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- Description:
- A fundamental materials science question is “why and how will this material form?” The experimental,computation, and time resources necessary to answer this question consume significant resources due to the predominantly trial-and-error based approaches common in materials research. This dissertation reintroduces a number of fundamental thermodynamics-based tools for the study of...
- Keyword:
- Density Functional Theory, Aqueous Synthesis, Driving Force, Thermodynamics, Pourbaix Diagram, and Speciation
- Subject:
- Physics, Chemistry, and Materials Science
- Creator:
- Walters, Lauren Nichole
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 02/16/2023
- Date Created:
- 2022-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- http://dissertations.umi.com/northwestern:16360 and etdadmin_upload_946544
-
- Description:
- Coherent diffractive imaging (CDI) methods are techniques that image a sample by illuminating it with a coherent beam and recording the intensity diffraction pattern produced by the wavefront outgoing from the sample. These are lensless methods that are not limited in resolution by the physical characteristics of an objective lens,...
- Subject:
- Applied physics and Physics
- Creator:
- Kandel, Saugat
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 10/07/2021
- Date Created:
- 2021-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- http://dissertations.umi.com/northwestern:15629 and etdadmin_upload_830433
-
- Description:
- Renewable energy technology, more so than ever before, is critical to the survival of humanity. For decades, concentrated efforts into designing and developing such novel devices resulted in the innovation of solar-driven photovoltaics that were competitive with nonrenewable alternatives. This thesis explores the dynamic behavior of alternative material candidates that...
- Keyword:
- electronic, structural, perovskite, spectroscopy, two-dimensional, and nanomaterials
- Subject:
- Physics, Chemistry, and Materials Science
- Creator:
- Panuganti, Shobhana
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 08/23/2023
- Date Created:
- 2023-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- etdadmin_upload_1010644 and http://dissertations.umi.com/northwestern:16703
-
- Description:
- Engineering responses of soft materials at hierarchical time and length scales is of great interest to both fundamental science and technological applications. In recent years, the hybridization between emerging soft condense matters and conventional hard condense matters keeps enriching the materials library of humankind and opens another largely-uncharted venue for...
- Keyword:
- Collective Behavior, Soft Materials, Stimuli-responsive Materials, Active Colloids, Active Matter, and Stokesian Dynamics
- Subject:
- Physics, Materials Science, and Computational physics
- Creator:
- Yuan, Hang
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 06/22/2022
- Date Created:
- 2022-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- http://dissertations.umi.com/northwestern:16039 and etdadmin_upload_900796
-
- Description:
- Light is a powerful tool for manipulating and probing magnetic states in solid state systems. In particular, optically-induced spin orientation, the ability to orient spin with polarized light, has been extensively utilized in low-dimensional III-V and II-VI semiconductors to pioneer spintronic research. Even though traditional semiconductors have found a wide...
- Keyword:
- Layered Semiconductors, Optical Spin Dynamics, Monochalcogenides, van der Waals Systems, and Magneto-optics
- Subject:
- Physics and Condensed matter physics
- Creator:
- Nelson, Jovan Julius
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 05/31/2023
- Date Created:
- 2023-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- etdadmin_upload_982678 and http://dissertations.umi.com/northwestern:16502
-
- Description:
- On-shell formulations of scattering amplitudes for quantum field theories, without utilizating the local descriptions of Lagrangian and Feynman diagrams, have become increasingly useful and important in recent years for both formal and practical reasons. The nonlinear sigma model (NLSM), which describes the interactions between Nambu-Goldstone bosons, is an ideal testing...
- Keyword:
- Soft bootstrap, Effective field theory, Nonlinear sigma model, Soft theorem, and Scattering amplitude
- Subject:
- Physics
- Creator:
- Yin, Zhewei
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 02/01/2021
- Date Created:
- 2020-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- etdadmin_upload_750160 and http://dissertations.umi.com/northwestern:15166
-
- Description:
- Superconducting qubits are among the leading competitors in the race towards building the first full-fledged quantum computer. Using this platform, researchers have for the first time demonstrated computational capability that is beyond the reach of the current classical machines. (This achievement is nicknamed "Quantum Supremacy".) Up to date, however, the...
- Keyword:
- Superconducting Qubit, Protected Qubit, Noise Engineering, and Dynamical Sweet Spot
- Subject:
- Physics, Quantum physics, and Condensed matter physics
- Creator:
- Huang, Ziwen
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 10/07/2021
- Date Created:
- 2021-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- http://dissertations.umi.com/northwestern:15760 and etdadmin_upload_845242
-
- Description:
- Quantum technologies have the capability of greatly increasing the security of communication systems. Many components are required for a full quantum network including memory, repeaters, routers, and detectors. The efficiencies of quantum communication technologies suffer greatly due to their inherent sensitivity to loss. Low-loss propagation and high detection efficiency can...
- Keyword:
- Photonics, Quantum optics, Nonlinear optics, and Upconversion
- Subject:
- Optics, Physics, and Electrical engineering
- Creator:
- Silver, Michael Lee
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 02/12/2020
- Date Created:
- 2018-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- etdadmin_upload_627388 and http://dissertations.umi.com/northwestern:14474
-
- Description:
- The nature of dark matter (DM) remains one of the largest open questions in modern physics despite the many searches for particle dark matter around the world. The search for dark matter particles with masses above 5 GeV/$c^2$ is led by the dual-phase xenon time-projection chamber (LXe-TPC) detector technology which...
- Keyword:
- instrumentation, xenon, dark matter, and backgrounds
- Subject:
- Physics
- Creator:
- Temples, Dylan Jason
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 10/07/2021
- Date Created:
- 2021-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- http://dissertations.umi.com/northwestern:15665 and etdadmin_upload_836782
-
- Description:
- The BV Laplacian Δ, first introduced by Batalin and Vilkovisky, is a second-order differential operator that appears in the quantum master equation for quantizing gauge theories. The geometric framework for the BV formalism was later recognized by Schwarz as the setting of odd symplectic geometry and Khudaverdian showed that Δ...
- Subject:
- Mathematics and Physics
- Creator:
- Kumar, Nilay
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 10/07/2021
- Date Created:
- 2021-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- etdadmin_upload_845582 and http://dissertations.umi.com/northwestern:15776
-
- 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:
- 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
-
- Description:
- Interfacial science brings together diverse areas of interest such as electronic materials, quantum materials, bio-membranes and catalysts. In-situ X-ray characterization techniques can be used to understand the assembly of atoms, molecules and supported nanoparticles at interfaces in complex environments. This thesis work focuses on the use of various X-ray characterization...
- Keyword:
- Atomic Layer Deposition, X-ray standing wave, Catalysis, Thin film, X-ray spectroscopy, and X-ray physics
- Subject:
- Physics and Materials Science
- Creator:
- Das, Anusheela
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 06/22/2022
- Date Created:
- 2022-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- http://dissertations.umi.com/northwestern:15916 and etdadmin_upload_877997
-
- Description:
- Micro-X is a high-resolution X-ray spectroscopy sounding rocket mission that had its first flight in July 2018, becoming the first program to carry Transition-Edge Sensors (TES) and multiplexing Superconducting QUantum Interference Device (SQUID) readout electronics into space, successfully collect data, and subsequently recover the instruments. While a rocket pointing failure...
- Keyword:
- TES, Sounding Rocket, Microcalorimeter, SQUID multiplexing, and X-ray
- Subject:
- Astrophysics, Physics, and Low temperature physics
- Creator:
- Manzagol-Harwood, Renee Elisabeth
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 02/16/2023
- Date Created:
- 2022-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- etdadmin_upload_937247 and http://dissertations.umi.com/northwestern:16308
-
- Description:
- The presented thesis introduces our work of extending high-resolution x-ray 3D imaging towards extended samples. With the advent of x-ray sources with higher brightness and better coherence, as well as the rise of the needs to examine the fine structures of large objects in the field of materials science, biology,...
- Keyword:
- Optics, 3D imaging, Tomography, X-ray imaging, and High-resolution
- Subject:
- Optics, Physics, and Medical imaging
- Creator:
- Du, Ming
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 02/12/2020
- Date Created:
- 2019-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- etdadmin_upload_658737 and http://dissertations.umi.com/northwestern:14577
-
- Description:
- The leptonic and inclusive hadronic decay branching fractions of the W boson are studied using 35.9 $fb^{-1}$ of proton-proton collision data collected at $\sqrt{s}=13~TeV$ during the 2016 run of the CMS experiment. Events characterized by the production of pairs of W bosons from \ttbar and \tW processes are selected. Multiple...
- Keyword:
- lepton flavor universality, W boson branching fraction, and CMS
- Subject:
- Physics and Particle physics
- Creator:
- Chen, Ziheng
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 10/07/2021
- Date Created:
- 2021-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- http://dissertations.umi.com/northwestern:15758 and etdadmin_upload_845225
-
- Description:
- As polymer science has advanced as a field, so too have the uses for polymeric materials. We encounter polymers and plastics on a daily basis, and while their presence has greatly improved our quality of life, they have also had a profound and often negative impact on our environment. Plastic...
- Keyword:
- polyelectrolyte complex, random copolymer, enzymatic degradation, flocculation, nanoplastics, and chemical remediation
- Subject:
- Environmental science, Polymer chemistry, and Physics
- Creator:
- Wang, Jeremy
- 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:16429 and etdadmin_upload_963641
-
- Description:
- Electrostatic interactions mediated by ionic environments play a central role in physical processes across materials science, chemistry and biology. Key biological phenomena, such as the condensation and packaging of DNA, ion transport across cellular membranes and the enzymatic action of proteins, rely on the complex interplay between nanoscale electrostatic, osmotic...
- Subject:
- Physics and Materials Science
- Creator:
- Krishnamoorthy, Kurinji
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 02/12/2020
- Date Created:
- 2018-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- http://dissertations.umi.com/northwestern:14487 and etdadmin_upload_632859
-
- Description:
- As fourth-generation synchrotron x-ray sources start to come online, they bring with them the promise of increased imaging speed and resolution for current imaging modalities, while enabling entirely new ones. Employing the increased brightness at hard x-ray energies begins with having efficient focusing optics in place. Zone plates are popular...
- Subject:
- Physics and Computational physics
- Creator:
- Syed, Sajid Ali
- 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:15831 and etdadmin_upload_857546
-
- Description:
- Nuclear magnetic resonance (NMR) measurements have been performed on the heavily Cu-doped ($x = 0.13$, 0.18, 0.24, 0.39, 0.48), and underdoped (x = 0.01 and 0.012) \NaFeCuAs~ single crystals, to reveal the nature of the magnetism, and to investigate how the electronic and magnetic properties of the system evolves with...
- Keyword:
- iron pnictides, nuclear magnetic resonance, and magnetism
- Subject:
- Physics
- Creator:
- Xin, Yizhou
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 04/15/2021
- Date Created:
- 2021-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- etdadmin_upload_795405 and http://dissertations.umi.com/northwestern:15465
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