Article
Chemistry, Analytical
Amir Reza Ameri, Armin Imanparast, Mohammad Passandideh-Fard, Seyed Ali Mousavi Shaegh
Summary: Microfluidics has been used to create a whole-thermoplastic microfluidic chip for on-chip cell culture. The chip was made of polymethyl methacrylate (PMMA) and thermoplastic polyurethane (TPU) using high precision micromilling and laser micromachining. A pneumatic solo diffuser-nozzle micropump was integrated with the chip for on-chip pumping. The chip also included an oxygenator for sufficient oxygen delivery. The proposed chip showed promising potential for various cell culture studies.
ANALYTICA CHIMICA ACTA
(2022)
Article
Engineering, Electrical & Electronic
Valeria Nico, Eric Dalton
Summary: Microfluidic technology has grown rapidly in recent years, with limitations in pumps for high-end electronics and biomedical devices. A novel magnetic shuttle pump technology and numerical model were proposed to address this issue, showing promising results in achieving required pressure and flow characteristics through simulations and experiments.
SENSORS AND ACTUATORS A-PHYSICAL
(2021)
Article
Engineering, Electrical & Electronic
Dian-Bin Hu, Li-Peng He, Zheng Zhang, Ya-Mei Liu, Li-Na Cui, Guang-Ming Cheng
Summary: This study proposes a valveless piezoelectric pump with an inner triangle structure to reduce backflow. Theoretical modeling and finite element analysis are used to analyze the efficiency and flow resistance of the pump, and experimental results show optimal performance under specific conditions.
MICROSYSTEM TECHNOLOGIES-MICRO-AND NANOSYSTEMS-INFORMATION STORAGE AND PROCESSING SYSTEMS
(2022)
Article
Materials Science, Multidisciplinary
Felix Bouchard, Marcos Soldera, Andres Fabian Lasagni
Summary: In this study, a cost-effective strategy is demonstrated for fabricating micro-structured PMMA diffusers for white light sources. Different laser-based processes are combined to fabricate periodic patterns on stainless steel surfaces and transfer them to PMMA surfaces. The relationship between surface topography and white light scattering behavior is investigated, and the hierarchical structures can significantly increase haze while maintaining high transmittance.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Sriharitha Rowthu, Srinadh Mattaparthi, Erdem Siringil, Patrik Hoffmann
Summary: Limited research data are available on fabricating sewage water-repellent surfaces. In this study, magnetic silicone composites and PDMS surfaces are successfully developed via hot embossing and replica molding methodologies. These surfaces exhibit high static contact angles, low contact angle hystereses, and low roll-off angles, demonstrating excellent sewage water repellency and superhydrophobicity.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Chemistry, Analytical
Chao Xu, Kun Wang, Peng Huang, Demeng Liu, Yimin Guan
Summary: The isolation of single cells is crucial for the advancement of single cell analysis methods. Traditional techniques have limitations in terms of complexity and throughput. A microfluidic chip has been developed using thermal bubble micropump technology, allowing for efficient single-cell isolation without the need for injection pumps or peristaltic pumps. The method has shown high capture rates for both polystyrene beads and cells, making it a promising approach for single-cell isolation.
Article
Polymer Science
Chih-Yuan Chang
Summary: A novel nonuniform heating method for hot embossing of polymers with multiscale microstructures was proposed in this study, allowing for the fabrication of high-quality polymer microstructure patterns through a single-step process. This technique has great potential for rapid and flexible fabrication of multiscale microstructure patterns on polymer substrates.
Article
Chemistry, Multidisciplinary
Jaishree, A. Bhandari, N. Khatri, Y. K. Mishra, M. S. Goyat
Summary: Over the past few decades, superhydrophobic coatings (SHCs) have attracted scientists and researchers due to their wide range of applications in various fields. Different techniques have been attempted to fabricate SHCs, but most of them have limitations. The hot embossing (HE) technique, however, shows great potential in replicating micro-nanofeatures on polymeric surfaces. This review article focuses on the recent advancements in HE-operated polymeric SHCs and their applications.
MATERIALS TODAY CHEMISTRY
(2023)
Article
Engineering, Electrical & Electronic
Mohammad Dehghan, Mohammad Tahmasebipour
Summary: This study investigated the fabrication and characterization of a novel electromagnetic micropump. It proposed a micropump consisting of a stainless-steel mass-spring structure, a polydimethylsiloxane body and membrane, a permanent NdFeB magnet, a micro-coil, and a 3D printed spacer. The effects of the frequency and duty cycle of the electrical current on the micropump flow rate and membrane deflection were investigated, and the maximum volumetric flow rate and membrane deflection were obtained.
JOURNAL OF MICROMECHANICS AND MICROENGINEERING
(2023)
Article
Materials Science, Ceramics
Kangsen Li, Guihao Lian, Daohang Yan, Zhenlong Wang, Feng Gong
Summary: Glass hot embossing is a cost-effective method for manufacturing glass microstructures, but the spatial volume of the mold cavity affects the deformation behavior and final shape of the embossed glass. By using FIB, blind micro-hole array structures with different depths were fabricated as embossing templates to investigate the impact of spatial gas on the glass deformation mechanism. The experimental results showed that the spatial volume of the mold cavity greatly influenced the gas expansion energy and deformation height of glass microstructures during hot embossing.
CERAMICS INTERNATIONAL
(2023)
Article
Engineering, Electrical & Electronic
Mostafa Sedky, Mohamed Serry
Summary: This work presents the design and characterization of a novel electromagnetically actuated 3D printed micropump that achieves a high flow rate using a synchronized active valve. The micropump utilizes two elastic membranes and magnets in two chambers for the pump and valve operations, with a modular design for easy assembly and attachment to a microfluidic chip. The proposed micropump has the highest reported flow rate at a power consumption of 0.5 W, and its unique design allows integration of powerful magnets and coils within a compact volume.
SENSORS AND ACTUATORS A-PHYSICAL
(2022)
Article
Chemistry, Physical
Youcheng Zhu, Feng Gong, Gao Yang
Summary: This study investigates the oxidation behaviors of various ceramics in high-temperature hot embossing and measures their mass changes, surface morphology, roughness, and hardness. The results show that different ceramics have different suitable embossing temperature ranges.
Article
Thermodynamics
Yun-Hao Peng, Dai-Hua Wang, Xin-Yu Li, Ying Zhang
Summary: This article proposes the principle and structure of an embedded active microchannel heat sink (EAMCHS) on a printed circuit board (PCB) for cooling chips. By integrating MCHS, diffuser/nozzle piezoelectric micropump (PMP), and piezoelectric microvalves, EAMCHS improves integration and cooling efficiency while reducing size, energy consumption, and coolant consumption. Experimental results show that EAMCHS effectively controls chip temperature and has low energy consumption, small size, and light weight.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Optics
Jiashun Liu, Jianzhi Li, Feng Gong, Gao Yang
Summary: Hot embossing is a promising technology for mass production of PMMA microstructures. This study proposes a novel hot embossing equipment and a characterization method for real-time monitoring of PMMA filling behavior and shape evolution. The effects of process parameters on replication accuracy are evaluated, and a general pattern of the real-time filling ratio is proposed. The in-situ observation system is used to study the real-time shape evolution and curvature of PMMA microstructures.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Materials Science, Ceramics
Xiaohua Liu, Kangsen Li, Jun Shen, Feng Gong
Summary: A universal and scalable method for creating broadband nanostructured AR surfaces on transparent glass for solar cell applications was demonstrated using hot embossing and ultrasonic vibration demolding. Glass nanopillars with varying diameters were successfully fabricated, exhibiting excellent AR properties when tested under different wavelengths and angles of incidence. Optical modeling was also developed to evaluate the theoretical optical behaviors of the glass nanostructures, showing promise for applications in solar cells, displays, and laser systems.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Jai-Hua Lee, Pei-Song Chee, Eng-Hock Lim, Jen-Hahn Low, Nam-Trung Nguyen
Summary: Inspired by the Kirigami structure, a self-powered electroactive-based sensor with improved conformality has been successfully developed. It has been found that this structure significantly enhances the sensitivity of the sensor.
ADVANCED ENGINEERING MATERIALS
(2022)
Article
Engineering, Electrical & Electronic
Jen-Hahn Low, Pei-Song Chee, Eng-Hock Lim
Summary: A frequency-switchable semiactive tag antenna is proposed, which can perform well on both on- and in-metal platforms. The tag is designed using a double H-slot antenna made of copper-clad polyimide film. The antenna structure includes a backing metallic cavity, making it robust for the in-metal platform. The antenna shape can be changed by integrating metal-coated ionic polymer-metal composite (IPMC) actuators with the double H-slot antenna to achieve frequency reconfiguration. A water-embedded substrate made of a polydimethylsiloxane (PDMS) container filled with water is employed to miniaturize the antenna. Good maximum read ranges (>10 m) have been achieved in all cases.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Shin-Yi Ooi, Pei-Song Chee, Eng-Hock Lim, Jen-Hahn Low, Fwee-Leong Bong
Summary: The zeroth-order resonance of a compact patch structure is studied for designing a metal-mountable tag antenna in the US ultrahigh-frequency (UHF) radio frequency identification (RFID) passband. The proposed single-element zeroth-order resonator (ZOR) structure, consisting of a cap-shaped patch loaded with two L-shaped slots and coupled to the ground through two inductive stubs, provides sufficient antenna impedance for a conjugate match with the RFID chip impedance. This tag antenna exhibits good omnidirectional radiation characteristics with vertically polarized fields when placed on a metallic surface, and has a stable read distance of approximately 15 m with even coverage in the entire azimuth plane.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Green & Sustainable Science & Technology
Muhammad Nur Aiman Uda, Subash C. B. Gopinath, Uda Hashim, Muhammad Nur Afnan Uda, Tijjani Adam, Nor Azizah Parmin, Sreeramanan Subramaniam, Suresh V. Chinni, Veeranjaneya Reddy Lebaka, Ramachawolran Gobinath
Summary: Rice is increasingly exposed to inorganic arsenic, affecting half of the world population as rice consumers. This study investigated the effects of silica and graphene nanomaterials treatment on varied arsenic levels, and found that silica nanoparticles showed the highest inhibition on arsenic accumulation. Arsenic adversely affected plant growth and even caused death at high concentrations, but silica nanoparticles demonstrated potential in reducing consumer health risks.
Article
Engineering, Chemical
Kok Tong Lee, Pei Song Chee, Eng Hock Lim, Yu Heng Kam
Summary: This work presents a cost-effective data glove made of a commercial nylon-based glove with integrated polyethylene-carbon composites (Velostat) for fine motion control in virtual reality (VR). The strain sensor based on Velostat's piezoresistive behavior was characterized, and a data acquisition circuit was designed to process the sensor's output for controlling the 3D virtual hand's movement. The data glove was also coupled with inertial measurement unit sensors to identify its coordinates and successfully demonstrated in a VR environment by picking-and-placing multiple objects.
CHEMICAL ENGINEERING & TECHNOLOGY
(2023)
Review
Engineering, Chemical
Hussaini Adam, Subash C. B. Gopinath, M. K. Md Arshad, Tijjani Adam, Uda Hashim, Zaliman Sauli, Makram A. Fakhri, Sreeramanan Subramaniam, Yeng Chen, Sreenivasan Sasidharan, Yuan Seng Wu
Summary: This study presents an electrochemically-based microfluidic nanobiosensor array for monoplex and multiplex detection of physiologically relevant analytes. The integrated system is portable and serves as a custom electrochemical reader. It has great potential for real-time profiling of immune-mediated treatment responses and as a point-of-care diagnostic device for conducting near-patient tests using biological samples.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2023)
Article
Biochemistry & Molecular Biology
Hussaini Adam, Subash C. B. Gopinath, Thirumananseri Kumarevel, M. K. Md Arshad, Tijjani Adam, Zaliman Sauli, Sreeramanan Subramaniam, Uda Hashim, Yeng Chen
Summary: In this study, a novel technique for the selective detection of amyloid fibrils was reported. Using a dipole moment on a dielectrode surface, this technique can sensitively detect the aggregation of alpha-synuclein, which is crucial for diagnosing Parkinson's disease. The stability and detection range of the sensor were confirmed through physical and electrical characterization.
PROCESS BIOCHEMISTRY
(2023)
Article
Multidisciplinary Sciences
Muthukannan Murugesh, Eng-Hock Lim, Pei-Song Chee, Fwee-Leong Bong
Summary: This paper proposes a polarization-insensitive planar patch antenna with a large embedded serial capacitance for constructing a metal mountable tag using only a single radiator. The antenna structure contains two closely overlapped flaps of patches, generating a large capacitive reactance to reduce the resonant frequency of the tag. The reverse surface currents in the overlapped region are utilized to produce orthogonal fields, enabling the tag antenna to be readable from almost all directions above the metal surface.
SCIENTIFIC REPORTS
(2023)
Review
Biotechnology & Applied Microbiology
Hussaini Adam, Subash C. B. Gopinath, M. K. Md Arshad, Tijjani Adam, N. A. Parmin, Irzaman Husein, Uda Hashim
Summary: In severe cases, Parkinson's disease causes uncontrolled movements known as motor symptoms such as dystonia, rigidity, bradykinesia, and tremors. Parkinson's disease also causes non-motor symptoms such as insomnia, constipation, depression and hysteria. Disruption of neural networks in the substantia nigra pars compacta is a major cause of motor symptoms in Parkinson's disease, highlighting the need for better methods of detection. Improved diagnosis and treatment of Parkinson's disease can help avoid some of its devastating symptoms.
Review
Multidisciplinary Sciences
A. L. Olatomiwa, Tijjani Adam, C. O. Edet, A. A. Adewale, Abdullah Chik, Mohammed Mohammed, Subash C. B. Gopinath, U. Hashim
Summary: This review provides a comprehensive overview of articles on the electronic and optical properties of graphene using density functional theory and machine learning approaches. It summarizes the thermodynamic stability parameters of various doped graphene systems and discusses the strengths and uncertainties of the used models and potentials. Future studies should explore the thermal properties, heterostructure modeling, superconducting behavior, and optimization of DFT models to enhance the potential of graphene.
Article
Engineering, Multidisciplinary
Xian Feng Hor, Pei Ling Leow, Mohamed Sultan Mohamed Ali, Pei Song Chee, Shahrulnizahani Mohammad Din, Wen Pin Gooi
Summary: Conventional electrical capacitance tomography (ECT) is commonly used for fluid flow monitoring in pipelines. However, there is limited research on electrode design for on-chip ECT, especially for three-dimensional imaging. This study investigated different electrode configurations and optimized the dimensions for sensitivity distribution. Simulation and experimental results show that dual sensing planes with central electrodes enable successful three-dimensional imaging.
ENGINEERING RESEARCH EXPRESS
(2023)
Proceedings Paper
Materials Science, Multidisciplinary
Kok Tong Lee, Pei Song Chee, Eng Hock Lim, Chu Chen Lim
Summary: This article presents a smart glove with object recognition capabilities using support vector machine. The glove utilizes resistive flex sensors to recognize objects with an accuracy of 91.88%. It provides a promising low-cost solution for healthcare and robotics industries.
MATERIALS TODAY-PROCEEDINGS
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
Muthukannan Murugesh, Eng-Hock Lim, Pei-Song Chee
Summary: This paper introduces a compact tag antenna for metal mountable applications. The antenna is made up of two pairs of E-shaped patches placed orthogonally to generate hemi-isotropic radiation. The tag resonant frequency can be fine-tuned by adjusting the E-shaped arms.
2022 IEEE 12TH INTERNATIONAL CONFERENCE ON RFID TECHNOLOGY AND APPLICATIONS (RFID-TA)
(2022)
Article
Engineering, Electrical & Electronic
Jen-Hahn Low, Pei-Song Chee, Eng-Hock Lim
Summary: For the first time, a wearable antenna incorporating liquid metal and an elastomer platform has been designed. The liquid metal is injected into a flexible substrate to create a fluidic slot antenna and a liquid EBG structure, which mitigates the effects of the human body and improves antenna performance. The antenna has a high gain and low specific absorption rate, and its impedance bandwidth is stable even in humid environments.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Review
Chemistry, Analytical
Tijjani Adam, Thikra S. Dhahi, Subash C. B. Gopinath, Uda Hashim
Summary: Nanowires are widely used in the generation of high-performance nanosensors, attracting attention due to their submicron feature and potential in various applications. The electrical properties of nanowires make them promising for numerous applications, and their sensitivity and properties can be tuned through size and dopant concentration control for reproducibility.
CRITICAL REVIEWS IN ANALYTICAL CHEMISTRY
(2022)
