Article
Chemistry, Physical
In-Yong Suh, Young -Jun Kim, Pin Zhao, Daniel Sanghyun Cho, Minki Kang, Zheng-Yang Huo, Sang-Woo Kim
Summary: Researchers developed a novel microbial-blocking textile that uses triboelectric charges induced by harvesting kinetic energy from human motion. The textile, which has opposite triboelectric properties of the outer and inner layers, achieves efficient airborne pathogen blocking through electrostatic repulsion. This self-powered textile offers a promising method for rapid blocking of airborne pathogens with low pressure loss.
Article
Chemistry, Medicinal
Wagner E. Richter, Leonardo J. Duarte, Roy E. Bruns
Summary: GAPT is a popular charge model with unique features that make it difficult to compare directly with standard partition schemes. Research explores its dynamic nature and how to obtain relevant parts of GAPT from static charge models. Additionally, a conceptual evaluation of charge models aims to explain the strong correlation between GAPT and QTAIM charges.
JOURNAL OF CHEMICAL INFORMATION AND MODELING
(2021)
Article
Obstetrics & Gynecology
LaTasha B. Craig, Sushila Arya, Heather R. Burks, Kaitlin Warta, Christen Jarshaw, Karl R. Hansen, Jennifer D. Peck
Summary: This study aimed to evaluate the relationship between semen regurgitation and intrauterine insemination (IUI) outcomes. The results showed that regurgitation during the IUI procedure is not related to pregnancy outcome.
FERTILITY AND STERILITY
(2021)
Article
Optics
Yan Wu, Xiaobo Hu, Yuhua Li, Ruipin Chen
Summary: Using the Richards-Wolf diffraction integral, the longitudinal energy evolution of fractional order vector vortex (FOVV) beams on the focal plane was studied. The existence of backflow energy was revealed when the binary topological charges satisfied specific conditions. Component circularly polarized vortex beams played significant roles in generating reverse energy flux. The longitudinal energy on the focal plane exhibited axial symmetry for FOVV beams with integer sums and differences of binary topological charges, but was disrupted when the sums or differences were not integers.
Article
Chemistry, Physical
Li-Zhen Sun, Wei-Ping Cao, Chang-Hui Wang, Xiaojun Xu
Summary: This paper investigates the external voltage-driven polymer translocation through a conical pore using Langevin dynamics simulation. The process is divided into an approaching stage and a threading stage. The results show that the apex angle of the pore influences the duration and behavior of the translocation process.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Chemistry, Physical
P. Dolganov, A. S. Zverev, K. D. Baklanova, V. K. Dolganov
Summary: The investigation revealed two different coalescence regimes when nematic and isotropic droplets coalesce, forming nematic and isotropic bridges in the circular meniscus and only isotropic bridges, respectively. The coalescence of nematic droplets starts near the cell surfaces, while isotropic droplets start coalescing in the middle of the cell. The breakup of the outer bridge during coalescence is a new example of Rayleigh-Plateau instability.
Article
Psychology, Clinical
Tianyu Liu, Xiantong Yang, Fanhua Meng, Qiang Wang
Summary: The purpose of this article is to develop and validate a measurement tool for teachers' time poverty, addressing the lack of research and objective measures in this area. Through online surveys and data analysis, it is found that teachers' time poverty is significantly associated with life satisfaction and time confusion tendency.
PSYCHOLOGY RESEARCH AND BEHAVIOR MANAGEMENT
(2023)
Article
Quantum Science & Technology
David Trillo, Thinh P. Le, Miguel Navascues
Summary: Consideration is given to the scenario in which a quantum particle is initially placed within a finite region and allowed to propagate freely. It is discovered that there are 'ultrafast' ('ultraslow') quantum states where the probability of arrival is higher (lower) than that of any classical particle prepared in the same region with the same momentum distribution. The quantum advantage for both projectiles and rockets is limited by the Bracken-Melloy constant c(bm), previously used to study quantum backflow, and it is proven that the conjecture c(bm)≥0.038 made 29 years ago is substantiated by the bounds 0.0315≤c(bm)≤0.072. Furthermore, in a modified projectile scenario with a fixed initial position distribution, the quantum advantage can reach 0.1262.
NPJ QUANTUM INFORMATION
(2023)
Article
Immunology
Evan J. Anderson, James D. Campbell, C. Buddy Creech, Robert Frenck, Satoshi Kamidani, Flor M. Munoz, Sharon Nachman, Paul Spearman
Summary: While clinical trials for COVID-19 vaccines in adults have progressed quickly, trials in children have not yet started. The direct impact of COVID-19 on children is significant, highlighting the importance of pediatric vaccination. Therefore, initiating phase 2 clinical trials for children should be a priority to address safety concerns and help in the recovery from COVID-19.
CLINICAL INFECTIOUS DISEASES
(2021)
Article
Nanoscience & Nanotechnology
Yongqiao Zhu, Shiquan Lin, Wenchao Gao, Miao Zhang, Chaogui Yang, Peizhong Feng, Cheng Xu, Zhong Lin Wang
Summary: This study investigates the influence of temperature on the contact electrification of substoichiometric oxide films, highlighting the impact of oxygen vacancies on the films' ability to capture positive charges. The results show that annealing under different atmospheres can lead to changes in the polarity of the films' surfaces, providing insights into the mechanisms behind electron transfer in contact electrification.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Computer Science, Interdisciplinary Applications
Cyril Bozonnet, Olivier Desjardins, Guillaume Balarac
Summary: This paper presents a novel traction open boundary condition to address issues encountered in simulations, demonstrating its accuracy and stability in various flow scenarios.
JOURNAL OF COMPUTATIONAL PHYSICS
(2021)
Article
Physics, Multidisciplinary
Adrian Ortega, Luis Benet, Hernan Larralde
Summary: In this study, a simple PT-symmetric tight-binding ring with an onsite energy is investigated analytically and numerically. It is found that the system exhibits an unbroken PT-symmetric phase if the onsite energy is nonzero. The spectrum is characterized by singularities in the complex parameter space and the behavior of eigenstates at large gain and loss strengths. Additionally, the transport properties of the system are studied, revealing the occurrence of backflow of density and the existence of singular eigenstates that do not depend on the strength of gain and loss.
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2022)
Article
Materials Science, Multidisciplinary
Changhui Song, Shicai Zhu, Liran Ma, Yu Tian, Jianbin Luo
Summary: Utilizing triboelectric charges on rubbed surface, contact trajectory visualization is achieved without the need for auxiliary devices, simplifying the overall system. The functional film material offers broad applicability and good stability in storing and displaying motion trajectories.
APPLIED MATERIALS TODAY
(2021)
Article
Physics, Particles & Fields
Nehal Mittal, P. Marios Petropoulos, David Rivera-Betancour, Matthieu Vilatte
Summary: We study the boundary manifestation of Ehlers' hidden Mobius symmetry in four-dimensional Ricci-flat spacetimes. By introducing Carrollian and Weyl geometric tools and using the boundary conformal group BMS4, we define the leading/subleading towers of electric/magnetic charges directly from the boundary dynamics and explore their behavior under the action of the Mobius duality group.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Long Jin, Zhaoyu Li, Haichao Huang, Xiang Chu, Weili Deng, Jieling Zhang, Yong Ao, Tianpei Xu, Guo Tian, Tao Yang, Lihua Tang, Weiqing Yang
Summary: This study proposes an experimental approach to regulate MXene fluorine groups by alkalization to validate its performance enhancement in triboelectric nanogenerator (TENG). It is found that compared with alkalized MXene-based TENGs, MXene-based TENG achieves significant enhancement in open-circuit voltage, short-circuit current, and output power, indicating its potential for flexible sensing and energy harvesting.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Chemistry, Physical
Chaeyoung Nam, Yujin Na, Sung Cheol Park, Hyunseung Kim, Chang Kyu Jeong, Geon-Tae Hwang, Kwi-Il Park
Summary: In response to the demand for wearable devices, a flexible magnetoelectric composite based on a 2-2 structure was developed for wearable magnetic devices. By conducting simulations and theoretical analysis, it was found that higher concentrations of CFO could generate higher magnetoelectric signals. This study provides a new avenue for wearable magnetoelectric energy harvesting.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Chemistry, Physical
Hyunseok Song, Jongmoon Jang, Mahesh Peddigari, Srinivas Pattipaka, Yuho Min, Kwi-Il Park, Chang Kyu Jeong, Han Eol Lee, Jung Hwan Park, Ho-Yong Lee, Woon-Ha Yoon, Jungho Ryu, Geon-Tae Hwang
Summary: In this study, Pb(Mg1/3Nb2/3)O-3-Pb(Zr,Ti)O-3 (PMN-PZT) single crystals doped with hardener Mn were used to develop a high-output magneto-mechano-electric (MME) generator. By doping with 0 to 0.8 mol% hardener Mn, the dielectric constant and dielectric loss of the PMN-PZT crystal gradually decreased. The Mn-modified MME device achieved an improved magnetoelectric coefficient of 783.09 V per cm center dot Oe and a root mean square output power of 3.3 mW when an alternating current magnetic field of 8 Oe was applied, which is 1.8 times higher than that of the MME generator without Mn-doping.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Chemistry, Physical
Hyunseok Ko, Wonkyeong Son, Min Sung Kang, Han Uk Lee, Chan-Yeup Chung, Seungwu Han, Changsoon Choi, Sung Beom Cho
Summary: Hydrovoltaics, an emerging technology, harvests energy from water using nanostructured materials. However, the lack of understanding of its principles has limited its advancement. This study presents the first multiscale and multiphysics model for hydrovoltaic phenomena, providing a detailed interpretation and analysis of its working principles. Experimental validation supports the model, which considers hydrodynamics, ion transport, chemical reactions, and electrostatics. Protonation and ionic dynamics are found to be key factors for electricity generation, while the asymmetric proton concentration gradient drives the electric potential. The study also investigates the effects of various parameters on the electrical performance of hydrovoltaic devices.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Review
Chemistry, Multidisciplinary
Dongwhi Choi, Younghoon Lee, Zong-Hong Lin, Sumin Cho, Miso Kim, Chi Kit Ao, Siowling Soh, Changwan Sohn, Chang Kyu Jeong, Jeongwan Lee, Minbaek Lee, Seungah Lee, Jungho Ryu, Parag Parashar, Yujang Cho, Jaewan Ahn, Il-Doo Kim, Feng Jiang, Pooi See Lee, Gaurav Khandelwal, Sang-Jae Kim, Hyun Soo Kim, Hyun-Cheol Song, Minje Kim, Junghyo Nah, Wook Kim, Habtamu Gebeyehu Menge, Yong Tae Park, Wei Xu, Jianhua Hao, Hyosik Park, Ju-Hyuck Lee, Dong-Min Lee, Sang-Woo Kim, Ji Young Park, Haixia Zhang, Yunlong Zi, Ru Guo, Jia Cheng, Ze Yang, Yannan Xie, Sangmin Lee, Jihoon Chung, Il-Kwon Oh, Ji-Seok Kim, Tinghai Cheng, Qi Gao, Gang Cheng, Guangqin Gu, Minseob Shim, Jeehoon Jung, Changwoo Yun, Chi Zhang, Guoxu Liu, Yufeng Chen, Suhan Kim, Xiangyu Chen, Jun Hu, Xiong Pu, Zi Hao Guo, Xudong Wang, Jun Chen, Xiao Xiao, Xing Xie, Mourin Jarin, Hulin Zhang, Ying-Chih Lai, Tianyiyi He, Hakjeong Kim, Inkyu Park, Junseong Ahn, Nghia Dinh Huynh, Ya Yang, Zhong Lin Wang, Jeong Min Baik, Dukhyun Choi
Summary: Serious climate changes and energy-related environmental problems are critical issues in the world. Triboelectric nanogenerators (TENGs) have become one of the most promising mechanical energy harvesters, offering a solution to reduce carbon emissions and save the environment. Considerable advancements have been made in theory, materials, devices, systems, circuits, and applications in the TENG field, and it has reached the stage of prototype development and commercialization.
Article
Chemistry, Physical
Kangchun Lee, Seho Sun, Hyunseok Ko, Sung Beom Cho, Ganggyu Lee, Dongsoo Lee, Taeseup Song, Ungyu Paik
Summary: Molybdenum (Mo) is a promising metal contact material for sub-3 nm semiconductor processes, but its high dissolution rate during the CMP process limits its practical application. In this study, a strategy to suppress Mo dissolution by manipulating its oxidation state via catalytic-oxidation reaction is reported. By using Fe catalyst with trace amounts of H2O2, insoluble MoO2 and Mo2O5 phases are formed, while minimizing the soluble MoO3 phase. Dissolution behaviors of Mo at different oxidation states were investigated, and the Gibbs free energies and dissolution kinetics in different Mo oxide phases were validated using density functional theory (DFT) calculation. The catalytic-oxidation reaction using Fe ions achieved an enhanced removal rate and minimized dissolution rate, showing potential for advanced semiconductor manufacturing processes.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Sungbin Im, Sam Yeon Cho, Jae-Hyeon Cho, Geon-Tae Hwang, Angus I. Kingon, Sang Don Bu, Wook Jo, Seung-Hyun Kim, Chang Kyu Jeong
Summary: The study focuses on the application of piezoelectric nanocomposites consisting of a polymer matrix and ceramic fillers in flexible, wearable, and self-powered electronic devices. The researchers found that a relaxor ferroelectric terpolymer matrix can enhance the piezoelectric output, leading to improved energy harvesting and sensor performance. This research provides important physical information about the interface between the polymer matrix and ceramic fillers in flexible piezoelectric nanocomposite applications.
APPLIED SURFACE SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Sung Sik Won, Hyunseung Kim, Jinkee Lee, Chang Kyu Jeong, Seung-Hyun Kim, Angus I. Kingon
Summary: We have developed ultra-high energy density capacitors using a new lead-free bismuth pyrochlore-based dielectric film material system. These capacitors, with a thickness of 2 μm, have demonstrated energy densities around 90 J/cm³ and low energy loss below 3%. The pyrochlore ceramic films used in these capacitors can withstand voltage strength up to 900 V.
MATERIALS TODAY PHYSICS
(2023)
Article
Chemistry, Physical
Hee-Seon Lee, Hyunseok Ko, Kyuyoung Heo, Heesoo Lee, Hyung Mi Lim
Summary: In this study, a simple and novel dispersion method is proposed to improve the dispersibility of zirconia nanoparticles (ZrO2 NPs) by doping yttrium (Y3+) to control the crystalline phase. The results show that ZrO2 NPs with acetate-based 3-yttria stabilized zirconia (A-3YSZ) precursor exhibited the most superior dispersibility due to its low surface energy. It is found to be an effective inorganic filler for improving the refractive index of an acrylate-based coating solution.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Article
Physics, Multidisciplinary
Giulio Fatti, Hyunseung Kim, Changwan Sohn, Minah Park, Yeong-won Lim, Zhuohan Li, Kwi-Il Park, Izabela Szlufarska, Hyunseok Ko, Chang Kyu Jeong, Sung Beom Cho
Summary: This article proposes a model based on mechanochemistry to explain the fundamental properties of triboelectrification. By studying the contact between gold and silicate glasses, it is observed that the triboelectric output varies greatly and experiences polarity inversions. The model suggests that electronic transfer is activated by mechanochemistry and the terminations exposed to contact determine the tribopolarity. It provides a unified framework to explain experimental observations and can be used to predict the triboelectric properties.
PHYSICAL REVIEW LETTERS
(2023)
Review
Chemistry, Multidisciplinary
Andris Sutka, Linards Lapcinskis, Delong He, Hyunseung Kim, Joseph D. Berry, Jinbo Bai, Maris Knite, Amanda V. Ellis, Chang Kyu Jeong, Peter C. Sherrell
Summary: This review summarizes the structure-property-performance relationship of polymer insulators in triboelectric nanogenerators and focuses on tools to enhance charge generation by altering the mechanical, thermal, chemical, and topographical properties of polymers. The use of additives to manipulate the polymer surface structure is also discussed. The link between these properties and the charging mechanism is explored, and pathways to engineer triboelectric charging are highlighted.
ADVANCED MATERIALS INTERFACES
(2023)
Article
Nanoscience & Nanotechnology
Giulio Fatti, Alessandra Ciniero, Hyunseok Ko, Han Uk Lee, Yujin Na, Chang Kyu Jeong, Sang-Geul Lee, Dongyub Kwak, Kwi-Il Park, Sung Beom Cho, Daniele Dini
Summary: The lack of theoretical understanding of triboelectrification has hindered the development of energy harvesting technologies like triboelectric nanogenerators. A model predictive of the triboelectric behavior of polytetrafluoroethylene is formulated, driving the development of improved nanogenerators. By using a combined computational-experimental approach, it is shown that defluorination enhances the triboelectric charging of polytetrafluoroethylene at the nanoscale, leading to a one-order-of-magnitude output increase in triboelectric nanogenerators.
ADVANCED ELECTRONIC MATERIALS
(2023)
Article
Chemistry, Physical
Hyeon Woo Kim, Joo Hyeong Han, Hyunseok Ko, Tuhin Samanta, Dong Geon Lee, Dong Won Jeon, Woongchan Kim, Yong-Chae Chung, Won Bin Im, Sung Beom Cho
Summary: Exploring the vast and veiled chemical spaces through synthesis is crucial in solid-state materials. This study focuses on navigating metal halides, particularly the coexistence of perovskites and their derivatives, which has restricted their exploration. By combining high-throughput density functional theory calculations and machine learning, the researchers systematically explore inorganic halide perovskite derivatives, charting the chemical spaces and predicting their electrical properties and thermal stability. The successful synthesis of new Cs3LuCl6 and its application in white-light-emitting diodes showcase the potential practical applications of inorganic metal halides.
ACS ENERGY LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Han Eol Lee, Chang Kyu Jeong
Summary: A new inorganic-based laser lift-off (ILLO) process using a BaTiO3 (BTO) sacrificial layer was developed for producing flexible thin-film micro-light-emitting diodes (mu LEDs). The process was optimized through theoretical simulations and experiments, including laser conditions and carrier substrate types. The successful application of the BTO sacrificial layer in the ILLO process was confirmed by material analyses. Vertically structured flexible mu LEDs were successfully fabricated using BTO-based delamination, demonstrating the potential of this method for next-generation electronics.
MRS COMMUNICATIONS
(2023)