Publications

Displaying 26 - 50 of 112

Layering of Magnetic Nanoparticles at Amorphous Magnetic Templates with Perpendicular Anisotropy

August 26, 2020

Author(s)

Apurve Saini, Julie Borchers, Sebastian George, Brian B. Maranville, Kathryn L. Krycka, Joseph Dura, Katharina Theis-Brohl, Max Wolff

We reveal the assembly of monodisperse magnetite nanoparticles of sizes 5 nm, 15 nm and 25 nm from dilute water-based ferrofluids onto an amorphous magnetic template with out-ofplane anisotropy. From neutron reflectometry experiments we extract density

Self-Assembly of Magnetic Nanoparticles in Ferrofluids on Different Templates Investigated by Neutron Reflectometry

June 24, 2020

Author(s)

Katharina Theis-Brohl, Apurve Saini, Max Wolff, Joseph Dura, Brian B. Maranville, Julie Borchers

This article reviews the self-assembly of magnetite nanoparticles onto solid surfaces. We focus on neutron reflectometry studies providing information on the density and magnetization profiles of buried interfaces. Specific attention is given to the near

Enhanced Conductivity via Homopolymer-Rich Pathways in Block Polymer-Blended Electrolytes

December 24, 2019

Author(s)

Melody A. Morris, Seung Hyun Sung, Priyanka M. Ketkar, Joseph Dura, Ryan Nieuwendaal, III Epps

The optimization of ionic conductivity and lithium-ion battery stability can be achieved by independently tuning the ion transport and mechanical robustness of block polymer (BP) electrolytes. However, the ionic conductivity of BP electrolytes is

In Situ Neutron Reflectometry Study of Solid Electrolyte Interface (SEI) Formation on Tungsten Thin-Film Electrodes

December 18, 2019

Author(s)

Eric Daniel Rus, Joseph Dura

Tungsten, a non-Li-intercalating material, was used as a platform to study solid-electrolyte interface/interphase (SEI) formation in lithium hexafluorphosphate in mixed diethyl carbonate (DEC)/ethylene carbonate (EC) electrolyte solutions using in situ

Nuclear Spin Incoherent Neutron Scattering from Quantum Well Resonators

July 1, 2019

Author(s)

Max Wolff, Anton Devishvili, Joseph Dura, Franz A. Adlmann, Brian Kitchen, Gunnar K. Palsson, Heikki Palonen, Brian B. Maranville, Charles Majkrzak, Boris P. Toperverg

We report the detection and quantification of nuclear spin incoherent scattering from hydrogen occupying interstitial sites in a thin film of vanadium. The neutron wave field is enhanced in a quantum resonator with magnetically switchable iron boundaries

Direct, Operando Observation of the Bilayer Solid Electrolyte Interphase Structure: Electrolyte Reduction on a Non-Intercalating Electrode

February 1, 2019

Author(s)

Christopher H. Lee, Joseph Dura, Amy LeBar, Steven C. DeCaluwe

The solid electrolyte interphase remains a central challenge to lithium-ion battery durability, in part due to poor understanding of the basic chemistry responsible for its formation and evolution. In this study, the SEI on a non-intercalating, thin-film

Highly Reversible Zinc Metal Anode for Aqueous Batteries

June 1, 2018

Author(s)

Fei Wang, Oleg Borodin, Tao Gao, Xiulin Fan, Wei Sun, Fudong Han, Antonio Faraone, Joseph Dura, Kang Xu, Chunsheng Wang

Metallic zinc (Zn) has been regarded as an ideal anode material for aqueous batteries, because of its high theoretical capacity (820 mAh/g), low electrochemical potential (-0.762 V vs. SHE), high abundance, low toxicity and intrinsic safety. There has been

Nanoconfinement-Induced Phase Segregation of Binary Benzene-Cyclohexane Solutions within a Chemically Inert Matrix

April 12, 2018

Author(s)

Kathryn Krycka, Joseph A. Dura, II Langston, Christopher M. Burba

While a clear understanding of the effects of nanoconfinement on phase transitions of single components liquids is emerging, binary solutions hold promise to provide a fertile and detailed arena to probe intermolecular and molecular/surface interactions

Structure-Property Relationships at Nafion Thin-Film Interfaces: Thickness Effects on Hydration and Anisotropic Ion Transport

April 3, 2018

Author(s)

Steven C DeCaluwe, Andrew M. Baker, Pavan Bhargava, John E. Fischer, Joseph Dura

The effect of film thickness on water uptake and structure in ultra-thin Nafion films is probed via in situ neutron reflectometry for a series of 10 samples with thicknesses ranging from 5–153 nm. Emphasis is given to the lamellae that form at hydrophilic

Quantifying Lithium Salt and Polymer Density Distributions in Nanostructured Ion-Conducting Block Polymers

March 13, 2018

Author(s)

III Gartner, Melody A. Morris, Cameron K. Shelton, Joseph Dura, III Epps

Block polymer (BP) electrolytes offer significant advantages relative to existing liquid or polymer electrolytes due to their independently tunable ion transport and mechanical stability properties as a result of nanoscale of self-assembly. Many of these

Unraveling the Complex Hydration Behavior of Ionomers Under Thin Film Confinement

January 16, 2018

Author(s)

Shudipto K. Dishari, Christopher A. Rumble, Mark Maroncelli, Joseph Dura, Michael A. Hickner

Ionomers in thin films behave differently from bulk membranes and their behavior is not well understood. Here, thin films (25-250 nm) of sulfonated Radel (S-Radel) were investigated to understand thickness and hydration effects on the density and

Perovskite Nickelates as Electric-Field Sensors in Salt Water

January 4, 2018

Author(s)

Zhen Zhang, Derek Schwanz, Badri Narayanan, Michele Kotiuga, Joseph Dura, Mathew Cherukara, Hua Zhou, John W. Freeland, Jiarui Li, Ronny Sutarto, Feizhou He, Chongzhao Wu, Jiaxin Zhu, Yifei Sun, Koushik Ramadoss, Stephen S. Nonnenmann, Nanfang Yu, Riccardo Comin, Karin M. Rabe, Subramanian K.R.S. Sankaranarayanan, Shriram Ramanathan

Although oceans comprise over seventy percent of our planet, they are among the least understood ecosystems. Complex three-dimensional marine environments hold important clues into long term effects of climate change, evolutionary consequences, and animal

Self-assembled Layering of Magnetic Nanoparticles in a Ferrofluid onSilicon Surfaces

January 4, 2018

Author(s)

Katharina Theis-Brohl, Erika C. Vreeland, Andrew Gomez, Dale L. Huber, Apurve Saini, Max Wolff, Brian B. Maranville, Erik Brok, Kathryn L. Krycka, Joseph Dura, Julie Borchers

This article describes the 3D self-assembly of monodisperse colloidal magnetite nanoparticles from a dilute water-based ferrofluid onto a silicon surface and the dependence of the resultant magnetic structure with applied field. The nanoparticles assemble

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