Synthesis Of Novel Coo/Mnfe2o4 Heterostructured Nanoparticles And The Effects Of Variable Size And Extent Of Overgrowth On Their Magnetic Properties,
2020
Missouri State University
Synthesis Of Novel Coo/Mnfe2o4 Heterostructured Nanoparticles And The Effects Of Variable Size And Extent Of Overgrowth On Their Magnetic Properties, Mohammad Tauhidul Islam
Graduate Theses/Dissertations
A combination of thermal decomposition and surfactant-assisted synthesis route was utilized to synthesize novel CoO/MnFe2O4 heterostructured nanoparticles. Four samples of varying CoO core size were synthesized with variable extent of overgrowth phase. XRD, XPS, SEM and TEM data show evidence of MnFe2O4 spinel phase overgrowth on CoO rock-salt structured nanoparticles. XPS and magnetic data reveal partial oxidation and formation of Co3O4 phase on 7 nm and 19 nm size CoO-based nanoparticles. The remaining samples having 22 nm and 34 nm dimensions show a higher percentage of FiM materials overgrowth on the …
Kinetic Monte Carlo Investigations Involving Atomic Layer Deposition Of Metal-Oxide Thinfilms,
2020
Missouri State University
Kinetic Monte Carlo Investigations Involving Atomic Layer Deposition Of Metal-Oxide Thinfilms, David Tyler Magness
Graduate Theses/Dissertations
Atomic Layer Deposition is a method of manufacturing thin film materials. Metal-oxides such as zinc-oxide and aluminum-oxide are particularly interesting candidates for use in microelectronic devices such as tunnel junction barriers, transistors, Schottky diodes, and more. By adopting a 3D Kinetic Monte Carlo model capable of simulating ZnO deposition, the effect of parameters including deposition temperature, chamber pressure, and composition of the initial substrate at the beginning of deposition can be investigated. This code generates two random numbers: One is used to select a chemical reaction to occur from a list of all possible reactions and the second is used …
Optical Properties Of Ultrathin In(Ga)As/Gaas And In(Ga)N/Gan Quantum Wells,
2020
University of Arkansas, Fayetteville
Optical Properties Of Ultrathin In(Ga)As/Gaas And In(Ga)N/Gan Quantum Wells, Yurii Maidaniuk
Graduate Theses and Dissertations
Recently, structures based on ultrathin quantum wells (QWs) began to play a critical role in modern devices, such as lasers, solar cells, infrared photodetectors, and light-emitting diodes. However, due to the lack of understanding of the formation mechanism of ultrathin QWs during the capping process, scientists and engineers cannot fully explore the potential of such structures. This study aims to investigate how structural parameters of ultrathin QWs affect their emission properties by conducting a systematic analysis of the optical properties of In(Ga)As/GaAs and In(Ga)N/GaN ultrathin QWs. Specifically, the analysis involved photoluminescence measurements combined with effective bandgap simulation, x-ray diffraction, and …
Sustainable Drug Release
From Polycaprolactone Coated
Chitin‑Lignin Gel Fibrous Scaffolds,
2020
King Abdulaziz University
Sustainable Drug Release From Polycaprolactone Coated Chitin‑Lignin Gel Fibrous Scaffolds, Turdimuhammad Abdullah, Kalamegam Gauthaman, Azadeh Mostafavi, Ahmed Alshahrie, Numan Salah, Pierfrancesco Morganti, Angelo Chianese, Ali Tamayol, Adnan Memic
Department of Mechanical and Materials Engineering: Faculty Publications
Non-healing wounds have placed an enormous stress on both patients and healthcare systems worldwide. Severe complications induced by these wounds can lead to limb amputation or even death and urgently require more effective treatments. Electrospun scaffolds have great potential for improving wound healing treatments by providing controlled drug delivery. Previously, we developed fibrous scaffolds from complex carbohydrate polymers [i.e. chitin-lignin (CL) gels]. However, their application was limited by solubility and undesirable burst drug release. Here, a coaxial electrospinning is applied to encapsulate the CL gels with polycaprolactone (PCL). Presence of a PCL shell layer thus provides longer shelf-life for the …
Editorial: Carbon- And Inorganic-Based Nanostructures For Energy Applications,
2020
The University of Texas Rio Grande Valley
Editorial: Carbon- And Inorganic-Based Nanostructures For Energy Applications, Federico Cesano, M. Jasim Uddin, Yuanbing Mao, Muhammad N. Huda
School of Integrative Biological & Chemical Sciences (Formerly Dept. of Chemistry)
No abstract provided.
Data Analysis To Evaluate The Performance Of Breathing Masks Used For Filtering Nano-Level Particles At Manufacturing Sites,
2020
Georgia Southern University
Data Analysis To Evaluate The Performance Of Breathing Masks Used For Filtering Nano-Level Particles At Manufacturing Sites, Gracia M. Dardano
Honors College Theses
The work performed in this research aims to evaluate the performance of commercially available breathing masks in filtering airborne nanoparticles at manufacturing sites. Nanoparticles are found virtually anywhere, from dust in a worksite to a simple sneeze. Therefore, they pose a substantial threat to human health as their velocity and volatility are high. This research analyzes if current efforts of breathing masks to hinder nanoparticles are effective, especially at manufacturing sites. Data has been collected in order to analyze the behavior of nanoparticles and to measure nanoparticle levels at manufacturing sites and its working environment. Data is statistical in nature …
Radial Basis Densities And The Density Functional-Based Atom-In-Molecule: Designing Charge-Transfer Potentials,
2020
University of New Mexico - Main Campus
Radial Basis Densities And The Density Functional-Based Atom-In-Molecule: Designing Charge-Transfer Potentials, Godwin Amo-Kwao
Nanoscience and Microsystems ETDs
Classical potentials that are capable of describing charge transfer and charge polarization in complex systems are of central importance for classical atomistic simulation of biomolecules and materials. Current potentials—regardless of the system—do not generalize well, and, with the exception of highly-specialized empirical potentials tuned for specific systems, cannot describe chemical bond formation and breaking. The charge-transfer embedded atom method (CT-EAM), a formal, DFT-based extension to the original EAM for metals, has been developed to address these issues by modeling charge distortion and charge transfer in interacting systems using pseudoatom building blocks instead of the electron densities of isolated atoms. CT-EAM …
Gan Nanowire Laser For A Universal Atomic Force Microscope Probe: A Computational And Feasibility Study,
2020
University of New Mexico - Main Campus
Gan Nanowire Laser For A Universal Atomic Force Microscope Probe: A Computational And Feasibility Study, Neal Wostbrock
Nanoscience and Microsystems ETDs
This thesis attempts to establish the groundwork for integrating a GaN nanowire into an AFM probe resulting in a universal atomic force microscope probe. Previous studies have shown GaN nanowires have stable mechanical properties, can be fabricated at scale with high aspect ratios and very smooth side walls, and have intrinsic lasing capabilities; however, mechanical and lasing capabilities have not yet been integrated into a single AFM probe. Here, we develop and analyze a suspended waveguide optical pumping concept that can be fabricated and applied to an AFM probe cantilever, unlocking full potential of GaN’s optical and mechanical properties as …
Anisotropic Cuinse2 Nanocrystals: Synthesis, Optical Properties And Their Effect On Photoelectric Response Of Dye-Sensitized Solar Cell,
2020
The British University in Egypt
Anisotropic Cuinse2 Nanocrystals: Synthesis, Optical Properties And Their Effect On Photoelectric Response Of Dye-Sensitized Solar Cell, Ahmed Mysara, M Mohsen Abdelaziz, A N. Emam, A S. Mansour, A A. F. Zikry, M .B Mohamed, Y H. Elbashar
Nanotechnology Research Centre
CuInSe2 I-III-VI2 ternary is a semiconductor considered very good efficient solar energy conversion material. An organometallic pyrolysis method is used to prepare monodisperse CuInSe2 nanoparticles using a mixture of oleylamine, and trioctylphosphine, as capping materials. The particle shape changes to dot, rods or flowers occur via varying the reaction temperatures (160, 200, 220±C) respectively. The obtained particles have been characterized to determine the shape and size of CuInSe2 nanoparticles using HR-TEM and XRD. The optical and electronic properties of these particles have been investigated and discussed in detail. Then the different shapes of CuInSe …
Mitigation Of Electromigration In Metal Interconnects Passivated By Ångstrom-Thin 2d Materials,
2020
University of South Florida
Mitigation Of Electromigration In Metal Interconnects Passivated By Ångstrom-Thin 2d Materials, Yunjo Jeong
USF Tampa Graduate Theses and Dissertations
Electromigration in metal interconnects remains one of the most prominent challenges in the state-of-the-art semiconductor industry. A phenomenon defined as the momentum transfer from electrons in an electric current to the metal atoms in a conductor, electromigration creates voids and hillocks that ultimately cause failures in nanoelectronics due to short or open circuits. Additionally, electromigration induces undesirable diffusion of metal atoms into the dielectric material, forcing the need for a barrier material that can mitigate such adverse effects of the phenomenon. However, extremely tight dimensional control of modern transistor designs imposes reduced dimensions of the interconnects in order to accommodate …
Honokiol Loaded Mpeg-Pcl Micelles For The Treatment Of Age-Related Macular Degeneration,
2020
University of South Florida
Honokiol Loaded Mpeg-Pcl Micelles For The Treatment Of Age-Related Macular Degeneration, Amna Shahid
USF Tampa Graduate Theses and Dissertations
Age related Macular Degeneration (AMD), a multi-factorial age-related retinal hypoxic disorder resulting in irreversible loss of vision is the foremost cause of blindness in United States. Current treatment strategies used to treat disease involve multiple intraocular injections of Anti – VEGF agents into the vitreous of eye. In addition to the issues of drug localization and targeted delivery, the need to frequently inject drug into the eye raise patient compliance issues. These challenges call for sustained drug delivery system. In this study, a sustained drug delivery system was prepared by loading an anti- HIF agent, honokiol into MPEG-PCL polymer. These …
Modulating Mechanical Properties Of Polymer Composites Via Colloidal Particle Reinforcement,
2020
Louisiana State University and Agricultural and Mechanical College
Modulating Mechanical Properties Of Polymer Composites Via Colloidal Particle Reinforcement, Yusheng Guo
LSU Master's Theses
Additive manufacturing allows the rapid process of complex objects with excellent design flexibility. However, the products often exhibit poor mechanical properties when pure polymer is applied as printable material. In this work, we demonstrate that printability of polymer can be dramatically improved when particle filler is added to form reinforced polymer composites. Furthermore, the interaction between filler and polymer matrix leads to the enhancement in mechanical properties of the printed product. The material reinforcement induced by addition of fillers enables the wide application of polymer composites to print structures with unique features. In the printing of silica-reinforced pNIPAM composite, we …
Electrochemical Engineering Of Carbon Nanodots,
2020
1. School of Engineering, RMIT University, Melbourne, 3001, Australia;
Electrochemical Engineering Of Carbon Nanodots, Lei Bao, Dai-Wen Pang
Journal of Electrochemistry
Aqueous batteries have been considered to be a competitive candidate for large-scale energy storage. However, most of aqueous batteries adopt inorganic electrode materials with metallic elements, which are based on the reversible insertion of metal ions, making their application being highly hindered by limited cycle life, environmental issue, high cost and low reserves. On the other hand, organic electrode materials offer the advantages of abundant reserves, tunable structures, renewability and environmental benignity. Furthermore, the wide internal space enables these organics to flexibly store various charge carriers. Organics have been investigated as the alternative to inorganic electrode materials. Herein, we review …
Cycling Performance And Solid-Electrolyte-Interphase Synergic Formation Of Silicon Nanoparticles In The Concentrated Electrolyte With Additives,
2020
1. National Power Battery Innovation Center , GRINM Group Corporation Limited, Beijing 100088, China;2. China Automotive Battery Research Institute Co., Ltd., Beijing 100088, China;
Cycling Performance And Solid-Electrolyte-Interphase Synergic Formation Of Silicon Nanoparticles In The Concentrated Electrolyte With Additives, Zeng-Hua Chang, Fu-Juan Han, Xi-Xin Yang, Jian-Tao Wang, Shi-Gang Lu
Journal of Electrochemistry
In this paper, the effects of additives on the cycling performance of silicon nanoparticles in LiFSI-(PC)3 based concentrated electrolytes were systematically studied. The structures of silicon nanoparticle electrodes and the evolution of solid-electrolyte-interphase were characterized by scanning electron microscopy (SEM), attenuated total reflection Flourier transformed infrared spectroscopy (ATR-FTIR) and X-ray photoelectron spectroscopy (XPS). The results indicated that the additives can efficiently improve the cycling performance of silicon nanoparticle electrodes. In LiFSI-(PC)3 concentrated electrolyte, the capacity became 574.8 mAh·g-1 after 300 cycles with the initial capacity of 3296.1 mAh·g-1. In contrast, the 3% LiDFOB, 3% FEC …
Fundamentals Of Distribution Of Relaxation Times For Electrochemical Impedance Spectroscopy,
2020
1. Institute for Sustainable Energy, Shanghai University, Shanghai 200444, China;2. Xi’an Key Laboratory of Clean Energy, Xi’an University of Architecture and Technology,Xi’an 710055, China;
Fundamentals Of Distribution Of Relaxation Times For Electrochemical Impedance Spectroscopy, Jia Wang, Qiu-An Huang, Wei-Heng Li, Juan Wang, Quan-Chao Zhuang, Jiu-Jun Zhang
Journal of Electrochemistry
Electrochemical impedance spectroscopy (EIS) is a powerful electrochemical characterization technology, which has been widely used in the field of electrochemical energy, such as lithium-ion batteries, supercapacitors, fuel cells, etc. Distribution of relaxation time (DRT) is an EIS deconvolution technique which does not depend on the prior knowledge of the targeted research object. Furthermore, DRT can serve to separate and analyze physical and chemical processes which are highly overlapped in their EIS data. In order to encourage the application and popularization of DRT deconvolution technology, several core questions are addressed in this paper: (1) DRT deconvolution principle, implementation steps and important …
Plasmon-Induced Color And Photochemistry,
2020
University of New Mexico
Plasmon-Induced Color And Photochemistry, Paul J. Gieri
Nanoscience and Microsystems ETDs
In recent decades, metallic nanostructures have been extensively studied for a variety of applications due to the ability to support surface plasmons. These excitations, which consist of collective resonant oscillations of the conduction electrons, couple strongly to visible light, confining it into subwavelength volumes. In the first part of this work, we study the optical response of metallic nanostructures supported by metallic substrates. We demonstrate that these systems support a charge transfer plasmon mode, whose frequency is primarily determined by the geometry of the contact area between the nanoparticle and the substrate. In the following part, we exploit this knowledge …
Optimal Control Of Active Nematics,
2020
Pennsylvania State University
Optimal Control Of Active Nematics, Michael M. Norton, Piyush Grover, Michael F. Hagan, Seth Fraden
Department of Mechanical and Materials Engineering: Faculty Publications
In this work we present the first systematic framework to sculpt active nematic systems, using optimal control theory and a hydrodynamic model of active nematics. We demonstrate the use of two different control fields, (i) applied vorticity and (ii) activity strength, to shape the dynamics of an extensile active nematic that is confined to a disk. In the absence of control inputs, the system exhibits two attractors, clockwise and counterclockwise circulating states characterized by two co-rotating topological þ1 2 defects. We specifically seek spatiotemporal inputs that switch the system from one attractor to the other; we also examine phase-shifting perturbations. …
Microfluidic Systems With Embedded Cell Culture Chambers For High Throughput Biological Assays,
2020
University of Nebraska-Lincoln
Microfluidic Systems With Embedded Cell Culture Chambers For High Throughput Biological Assays, Arian Jaberi, Amir Monemian Esfahani, Fariba Aghabaglou, Jae Sung Park, Sidy Ndao, Ali Tamayol, Ruiguo Yang
Department of Mechanical and Materials Engineering: Faculty Publications
The ability to generate chemical and mechanical gradients on chips is important both for creating biomimetic designs or enabling high-throughput assays. However, there is still a significant knowledge gap in the generation of mechanical and chemical gradients in a single device. In this study, we developed gradient-generating microfluidic circuits with integrated microchambers to allow cell culture and to introduce chemical and mechanical gradients to cultured cells. A chemical gradient is generated across the microchambers, exposing cells to a uniform concentration of drugs. The embedded microchamber also produces a mechanical gradient in the form of varied shear stresses induced upon cells …
Synthesis And Characterization Of Silver Nanoparticles In Lamellar Lyotropic Liquid Crystal,
2020
Universiti Malaya
Synthesis And Characterization Of Silver Nanoparticles In Lamellar Lyotropic Liquid Crystal, Siti Mariah Mohd Yasin
Student Works (2020-2029)
Lamellar lyotropic liquid crystal-silver nanoparticles (LLLC-AgNPs) are synthesized using the in-situ method. The polarizer microscope showed a mosaic-like pattern with fan shape textures. The high resolution transmission electron microscope (HRTEM) confirmed that the AgNPs are spherical in shape with 4 – 12 nm size. Differential scanning calorimetry (DSC) determined the LLLC-AgNPs transition anisotropic phase to the highly ordered isotropic phase at 300 °C, and crystallinity was completed at 350 °C. Thermogravimetric analysis (TGA) verified that the LLLC-AgNPs were completely decomposed at 700 °C. Ultra-violet visible spectroscopy (UV-vis) found the absorption peaks at around 400 nm and proved that the AgNPs …
Development Of Zeolitic Imidazolate Frameworks For Enhancing Post-Combustion Co2 Capture,
2020
California Polytechnic State University, San Luis Obispo
Development Of Zeolitic Imidazolate Frameworks For Enhancing Post-Combustion Co2 Capture, Dustin Lee
Master's Theses
Post-combustion CO2 capture is a promising approach for complementing other strategies to mitigate climate change. Liquid absorption is currently used to capture CO2 from post-combustion flue gases. However, the high energy cost required to regenerate the liquid absorbents is a major drawback for this process. As a result, solid sorbents have been investigated extensively in recent years as alternative media to capture CO2 from flue gases. For example, metal organic frameworks (MOFs) are nanoporous materials that have high surface areas, large pore volumes, and flexible designs. A large number of MOFs, however, suffer from 1) low CO …
