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-
- Description:
- Human skin oils are significant scavengers of atmospheric oxidants in occupied indoor environments. Many techniques used to study gas-phase transformations of surface films indoors have been limited to off-line bulk analysis, although more surface-selective methodologies are emerging. Here, we present a multi-prong analytical approach to characterizing skin oil ozonolysis. Skin...
- Keyword:
- squalene, nonlinear spectroscopy, ozonolysis, indoor air, optical profilometry, and surface science
- Subject:
- Physical chemistry and Chemistry
- Creator:
- Butman, Jana Lee
- 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:16586 and etdadmin_upload_986300
-
- Description:
- This thesis document is comprised of three research projects. The first investigates the active vibrational modes involved in twisted intramolecular charge transfer in a Julolidine-BODIPY dyad using two-dimensional electronic spectroscopy along with DFT calculations. We identified two types of vibrations, compression and torsional motion, as playing an important role in...
- Subject:
- Organic chemistry, Physical chemistry, and Chemistry
- Creator:
- Fisher, Jeremy
- 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:16773 and etdadmin_upload_1014057
-
- Description:
- Organic semiconductors have shown great promise for optoelectronic applications, particularly solar photovoltaics. Critical to their success is the ability to understand and manipulate the relationship between molecular structure and bulk properties. Substantial progress on understanding structural influences on electronic properties has been made for the conjugated polymers and small molecules...
- Keyword:
- Aggregation, Ultrafast Spectroscopy, PTB7, Spectroscopy, Organic Semiconductor, and Organic Photovoltaic
- Subject:
- Physical chemistry, Chemistry, and Condensed matter physics
- Creator:
- Fauvell, Thomas James
- 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:14521 and etdadmin_upload_639550
-
- Description:
- Many processes in nature and human-made settings rely on the unique properties of charged metal oxide:aqueous interfaces. Despite their ubiquity, these buried interfaces are challenging to study, since any analytical technique aiming to overcome the relatively small number density of interfacial versus bulk species must be highly sensitive and surface-selective....
- Keyword:
- solid aqueous interface, second harmonic generation, nonlinear optical spectroscopy, metal oxide, heterodyne detection, and hematite
- Subject:
- Physical chemistry, Geochemistry, and Chemistry
- Creator:
- Lozier, Emilie
- 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:16725 and etdadmin_upload_1012560
-
- Description:
- This dissertation focuses on the study of the superionic state in multicomponent systems, where the smaller component exhibits delocalization and mobility while still maintaining system compactness through component attractions. Superionic behavior is widely observed in various systems and plays a crucial role in ceramic superionic conductors, which offer high ion...
- Keyword:
- electrostatics, charge transport, sublattice melting, phase transition, superionic behaviors, and colloidal crystals
- Subject:
- Physical chemistry, Chemistry, and Condensed matter physics
- Creator:
- Lin, Yange
- 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:16697 and etdadmin_upload_1009942
-
- 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:
- This dissertation describes the study of photoinduced charge transfer between QDs and molecular acceptors as a probe of the defects within ligand shells of QDs and as means to photocatalyze redox reactions. For charge transfer reactions to occur between QDs and molecules in bulk solution, the molecules must interact with...
- Keyword:
- Quantum dots, Photoredox, Photochemical deprotection, Fluorinated ligands, and Surface chemistry
- Subject:
- Physical chemistry and Chemistry
- Creator:
- Perez, Kaitlyn
- 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:15131 and etdadmin_upload_743985
-
- Description:
- Organic photovoltaics offer an opportunity to make solar cells more affordable and widely accessible using cheap, solution-processable light-absorbing layers. In order to realize new technologies, a fundamental understanding of organic chromophore photophysics is required to overcome efficiency limitations. Throughout this doctoral work, I investigated the kinetic and physical characteristics of...
- Keyword:
- non-linear spectroscopy, charge separation, singlet fission, environmental justice, and organic photovoltaic
- Subject:
- Physical chemistry, Chemistry, and Energy
- Creator:
- Ramirez, Carolyn E.
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 09/22/2022
- Date Created:
- 2022-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- etdadmin_upload_916673 and http://dissertations.umi.com/northwestern:16153
-
- Description:
- Over the past 15 years, there have been significant developments in expanding the singlet fission (SF) library and understanding the SF mechanism. SF has been a topic of interest in recent years due to its potential applications in organic photovoltaics. During SF, a singlet exciton energetically down-converts into two triplet...
- Subject:
- Physical chemistry and Chemistry
- Creator:
- Chen, Michelle
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 02/01/2021
- Date Created:
- 2020-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- etdadmin_upload_768182 and http://dissertations.umi.com/northwestern:15313
-
- Description:
- This work examines important heterogeneous processes of organic molecules on surfaces, in the contexts of atmospheric and indoor environments. In large forest ecosystems, biogenic secondary organic aerosols (SOAs) constitute a dominant fraction of organic particulate matter in the atmosphere. The formation of SOAs starts from the emission of volatile organic...
- Subject:
- Physical chemistry, Chemistry, and Environmental science
- Creator:
- Liu, Yangdongling
- 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:15742 and etdadmin_upload_844595
-
- Description:
- Understanding the photophysical processes of organic materials is important for utilizing them as functional photonic materials. Typical photophysical processes include intersystem crossing, charge transfer (CT), symmetry-breaking charge separation (SB-CS), singlet fission (SF), etc. There are serval factors that can lead to different photophysical processes, such as the molecular energy levels,...
- Subject:
- Physical chemistry and Chemistry
- Creator:
- Lin, Chenjian
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 02/16/2023
- Date Created:
- 2022-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- etdadmin_upload_947331 and http://dissertations.umi.com/northwestern:16377
-
- Description:
- Despite the increasing interest in biogenic secondary organic aerosols (SOAs), their role in the climate system remains the greatest source of uncertainty in global models. Cloud formation, critical for the net cooling effect provided by cloud cover, is dependent on the abundance of SOA particles and their ability to activate...
- Subject:
- Physical chemistry, Atmospheric chemistry, and Chemistry
- Creator:
- Bellcross, Aleia
- 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:16628 and etdadmin_upload_993914
-
- Description:
- This thesis presents results on photophysics and spin dynamics of photoactive organic molecules that possess one unpaired electron spin in the ground state and two or three unpaired spins upon photoexcitation. The excited state dynamics of the systems were studied using transient optical absorption spectroscopies and non-Boltzmann population on the...
- Subject:
- Physical chemistry and Chemistry
- Creator:
- Mao, Haochuan
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 02/16/2023
- Date Created:
- 2022-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- etdadmin_upload_946833 and http://dissertations.umi.com/northwestern:16364
-
- Description:
- Recent progress in semiconductor synthesis and photophysics has revealed a host of new materials with exciting properties for applications in optoelectronic devices such as sensors, photovoltaics, solid state lighting, and more. One of the most significant recent additions to the field is the class of hybrid and inorganic materials that...
- Subject:
- Physical chemistry, Chemistry, and Materials Science
- Creator:
- Cuthriell, Shelby A
- 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:16650 and etdadmin_upload_1000360
-
- Description:
- Semiconductor nanocrystals possess unique photophysical properties that make them desirable for many optoelectronic applications such as photovoltaics, LEDs, and quantum computing. When the size of a semiconductor is reduced to below the excitonic Bohr radius of the material, its carriers becomes quantum confined resulting in drastic changes to optical, electronic,...
- Keyword:
- Nanocrystals, Spin, Semiconductors, Spectroscopy, Thermal properties, and Carrier Dynamics
- Subject:
- Physical chemistry, Chemistry, and Materials Science
- Creator:
- Harvey, Samantha
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 02/02/2022
- Date Created:
- 2021-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- etdadmin_upload_857543 and http://dissertations.umi.com/northwestern:15830
-
- Description:
- The physical boundary layer, or interface, between two different phases of matter is the site of chemical and physical processes that are critical to many research fields. Many of these interfaces contain electric charge, which influences the structure and composition of the interfacial region and the interactions between the interface...
- Keyword:
- Second harmonic generation, Mineral, Sum frequency generation, Spectroscopy, Interface, and Water
- Subject:
- Physical chemistry and Chemistry
- Creator:
- Ohno, Paul Erich
- 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:14749 and etdadmin_upload_675952
-
- Description:
- In this thesis, I present the development and benchmarking of several theoretical methods designed to enable the rigorous modeling of magnetic properties of molecules containing one or a few heavy atoms, particularly single-molecule magnets. The new methods use a full four-component treatment of relativity, allowing spin–orbit effects to be taken...
- Keyword:
- Single-Molecule Magnets, Electronic Structure, Relativity, Theoretical Chemistry, Zero-Field Splitting, and Magnetizability
- Subject:
- Physical chemistry, Chemistry, and Computational chemistry
- Creator:
- Reynolds, Ryan Dave
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 02/12/2020
- Date Created:
- 2018-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- etdadmin_upload_623099 and http://dissertations.umi.com/northwestern:14425