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High-speed imaging and coumarin dosimetry of horn type ultrasonic reactors: Influence of probe diameter and amplitude

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Ultrasonics Sonochemistry 2025年 119卷 107362页

作者： Viciconte, Gianmaria Sarvothaman, Varaha P. Guida, Paolo Truscott, Tadd T. Roberts, William L. Clean Energy Research Platform King Abdullah University of Science and Technology Thuwal23955-6900 Saudi Arabia Department of Mechanical Engineering Physical Science and Engineering Division King Abdullah University of Science and Technology Thuwal23955-6900 Saudi Arabia Splash Lab King Abdullah University of Science and Technology Thuwal 825001 23955-6900 Saudi Arabia

Ultrasound driven cavitation is widely used to intensify lab and industrial-scale processes. Various studies and experiments demonstrate that the acoustic energy, dissipated through the bubbles collapse, leads to intense physico-chemical effects in the processed liquid. A better understanding of these phenomena is crucial for the optimization of ultrasonic reactors, and their scale-up. In the current literature, the visual characterization of the reactor is mainly carried out with sonoluminescence and sonochemiluminescence. These techniques have limitations in the time resolution since a high camera exposure time is required. In this research, we proposed an alternative method, based on coumarin dosimetry to monitor the hydroxylation activity, and high-speed imaging for the visualization of the vapor field. By this approach, we aim to capture the structure and the dynamics of the vapor field and to correlate this with the chemical effects induced in the ultrasonic reactor. This characterization was carried out for four different ultrasonic probe diameters (3, 7, 14 and 40 mm), displacement amplitudes and processing volumes. Key findings indicate that the probe diameter strongly affects the structure of the vapor field and the chemical effectiveness of the system. The proposed methodology could be applied to characterize other types of ultrasonic reactors with different operating and processing conditions. © 2025 The Authors

关键词： Dosimetry

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3D Crumpled Ultrathin 1T MoS2 for Inkjet Printing of Mg-Ion Asymmetric Micro-supercapacitors (vol 14, pg 7308, 2020)

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ACS NANO 2020年第10期14卷 14247-14247页

作者： Shao, Yuanlong Fu, Jui-Han Cao, Zhen Song, Kepeng Sun, Ruofan Wan, Yi Shamim, Atif Cavallo, Luigi Han, Yu Kaner, Richard B. Tung, Vincent C. College of Energy Soochow Institute for Energy and Materials Innovations (SIEMIS) Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province Soochow University Suzhou 215006 People’s Republic of China Physical Science and Engineering (PSE) Division King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Saudi Arabia Physical Science and Engineering (PSE) Division King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Saudi Arabia Physical Science and Engineering (PSE) Division King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Saudi Arabia Physical Science and Engineering (PSE) Division King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Saudi Arabia Physical Science and Engineering (PSE) Division King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Saudi Arabia Physical Science and Engineering (PSE) Division King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Saudi Arabia Electrical Engineering Program Computer Electrical and Mathematical Sciences (CEMS) Division KAUST Thuwal 23955-6900 Saudi Arabia Physical Science and Engineering (PSE) Division King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Saudi Arabia Physical Science and Engineering (PSE) Division King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Saudi Arabia Department of Chemistry and Biochemistry Department of Materials Science and Engineering California NanoSystems Institute (CNSI) University of California Los Angeles Los Angeles California 90095 United States Physical Science and Engineering (PSE) Division King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Saudi Arabia

Metallic molybdenum disulfide (MoS2), e.g., 1T phase, is touted as a highly promising material for energy storage that already displays a great capacitive performance. However, due to its tendency to aggregate and restack, it remains a formidable challenge to assemble a high-performance electrode without scrambling the intrinsic structure. Here, we report an electrohydrodynamic-assisted fabrication of 3D crumpled MoS2 (c-MoS2) and its formation of an additive-free stable ink for scalable inkjet printing. The 3D c-MoS2 powders exhibited a high concentration of metallic 1T phase and an ultrathin structure. The aggregation-resistant properties of the 3D crumpled particles endow the electrodes with open space for electrolyte ion transport. Importantly, we experimentally discovered and theoretically validated that 3D 1T c-MoS2 enables an extended electrochemical stable working potential range and enhanced capacitive performance in a bivalent magnesium-ion aqueous electrolyte. With reduced graphene oxide (rGO) as the positive electrode material, we inkjet-printed 96 rigid asymmetric micro-supercapacitors (AMSCs) on a 4-in. Si/SiO2 wafer and 100 flexible AMSCs on photo paper. These AMSCs exhibited a wide stable working voltage of 1.75 V and excellent capacitance retention of 96% over 20 000 cycles for a single device. Our work highlights the promise of 3D layered materials as well-dispersed functional materials for large-scale printed flexible energy storage devices.

关键词： supercapacitors MoS2 printing technique Mg-ion microdevice

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Radical-mediated electrical enzyme assay for estradiol: Toward point-of-care diagnostics

Device

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Device 2025年

作者： Jang, Hyun-June Joung, Hyou-Arm Shi, Xiaoao Ding, Rui Wagner, Justine Tang, Erting Zhuang, Wen Ryu, Byunghoon Chen, Guanmin Jerry Yeo, Kiang-Teck Huang, Jun Chen, Junhong Pritzker School of Molecular Engineering University of Chicago Chicago 60637 IL United States Chemical Sciences and Engineering Division Physical Sciences and Engineering Directorate Argonne National Laboratory Lemont 60439 IL United States Kompass Diagnostics Inc. Chicago 60651 IL United States School of Chemistry and Biochemistry Georgia Tech Polymer Network Georgia Institute of Technology Atlanta 30332 GA United States School of Materials Science and Engineering Georgia Tech Polymer Network Georgia Institute of Technology Atlanta 30332 GA United States Center for Organic Photonics and Electronics Georgia Tech Polymer Network Georgia Institute of Technology Atlanta 30332 GA United States Department of Mechanical Engineering Inha University Incheon 22212 South Korea Department of Pathology The University of Chicago Chicago 60637 IL United States Pritzker School of Medicine The University of Chicago Chicago 60637 IL United States

The diagnosis and prognosis of many conditions such as cardiovascular, neurodegenerative, and reproductive disorders often require repeat monitoring of small molecules, proteins, hormones, or other biomarkers with a high analytical sensitivity. We developed a radical-mediated electrical enzyme assay (REEA) in a paper-based fluidic cartridge ($0.55/test) with a handheld reader utilizing field-effect transistors to measure estradiol (E2), a key hormone in reproductive care. The system demonstrated a detection limit of 146 fg/mL, a coefficient of variation below 9.2%, and an accuracy of 0.963 across 19–4,551 pg/mL in clinical plasma samples, with results delivered in under 10 min. The REEA method presents a high-sensitivity electrochemical transducing system and can be used to detect other high-sensitivity biomarkers, including cardiac troponin and tau proteins associated with Alzheimer's disease. © 2025 The Author(s)

关键词： DTI-3: Develop estradiol field-effect transistor biosensors immunoassay paper-based fluidics POC diagnostics proton sensing radical-mediated electrical enzyme assays remote-gate women's health

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Structural changes induced by electric currents in a single crystal of Pr2CuO4

arXiv

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arXiv 2023年

作者： Roy, Susmita Ye, Feng Morgan, Zachary Mathur, Kabir Parulekar, Anish Jalali, Syed I.A. Zhang, Yu Cao, Gang Kaneko, Nobu-Hisa Greven, Martin Raj, Rishi Reznik, Dmitry Department of Physics University of Colorado at Boulder BoulderCO80309 United States Neutron Scattering Division Oak Ridge National Laboratory Oak RidgeTN37830 United States Materials Science and Engineering Program Department of Mechanical Engineering University of Colorado Boulder BoulderCO80309 United States Ibaraki Tsukuba305-8563 Japan School of Physics and Astronomy University of Minnesota MinneapolisMN55455 United States Center for Experiments on Quantum Materials University of Colorado at Boulder BoulderCO80309 United States

We demonstrate a novel approach to the structural and electronic property modification of perovskites, focusing on Pr2CuO4, an undoped parent compound of a class of electron-doped copper-oxide superconductors. Currents were passed parallel or perpendicular to the copper-oxygen layers with the voltage ramped up until a rapid drop in the resistivity was achieved, a process referred to as"flash". The current was then further increased tenfold in current-control mode. This state was quenched by immersion into liquid nitrogen. Flash can drive many compounds into different atomic structures with new properties, whereas the quench freezes them into a_long-lived state. Single-crystal neutron diffraction of as-grown and modified Pr2CuO4 revealed a √10x√10 superlattice due to oxygen-vacancy order. The diffraction peak intensities of the superlattice of the modified sample were significantly enhanced relative to the pristine sample. Raman-active phonons in the modified sample were considerably sharper. Measurements of electrical resistivity, magnetization and two-magnon Raman scattering indicate that the modification affected only the Pr-O layers, but not the Cu-O planes. These results point to enhanced oxygen-vacancy order in the modified samples well beyond what can be achieved without passing electrical current. Our work opens a new avenue toward electric field/quench control of structure and properties of layered perovskite oxides. © 2023, CC BY.

关键词： Electronic properties

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Two-Dimensional Nonlinear Mixing Between a Dissipative Kerr Soliton and Continuous Waves for a Higher-Dimension Frequency Comb

arXiv

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arXiv 2023年

作者： Moille, Grégory Li, Christy Stone, Jordan Chojnacky, Michal Shandilya, Pradyoth Chembo, Yanne K. Dutt, Avik Menyuk, Curtis Srinivasan, Kartik Joint Quantum Institute NIST University of Maryland College Park United States Microsystems and Nanotechnology Division National Institute of Standards and Technology Gaithersburg United States University of Maryland Baltimore County BaltimoreMD United States Institute for Research in Electronics and Applied Physics University of Maryland College ParkMD United States Department of Mechanical Engineering Institute for Physical Science and Technology University of Maryland College ParkMD20742 United States

Dissipative Kerr solitons (DKSs) intrinsically exhibit two degrees of freedom through their group and phase rotation velocity. Periodic extraction of the DKS into a waveguide produces a pulse train and yields the resulting optical frequency comb’s repetition rate and carrier-envelope offset, respectively. Here, we demonstrate that it is possible to create a system with a single repetition rate but two different phase velocities by employing dual driving forces. By recasting these phase velocities into frequencies, we demonstrate, experimentally and theoretically, that they can mix and create new phase-velocity light following any four-wave mixing process, including both degenerately pumped and non-degenerately pumped effects. In particular, we show that a multiple-pumped DKS may generate a two-dimensional frequency comb, where cascaded nonlinear mixing occurs in the phase velocity dimension as well as the conventional mode number dimension, and where the repetition rate in each dimension differs by orders of magnitude. © 2023, CC BY.

关键词： Pulse repetition rate

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Sensing fugitive hydrogen emissions

Nature Reviews Electrical Engineering

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Nature Reviews Electrical engineering 2024年第4期1卷 210-211页

作者： Yichen Cai Kuo-Wei Huang Sudipta Chatterjee Khaled N. Salama Lain-Jong Li Chemistry Program Division of Physical Sciences and Engineering and KAUST Catalysis Center King Abdullah University of Science and Technology Thuwal Saudi Arabia Agency for Science Technology and Research Institute of Materials Research and Engineering and Institute of Sustainability for Chemicals Energy and Environment Singapore Singapore Department of Chemistry Birla Institute of Technology and Science − Pilani K.K. Birla Goa Campus Zuarinagar India Advanced Membranes and Porous Materials Center and Division of Computer Electrical and Mathematical Science and Engineering King Abdullah University of Science and Technology Thuwal Saudi Arabia Department of Mechanical Engineering University of Hong Kong Hong Kong P. R. China

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Near-Unity Emitting, Widely Tailorable and Stable Exciton Concentrators Built from Doubly Gradient 2D Semiconductor Nanoplatelets

arXiv

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arXiv 2023年

作者： Liang, Xiao Durmusoglu, Emek G. Lunina, Maria Hernandez-Martinez, Pedro Ludwig Valuckas, Vytautas Yan, Fei Lekina, Yulia Sharma, Vijay Kumar Yin, Tingting Ha, Son Tung Shen, Ze Xiang Sun, Handong Kuznetsov, Arseniy Demir, Hilmi Volkan LUMINOUS Center of Excellence for Semiconductor Lighting and Displays The Photonics Institute School of Electrical and Electronic Engineering Nanyang Technological University Singapore639798 Singapore Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Singapore637371 Singapore Interdisciplinary Graduate Program Nanyang Technological University Singapore637371 Singapore 2 Fusionopolis Way #08-03 Innovis 138634 Singapore UNAM-Institute of Materials Science and Nanotechnology The National Nanotechnology Research Center Department of Electrical and Electronics Engineering Department of Physics Bilkent University Bilkent Ankara06800 Turkey

The strength of electrostatic interactions (EI) between electrons and holes within semiconductor nanocrystals profoundly impact the performance of their optoelectronic systems, and different optoelectronic devices demand distinct EI strength of the active medium. However, achieving a broad range, fine-tuning of the EI strength for specific optoelectronic applications is a daunting challenge, especially in quasi 2-dimensional core-shell semiconductor nanoplatelets (NPLs), as the epitaxial growth of the inorganic shell along the direction of the thickness that solely contributes to the quantum confined effect significantly undermines the strength of the EI. Herein we propose and demonstrate a novel doubly-gradient (DG) core-shell architecture of semiconductor NPLs for on-demand tailoring of the EI strength by controlling the localized exciton concentration via in-plane architectural modulation, demonstrated by a wide tuning of radiative recombination rate and exciton binding energy. Moreover, these exciton-concentration-engineered DG NPLs also exhibit a near-unity quantum yield, remarkable thermal and photo stability, as well as considerably suppressed self-absorption. As proof-of-concept demonstrations, highly efficient color converters and high-performance light-emitting diodes (external quantum efficiency: 16.9%, maximum luminance: 43, 000 cd/m2) have been achieved based on the DG NPLs. This work thus opens up new avenues for developing high-performance colloidal optoelectronic device applications. Copyright © 2023, The Authors. All rights reserved.

关键词： Quantum yield

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All-antiferromagnetic electrically controlled memory on silicon featuring large tunneling magnetoresistance

arXiv

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arXiv 2023年

作者： Shi, Jiacheng Lopez-Dominguez, Victor Arpaci, Sevdenur Sangwan, Vinod K. Mahfouzi, Farzad Kim, Jinwoong Athas, Jordan G. Hamdi, Mohammad Aygen, Can Phatak, Charudatta Carpentieri, Mario Jiang, Jidong S. Grayson, Matthew A. Kioussis, Nicholas Finocchio, Giovanni Hersam, Mark C. Amiri, Pedram Khalili Department of Electrical and Computer Engineering Northwestern University EvanstonIL60208 United States Universitat Jaume I Castellón12006 Spain Applied Physics Program Northwestern University EvanstonIL60208 United States Department of Materials Science and Engineering Northwestern University EvanstonIL60208 United States Department of Physics and Astronomy California State University Northridge NorthridgeCA91330 United States Materials Science Division Argonne National Laboratory LemontIL60439 United States Department of Electrical and Information Engineering Politecnico di Bari Bari Italy Department of Mathematical and Computer Sciences Physical Sciences and Earth Sciences University of Messina Messina98166 Italy Department of Chemistry Northwestern University EvanstonIL60208 United States

Antiferromagnetic (AFM) materials are a pathway to spintronic memory and computing devices with unprecedented speed, energy efficiency, and bit density. Realizing this potential requires AFM devices with simultaneous electrical writing and reading of information, which are also compatible with established silicon-based manufacturing. Recent experiments have shown tunneling magnetoresistance (TMR) readout in epitaxial AFM tunnel junctions. However, these TMR structures were not grown using a silicon-compatible deposition process, and controlling their AFM order required external magnetic fields. Here we show three-terminal AFM tunnel junctions based on the noncollinear antiferromagnet PtMn3, sputter-deposited on silicon. The devices simultaneously exhibit electrical switching using electric currents, and electrical readout by a large room-temperature TMR effect. First-principles calculations explain the TMR in terms of the momentum-resolved spin-dependent tunneling conduction in tunnel junctions with noncollinear AFM electrodes. Copyright © 2023, The Authors. All rights reserved.

关键词： Silicon

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Tumor Location-weighted MRI-Report Contrastive Learning: A Framework for Improving the Explainability of Pediatric Brain Tumor Diagnosis

arXiv

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arXiv 2024年

作者： Ketabi, Sara Wagner, Matthias W. Hawkins, Cynthia Tabori, Uri Ertl-Wagner, Birgit Betina Khalvati, Farzad Neurosciences and Mental Health Research Program The Hospital for Sick Children Toronto Canada Department of Mechanical and Industrial Engineering University of Toronto Toronto Canada Vector Institute for Artificial Intelligence Toronto Canada Institute of Medical Science University of Toronto Toronto Canada Department of Computer Science University of Toronto Toronto Canada Department of Diagnostic and Interventional Radiology The Hospital for Sick Children Toronto Canada Department of Diagnostic and Interventional Neuroradiology University Hospital Augsburg Augsburg Germany Division of Hematology and Oncology The Hospital for Sick Children Toronto Canada Paediatric Laboratory Medicine Division of Pathology The Hospital for Sick Children Toronto Canada Department of Medical Imaging University of Toronto Toronto Canada

Despite the promising performance of convolutional neural networks (CNNs) in brain tumor diagnosis from magnetic resonance imaging (MRI), their integration into the clinical workflow has been limited. That is mainly due to the fact that the features contributing to a model's prediction are unclear to radiologists and hence, clinically irrelevant, i.e., lack of explainability. As the invaluable sources of radiologists' knowledge and expertise, radiology reports can be integrated with MRI in a contrastive learning (CL) framework, enabling learning from image-report associations, to improve CNN explainability. In this work, we train a multimodal CL architecture on 3D brain MRI scans and radiology reports to learn informative MRI representations. Furthermore, we integrate tumor location, salient to several brain tumor analysis tasks, into this framework to improve its generalizability. We then apply the learnt image representations to improve explainability and performance of genetic marker classification of pediatric Low-grade Glioma, the most prevalent brain tumor in children, as a downstream task. Our results indicate a Dice score of 31.1% between the model's attention maps and manual tumor segmentation (as an explainability measure) with test classification performance of 87.7%, significantly outperforming the baselines. These enhancements can build trust in our model among radiologists, facilitating its integration into clinical practices for more efficient tumor diagnosis. Copyright © 2024, The Authors. All rights reserved.

关键词： Pediatrics

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Heterogeneous Robot-Assisted Services in Isolation Wards: A System Development and Usability Study

Heterogeneous Robot-Assisted Services in Isolation Wards: A ...

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IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS)

作者： Youngsun Kwon Soyeon Shin Kyonmo Yang Seongah Park Soomin Shin Hwawoo Jeon Kijung Kim Guhnoo Yun Sangyong Park Jeewon Byun Sang Hoon Kang Kyoung-Ho Song Doik Kim Dong Hwan Kim Kapho Seo Sonya S. Kwak Yoonseob Lim Artificial Intelligence and Robotics Institute Korea Institute of Science and Technology Seoul South Korea Interactive Robotics R&D Division Korea Institute of Robotics & Technology Convergence Pohang South Korea Department of Mechanical Engineering Ulsan National Institute of Science and Technology Ulsan South Korea Softnet Corporation Seoul South Korea Department of Physical Therapy and Rehabilitation Science School of Medicine University of Maryland Baltimore MD Department of Internal Medicine Seoul National University Bundang Hospital Seoul National University College of Medicine Seongnam South Korea

Isolation wards operate in quarantine rooms to prevent cross-contamination caused by infectious diseases. Behind the benefits, medical personnel can have the infection risk from patients and the heavy workload due to the isolation. This work proposes a robot-assisted system to alleviate these problems in isolation wards. We conducted a survey about the medical staff's difficulties and envisioning robots. Using the investigation result, we devised three valuable services using two kinds of heterogeneous robots: telemedicine, emergency alert, and delivery services by care robots and delivery robots. Our system also provides user-interactive components such as a dashboard for medical staff and a patient app for inpatients. To manage the services efficiently, we suggest the robotic system based on a central control server and a hierarchical management architecture. Through a user study, we reviewed the usability of the developed system and its future directions.

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