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IEEE Conference on Nanotechnology

作者： Evans Addo-Mensah Janet Obaemo Katie Welch Yang Tian Shiva Dolatabadi Hugh Churchill Uchechukwu Wejinya Materials Science and Engineering Graduate Program University of Arkansas Microelectronics and Photonics Program University of Arkansas Department of Physics University of Arkansas Fayetteville Arkansas Department of Mechanical Engineering University of Arkansas Fayetteville Arkansas

The advancement of graphene has created a need in exploring its properties for different applications. One way to explore its properties is by reducing its hydrophobicity. To overcome hydrophobicity of graphene, surfactants have been used in functionalization, hence improving the surface properties of the graphene monolayer. Therefore, investigating surfactant treatment for CVD graphene becomes useful in understanding the surface property effects on graphene. This study utilizes CVD graphene on silicon substrates. Its treatment was done with varying concentrations of Sodium Cholate (SC) for different treatment times. These samples were then characterized using Atomic Force Microscopy (AFM) to investigate the surface properties of the samples before and after treatment. To be optimized, the graphene must remain attached to the silicon substrate. The result shows that the integrity of the graphene, which is basically the Sp2 structure, is preserved as there was no delamination from the substrate even after treatment for as long as 2 hours in 1% weight/volume concentration of the SC solution.

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Coherent Acoustic Phonons in Bi2Se3 Ultrathin Films Probed by Femtosecond, Optical Pump-Probe Spectroscopy

Coherent Acoustic Phonons in Bi2Se3 Ultrathin Films Probed b...

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CLEO: Fundamental Science, CLEO:FS 2024 - Part of Conference on Lasers and Electro-Optics, CLEO 2024

作者： Cheng, Jing Niherysh, Kiryl A. Francis, Peter Chakraborty, Debamitra Lombardi, Floriana Erts, Donats Prischepa, Serghej L. Laszcz, Adam Komissarov, Ivan V. Sobolewski, Roman Materials Science Graduate Program University of Rochester RochesterNY14627 United States Laboratory for Laser Energetics University of Rochester RochesterNY14623-1299 United States Department of Microtechnology and Nanoscience Chalmers University of Technology Gothenburg Sweden Institute of Chemical Physics University of Latvia Riga Latvia Department of Electrical and Computer Engineering University of Rochester RochesterNY14627 United States Dipartimento di Fisica "E.R. Caianiello" Università degli Studi di Salerno Sa FiscianoI-84084 Italy Lukasiewicz Research Network Institute of Microelectronics and Photonics WarszawaPL-02668 Poland

ISBN: (纸本)9781957171395

The dynamics of coherent acoustic phonons in the Bi2Se3 layered crystal system are investigated. The findings reveal that the frequency evolution of breathing modes with the number of the material quintuple layers and the dispersion relation both can be explained by a modified chain model with a nonuniform coupling force. © Optica Publishing Group 2024, © 2024 The Author(s)

关键词： Ultrathin films

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Optomechanical dissipative solitons (vol 600, pg 75, 2021)

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NATURE 2022年第7896期602卷 E24-E24页

作者： Zhang, Jing Peng, Bo Kim, Seunghwi Monifi, Faraz Jiang, Xuefeng Li, Yihang Yu, Peng Liu, Lianqing Liu, Yu-xi Alu, Andrea Yang, Lan Department of Electrical and Systems Engineering Washington University St. Louis MO USA Department of Automation Tsinghua University Beijing P. R. China Photonics Initiative Advanced Science Research Center City University of New York New York NY USA Physics Program Graduate Center City University of New York New York NY USA State Key Laboratory of Robotics Shenyang Institute of Automation Chinese Academy of Sciences Shenyang P. R. China Institute of Microelectronics Tsinghua University Beijing P. R. China

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Exploring Convergence of Snake-Skin-Inspired Texture Designs and Additive Manufacturing for Mechanical Traction

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Procedia Manufacturing 2019年 34卷 640-646页

作者： Catherine Tiner Salil Bapat Subrata Deb Nath Sundar V. Atre Ajay Malshe Microelectronics-Photonics Graduate Program University of Arkansas Fayetteville AR 72701 USA Department of Mechanical Engineering University of Arkansas Fayetteville AR 72701 USA Materials Innovation Guild University of Louisville Louisville KY 40208 USA

This research explores the convergence of a 3D printing process with snake-skin-inspired textures for mechanical traction. The design attributes of snake skin scales were studied via the shed skin of species Python Regius . Snake skin design, especially on ventricular side, consists of hexagonal scale patterns with denticulations and fibrils as hierarchical structures of the design. The snake-skin-inspired design was then explored for printing using the laser-powder bed fusion (L-PBF) manufacturing technique on 420 stainless steel. It was discovered that the surface roughness generated by the laser scanning path during the 3D printing technique closely mimics the hierarchical micro-texture of snake skin scales. The texture of the 3D printed part surface was measured using the JIS B 06061-2001 standard by a laser scanning microscope and this manuscript presents a comparison of the 3D printed texture with the shed snake skin surface. This paper also discusses directional traction properties of the printed surface using tribological study.

关键词： Bio-inspired Design 3D Printing Surface Texture

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Anomalous, non-Gaussian, viscoelastic, and age-dependent dynamics of histonelike nucleoid-structuring proteins in live Escherichia coli

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Physical Review E 2018年第4期98卷 042411-042411页

作者： Asmaa A. Sadoon Yong Wang Department of Physics Microelectronics-Photonics Graduate Program Cell and Molecular Biology Program University of Arkansas Fayetteville Arkansas 72701 USA

We report our measurements of the dynamics of histonelike nucleoid-structuring (H-NS) proteins, which interact with both proteins and DNA simultaneously, in live Escherichia coli bacteria. The dynamics turn out to differ significantly from other molecules reported previously. A power-law distribution was observed for the diffusion coefficients of individual H-NS proteins. In addition, we observed a distribution of displacements which does not follow the Gaussian, Cauchy, or Laplace distributions but the Pearson Type VII distribution. Furthermore, we experimentally measured the time and frequency dependence of the complex modulus of the bacterial cytoplasm, which deviates from the viscoelasticity of homogeneous protein solutions and shows a glass-liquid transition. Last, we observed that the dynamics of H-NS proteins is cell length and cell age dependent. The findings are expected to fundamentally change the current views on bacterial cytoplasm and diffusional dynamics of molecules in bacteria.

关键词： Anomalous diffusion Viscoelasticity

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Mechanical-energy-based amplifiers for probing interactions of DNA with metal ions

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Physical Review E 2018年第6期98卷 062403-062403页

作者： Jack Freeland Prabhat Khadka Yong Wang Department of Physics Microelectronics-Photonics Graduate Program Cell and Molecular Biology Program University of Arkansas Fayetteville Arkansas 72701 USA

We report our development of a simple and cost-effective method to amplify and probe the interactions of DNA with metal ions, which are important for various fundamental processes in living systems. This method is based on perturbing energy landscapes using mechanical energy stored in bent DNA molecules. In this proof-of-principle study, the mechanical-energy-based amplifiers were applied to examine the interactions between DNA and Mg2+ ions or Ag+ ions. We demonstrated that interactions between DNA and Mg2+ or Ag+ ions, which are not detectable using gel electrophoresis without amplification, can be easily measured using our molecular amplifiers. In addition, we showed that quantitative details about the DNA-metal interactions can be estimated using our method. Our method is simple, sensitive, and cost-effective. We expect that the developed method will be useful for various applications.

关键词： Biomechanics DNA

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Growth and strain engineering of trigonal te for topological quantum phases in non-symmorphic chiral crystals

arXiv

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arXiv 2019年

作者： Basnet, Rabindra Doha, M. Hasan Hironaka, Takayuki Pandey, Krishna Davari, Shiva Welch, Katie M. Churchill, Hugh O. H. Hu, Jin Department of Physics University of Arkansas Fayetteville72701 United States Institute for Nanoscience and Engineering University of Arkansas Fayetteville72701 United States Microelectronics-Photonics Graduate Program University of Arkansas Fayetteville72701 United States

Strained trigonal Te has been predicted to host Weyl nodes supported by a nonsymmorphic chiral symmetry. Using low-pressure physical vapor deposition, we systematically explored the growth of trigonal Te nanowires with naturally occurring strain caused by curvature of the wires. Raman spectra and high mobility electronic transport attest to the highly crystalline nature of the wires. Comparison of Raman spectra for both straight and curved nanowires indicates a breathing mode that is significantly broader and shifted in frequency for the curved wires. Strain induced by curvature during growth therefore may provide a simple pathway to investigate topological phases in trigonal Te. Copyright © 2019, The Authors. All rights reserved.

关键词： Nanowires

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Optical and Atomic Force Microscopy Study of Non-covalently functionalized CVD Graphene

Optical and Atomic Force Microscopy Study of Non-covalently ...

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IEEE International Conference on Nano/Micro Engineered and Molecular Systems

作者： Abayomi Omolewu Guangyi Shi Tian Ryan Xiangbo Meng Uchechukwu Wejinya Microelectronics-Photonics Graduate Program University of Arkansas Fayetteville Arkansas USA Scics Peking University at Wuxi Wuxi China Chemistry and Biochemistry Department University of Arkansas Fayetteville Arkansas USA Department of Mechanical Engineering University of Arkansas Fayetteville Arkansas USA

Chemical functionalization is a method that is being explored to take advantage of the intriguing properties of graphene and its derivatives. Surfactant treatments have been successfully employed to non-covalently functionalize graphitic materials such as carbon nanotube and graphite. However, there is still need to investigate the surfactant treatment approach for commercially available chemical vapor deposited (CVD) graphene on silicon-silicon dioxide substrate. CVD graphene is one of the large-scale graphene available;hence, it is essential to understand how surfactants interact with it. This work presents the optical and atomic force microscopy study of non-covalently-functionalized graphene using Sodium Dodecyl Sulphate. CVD graphene on silicon/silicon dioxide (Si/SiO_2) substrates were treated with different surfactant concentrations for different times. Unlike other derivatives of graphene, like carbon nanotube and graphite where the delamination of graphene sheet from the substrate is not a major concern, results show that the stability of the CVD graphene on the substrate is highly dependent on the concentration of the surfactant used for modifying the surface of the graphene, and the duration of treatment. Higher concentration of surfactant treatment was achieved by dissolving the surfactant with water and isopropyl alcohol. The result also suggests that different concentrations of surfactant affect the surface roughness of the functionalized graphene.

关键词： Graphene Surfactants Substrates Delamination Nanoparticles Zinc oxide

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AFM based Topography Characterization of Smooth, Nanotextured, and Microtextured Surfaces

AFM based Topography Characterization of Smooth, Nanotexture...

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IEEE International Conference on Micro/Nano Sensors for AI, Healthcare, and Robotics

作者： Uchechukwu C. Wejinya Guangyi Shi Abayomi Omolewu Department of Mechanical Engineering University of Arkansas Peking University Shenzhen Graduate School Microelectronics-Photonics Graduate Program University of Arkansas

ISBN: (纸本)9781538694091;9781538694084

Surface topography is important to the function of many kinds of industrial products and is constantly growing with the increase advancement of technology. It is important to understand surface topography measurement and how to control it effectively. Surface roughness is an important parameter of topography characterization and is quantified by the vertical deviations of a real surface from its ideal form. Therefore, depending on the application it may be desirable to have either a rough surface or a very smooth surface. Rough surfaces can be desirable for cell adhesion and plays a great role in biological or biomedical application. Smooth surfaces can be desirable in applications where there are two interacting surfaces and minimal wear between the two is needed. This work addresses the surface topography characterizing of a smooth, nanotextured, and microtextured surface.

关键词： Rough surfaces Surface roughness Surface topography Surface texture Surface treatment Response surface methodology

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Thermodynamic and Thermoelectric properties of CoFeYGe (Y= Ti, Cr) quaternary Heusler alloys: First principle calculations

arXiv

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arXiv 2019年

作者： Haleoot, Raad Hamad, Bothina Microelectronics and Photonics graduate program University of Arkansas FayettevilleAR72701 United States Department of Physics College of Education University of Mustansiriyah Baghdad10052 Iraq Department of Physics University of Arkansas FayettevilleAR72701 United States Physics Department University of Jordan Amman11942 Jordan

Utilizing a material in thermoelectric applications requires a mechanical, thermal, and lattice stability as well a high figure of merit (ZT). In this work, we present the structural, electronic, magnetic, mechanical, thermodynamic, dynamic, and thermoelectric properties of CoFeYGe (Y = Ti, Cr) quaternary Heusler compounds using the density functional theory (DFT). The calculated mechanical properties and phonon dispersions reveal that the structures of these compounds are stable. Both CoFeCrGe and CoFeTiGe compounds show a ferromagnetic and ferrimagnetic half-metallic behavior with band gaps of 0.41 and 0.38 eV, respectively. The lattice thermal conductivity (κL) exhibits low values that reach 3.01 W/(m.K) (3.47 W/(m.K)) for CoFeCrGe (CoFeTiGe) at 1100 K. The optical phonon modes have a large contribution of 60.2% (70.9 %) to κL value for CoFeCrGe (CoFeTiGe). High ZT values of 0.71 and 0.65 were obtained for CoFeCrGe and CoFeTiGe, respectively. Based on our calculations, CoFeCrGe and CoFeTiGe combine both good spintronic and thermoelectric behaviors that may be used in spin injection applications. Copyright © 2019, The Authors. All rights reserved.

关键词： Density functional theory

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