Wai Yee Yeong

Wai Yee Yeong
Nanyang Technological University | ntu · Division of Systems and Engineering Management

PhD

About

199
Publications
145,923
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10,139
Citations
Additional affiliations
March 2013 - present
Nanyang Technological University
Position
  • Professor (Associate)

Publications

Publications (199)
Article
Continuous fiber-reinforced polymer (FRP) composites have been used for many applications to create strong yet lightweight products due to their high strength-to-weight and stiffness-to-weight ratios. Aerospace [1], automotive [2], and sport [3]industries are three of the few industries that have been using FRP composites. The increasing need for p...
Article
Three-dimensional (3D) pigmented human skin constructs have been fabricated using 3D-bioprinting approach. The 3D pigmented human skin constructs are obtained from using three different types of skin cells (keratinocytes, melanocytes and fibroblasts from three different skin donors) and they exhibit similar constitutive pigmentation (pale pigmentat...
Article
Rapid prototyping involves the fabrication of three-dimensional structures that selectively enjoin materials in an additive layer-by-layer manner. Implants should have an appropriate design with regards to its size, weight, and geometry as well as its pore connectivity, shape, and size to bring cell-prosthesis interaction. Direction fabrication pro...
Article
Full-text available
Microfluidics has found ubiquitous presence in biological applications such as tissue spheroid fabrication and pharmacology investigation. The increasing prevalence and complexity demand a highly adaptable fabrication method for the rapid and convenient production of these microfluidic systems. 3D printing, as an emerging fabrication technique, was...
Article
For centuries, cadaveric material has been the cornerstone of anatomical education. For reasons of changes in curriculum emphasis, cost, availability, expertise, and ethical concerns, several medical schools have replaced wet cadaveric specimens with plastinated prosections, plastic models, imaging, and digital models. Discussions about the qualiti...
Article
Directed energy deposition (DED) is capable in producing complex or high-value components with good mechanical properties. Despite these potential advantages, the quality and integrity of multi-material DED parts, remains a challenging issue that limits its wide applications. Material porosity in multi-material components is detrimental since it ma...
Article
Full-text available
Additive manufacturing (AM) methods have grown and evolved rapidly in recent years [...]
Article
Unlike traditional hard grippers, soft robotic grippers are commonly made of soft materials so that the soft grippers can produce motion via elastic deformations of their compliant components. The advantages of compliance allow soft grippers to effectively eliminate shocks caused by hard contact, which usually occurs when a hard robotic gripper man...
Article
Full-text available
Skin‐inspired sensors are all the rage in robotic applications. They take inspiration from the human skin's sensory abilities and use their abilities to sense things like temperature and pressure. Herein, fabrication of ultra‐low‐cost (<$1.5), ultra‐thin, wide range, and crosstalk‐free skin‐inspired tactile sensors is presented. The sensors consist...
Article
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The ability to design and fabricate lightweight structure is one of the most important aspects for building a drone system. Often, connecting wires are used on the drone system for powering and signal transmission at the expense of the drone’s weight. In this paper, we explore the design and fabrication of a safety cage for drone using design optim...
Article
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The advancement of additive manufacturing (AM) for metal matrix nanocomposites (MMNCs) is gaining enormous attention due to their potential improvement of physical and mechanical performance. When using nanostructured additives as reinforcements in 3D printed metal composites and with the aid of selective laser melting (SLM), the mechanical propert...
Article
Successful production of overhang features, with no underlying deposited layers or substrate, in a Laser Powder Bed Fusion (LPBF) process requires sacrificial structures, known as support structures. However, these structures add extra time and cost to the manufacturing process of a component. Optimisation of support structure design should reduce...
Article
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Additive manufacturing has proven to be a viable alternative to conventional manufacturing methodologies for metallic implants due to its capability to customize and fabricate novel and complex geometries. Specific to its use in dental applications, various groups have reported successful outcomes for customized root-analog dental implants in precl...
Article
The microstructures and the mechanical properties, including fatigue crack growth (FCG) and mode I fracture toughness (KIC), of in-situ alloyed Ti41Nb (wt.%) fabricated using the laser powder bed fusion (LB-PBF) were investigated. A small hatch spacing - fast scanning strategy was utilized for obtaining parts with minimum porosity and unmelted Nb p...
Article
Full-text available
Three-dimensional (3D) bioprinting systems serve as advanced manufacturing platform for the precise deposition of cells and biomaterials at pre-defined positions. Among the various bioprinting techniques, the drop-on-demand jetting approach facilitates deposition of pico/nanoliter droplets of cells and materials for study of cell-cell and cell-matr...
Article
Three-dimensional (3D) bioprinting strategies use computer-aided processes to enable automated simultaneous spatial patterning of cells and/or biomaterials. These technologies are suitable for a broad range of biomedical applications owing to their capability to produce structurally sophisticated and functionally relevant tissue constructs. Extrusi...
Article
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Polyjet, a material jetting 3D printing technique, has been widely used for the fabrication of patient-specific anatomical models owing to the toolless fabrication technique and its ability to print multiple materials in a single part. Although the fabrication of anatomical models with high dimensional accuracy has been demonstrated, 3D printed ana...
Preprint
Full-text available
Electric vehicles (EVs) are in the incipient stage today and have the capacity to lead the automobile sector in the future. Battery packs of an electric vehicle are held by a large battery housing located at the bottom of the car body. The battery pack contributes significantly to the vehicle’s overall weight. Reduction of the overall weight of the...
Article
The use of 3D printing to produce acoustic panels with good mechanical and acoustic properties was investigated in this paper. Various fiber layups of the fiberglass face sheet and core designs were fabricated and tested for their indentation resistance and acoustic absorption performance. It was found that the bidirectional face sheet layup exhibi...
Article
Full-text available
Electrochemical impedance spectroscopy (EIS), one of the techniques for electrochemical analysis, has been used for a wide range of applications especially chemical- and bio-sensing. Besides, EIS is one of the few techniques that has been proven useful for membrane fouling detection. Electrodes are some of the most essential components for analytes...
Book
3D printed electronics have captured much attention in recent years, owing to their success in allowing on-demand fabrication of highly-customisable electronics on a wide variety of substrates and conformal surfaces. This textbook helps readers understand and gain valuable insights into 3D printed electronics. It does not require readers to have an...
Article
Full-text available
3D printing, also known as additive manufacturing, is a manufacturing process in which the materials are deposited layer by layer in an additive manner. With the advancement in materials and manufacturing technology, 3D printing has found its applications in the field of electronics manufacturing. Initially, 3D printing is used for the fabrication...
Article
Diabetes is a severe chronic disease worldwide. In various types of diabetes, the pancreatic beta cells fail to secrete sufficient insulin, at some point, to regulate blood glucose levels. Therefore, the replacement of dysfunctional pancreas, islets of Langerhans, or even the insulin-secreting beta cells facilitates physiological regulation of bloo...
Article
Full-text available
The global prevalence of respiratory diseases caused by infectious pathogens has resulted in an increased demand for realistic in-vitro alveolar lung models to serve as suitable disease models. This demand has resulted in the fabrication of numerous two-dimensional (2D) and three-dimensional (3D) in-vitro alveolar lung models. The ability to fabric...
Article
While significant progress has been made in understanding laser powder bed fusion (L-PBF) as well as the fabrication of various materials using this technology, there is still limited adoption in the industry. One of the key obstacles identified is the lack of materials that can truly manufacture functional parts directly with L-PBF. This paper cov...
Article
The complete mechanical properties (tensile, compressive, and shear properties) of the additively manufactured (AM) continuous carbon fiber reinforced thermoplastic (CFRTP) fabricated using extrusion based AM technique were investigated and reported. The fracture modes of the AM CFRTP in various mechanical tests were studied and reported. Anisotrop...
Article
A parametric experimental study on the role played by the power (P), velocity (VL) and profile (top-hat or Gaussian) of the laser on the porosity, inclusion content and microstructural evolution of in-situ alloyed laser powder bed fusion (LPBF) manufactured Ti34Nb was conducted. For this, alloys were printed with three sets of processing parameters...
Article
Full-text available
Introduction: Simulation-based training has become a popular tool for chest tube training, but existing training modalities face inherent limitations. Cadaveric and animal models are limited by access and cost, while commercial models are often too costly for widespread use. Hence, medical educators seek a new modality for simulation-based instruct...
Article
Full-text available
Additive manufacturing (AM) or 3D printing is growing rapidly in the manufacturing industry and has gained a lot of attention from various fields owing to its ability to fabricate parts with complex features. The reliability of the 3D printed parts has been the focus of the researchers to realize AM as an end-part production tool. Machine learning...
Article
Collagen is the most abundant extracellular matrix protein that is widely used in tissue engineering (TE). There is little research done on printing pure collagen. To understand the bottlenecks in printing pure collagen, it is imperative to understand collagen from a bottom‐up approach. Here it is aimed to provide a comprehensive overview of collag...
Article
Full-text available
The process-structure-property (PSP) relationship of continuous carbon fiber reinforced thermoplastics (CFRTP) manufactured through FFF was investigated for the first time, specifically on ILFT. A standard double cantilever beam test is used to evaluate the mode I ILFT. The PSP relationship is established using micro-computed tomography scan and la...
Article
Full-text available
Osteoarthritis of the knee with meniscal pathologies is a severe meniscal pathology suffered by the aging population worldwide. However, conventional meniscal substitutes are not 3D-printable and lack the customizability of 3D printed implants and are not mechanically robust enough for human implantation. Similarly, 3D printed hydrogel scaffolds su...
Article
While significant progress has been made in laser powder bed fusion (L-PBF) for metal additive manufacturing (AM), there is still limited large scale adoption of this advanced manufacturing technique by the industry. This paper covers the recent developments in L-PBF with discussions from the materials and process perspectives. High entropy alloys...
Article
Aligned cells provide direction-dependent mechanical properties that influence biological and mechanical function in native tissues. Alignment techniques such as casting and uniaxial stretching cannot fully replicate the complex fibre orientation of native tissue such as the heart. In this study, bioprinting is used to direct the orientation of cel...
Article
Purpose Soft robotics is currently a rapidly growing new field of robotics whereby the robots are fundamentally soft and elastically deformable. Fabrication of soft robots is currently challenging and highly time- and labor-intensive. Recent advancements in three-dimensional (3D) printing of soft materials and multi-materials have become the key to...
Article
Fabricating composite parts with high fiber loading and design flexibility has always been a challenge. In the recent issue of Matter, Shi and co-workers showed that high fiber loading can be achieved using localized in-plane thermal assisted (LITA) 3D printing. Coupled with robotic arm, it provides a promising way to fabricate lightweight and high...
Article
Full-text available
The first successful direct 3D printing, or additive manufacturing (AM), of heat-cured silicone meniscal implants, using biocompatible and bio-implantable silicone resins is reported. Silicone implants have conventionally been manufactured by indirect silicone casting and molding methods which are expensive and time-consuming. A novel custom-made h...
Article
In this study, laser powder bed fusion (L-PBF), also known as selective laser melting (SLM), was used to fabricate samples of titanium-tantalum (TiTa) alloys with 0, 10, 30 and 50 wt.% of tantalum using in-situ alloying. As-fabricated samples comprised of randomly dispersed pure Ta particles in a titanium-tantalum matrix. Porosity and unmelted Ta p...
Article
Full-text available
Learning anatomy is commonly facilitated by use of cadavers, plastic models and more recently three-dimensional printed (3DP) anatomical models as they allow students to physically touch and hold the body segments. However, most existing models are limited to surface features of the specimen, with little opportunity to manipulate the structures. Th...
Article
Full-text available
Multimaterials deposition, a distinct advantage in bioprinting, overcomes material’s limitation in hydrogel-based bioprinting. Multimaterials are deposited in a build/support configuration to improve the structural integrity of three-dimensional bioprinted construct. A combination of rapid cross-linking hydrogel has been chosen for the build/suppor...
Article
Cobalt-chromium-molybdenum (CoCrMo) alloys have excellent properties that make them widely used in dental applications. Selective laser melting (SLM) is a laser powder bed fusion (L-PBF) additive manufacturing, or 3D printing, technique that can fabricate functional parts directly using these alloys. In this work, SLM is used to fabricate CoCrMo s...
Article
The microstructure of metals depends on the additive manufacturing (AM) process and the process parameters. However, experimentation on different process parameters for different materials is costly and time-consuming. To overcome these challenges, numerical simulations provide insights that allow prediction of microstructure formed under different...
Article
The ability to combine multiple materials (MM) into a single component to expand its range of functional properties is of tremendous value to the ceaseless optimization of engineering systems. Although fusion and solid-state joining techniques have been typically used to join dissimilar metals, additive manufacturing (AM) has the potential to produ...
Chapter
The use of hydrogels enables the encapsulation and patterning of living cells within 3-D environment that closely mimic the physical, chemical, and biological aspects of the native extracellular matrix (ECM). This chapter first reviews the developments, key characteristics, and applications of some commonly used and emerging hydrogels. It then disc...
Chapter
This chapter reviews the recent progress in 3D printing of fiber-reinforced composites and nanocomposites. Emphasis has been paid to discuss the various 3D printing techniques available for composite material printing. 3D composite printing techniques are categorized based on the state of feedstock material used. 3D printing of composite materials...
Article
A novel custom-made 3D silicone printer and two-part Ecoflex silicone resins were used to 3D-print standard-shaped silicone coupon and irregular-shaped meniscus structures via a heat-cured extrusion-based method. This article is segmented into three parts: (1) study on the effect of 3D printing parameters on dimensional accuracy and mechanical prop...
Article
Over the years, the field of bioprinting has attracted attention for its highly automated fabrication system that enables the precise patterning of living cells and biomaterials at pre-defined positions for enhanced cell-matrix and cell-cell interactions. Notably, vat polymerization (VP)-based bioprinting is an emerging bioprinting technique for va...
Article
Full-text available
Alignment of carbon nanotubes (CNT) is of great importance for the fabrication of high-speed electronic devices such as a transistor as the electron mobilities can be greatly enhanced with aligned CNT architectures. Here, we report, for the first time, a methodology to obtain preferentially aligned CNT traces on flexible polyimide substrate utilizi...
Conference Paper
Aerosol jet printing is a process under the umbrella of additive manufacturing for conformably putting electronics on unconventional substrates. The project highlights potential of aerosol jet to print conformal and flexible antenna device. Polycaprolactone (PLC) polymer is chosen for its biodegradable nature. A flexible scaffold is fabricated usin...
Article
Full-text available
Over the years, the field of toxicology testing has evolved tremendously from the use of animal models to the adaptation of in vitro testing models. In this perspective article, we aim to bridge the gap between the regulatory authorities who performed the testing and approval of new chemicals and the scientists who designed and fabricated these in...
Article
Full-text available
Background: Bronchoscopy involves exploration of a three-dimensional (3D) bronchial tree environment using just two-dimensional (2D) images, visual cues and haptic feedback. Sound knowledge and understanding of tracheobronchial anatomy as well as ample training experience is mandatory for technical mastery. Although simulated modalities facilitate...
Article
Full-text available
Carbon nanotubes (CNTs) are 1-dimensional (1D) and flexible nanomaterials with high electric conductivity and a high aspect ratio. These features make CNTs highly suitable materials for the fabrication of flexible electronics. CNTs can also be made into dispersions which can be used as the feedstock material for droplet-based 3D printing technologi...
Article
Impact statement: Wound healing is an important area of research and clinical practice, and has captured the attention of tissue engineers since the nascent beginnings of the discipline. Tissue-engineered skin was the first FDA-approved product, achieved in 1996. Despite this success, and the passage of time, healing wounds, particularly chronic w...
Article
Ti-Nb based alloys have the potential to be used as structural implant materials due to their excellent bio-compatibility and ability to reduce stress shielding. The idea to additively manufacture Ti-Nb based alloys using selective laser melting (SLM) technology can further improve the resultant implant quality. However, the lack of economically so...
Article
Full-text available
Fiber reinforced sandwich structures are widely used as structural elements due to their lightweight and high load-bearing capacity. In this paper, effort is taken to fabricate fiber facesheet (0°/90° orientation) and corrugated cores (trapezoidal vertical pillared, core-1 and sinusoidal vertical pillared, core-2) of the sandwich structure using fu...
Article
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In 3D bioprinting, printing resolution represents the deposited material in the x- and y-axes, while dimensionality defines the structural resolution of printed constructs. Dimensionality in 3D bioprinting can be defined as the resolution in the z-axis. The printing resolution, together with dimensionality, contributes to the overall shape fidelity...
Article
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This article provides a database of the mechanical properties of additively manufactured polymeric materials fabricated using material extrusion (e.g., fused filament fabrication (FFF)). Mechanical properties available in the literatures are consolidated in table form for different polymeric materials for FFF. Mechanical properties such as tensile,...
Conference Paper
Full-text available
This paper presents a feasibility study of using 3D printing technique to fabricate microfluidic sensor for soft robotics. Microfluidic sensor are widely used in lab-on-chip devices for strain and pressure direction. This study explores 3D printing techniques for materials to fabricate microfluidic sensors. We report a simple approach like inkjet-p...