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arXiv 2022年

作者： Annerino, Anthony Faltas, Michael Srinivasan, Manoj Gouma, Pelagia-Irene Material Science and Engineering The Ohio State University ColumbusOH43210 United States Mechanical and Aerospace Engineering The Ohio State University ColumbusOH43210 United States Program in Biophysics The Ohio State University ColumbusOH43210 United States

Most research aimed at measuring biomarkers on the skin is only concerned with sensing chemicals in sweat using electrical signals, but these methods are not truly non-invasive nor non-intrusive because they require substantial amounts of sweat to get a reading. This project aims to create a truly noninvasive wearable sensor that continuously detects the gaseous acetone (a biomarker related to metabolic disorders) that ambiently comes out of the skin. Composite films of polyaniline and cellulose acetate, exhibiting chemo-mechanical actuation upon exposure to gaseous acetone, were tested in the headspaces above multiple solutions containing acetone, ethanol, and water to gauge response sensitivity, selectivity, and repeatability. The bending of the films in response to exposures to these environments was tracked by an automatic video processing code, which was found to out-perform an off-the-shelf deep neural network-based tracker. Using principal component analysis, we showed that the film bending is low dimensional with over 90% of the shape changes being captured with just two parameters. We constructed forward models to predict shape changes from the known exposure history and found that a linear model can explain 40% of the observed variance in film tip angle changes. We constructed inverse models, going from third order fits of shape changes to acetone concentrations where about 45% of the acetone variation and about 30% of ethanol variation are captured by linear models, and non-linear models did not perform substantially better. This suggests there is sufficient sensitivity and inherent selectivity of the films. These models, however, provide evidence for substantial hysteretic or long-time-scale responses of the PANI films, seemingly due to the presence of water. Further experiments will allow more accurate discrimination of unknown exposure environments. Nevertheless, the sensor will operate with high selectivity in low sweat body locations, like behind the

关键词： Acetone

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Dynamic twisting and imaging of moiré crystals

arXiv

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arXiv 2023年

作者： Zhang, Qixuan Senaha, Trevor Zhang, Ruolun Wu, Chen Lyu, Lingyuan Cao, Leonard W. Tresback, Jason Dai, Andrew Watanabe, Kenji Taniguchi, Takashi Allen, Monica T. Program in Material Science and Engineering University of California San DiegoCA92093 United States Department of Physics University of California San DiegoCA92093 United States Center for Nanoscale Systems Harvard University CambridgeMA02138 United States National Institute for Materials Science Namiki 1-1 Ibaraki Tsukuba305-0044 Japan

The electronic band structure is an intrinsic property of solid-state materials that is intimately connected to the crystalline arrangement of atoms. Moiré crystals, which emerge in twisted stacks of atomic layers, feature a band structure that can be continuously tuned by changing the twist angle between adjacent layers [1–4]. This class of artificial materials blends the discrete nature of the moiré superlattice with intrinsic symmetries of the constituent materials, providing a versatile platform for investigation of correlated phenomena whose origins are rooted in the geometry of the superlattice, from insulating states at "magic angles" [5–8] to flat bands in quasicrystals [9]. Here we present a route to mechanically tune the twist angle of individual atomic layers with a precision of a fraction of a degree inside a scanning probe microscope, which enables continuous control of the electronic band structure in situ. Using nanostructured rotor devices, we achieve the collective rotation of a single layer of atoms with minimal deformation of the crystalline lattice. In twisted bilayer graphene, we demonstrate nanoscale control of the moiré superlattice periodicity via external rotations, as revealed using piezoresponse force microscopy [10]. We also extend this methodology to create twistable boron nitride devices, which could enable dynamic control of the domain structure of moiré ferroelectrics [11–13]. This approach provides a route for real-time manipulation of moiré materials, allowing for systematic exploration of the phase diagrams at multiple twist angles in a single device. © 2023, CC BY.

关键词： Atoms

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Effect of TiO 2 concentration in PVDF-TiO 2 -PVP mixed matrix membrane performance using ultrafiltration process

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materials Today: Proceedings 2024年 96卷 1-5页

作者： Rianyza Gayatri Erna Yuliwati Ahmad Noor Syimir Fizal Muhamad Zulhilmi Zailani Juhana Jaafar Muzafar Zulkifli Wirach Taweepreda Ahmad Naim Ahmad Yahaya Universiti Kuala Lumpur Malaysian Institute of Chemical and Bioengineering Technology Alor Gajah Melaka 78000 Malaysia Department of Material Science and Technology Faculty of Science Prince of Songkla University (PSU) Hat Yai Songkla 90110 Thailand Program Study of Chemical Engineering Faculty of Engineering Universitas Muhammadiyah Palembang Jalan A.Yani 13 Ulu Kota Palembang 30263 Indonesia Centre for Sustainability of Ecosystem & Earth Resources (Pusat ALAM) Universiti Malaysia Pahang Lebuh Persiaran Tun Khalil Yaakob 26300 Gambang Pahang Malaysia Advanced Membrane Technology Research Centre (AMTEC) Faculty of Chemical and Energy Engineering Universiti Teknologi

This study investigated how the addition of hydrophilic TiO 2 to a porous asymmetric polyvinylidene fluoride (PVDF) Ultrafiltration (UF) membrane altered its properties and performance. The hydrophilicity and flux of PVDF and polyvinylpyrrolidone (PVP) combinations will be lower, and TiO 2 will significantly impact raising those values. By mixing titanium dioxide (TiO 2 ) nanoparticles with a pore-forming agent in a dope solution, PVDF-TiO 2 -PVP membranes were prepared via non-solvent-induced phase inversion method. Experiments using PVDF membranes with varying concentrations of TiO 2 (0, 0.25, 0.5, 1, 1.5, and 2% wt) were applied to evaluate pure water flux and Bovine Serum Albumin (BSA) flux. The functional group composition of membranes was investigated by Fourier transform infrared spectroscopy. The wettability of porous membranes was determined by measuring contact angles. Results demonstrated that membranes constructed from PVDF/PVP/TiO 2 with a lower loading of TiO 2 nanoparticles had a smaller mean pore size, more apertures inside the membrane, and better membrane hydrophilicity. The highest flux of pure water (121 L/m 2 h) was achieved by the PVDF-TiO 2 -PVP mixed-matrix membrane at a TiO 2 concentration of 2 wt%.

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Quantum oscillation studies of the nodal line semimetal Ni3In2S2-xSex

arXiv

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arXiv 2025年

作者： Sharma, M.M. Chhetri, Santosh Karki Acharya, Gokul Graf, David Upreti, Dinesh Dahal, Sagar Un Nabi, Md Rafique Rahman, Sumaya Sakon, Josh Churchill, Hugh O.H. Hu, Jin Department of Physics University of Arkansas FayettevilleAR72701 United States National High Magnetic Field Lab TallahasseeFL32310 United States MonArk NSF Quantum Foundry University of Arkansas FayettevilleAR72701 United States Material Science and Engineering Program Institute for Nanoscience and Engineering University of Arkansas FayettevilleAR72701 United States Department of Chemistry & Biochemistry University of Arkansas FayettevilleAR72701 United States

Ternary shandite compounds with the general formula T3M2X2 (T = Ni, Co, Rh or Pd;M = Sn, In, or Pb;and X = S or Se) have emerged as a large pool of topological semimetals. This family of compounds hosts different topological phases for various combinations of T, M and X. This paper reports the observation of quantum oscillations under the high magnetic fields in Ni3In2S2-xSex single crystals. Angular dependence of oscillation frequency suggests an evolution of the Fermi surface from three-dimensional to two-dimensional on Se substitution for S in Ni3In2S2. The effective mass obtained for each composition by fitting the oscillation amplitude with the Lifshitz-Kosevich formula, shows no significant change, suggesting that the topological phase might be relatively robust against enhanced SOC upon Se doping in Ni3In2S2 Copyright © 2025, The Authors. All rights reserved.

关键词： Single crystals

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Active tuning of plasmon damping via light induced magnetism

arXiv

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arXiv 2022年

作者： Cheng, Oscar Hsu-Cheng Zhao, Boqin Brawley, Zachary Son, Dong Hee Sheldon, Matthew Department of Chemistry Texas A&M University College Station TX United States Center for Nanomedicine Institute for Basic Science Graduate Program of Nano Biomedical Engineering Advanced Science Institute Yonsei University Seoul Korea Republic of Department of Material Science and Engineering Texas A&M University College Station TX United States

Circularly polarized optical excitation of plasmonic nanostructures causes coherent circulating motion of their electrons, which in turn, gives rise to strong optically induced magnetization— a phenomenon known as the inverse Faraday effect (IFE). In this study we report how the IFE also significantly decreases plasmon damping. By modulating the optical polarization state incident on achiral plasmonic nanostructures from linear to circular, we observe reversible increases of reflectance by 78% as well as simultaneous increases of optical field concentration by 35.7% under 109 W/m2 continuous wave (CW) optical excitation. These signatures of decreased plasmon damping were also monitored in the presence of an externally applied magnetic field (0.2 T). The combined interactions allow an estimate of the light-induced magnetization, which corresponds to an effective magnetic field of ~1.3 T during circularly polarized CW excitation (109 W/m2). We rationalize the observed decreases in plasmon damping in terms of the Lorentz forces acting on the circulating electron trajectories. Our results outline strategies for actively modulating intrinsic losses in the metal, and thereby, the optical mode quality and field concentration via opto-magnetic effects encoded in the polarization state of incident light. Copyright © 2022, The Authors. All rights reserved.

关键词： Damping

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Magnetochiral Tunneling in Paramagnetic Co1/3NbS2

arXiv

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arXiv 2024年

作者： Lim, Seongjoon Singh, Sobhit Huang, Fei-Ting Pan, Shangke Wang, Kefeng Kim, Jaewook Kim, Jinwoong Vanderbilt, David Cheong, Sang-Wook Rutgers Center for Emergent Materials Department of Physics and Astronomy PiscatawayNJ08854 United States Department of Mechanical Engineering University of Rochester RochesterNY14627 United States Materials Science Program University of Rochester RochesterNY14627 United States State Key Laboratory Base of Novel Function Materials and Preparation Science School of Material Sciences and Chemical Engineering Ningbo University Zhejiang Ningbo315211 China Department of Physics and Astronomy Rutgers University PiscatawayNJ08854 United States

Electric currents have the intriguing ability to induce magnetization in nonmagnetic crystals with sufficiently low crystallographic symmetry. Some associated phenomena include the non-linear anomalous Hall effect in polar crystals and the nonreciprocal directional dichroism in chiral crystals when magnetic fields are applied. In this work, we demonstrate that the same underlying physics is also manifested in the electronic tunneling process between the surface of a nonmagnetic chiral material and a magnetized scanning probe. In the paramagnetic but chiral metallic compound Co1/3NbS2, the magnetization induced by the tunneling current is shown to become detectable by its coupling to the magnetization of the tip itself. This results in a contrast across different chiral domains, achieving atomic-scale spatial resolution of structural chirality. To support the proposed mechanism, we used first-principles theory to compute the chirality-dependent current-induced magnetization and Berry curvature in the bulk of the material. Our demonstration of this magnetochiral tunneling effect opens up a new avenue for investigating atomic-scale variations in the local crystallographic symmetry and electronic structure across the structural domain boundaries of low-symmetry nonmagnetic crystals. © 2024, CC BY.

关键词： Magnetization

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High-Performance Silicon Anodes Enabled by Multifunctional Ultrafine Silica Nanoparticle-Embedded Carbon Coatings for Lithium-Ion Batteries

引用

Advanced Energy materials 2025年第0期

作者： Sun, Zhefei Yin, Quanzhi Zhou, Shenghui Chen, Haoyu Wen, Sifan Yang, Huiping Wu, Xiaoyu Pan, Jianhai Han, Jiajia Yang, Hui Zhuang, Zilong Feng, Shijie Zhang, Li Peng, Dong-Liang Zhang, Qiaobao State Key Laboratory of Physical Chemistry of Solid Surfaces College of Materials Xiamen University Xiamen361005 China State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical Engineering Tan Kah Kee Innovation Laboratory Collaborative Innovation Center of Chemistry for Energy Materials Xiamen University Fujian Xiamen361005 China State Key Laboratory of Material Processing and Die & Mould Technology Department of Mechanics School of Aerospace Engineering Huazhong University of Science and Technology Hubei Wuhan430074 China Department of Mechanical Engineering University of Wisconsin-Madison MadisonWI53706 United States Materials Science and Engineering Program University of California San Diego La JollaCA92093 United States Longmen Laboratory Henan Luoyang471023 China

Silicon (Si) holds immense promise as viable anode for next-generation high-energy-density Li-ion batteries (LIBs). However, its poor ionic/electronic conductivity and significant volumetric changes during cycling lead to rapidly deteriorated LIB performance. Here, a novel multifunctional coating featuring ultrafine SiO2 nanoparticles (2-C) to resolve these challenges is proposed. This unique uSiO2-C coating provides high-efficient electron and ion transport pathways, while also improves interfacial stability and mitigates volume changes during cycling, thereby enhancing the conductivity and structural integrity of Si@uSiO2-C, as corroborated by extensive experimental and computational studies. In addition, the abundant interfaces in uSiO2-C coating facilitate Li+ transport and the evenly distributed ultrafine SiO2 nanoparticles impart high electrochemical reactivity and mechanical robustness. Consequently, the Si@uSiO2-C anode achieves a high reversible capacity of 2093 mAh g−1 at 0.2 A g−1, with a high initial Coulombic efficiency of 88.3%, superior rate capability and durability (1000 cycles, 928 mAh g−1 at 1.0 A g−1, 75% capacity retention). Full cells paired with commercial LiFePO4 cathodes demonstrate high cyclability, maintaining 80% capacity retention over 500 cycles at 4 C. This work highlights the vital role of multifunctional coating in promoting the electrochemical performance of Si-based anodes for high-performance LIBs. © 2025 Wiley-VCH GmbH.

关键词： SiO2 nanoparticles

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Spintronic terahertz emission from Ni/Pt bilayer grown on MgO 10

Spintronic terahertz emission from Ni/Pt bilayer grown on Mg...

引用

10th International Seminar on New Paradigm and Innovation of Natural sciences and itsApplication, ISNPINSA 2020

作者： Ferrolino, J.P. Cabello, N.I. De Los Reyes, A. Mag-Usara, V.K. Afalla, J.P. Bardaloza, H. Verona, I.C. Talara, M. Kitahara, H. Somintac, A. Salvador, A. Tani, M. Estacio, E. Material Science and Engineering Program University of the Philippines Diliman Diliman Quezon City1101 Philippines National Institute of Physics College of Science University of the Philippines Diliman Diliman Quezon City1101 Philippines Research Center for Development of Far Infrared Region University of Fukui Bunkyo 3-9-1 Fukui City910-8507 Japan

Spintronic THz emission from Ni/Pt bilayer grown on MgO is reported based on the novel THz emitter using metallic structures. The Ni metal was deposited first on a MgO substrate and capped with a thin Pt metal via electron beam deposition. The THz emission data was obtained using a standard terahertz time-domain spectroscopy setup using a Ti: sapphire laser excitation source. Initial measurements were done using 800nm excitation with 7 mW and 185 mW pump powers under upward and downward magnetic field orientations. Polarity reversal of the terahertz signal was observed upon changing the orientation of the magnetic field. Maximum amplitude was found at 0.5 THz with bandwidth up to ∼6 THz. A saturation fluence of 85.04 mJ/cm2 was calculated from the pump fluence-dependence plot of the THz peak-to-peak signal. The results are consistent with the spintronic THz emission due to the inverse spin-Hall effect and provide insights for future development and optimizations. © Published under licence by IOP Publishing Ltd.

关键词： Magnesia

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Effects of numbers of wells on optical properties of periodic InGaN graded structure

Effects of numbers of wells on optical properties of periodi...

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Low-Dimensional materials and Devices 2021

作者： Sarollahi, Mirsaeid Allaparthi, Rohith Alhelais, Reem Aldawsari, Manal A. Refaei, Malak A. Maruf, Md Helal Uddin Ware, Morgan E. University of Arkansas Electrical Engineering Department 3217 Bell Engineering Center FayettevilleAR72701 United States University of Arkansas Microelectronics-Photonics Program 731 West Dickson Street FayettevilleAR72701 United States University of Arkansas Material Science and Engineering 731 West Dickson Street FayettevilleAR72701 United States Institute for Nanoscience and Engineering FayettevilleAR72701 United States

ISBN: (数字)9781510644397

ISBN: (纸本)9781510644380

The optical properties of periodic graded GaN/InGaN are studied. We have designed graded InGaN quantum well (QW) structures with the indium composition increasing then decreasing in a zigzag pattern. Through polarization doping, this naturally creates alternating p-type and n-type regions. Separate structures are designed by varying the number of repeating periods (1 to 3), while maintaining constant overall structure thicknesses. Calculation of the transition probabilities and the electron and hole wave-functions between the conduction band and the valence band reveals a complex energy structure which predicts the photoluminescence peaks for band to band transitions. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

关键词： Optical properties

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Dual template using P123-gelatin for synthesized large mesoporous silica for enhanced adsorption of dyes

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South African Journal of Chemical engineering 2023年 43卷 312-326页

作者： Safitri, Widiya Nur Habiddin, Habiddin Ulfa, Maria Trisunaryanti, Wega Bahruji, Hasliza Holilah, Holilah Rohmah, Alya Awinatul Sholeha, Novia Amalia Jalil, Aishah Abdul Santoso, Eko Prasetyoko, Didik Department of Chemistry Faculty of Science and Data Analytics Institut Teknologi Sepuluh Nopember East Java Keputih Sukolilo Surabaya 60111 Indonesia Chemistry Education Study Program Faculty of Teacher Training and Education Universitas Sebelas Maret Jl. Ir. Sutami 36A Surakarta 57126 Indonesia Department of Chemistry Faculty of Science Universitas Gadjah Mada Sekip Utara Sleman Indonesia Centre for Advanced Material and Energy Sciences Universiti Brunei Darussalam Bandar Seri Begawan BE 1410 Brunei Darussalam Research Center for Biomass and Bioproducts National Research and Innovation Agency of Indonesia (BRIN) Cibinong 16911 Indonesia Department of Food Science and Technology Faculty of Agriculture Halu Oleo University Indonesia College of Vocational Studies Bogor Agricultural University (IPB University) Jalan Kumbang No. 14 Bogor 16151 Indonesia Department of Chemical Engineering Faculty of Chemical and Energy Engineering Universiti Teknologi Malaysia 81310 UTM Johor Skudai Johor Bahru Malaysia

Mesoporous Silica with a large mesopore channel was synthesized using the sol-gel method for dye adsorption. A dual template consisting of P123 and gelatin at different ratios was employed in the sol-gel synthesis to enhance surface area and mesopore diameter. Gelatin is a green pore directing agent that strengthens P123 thermal stability during the calcination of silicate gel. Optimization of P123:gelatin ratio to 1:0.02 increased the surface area of mesoporous silica to 561.9 m²/g and expanded the pore diameter to 10 nm. The large pore diameter and surface area enhanced methylene blue adsorption capacity to 363.63 mg/g. The adsorption of methylene blue on mesoporous silica follows the pseudo second-order kinetic and the Langmuir model. Regeneration studies using thermal and chemical treatments exhibited the potential of mesoporous silica as an adsorbent for multiple adsorption-desorption of dyes. © 2022 The Author(s)

关键词： Dual template Dye Gelatin Mesoporous silica Pluronic P123

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