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15 results on '"Patten, Lance K."'

2. Electronic Structure and Excited-State Dynamics of DNA-Templated Monomers and Aggregates of Asymmetric Polymethine Dyes

Author

Duncan, Katelyn M., primary, Byers, Hannah M., additional, Houdek, Madaline E., additional, Roy, Simon K., additional, Biaggne, Austin, additional, Barclay, Matthew S., additional, Patten, Lance K., additional, Huff, Jonathan S., additional, Kellis, Donald L., additional, Wilson, Christopher K., additional, Lee, Jeunghoon, additional, Davis, Paul H., additional, Mass, Olga A., additional, Li, Lan, additional, Turner, Daniel B., additional, Hall, John A., additional, Knowlton, William B., additional, Yurke, Bernard, additional, and Pensack, Ryan D., additional

Published
2023
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3. Exciton delocalization in a fully synthetic DNA-templated bacteriochlorin dimer.

Author

Mass, Olga A., Watt, Devan R., Patten, Lance K., Pensack, Ryan D., Lee, Jeunghoon, Turner, Daniel B., Yurke, Bernard, and Knowlton, William B.

Abstract

A bacteriochlorophyll a (Bchla) dimer is a basic functional unit in the LH1 and LH2 photosynthetic pigment–protein antenna complexes of purple bacteria, where an ordered, close arrangement of Bchla pigments—secured by noncovalent bonding to a protein template—enables exciton delocalization at room temperature. Stable and tunable synthetic analogs of this key photosynthetic subunit could lead to facile engineering of exciton-based systems such as in artificial photosynthesis, organic optoelectronics, and molecular quantum computing. Here, using a combination of synthesis and theory, we demonstrate that exciton delocalization can be achieved in a dimer of a synthetic bacteriochlorin (BC) featuring stability, high structural modularity, and spectral properties advantageous for exciton-based devices. The BC dimer was covalently templated by DNA, a stable and highly programmable scaffold. To achieve exciton delocalization in the absence of pigment–protein interactions critical for the Bchla dimer, we relied on the strong transition dipole moment in BC enabled by two auxochromes along the Qy transition, and omitting the central metal and isocyclic ring. The spectral properties of the synthetic "free" BC closely resembled those of Bchla in an organic solvent. Applying spectroscopic modeling, the exciton delocalization in the DNA-templated BC dimer was evaluated by extracting the excitonic hopping parameter, J to be 214 cm−1 (26.6 meV). For comparison, the same method applied to the natural protein-templated Bchla dimer yielded J of 286 cm−1 (35.5 meV). The smaller value of J in the BC dimer likely arose from the partial bacteriochlorin intercalation and the difference in medium effect between DNA and protein. [ABSTRACT FROM AUTHOR]

Published
2023
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4. Towards control of excitonic coupling in DNA-templated Cy5 aggregates: the principal role of chemical substituent hydrophobicity and steric interactions

Author

Díaz, Sebastián A., primary, Pascual, Gissela, additional, Patten, Lance K., additional, Roy, Simon K., additional, Meares, Adam, additional, Chiriboga, Matthew, additional, Susumu, Kimihiro, additional, Knowlton, William B., additional, Cunningham, Paul D., additional, Mathur, Divita, additional, Yurke, Bernard, additional, Medintz, Igor L., additional, Lee, Jeunghoon, additional, and Melinger, Joseph S., additional

Published
2023
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6. Tunable Electronic Structure via DNA-Templated Heteroaggregates of Two Distinct Cyanine Dyes

Author

Huff, Jonathan S., primary, Díaz, Sebastián A., additional, Barclay, Matthew S., additional, Chowdhury, Azhad U., additional, Chiriboga, Matthew, additional, Ellis, Gregory A., additional, Mathur, Divita, additional, Patten, Lance K., additional, Roy, Simon K., additional, Sup, Aaron, additional, Biaggne, Austin, additional, Rolczynski, Brian S., additional, Cunningham, Paul D., additional, Li, Lan, additional, Lee, Jeunghoon, additional, Davis, Paul H., additional, Yurke, Bernard, additional, Knowlton, William B., additional, Medintz, Igor L., additional, Turner, Daniel B., additional, Melinger, Joseph S., additional, and Pensack, Ryan D., additional

Published
2022
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7. Tuning between Quenching and Energy Transfer in DNA-Templated Heterodimer Aggregates

Author

Chowdhury, Azhad U., primary, Díaz, Sebastián A., additional, Huff, Jonathan S., additional, Barclay, Matthew S., additional, Chiriboga, Matthew, additional, Ellis, Gregory A., additional, Mathur, Divita, additional, Patten, Lance K., additional, Sup, Aaron, additional, Hallstrom, Natalya, additional, Cunningham, Paul D., additional, Lee, Jeunghoon, additional, Davis, Paul H., additional, Turner, Daniel B., additional, Yurke, Bernard, additional, Knowlton, William B., additional, Medintz, Igor L., additional, Melinger, Joseph S., additional, and Pensack, Ryan D., additional

Published
2022
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9. Excited-State Lifetimes of DNA-Templated Cyanine Dimer, Trimer, and Tetramer Aggregates: The Role of Exciton Delocalization, Dye Separation, and DNA Heterogeneity

Author

Huff, Jonathan S., primary, Turner, Daniel B., additional, Mass, Olga A., additional, Patten, Lance K., additional, Wilson, Christopher K., additional, Roy, Simon K., additional, Barclay, Matthew S., additional, Yurke, Bernard, additional, Knowlton, William B., additional, Davis, Paul H., additional, and Pensack, Ryan D., additional

Published
2021
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10. Localized deformation in Ni-Mn-Ga single crystals.

Author

Davis, Paul H., Efaw, Corey M., Patten, Lance K., Hollar, Courtney, Watson, Chad S., Knowlton, William B., and Müllner, Peter

Subjects
SINGLE crystals, DEFORMATIONS (Mechanics), FERROMAGNETIC materials, SHAPE memory alloys, CRYSTAL structure, ELASTIC modulus, TWINNING (Crystallography), MAGNETOMECHANICAL effects
Abstract

The magnetomechanical behavior of ferromagnetic shape memory alloys such as Ni-Mn-Ga, and hence the relationship between structure and nanoscale magnetomechanical properties, is of interest for their potential applications in actuators. Furthermore, due to its crystal structure, the behavior of Ni-Mn-Ga is anisotropic. Accordingly, nanoindentation and magnetic force microscopy were used to probe the nanoscale mechanical and magnetic properties of electropolished single crystalline 10M martensitic Ni-Mn-Ga as a function of the crystallographic c-axis (easy magnetization) direction relative to the indentation surface (i.e., c-axis in-plane versus out-of-plane). Load-displacement curves from 5–10 mN indentations on in-plane regions exhibited pop-in during loading, whereas this phenomenon was absent in out-of-plane regions. Additionally, the reduced elastic modulus measured for the c-axis out-of-plane orientation was ∼50% greater than for in-plane. Although heating above the transition temperature to the austenitic phase followed by cooling to the room temperature martensitic phase led to partial recovery of the indentation deformation, the magnitude and direction of recovery depended on the original relative orientation of the crystallographic c-axis: positive recovery for the in-plane orientation versus negative recovery (i.e., increased indent depth) for out-of-plane. Moreover, the c-axis orientation for out-of-plane regions switched to in-plane upon thermal cycling, whereas the number of twins in the in-plane regions increased. We hypothesize that dislocation plasticity contributes to the permanent deformation, while pseudoelastic twinning causes pop-in during loading and large recovery during unloading in the c-axis in-plane case. Minimization of indent strain energy accounts for the observed changes in twin orientation and number following thermal cycling. [ABSTRACT FROM AUTHOR]

Published
2018
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12. Tunable Electronic Structure via DNA-Templated Heteroaggregates of Two Distinct Cyanine Dyes.

Author

Huff, Jonathan S., Díaz, Sebastián A., Barclay, Matthew S., Chowdhury, Azhad U., Chiriboga, Matthew, Ellis, Gregory A., Mathur, Divita, Patten, Lance K., Roy, Simon K., Sup, Aaron, Biaggne, Austin, Rolczynski, Brian S., Cunningham, Paul D., Li, Lan, Lee, Jeunghoon, Davis, Paul H., Yurke, Bernard, Knowlton, William B., Medintz, Igor L., and Turner, Daniel B.

Published
2020
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15. Coherent Exciton Delocalization in a Two-State DNA-Templated Dye Aggregate System

Author

Cannon, Brittany L., Kellis, Donald L., Patten, Lance K., Davis, Paul H., Lee, Jeunghoon, Graugnard, Elton, Yurke, Bernard, and Knowlton, William B.

Abstract

Coherent exciton delocalization in dye aggregate systems gives rise to a variety of intriguing optical phenomena, including J- and H-aggregate behavior and Davydov splitting. Systems that exhibit coherent exciton delocalization at room temperature are of interest for the development of artificial light-harvesting devices, colorimetric detection schemes, and quantum computers. Here, we report on a simple dye system templated by DNA that exhibits tunable optical properties. At low salt and DNA concentrations, a DNA duplex with two internally functionalized Cy5 dyes (i.e., dimer) persists and displays predominantly J-aggregate behavior. Increasing the salt and/or DNA concentrations was found to promote coupling between two of the DNA duplexes via branch migration, thus forming a four-armed junction (i.e., tetramer) with H-aggregate behavior. This H-tetramer aggregate exhibits a surprisingly large Davydov splitting in its absorbance spectrum that produces a visible color change of the solution from cyan to violet and gives clear evidence of coherent exciton delocalization.

Published
2024
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