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Synthetic Membraneless Droplets for Synaptic-Like Clustering of Lipid Vesicles

Angewandte Chemie 2023年第45期135卷

作者： Dr. Qingchuan Li Qingchun Song Dr. Wei Guo Yang Cao Dr. Xinyu Cui Prof. Dairong Chen Prof. Ho Cheung Shum School of Chemistry & Chemical Engineering National Engineering Research Center for Colloidal Materials Shandong University 27 Shanda Nanlu Jinan Shandong P.R.China Department of Mechanical Engineering The University of Hong Kong Pokfulam Road Hong Kong China Advanced Biomedical Instrumentation Centre Hong Kong Science Park Shatin New Territories Hong Kong (SAR) Hong Kong China Department of Public Health Mudanjiang Medical University Mudanjiang 157000 P. R. China

In eukaryotic cells, the membraneless organelles (MLOs) formed via liquid-liquid phase separation (LLPS) are found to interact intimately with membranous organelles (MOs). One major mode is the clustering of MOs by MLOs, such as the formation of clusters of synaptic vesicles at nerve terminals mediated by the synapsin-rich MLOs. Aqueous droplets, including complex coacervates and aqueous two-phase systems, have been plausible MLO-mimics to emulate or elucidate biological processes. However, neither of them can cluster lipid vesicles (LVs) like MLOs. In this work, we develop a synthetic droplet assembled from a combination of two different interactions underlying the formation of these two droplets, namely, associative and segregative interactions, which we call segregative-associative (SA) droplets. The SA droplets cluster and disperse LVs recapitulating the key functional features of synapsin condensates, which can be attributed to the weak electrostatic interaction environment provided by SA droplets. This work suggests LLPS with combined segregative and associative interactions as a possible route for synaptic clustering of lipid vesicles and highlights SA droplets as plausible MLO-mimics and models for studying and mimicking related cellular dynamics.

关键词： Lipid Vesicles Liquid-Liquid Phase Separation Membraneless Organelles Biomolecular Condensates Synthetic Cell

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Coherent growth and characterization of van der Waals 1T-VSe2 layers on GaAs(111)B using molecular beam epitaxy

arXiv

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arXiv 2020年

作者： Zhu, Tiancong O’Hara, Dante J. Noesges, Brenton A. Zhu, Menglin Repicky, Jacob J. Brenner, Mark R. Brillson, Leonard J. Hwang, Jinwoo Gupta, Jay A. Kawakami, Roland K. Department of Physics Ohio State University ColumbusOH43210 United States Program in Materials Science and Engineering University of California RiversideCA92521 United States Materials Science Division Lawrence Livermore National Laboratory LivermoreCA94550 United States Department of Materials Science and Engineering Ohio State University ColumbusOH43210 United States Department of Electrical and Computer Engineering Ohio State University ColumbusOH43210 United States Semiconductor and Epitaxy Analysis Laboratory Ohio State University ColumbusOH43210 United States

We report epitaxial growth of vanadium diselenide (VSe2) thin films in the octahedrally-coordinated (1T) structure on GaAs(111)B substrates by molecular beam epitaxy. Film thickness from a single monolayer (ML) up to 30 ML is demonstrated. Structural and chemical studies using by x-ray diffraction, transmission electron microscopy, scanning tunneling microscopy and x-ray photoelectron spectroscopy indicate high quality thin films. Further studies show that monolayer VSe2 films on GaAs are not air-stable and are susceptible to oxidation within a matter of hours, which indicates that a protective capping layer should be employed for device applications. This work demonstrates that VSe2, a candidate van der Waals material for possible spintronic and electronic applications, can be integrated with III-V semiconductors via epitaxial growth for 2D/3D hybrid devices. Copyright © 2020, The Authors. All rights reserved.

关键词： Molecular beam epitaxy

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Investigation of thermal parameters in numerical modeling of the laser powder bed fusion process for maraging 300 steel

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materials science and engineering: B 2025年 321卷

作者： Bruno Caetano dos Santos Silva Lucas de Figueiredo Soares Luã Fonseca Seixas J.P. Oliveira Jiajia Shen Rodrigo Santiago Coelho Gilmar Ferreira Batalha SENAI CIMATEC SENAI Innovation Institute for Forming and Joining of Materials Av. Orlando Gomes 1845 Piata 41650-010 Salvador-BA Brazil Department of Mechatronics and Mechanical Systems Engineering Polytechnic School of Engineering University of Sao Paulo Av. Prof. Mello Moraes 2231 Butantã Sao Paulo 05508-030 SP Brazil SENAI CIMATEC University Post-Graduation Program MPDS/GETEC/MCTI Av. Orlando Gomes 1845 Piata 41650-010 Salvador-BA Brazil CENIMAT | i3N Department of Materials Science School of Science and Technology NOVA University Lisbon Caparica Portugal

The development of numerical simulations for metal additive manufacturing (AM) processes to predict distortion and residual stress is considered a strategic tool for supporting the industrialization of AM. However, the complexity of these analyses, due to the intricacies of thermal cycles, demands substantial computational resources and a deep understanding of the key process variables to achieve accurate models. This study aims to evaluate the influence of thermal parameters on the results of thermomechanical simulations using the Inherent Strain Method (ISM). Specifically, the analysis investigates the effects of estimated peak temperatures on thermal analyses, distortion, equivalent stress, and microstructure volume fraction in maraging 300 steel (MS300) parts simulated via finite elements. The results indicate that varying the peak temperature of the models causes a linear change in the thermal simulation output, referred to as the exposed energy fraction (EEF) in the Simufact Additive software, which determines the thermal history of the process in fabricated geometry. However, the distortion behavior—by the mechanical analyses that used the EEF as input—deviated from this linearity across specific regions, emphasizing the need for localized accuracy assessment within complex geometries. Equivalent stress decreased with lower peak temperatures, highlighting a correlation between these factors, while the microstructure volume fraction remained unchanged across different peak temperatures. The simulation results were validated by comparing the simulated measurements with experimental data of the same geometry manufactured via laser powder bed fusion (LPBF). Displacement in the simulation was assessed by comparing the diameters of the front and back faces, as well as through surface deviation analysis, which highlighted variations between the scanned experimental geometry and the simulated part. Additionally, the microstructure of the experimental part was examine

关键词： Thermal cycling

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Topology of three-dimensional Dirac semimetals and generalized quantum spin Hall systems without gapless edge modes

arXiv

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arXiv 2020年

作者： Tyner, Alexander C. Sur, Shouvik Puggioni, Danilo Rondinelli, James M. Goswami, Pallab Graduate Program in Applied Physics Northwestern University EvanstonIL60208 United States Department of Physics and Astronomy Northwestern University EvanstonIL60208 United States Department of Materials Science and Engineering Northwestern University IL60208 United States Northwestern Argonne Institute for Science and Engineering EvanstonIL60208 United States

Usually the quantum spin Hall states are expected to possess gapless, helical edge modes. Are there clean, non-interacting, quantum spin Hall states without gapless, edge modes? We show the generic, n-fold-symmetric, momentum planes of three-dimensional, stable Dirac semi-metals, which are orthogonal to the direction of nodal separation are examples of such generalized quantum spin Hall systems. We demonstrate that the planes lying between two Dirac points and the celebrated Bernevig-Zhang-Hughes model support identical quantized, non-Abelian Berry flux of magnitude 2π. Consequently, both systems exhibit spin-charge separation in response to electromagnetic, π-flux vortex. The Dirac points are identified as the unit-strength, monopoles of SO(5) Berry connections, describing topological quantum phase transitions between generalized, quantum spin Hall and trivial insulators. Our work identifies precise bulk invariant and quantized response of Dirac semimetals and shows that many two-dimensional higher-order topological insulators can be understood as generalized quantum spin Hall systems, possessing gapped edge states. Copyright © 2020, The Authors. All rights reserved.

关键词： Fruits

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Recent advances in lithographic fabrication of micro-/nanostructured polydimethylsiloxanes and their soft electronic applications

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Journal of Semiconductors 2019年第11期40卷 48-65页

作者： Donghwi Cho Junyong Park Taehoon Kim Seokwoo Jeon Department of Materials Science and Engineering KAIST Institute for the NanoCenturyKorea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea School of Materials Science and Engineering Kumoh National Institute of TechnologyGumiGyeongbuk 39177Republic of Korea Department of Biomedical Engineering Tufts UniversityMedfordMassachusetts02155USA

The intensive development of micro-/nanotechnologies offers a new route to construct sophisticated architectures of emerging soft *** the many classes of stretchable materials,micro-/nanostructured poly(dimethylsiloxane)(PDMS)has emerged as a vital building block based on its merits of flexibility,stretchability,simple processing,and,more importantly,high degrees of freedom of incorporation with other functional materials,including metals and *** artificially designed geometries play important roles in achieving the desired mechanical and electrical performances of devices and thus show great potential for applications in the fields of stretchable displays,sensors and actuators as well as in health-monitoring device ***,novel lithographic methods to produce stretchable platforms with superb reliability have recently attracted research *** aim of this review is to comprehensively summarize the progress regarding micro-/nanostructured PDMS and their promising soft electronic *** review is concluded with a brief outlook and further research directions.

关键词： lithographic technique microstructure nanostructure polydimethylsiloxane soft electronics

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Phonon lifetimes and mode softening in cubic Cs 2 AgBiBr 6

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Newton 2025年第4期1卷

作者： Zihan Zhang Peter M. Gehring Adam H. Slavney Julian A. Vigil Tao Hong Jose A. Rodriguez-Rivera Johan Klarbring Hemamala I. Karunadasa Michael F. Toney Nicholas J. Weadock Physics Department University of Colorado Boulder CO 80309 USA NIST Center for Neutron Research National Institute of Standards and Technology Gaithersburg MD 20899-6100 USA Department of Chemistry Stanford University Stanford CA 94305 USA Department of Chemical Engineering Stanford University Stanford CA 94305 USA Neutron Scattering Division Oak Ridge National Laboratory Oak Ridge TN 37831 USA Department of Materials Science University of Maryland College Park MD 20742 USA Theoretical Physics Division Department of Physics Chemistry and Biology (IFM) Linköping University Linköping 581 83 Sweden Stanford Institute for Materials and Energy Sciences SLAC National Accelerator Laboratory Menlo Park CA 94025-7015 USA Department of Chemical and Biological Engineering University of Colorado Boulder CO 80309 USA Materials Science and Engineering Program University of Colorado Boulder CO 80309 USA Renewable and Sustainable Energy Institute (RASEI) University of Colorado Boulder CO 80309 USA

Metal halide perovskites (MHPs) have emerged as noteworthy candidates for photovoltaic applications in recent years. Their high power-conversion efficiency is largely attributed to the structure-function relationship, which is not well understood. In this study, we examine the low-frequency phonons of the double perovskite Cs 2 AgBiBr 6 using neutron inelastic scattering. We find that the acoustic phonon lifetimes decrease from 16 to 3 ps along Γ to X , which is indicative of significant anharmonicity that contributes to the ultralow thermal conductivity. Additionally, we observe a linear temperature dependence of the square of the zone-center soft optical phonon energy, which is consistent with a weakly first-order displacive cubic-tetragonal structural phase transition. These results provide a deeper understanding of the lattice dynamics and phase transitions in MHPs as well as the effects of anharmonicity by comparison with prototypical hybrid organic-inorganic MHPs, ( CH 3 NH 3 ) PbX 3 (X = Br, I).

关键词： lead-free perovskite neutron inelastic scattering displacive phase transition soft optical phonon

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Theoretical study on adsorption and reaction of polymeric formic acid on the Cu(111) surface

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Physical Review materials 2021年第7期5卷 075801-075801页

作者： Septia Eka Marsha Putra Fahdzi Muttaqien Yuji Hamamoto Kouji Inagaki Akitoshi Shiotari Jun Yoshinobu Yoshitada Morikawa Ikutaro Hamada Department of Precision Engineering Graduate School of Engineering Osaka University 2-1 Yamada-oka Suita Osaka 565-0871 Japan Department of Engineering Physics Institut Teknologi Sumatera Jalan Terusan Ryacudu Way Hui Jati Agung South Lampung 35365 Indonesia Instrumentation and Computational Physics Research Group Faculty of Mathematics and Natural Sciences Institut Teknologi Bandung Jalan Ganesha 10 Bandung West Java 40132 Indonesia Master Program in Computational Science Faculty of Mathematics and Natural Sciences Institut Teknologi Bandung Jalan Ganesha 10 Bandung West Java 40132 Indonesia Elements Strategy Initiative for Catalysts and Batteries (ESICB) Kyoto University Goryo-Ohara Nishikyou-ku Katsura Kyoto 615-8245 Japan Department of Advanced Materials Science The University of Tokyo 5-1-5 Kashiwanoha Kashiwa Chiba 277-8561 Japan The Institute for Solid State Physics The University of Tokyo 5-1-5 Kashiwanoha Kashiwa Chiba 277-8581 Japan Research Center for Precision Engineering Graduate School of Engineering Osaka University 2-1 Yamada-oka Suita Osaka 565-0871 Japan

We investigate the polymeric adsorption of formic acid (HCOOH) on the Cu(111) surface by means of density functional theory. We present structural models for the polymeric form of HCOOH on Cu(111) and characterize their stability, electronic, and vibrational properties. Based on the energetics and dynamics, as well as simulated scanning tunneling microscopy and atomic force microscopy images, we propose that the α polymorph is likely to be formed on the Cu(111) surface and can explain the experimental findings. We also study the initial step of the catalytic dehydrogenation of HCOOH and find that the O-H bond dissociation at the edge of the polymer is facilitated, rather than that forming hydrogen bonding, agreeing well with the experiments.

关键词： Adsorption Chemical bonding Chemical kinetics, dynamics & catalysis Electronic structure Surface & interfacial phenomena Surfaces Density functional theory First-principles calculations

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Precision measurements of muonium and muonic helium hyperfine structure at J-PARC

arXiv

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arXiv 2025年

作者： Strasser, Patrick Abe, Mitsushi Asai, Kanta Fukumura, Seiso Fushihara, Mahiro Goto, Yu Ino, Takashi Iwai, Ryoto Kanda, Sohtaro Kawamura, Shiori Kitaguchi, Masaaki Nishimura, Shoichiro Oku, Takayuki Okudaira, Takuya Powell, Adam Sasaki, Ken-Ichi Shimizu, Hirohiko M. Shimomura, Koichiro Tada, Hiroki Torii, Hiroyuki A. Yamanaka, Takashi Yamazaki, Takayuki 1-1 Oho Ibaraki Tsukuba305-0801 Japan Materials and Life Science Division J-PARC Center 2-4 Shirakata Tokai-mura Naka-gun Ibaraki319-1195 Japan Materials Structure Science Program Graduate Institute for Advanced Studies SOKENDAI 1-1 Oho Ibaraki Tsukuba305-0801 Japan 1-1 Oho Ibaraki Tsukuba305-0801 Japan Graduate School of Science Nagoya University Furo-cho Chikusa-ku Aichi Nagoya464-8601 Japan Department of Physics Niigata University 8050 Ikarashi 2-no-cho Nishi-ku Niigata-shi Niigata950-2181 Japan Facility for Rare Isotope Beams Michigan State University 640 South Shaw Lane East LansingMI48824 United States Kobayashi-Maskawa Institute Nagoya University Furo-cho Chikusa-ku Aichi Nagoya464-8601 Japan 2-4 Shirakata Tokai-mura Naka-gun Ibaraki319-1195 Japan Graduate School of Science and Engineering Ibaraki University 2-1-1 Bunkyo Ibaraki Mito310-8512 Japan Department of Physics and Astronomy University of Calgary 2500 University Drive NW CalgaryABT2N 1N4 Canada School of Science The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo113-0033 Japan Faculty of Arts and Science Kyushu University 744 Motooka Nishi Fukuoka819-0395 Japan

At the J-PARC Muon science Facility (MUSE), the MuSEUM collaboration is now performing new precision measurements of the ground state hyperfine structure (HFS) of both muonium and muonic helium atoms. High-precision measurements of the muonium ground-state HFS are recognized as one of the most sensitive tools for testing bound-state quantum electrodynamics theory to precisely probe the standard model and determine fundamental constants of the positive muon magnetic moment and mass. The same technique can also be employed to measure muonic helium HFS, obtain the negative muon magnetic moment and mass, and test and improve the theory of the three-body atomic system. Measurements at zero magnetic field have already yielded more accurate results than previous experiments for both muonium and muonic helium atoms. High-field measurements are now ready to start collecting data using the world’s most intense pulsed muon beam at the MUSE H-line. We aim to improve the precision of previous measurements ten times for muonium and a hundred times or more for muonic helium. We review all the key developments for these new measurements, focusing on the high-field experiment, and report the latest results and prospects. Copyright © 2025, The Authors. All rights reserved.

关键词： Microwave spectroscopy

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Pumpless platform for high-throughput dynamic multicellular culture and chemosensitivity evaluation

Pumpless platform for high-throughput dynamic multicellular ...

引用

42nd Society for Biomaterials Annual Meeting and Exposition 2019: The Pinnacle of Biomaterials Innovation and Excellence

作者： Chen, Zhehuan He, Songmin Zilberberg, Jenny Lee, Woo Department of Chemical Engineering and Materials Science Stevens Institute of Technology 1 Castle Point on Hudson HobokenNJ07030 United States Department of Biomedical Research Hackensack University Medical Center HackensackNJ07601 United States

ISBN: (纸本)9781510883901

Statement of Purpose: A major challenge with evaluating the drug response of patient-derived tumor cells is the significant lack of clinically relevant, high-throughput and inexpensive in vivo and in vitro models. Traditional well-plate-based drug assay is widely used in industry because of its standardized format for automatic handling and high content imaging. However, it has become difficult to keep the viability of patient-derived MM cells (PMMC) over several hours using conventional cell culture techniques. We recently developed and demonstrated a 96-well plate based perfusion device that can be used to maintain the viability and proliferative capability of PMMCs over 3 weeks. However, the high-throughput operation of this culture platform is limited because the use of external pumps and tubing connections is labor–intensive and error prone to cause bubble formation and fluid leakage. © 2019 Omnipress - All rights reserved.

关键词： Leakage (fluid)

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Combinatorial discovery of small molecule-doped afterglow polymer composites for anti-counterfeiting

FlexMat

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FlexMat 2024年

作者： Yeqing Lu Xue Chen Yung Doug Suh Xiaowang Liu Frontiers Science Center for Flexible Electronics (FSCFE) MIIT Key Laboratory of Flexible Electronics (KLoFE) Shaanxi Key Laboratory of Flexible Electronics Xi'an Key Laboratory of Flexible Electronics Xi'an Key Laboratory of Biomedical Materials & Engineering Xi'an Institute of Flexible Electronics Institute of Flexible Electronics (IFE) Xi'an Shaanxi China Northwestern Polytechnical University Xi'an Shaanxi China Department of Chemistry and School of Energy and Chemical Engineering UNIST Ulsan Republic of South Korea

The exploration of afterglow in small molecule-doped polymer composites, rooted in a nuanced understanding of structure-properties relationships, holds paramount importance for optoelectronics. However, conventional strategies face challenges in achieving high-throughput discovery of these polymers. This study introduces a novel combinatorial approach, employing photoinitiated solvent-free polymerization, to craft afterglow aromatic boronic acid-doped polymer composites. The afterglow activation results from stabilizing the triplet states of doped small molecules through a synergy of chemical and physical fixation effects. Aromatic boronic acids emerge as crucial dopants, exhibiting versatility in afterglow development across the visible spectrum. Notably, the influence of functional groups and the number of non-fused benzene rings on afterglow wavelengths is minimal, while significantly impacting afterglow lifetimes. Besides conjugation degrees, the optimal size and doping concentrations of dopants play a pivotal role in extending afterglow lifetimes. This strategy not only facilitates exploration of small molecule-based afterglow materials but also enables the feasible fabrication of intricate, multicolor afterglow polymeric objects via a step-polymerization strategy for anti-counterfeiting.

关键词： afterglow combinatorial methods doping step-polymerization triplet emission

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