Dermot Brabazon

Dermot Brabazon
Dublin City University | DCU · School of Mechanical and Manufacturing Engineering

PhD

About

391
Publications
109,590
Reads
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5,540
Citations
Introduction
Prof Brabazon, Mechanical Engineering degree and Materials Science PhD from University College Dublin; Research Fellow at Materials Ireland, 1995-2000; Lecturer in School of Mechanical and Manufacturing Engineering at Dublin City University (DCU), 2000; Senior Lecturer and Deputy Head of School, 2007; Associate Dean for Research, 2009-2012; Professor, 2014; Director Advanced Processing Technology Research Centre, DCU. Research focus on Near Net Shaping, Laser Processing & Separation Science.
Additional affiliations
January 2000 - present
Dublin City University
Position
  • Director of Advanced Processing Research Centre

Publications

Publications (391)
Article
Full-text available
Lactic acid bacteria (LAB) are capable of synthesising metabolites known as exopolysaccharides (EPS) during fermentation. Traditionally, EPS plays an important role in fermented dairy products through their gelling and thickening properties, but they can also be beneficial to human health. This bioactivity has gained attention in applications for f...
Article
The recrystallization and grain growth behaviour of IN718 alloy additively manufactured by laser powder bed fusion (L-PBF) is presented herein. The effects of three different temperatures (1050, 1150 and 1250 °C) and holding times (15, 45 and 90 min) were investigated. The texture evolution of the samples was recorded via electron backscatter diffr...
Article
Mg nanoparticles (NPs) in a range of sizes (20-213 nm) were fabricated via LASIS from powders within two different liquid mediums, namely DI water and isopropyl alcohol for the first time. The effect of laser pulse width (0.60, 0.92 and 1.24 ns) and liquid medium on the UV-Visible and Fourier-transform infrared spectra, zeta potentials, concentrati...
Article
This study evaluates the phase and microstructural evolution of additively manufactured (AM) Nickel Titanium (NiTi) alloy, across the interface with 316L stainless steel build plate, in order to understand the processing parameter (input power, layer thickness and scan speed), composition, and microstructure interrelationships necessary to achieve...
Article
Additive free conductive ink formulation via green techniques and its direct printing is critical for many applications including smart electronics, solar cells, healthcare and electrochemical energy storage. The available printable ink generations are far away from ideal. This study reports the development of additive free silver (Ag) nano particl...
Article
Full-text available
Metal additive manufacturing, which uses a layer-by-layer approach to fabricate parts, has many potential advantages over conventional techniques, including the ability to produced complex geometries, fast new design part production, personalised production, have lower cost and produce less material waste. While these advantages make AM an attracti...
Article
In this work, nitinol samples were produced via Laser Powder Bed Fusion (L-PBF) in the horizontal and vertical orientations with systematic variations in laser power, scan speed and hatch spacing parameters. Increased density was positively correlated with increased laser power, scan speed and hatch spacing for the horizontally built samples but no...
Article
Functionally grading material composition in laser-powder bed fusion grants the potential for manufacturing complex components with tailored properties. The challenge in achieving this is that the current laser-powder bed fusion machine technology is designed to process only powdered feedstock materials. This study presents a multi-feedstock materi...
Article
Laser powder bed fusion (L-PBF) success in the industrial scenario strongly depends on the ability to manufacture components without defects and with high building rates, but also on the ability to effectively control the microstructure to gain the required properties in the final component. In this regard, the recently developed numerical simulati...
Article
Full-text available
This paper presents an examination of the production of copper air filters via the Hydraulic Pressing (HP) method. Processing conditions examined included powder particle type (spherical and dendritic), varying compaction pressures (635, 714, and 793 MPa) and different pore forming (polyvinyl alcohol (PVA)) concentrations (1, 2, and 3 wt.%). Follow...
Article
Full-text available
Functionalised holograms are important for applications utilising smart diffractive optical elements for light redirection, shaping and in the development of sensors/indicators. This paper reports on holographic recording in novel magnetic nanocomposites and the observed temperature change in dry layers and liquid samples exposed to alternating mag...
Article
Laser-powder bed fusion was identified as a promising technique for manufacturing metal matrix composites. However, over a decade later, little progress has been made in addressing the persisting issues hindering the wider exploitation and industrial usage of metal matrix composites. Therefore, the present study proposes the implementation of a fea...
Article
Full-text available
In this study, the effect of as-built and heat-treated additively manufactured 316L stainless steel at different temperatures was examined on the electrochemical corrosion performance. The corrosion was investigated by Tafel polarization and electrochemical impedance spectroscopy methods in a 3.5% NaCl solution. For this purpose, the as-built and h...
Article
Full-text available
Over 80% of wastewater worldwide is released into the environment without proper treatment. Whilst environmental pollution continues to intensify due to the increase in the number of polluting industries, conventional techniques employed to clean the environment are poorly effective and are expensive. MXenes are a new class of 2D materials that hav...
Article
Full-text available
Powder Bed Fusion (PBF) has emerged as an important process in the additive manufacture of metals. However, PBF is sensitive to process parameters and careful management is required to ensure the high quality of parts produced. In PBF, a laser or electron beam is used to fuse powder to the part. It is recognised that the temperature of the melt poo...
Article
Achieving good surface profile and low levels of porosity are prime challenges in the Laser-Powder Bed Fusion (L-PBF) additive manufacturing technique. In order to optimise these properties, post-processing is often required. However, the compression of powder spread on the build plate and re-melting of each build layer during the L-PBF process cou...
Article
Poor surface quality of Additively Manufactured (AM) components, can greatly increase the overall cost and lead time of high-performance components. Examples are medical devices where surfaces may contact the patient's skin and hence need to be smooth and aerospace components with high fatigue strength requirements where surface roughness could red...
Article
Conductive inks allow for low cost and scalable deposition of conductive tracks and patterns for printed electronics. Metal nanoparticle colloids are a novel form for producing conductive inks. Laser Ablation Synthesis in Solution (LASiS) is a “green” method for the production of metal nanoparticle colloids without the need for environmentally haza...
Article
Despite the accelerated growth of laser-powder bed fusion in recent years, there are still major obstacles to be overcome before the technology enjoys truly widespread adoption. These include inconsistent part quality and repeatability issues linked to variability in the properties of printed parts. Commonly, the print location across the build pla...
Article
Full-text available
The present study reports the glass-forming ability, density change on crystallization and corrosion behavior of newly developed rare-earth free Cu-based metallic glasses (CBMGs). The critical casting thickness of these new CBMGs increased from 15 mm at 8 at.% Hf to 22 mm at 12 at.% Hf, reaching a maximum value of 28.5 mm at 13.5 at.% Hf. It droppe...
Article
Paper-based electronics with carbon nanomaterials incorporated have several advantages including recyclability, biodegradability, non-toxicity, low cost and ease of fabrication and disposal. Herein, carbon nanoparticles (CNPs) were fabricated by Pulsed Laser Ablation in Liquid (PLAL) using three different liquid mediums, i.e. deionised (DI) water,...
Article
Full-text available
Magnesium nanoparticles of various mean diameters (53–239 nm) were synthesised in this study via pulsed laser ablation in liquid (PLAL) from millimetre sized magnesium powders within isopropyl alcohol. It was observed via a 3 × 3 full factorial design of experiments that the processing parameters can control the nanoparticle distribution to produce...
Article
In this paper, numerical and experimental investigations of thermal performance enhancement of horizontal longitudinal shell and tube latent heat thermal energy storage unit (LHTESU) via eccentricity (e), fin design optimization, and nanoparticles in the phase change material (PCM) of stearic acid are presented. An enthalpy-porosity-based two-dimen...
Preprint
Full-text available
Magnesium nanoparticles of various mean diameters (53 – 239 nm) were synthesized herein via Pulsed Laser Ablation in Liquid (PLAL) from millimeter sized magnesium powders within iso-propyl alcohol. It was observed via a 3x3 full factorial DOE that the processing parameters can control the nanoparticle distribution to produce three size-distribution...
Article
Full-text available
Powder recycling and reducing the waste metallic powder is EU’s key provision in waste framework directive (2008/98/EC). The aim of this investigation is to analyse the correlation between the surface and morphology properties of (virgin and recycled) powders and the microstructure and mechanical properties of the 3D printed parts (made of three po...
Article
Full-text available
The use of flexible sensors has tripled over the last decade due to the increased demand in various fields including health monitoring, food packaging, electronic skins and soft robotics. Flexible sensors have the ability to be bent and stretched during use and can still maintain their electrical and mechanical properties. This gives them an advant...
Article
This study is focused on the 3D printing of NiTi shape memory alloy (SMA) in cuboidal shaped samples via the Laser Powder Bed Fusion (L-PBF) process using a dissimilar material build plate of 316L stainless steel. Four processing parameters were investigated at three levels for the optimization of the process. Those parameters were the laser beam p...
Article
Full-text available
The development of environmentally friendly materials has been the focus of many research groups in recent years due to increased harmful effects of plastics on the environment. Bio-based materials are considered a key solution from a sustainable manufacturing perspective. The nano-coating of biopolymer blends with silver nanoparticles is the subje...
Preprint
Full-text available
The use of flexible sensors has tripled over the last decade due to the increased demand in various fields including health monitoring, food packaging, electronic skins and soft robotics. Flexible sensors have the ability to be bent and stretched during use and can still maintain their electrical and mechanical properties. This gives them an advant...
Chapter
Full-text available
In chapter 8, pulsed laser ablation in a liquid process is presented. In this process a laser is fired at the interface between a solid and liquid, and a plasma is created from the solid, which in turn condenses back into nanoparticles retained within the liquid. This process can be used within a static liquid or a dynamic flow regime. In the stati...
Article
Full-text available
In this study, the printing capability of two different additive manufacturing (3D printing) techniques, namely PolyJet and micro-stereolithography (µSLA), are investigated regarding the fabrication of bone scaffolds. The 3D-printed scaffold structures are used as supports in replacing and repairing fractured bone tissue. Printed bone scaffolds wit...
Book
Full-text available
This book presents a collection of chapters written by experienced researchers in the fields of laser micro- and nano-scale processing for both surface and bulk processing covering surface modification processes, laser material interaction regimes, laser system construction for micro- and nanomachining applications, and the thermal mathematical mod...
Chapter
Full-text available
The first chapter describes the themes and topics of the book and introduces the contents of the chapters.
Preprint
Full-text available
Bayesian optimization (BO) is an approach to globally optimizing black-box objective functions that are expensive to evaluate. BO-powered experimental design has found wide application in materials science, chemistry, experimental physics, drug development, etc. This work aims to bring attention to the benefits of applying BO in designing experimen...
Article
Full-text available
A novel high-density yeast propagation system has been developed, which produced yeast that performed as well as cropped yeast in commercial brewery trials. This process is capable of producing yeast concentrations 13 times greater than traditional yeast propagation approaches used in breweries to date. The system is based on a controlled fed-batch...
Article
Full-text available
The field of planar chromatography has seen a resurgence due to interest in novel fabrication techniques for sorbent (stationary phase) layers. These novel sorbents must have high surface areas and achieve separations over short distances. Here, we present the first attempt to fabricate a planar chromatographic platform via laser ablation. Microcha...
Article
Despite the recent progress in additive manufacturing (AM) process and technology, challenges in the repeatability and reproducibility of AM parts still hinders the adoption of this technique in many industries. This is particularly difficult when a part is qualified on a particular part on a certain machine using optimised parameters. If a manufac...
Article
Full-text available
The use of metal matrix composites (MMCs) in a variety of products is significantly increasing with time due to the fact that their properties can be tailored and designed to suit specific applications. However, the future usage of MMC products is very much dependent on their beneficial aspects and hence it is critical to ensure in a robust repeata...
Article
Full-text available
Nanotechnology is a significant research tool for biological and medical research with major advancements achieved from nanoparticle (Np) applications in biosensing and biotherapeutics. For laser ablation synthesis in solution (LASiS) to be chosen by researchers for Np colloid production, the process must effectively compete with chemical synthesis...
Article
Poor surface quality represents an important issue that needs improvement for metal Additively Manufactured parts. Both short or long wavelength lasers have been applied for surface polishing in order to improve the surface finish. In this work, the possible use of a CO2 laser for the surface polishing of AlSi10Mg parts made by Laser-based Powder B...
Article
Full-text available
Process monitoring and sensing is widely used across many industries for quality assurance, and for increasing machine uptime and reliability. Though still in the emergent stages, process monitoring is beginning to see strong adoption in the additive manufacturing community through the use of process sensors recording a wide range of optical, acous...
Article
Full-text available
In recent years, recycling the powder leftover within the additive manufacturing process has been attractive for both research, development and industry production. Powder recycling can significantly enhance the sustainability of the manufacturing process, reduce the cost and avoid producing metallic waste as a potential environmental hazard. The f...
Article
Full-text available
Metal nanoparticles have unique chemical, physical, electrical, and optical properties that make them attractive for a wide range of applications in sensing, anti-fouling surfaces, medicine, and conductive inks. Pulsed Laser Ablation in Liquid (PLAL) is a green method of nanoparticle colloid production, capable of producing ligand-free nanoparticle...
Article
Additive manufacturing has proven to be a very beneficial production technology in the medical and healthcare industries. While existing for over four decades, recent work has seen great improvements in the quality of products; particularly in medical devices such as implants. Improved customization reduced operating time and increased cost-effecti...
Article
Full-text available
Post-processing is one of the main ways to improve mechanical and microstructural characteristics of stainless steel 316L fabricated by the laser-based powder bed fusion (LPBF) process. In this study, optimized LPBF parameters were used to manufacture SS316L bars. For the post-processing, two main heat treatment strategies have been used, quenching...
Article
In this study, in order to understand the nanostructure of FeCrNi steels in the laser powder bed fusion (LPBF) process, directional solidification was simulated using large-scale molecular dynamics simulation (LSMDS). For this purpose an atomic box with a dimension of 70×40×60(nm3) including random dispersion of Fe, Cr and Ni was created. Then, two...
Article
Full-text available
Powder spreading is a crucial step in the powder bed fusion process, which controls the quality of powder bed and consequently affects the quality of printed parts. To date, however, powder spreadability has received very little attention and substantial fundamental work is still needed, largely because of the lack of experimental studies. Therefor...
Article
Full-text available
The advent of cost effective printed smart devices has revolutionized the healthcare sector by allowing disease prediction and timely treatment through non-invasive real time and continuous health monitoring. Future advancements in printed electronic (PE) materials will continue to enhance the quality of human living. For any PE application, materi...
Chapter
The past decades have witnessed the advent of nanotechnology, which has led to significant advances in various industries. Remarkable advances have been achieved in the various sciences through improved control of nanometer scale materials’ characteristics and properties, and their exploitation in modern systems. Material scientists are continually...
Chapter
Improved global knowledge of material processing environmental issues has resulted in the development of sustainable and environment-friendly green composite materials, which are recyclable and renewable resources. Green composite materials include metallic, polymer and cement based composites. Green metal-matrix composites have achieved widespread...
Chapter
Spark plasma sintering has emerged as a high-tech, novel, and greatly profitable technique for powder materials sintering, which can be used for the production of near-net-shape bulk materials. This recently developed consolidation process operates via the simultaneous pressing and rapid heating of the material, generally in a well-defined powder f...
Chapter
Metal matrix composites (MMCs) are considered as advanced materials possessing unique physical and mechanical properties. Additive manufacturing (AM), also known as 3D-printing, is process of joining materials to make objects from three-dimensional model data, layer-by-layer, as opposed to subtractive manufacturing methodologies. AM provides an opp...
Chapter
Solid-state methods are frequently used to fabricate metal matrix composites, which usually lead to superior mechanical properties compared to liquid state routes. In this article, different solid-state routes including powder metallurgy, diffusion bonding, forging, accumulative roll bonding, extrusion, explosive bonding, and friction stir processi...
Chapter
The term 4D printing, first introduced in 2013, emerged from the addition of a temporal dimension to 3D printing. Unlike 3D printing, 4D printing offers structures that can be transformed in shape, properties, and/or functionality after printing. Stimuli such as light, water, electricity and heat trigger the actuation of printed structures without...
Chapter
Additive Manufacturing (AM) is a group of advanced manufacturing techniques that have significant benefits for sustainability. AM can reduce material waste, storage, and obsolescence, and enable lighter parts which improve fuel efficiencies. Composite materials can also benefit sustainability by making use of recycled materials, enabling lighter or...
Chapter
This section of the Encyclopedia presents an overview of the materials, processing methods and characteristics of Polymer Matrix Composite Materials. This article summaries the main areas within this section. A wide range of polymer matrix materials are examined herein including for example acrylonitrile-butadiene-styrene and poly-methyl methacryla...
Chapter
This section of the Encyclopedia presents an overview of the materials, processing methods and physical characteristics of metal, polymer and ceramic composite materials. This article summaries the main areas within this section. A wide range of metal, polymer and ceramic matrix composite materials are examined herein including aluminum, ABS, and a...
Chapter
Laser Powder Bed Fusion (L-PBF) is a technique in which a layer of metal powder is deposited, melted, and solidified using a laser to create a solid layer of metal, with consecutive 2D layers being joined to preceding layers to build up fully solid 3D components. This technique has been the focus of considerable interest from research groups and in...
Chapter
Over the past decade or so, porous carbon materials have attracted significant attention, and have been shown a significant potential for many cutting edge applications, including catalysis supports, supercapacitors, gas storage, and sorbents for separation/remediation processes. These diverse applications stem from high specific surface areas and...
Article
In this work, nitinol samples were produced via Laser Powder Bed Fusion (L-PBF) in the horizontal and vertical orientations with systematic variations in laser power, scan speed and hatch spacing parameters. Increased density was positively correlated with increased laser power, scan speed and hatch spacing for the horizontally built samples but no...
Chapter
Polymers are one of the most commonly used material categories utilized in fabricating various components in order to use in different applications. Many conventional methods have been applied for manufacturing the polymer-based structures, but additive manufacturing (AM) as a new method brought several key advantages like cost-effectiveness and th...
Article
Full-text available
Laser-Powder Bed Fusion (L-PBF) of metallic parts is a highly multivariate process. An understanding of powder feedstock properties is critical to ensure part quality. In this paper, a detailed examination of two commercial stainless steel 316L powders produced using the gas atomization process is presented. In particular, the effects of the powder...
Article
Full-text available
The growing importance of nanomaterials toward the detection of neuro-transmitter molecules has been chronicled in this review. Neurotransmitters (NTs) are chemicals that serve as messengers in synaptic transmission and are key players in brain functions. Abnormal levels of NTs are associated with numerous psychotic and neuro-degenerative diseases....