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Conference on Lasers and Electro-Optics (CLEO)

作者： Andrey Baydin Manukumara Manjappa Sobhan Subhra Mishra Hongjing Xu Fuyang Tay Dasom Kim Felix G. G. Hernandez Paulo H. O. Rappl Eduardo Abramof Ranjan Singh Junichiro Kono Department of Electrical and Computer Engineering Rice University Houston Texas USA Smalley-Curl Institute Rice University Houston Texas USA Instrumentation and Applied Physics Department Indian Institute of Science Bangalore India Center for Disruptive Photonic Technologies The Photonics Institute Nanyang Technological University Singapore Department of Physics and Astronomy Rice University Houston Texas USA Applied Physics Graduate Program Smalley-Curl Institute Rice University Houston Texas USA Instituto de Física Universidade de São Paulo São Paulo SP Brazil Laboratório Associado de Sensores e Materiais Instituto Nacional de Pesquisas Espaciais São José dos Campos SP Brazil Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Singapore Department of Material Science and NanoEngineering Rice University Houston Texas USA

We have investigated the resonant coupling of photons with TO phonons in lead telluride in small-mode-volume terahertz cavities, observing a giant vacuum Rabi splitting on the order of the bare cavity–phonon frequency.

ISBN: (纸本)9781957171258

关键词： Electric fields Numerical simulation Optical constants Photons Physical vapor deposition Terahertz spectroscopy

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Control of brain network dynamics across diverse scales of space and time

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Physical Review E 2020年第6期101卷 062301-062301页

作者： Evelyn Tang Harang Ju Graham L. Baum David R. Roalf Theodore D. Satterthwaite Fabio Pasqualetti Danielle S. Bassett Department of Bioengineering School of Engineering & Applied Science University of Pennsylvania Pennsylvania 19104 USA Max Planck Institute for Dynamics and Self-Organization Göttingen 37079 Germany Neuroscience Graduate Program Perelman School of Medicine University of Pennsylvania Pennsylvania 19104 USA Department of Psychiatry Perelman School of Medicine University of Pennsylvania Pennsylvania 19104 USA Department of Mechanical Engineering University of California Riverside Riverside California 92521 USA Department of Physics & Astronomy College of Arts & Sciences University of Pennsylvania Pennsylvania 19104 USA Department of Electrical & Systems Engineering School of Engineering & Applied Science University of Pennsylvania Pennsylvania 19104 USA Department of Neurology Perelman School of Medicine University of Pennsylvania Pennsylvania 19104 USA Santa Fe Institute Santa Fe New Mexico 87501 USA

The human brain is composed of distinct regions that are each associated with particular functions and distinct propensities for the control of neural dynamics. However, the relation between these functions and control profiles is poorly understood, as is the variation in this relation across diverse scales of space and time. Here we probe the relation between control and dynamics in brain networks constructed from diffusion tensor imaging data in a large community sample of young adults. Specifically, we probe the control properties of each brain region and investigate their relationship with dynamics across various spatial scales using the Laplacian eigenspectrum. In addition, through analysis of regional modal controllability and partitioning of modes, we determine whether the associated dynamics are fast or slow, as well as whether they are alternating or monotone. We find that brain regions that facilitate the control of energetically easy transitions are associated with activity on short length scales and slow timescales. Conversely, brain regions that facilitate control of difficult transitions are associated with activity on long length scales and fast timescales. Built on linear dynamical models, our results offer parsimonious explanations for the activity propagation and network control profiles supported by regions of differing neuroanatomical structure.

关键词： Network diffusion Synchronization Brain network Magnetic resonance imaging

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Coconut waste to green nanomaterial: Large scale synthesis of N-doped graphene nano sheets

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Nano-Structures and Nano-Objects 2023年 36卷

作者： Siburian, Rikson Tang, Liang Wei Alias, Yatimah Tok, Alfred Iing Yoong Goei, Ronn Simanjuntak, Crystina Tarigan, Kerista Paiman, Suriati Goh, Boon Tong Anshori, Isa Kurniawan, Cepi Postgraduate Program Department of Chemistry Faculty of Mathematics and Natural Sciences Universitas Sumatera Utara Medan 20155 Indonesia Department of Chemistry Faculty of Mathematics and Natural Sciences Universitas Sumatera Utara Medan 20155 Indonesia Carbon and Frankincense Research Center Universitas Sumatera Utara Medan 20155 Indonesia Department of Chemistry Faculty of Science Universiti Malaya Kuala Lumpur 50603 Malaysia University Malaya Centre for Ionic Liquids (UMCiL) Universiti Malaya Kuala Lumpur 50603 Malaysia School of Materials Science and Engineering Nanyang Technological University 50 Nanyang Avenue Singapore 639798 Singapore Department of Physics Faculty of Mathematics and Natural Sciences Universitas Sumatera Utara Medan 20155 Indonesia Physics Department Faculty of Science Universiti Putra Malaysia Selangor (Serdang) Seri Kembangan 43400 Malaysia Low Dimensional Materials Research Centre Department of Physics Faculty of Science University of Malaya Kuala Lumpur 50603 Malaysia Biomedical Engineering Department School of Electrical Engineering and Informatics Bandung Institute of Technology Bandung 40132 Indonesia Research Center of Nanoscience and Nanotechnology Bandung Institute of Technology Bandung 40132 Indonesia Chemistry Department Faculty of Mathematics and Natural Sciences Universitas Negeri Semarang Semarang 50229 Indonesia Functional Material Research Center Universitas Negeri Semarang Semarang 50229 Indonesia

In this paper, a breakthrough was achieved in large-scale production of N-doped Graphene Nano Sheets (N-GNS) using coconut fruits. The main objectives were to produce N-GNS on a large scale and assess its electrical conductivity. The process involved two key steps: first, producing GNS from coconut fruits through pyrolysis, and then generating N-GNS by doping with nitrogen using ammonia solution at room temperature. Various analytical techniques were used to characterize the produced N-GNS, including X-ray Diffraction (XRD), Scanning Electron Microscopy with Energy Dispersive Spectroscopy (SEM-EDS), Transmission Electron Microscopy (TEM), X-ray Photoelectron Spectroscopy (XPS), Raman spectroscopy, and electrochemical cyclic voltammetry and electrochemical impedance spectroscopy. The XRD data indicated that the C (002) peak of N-GNS shifted to a higher 2θ value (2θ = 24.72°) compared to GNS (2θ = 23.86°), suggesting an incorporation of nitrogen into carbon structure in N-GNS. This was further supported by XPS data, which identified N-pyridine (BE = 402.0 eV) and C-N (BE = 286.8 eV) in N-GNS. TEM images showed that N-GNS had a flat surface, and the distance between graphene layers slightly expanded (0.36 nm) compared to graphene layers (0.34 nm). SEM images and EDX data validated the morphology, resembling honeycomb lattices, with a significant content of N atoms. Raman data successfully identified the D-band and G-band in N-GNS, further validating its production. Most importantly, N-GNS exhibited electrical conductivity, making it a promising candidate for conductive and supporting materials in various applications. The significance of this research extends beyond N-GNS production, opening up new avenues for the sustainable synthesis of valuable nanomaterials from coconut fruit waste, contributing to both graphene technology and environmental conservation. © 2023 Elsevier B.V.

关键词： C-sp2 Electrical conductivity Graphene nano sheets N-graphene nano sheets N-pyridine XPS

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Tensile Forces and Nanofiber Alignment Influence Both Innervated and Non-Innervated Skeletal Myofiber Formation in Custom Mechanobioreactors

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Biotechnology journal 2025年第6期20卷 e70047页

作者： Melanie C Hilman Foteini Mourkioti Suradip Das D Kacy Cullen Center for Brain Injury & Repair Department of Neurosurgery Perelman School of Medicine University of Pennsylvania Philadelphia Pennsylvania USA. Center for Neurotrauma Neurodegeneration & Restoration Corporal Michael J. Crescenz Veterans Affairs Medical Center Philadelphia Pennsylvania USA. Department of Bioengineering School of Engineering and Applied Science University of Pennsylvania Philadelphia Pennsylvania USA. Department of Orthopedic Surgery Perelman School of Medicine University of Pennsylvania Philadelphia Pennsylvania USA. Department of Cell and Developmental Biology Perelman School of Medicine University of Pennsylvania Philadelphia Pennsylvania USA. Institute for Regenerative Medicine Musculoskeletal Program Perelman School of Medicine University of Pennsylvania Philadelphia Pennsylvania USA.

While it is understood that muscle tissue generates contractile forces, it is less appreciated that muscle dynamically responds to applied forces during development. We previously fabricated tissue engineered muscle comprised of skeletal myocytes in co-culture with spinal motor neurons on aligned nanofiber poly-caprolactone scaffolding, demonstrating that innervation elicited more robust myofibers and formation of neuromuscular junctions. The current study utilized custom mechanobioreactors to apply tensile elongation to this engineered muscle platform to explore the effects of exogenous forces and scaffold topology on innervated versus non-innervated myocytes. Nanofiber scaffold alignment played a significant role in myocyte thickness, width, and fusion under both innervated and non-innervated conditions. A combination of tensile loading and nanofiber alignment increased myocyte fusion, suggesting these parameters work together to expedite and enhance myofiber formation and maturation. Overall, this multi-faceted paradigm, featuring biomechanical loading, substrate topology, and innervation, mimics key features of the developmental microenvironment experienced by myocytes in vivo. These findings may facilitate more sophisticated studies on muscle development, function, and responses to trauma while also elucidating principles to support the fabrication of engineered muscle to repair major muscle defects.

关键词： biomaterial scaffold innervation nanofibers skeletal muscle stretch growth surface topography tensile forces

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Insight into F-site enhanced interfacial H-bonding interaction and O 2 activation for selective biomass photo-upgrading to lactic acid

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Chemical engineering Journal 2025年 516卷

作者： Jie Li Yan Ding Jinshu Huang Junqi Wang Sadia Ameen Hu Li State Key Laboratory of Green Pesticide Key Laboratory of Green Pesticide & Agricultural Bioengineering Ministry of Education State-Local Joint Laboratory for Comprehensive Utilization of Biomass Center for R&D of Fine Chemicals Guizhou University Guiyang Guizhou 550025 China Department of Earth and Environmental Science School of Human Settlements and Civil Engineering Xi’an Jiaotong University Xi’an Shaanxi 710049 China Advanced Materials and Devices Laboratory Department of Bio-Convergence Science Jeonbuk National University Jeongeup Campus 56212 Republic of Korea Department of Bioactive Material Sciences Jeonbuk National University Jeonju Republic of Korea

The selectivity modulation is a challenging task for multi-step photo-reforming of biomass sugars into lactic acid (LA). Herein, a fluorine-doped ultrathin porous carbon nitride (F-CN) photocatalyst with frustrated Lewis acid-base pairs (FLPs) was developed, consisting of electron-deficient F and adjacent N as Lewis acid and base site, respectively. The introduction of FLPs not only induced F atoms to form an F–H bond with the –OH of sugar, promoting isomerization (e.g., the conversion of xylose to xylulose), but also modulated the electronic structure of g-C 3 N 4 by inhibiting exciton effect. This expedited photogenerated carrier migration and facilitated electron accumulation onto the N atoms, promoting the generation of superoxide radicals for selective C–C bond breaking (e.g., of xylulose), thus enabling the exclusive production of LA. The conversion of xylose over F-CN reached 99 %, achieving an ultrahigh LA yield of 94.8 % within 70 min at 40 °C under visible-light irradiation. Mechanistic investigations validated that the synergistic role of hydrogen bonding and the swift production of •O 2 − contributed to the greatly enhanced photocatalyst performance. Moreover, the life-cycle assessment demonstrated that an established photocatalytic system offered significant advantages compared with existing industrial LA production methods in terms of global warming potential (GWP), abiotic resource-fossil fuel (DAR), and ecotoxic potential (ETP). This study provides a paradigm of tailor-made development of non-metallic photocatalysts through regulating the electron transport path enabled by H-bond interaction for oriented conversion of biomass and complex organics.

关键词： Photocatalytic activity

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Recent advances in molecularly imprinted polymers toward biomedical healthcare devices

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Biosensors & bioelectronics 2025年 287卷 117637页

作者： Youngjun Seo Yonghwan Kim Jaeheung Kim Hyo Gi Jung Jae Won Jang Hyunji Kim Kyo Seon Hwang Dongtak Lee Sang Won Lee Jeong Hoon Lee Dae Sung Yoon School of Biomedical Engineering Korea University Seoul 02841 Republic of Korea Interdisciplinary Program in Precision Public Health Korea University Seoul 02841 Republic of Korea. Department of Clinical Pharmacology and Therapeutics College of Medicine Kyung Hee University Seoul 02447 Republic of Korea. Department of Bioengineering & Nano-bioengineering Research Center for Bio Materials and Process Development Incheon National University Incheon 22012 Republic of Korea Division of Bioengineering Incheon National University Incheon 22012 Republic of Korea. Terasaki Institute for Biomedical Innovation Los Angeles CA 90064 USA. Electronic address: skylsw5@korea.ac.kr. KU-KIST Graduate School of Converging Science and Technology Korea University Seoul 02841 Republic of Korea Department of Integrative Energy Engineering College of Engineering Korea University Seoul 02841 Republic of Korea. Electronic address: hellojhlee@korea.ac.kr. Interdisciplinary Program in Precision Public Health Korea University Seoul 02841 Republic of Korea Astrion Inc Seoul 02841 Republic of Korea. Electronic address: dsyoon@korea.ac.kr.

Following the increase in the global aging population, the importance of monitoring various disease-related biomarkers at an early stage has increased to ensure the health of the elderly. In an aging society, point-of-care (POC) systems are needed to care for elderly people who have physical and mental disorders. In light of the increasing prominence of POC systems, there is a growing effort to address the limitations associated with conventional receptors in wearable devices by substituting them with molecularly imprinted polymer (MIP). MIPs are well-known synthetic receptors engineered with specific binding cavities based on the "lock and key" principle. They could be synthesized in various configurations depending on specific types of monomers and templates. Compared to conventional receptors such as antibodies and aptamers, MIPs exhibit outstanding advantages, including good stability, cost-effectiveness, ease of synthesis, reusability, and broad applicability. These advantages have led to their extensive application in biomedical healthcare devices. This review summarizes a comparative analysis of sensors utilized for the detection of disease-specific biomarkers through diverse MIP applications and methodologies. Furthermore, we evaluated recent advancements in the miniaturization of MIPs and their integration with wearable biomedical devices for comprehensive healthcare monitoring applications. Finally, we delineated the existing limitations that need to be surmounted for the effective implementation of MIP-based biomedical devices and outlined future objectives for the enhancement of wearable and wireless biomedical healthcare monitoring devices.

关键词： Biomarker Healthcare monitoring Molecularly imprinted polymer Point-of-care Wearable biomedical devices

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A photoacoustic patch for three-dimensional imaging of hemoglobin and core temperature

Research Square

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Research Square 2021年

作者： Gao, Xiaoxiang Chen, Xiangjun Hu, Hongjie Wang, Xinyu Mu, Jing Lou, Zhiyuan Zhang, Ruiqi Shi, Keren Yue, Wentong Chen, Xue Lin, Muyang Qi, Baiyan Zhou, Sai Lu, Chengchangfeng Gu, Yue Ding, Hong Zhu, Yangzhi Huang, Hao Ma, Yuxiang Li, Mohan Mishra, Aditya Xu, Sheng Department of Nanoengineering University of California San Diego La Jolla CA92093 United States Materials Science and Engineering Program University of California San Diego La Jolla CA92093 United States Department of Electrical and Computer Engineering University of California San Diego La Jolla CA United States Department of Radiology School of Medicine University of California San Diego La Jolla CA92093 United States Department of Bioengineering University of California San Diego La Jolla CA92093 United States

Electronic patches, based on various mechanisms, allow continuous and noninvasive monitoring of biomolecules on the skin surface. However, to date, such devices have been unable to sense biomolecules in deep tissues, which have a stronger and faster correlation with the human physiological status. Here, we demonstrate a photoacoustic patch for three-dimensional (3D) mapping of hemoglobin in deep tissues. This photoacoustic patch integrates an array of ultrasonic transducers and vertical-cavity surface-emitting laser (VCSEL) diodes on a common soft substrate. The high-power VCSEL diodes can generate laser pulses that penetrate >2 cm into human tissues and activate hemoglobin molecules to generate acoustic waves, which can be collected by the transducers for 3D imaging of the hemoglobin with a sub-millimeter spatial resolution. Additionally, the photoacoustic signal amplitude and temperature have a linear relationship, which allows 3D mapping of core temperatures with high accuracy and fast response. The results of 3D core temperature mapping and long-term monitoring in ex-vivo and in-vivo studies are validated by commercial devices. With access to biomolecules in deep tissues, this technology adds unprecedented functions to wearable electronics and thus holds significant implications for various applications in both basic research and clinical practice. © 2021, CC BY.

关键词： Mapping

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The Impact of Supersaturated Electrode on Heterogeneous Lithium Nucleation and Growth Dynamics

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Angewandte Chemie 2024年第48期136卷

作者： Jimin Park Ji In Jung Son Ha Do Hyun Kim Hyun-Seok Jang Prof. Byung Hoon Kim Prof. Hyung-Kyu Lim Prof. Hyoung-Joon Jin Prof. Young Soo Yun KU-KIST Graduate School of Converging Science and Technology Korea University 145 Anam-ro Seongbuk-gu 02841 Seoul Republic of Korea Program in Environmental and Polymer Engineering Inha University 100 Inha-ro Michuhol-gu 22212 Incheon Republic of Korea Department of Physics Incheon National University 22012 Incheon Republic of Korea Division of Chemical Engineering and Bioengineering Kangwon National University 24341 Chunchenon Gangwon-do South Korea Department of Polymer Science and Engineering Inha University 100 Inha-ro Michuhol-gu 22212 Incheon Republic of Korea Department of Integrative Energy Engineering Korea University 145 Anam-ro Seongbuk-gu 02841 Seoul Republic of Korea

The concept of a lithiophilic electrode proves inadequate in describing carbon-based electrode materials due to their substantial mismatch in surface energy with lithium metal. However, their notable capacity for lithium chemisorption can increase active lithium concentration required for nucleation and growth, thereby enhancing the electrochemical performance of lithium metal anodes (LMAs). In this study, we elucidate the effects of the supersaturated electrode which has high active lithium capacity around equilibrium lithium potential on LMAs through an in-depth electrochemical comparison using two distinct carbon electrode platforms with differing carbon structures but similar two-dimensional morphologies. In the supersaturated electrode, both the dynamics and thermodynamic states involved in lithium nucleation and growth mechanisms are significantly improved, particularly under continuous current supply conditions. Furthermore, the chemical structures of the solid-electrolyte-interface layers (SEIs) are greatly influenced by the elevated surface lithium concentration environment, resulting in the formation of more conductive lithium-rich SEI layers. The improved dynamics and thermodynamics of surface lithium, coupled with the formation of enhanced SEI layers, contribute to higher power capabilities, enhanced Coulombic efficiencies, and improved cycling performances of LMAs. These results provide new insight into understanding the enhancements in heterogeneous lithium nucleation and growth kinetics on the supersaturated electrode.

关键词： supersaturated electrode lithiophilic electrode carbon electrode lithium metal anode lithium nucleation and growth

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Terahertz Cavity Phonon Polaritons in Lead Telluride in the Deep-Strong Coupling Regime

arXiv

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arXiv 2025年

作者： Baydin, Andrey Manjappa, Manukumara Mishra, Sobhan Subhra Xu, Hongjing Doumani, Jacques Tay, Fuyang Kim, Dasom Rappl, Paulo H.O. Abramof, Eduardo Singh, Ranjan Hernandez, Felix G.G. Kono, Junichiro Department of Electrical and Computer Engineering Rice University HoustonTX77005 United States Smalley–Curl Institute Rice University HoustonTX77005 United States Rice Advanced Materials Institute Rice University HoustonTX77005 United States Instrumentation and Applied Physics Department Indian Institute of Science Bangalore560012 India Center for Disruptive Photonic Technologies The Photonics Institute Nanyang Technological University 639798 Singapore Department of Physics and Astronomy Rice University HoustonTX77005 United States Applied Physics Graduate Program Smalley–Curl Institute Rice University HoustonTX77005 United States Group of Research and Development in Materials and Plasma National Institute for Space Research São José dos Campos São Paulo12201-970 Brazil Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University 637371 Singapore Instituto de Física Universidade de São Paulo São Paulo05508-090 Brazil Department of Material Science and NanoEngineering Rice University HoustonTX77005 United States

Lead telluride is an important thermoelectric material due to its large Seebeck coefficient combined with its unusually low thermal conductivity that is related to the strong anharmonicity of phonons in this material. Here, we have studied the resonant and nonperturbative coupling of transverse optical phonons in lead telluride with cavity photons inside small-mode-volume metallic metasurface cavities that have photonic modes with terahertz frequencies. We observed a giant vacuum Rabi splitting on the order of the bare phonon and cavity frequencies. Through terahertz time-domain spectroscopy experiments, we systematically studied the vacuum Rabi splitting as a function of sample thickness, temperature, and cavity length. Under the strongest light–matter coupling conditions, the strength of coupling exceeded the bare phonon and cavity frequencies, putting the system into the deep-strong coupling regime. These results demonstrate that this uniquely tunable platform is promising for realizing and understanding predicted cavity-vacuum-induced ferroelectric instabilities and exploring applications of light–matter coupling in the ultrastrong and deep-strong coupling regimes in quantum technology. Copyright © 2025, The Authors. All rights reserved.

关键词： Phonons

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In-situ electron microscopy study of non-volatile resistive switching in Mott insulator VO2

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Microscopy and Microanalysis 2021年第S1期27卷 2162-2164页

作者： Shaobo Cheng Min-Han Lee Xing Li Lorenzo Fratino Marcelo Rozenberg Ivan Schuller Yimei Zhu Department of Condensed Matter Physics and Materials Science Brookhaven National Laboratory Upton NY USA upton New York United States University of California-San Diego United States Key Laboratory of Material Physics School of Physics and Microelectronics Zhengzhou University Zhengzhou Henan P. R. China United States Laboratoire de Physique des Solides CNRS Université Paris-Sud Université Paris-Saclay Orsay France United States Materials Science and Engineering Program University of California-San Diego La Jolla CA USA United States Department of Condensed Matter Physics and Materials Science Brookhaven National Laboratory Upton NY USA United States

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