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2023 Conference on Lasers and Electro-Optics, CLEO 2023

作者： Xu, Rui Lin, Tong Luo, Jiaming Chen, Xiaotong Blackert, Elizabeth R. Moon, Alyssa R. JeBailey, Khalil M. Zhu, Hanyu Department of Materials Science and Nano Engineering Rice University Houston United States Applied Physics Graduate Program Rice University Houston United States Program Rice University Houston United States

ISBN: (纸本)9781957171258

We report the experimental demonstration of surface phonon-polaritonic devices in a broad spectral range of 7-13 THz based on SrTiO3. We designed planar ultrafast concentrators that amplifies transient electric field by 6 times and measured an average field of 0.5 GV/m in an optically resolvable area in the far field. © 2023 The Author(s)

关键词： Perovskite

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Conductive Mof Coating for Suppressing the Mn Dissolution in Limn2o4 Toward Long-Life Lithium-Ion Batteries

SSRN

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SSRN 2024年

作者： Kim, Eunji Lee, Jeongmin Park, Junghyun Nam, Kwan Woo Department of Chemical Engineering and Materials Science Graduate Program in System Health Science and Engineering Ewha Womans University Seoul03760 Korea Republic of

Spinel lithium manganese oxide (LiMn2O4, denoted LMO) is one of the promising cathode materials with non-toxicity, high operating voltage, and low cost. However, structural collapse during battery cycling — caused by Mn dissolution and the Jahn-Teller effect — is a critical disadvantage, reducing cycle retention, particularly at high temperatures. In this investigation, to solve these critical issues of LMO cathode, we introduce Cu3(HITP)2, a conductive two-dimensional (2D) MOF as a surface coating material through a simple process. Coating the conductive 2D Cu3(HITP)2 MOF increases the electrical conductivity and shows the effect of suppressing the dissolution of Mn by enriching the surface of LMO with Mn4+. By suppressing Mn dissolution, structural stability also improves, resulting in offsetting all the inherent problems of LMO. As a result, at 50 °C, CuHITP–LMO exhibits an initial capacity of 98.7 mAh g–1 at 100 mA g–1 and achieved a capacity of 74.5 mAh g–1 after 100 cycles, indicating outstanding cyclability. This research highlights the potential of conductive 2D MOF to improve the electrochemical performances of battery cathode. © 2024, The Authors. All rights reserved.

关键词： Cathodes

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Highly stable hybrid single-micelle:A universal nanocarrier for hydrophobic bioimaging agents

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Nano Research 2022年第5期15卷 4582-4589页

作者： Qiaoyu Zhou Tiancong Zhao Mengli Liu Dongrui Yin Minchao Liu Ahmed AElzatahry Fan Zhang Dongyuan Zhao Xiaomin Li Department of Chemistry State Key Laboratory of Molecular Engineering of PolymersiChemShanghai Key Laboratory of Molecular Catalysis and Innovative MaterialsFudan UniversityShanghai 200433China Materials Science and Technology Program College of Arts and SciencesQatar UniversityPO Box 2713DohaQatar

As the first-line technology,micelles play a pivotal role in in vivo delivery of theranostic agents because of their high biocompatibility and ***,in complex physiological environments(extreme dilution,pH,and oxidation or reduction,etc.),they generally suffer from structural instability and insufficient protection for encapsulated *** is urgent to reinforce the structural stability of the micelles at the single-micelle *** using the FDA-approved Pluronic F127 surfactants and indocyanine green(ICG)bioimaging agents as model,herein,we propose the silane-crosslinking assisted strategy to reinforce the structural stability of the *** from the traditional silane hydrolysis under the harsh experimental conditions(acidic,alkaline,and high temperature hydrothermal,etc.),the ICG loaded F127@SiO_(2) hybrid single-micelles(ICG@H-micelles)with controllable sizes(15-35 nm)are synthesized at neutral pH and room temperature,which is crucial for the maintenance of the physicochemical properties of the encapsulated *** the ultra-thin SiO_(2)(<5 nm)at hydrophilic layer of the single-micelle,the structural and fluorescence stability of ICG@H-micelles are much higher than the conventional micelle(ICG@micelles)in the simulated physiological environments of dilution,oxidation or reduction,and low *** of the high structural and fluorescence stability,the ICG@H-micelles also exhibit longer duration time in the tumor and gastrointestinal tract bioimaging.

关键词： micelle SiO_(2) inorganic-organic hybrid mesoporous material bioimaging

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Design and fabrication of universal resolution targets for microsphere-assisted microscopy 31

Design and fabrication of universal resolution targets for m...

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Three-Dimensional and Multidimensional Microscopy: Image Acquisition and Processing XXXI 2024

作者： Abbasian, Vahid Awan, Kashif Masud Darafsheh, Arash Department of Radiation Oncology Washington University School of Medicine in St. Louis St. LouisMO63110 United States Imaging Science Program McKelvey School of Engineering Washington University in St. Louis St. LouisMO63130 United States Institute of Materials Science and Engineering Washington University St. LouisMO63130 United States Department of Mechanical Engineering and Materials Science Washington University in St. Louis St. LouisMO63130 United States

ISBN: (纸本)9781510669550

Determining the achieved spatial resolution in microsphere-assisted microscopy (MAM) has remained an important and challenging task. While fluorescent-based microscopies use fluorescent nano-beads to determine the point spread function (PSF), such a method is not practical in label-free super-resolution techniques. In some previous studies, objects with certain features have been imaged and those feature sizes have been reported as the resolution;however, determining the resolution in that way is not consistent with the definition of resolution based on point sources. Furthermore, the imaging characteristics in MAM may depend on specimen-specific properties, such as materials and substrate. In this study, we propose a robust and objective technique to address these issues. We fabricate arrays of nano-pillars varying in diameter and periodicity, ranging from 50 to 1000 nm. These pillars consist of a 20 nm Ag layer with a 2 nm Cr adhesion layer, deposited on a silicon substrate. The role of specimen-specific properties can be investigated by considering different materials. Fabrication involves the bilayer PMMA resist lift-off process, ensuring accurate deposition of nanometer-scale features to serve as sub-diffraction-limited targets in optical super-resolution microscopy. A deconvolution method that provides a robust platform for resolution measurement was used. By deconvolving the object profile, obtained from scanning electron microscopy, from the image profile, the PSF of the system is determined. Our proposed technique offers a reliable and standardized approach for quantifying resolution, magnification, and field-of-view in MAM or any other label-free microscopy technique, enabling accurate and objective comparison across different novel microscopy techniques. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

关键词： Microspheres

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Liquid-Feed Flame Spray Pyrolysis Enabled Synthesis of Li(Tm)Po4 (Tm=Fe, Mn, Ni) Nanopowders Via Metallo-Organic Precursors as Li-Ion Cathodes

SSRN

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SSRN 2024年

作者： Brandt, Taylor G. Tuokkola, Andrew R. Yu, Mengjie Kim, Phil Yong Laine, Richard M. Department of Materials Science and Engineering University of Michigan Ann ArborMI48109 United States Macromolecular Science and Engineering University of Michigan Ann ArborMI48109 United States

A major driving force in both industry and academia mandates improving battery materials based both on performance and/or cost. Therefore, the use of abundant, inexpensive elements such as Fe and Mn, in lieu of Co and/or Ni, in high-throughput syntheses can maximize cost savings for cathodes and, subsequently, energy storage. To this end, we examine the electrochemical performance of LFP, a well-studied cathode material, and LFP-type materials synthesized using an alternative, scalable method – using metal carboxylate precursors via liquid feed-flame spray pyrolysis (LF-FSP). Herein, we report the synthesis and characterization of four LiTMPO4 (TM = Fe, Mn, and/or Ni) NPs with varying degrees of Fe substitution: LiFePO4, LiMn1/3Fe2/3PO4, LiMn2/3Fe1/3PO4, and LiNi1/3Mn1/3Fe1/3PO4. All materials were characterized as to morphological, structural, and spectroscopic techniques revealing successful synthesis of target materials. All synthesized materials showed the target olivine phase Pnma via XRD with APS 100 nm via PSA. The as-produced materials are primarily amorphous per XRD and FTIR;however, the target crystalline phase is obtained after calcination at 700°C. Electrochemical studies including CV and GCPL demonstrate typical capacity and retention over a range of C-rates from 0.1 to 1.0C. An increase in practical energy density was obtained with 1/3 Mn substitution (LiMn1/3Fe2/3PO4) compared to LFP (491±9 vs 464±3 Wh kg-1 at 1.0C), while maintaining excellent capacity retention after 100 cycles (~96%). © 2024, The Authors. All rights reserved.

关键词： Cathodes

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Density Functional Theory Study of Surface Stability and Phase Diagram of Orthorhombic CsPbI3

arXiv

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arXiv 2024年

作者： Li, Kejia Wang, Mengen Department of Electrical and Computer Engineering and Materials Science and Engineering Program SUNY BinghamtonNY13902 United States

CsPbI3 has been recognized as a promising candidate for optoelectronic device applications. To further improve the efficiency of the devices, it is imperative to better understand the surface properties of CsPbI3, which affect charge carrier transport and defect formation properties. In this study, we perform density functional theory calculations to explore the stability of the (001), (110), and (100) surfaces of orthorhombic CsPbI3, considering different stoichiometries and surface reconstructions. Our results show that, under the chemical potentials confined by the thermodynamically stable region of bulk CsPbI3, the CsI-terminated surfaces of (001) and (110) and the stoichiometric surface of (100) are stable. Among these three surfaces, the CsI-terminated (110) surface has the lowest surface energy and no mid-gap states, which benefits the transport properties of the material. © 2024, CC BY-NC-SA.

关键词： Stoichiometry

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Edge atomic Fe sites decorated porous graphitic carbon as an efficient bifunctional oxygen catalyst for Zinc-air batteries

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Journal of Energy Chemistry 2023年第8期83卷 602-611,I0014页

作者： Ruihui Gan Yali Wang Xiangwu Zhang Yan Song Jingli Shi Chang Ma Tianjin Municipal Key Lab of Advanced Fiber and Energy Storage Technology Tiangong UniversityTianjin 300387China Fiber and Polymer Science Program Department of Textile EngineeringChemistry and ScienceWilson College of TextilesNorth Carolina State UniversityRaleighNC 27695-8301uNITED sTATES CAS Key Laboratory of Carbon Materials Institute of Coal ChemistryChinese Academy of SciencesTaiyuan 030001ShanxiChina

The development of advanced bifunctional oxygen electrocatalysts for oxygen reduction and evolution reactions(ORR and OER) is critical to the practical application of zinc-air batteries(ZABs). Herein, a silica-assisted method is reported to integrate numerous accessible edge Fe-Nx sites into porous graphitic carbon(named Fe-N-G) for achieving highly active and robust oxygen electrocatalysis. Silica facilitates the formation of edge Fe-Nx sites and dense graphitic domains in carbon by inhibiting iron *** purification process creates a well-developed mass transfer channel for Fe-N-G. Consequently,Fe-N-G delivers a half-wave potential of 0.859 V in ORR and an overpotential of 344 m V at10 m A cm^(-2)in OER. During long-term operation, the graphitic layers protect edge Fe-Nx sites from demetallation in ORR and synergize with Fe OOH species endowing Fe-N-G with enhanced OER *** functional theory calculations reveal that the edge Fe-Nx site is superior to the in-plane Fe-Nx site in terms of OH* dissociation in ORR and OOH* formation in OER. The constructed ZAB based on Fe-N-G cathode shows a higher peak power density of 133 m W cm^(-2)and more stable cycling performance than Pt/C + RuO2counterparts. This work provides a novel strategy to obtain high-efficiency bifunctional oxygen electrocatalysts through space mediation.

关键词： Bifunctionality EdgeFe-Nxsites Oxygen catalysis Graphitic domains Zinc-air batteries

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Corrosion behavior of Mg-Zn-Zr-RE alloys under physiological environment-Impact on mechanical integrity and biocompatibility

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Journal of Magnesium and Alloys 2022年第6期10卷 1542-1572页

作者： Marwa AbdelGawad Chaudhry A.Usman Vasanth C.Shunmugasamy Ibrahim Karaman Bilal Mansoor Mechanical Engineering Program Texas A&M University at QatarEducation CityDoh1Qatar Department of Mechanical Engineering Texas A&M University3123 TAMUCollege StationTX 77843United States of America Department of Materials Science and Engineering Texas A&M University3003 TAMUCollege StationTX 77843United States of America

Benefits of RE addition on Mg alloys strength and corrosion resistance are widely reported but their effects on biodegradability and biocompatibility are still of *** paper investigates the effect of RE additions on biodegradability of Mg-Zn alloys under simulated physiological *** this context,two commercial Mg-Zn-Zr-RE alloys,namely ZE41 and EZ33,with same RE addition but different concentrations are studied in Hank’s Balanced Salt Solution(HBSS)at 37℃and with pH of ***-loss,hydrogen evolution,real-time insitu drop test,electrochemical impedance spectroscopy(EIS)and potentiodynamic polarization are deployed to study corrosion *** mechanical integrity of both alloys is assessed by mechanical testing post ***,in vitro biocompatibility is evaluated by indirect cytotoxicity tests using NIH3T3 *** reveal that although both alloys showed similar microstructure,size and distribution of precipitates played a significant role on its corrosion *** and open circuit potential results show stable film formation on EZ33,while ZE41 showed passive layer formation followed by its deterioration,over the analyzed time *** real-time drop test,it was shown in ZE41 alloy that both T-phase and Zr-rich precipitates acted as micro cathodes,resulting in an unstable surface *** EZ33,Zr-rich regions did not influence corrosion response,resulting in better corrosion resistance that was corroborated by post-immersion surface morphology *** higher degradation observed in ZE41 alloy resulted in higher drop in flexural and tensile strength compared to EZ33 *** addition,cytotoxicity tests on NIH3T3 cells revealed that cell viability of EZ33 increased with increasing incubation time,contrary to ZE41,owing to its lower biodegradation behavior and despite higher concentrations of *** results show that an increase in RE concentration in EZ33,relative to ZE41,had a positive effect on

关键词： Magnesium alloy Corrosion EIS Mechanical integrity Cytotoxicity

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A Review on Application of Poly(3,4-ethylenedioxythiophene) (PEDOT) in Rechargeable Batteries

Organic Materials

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Organic materials 2022年第4期4卷 292-300页

作者： Su, Laisuo Kumar, Shwetha Sunil Manthiram, Arumugam Reeja-Jayan, B. Materials Science and Engineering Program Texas Materials Institute The University of Texas at Austin Austin 78712 TX United States Department of Mechanical Engineering Carnegie Mellon University Pittsburgh 15213 PA United States

Since the very first patent on poly(3,4-ethylenedioxythiophene) (PEDOT) that was filed in 1988, this polymer has been widely utilized and has achieved great success owing to its high electrical conductivity and excellent stability. The application of the conducting polymer, PEDOT, in renewable energy devices, especially rechargeable batteries, is attracting increasing attention due to its potential to solve the energy and climate crisis. In this review, we summarize the research over the past few decades directed toward the application of PEDOT in rechargeable batteries aimed at improving their electrochemical performance. We focus on PEDOT synthesized via oxidative chemical vapor deposition (oCVD), a relatively new process known for its ability to grow conducting polymer thin films with uniform, pinhole-free properties, and controllable thickness and conformality. For a comparison purpose, PEDOT synthesized via solution-based methods is also briefly summarized. Finally, future research directions for applying oCVD PEDOT in rechargeable batteries are discussed. Introduction PEDOT Synthesis Methods Application of oCVD PEDOT in Rechargeable Batteries Applications of Solution-Based PEDOT in Rechargeable Batteries Conclusions and Outlook. © 2022. The Author(s).

关键词： batteries coating oxidative chemical vapor deposition (oCVD) polyethylene dioxythiophene (PEDOT)

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Temperature-Responsive and Passive Wireless Mechanical Metamaterial Sensors 14

Temperature-Responsive and Passive Wireless Mechanical Metam...

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14th International Workshop on Structural Health Monitoring: Designing SHM for Sustainability, Maintainability, and Reliability, IWSHM 2023

作者： Naidu, Vishnu R. Park, Yujin Loh, Kenneth J. Materials Science and Engineering Program University of California La Jolla San DiegoCA92093 United States Department of Structural Engineering University of California La Jolla San DiegoCA92093 United States

ISBN: (纸本)9781605956930

Knowing the location and environmental conditions of sailors that have fallen overboard can greatly facilitate open water search and rescue operations. Currently, active sensors that trigger an alarm when a sailor falls overboard exist, and it works by detecting a loss of signal from a transmitter. However, their applications have been limited because of the dependence on a working battery, as well as the fact that sailor location cannot be tracked beyond the one-time loss-of-signal event. In this study, a passive, person-overboard sensing concept is proposed, and the focus is to demonstrate monitoring of seawater conditions. The passive sensor was designed by incorporating a temperature-responsive hydrogel with an auxetic star pattern unit cell geometry, which transforms from a two- to three-dimensional geometry when immersed in low temperature liquid. First, the passive sensor was formed by incorporating a temperature-responsive hydrogel at opposite ends of the star pattern. The time-dependent swelling and de-swelling behavior of the copolymer hydrogel was characterized to understand the mechanical strains induced after exposure to low temperature water. Second, the design of the star pattern geometry was optimized, and artificial imperfections in the form of notches were employed to allow shape transformation to take place at appropriate and minimal applied strains. The vision is that these shape morphing structures with integrated antennas can serve as passive sensors, which, when interrogated by a remote reader, can be used to monitor how long overboard sailors have been in a low-temperature open sea environment. © 2023 by DEStech Publi cations, Inc. All rights reserved

关键词： Water temperature

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