Publications

Displaying 1 - 9 of 9

Shaped Magnetogel Microparticles for Multispectral Magnetic Resonance Contrast and Sensing

December 19, 2023

Author(s)

Samuel Oberdick, Stephen Dodd, Alan Koretsky, Gary Zabow

A promising form of magnetic resonance imaging (MRI) contrast, known as multispectral or "color" contrast, encodes protons with discrete frequencies (i.e., colors) using micro-engineered control of magnetic fields. Manipulation of local magnetic fields is

Iron Oxide Nanoparticles as Positive T1 Contrast Agents for Low-Field Magnetic Resonance Imaging at 64 mT

July 17, 2023

Author(s)

Samuel Oberdick, Kalina Jordanova, John Lundstrom, Giacomo Parigi, Megan Poorman, Gary Zabow, Katy Keenan

We have investigated the efficacy of superparamagnetic iron oxide nanoparticles (SPIONs) as positive T1 contrast agents for low-field magnetic resonance imaging (MRI) at 64 millitesla (mT). Iron-oxide based agents, such as the FDA-approved ferumoxytol

Towards a barrier-free anthropomorphic brain phantom for quantitative magnetic resonance imaging: Design, first construction attempt, and challenges

July 12, 2023

Author(s)

Mikail Kraft, Slavka Ryger, Ben Berman, Matthew Downs, Kalina Jordanova, Megan Poorman, Samuel Oberdick, Stephen Ogier, Stephen E. Russek, Katy Keenan

Magnetic Correlations of Iron Oxide Nanoparticles as Probed by Polarized SANS in Stretched Magnetic Nanoparticle-Elastomer Composites

January 31, 2022

Author(s)

Samuel Oberdick, Kathryn L. Krycka, Julie Borchers

We have investigated the magnetic correlations among 7 nm iron oxide nanoparticles embedded in stretched silicone elastomers using polarized Small Angle Neutron Scattering (SANS). The magnetic nanoparticle (MNP)-elastomer composite can be stretched during

Observation of iron oxide nanoparticle growth in magnetogels using magnetic resonance imaging

April 9, 2020

Author(s)

Samuel D. Oberdick, Stephen E. Russek, Megan E. Poorman, Gary Zabow

We show that magnetic resonance imaging (MRI) can be used to visualize the spatiotemporal dynamics of iron oxide nanoparticle growth within a hydrogel network during in situ coprecipitation. The synthesis creates a magnetic nanoparticle loaded polymer gel

Patterned Surface Energy in Elastomeric Molds as a Generalized Approach to Polymer Particle Fabrication

January 2, 2020

Author(s)

Samuel D. Oberdick, Gary Zabow

We present a generic fabrication scheme to produce polymer microparticles with engineerable, complex shapes. The polymer particles are made from a polyethylene-glycol based hydrogel using a polydimethylsiloxane (PDMS) based molding technique. A simple

Correlated Spin Canting in Ordered Core-Shell Fe 3 O 4 /Mn x Fe 3-x Od4^ Nanoparticle Assemblies

March 18, 2019

Author(s)

Y. Ijiri, Kathryn L. Krycka, I. Hunt-Isaak, H. Pan, J. Hsieh, Julie Borchers, James Jennings Rhyne, Samuel D. Oberdick, A. Abdelgawad, S. A. Majetich

Polarization-analyzed small-angle neutron scattering methods are used to determine the spin arrangements in ordered three-dimensional assemblies of 7.4 nm diameter core-shell Fe 3O 4/Mn xFe 3-xO 4 nanoparticles. In moderate to high magnetic fields, the

Spin Waves Across Three-Dimensional, Close-Packed Nanoparticles

December 21, 2018

Author(s)

Kathryn Krycka, James Jennings Rhyne, Samuel D Oberdick, Ahmed M. Abdelgawad, Julie A. Borchers, Yumi Ijiri, Sara A. Majetich, Jeffrey W. Lynn

Inelastic neutron scattering is utilized to measure the spin waves, or magnons, which arise from inter-particle coupling between 8.4 nm ferrite nanoparticles that are self-assembled into a close-packed lattice, yet physically separated by oleic acid

Spin Canting Across Core/Shell Fe 3 O 4 /Mn x Fe 3-x O 4 Nanoparticles

February 21, 2018

Author(s)

Samuel D. Oberdick, Ahmed Abdelgawad, Carlos Moya, Samaneh Mesbahi-Vasey, Demie Kepaptsoglou, Vlado K. Lazarov, Richard F. L. Evans, Daniel Meilak, Elizabeth Skoropata, Johan van Lierop, Ian Hunt-Isaak, Hillary Pan, Yumi Ijiri, Kathryn L. Krycka, Julie Borchers, Sara A. Majetich

Core/shell Fe 3dO 4/Mn xFe 3-xO 4 nanoparticles were synthesized in a single reaction using molecular precursors with different thermal stability. Scanning transmission electron microscopy combined with electron energy loss spectroscopy confirms the core

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