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- Description:
- The on-going demand for miniaturized optical and on-chip photonic systems of the future has led to a few potential solutions in the literature. Recent advances in van der Waals and 2-dimensional materials signal a bright future for the next generation, compact electronic and photonic devices. With reduced dimensionality and material...
- Keyword:
- Polarization, Phonons, van der Waals, Plasmons, Wave plate, and 2D materials
- Subject:
- Optics, Materials Science, and Electromagnetics
- Creator:
- Abedini Dereshgi, Sina
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 03/24/2023
- Date Created:
- 2023-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- http://dissertations.umi.com/northwestern:16396 and etdadmin_upload_958293
-
- Description:
- Ordered arrays of metallic nanoparticles (NPs) are a promising platform for technological applications and fundamental investigations due to their ability to excite surface lattice resonances (SLRs). SLRs can support extremely high local electric fields that have been used to realize exotic physical phenomena. The open cavity architecture lends itself to...
- Keyword:
- Photonics, Protein Hydrogel, Plasmonics, Titanium Nitride, Nanofabrication, and Surface Lattice Resonance
- Subject:
- Nanotechnology, Optics, and Materials Science
- Creator:
- Reese, Thaddeus Allen
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 06/28/2021
- Date Created:
- 2021-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- http://dissertations.umi.com/northwestern:15496 and etdadmin_upload_799920
-
- Description:
- This dissertation explores ways to utilize physical parameters at the nanoscale interface to control the properties of mixed-dimensional heterojunctions (MDHJs). MDHJs combine the desirable properties of different classes of low-dimensional nanomaterials (materials that are quantum confined in at least one dimension). While MDHJs have achieved superlative performance for a variety...
- Keyword:
- photophysics, mixed-dimensional, low-dimensional, time-resolved spectroscopy, and nanomaterials
- Subject:
- Physical chemistry, Nanoscience, and Materials Science
- Creator:
- Padgaonkar, Suyog
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 10/07/2021
- Date Created:
- 2021-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- etdadmin_upload_827806 and http://dissertations.umi.com/northwestern:15611
-
- Description:
- As conventional electronic materials approach the device scaling limits, new types of materials and structures have been examined for potential use in future electronic and optoelectronic applications including transistors, light emitting diodes, and solar cells. In recent years, atomically thin or two-dimensional (2D) transition metal dichalcogenide (TMD) materials have emerged...
- Keyword:
- electron microscopy, heterostructures, electronic properties, grain boundaries, 2d materials, and interfaces
- Subject:
- Materials Science
- Creator:
- MURTHY, AKSHAY ARUN
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 01/21/2021
- Date Created:
- 2020-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- etdadmin_upload_730816 and http://dissertations.umi.com/northwestern:15038
-
- Description:
- Dental enamel is a complex bio-composite with compositional and structural features across a wide range of length scales. Defects in these features can compromise enamel’s ability to protect the tooth, resulting in adverse health outcomes. Acquired defects like tooth decay are familiar to most people and are the subject of...
- Keyword:
- Amelogenesis, Enamel, Neural networks, X-ray diffraction, Microcomputed tomography, and Mouse models
- Subject:
- Materials Science
- Creator:
- Cooley, Victoria Mae
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 08/23/2023
- Date Created:
- 2023-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- http://dissertations.umi.com/northwestern:16769 and etdadmin_upload_1013954
-
- Description:
- Recent developments have enabled L12-strengthened Co-based superalloys, which have thepotential to surpass Ni-based superalloys as the material of choice for the hottest sections of turbine blades due to cobalt’s 40 ºC higher melting point. The most-studied branch of Co-based superalloys are based on the L12 phase Co3(Al,W); however, there is...
- Keyword:
- Superalloys, Cobalt, Microstructure, Machine Learning, Creep, and High Entropy Alloys
- Subject:
- Materials Science
- Creator:
- Ohl, Brandon
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 05/31/2023
- Date Created:
- 2023-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- etdadmin_upload_971014 and http://dissertations.umi.com/northwestern:16450
-
- Description:
- Physiochemical phenomena in aqueous systems, such as corrosion, catalysis, and energy storage, are driven by the molecular-scale interactions of ionic species with charged solid surfaces. In particular, an electrical double layer (EDL) of ions forms within nanometers of a charged surface. The properties of the EDL have been explored from...
- Keyword:
- Electrical Double Layer, First Principles Molecular Dynamics, X-ray Reflectivity, Solid/Water Interfaces, and Resonant Anomalous X-ray Reflectivity
- Subject:
- Applied physics and Materials Science
- Creator:
- Harmon, Katherine
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 04/15/2021
- Date Created:
- 2021-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- http://dissertations.umi.com/northwestern:15471 and etdadmin_upload_796475
-
- Description:
- This thesis focuses on identifying structure-property-performance relationships in supported nanoparticle catalysts, where an active catalyst material is supported on a high surface area substrate. Identifying these relationships in supported nanoparticle catalysts can be quite challenging, as the complex structure of these catalysts results in numerous potential sources for changes to...
- Keyword:
- Surfaces, Catalysis, Nanoparticles, Interfaces, Density Functional Theory, and Electron Microscopy
- Subject:
- Materials Science and Chemical engineering
- Creator:
- Mansley, Zachary Ryan
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 02/02/2022
- Date Created:
- 2021-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- http://dissertations.umi.com/northwestern:15855 and etdadmin_upload_862543
-
- Description:
- Organic semiconductors are an active area of research with great promise for delivering next generation electronics and clean energy technologies. As the field matures, understanding the connection between molecular structure, materials’ properties, and device performance will be critical in finding the right material for an intended application. An effective strategy...
- Keyword:
- solar cells, diketopyrrolopyrrole, transistors, organic semiconductors, polymers, and fluorination
- Subject:
- Chemistry and Materials Science
- Creator:
- Leonardi, Matthew John
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 02/12/2020
- Date Created:
- 2019-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- etdadmin_upload_660666 and http://dissertations.umi.com/northwestern:14589
-
- Description:
- The commercial success of personal computing has led to the rapid creation and proliferation of diverse electronic systems including desktops, laptops, tablets, mobile devices, and embedded systems. For the past five decades, silicon has served as the base material for computing electronics. However, with increasing demand for unconventional electronics (e.g.,...
- Keyword:
- Amplifiers, Random number generator, Internet of Things, Transistors, Electronic, and Carbon nanotubes
- Subject:
- Electrical engineering and Materials Science
- Creator:
- Gaviria Rojas, William A
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 01/21/2021
- Date Created:
- 2020-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- etdadmin_upload_743198 and http://dissertations.umi.com/northwestern:15110
-
- Description:
- The continuing increase in atmospheric CO2 to concentrations exceeding 400 ppm has attracted considerable attention from both scientists and policymakers. Industrial fossil fuel consumption generates a significant amount of CO2 emissions, and in particular, energy-intensive molecular separations that require thermal processes, such as distillation, drying, or evaporation, are responsible for...
- Keyword:
- Dimensionality, Noble Gases, Hexane, Xylene, Metal-Organic frameworks, and MOFs
- Subject:
- Inorganic chemistry, Chemistry, and Materials Science
- Creator:
- Idrees, Karam
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 08/23/2023
- Date Created:
- 2023-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- etdadmin_upload_991974 and http://dissertations.umi.com/northwestern:16625
-
- Description:
- Increasing industrialization and the resulting negative environmental impacts highlight the need to develop alternative renewable energy sources. The Sun is a massive source and organic solar cells are a growing field of study. As new materials are synthesized, the efficiencies of organic solar cells continue to grow, but without an...
- Keyword:
- x-ray scattering, transient absorption, and organic solar cell
- Subject:
- Physical chemistry, Chemistry, and Materials Science
- Creator:
- Lou, Sylvia Jen-Ming
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 02/12/2020
- Date Created:
- 2018-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- etdadmin_upload_626768 and http://dissertations.umi.com/northwestern:14458
-
- Description:
- Complex microstructures are ubiquitous in nature. The evolution of these microstructures alters their morphology and topology and thus very often dictates material properties, such as mechanical, electronic, thermal, and magnetic properties. Thus, in order to predict and control material properties, it is essential to have robust and efficient techniques to...
- Subject:
- Materials Science
- Creator:
- Elder, Kate Lauren Maud
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 06/28/2021
- Date Created:
- 2021-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- http://dissertations.umi.com/northwestern:15525 and etdadmin_upload_814831
-
- Description:
- Atomistic methods offer a powerful set of tools in the study of materials systems, as they allow materials scientists to ask questions with a high degree of specificity. They are well suited for studying and designing energy materials, critical due to the climate crisis, in part due to their ability...
- Subject:
- Materials Science
- Creator:
- Patel, Shane
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 05/31/2023
- Date Created:
- 2023-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- http://dissertations.umi.com/northwestern:16415 and etdadmin_upload_962311
-
- Description:
- One of the grand challenges in materials chemistry and nanochemistry is the development of functional materials through ordered, hierarchical structures using synthetic building blocks. Nature has done this through evolution of molecular components such as nucleic acids, saccharides, lipids, amino acids, and inorganic crystals. The precise spatial positioning of these...
- Keyword:
- Hierarchical Order, Responsive Materials, Peptide Amphiphiles, Self-Assembly, Materials chemistry, and Nanochemistry
- Subject:
- Chemistry and Materials Science
- Creator:
- Chin, Stacey Megan
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 02/12/2020
- Date Created:
- 2019-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- etdadmin_upload_639807 and http://dissertations.umi.com/northwestern:14525
-
- Description:
- This thesis centers around the development and application of novel high throughput lithography tools. These advances help: 1) establish the field of nanocombinatorics, where massive libraries (termed megalibraries) of materials can be prepared in a positionally encoded manner and then screened for functional activity, and 2) advance stereolithographic 3D printing...
- Keyword:
- Scanning Probe, Nanolithography, 3D Printing, Lithography, Combinatorial Libraries, and Additive Manufacturing
- Subject:
- Nanotechnology, Materials Science, and Chemical engineering
- Creator:
- Hedrick, James Lupton
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 02/12/2020
- Date Created:
- 2019-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- etdadmin_upload_662564 and http://dissertations.umi.com/northwestern:14647
-
- Description:
- The effect of interfaces in solids on the overall charge transport properties has become a topic of growing importance for energy materials such as thermoelectrics. In some polycrystalline thermoelectric materials, the performance near room temperature is significantly limited due to thermally-activated electrical conductivity near room-temperature, which can be attributed to...
- Keyword:
- Contact resistance, Grain boundary, Charge transport model, Thermoelectric, Mg3Sb2, and NMC
- Subject:
- Physics and Materials Science
- Creator:
- Kuo, Jimmy
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 04/15/2021
- Date Created:
- 2021-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- http://dissertations.umi.com/northwestern:15489 and etdadmin_upload_797891
-
- Description:
- Functional electronic materials are difficult to design due to the complex interplay among chemistry, atomic structure, and electrical properties. This dilemma is further amplified in transition metal compounds which can defy the band-theory description of non-correlated electrons. Exploring the vast possible design space completely with experiments or first-principles simulations is...
- Keyword:
- Transition metal oxides, Metal-insulator transition, Machine learning, and Data science
- Subject:
- Materials Science
- Creator:
- Wagner, Nicholas Adam
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 02/12/2020
- Date Created:
- 2019-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- http://dissertations.umi.com/northwestern:14800 and etdadmin_upload_685025
-
- Description:
- Heteroanionic materials are a class of materials of interest for their unique and tunable electronic, ionic, thermal, and optical properties, which are distinct from their homoanionic counterparts due to their multi-anionic nature. Oxynitrides, a type of heteroanionic material, are useful catalysts due to the effect of mixing oxygen and nitrogen...
- Keyword:
- Oxynitrides, In situ synthesis, Tantalum oxynitride, Molybdenum oxynitride, and X-ray diffraction
- Subject:
- Materials Science
- Creator:
- Goldfine, Elise Ann
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 05/31/2023
- Date Created:
- 2023-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- http://dissertations.umi.com/northwestern:16477 and etdadmin_upload_978839
-
- Description:
- Given directives such as the UN Global Goals targeting sustainable development, the research presented herein makes but a small contribution to the advancement of alternative energy technologies. Nevertheless, the present work was largely motivated to address specific points of intrigue within the thermoelectrics community. The general principles demonstrated, however, may...
- Keyword:
- Heat Capacity, Thermal Conductivity, Thermoelectric, Thermodynamics, Thermal Expansion, and Phase Transition
- Subject:
- Physics, Materials Science, and Thermodynamics
- Creator:
- Agne, Matthias Thomas
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 02/01/2021
- Date Created:
- 2020-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- http://dissertations.umi.com/northwestern:15127 and etdadmin_upload_743939