检索结果-内蒙古大学图书馆

arXiv 2024年

作者： Austin-Bingamon, Noah Binod, D.C. Miyahara, Yoichi Materials Science Engineering and Commericialization program Texas State University San MarcosTX78640 United States Department of Physics Texas State University San MarcosTX78640 United States

Quality factor plays a fundamental role in dynamic mode atomic force microscopy. We present a technique to modify the quality factor of an atomic force microscopy cantilever within a Fabry-Pérot optical interferometer. The experimental setup uses two separate laser sources to detect and excite the oscillation of the cantilever. While the intensity modulation of the excitation laser drives the oscillation of the cantilever, the average intensity can be used to modify the quality factor via optomechanical force, without changing the fiber-cantilever cavity length. The technique enables users to optimize the quality factor for different types of measurements without influencing the deflection measurement sensitivity. An unexpected frequency shift was also observed and modelled as temperature dependence of the cantilever’s Young’s modulus, which was validated using finite element simulation. The model was used to compensate for the thermal frequency shift. The simulation provided relations between optical power, temperature, and frequency shift. Copyright © 2024, The Authors. All rights reserved.

关键词： Temperature distribution

来源：评论

学校读者我要写书评

暂无评论

Polyetheretherketone (PEEK) Implant Functionalization with Magnetron-Sputtered SrTiO3 for Regenerative Medicine

引用

Plasma Medicine 2023年第3期13卷 53-67页

作者： Harumningtyas, Anjar Anggraini Ito, Tomoko Ikuta, Masato Kaito, Takashi Hamaguchi, Satoshi International Priority Graduate Program on Applied and Engineering Physics Division of Precision Engineering and Applied Physics Osaka University Osaka Japan Yogyakarta Indonesia Division of Materials and Manufacturing Science Graduate School of Engineering Osaka University Osaka Japan Department of Orthopaedic Surgery Osaka University Graduate School of Medicine Osaka Japan

Polyetheretherketone (PEEK) is a polymer widely used for artificial bone implants but exhibits a low affinity for bone tissue and lacks osteoconductivity and osseointegration. Because strontium (Sr) is known to enhance bone growth, PEEK implants coated with strontium titanate [SrTiO3 (STO)] are expected to improve the bone growth around them. In this study, STO was deposited on model PEEK implants by magnetron sputtering deposition and its ability to release Sr2+ ions to a surrounding phosphate-buffered saline (PBS) solution was examined. It was found that, in the early stage of the deposition process, STO on a PEEK surface exhibits irregular surface structures with many holes. The amount of Sr stored in the STO film increases with the increasing film thickness but the release rate of Sr2+ ions from the STO film to the surrounding PBS also increases with the film thickness, limiting the duration of effectiveness of the STO-coated PEEK films. It was found, however, that a three-layer titanium (Ti)-STO-Ti film deposited on PEEK allows a steady release of Sr2+ ions to the surrounding PBS for an extended period. © 2023 by Begell House, Inc. ***.

关键词： Titanium compounds

来源：评论

学校读者我要写书评

暂无评论

Unavoidable multilevel biaxial symmetry breaking in chiral hybrid liquid crystals

引用

Physical Review E 2025年第4期111卷 045410-045410页

作者： Jin-Sheng Wu Marina Torres Lázaro Souvik Ghosh Haridas Mundoor Henricus H. Wensink Ivan I. Smalyukh Department of Physics and Chemical Physics Program University of Colorado Boulder Colorado 80309 USA Laboratoire de Physique des Solides–UMR 8502 Université Paris-Saclay and CNRS 91405 Orsay France International Institute for Sustainability with Knotted Chiral Meta Matter Hiroshima University Higashihiroshima Japan Department of Electrical Computer and Energy Engineering Materials Science and Engineering Program and Soft Materials Research Center University of Colorado Boulder Colorado 80309 USA Renewable and Sustainable Energy Institute National Renewable Energy Laboratory and University of Colorado Boulder Colorado 80309 USA

Chiral nematic or cholesteric liquid crystals (LCs) are fluid mesophases with long-ranged orientational order featuring a quasilayered periodicity imparted by a helical director configuration but lacking long-range positional order. Doping molecular cholesteric LCs with strongly anisotropic uniaxial colloidal particles adds another level of complexity because of the interplay between weak surface-anchoring boundary conditions and bulk-based elastic distortions near the particle-LC interface. Using cylindrical colloidal disks and rods with different geometric shapes and surface conditions, we demonstrate that these colloidal inclusions generically exhibit biaxial orientational probability distributions which may impart anomalously strong local biaxiality onto the hybrid cholesteric LC structure. Unlike nonchiral hybrid molecular-colloidal LCs, where biaxial order emerges only at critical colloid volume fractions exceeding some uniaxial-biaxial transition value, the orientational probability of the colloidal inclusions immersed in chiral nematic hosts is unambiguously biaxial even at infinite dilution. We demonstrate that the colloids induce local biaxial perturbations within the molecular orientational order of the LC host medium which strongly enhances the weak but native biaxial order of chiral nematic LC induced by the chiral symmetry breaking of the director field. With the help of analytical modeling and computer simulations based on the Landau–de Gennes free energy of the host LC around the colloids, we rationalize the observed multilevel biaxial order and conclude that it is not only unavoidable but also strongly enhanced compared to both achiral hybrid LCs and purely molecular cholesteric LCs.

关键词： Cholesteric liquid crystals

来源：评论

学校读者我要写书评

暂无评论

Development of Flame Retardant Property on Sodium Silicate Treated Paper Based materials 21

Development of Flame Retardant Property on Sodium Silicate T...

引用

21st International Union of materials Research Societies International Conference in Asia, IUMRS-ICA 2021

作者： Suttipintu, Thitiporn Lhosupasirirat, Siraprapa Osotchan, Tanakorn Srikhirin, Toemsak Materials Science and Engineering Program School of Materials Science and Innovation Faculty of Science Mahidol University Bangkok10400 Thailand Research Network of NANOTEC Mahidol University National Nanotechnology Center Thailand Department of Physics Faculty of Science Mahidol University 272 Rama VI Road Ratchathewi District Bangkok10400 Thailand

The preparation of cellulose-based flame retardant paper treated with sodium silicate and silicon dioxide (SiO2) colloidal particle by simple immersion process is reported. Cellulose-based paper was preheated at 90°C for surface preparation. The heat treated paper was immersed in solution of sodium silicate-SiO2 at different immersion time ranging from 15 min to 24 hrs. Treated solution diffused into paper coated on the paper fiber and filled the void in the paper microstructure. Treated paper was heated at 90°C to convert an impregnated sodium silicate-SiO2 precursor into silicate framework. The treated paper showed Vsym Si-O-Si from siloxane bond at 792 cm-1 which confirmed a presence of SiO2 in paper. Treated paper at 1 hr immersion showed the highest weight percent gain (WPG) of 40% and total combustion time was improved to 14 sec. © Published under licence by IOP Publishing Ltd.

关键词： Silica

来源：评论

学校读者我要写书评

暂无评论

Detailed dynamics of a moving magnetic skyrmion lattice in MnSi observed using small-angle neutron scattering under an alternating electric current flow

引用

Physical Review B 2024年第1期110卷 014431-014431页

作者： D. Okuyama M. Bleuel Q. Ye J. Krzywon N. Nagaosa A. Kikkawa Y. Taguchi Y. Tokura J. D. Reim Y. Nambu T. J. Sato Institute of Multidisciplinary Research for Advanced Materials (IMRAM) Institute of Materials Structure Science (IMSS) National Institute of Standards and Technology 100 Bureau Drive Gaithersburg Maryland 20899-8562 USA Department of Materials Science and Engineering (CEMS) Wako 351-0198 Japan Fundamental Quantum Science Program TRIP Headquarters RIKEN Wako 351-0198 Japan Tokyo College and Department of Applied Physics (IMR) Organization for Advanced Studies FOREST

Lattice formation of swirling textures is ubiquitous in solid-state materials, such as a magnetic skyrmion lattice in chiral magnets. In the magnetic skyrmion lattices, their moving states and dynamics under external perturbations are still unrevealed, although a detailed understanding of the dynamics is crucial to realizing spintronic applications, such as magnetic domain-wall racetrack memory [Parkin et al., Science 320, 190 (2008); Fert et al., Nat. Nanotechnol. 8, 152 (2013)]. Here, we report in detail on the transient state of a moving magnetic skyrmion lattice in bulk single-crystalline MnSi under alternating current (AC) using small-angle neutron scattering. A rotation and concomitant broadening of the spot width in the azimuthal direction of the magnetic skyrmion reflections originating from the plastic deformation of the magnetic skyrmion lattice were found only at low AC frequencies [Okuyama et al., Commun. Phys. 2, 79 (2019)], whereas above the threshold AC frequency (ft∼0.12Hz) the rotation was not observed, and the spot width becomes sharper. The observed complex response of the magnetic skyrmion reflections can be explained by the change in dislocation density in the magnetic skyrmion lattice. At frequencies higher than ft, the magnetic skyrmions oscillate removing the dislocations, indicating that the dislocation density is controlled by the AC frequency.

关键词： Magnetic texture Topological defects Chiral magnets Neutron diffraction

来源：评论

学校读者我要写书评

暂无评论

Field-controlled dynamics of skyrmions and monopoles

arXiv

引用

arXiv 2023年

作者： Tai, Jung-Shen B. Hess, Andrew J. Wu, Jin-Sheng Smalyukh, Ivan I. Department of Physics Chemical Physics Program University of Colorado BoulderCO80309 United States Department of Electrical Computer and Energy Engineering Materials Science and Engineering Program Soft Materials Research Center University of Colorado BoulderCO80309 United States Renewable and Sustainable Energy Institute National Renewable Energy Laboratory University of Colorado BoulderCO80309 United States

Magnetic monopoles, despite their ongoing experimental search as elementary particles, have inspired the discovery of analogous excitations in condensed matter systems. In chiral condensed matter systems, emergent monopoles are responsible for the onset of transitions between topologically distinct states and phases, like in the case of transitions from helical and conical phase to A-phase comprising periodic arrays of skyrmions. By combining numerical modeling and optical characterizations, we describe how different geometrical configurations of skyrmions terminating at monopoles can be realized in liquid crystals and liquid crystal ferromagnets. We demonstrate how such complex structures can be effectively manipulated by external magnetic and electric fields. Furthermore, we discuss how our findings may hint at similar dynamics in other physical systems, and their potential applications. © 2023, CC BY.

关键词： Liquid crystals

来源：评论

学校读者我要写书评

暂无评论

X-photon 3D lithography by fs-oscillators:wavelength-independent and photoinitiator-free

引用

Light(Advanced Manufacturing) 2024年第4期5卷 89-101页

作者： Dimitra Ladika Antanas Butkus Vasileia Melissinaki Edvinas Skliutas Elmina Kabouraki Saulius Juodkazis Maria Farsari Mangirdas Malinauskas Institute of Electronic Structure and Laser Foundation for Research and Technology-Hellas70013 HeraklionGreece Department of Materials Science and Technology University of Crete70013HeraklionCrete Laser Research Center Faculty of PhysicsVilnius UniversitySaulėtekio Ave.10LT-10223 VilniusLithuania Optical Sciences Centre and ARC Training Centre in Surface Engineering for Advanced Materials(SEAM) School of ScienceSwinburne University of TechnologyMelbourneAustralia WRH Program International Research Frontiers Initiative(IRFI)Tokyo Institute of Technology Nagatsuta-choMidori-kuYokohamaJapan

Laser direct writing employing multi-photon 3D polymerisation is a scientific and industrial tool used in various fields such as micro-optics,medicine,metamaterials,programmable materials,etc.,due to the fusion of highthroughput and fine features down to hundreds of *** limitations of technology applicability emerge from photo-resin properties,however any material modifications can strongly affect its printability,as photoexcitation conditions alter as *** we present wavelength-independent 3D polymerisation using low peak power laser *** pulse repetition rate and fast laser direct writing was employed for advancing additive manufacturing out of the SZ2080^(TM)photo-resist without any *** of 517 nm,780 nm,and 1035 nm are shown to be suitable for producing 300 nm polymerized features even at high-up to 10^(5)μm/s-writing *** of organic-inorganic ratio in hybrid material results in shift and decrease of the dynamic fabrication window,yet not prohibiting the *** energy deposition per focal volume is achieved due to localized heating enabling efficient 3D *** spatio-selective photo-chemical crosslinking widens optical manufacturing capacity of non-photo-sensitive materials.

关键词： 3D polymerisation Nonlinear absorption Multi-photon absorption Laser direct writing Additive manufacturing Material engineering Organic-inorganic polymers SZ2080^(TM) Photosensitizer

来源：评论

学校读者我要写书评

暂无评论

Measurement of Water Diffusion Coefficient in Cross-Linked Gelatins Using the Terahertz Time-Domain Spectroscopy Technique

Measurement of Water Diffusion Coefficient in Cross-Linked G...

引用

2024 Conference on Lasers and Electro-Optics, CLEO 2024

作者： Walden, D. Chakraborty, D. Cheng, J. Straksys, A. Stirke, A. Melo, W.C.M.A. Jukna, A. Komissarov, I. Sobolewski, Roman Department of Physics and Astronomy University of Rochester RochesterNY14627 United States Laboratory for Laser Energetics University of Rochester RochesterNY14623-1299 United States Materials Science Graduate Program University of Rochester RochesterNY14627 United States State Research Institute Center for Physical Sciences & Technology Vilnius Lithuania Department of Physics Vilnius Gediminas Technical University Vilnius Lithuania Department of Electrical and Computer Engineering University of Rochester RochesterNY14627 United States

A novel method has been developed to evaluate the water diffusion dynamics in gelatin-based gels, based on transient terahertz time-domain spectroscopy measurements. Such gels are widely used models for human skin. &#... 详细信息

ISBN: (纸本)9781957171395

关键词： Transient analysis

来源：评论

学校读者我要写书评

暂无评论

Measurement of Water Diffusion Coefficient in Cross-Linked Gelatins Using the Terahertz Time-Domain Spectroscopy Technique

Measurement of Water Diffusion Coefficient in Cross-Linked G...

引用

CLEO: Applications and Technology in CLEO 2024, CLEO: A and T 2024 - Part of Conference on Lasers and Electro-Optics

关键词： Terahertz spectroscopy

来源：评论

学校读者我要写书评

暂无评论

Editorial for advanced energy storage and conversion materials and technologies

引用

Rare Metals 2020年第9期39卷 967-969页

作者： Jian-Min Ma Yu-Tao Li School of Physics and Electronics Hunan UniversityChangsha 410082China Materials Science and Engineering Program and Texas Materials Institute The University of Texas at AustinAustinTX 78712USA

Energy storage and conversion technologies have attracted increasing attention from academic and industrial communities due to the large demands from wide-ranging *** and developing high-performance electrode materials are cruciual to improve the performance of energy storage and conversion *** present,various energy storage and conversion devices,i.e.,potassium-ion batteries(PIBs).

关键词： energy potassium electrode

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：