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arXiv 2024年

作者： Zhang, Bo-Wen Qiu, Xi-Yang Ma, Yicheng Hu, Qingmei Fitó-Parera, Aina Kohata, Ikuma Feng, Ya Zheng, Yongjia Zhang, Chiyu Matsuo, Yutaka Wang, YuHuang Chiashi, Shohei Otsuka, Keigo Xiang, Rong Levshov, Dmitry I. Cambré, Sofie Wenseleers, Wim Rotkin, Slava V. Maruyama, Shigeo Department of Mechanical Engineering The University of Tokyo Tokyo113-8656 Japan State Key Laboratory of Fluid Power and Mechatronic Systems School of Mechanical Engineering Zhejiang University Hangzhou310027 China Theory and Spectroscopy of Molecules and Materials Department of Physics University of Antwerp Antwerp2610 Belgium Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education School of Energy and Power Engineering Dalian University of Technology Liaoning 116024 China Department of Chemistry and Biochemistry Chemical Physics Program Maryland Nano Center University of Maryland College ParkMD20742 United States Department of Chemical Systems Engineering Graduate School of Engineering Nagoya University Nagoya464-8603 Japan Institute of Materials Innovation Institutes for Future Society Nagoya University Nagoya464-8603 Japan Theory and Spectroscopy of Molecules and Materials Department of Chemistry University of Antwerp Antwerp2610 Belgium Nanostructured and Organic Optical and Electronic Materials Department of Physics University of Antwerp Antwerp2610 Belgium Materials Research Institute Department of Engineering Science & Mechanics The Pennsylvania State University University ParkPA16802 United States

Carbyne, a one-dimensional (1D) carbon allotrope with alternating triple and single bonds, has the highest known mechanical strength but is unstable to bending, limiting synthesis to short linear chains. Encapsulation within carbon nanotubes (CNTs) stabilizes carbyne, forming confined carbyne (CC), thus enabling further research concerning attractive 1D physics and materials properties of carbyne. While CC has been synthesized in multi-walled CNTs (MWCNTs) using the arc-discharge method and in double-walled CNTs (DWCNTs) via high-temperature high-vacuum (HTHV) method, synthesis in single-walled CNTs (SWCNTs) has been challenging due to their fragility under such conditions. In this work, we report a low-temperature method to synthesize CC inside SWCNTs (CC@SWCNT). By annealing SWCNTs containing ammonium deoxycholate (ADC) at 400°C, ADC is converted into CC without damaging the SWCNTs. Raman spectroscopy revealed a strong CC phonon (CC-mode) peak at 1860–1870 cm-1, much stronger than the SWCNT G-band peak, confirming a high fraction of CC in the resulting material. The Raman mapping result showed the uniformity of the CC-mode signal across the entire film sample, proving the high efficiency of this method in synthesizing CC in every SWCNT of appropriate size. Notably, the CC-mode peaks of CC@SWCNT (above 1860 cm-1) are higher than those reported in previous CC@CNT samples (mostly -1). This is attributed to larger SWCNT diameters (>0.95 nm) used in this study, compared to the typical 0.6–0.8 nm range. Larger diameters result in reduced confinement, allowing carbyne to closely resemble free-standing carbyne while remaining stabilized. This low-temperature synthesis of long-chain, nearly freestanding carbyne within large-diameter SWCNTs offers new opportunities for exploring 1D physics and the unique properties of carbyne for potential applications. © 2024, CC BY-NC-ND.

关键词： Single-walled carbon nanotubes (SWCN)

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Nanoscale Manipulation of Single-Molecule Conformational Transition through Vibrational Excitation

arXiv

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arXiv 2024年

作者： Quan, Weike Wang, Zihao Shi, Yueqing Liang, Kangkai Bi, Liya Zhou, Hao Yin, Zhiyuan Li, Wan-Lu Li, Shaowei Department of Chemistry and Biochemistry University of California La Jolla San DiegoCA92093-0309 United States Program in Materials Science and Engineering University of California La Jolla San DiegoCA92093-0418 United States Aiiso Yufeng Li Family Department of Chemical and Nano Engineering University of California La Jolla San DiegoCA92093-0448 United States

On-demand control of molecular actions is essential for realizing single-molecule functional devices. Such a control can be achieved by manipulating interactions between individual molecules and their nanoscale environment. In this study, we manipulate the conformational transition of a single pyrrolidine molecule on a Cu(100) surface by exciting its vibrations with tunneling electrons using scanning tunneling microscopy. Multiple transition pathways between two structural states are identified to be driven by distinct vibrational modes, whose corresponding nuclear motions are determined by density functional theory calculations. Tip-induced van der Waals forces and intermolecular interactions enable precise tuning of molecule-environment interactions, allowing modulation of vibrational energies, alteration of transition probabilities, and selection of the lowest energy transition pathway. This work reveals how external force fields in a tunable nanocavity can modulate molecular conformational transitions, offering an approach to deliberately engineer molecule-environment interactions for specific molecular functions. © 2024, CC BY.

关键词： Van der Waals forces

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Low Threshold Plasmonic Lattice Laser Based on CsPbBr3 Quantum Dots with Directional Emission

Low Threshold Plasmonic Lattice Laser Based on CsPbBr3 Quant...

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Pacific Rim Conference on Lasers and Electro-Optics (CLEO/Pacific Rim)

作者： Di Xing Cheng-Chieh Lin Ya-Lun Ho Yang-Chun Lee Mu-Hsin Chen Bo-Wei Lin Chun-Wei Chen Jean-Jacques Delaunay School of Engineering The University of Tokyo Tokyo Japan International Graduate Program of Molecular Science and Technology (NTU-MST) National Taiwan University and Academia Sinica Taipei Taiwan Department of Materials Science and Engineering National Taiwan University Taipei Taiwan Molecular Science and Technology Program Taiwan International Graduate Program (TIGP) Academia Sinica Taipei Taiwan Center of Atomic Initiative for New Materials (AI-MAT) National Taiwan University Taipei Taiwan

Metallic nanoparticles array is served as a promising way to realize on-chip lasers. To achieve high-performance lasers, efficient gain media are also critical. Here, we present a pressure-assisted process for CsPbBr3...

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Tumor vasculature vs tumor cell targeting: Understanding the latest trends in using functional nanoparticles for cancer treatment

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OpenNano 2023年 11卷

作者： Awad, Nahid S Salkho, Najla M Abuwatfa, Waad H Paul, Vinod AlSawaftah, Nour M Husseini, Ghaleb A Department of Chemical Engineering College of Engineering American University of Sharjah Sharjah P.O. Box 26666 United Arab Emirates Materials Science and Engineering Program College of Arts and Sciences American University of Sharjah Sharjah P.O. Box 26666 United Arab Emirates

Delivering drugs to tumors using nanoparticles (NPs) has shown promising potential in promoting targeted drug delivery of antineoplastic agents to enhance their efficiency while reducing the associated systemic toxicity. This review highlights the different types of NPs and the physiological characteristics of the tumor microenvironment (TME), and the mechanisms undertaken to safely deliver drugs to specific lesions. We review the principles and latest developments in the field of targeted NPs designed to target tumor vasculature compared to those designed to target cancer cells and their correlation with the TME. We discuss the advantages and limitations of each targeted drug delivery mechanism and future directions aiming to maximize their potential. © 2023 The Author(s)

关键词： Cancer treatment Cell targeting Nanoparticles Tumor Tumor vasculature

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Electron Energy Loss Spectroscopy of Nanoscale Local Structure in Calcium Silicate Hydrate

SSRN

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SSRN 2023年

作者： Liang, Chengyao Jiang, Jinyang Roya, Maboudian Monteiro, Paulo J.M. Li, Shaofan Zheng, Qi Department of Civil and Environmental Engineering University of California BerkeleyCA94720 United States Materials Sciences Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States National Center for Electron Microscopy Molecular Foundry Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Department of Chemical and Biomolecular Engineering University of California BerkeleyCA94720 United States School of Materials Science and Engineering United States

Calcium silicate hydrate (C-S-H) is a crucial cement hydration product for the strength and durability of concrete. While previous studies have extensively investigated the structural and compositional characteristics of C-S-H, they mostly focused on average properties within ensemble systems. In this work, we use electron energy loss spectroscopy (EELS), electron nano-tomography, and other spectroscopies to study the local structure of C-S-H at an unprecedented spatial resolution of 5 nm. The chemical environments of silicon (Si) and calcium (Ca) elements, thickness, and dielectric properties are scrutinized. Statistical analysis of over 10,000 data points reveals significant heterogeneity in the silicate chemical environment, including different polymerization degrees and tetrahedral distortions. In contrast, the local Ca environment exhibits more homogeneity with a coordination number ranging from 7 to 9, indicating a weak octahedral-like symmetry for C-S-H. This work provides insights into the local structural features of C-S-H from the single colloid perspective. © 2023, The Authors. All rights reserved.

关键词： Electron energy loss spectroscopy

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Operating a Multi-Level molecular Dimer Switch through Precise Tip-Molecule Control

arXiv

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arXiv 2024年

作者： Shi, Yueqing Quan, Weike Bi, Liya Wang, Zihao Liang, Kangkai Zhou, Hao Yin, Zhiyuan Li, Wan-Lu Li, Shaowei Department of Chemistry and Biochemistry University of California La Jolla San DiegoCA92093-0309 United States Program in Materials Science and Engineering University of California La Jolla San DiegoCA92093-0418 United States Aiiso Yufeng Li Family Department of Chemical and Nano Engineering University of California La Jolla San DiegoCA92093-0448 United States

Controlling structural transitions between molecular configurations is crucial for advancing functional molecular electronics. While reversible switching of bistable two-state molecules has been achieved, creating molecular systems that can be controllably switched between multiple configurations often requires complex synthetic methods, presenting a much greater challenge. In this study, we showcase a straightforward yet effective strategy to create and control transitions between multiple molecular structural states by forming a surface-bound molecular dimer. Using low-temperature scanning tunneling microscopy, we induce and characterize the structural transitions of a pyrrolidine dimer on a Cu(100) surface. The intermolecular interactions open new energy transfer channels, enabling excitation through pathways that were inaccessible in monomers. The occupation of different molecular states is highly sensitive to both the energy of the tunneling electrons and the interaction with the STM tip. By precisely adjusting the tip-molecule distance, we can select the most probable structural configuration based on sample bias, thereby achieving on-demand control of this molecular dimer switch. This work highlights an approach that leverages both intermolecular and molecule-cavity interactions to create and control an artificially fabricated molecular device. © 2024, CC BY.

关键词： Molecules

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Editorial for the Special Issue on "Computational materials science"

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Advanced Theory and Simulations 2023年第10期6卷

作者： Caspary Toroker, Maytal Pavone, Michele Department of Materials Science and Engineering Technion-Israel Institute of Technology Haifa3200003 Israel The Nancy and Stephen Grand Technion Energy program Haifa Israel Department of Chemical Sciences University of Naples Federico II via Cintia 21 NaplesCAP 80126 Italy

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Charge transport modulation by a redox supramolecular spin-filtering chiral crystal

arXiv

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arXiv 2023年

作者： Verhage, Michael Bampoulis, Pantelis Preuss, Marco D. Filot, Ivo Friedrich, Heiner Joosten, Rick R.M. Meijer, E.W. Flipse, Kees Molecular Materials and Nanosystems Department of Applied Physics Eindhoven University of Technology Netherlands Faculty of Science and Technology Physics of Interfaces and Nanomaterials University of Twente Netherlands Eindhoven University of Technology PO Box 513 Eindhoven5600 MB Netherlands Laboratory of Macromolecular and Organic Chemistry Eindhoven University of Technology Netherlands Inorganic Materials & Catalysis Department of Chemical Engineering and Chemistry Eindhoven University of Technology Netherlands Laboratory of Physical Chemistry Department of Chemical Engineering Eindhoven University of Technology Eindhoven5600 MB Netherlands Center for Multiscale Electron Microscopy Department of Chemical Engineering Eindhoven University of Technology Eindhoven5600 MB Netherlands

The chirality induced spin selectivity (CISS) effect is a fascinating phenomena correlating molecular structure with electron spin-polarisation in excited state measurements. Experimental procedures to quantify the spin-filtering magnitude relies generally on averaging data sets, especially those from magnetic field dependent conductive-AFM. We investigate the underlying observed disorder in the IV spectra and the origin of spikes superimposed. We demonstrate and explain that a dynamic, voltage sweep rate dependent, phenomena can give rise to complex IV curves for chiral crystals of coronene bisimide. The redox group, able to capture localized charge states, acts as an "impurity" state interfering with a continuum, giving rise to Fano resonances. We introduce a novel mechanism for the dynamic transport which might also provide insight into the role of spin-polarization. Crucially, interference between charge localisation and delocalisation during transport may be important properties into understanding the CISS phenomena. © 2023, CC BY.

关键词： Magnetic moments

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Characterization of Water-Soluble Inorganic Ions and Carbonaceous Aerosols in the Urban Atmosphere in Amman, Jordan

SSRN

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SSRN 2024年

作者： Al-Hunaiti, Afnan Bakri, Zaid Li, Xinyang Duan, Lian Al-Abdallat, Asal Alastuey, Andres Viana, Mar Arar, Sharif Petäjä, Tuukka Hussein, Tareq Department of Chemistry School of Science University of Jordan Amman11942 Jordan Department of Chemistry and Materials Science School of Chemical Engineering Nanochemistry and Nanoengineering Aalto University Aalto00076 Finland Department of Physics and Atmospheric Sciences Program Michigan Technological University HoughtonMI49931 United States UHELFI- Helsinki00014 Finland Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention Department of Environmental Science & Engineering Fudan University Shanghai200438 China Department of Physics School of Science University of Jordan Amman11942 Jordan Barcelona08034 Spain

The Eastern Mediterranean is a unique region for air pollution because it is the crossroads between three continents exchanging air pollution. Here, we investigated urban particulate matter (PM) carbonaceous and water-soluble ions in Amman, Jordan. The PM2.5 total carbon (TC) annual mean was 7.6±3.6 µg/m3 (organic carbon (OC) 5.9±2.8 µg/m3 and elemental carbon (EC) 1.7±1.1 µg/m3), which was about 16.3% of the PM2.5. The PM10 TC annual mean was 8.4±3.9 µg/m3 (OC 6.5 ± 3.1 µg/m3 and elemental carbon (EC) 11.9±1.1µg/m3), about 13.3% of the PM10. The PM2.5 total water-soluble ions annual mean was 7.9±1.9 µg/m3 (about 16.9%), and that of the PM10 was 10.1±2.8 µg/m3 (about 16.0%). The minor ions (F-, NO2-, Br-, and PO43-) constituted less than 1% in the PM fractions. The significant fraction was for SO42- (PM2.5 4.7±1.6 µg/m3 (10.0%) and PM10 5.3±1.9 µg/m3 (8.3%)). The NH4+ had higher amounts of PM2.5 (1.3±0.6 µg/m3;2.7%) than that PM10 (0.9±0.4 µg/m3;1.4%). During sand and dust storm (SDS) events, TC, Cl-, and NO3- were doubled in PM, SO42- did not increase significantly, and NH4+ slightly decreased. Regression analysis revealed: (1) carbonaceous aerosols come equally from primary and secondary sources, (2) about 50% of the OC came from non-combustion sources, (3) traffic emissions dominate the PM, (4) agricultural sources have a negligible effect, (5) SO42- is completely neutralized by NH4+ in the PM2.5 but there could be additional reactions involved in the PM10, and (6) (NH4)2SO4, was the major species formed by SO42-and NH4+ instead of NH4HSO4. © 2024, The Authors. All rights reserved.

关键词： Ions

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Opto-thermoelectric pulling of light-absorbing particles

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Light(science & Applications) 2020年第1期9卷 1686-1696页

作者： Linhan Lin Pavana Siddhartha Kollipara Abhay Kotnala Taizhi Jiang Yaoran Liu Xiaolei Peng Brian A.Korgel Yuebing Zheng Walker Department of Mechanical Engineering The University of Texas at AustinAustinTX 78712USA Materials Science&Engineering Program and Texas Materials Institute The University of Texas at AustinAustinTX 78712USA State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision InstrumentTsinghua UniversityBeijing 100084People’s Republic of China McKetta Department of Chemical Engineering The University of Texas at AustinAustinTX 78712USA Department of Electrical and Computer Engineering The University of Texas at AustinAustinTX 78712USA

Optomechanics arises from the photon momentum and its exchange with low-dimensional *** is well known that optical radiation exerts pressure on objects,pushing them along the light ***,optical pulling of an object against the light path is still a counter-intuitive ***,we present a general concept of optical pulling-opto-thermoelectric pulling(OTEP)—where the optical heating of a light-absorbing particle using a simple plane wave can pull the particle itself against the light *** irradiation orientation-directed pulling force imparts self-restoring behaviour to the particles,and three-dimensional(3D)trapping of single particles is achieved at an extremely low optical intensity of 10^(−2)mWμm^(−2).Moreover,the OTEP force can overcome the short trapping range of conventional optical tweezers and optically drive the particle flow up to a macroscopic *** concept of selfinduced opto-thermomechanical coupling is paving the way towards freeform optofluidic technology and lab-on-achip devices.

关键词： absorbing light trapping

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