the demand/use mismatch their capabilities are maximised when paired with a suitable storage technology. The hydration and/dehydration of inorganic salts provides an appropriate energy storage medium which is compatible with the air temperature provided by a con...
Carbon conductive pastes deposited by screen printing are used in many commercial applications including sensors, PCB, batteries, and PV, and as such represent an important value-added coating. An experimental investigation was carried out into the role of the solvent on the drying characteristics, conductivity, and process consistency in screen pr...
Printed carbon graphite materials are the primary common component in the majority of screen printed sensors. Screen printing allows a scalable manufacturing solution, accelerating the means by which novel sensing materials can make the transition from laboratory material to commercial product. A common bottleneck in any thick film printing process...
Abstract An experimental development programme has been carried out for the production of resistive heated panels to be used in raised access flooring. Screen printing was used as the means of depositing the heating element and the paper examines the means by which the process is optimised from assessment of material formulations through to a pilot...
In this study, we introduce a new method for the deposition of TiO2 compact layers which involves the deposition of a wet film of an inorganic titanium (IV) precursor followed by fast hydrolytic conversion to crystalline TiO2 under near infrared radiative (NIR) treatment. With this, we aim to provide a scalable alternative to methods conventionally...
An extremely fast annealing technique for mixed-halide perovskite solar cells is presented. Using photonic flash sintering, we have demonstrated that a spin-coated perovskite precursor may be fully annealed in as little as 1 ms. Devices annealed in 1.15ms yielded power conversion efficiencies (PCEs) of upto 11.3% compared to 15.2% for samples annea...
A comprehensive experimental investigation has been carried out into the role of film thickness variation and silver material formulation on printing capability in the screen printing process. A full factorial experiment was carried out where two formulations of silver materials were printed through a range of screens to a polyester substrate under...
The paper describes the development of a novel thick film top emission electroluminescent (EL) lamp which displays excellent performance and is fabricated without an ITO film and is encapsulated for safe use. The conductive adhesive laminate can be applied to low cost opaque substrates such as paper. The development utilises a commercial contact ad...
Purpose
– Printed flexible circuits that combined conventional silicon technology will enable the realisation of many value added products such as smart packaging for the fast moving consumer goods (FMCG) industry. This paper aims to describe an investigation into integrating silicon and printable circuits for the FMCG packaging industry and this w...
An experimental investigation has been undertaken to examine the suitability of paper as a substrate for screen printed electro luminescent lamps. Lamps were manufactured on 4 opaque substrates using a top emission architecture with PEDOT:PSS being used as the transparent conductor on the upper surface of the lamp. The performance was compared to l...
Purpose
The purpose of this paper is to carry out a comprehensive experimental investigation into the role of screen and conductive carbon material formulation on line conductivity and printing capability in the screen printing process, to provide design knowledge and further understanding of the screen printing for printed carbon.
Design/methodol...
Flexible thick film electroluminescent devices illuminating into both directions were fabricated using screen printing. The lamps are based on commercially available materials of electroluminescent phosphors and transparent conducting and dielectric inks. The bidirectional illuminating lamps compare favourably to unidirectional illuminating lamps r...
This paper reports on the development of a unique six colour separation system for the rendition of multi coloured images which has the elimination of practical printing issues at its focus. An algorithm is described which can be used for 6 colour separation of complex photographic images in order to maximise image gamut. Using a custom set of 6 co...
Through combined experimental and numerical investigation, the applicability of various constitutive models for predicting the nonlinear stress–strain behaviour of three silicone rubber compounds was explored under conditions that are relevant to the large deformations that are encountered in the pad printing process. The effectiveness of the propo...
In an earlier trial, an eight-page sample was printed on five different newsprint substrates with cold or heat set inks. A direct correlation was found between the value added based on visual assessment and both the chroma of individual colours and colour gamut of the printed product. This paper reports the results of the follow on study undertaken...
Flexography is being considered for the volume reel to reel printing of flexible electronics and sensors. It is critical that the process accurately and consistently reproduces small features, particularly gaps and lines. Two plates were made using conventional and digital plate making technology. These were geometrically characterised and compared...
This paper details the development of appropriate techniques for quantifying and comparing the optical properties of transparent polymer films used in in-mould decoration (IMD) and the effects of heat and strain on these properties. Currently there are no approved methods for optical characterization of transparent films, with most techniques being...
Screen printing with high build UV inks is prone to excess ink transfer (stacking) or insufficient ink transfer (skipping) in the second, third and fourth colours due to the rough surface provided by the first ink layer. An experimental investigation into the effect of squeegee material and squeegee pressure on the second colour ink transfer was un...
Colour management via ICC colour profiling potentially offers an opportunity for improved colour rendition for 4 colour screen printing. This is of particular importance as physical interactions between successive UV halftone dots results in considerable changes in the printed colour. With UV inks the transfer of the second, third and fourth colour...
Rotogravure is commonly used printing process in flexible packaging and is well suited for the microelectronic production method due to its speed and recilience of the image carrier. This study examines the reproduction of the most basic electronic component, namely a line, in terms of its printed width and gap which can be obtained between the lin...
Good maintenance practice is one of the keys to achieving increase machine utilisation and hence better productivity. While well established in the engineering manufacturing industry, it adoption in the printing industry has yet to be fully measured. A study was undertaken to establish the current position of maintenance in the UK printing industry...
Screen printing is frequently used in the manufacture of electronics and sensors as it can be used to print virtually any ink onto any substrate and produce a wide range of ink film thickness. It provides significant advantages over conventional etching techniques in that it is additive, has less process stages, it can be used on polymeric substrat...
The squeegee in screen printing forces ink into the screen and the screen into contact with the substrate. The squeegee, which is manufactured from polyurethane, has a major influence on screen printing quality. This paper summarises an experimental programme into the durability of squeegees when exposed to inks and solvents. The softer the squeege...
The squeegee in screen printing forces ink into the screen and the screen into contact with the substrate. The squeegee, which is manufactured from polyurethane, has a major influence on screen printing quality. This paper summarises an experimental programme into the durability of squeegees when exposed to inks and solvents. The softer the squeege...
Paper has many attractions as a substrate for the manufacture of flexible electronics, particularly the comparative ease of recycling and recovering the constituents of the inks. However, it is not as smooth as the polymer substrates and also does not normally have sufficient barrier properties for sensitive reactive inks. By careful attention to t...
Paper has many attractions as a substrate for the manufacture of flexible electronics, particularly the comparative ease of recycling and recovering the constituents of the inks. However, it is not as smooth as the polymer substrates and also does not normally have sufficient barrier properties for sensitive reactive inks. By careful attention to t...
This paper describes an experimental investigation into process parameter effects and viscosity variation on colour control in the printing of ceramic transfers. This has been achieved through the completion of controlled experiments and monitoring of a commercial production run. The findings indicate that process parameter adjustments have only a...
Summaries This paper describes an experimental investigation into process parameter effects and viscosity variation on colour control
in the printing of ceramic transfers. This has been achieved through the completion of controlled experiments and monitoring
of a commercial production run. The findings indicate that process parameter adjustments ha...
This paper presents the results from a comprehensive exploration of printing sequence based on dot gain, colour gamut and grey balance characteristics for screen printing. The tests involved designing a test image and this included the successful incorporation of a novel feature to explore grey balance. This allowed the three process colours, cyan,...