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Haptic interface with multimodal tactile sensing and feedback for human–robot interaction Micro Nano Syst. Lett. Pub Date : 2024-03-14 Mingyu Kang, Cheol-Gu Gang, Sang-Kyu Ryu, Hyeon-Ju Kim, Da-Yeon Jeon, Soonjae Pyo
Novel sensing and actuation technologies have notably advanced haptic interfaces, paving the way for more immersive user experiences. We introduce a haptic system that transcends traditional pressure-based interfaces by delivering more comprehensive tactile sensations. This system provides an interactive combination of a robotic hand and haptic glove to operate devices within the wireless communication
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Possibility of large-area carbon nanotube films formation through spray coating Micro Nano Syst. Lett. Pub Date : 2024-03-04 Jinkyeong Kim, TaeGu Lee, Ji-Hoon Han, Joon Hyub Kim
This study deals with the process of developing and optimizing the spray coating method for large-area deposition of carbon nanotubes. Carbon nanotubes have excellent electrical and thermal properties and strength, so they are used in various fields of application. However, existing deposition methods have limitations. In this study, the possibility of the spray coating method for large-area deposition
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Exploring graphene structure, material properties, and electrochemical characteristics through laser-induced temperature analysis Micro Nano Syst. Lett. Pub Date : 2024-02-27 Na-Kyoung Yang, Yoo-Kyum Shin, Saeyoung Park, Sang-Min Kim, Bon-Jae Koo, Joonsoo Jeong, Min-Ho Seo
Laser-induced graphene (LIG) is a three-dimensional graphene structure fabricated through the irradiation of a polymer substrate with laser energy (or fluence, equivalently). This methodology offers a cost-effective and facile means of producing 3D nanostructures, yielding graphene materials characterized by extremely high surface area and superior electrical properties, rendering them advantageous
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Quasi-statically actuated MEMS scanner with concentric vertical comb electrodes Micro Nano Syst. Lett. Pub Date : 2024-01-31 Daehwan Chae, Do-hyeon Jeong, Seong-jong Yun, Kyoung-woo Jo, Jong-Hyun Lee
A quasi-static (QS) MEMS mirror scanner with concentric vertical combs (CVC) is presented. The increase rate of overlapped area of the CVC, tends to show larger values and more uniform than that of conventional vertical combs, resulting in improved linearity and scanning angle, respectively. In this paper, the performance of the QS scanner with CVC, whose equivalent mirror diameter is 3.9 mm, was theoretically
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Comprehensive study and scientific process to increase the accuracy in estimating the thermal conductivity of nanofluids containing SWCNTs and CuO nanoparticles using an artificial neural network Micro Nano Syst. Lett. Pub Date : 2024-01-10 Mohammad Hemmat Esfe, Fatemeh Amoozad, Hossein Hatami, Davood Toghraie
This investigation aimed to evaluate the thermal conductivity ratio (TCR) of SWCNT-CuO/Water nanofluid (NF) using experimental data in the T range of 28–50 ℃ and solid volume fraction range of SVF = 0.03 to 1.15% by an artificial neural network (ANN). MLP network with Lundberg-Marquardt algorithm (LMA) was utilized to predict data (TCR) by ANN. In the best case, from the set of various structures of
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Study on repetitive damage-recovery cycle of hydrophobic coating for electrowetting-on-dielectric (EWOD) applications Micro Nano Syst. Lett. Pub Date : 2024-01-08 Youngdoo Son, Woochan Kim, Daeyoung Lee, Sang Kug Chung
This study is focusing on the durability of fluoropolymer hydrophobic coatings against falling droplets. Devices such as smart self-cleaning lens or droplet-based energy generators are open-air electrowetting-on-dielectric (EWOD) devices, which are applications that utilize falling droplets. Therefore, the hydrophobic coatings of these devices are exposed to environment factors such as raindrop, and
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SnO2 nanostructure-based acetone sensors for breath analysis Micro Nano Syst. Lett. Pub Date : 2024-01-04 Arunkumar Shanmugasundaram, Karthikeyan Munirathinam, Dong-Weon Lee
The World Health Organization reports that metabolic disorders are responsible for a significant proportion of global mortality. Considering this, breath sensors have gained prominence as effective tools for monitoring and diagnosing metabolic disorders, thanks to recent advancements in science and technology. In human exhaled breath, over 870 distinct volatile organic components (VOCs) have been identified
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Electrohydrodynamic (EHD) printing of nanomaterial composite inks and their applications Micro Nano Syst. Lett. Pub Date : 2024-01-03 Rizwan Ul Hassan, Mirkomil Sharipov, WonHyoung Ryu
The utilization of high-resolution printed flexible electronic devices is prevalent in various fields, including energy storage, intelligent healthcare monitoring, soft robotics, and intelligent human–machine interaction, owing to its compact nature and mechanical flexibility. The EHD jet printing technology has the potential to develop the field of printing industry through its ability to fabricate
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PCB-based digital microfluidic platform for droplet mixing on an open surface Micro Nano Syst. Lett. Pub Date : 2024-01-03 Hyunwoo Kim, Sang Kug Chung, Jeongmin Lee
This paper presents a digital microfluidic (DMF) platform based on a printed circuit board (PCB) for droplet mixing. Mixing droplets without a top cover plate is important for bio-chemical analysis. For this reason, a more efficient mixing method is required especially for mixing a viscous liquid droplet in an open surface. Here, to improve the performance of droplet mixing, we propose the integration
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Uniform formation and characterization of Au/TiO2 nanoparticles for electrokinetically assisted optofluidic reactors Micro Nano Syst. Lett. Pub Date : 2023-12-15 Eunseok Seo, Jaehyun Jung, Cong Wang, Jungyul Park
Research is being conducted on photocatalyst-based organic compound treatment processes for water purification to decompose wastewater efficiently. An optofluidic reactor based on TiO2 photocatalysis and nanoelectrokinetics was presented recently to improve the efficacy of photocatalytic water purification. However, inefficient absorption of visible light by TiO2 materials hinders the effective utilization
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Synthesis and optoelectronic properties of an anthracene derivative Micro Nano Syst. Lett. Pub Date : 2023-12-15 Darya Khan, Zhang Xiaotao, Muhammad Hasnain Jameel, Mohd Arif Bin Agam, Muhammad Sufi Bin Roslan, Majed A. Bajaber
An asymmetric a-side alkyl chain anthracene derivative 6-(4 (-2 Ethyl Octyl) Phenyl) 2Phenyl Anthracene (EOPPA) was designed based on a π-electron skeleton with a side alkyl chain of anthracene core molecule. EOPPA was found to be a sturdy and high-performance p-type semiconductor for optoelectronic applications. The creation has successfully made this new material EOPPA with the best solubility, which
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Visual and tactile perception techniques for braille recognition Micro Nano Syst. Lett. Pub Date : 2023-12-14 Byeong-Sun Park, Seong-Min Im, Hojun Lee, Young Tack Lee, Changjoo Nam, Sungeun Hong, Min-gu Kim
In the case of a visually impaired person, literal communication often relies on braille, a system predominantly dependent on vision and touch. This study entailed the development of a visual and tactile perception technique for braille character recognition. In the visual perception approach, a braille character recognition was performed using a deep learning model (Faster R-CNN–FPN–ResNet-50), based
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Unidirectional freeze casting of compressible metallic aerogel composed of freeze-dried cellulose nanofibers and silver nanowires Micro Nano Syst. Lett. Pub Date : 2023-12-14 Donghyun Lee, Jungwook Choi
Metallic aerogels have attracted tremendous interest because of their superior properties, such as low density, high electrical conductivity, and large specific surface area. However, extremely brittle connections in their 3D networks remain a challenge. In this study, compressible aerogels with microporous fiber-like structure consisting of freeze-dried cellulose nanofibers (CNFs) and silver nanowires
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Sense-based user interface platform for behavioral pattern analysis of young children Micro Nano Syst. Lett. Pub Date : 2023-12-06 Sangmin Lee, Jaehwan Jang, Young Tack Lee, Min-gu Kim
This paper presents a system integration of a sense-based user interface (SUI) platform, comprised of flexible pressure and humidity sensor arrays with a commercial inertial measurement unit (IMU), to analyze behavioral patterns of young children. The pressure sensors utilize a sensor array created using flexible inkjet printing, with each sensor using a piezoresistive sensing layer. The humidity sensors
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Dispersion and agglomeration of carbon nanoclusters in 4-(trans-4′-hexylcyclohexyl)-isothiocyanatobenzene media on ITO and graphene surfaces: role of surface effect Micro Nano Syst. Lett. Pub Date : 2023-11-30 Archana Kumari Singh, Satya Pal Singh
We have synthesized carbon nanoparticles using mandarin juice via green synthesis rout. We have doped carbon nanoparticles in liquid crystal media and studied the surface effect on self-assembly of carbon nanoclusters on ITO coated glass surface and on graphene sheet. The purpose of this study is to construct uniform nano-micro droplets for novel applications and to understand and explore the underlying
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Development of an amperometric sensor for epinephrine determination using an Azure A/silver nanocluster modified electrode Micro Nano Syst. Lett. Pub Date : 2023-11-29 C. Priya, S. Anuja, R. Suresh Babu, S. Sriman Narayanan
A novel electrochemical sensor was developed for the detection of Epinephrine (EP) utilizing Azure A (AzA), a phenothiazine dye, and citrate-capped silver nanoparticles. The interaction between Azure A and silver nanoparticles facilitated the formation of AzA/silver nanoclusters through a self-assembled approach. The morphological analysis of AzA/silver nanoclusters was conducted using field-emission
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Silicon nanoparticles: fabrication, characterization, application and perspectives Micro Nano Syst. Lett. Pub Date : 2023-11-23 Taeyeong Kim, Jungchul Lee
Silicon nanoparticles have emerged as pivotal components in nanoscience and nanoengineering due to their inherent characteristics such as high energy capacity and outstanding optical properties. Numerous fabrication and characterization techniques have been researched so far, while a range of applications utilizing them have been developed. In this review, we aim to provide a brief overview of the
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Microfluidic thrombosis analysis system: possibilities and limitations Micro Nano Syst. Lett. Pub Date : 2023-11-23 Dong-Hwi Ham, Ji-Seob Choi, Jin-Ho Choi, Woo-Tae Park
Thrombosis is a double-edged sword. Normal thrombus formation within injured blood vessel is an important natural defensive mechanism to prevent excessive bleeding, whereas abnormal thrombus formation leads to critical disease such as stroke or myocardial infarction. One of keys in the pathophysiology mechanism involved in the thrombus formation is acute hemodynamic changes within the vessel lumen
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Plasma dicing before grinding process for highly reliable singulation of low-profile and large die sizes in advanced packages Micro Nano Syst. Lett. Pub Date : 2023-11-18 Keunhoi Kim, Jongcheol Park, Kyoungmin Kim, TaeHyun Kim, SooHyun Kwon, Yeeun Na
The demand for advanced packaging is driven by the need for low-profile, densely-integrated, large-die Si devices in substrate-based or wafer-level packaging. Die strength is a critical parameter for ultrathin dies, making die singulation a vital aspect of advanced packaging technology. In this work, we present a dicing before grinding (DBG) process to compare and analyze die strengths using a mechanical
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Fabrication and characterization of silicon-on-insulator wafers Micro Nano Syst. Lett. Pub Date : 2023-11-13 Taeyeong Kim, Jungchul Lee
Silicon-on-insulator (SOI) wafers offer significant advantages for both Integrated circuits (ICs) and microelectromechanical systems (MEMS) devices with their buried oxide layer improving electrical isolation and etch stop function. For past a few decades, various approaches have been investigated to make SOI wafers and they tend to exhibit strength and weakness. In this review, we aim to overview
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Rheological behavior of 10W40 base oil containing different combinations of MWCNT-Al2O3 nanoparticles and determination of the target nano-lubricant for industrial applications Micro Nano Syst. Lett. Pub Date : 2023-10-31 Mohammad Hemmat Esfe, Soheyl Alidoust, Hossein Hatami, Davood Toghraie
The main goal of this research is to compare the rheological behavior of hybrid nano lubricants (HNLs) with different composition ratios in a base oil. The purpose of the comparison is to determine the HNL with the best lubrication performance at the start of the vehicle. Theoretical methods have confirmed the non-Newtonian behavior in different laboratory conditions. HNLs with the composition ratio
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Designing wearable capacitive pressure sensors with arrangement of porous pyramidal microstructures Micro Nano Syst. Lett. Pub Date : 2023-10-24 Reza Javidi, Mahdi Moghimi Zand, Sara Alizadeh Majd
Capacitive pressure sensors are essential for advanced applications like wearable medical devices, electronic skins, and biological signal detection systems. Enhancing sensitivity in these sensors is achieved by incorporating porous microstructures into the dielectric layer. The present research focuses on designing a capacitive pressure sensor comprising a porous micro-pyramidal dielectric layer featuring
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Evaluation of stability and functionality of zinc oxide nanofluids for enhanced oil recovery Micro Nano Syst. Lett. Pub Date : 2023-10-19 Lengu Peter Tuok, Marwa Elkady, Abdelrahman Zkria, Tsuyoshi Yoshitake, Usama Nour Eldemerdash
Nanofluids for enhanced oil recovery offer a breakthrough solution towards tertiary recovery and consequently higher oil production. Their ability to reduce interfacial tension, alteration of formation’s wettability, higher adsorption capacity, and acceleration of disjoining pressure makes them excellent candidates for enhanced oil recovery. The main objective of this paper is to investigate the effect
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Current status and further development of deterministic lateral displacement for micro-particle separation Micro Nano Syst. Lett. Pub Date : 2023-10-04 Alexander Zhbanov, Ye Sung Lee, Sung Yang
Deterministic lateral displacement (DLD) is a passive, label-free, continuous-flow method for particle separation. Since its discovery in 2004, it has been widely used in medical tests to separate blood cells, bacteria, extracellular vesicles, DNA, and more. Despite the very simple idea of the DLD method, many details of its mechanism are not yet fully understood and studied. Known analytical equations
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Non-fullerene acceptor based photoelectric material for retinal prosthesis Micro Nano Syst. Lett. Pub Date : 2023-09-28 Hyunsun Song, Hyeonhee Roh, Jae Young Kim, Byung Chul Lee, Bright Walker, Maesoon Im
Microelectronic retinal implants can restore a useful level of artificial vision in photoreceptor-damaged retina. Previously commercialized retinal prostheses require transocular connection lines to an external power supply and/or for data transmission, which are unwieldy and may cause unwanted side effects, such as infections. A recently reported wireless device used a rigid silicon substrate. However
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Investigation of LIG-based pressure sensors with various silicon-based elastomeric encapsulation layers Micro Nano Syst. Lett. Pub Date : 2023-09-27 Yoo-Kyum Shin, Ki-Hoon Kim, Min-Ho Seo
Laser-induced graphene (LIG) has attracted significant interest in the field of pressure sensors owing to the high sensitivity associated with its inherent three-dimensional porous structure. However, the brittleness of fabricated LIG poses a critical challenge in terms of durability. To address this issue, current research on LIG-based pressure sensors has focused on the utilization of Si-elastomer
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Overcoming delamination in two-photon lithography for improving fabrication of 3D microstructures Micro Nano Syst. Lett. Pub Date : 2023-09-22 Cheol Woo Ha
Two-photon lithography has emerged as a highly effective method for fabricating intricate three-dimensional (3D) microstructures. It enables the rapid fabrication of 3D microstructures, unlike conventional two-dimensional nanopatterning. Researchers have extensively investigated two-photon polymerization (TPP) for the fabrication of diverse 3D micro/nanodevices with high resolution. TPP can be applied
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Sweat-permeable electronic skin with a pattern of eyes for body temperature monitoring Micro Nano Syst. Lett. Pub Date : 2023-09-15 Jeong Hyeon Kim, Daniel J. Joe, Han Eol Lee
Human-machine interface has been considered as a prominent technology for numerous smart applications due to their direct communication between humans and machines. In particular, wearable electronic skins with a free form factor have received a lot of attention due to their excellent adherence to rough and wrinkled surfaces such as human skin and internal organs. However, most of the e-skins reported
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Fabrication and evaluation of a flexible temperature sensor array using multi-layer ceramic capacitors for spatial temperature mapping Micro Nano Syst. Lett. Pub Date : 2023-09-13 Ji-Sung Yoon, Kwang-Seok Yun
This paper presents the development of a flexible temperature sensor array using multi-layer ceramic capacitors. By integrating the capacitors into a 5 × 5 array on a polydimethylsiloxane (PDMS) substrate, we exploit the principle of changing dielectric constant with temperature, which results in a change in capacitance. Our sensor array demonstrates a consistent decrease in capacitance with increasing
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Improved recovery of NO2 sensors using heterojunctions between transition metal dichalcogenides and ZnO nanoparticles Micro Nano Syst. Lett. Pub Date : 2023-09-11 Leilei Wang, Jungwook Choi
The stable recovery of gas sensors is an important indicator for evaluating their performance. Hitherto, the use of external light sources and/or an increase in the operating temperature has been effective in improving the recovery rate of gas sensors. Herein, heterojunctions were formed between the two-dimensional transition metal dichalcogenide nanosheets and zero-dimensional ZnO nanoparticles to
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Hydrophobic surface for direct PEGDA micro-pattern fabrication Micro Nano Syst. Lett. Pub Date : 2023-06-07 Anna Danielak, Juhee Ko, Aminul Islam, David Bue Pedersen, Jungchul Lee
Photopolymerization of hydrogels films has gained interest in many biomedical and industrial fields. Hydrogel micro-patterns fabricated directly on a device are used as filtering barriers, however, due to weak mechanical properties, these parts require a stable support but deposition of hydrogel in non-polymerized state brings a risk of sinking inside the structure. These limitations can be overcome
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Advancements in visible-light-driven double perovskite nanoparticles for photodegradation Micro Nano Syst. Lett. Pub Date : 2023-05-22 Runia Jana, P. Mary Rajaitha, Sugato Hajra, Hoe Joon Kim
Perovskites are of significant interest in the field of photocatalysis. To date, many perovskite nanostructures have been developed, and their applications in photocatalysis have been studied. There has been considerable improvement in the research on metal doping in the perovskite structure to improve their optical and structural properties. This mini-review examines the recent progress in the synthesis
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Stimuli-responsive polymer-based bioinspired soft robots Micro Nano Syst. Lett. Pub Date : 2023-05-08 Swati Panda, Sugato Hajra, P. Mary Rajaitha, Hoe Joon Kim
Soft robotics enables various applications in certain environments where conventional rigid robotics cannot deliver the same performance due to their form factor and stiffness. Animals use their soft external organs to carry out activities in response to challenging natural environments efficiently. The objective of soft robots is to provide biologically inspired abilities and enable adaptable and
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3D printing fabrication process for fine control of microneedle shape Micro Nano Syst. Lett. Pub Date : 2023-01-02 Jeong, Jinwoong, Park, Jaeu, Lee, Sanghoon
Microneedle electrode (ME) is used to monitor bioelectrical signals by penetrating via the skin, and it compensates for a limitation of surface electrodes. However, existing fabrication of ME have limited in controlling the shape of microneedles, which is directly relevant to the performance and durability of microneedles as an electrode. In this study, a novel method using 3D printing is developed
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Quantitative image analysis of thrombus formation in microfluidic in-vitro models Micro Nano Syst. Lett. Pub Date : 2022-12-20 Choi, Ji-Seob, Ham, Dong-Hwi, Kim, Jung-Hyun, Marcial, Helem Betsua Flores, Jeong, Pyeong-Ho, Choi, Jin-Ho, Park, Woo-Tae
In this study, we present a method to quantitatively analyze the thrombus formation process through image analysis in an in vitro thrombus model with a circular cross section. The thrombus model used was designed based on the mechanism between the physical principle of wall shear rate (WSR) and thrombus formation. Image analysis was used to help visualize the thrombus formation process and calculate
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Simulation of Germanium-on-Nothing cavity’s morphological transformation using deep learning Micro Nano Syst. Lett. Pub Date : 2022-12-08 Jeong, Jaewoo, Kim, Taeyeong, Lee, Jungchul
Unique self-assembled germanium structures known as Germanium-on-Nothing (GON), which are fabricated via annealing, have buried multiscale cavities with different morphologies. Due to their unique sub-surface morphologies, GON structures are utilized in various applications including optoelectronics, micro-/nanoelectronics, and precision sensors. Each application requires different cavity shapes, and
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Wet anisotropic etching characteristics of Si{111} in NaOH-based solution for silicon bulk micromachining Micro Nano Syst. Lett. Pub Date : 2022-12-01 Purohit, S., Swarnalatha, V., Pandey, A. K., Pal, P.
Silicon bulk micromachining is extensively employed method in microelectromechanical systems (MEMS) for the formation of freestanding (e.g., cantilevers) and fixed (e.g., cavities) microstructures. Wet anisotropic etching is a popular technique to perform silicon micromachining as it is low-cost, scalable, and suitable for large scale batch processing, which are the major factors considered in the
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Effect of channel height on the critical particle diameter in a deterministic lateral device Micro Nano Syst. Lett. Pub Date : 2022-11-30 Bae, Jae Hyun, Zhbanov, Alexander, Yang, Sung
The separation of biological cells or microorganisms in a liquid based on their size by deterministic lateral displacement is widely used in laboratories. The analytical equation for the critical diameter is derived under the assumption that flow between two posts is better described by flow in a rectangular tube than between parallel plates. The height position of the particle is an additional parameter
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Design and simulation of a neural interface based on a microfluidic flexible interconnection cable for chemical delivery Micro Nano Syst. Lett. Pub Date : 2022-11-19 Kang, Yoo Na, Chu, Jun-Uk, Lee, Kang-Ho, Lee, Yongkoo, Kim, Sohee
Neural interfaces are fundamental tools for transmitting information from the nervous system. Research on the immune response of an invasive neural interface is a field that requires continuous effort. Various efforts have been made to overcome or minimize limitations through modifying the designs and materials of neural interfaces, modifying surface characteristics, and adding functions to them. In
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Influence of multiple stenoses on thrombosis formation: an in vitro study Micro Nano Syst. Lett. Pub Date : 2022-11-19 Flores Marcial, Helem B., Choi, Jiseob, Ham, Donghwi, Kim, Junghyun, Jeong, Pyeongho, Choi, Jinho, Park, Woo-Tae
Multiple lesions in the same vessel is one of the most common situations found in patients suffering from cardiovascular diseases, this complicates not only the assessment of the severity of each one but also their treatment. To date, the effect of multiple stenoses on different parameters has been simulated by numerical studies. Few others have implemented in vitro platforms for their investigation
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Highly stretchable strain sensors with improved sensitivity enabled by a hybrid of carbon nanotube and graphene Micro Nano Syst. Lett. Pub Date : 2022-11-12 Wang, Leilei, Choi, Jungwook
The development of high-performance strain sensors has attracted significant attention in the field of smart wearable devices. However, stretchable strain sensors usually suffer from a trade-off between sensitivity and sensing range. In this study, we investigate a highly sensitive and stretchable piezoresistive strain sensor composed of a hybrid film of 1D multi-walled carbon nanotube (MWCNT) and
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In-vivo recording of sensory signals from peripheral nerves using flexible 3D neural electrodes Micro Nano Syst. Lett. Pub Date : 2022-11-02 Park, Byungwook, Jang, Jae-Won, Kim, Sohee
To overcome the limitations of muscle-based prostheses, studies on nerve-based prostheses for sensory feedback have recently been reported. To develop such prostheses, intrafascicular electrodes, a type of peripheral nerve interface, are essentially used to connect the nervous system and external systems. Through these electrodes, sensory feedback to induce sensations in patients is possible. To evoke
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A 3D-printed pneumatic dispenser with monitoring droplet ejection Micro Nano Syst. Lett. Pub Date : 2022-10-31 Kang, Dong Kwan, Park, Jeong Woo, Lee, Sangmin
In this study, a pneumatic dispenser driven by a flexible membrane with a capacitive-type sensor using an SLA-type 3D printer was fabricated. It was confirmed that a single droplet in the range of approximately 400–450 nL could be ejected from the current processed 200-μm-diameter nozzle. The deformation varied according to the magnitude and time of the positive pressure applied to the membrane sensor
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Methods to analyze extracellular vesicles at single particle level Micro Nano Syst. Lett. Pub Date : 2022-10-28 Kwon, Yongmin, Park, Jaesung
Extracellular vesicles (EVs) are nano-sized vesicles derived from cells that transport biomaterials between cells through biofluids. Due to their biological role and components, they are considered as potential drug carriers and for diagnostic applications. Today's advanced nanotechnology enables single-particle-level analysis that was difficult in the past due to its small size below the diffraction
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SnO2/rGO nanocomposite for the detection of biomarkers of lung cancer Micro Nano Syst. Lett. Pub Date : 2022-09-16 Shanmugasundaram, Arunkumar, Lee, Dong-Weon
Metal oxide-based sensors have been widely used to detection biomarkers in exhaled breath for identification of various diseases such as asthma, diabetes, halitosis, and lung cancer. Herein, we proposed one step hydrothermal method for the preparation of SnO2 nanospheres and reduced graphene oxide incorporated SnO2 nanospheres for the detection of two important biomarkers such as decane and heptane
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Optimization of deep reactive ion etching for microscale silicon hole arrays with high aspect ratio Micro Nano Syst. Lett. Pub Date : 2022-09-09 Kim, Taeyeong, Lee, Jungchul
During deep reactive ion etching (DRIE), microscale etch masks with small opening such as trenches or holes suffer from limited aspect ratio because diffusion of reactive ions and free radicals become progressively difficult as the number of DRIE cycle increases. For this reason, high aspect ratio structures of microscale trenches or holes are not readily available with standard DRIE recipes and microscale
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Microarray detection method for pathogen genes by on-chip signal amplification using terminal deoxynucleotidyl transferase Micro Nano Syst. Lett. Pub Date : 2022-08-22 Kim, Tai-Yong, Lim, Min-Cheol, Lim, Jeong-A, Choi, Sung-Wook, Woo, Min-Ah
A microarray detection method based on on-chip signal amplification using terminal deoxynucleotidyl transferase (TdT) was developed to visualize pathogenic genes. Cyclic olefin copolymer (COC) substrate for microarrays was treated with oxygen plasma to induce hydrophilic surface properties. The capture probe DNA was immobilized on the COC surface by UV irradiation. The 3ʹ end of the capture probe DNA
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Enhanced etching characteristics of Si{100} in NaOH-based two-component solution Micro Nano Syst. Lett. Pub Date : 2022-08-01 Swarnalatha, V., Purohit, S., Pal, P., Sharma, R. K.
Silicon wet bulk micromachining is the most widely used technique for the fabrication of diverse microstructures such as cantilevers, cavities, etc. in laboratory as well as in industry for micro-electromechanical system (MEMS) application. Although, increasing the throughput remains inevitable, and can be done by increasing the etching rate. Furthermore, freestanding structure release time can be
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Carbon nanotube-graphene hybrids for soft electronics, sensors, and actuators Micro Nano Syst. Lett. Pub Date : 2022-07-19 Pyo, Soonjae, Eun, Youngkee, Sim, Jaesam, Kim, Kwanoh, Choi, Jungwook
Soft devices that are mechanically flexible and stretchable are considered as the building blocks for various applications ranging from wearable devices to robotics. Among the many candidate materials for constructing soft devices, carbon nanomaterials such as carbon nanotubes (CNTs) and graphene have been actively investigated owing to their outstanding characteristics, including their intrinsic flexibility
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Textile-type triboelectric nanogenerator using Teflon wrapping wires as wearable power source Micro Nano Syst. Lett. Pub Date : 2022-07-05 Kim, Seonghyeon, Cho, Woosung, Won, Dong-Joon, Kim, Joonwon
Wearable electronic devices such as mobile communication devices, portable computers, and various sensors are the latest significant innovations in technology which use the Internet of Things (IoT) to track personal data. Wearable energy harvesters are required to supply electricity to such devices for the convenience of users. In this study, a textile-type triboelectric nanogenerator (T-TENG), produced
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Multi-height micropyramids based pressure sensor with tunable sensing properties for robotics and step tracking applications Micro Nano Syst. Lett. Pub Date : 2022-06-10 Oh, Dongik, Seo, Jungyeon, Kim, Hang Gyeom, Ryu, Chaehyun, Bang, Sang-Won, Park, Sukho, Kim, Hoe Joon
Precise sensing of pressure is essential for various mechanical and electrical systems. The recent emergence of flexible pressure sensors has enabled novel applications, such as human–machine interfaces, soft robotics, and wearable devices. Specifically, the piezoresistive sensing scheme is widely adapted for flexible pressure sensors as it is simple and exhibits outstanding measurement sensitivity
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Surrogate model for optimizing annealing duration of self-assembled membrane-cavity structures Micro Nano Syst. Lett. Pub Date : 2022-06-06 Jeong, Mun Goung, Kim, Taeyeong, Lee, Bong Jae, Lee, Jungchul
We propose a scheme to establish a surrogate model for optimizing the annealing duration of the self-assembled membrane-cavity structures from hole patterned silicon wafers. Although it has been reported that the design space of post-annealing shape can be extended by increasing the dimensions of hole arrays, the annealing duration for large hole arrays has not been well examined. A two-dimensional
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Electrochemical activity of glassy carbon electrode modified with ZnO nanoparticles prepared Via Senna Alata L. leaf extract towards antiretroviral drug Micro Nano Syst. Lett. Pub Date : 2022-05-17 Ariyanta, Harits Atika, Roji, Fakhrur, Apriandanu, Dewangga Oky Bagus
The phytosynthesis method was used to prepare ZnO nanoparticles (ZnO NPs) via Senna alata L. leaf extract (SALE) by involving alkaloids, which play an essential role as a source of weak bases during the formation reaction of NPs. ZnO NPs on glassy carbon electrodes (GCE/ZnO NP) have been introduced to investigate its electrochemical activity towards the antiretroviral drug, lamivudine (3TC). Several
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Ethanol-sensing properties of cobalt porphyrin-functionalized titanium dioxide nanoparticles as chemiresistive materials that are integrated into a low power microheater Micro Nano Syst. Lett. Pub Date : 2022-04-19 Kim, Kwanhun, Kang, Yunsung, Bae, Kyubin, Kim, Jongbaeg
Gaseous ethanol detection has attracted significant interest owing to its practical applications such as in breath analysis, chemical process monitoring, and safety evaluations of food packaging. In this study, titanium dioxide (TiO2) nanoparticles functionalized with cobalt porphyrin (CoPP) are utilized as resistive ethanol-sensing materials, and are integrated with a suspended micro-heater for low
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Toluene sensing characteristics of tin oxide-based gas sensor deposited with various amounts of metalloporphyrin Micro Nano Syst. Lett. Pub Date : 2022-03-08 Cho, Byeonghwa, Kim, Jongbaeg
In this study, the sensing characteristics of tin oxide-based gas sensors deposit with different amounts of metalloporphyrin, which is a functionalization substance, are evaluated. The mass of metalloporphyrin deposited is 3, 10, 20, 30, and 40 mg for 5 different sensors prepared. The deposition of 3 mg of metalloporphyrin result in an island form of functionalization instead of a thin film; meanwhile
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Green synthesis of silver nanoparticles and its antibacterial activity using fungus Talaromyces purpureogenus isolated from Taxus baccata Linn. Micro Nano Syst. Lett. Pub Date : 2022-01-20 Sharma, Ankush, Sagar, Anand, Rana, Jagriti, Rani, Reena
The present study is focused on the synthesis of silver nanoparticles (AgNPs) utilizing endophytic fungus Talaromyces purpureogenus, isolated from Taxus baccata Linn. Extracellular extract of Talaromyces purpureogenus has shown occurrence of secondary metabolites viz. terpenoids and phenols. Gas chromatography-mass spectroscopy analysis showed the presence of 16 compounds. Techniques like Ultraviolet–visible
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Multiple ratiometric nanothermometry using semiconductor BiFeO3 nanowires and quantitative validation of thermal sensitivity Micro Nano Syst. Lett. Pub Date : 2022-01-10 Prashanthi, K., Krishna Mohan, K., Antić, Željka, Ahadi, Kaveh, Dramicanin, Miroslav D.
Here, we report a very sensitive, non-contact, ratio-metric, and robust luminescence-based temperature sensing using a combination of conventional photoluminescence (PL) and negative thermal quenching (NTQ) mechanisms of semiconductor BiFeO3 (BFO) nanowires. Using this approach, we have demonstrated the absolute thermal sensitivity of ~ 10 mK−1 over the 300–438 K temperature range and the relative
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Two-step hybrid process of movable part inside glass substrate using ultrafast laser Micro Nano Syst. Lett. Pub Date : 2021-12-17 Kim, Jeongtae, Kim, Sung-Il, Joung, Yeun-Ho, Choi, Jiyeon, Koo, Chiwan
We demonstrate a two-step hybrid process for fabricating movable parts inside glass substrate using the selective laser-induced etching (SLE) process that is consisted of laser-direct writing and wet chemical etching. To obtain an influence by the optical characteristics of a glass substrate when fabricating a 3D microstructure using the SLE, we analyzed the relationship of their dimensions between
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Micro multi-nozzle jet coating of organic thin film for organic light-emitting diode lighting devices Micro Nano Syst. Lett. Pub Date : 2021-12-17 Shin, Kwon-Yong, Kang, Mingyu, Cho, Kwan Hyun, Kang, Kyung-Tae, Lee, Sang-Ho
Uniform deposition across large areas of an organic layer is one of the challenges for the industrial application of solution-based organic light‐emitting diode (OLED). In this paper, we propose an organic thin film deposition method for OLED using a micro multi-nozzle jet coating process. The developed micro multi-nozzle jet head consists of eighteen nozzles (100 μm diameter), a side suction line
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Synthesis of metallic aluminum particles by electrolysis in aqueous solution Micro Nano Syst. Lett. Pub Date : 2021-12-08 Hosoya, Takefumi, Yonezawa, Takehiro, Yamauchi, Noriko, Nakashima, Kouichi, Kobayashi, Yoshio
The present work proposes a method for fabricating metallic Al particles in aqueous solution. An aqueous colloidal solution was prepared from an aqueous aluminum nitrate nonahydrate solution by electrolysis using metallic Al plates as the anode and cathode under ultrasonic irradiation in water at 25–45 °C. The sizes of the particles in the colloidal solutions prepared at 25, 35, and 45 °C were 76.3