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Bobby G. Sumpter
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Journal Articles

Nanoscale imaging of He-ion irradiation effects on amorphous TaO x toward electroforming-free neuromorphic functions

Olha Popova, Steven J. Randolph, Sabine M. Neumayer, Liangbo Liang, Benjamin Lawrie, Olga S. Ovchinnikova, Robert J. Bondi, Matthew J. Marinella, Bobby G. Sumpter, Petro Maksymovych
Journal: Applied Physics Letters
Appl. Phys. Lett. 123, 153503 (2023)
https://doi.org/10.1063/5.0158380
Published: October 2023
View article titled, Nanoscale imaging of He-ion irradiation effects on amorphous TaO x toward electroforming-free neuromorphic functions
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Journal Articles

Mesoscopic two-point collective dynamics of glass-forming liquids

Zhiqiang Shen, Jan-Michael Y. Carrillo, Bobby G. Sumpter, Yangyang Wang
Journal: The Journal of Chemical Physics
J. Chem. Phys. 159, 114501 (2023)
https://doi.org/10.1063/5.0161866
Published: September 2023
View article titled, Mesoscopic two-point collective dynamics of glass-forming liquids
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Journal Articles

Can a deep-learning model make fast predictions of vacancy formation in diverse materials?

Kamal Choudhary, Bobby G. Sumpter
Journal: AIP Advances
AIP Advances 13, 095109 (2023)
https://doi.org/10.1063/5.0135382
Published: September 2023
View article titled, Can a deep-learning model make fast predictions of vacancy formation in diverse materials?
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Journal Articles

Unsupervised machine learning discovery of structural units and transformation pathways from imaging data

Sergei V. Kalinin, Ondrej Dyck, Ayana Ghosh, Yongtao Liu, Bobby G. Sumpter, Maxim Ziatdinov
Journal: APL Machine Learning
APL Mach. Learn. 1, 026117 (2023)
https://doi.org/10.1063/5.0147316
Published: June 2023
View article titled, Unsupervised machine learning discovery of structural units and transformation pathways from imaging data
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Journal Articles

Small angle scattering of diblock copolymers profiled by machine learning

Chi-Huan Tung, Shou-Yi Chang, Hsin-Lung Chen, Yangyang Wang, Kunlun Hong, Jan Michael Carrillo, Bobby G. Sumpter, Yuya Shinohara, Changwoo Do, Wei-Ren Chen
Journal: The Journal of Chemical Physics
J. Chem. Phys. 156, 131101 (2022)
https://doi.org/10.1063/5.0086311
Published: April 2022
View article titled, Small angle scattering of diblock copolymers profiled by machine learning
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Journal Articles

In situ multimodal imaging for nanoscale visualization of tribofilm formation

Alison A. Pawlicki, Dinesh G. Bansal, Nikolay Borodinov, Alex Belianinov, Kerry Cogen, Dean Clarke, Bobby G. Sumpter, Olga S. Ovchinnikova
Journal: Journal of Applied Physics
J. Appl. Phys. 127, 154303 (2020)
https://doi.org/10.1063/1.5140480
Published: April 2020
View article titled, <em>In situ</em> multimodal imaging for nanoscale visualization of tribofilm formation
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Includes: Supplementary data
Journal Articles

Understanding the effects of dipolar interactions on the thermodynamics of diblock copolymer melts

Rajeev Kumar, Wei Li, Bobby G. Sumpter, Murugappan Muthukumar
Journal: The Journal of Chemical Physics
J. Chem. Phys. 151, 054902 (2019)
https://doi.org/10.1063/1.5114799
Published: August 2019
View article titled, Understanding the effects of dipolar interactions on the thermodynamics of diblock copolymer melts
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Includes: Supplementary data
Journal Articles

Enhanced scattering induced by electrostatic correlations in concentrated solutions of salt-free dipolar and ionic polymers

Rajeev Kumar, Bradley Lokitz, Timothy E. Long, Bobby G. Sumpter
Journal: The Journal of Chemical Physics
J. Chem. Phys. 149, 163336 (2018)
https://doi.org/10.1063/1.5044637
Published: October 2018
View article titled, Enhanced scattering induced by electrostatic correlations in concentrated solutions of salt-free dipolar and ionic polymers
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Includes: Supplementary data
Journal Articles

Understanding the effects of symmetric salt on the structure of a planar dipolar polymer brush

Jyoti P. Mahalik, Bobby G. Sumpter, Rajeev Kumar
Journal: The Journal of Chemical Physics
J. Chem. Phys. 149, 163334 (2018)
https://doi.org/10.1063/1.5037077
Published: August 2018
View article titled, Understanding the effects of symmetric salt on the structure of a planar dipolar polymer brush
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Journal Articles

Ionic liquids-mediated interactions between nanorods

Zhou Yu, Fei Zhang, Jingsong Huang, Bobby G. Sumpter, Rui Qiao
Journal: The Journal of Chemical Physics
J. Chem. Phys. 147, 134704 (2017)
https://doi.org/10.1063/1.5005541
Published: October 2017
View article titled, Ionic liquids-mediated interactions between nanorods
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Includes: Supplementary data
Journal Articles

Focus: Structure and dynamics of the interfacial layer in polymer nanocomposites with attractive interactions

Shiwang Cheng, Bobby Carroll, Vera Bocharova, Jan-Michael Carrillo, Bobby G. Sumpter, Alexei P. Sokolov
Journal: The Journal of Chemical Physics
J. Chem. Phys. 146, 203201 (2017)
https://doi.org/10.1063/1.4978504
Published: March 2017
View article titled, Focus: Structure and dynamics of the interfacial layer in polymer nanocomposites with attractive interactions
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Journal Articles

A Rayleighian approach for modeling kinetics of ionic transport in polymeric media

Rajeev Kumar, Jyoti P. Mahalik, Vera Bocharova, Eric W. Stacy, Catalin Gainaru, Tomonori Saito, Mallory P. Gobet, Steve Greenbaum, Bobby G. Sumpter, Alexei P. Sokolov
Journal: The Journal of Chemical Physics
J. Chem. Phys. 146, 064902 (2017)
https://doi.org/10.1063/1.4975309
Published: February 2017
View article titled, A Rayleighian approach for modeling kinetics of ionic transport in polymeric media
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Includes: Supplementary data
Journal Articles

Revealing spatially heterogeneous relaxation in a model nanocomposite

Shiwang Cheng, Stephen Mirigian, Jan-Michael Y. Carrillo, Vera Bocharova, Bobby G. Sumpter, Kenneth S. Schweizer, Alexei P. Sokolov
Journal: The Journal of Chemical Physics
J. Chem. Phys. 143, 194704 (2015)
https://doi.org/10.1063/1.4935595
Published: November 2015
View article titled, Revealing spatially heterogeneous relaxation in a model nanocomposite
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Journal Articles

Tuning interfacial thermal conductance of graphene embedded in soft materials by vacancy defects

Ying Liu, Chongze Hu, Jingsong Huang, Bobby G. Sumpter, Rui Qiao
Journal: The Journal of Chemical Physics
J. Chem. Phys. 142, 244703 (2015)
https://doi.org/10.1063/1.4922775
Published: June 2015
View article titled, Tuning interfacial thermal conductance of graphene embedded in soft materials by vacancy defects
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Includes: Supplementary data
Journal Articles

Self-assembly and structural relaxation in a model ionomer melt

Monojoy Goswami, Jose M. Borreguero, Bobby G. Sumpter
Journal: The Journal of Chemical Physics
J. Chem. Phys. 142, 084903 (2015)
https://doi.org/10.1063/1.4913517
Published: February 2015
View article titled, Self-assembly and structural relaxation in a model ionomer melt
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Journal Articles

Structure and dynamics of confined flexible and unentangled polymer melts in highly adsorbing cylindrical pores

Jan-Michael Y. Carrillo, Bobby G. Sumpter
Journal: The Journal of Chemical Physics
J. Chem. Phys. 141, 074904 (2014)
https://doi.org/10.1063/1.4893055
Published: August 2014
View article titled, Structure and dynamics of confined flexible and unentangled polymer melts in highly adsorbing cylindrical pores
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Includes: Supplementary data
Journal Articles

Charge regulation and local dielectric function in planar polyelectrolyte brushes

Rajeev Kumar, Bobby G. Sumpter, S. Michael Kilbey, II
Journal: The Journal of Chemical Physics
J. Chem. Phys. 136, 234901 (2012)
https://doi.org/10.1063/1.4729158
Published: June 2012
View article titled, Charge regulation and local dielectric function in planar polyelectrolyte brushes
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Includes: Supplementary data
Journal Articles

Density-functional approaches to noncovalent interactions: A comparison of dispersion corrections (DFT-D), exchange-hole dipole moment (XDM) theory, and specialized functionals

Lori A. Burns, Álvaro Vázquez- Mayagoitia, Bobby G. Sumpter, C. David Sherrill
Journal: The Journal of Chemical Physics
J. Chem. Phys. 134, 084107 (2011)
https://doi.org/10.1063/1.3545971
Published: February 2011
View article titled, Density-functional approaches to noncovalent interactions: A comparison of dispersion corrections (DFT-D), exchange-hole dipole moment (XDM) theory, and specialized functionals
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Includes: Supplementary data
Journal Articles

Effect of polymer-filler interaction strengths on the thermodynamic and dynamic properties of polymer nanocomposites

Monojoy Goswami, Bobby G. Sumpter
Journal: The Journal of Chemical Physics
J. Chem. Phys. 130, 134910 (2009)
https://doi.org/10.1063/1.3105336
Published: April 2009
View article titled, Effect of polymer-filler interaction strengths on the thermodynamic and dynamic properties of polymer nanocomposites
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Journal Articles

A single molecule rectifier with strong push-pull coupling

Aldilene Saraiva-Souza, Fabricio Macedo de Souza, Vicente F. P. Aleixo, Eduardo Costa Girão, Josué Mendes Filho, Vincent Meunier, Bobby G. Sumpter, Antônio Gomes Souza Filho, Jordan Del Nero
Journal: The Journal of Chemical Physics
J. Chem. Phys. 129, 204701 (2008)
https://doi.org/10.1063/1.3020353
Published: November 2008
View article titled, A single molecule rectifier with strong push-pull coupling
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