Article
Materials Science, Multidisciplinary
Morgan McKay Monroe, Nicolas Fumeaux, Luis Guillermo Villanueva, Danick Briand
Summary: The global problem of electronic waste and concerns regarding traditional electronics manufacturing has led to the development of solution-processed, degradable electronics. This study presents a novel approach for fabricating fully printed piezoelectric transducers on paper substrates. The technology enables the creation of sustainable piezoelectric devices, such as force sensors and acoustic speakers, using green materials.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Multidisciplinary Sciences
Ling Li, Carl Goodrich, Haizhao Yang, Katherine R. Phillips, Zian Jia, Hongshun Chen, Lifeng Wang, Jinjin Zhong, Anhua Liu, Jianfeng Lu, Jianwei Shuai, Michael P. Brenner, Frans Spaepen, Joanna Aizenberg
Summary: This study investigates the underlying mechanisms of texture evolution in an evaporation-induced colloidal assembly process. The research shows that at the later stage of self-assembly, the colloidal crystal undergoes a gradual rotation facilitated by geometrically necessary dislocations (GNDs). The generation of GNDs is due to the tensile stress field along the meniscus direction during the constrained shrinkage of the colloidal crystal, leading to crystallographic rotation to accommodate the mechanical stress.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Engineering, Manufacturing
Qi Wang, Xufeng Yang, Haixin Zhao, Xiaowen Zhang, Guanglong Cao, Mingfa Ren
Summary: A multiobjective optimization methodology was developed to balance low cost and high quality of 3D woven composites (3DWC). A multiscale process simulation model was proposed to calculate microscopic residual stresses in 3DWC, validated by experimental measurement. A surrogate model was constructed to reduce computational amount, and the optimization utilizing genetic algorithm achieved a Pareto front, with considerations for overall cure cycle in the process optimization.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2021)
Article
Materials Science, Multidisciplinary
Gang Huang, Qingdong Zhang, Boyang Zhang, Shuo Li
Summary: The study found that the combined magnetic-vibration treatment is the most effective method for reducing residual stress, with greater effect than the sum of the individual treatments. By increasing the movement of dislocations and causing dislocation slip in the material, residual stress can be reduced.
RESULTS IN PHYSICS
(2021)
Article
Materials Science, Ceramics
Isabelle Bruant, Romain Carpentier, Mohamed Fat'hi, Frederic Pablo
Summary: This article investigates the actuating performance of functionally graded piezoelectric materials (FGPM) using the d33 mode actuation. The material properties vary continuously across the thickness direction, and the percolation phenomenon is taken into account. The optimization of the interdigitated electrode (IDE) design for FGPM is performed using finite element analysis, and the results are compared with the d31 mode actuation.
JOURNAL OF ELECTROCERAMICS
(2023)
Article
Materials Science, Composites
Jingyi Mo, Nathanael Leung, Urangua Jargalsaikhan, Hongbo Wan, Bin Zhu, Bo Su, Tan Sui
Summary: In this study, the mechanistic connection between microstructure and mechanical properties of a nacre-inspired composite material was investigated and addressed through quantifying phase-specific hardness, modulus, and residual stress. The findings demonstrated the potential of bioinspired synthetic architectures as a tuneable model system to investigate the design principles of more complex hierarchical biological materials.
COMPOSITES COMMUNICATIONS
(2022)
Article
Materials Science, Composites
Jiulong Shi, Yajie Zhang, Tingting Shan, Rongrui Chen, Juan Guo, Chaojun Gao, Guoqiang Zheng
Summary: Soft actuators based on bilayered film architecture, consisting of PVDF/LDPE layers and CNTs as an electrode layer, were successfully fabricated via blow film molding. With the swelling ability of PVDF in acetone vapor as a driving force, the PVDF/LDPE/CNTs films showed rapid self-powered sensing property and excellent sensing durability. Combined with a paper doll, the films demonstrated highly efficient energy conversion and sensing ability.
COMPOSITES COMMUNICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Syed Mamun Rasid, Aron Michael, Hemanshu Roy Pota
Summary: Micro-lens actuators with desired characteristics are important for micro-optics applications. However, there are no dynamic models available for considering the effect of driving voltage and residual stress. In this study, a dynamic analytical model of a piezoelectrically driven multi-layer micro-lens actuator is presented and validated. The model accurately predicts the dynamic behavior and can be applied to other multi-layered piezoelectric micro-structures, facilitating advanced control design for improving the dynamic response of piezoelectric actuators.
SENSORS AND ACTUATORS A-PHYSICAL
(2023)
Article
Physics, Applied
A. Borroto, S. Bruyere, S. Migot, J. F. Pierson, F. Muecklich, D. Horwat
Summary: This study investigates the growth kinetics of two-phase nanostructures formed in sputter-deposited thin films and how residual stress in the transition zone is governed by the nucleation, growth, and interaction of crystalline regions. The analysis of relevant parameters extracted from scanning electron microscopy images sheds new light on the kinetics of the crystalline-amorphous competitive growth phenomenon and the importance of residual stress measurements in exploring complex film microstructure growth mechanisms.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Automation & Control Systems
Jianxing Li, Shijing Zhang, Jie Deng, Yingxiang Liu
Summary: This work proposes a high-resolution focusing mechanism using a stepping piezoelectric actuator with bending-bending hybrid actuating units. A piezoelectric autofocus system based on a visual feedback algorithm is established, and a microscopic observation demonstration proves the feasibility of the focusing mechanism. This work provides new ideas and schemes for the design of various microscopes.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Astronomy & Astrophysics
Daniel Green, Yiwen Huang
Summary: The paper explores the quantum origin of non-Gaussian correlators in inflationary cosmologies and shows that their features are similar to their cosmological counterparts through the study of equal-time in-in correlators in flat space. By investigating the probability amplitude of exciting multiple detectors and the relationship with entangled states, the unique properties of the quantum vacuum are revealed.
Article
Materials Science, Ceramics
Mengye Yin, Minxia Fang, Lixue Zhang, Chao Zhou, Andong Xiao, Yuanchao Ji, Tianyu Ma, Xiaobing Ren
Summary: This study demonstrates that acceptor doping with Mn in lead-free piezoceramics leads to higher depolarization temperature and improved piezoelectric thermal stability. The clamping effect induced by acceptor doping is identified as the mechanism behind these enhancements.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Analytical
Almur A. S. Rabih, Mohammad Kazemi, Michael Menard, Frederic Nabki
Summary: This study presents a novel aluminum nitride-based out-of-plane piezoelectric MEMS actuator equipped with a capacitive sensing mechanism to track its displacement. The actuator can be integrated within PICs to align different chips.
Article
Chemistry, Physical
Yuxin Liu, Qingping Wang, Chunyang Lu, Tingting Xue, Biao Hu, Chao Zhang
Summary: We investigated the evolution of structure and microscopic residual stress at the SiC/Al interface during nanoindentation using molecular dynamics simulations. The results showed that microscopic residual stresses mainly distributed at the interface region, with the SiC side exhibiting higher stress levels. The indentation process led to a concentration of residual stress in the indentation area, with more severe stress on the SiC side. Fractured SiC atoms exacerbated the microsopic residual stress concentration at the interface, while Al released some of the stress through plastic deformation. Removing fractured SiC atoms in a timely manner is necessary to prevent complex residual stresses and improve the machining process of SiC/Al composites.
SURFACES AND INTERFACES
(2022)
Article
Engineering, Electrical & Electronic
Muhammad Haq Nawaz, Aron Michael, Hemanshu Roy Pota, Ssu-Han Chen, Syed Mamun, R. Rasid
Summary: This paper introduces the design and implementation of a robust resonant controller for damping the first resonant mode of a MEMS-based multi-layered prestressed piezoelectric cantilever beam. The controller design is based on a mixed negative-imaginary, passivity, and small-gain approach, and demonstrates effectiveness in reducing settling time. The controller shows robustness to changes in cantilever dynamics caused by variation in residual stress or driving voltage.
SENSORS AND ACTUATORS A-PHYSICAL
(2022)
Article
Chemistry, Analytical
Yong Kyoung Yoo, Gangeun Kim, Dongsung Park, Jinsik Kim, YoungSoo Kim, Hye Yun Kim, Seung Hoon Yang, Jeong Hoon Lee, Kyo Seon Hwang
SENSORS AND ACTUATORS B-CHEMICAL
(2020)
Article
Multidisciplinary Sciences
Dongtak Lee, Dongsung Park, Insu Kim, Sang Won Lee, Wonseok Lee, Kyo Seon Hwang, Jeong Hoon Lee, Gyudo Lee, Dae Sung Yoon
Summary: The study demonstrates the creation of an amyloid corona around a plasmonic nanoparticle for monitoring the degradation of amyloid when exposed to potential drugs, offering an appealing opportunity to reduce attrition problems in drug discovery for AD treatment.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Sang Won Lee, Wonseok Lee, Insu Kim, Dongtak Lee, Dongsung Park, Woong Kim, Jinsung Park, Jeong Hoon Lee, Gyudo Lee, Dae Sung Yoon
Summary: A new graphene-amyloid nanofibril hybrid e-textile yarn has been developed for the detection of NO2, showing better performance compared to traditional e-textile yarn. The practical use of combining the hybrid yarn with a light-emitting diode as a wearable gas sensor has been suggested.
Article
Chemistry, Multidisciplinary
Insu Kim, Dongtak Lee, Sang Won Lee, Jeong Hoon Lee, Gyudo Lee, Dae Sung Yoon
Summary: Utilizing biomimetic plasmonic Au nanoparticles for fibrinogen detection through cross-linking, this nanoscale coagulation-inspired method offers a rapid and efficient way to diagnose sepsis and cardiovascular diseases with low sample volume and high selectivity.
Article
Biophysics
Dohwan Lee, Jee Won Lee, Cheonjung Kim, Dongho Lee, Seok Chung, Dae Sung Yoon, Jeong Hoon Lee
Summary: A microfluidic paper-based large-volume preconcentrator (u-LVP) was developed for enrichment and purification of biomarkers using ion concentration polarization. This platform enables efficient separation and preconcentration of biomarkers, such as miRNA, from milliliter-scale samples, offering new opportunities for biomarker research.
BIOSENSORS & BIOELECTRONICS
(2021)
Article
Chemistry, Analytical
Jaehoon Kim, Junghyo Yoon, Jae-Yeong Byun, Hyunho Kim, Sewoon Han, Junghyun Kim, Jeong Hoon Lee, Han-Sang Jo, Seok Chung
Summary: This study proposes a novel microfluidic device for extracting blood plasma from whole blood without the need for external instrumentation, achieving a high extraction yield of 45%. The device features a unique design that integrates a membrane filter and microfluidic device to prevent leakage of extracted plasma and remaining blood cells.
Article
Chemistry, Multidisciplinary
Hyo Gi Jung, Dongtak Lee, Sang Won Lee, Insu Kim, Yonghwan Kim, Jae Won Jang, Jeong Hoon Lee, Gyudo Lee, Dae Sung Yoon
Summary: The higher the initial Young's modulus value of HAP/Col hydrogels, the higher the rate of degradation over time, but the drug release of hydrogels with higher initial E values appears to be significantly delayed.
Article
Chemistry, Analytical
Junghyo Yoon, Youngkyu Cho, Jaehoon Kim, Hyunho Kim, Kyuhwan Na, Jeong Hoon Lee, Seok Chung
Summary: Ion concentration polarization (ICP) is widely used in microfluidic systems for pre-concentration, particle separation, and desalination. A new ICP microfluidic system with only an ion-exchange membrane-coated channel was proposed, showing strong correlation between numerical and experimental investigations on electroconvective vortices and charged particle trajectories. This study has significant implications for the development and optimization of ICP microfluidic and electrochemical systems for biomarker concentration and separation to improve sensing reliability and detection limits in analytic chemistry.
Article
Biophysics
Jeong Hoon Lee, Pan Kee Bae, Hyunho Kim, Yoon Ji Song, So Yeon Yi, Jungsun Kwon, Joon-Seok Seo, Jeong-min Lee, Han-Sang Jo, Seon Mee Park, Hee Sue Park, Kyeong Seob Shin, Seok Chung, Yong Beom Shin
Summary: The on-site microfluidic serological assay proposed in the study allows for timely decisions to be made regarding patient status and population-wide screening for controlling the COVID-19 pandemic. The developed assay showed enhanced sensitivity and specificity for clinical samples of SARS CoV-2 patients, enabling daily monitoring of IgM/IgG titers and patterns to provide important insight into the immune response to the virus. Monitoring these titers promotes rapid on-site detection and comprehensive understanding of the immune response in COVID-19 patients.
BIOSENSORS & BIOELECTRONICS
(2021)
Article
Engineering, Biomedical
Kang Hyeon Kim, Kyung Wook Wee, CheonJung Kim, Don Hur, Jeong Hoon Lee, Yong Kyoung Yoo
Summary: In this study, we developed a rapid and low-cost, and disposable electrical sensor using an extended gate field-effect transistor (EGFET) to detect cTnI levels as well as pH. This biosensor showed good sensitivity and could be used for quick and affordable detection.
BIOMEDICAL ENGINEERING LETTERS
(2022)
Article
Chemistry, Analytical
Jae Won Jang, Hyunji Kim, Insu Kim, Sang Won Lee, Hyo Gi Jung, Kyo Seon Hwang, Jeong Hoon Lee, Gyudo Lee, Dongtak Lee, Dae Sung Yoon
Summary: In this study, we improved the selectivity and stability of colorimetric glucose sensors by adding erythrocyte membrane. The detection limit of the sensors was enhanced by functionalizing glucose-oxidase-coronated gold nanoparticles with erythrocyte membrane. The membrane proteins GLUT1 and AQP1 on the erythrocyte membrane were shown to be key components for selective glucose detection.
ANALYTICAL CHEMISTRY
(2022)
Article
Biophysics
Cheonjung Kim, Yong Kyoung Yoo, Na Eun Lee, Junwoo Lee, Kang Hyeon Kim, Seungmin Lee, Jinhwan Kim, Seong Jun Park, Dongtak Lee, Sang Won Lee, Kyo Seon Hwang, Sung Il Han, Dongho Lee, Dae Sung Yoon, Jeong Hoon Lee
Summary: A nanoelectrokinetic-assisted lateral flow assay platform is proposed to enhance the sensitivity and limit of detection for self-testing, especially in the context of the COVID-19 pandemic, by using a microfluidic paper-based preconcentrator. This preconcentration technique improved the performance of the lateral flow assay by 32-fold and increased the analytical sensitivity by 16.4%, offering a new opportunity for point-of-care testing and self-testing.
BIOSENSORS & BIOELECTRONICS
(2022)
Article
Biophysics
Jinhwan Kim, Cheonjung Kim, Jeong Soo Park, Na Eun Lee, Seungmin Lee, Sung-Yeon Cho, Chulmin Park, Dae Sung Yoon, Yong Kyoung Yoo, Jeong Hoon Lee
Summary: In this study, a non-powered preconcentrator (NPP) based on nanoelectrokinetics was proposed for the lateral flow assay (LFA) detection of SARS-CoV-2 antigen. The NPP, composed of glass fiber-based composite paper and ion perm-selective material, can be easily operated by force balancing. This approach enriches the SARS-CoV-2 viral nucleocapsid proteins and improves the limit of detection by up to 10-fold.
BIOSENSORS & BIOELECTRONICS
(2023)
Article
Chemistry, Analytical
Seungmin Lee, Yong Kyoung Yoo, Sung Il Han, Dongho Lee, Sung-Yeon Cho, Chulmin Park, Dongtak Lee, Dae Sung Yoon, Jeong Hoon Lee
Summary: We propose a novel approach that combines computer vision and lightweight machine learning to significantly enhance the performance of lateral flow assays, improving diagnostic efficacy and accessibility of point-of-care testing.
Article
Biochemical Research Methods
Junwoo Lee, Yong Kyoung Yoo, Dohwan Lee, Cheonjung Kim, Kang Hyeon Kim, Seungmin Lee, Seungmin Kwak, Ji Yoon Kang, Hyungsuk Kim, Dae Sung Yoon, Don Hur, Jeong Hoon Lee
Summary: Ion concentration polarization (ICP) is a preconcentration technique with the potential for high preconcentration factor, but faces challenges of instability and low efficiency under physiological conditions. A sequentially driven ICP process has been proposed to enhance the preconcentration of highly ionic raw samples without increasing the electric field, resulting in significant preconcentration factor and signal enhancement in enzyme-linked immunosorbent assay (ELISA) using tau protein.