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The Study of Crystallization Kinetics and chemical Changes in Ge4Sb4Te5through Transmission Electron Microscope

Microscopy and Microanalysis 2024年第SUPPLEMENT_1期30卷

作者： Singh, Manish Kumar Ghosh, Chanchal Watt, John Barry Carter, C Silva, Helena Department of Physics University of Allahabad Prayagraj Uttar Pradesh India Department of Materials Science and Engineering University of Connecticut Storrs Connecticut United States Los Alamos National Laboratory Los Alamos New Mexico United States Center for Integrated Nanotechnologies (CINT) Sandia National Laboratories Albuquerque New Mexico United States Chemical & Biomolecular Engineering University of Connecticut Storrs Connecticut United States Department of Electrical and Computer Engineering University of Connecticut Storrs Connecticut United States

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Cover Picture: Cyclotetrabenzil Derivatives for Electrochemical Lithium-Ion Storage (Angew. Chem. Int. Ed. 29/2023)

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Angewandte Chemie International Edition 2023年第29期62卷

作者： Jianing Meng Dr. Alexandra Robles Dr. Said Jalife Wen Ren Ye Zhang Dr. Lihong Zhao Dr. Yanliang Liang Prof. Dr. Judy I. Wu Prof. Dr. Ognjen Š. Miljanić Prof. Dr. Yan Yao Department of Chemistry University of Houston 3585 Cullen Blvd. Houston TX-77204-5003 USA Department of Chemical and Biomolecular Engineering University of Houston Houston TX-77204-4004 USA Department of Electrical and Computer Engineering and Materials Science and Engineering Program University of Houston Houston TX-77204 USA Texas Center for Superconductivity at the University of Houston University of Houston Houston TX-77204 USA

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Cyclotetrabenzil Derivatives for Electrochemical Lithium-Ion Storage

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Angewandte Chemie 2023年第29期135卷

Organic electrode materials could revolutionize batteries because of their high energy densities, the use of Earth-abundant elements, and structural diversity which allows fine-tuning of electrochemical properties. However, small organic molecules and intermediates formed during their redox cycling in lithium-ion batteries (LIBs) have high solubility in organic electrolytes, leading to rapid decay of cycling performance. We report the use of three cyclotetrabenzil octaketone macrocycles as cathode materials for LIBs. The rigid and insoluble naphthalene-based cyclotetrabenzil reversibly accepts eight electrons in a two-step process with a specific capacity of 279 mAh g −1 and a stable cycling performance with ≈65 % capacity retention after 135 cycles. DFT calculations indicate that its reduction increases both ring strain and ring rigidity, as demonstrated by computed high distortion energies, repulsive regions in NCI plots, and close [C⋅⋅⋅C] contacts between the naphthalenes. This work highlights the importance of shape-persistency and ring strain in the design of redox-active macrocycles that maintain very low solubility in various redox states.

关键词： Cyclotetrabenzil Lithium-Ion Batteries Macrocycles Multielectron Transfer Ring Strain

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Titelbild: Cyclotetrabenzil Derivatives for Electrochemical Lithium-Ion Storage (Angew. Chem. 29/2023)

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Angewandte Chemie 2023年第29期135卷

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Cavity-mediated superthermal phonon correlations in the ultrastrong coupling regime

arXiv

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arXiv 2024年

作者： Kim, Dasom Hou, Jin Lee, Geon Agrawal, Ayush Kim, Sunghwan Zhang, Hao Bao, Di Baydin, Andrey Wu, Wenjing Tay, Fuyang Huang, Shengxi Chia, Elbert E.M. Kim, Dai-Sik Seo, Minah Mohite, Aditya D. Hagenmüller, David Kono, Junichiro Applied Physics Graduate Program Smalley–Curl Institute Rice University HoustonTX77005 United States Department of Electrical and Computer Engineering Rice University HoustonTX77005 United States Department of Materials Science and NanoEngineering Rice University HoustonTX77005 United States Sensor System Research Center Korea Institute of Science and Technology Seoul02792 Korea Republic of Department of Physics and Astronomy Seoul National University Seoul08826 Korea Republic of Department of Chemical and Biomolecular Engineering Rice University Houston77005 United States Ulsan44919 Korea Republic of Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Singapore637371 Singapore Smalley–Curl Institute Rice University HoustonTX77005 United States Rice Advanced Materials Institute Rice University HoustonTX77005 United States KU–KIST Graduate School of Converging Science and Technology Korea University Seoul02841 Korea Republic of Université de Strasbourg CNRS Strasbourg67200 France Department of Physics and Astronomy Rice University HoustonTX77005 United States

Phonons, or vibrational quanta, are behind some of the most fundamental physical phenomena in solids, including superconductivity, Raman processes, and broken-symmetry phases. It is therefore of fundamental importance to find ways to harness phonons for controlling these phenomena and developing novel quantum technologies. However, the majority of current phonon control techniques rely on the use of intense external driving fields or strong anharmonicities, which restricts their range of applications. Here, we present a scheme for controlling the intensity fluctuations in phonon emission at room temperature based on multimode ultrastrong light–matter coupling. The multimode ultrastrong coupling regime is achieved by coupling two optical phonon modes in lead halide perovskites to an array of nanoslots, which operates as a single-mode cavity. The extremely small mode volume of the nanoslots enables unprecedented coupling strengths in a cavity phonon-polariton system. In the far-detuned, low-cavity-frequency regime, we demonstrate that the nanoslot resonator mediates an effective coupling between the phonon modes, resulting in superthermal phonon bunching in thermal equilibrium, both within the same mode and between different modes. Experimental results are in good agreement with a multimode Hopfield model. Our work paves the way for the tailoring of phonons to modify charge and energy transport in perovskite materials, with potential applications in light-collecting or emitting devices. Copyright © 2024, The Authors. All rights reserved.

关键词： Perovskite

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IEC-Independent Coupling Between Water Uptake and Ionic Conductivity in Anion-Conducting Polymer Films

arXiv

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arXiv 2025年

作者： Montes de Oca, Joan M. Dong, Ruilin Zaldivar, Gervasio Sun, Ge Wang, Zhongyang Patel, Shrayesh N. Nealey, Paul F. de Pablo, Juan J. Pritzker School of Molecular Engineering University of Chicago ChicagoIL60637 United States Energy Frontier Research Center Argonne National Laboratory LemontIL60439 United States Department of Chemical and Biomolecular Engineering Tandon School of Engineering New York University BrooklynNY United States Department of Computer Science Courant Institute of Mathematical Sciences New York University New YorkNY United States Department of Physics New York University New YorkNY United States Department of Chemical & Biological Engineering The University of Alabama TuscaloosaAL35487-0203 United States Materials Science Division Argonne National Laboratory LemontIL60439 United States

Anion exchange membranes (AEMs) are promising candidates for replacing proton exchange membranes (PEMs) in electrochemical devices such as fuel cells, electrolyzers, batteries, and osmotic energy extraction systems. However, optimizing the AEM design requires a deeper understanding of the ionic conduction mechanism in the hydrated polymer matrix. This study investigates this mechanism by seeking to understand the relationship between ion exchange capacity (IEC), water absorption, and ionic conductivity in polynorbornene-based thin films. We combine experimental measurements with computational simulations using a newly developed minimal model of the polymer film. Our model is able to reproduce key experimental observations, including water sorption isotherms and ion conduction behavior as a function of relative humidity, and successfully captures the relationship between them. By comparing experimental data with computational results, we explain the commonly reported correlation between conductivity and hydration level and show how the correlation between these variables is affected by the charge density and temperature of the material. Our research advances our understanding of the physical mechanisms that govern the performance of the polyelectrolyte membrane, which is essential for the development of more efficient, stable, and environmentally friendly electrochemical systems. Copyright © 2025, The Authors. All rights reserved.

关键词： Water absorption

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Search for temporal cell segmentation robustness in phase-contrast microscopy videos

arXiv

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arXiv 2021年

作者： Gómez-De-Mariscal, Estibaliz Jayatilaka, Hasini Çiçek, Özgün Brox, Thomas Wirtz, Denis Muñoz-Barrutia, Arrate Bioengineering and Aerospace Engineering Department Universidad Carlos Iii de Madrid Instituto de Investigación Sanitaria Gregorio Marañón Madrid Spain AtlasXomics Inc. New Haven United States Department of Computer Science Albert-Ludwigs-University Freiburg Germany Department of Chemical and Biomolecular Engineering Institute for Nanobiotechnology The Johns Hopkins University United States Department of Oncology The Johns Hopkins University School of Medicine Baltimore United States

Studying cell morphology changes in time is critical to understanding cell migration mechanisms. In this work, we present a deep learning-based workflow to segment cancer cells embedded in 3D collagen matrices and imaged with phase-contrast microscopy. Our approach uses transfer learning and recurrent convolutional long-short term memory units to exploit the temporal information from the past and provide a consistent segmentation result. Lastly, we propose a geometrical-characterization approach to studying cancer cell morphology. Our approach provides stable results in time, and it is robust to the different weight initialization or training data sampling. We introduce a new annotated dataset for 2D cell segmentation and tracking, and an open-source implementation to replicate the experiments or adapt them to new image processing problems. © 2021, CC BY-NC-ND.

关键词： Image segmentation

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Control Lyapunov-Barrier Function-Based Economic Model Predictive Control of Nonlinear Systems⁎

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IFAC-PapersOnLine 2018年第20期51卷 48-53页

作者： Wu, Zhe Durand, Helen Christofides, Panagiotis D. Department of Chemical and Biomolecular Engineering University of California Los AngelesCA90095-1592 United States Department of Chemical Engineering and Materials Science Wayne State University DetroitMI48202 United States Department of Chemical and Biomolecular Engineering and Department of Electrical and Computer Engineering University of California Los AngelesCA90095-1592 United States

This work focuses on the design of a new class of economic model predictive control (EMPC) systems for nonlinear process systems that address simultaneously the tasks of economic optimality, safety and closed-loop stability. This is accomplished by incorporating in the EMPC an economics-based cost function and Control Lyapunov-Barrier Function (CLBF)-based constraints that ensure that the closed-loop state does not enter unsafe sets and remains within a well-characterized set in the system state-space. The new class of CLBF-EMPC systems is demonstrated using a nonlinear chemical process example. © 2018

关键词： Closed loop control systems Cost functions Economics Model predictive control Nonlinear systems Barrier functions chemical process Closed loop stability Closed loops Economic modeling Nonlinear process Operational safety System state

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Handling Process Safety and Stochastic Uncertainty in Economic Model Predictive Control⁎

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IFAC-PapersOnLine 2018年第20期51卷 424-429页

Process operational safety plays an important role in designing control systems for chemical processes. Motivated by this, in this work, we develop a process Safeness Index-based economic model predictive control system for a broad class of stochastic nonlinear systems with input constraints. A stochastic Lyapunov-based controller is first utilized to characterize a region of the state-space surrounding the origin starting from which the origin is rendered asymptotically stable in probability. Using this stability region characterization and a process Safeness Index function which characterizes the region in state-space in which it is safe to operate the process, an economic model predictive control system is then developed using Lyapunov-based constraints to ensure economic optimality, process operational safety and closed-loop stability in probability. A chemical process example is used to demonstrate the applicability and effectiveness of the proposed approach. © 2018

关键词： Model predictive control Nonlinear systems Predictive control systems Stochastic control systems Stochastic models Stochastic systems chemical process Economic modeling Operational safety Probabilistic uncertainty Safeness Index

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Corrigendum to: “Multi-interface engineering of solar evaporation devices via scalable, synchronous thermal shrinkage and foaming” [Nano Energy 74 (2020) 104875]

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Nano Energy 2021年 82卷

作者： Kerui Li Minmin Gao Zhipeng Li Haitao Yang Lin Jing Xi Tian Yang Li Shuo Li He Li Qing Wang John S. Ho Ghim Wei Ho Po-Yen Chen Department of Chemical and Biomolecular Engineering National University of Singapore 117585 Singapore Department of Electrical and Computer Engineering National University of Singapore 117583 Singapore Department of Materials Science and Engineering National University of Singapore 117576 Singapore

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