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Search Publications by: Kathleen Weigandt (Fed)

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Displaying 1 - 19 of 19

Biodegradable Zwitterionic Poly(Carboxybetaine) Microgel for Sustained Delivery of Antibodies with Extended Stability and Preserved Function

June 2, 2021
Amir Erfani, Abanoub Hanna, Payam Zarrintaj, Saeed Manouchehri, Katie Weigandt, Clint P. Aichele, Joshua D. Ramsey
Many recent innovative treatments are based on monoclonal antibodies (mAbs) and other protein therapies. Nevertheless, sustained subcutaneous, oral or pulmonary delivery of such therapeutics are limited by the poor stability, short half-life, and non

Multiscale Microstructure, Composition, and Stability of Surfactant/Polymer Foams

December 8, 2020
Stefania Perticaroli, Jana Herzberger, Yiping Sun, Jonathan D. Nickels, Ryan Murphy, Kathleen Weigandt, Paula J. Ray
Foam stability is a critical part of product performance and consumer experience in materials as diverse as beer or detergents. Inclusion of polymer additives is a known strategy to improve foam stability, but questions persist about the amount of polymer

Correlating Inter-Particle Forces and Particle Shape to Shear-Induced Aggregation/Fragmentation and Rheology for Dilute Anisotropic Particle Suspensions: A Complementary Study via Capillary Rheometry and in situ small and Ultra-Small Angle X-ray Scatterin

September 15, 2020
Anthony J. Krzysko, Elias Nakouzi, Xin Zhang, Trent R. Graham, Kevin M. Rosso, Gregory K. Schenter, Jan Ilavsky, Ivan Kuzmenko, Matthew G. Frith, Cornelius F. Ivory, Sue B. Clark, Javen S. Weston, Kathleen Weigandt, James J. De Yoreo, Jaehun Chun, Lawrence M. Anovitz
Predicting the stability of suspensions composed of anisotropic particles is difficult due to the complexity and interplay of hydrodynamic and colloidal forces. For example, it is not well understood how non-spherical particle shapes affect suspension

Capillary RheoSANS: Measuring the Rheology and Nanostructure of Complex Fluids at High Shear Rates

July 15, 2020
Ryan P Murphy, Zachary W. Riedel, Marshall A. Nakatani, Paul Salipante, Javen S. Weston, Steven D. Hudson, Kathleen M Weigandt
Complex fluids containing micelles, proteins, polymers and inorganic nanoparticles are often processed and used in high shear environments that can lead to structural changes at the nanoscale. Here, capillary rheometery is combined with small-angle neutron

Color, Structure, and Rheology of a Diblock Bottlebrush Copolymer Solution

June 7, 2020
Matthew A. Wade, Dylan Walsh, Johnny Ching-Wei Lee, Elizabeth Kelley, Kathleen Weigandt, Damien Guironnet, Simon A. Rogers
A structure-property-process relation is established for a diblock bottlebrush copolymer solution, through a combination of rheo-neutron scattering, imaging, and rheological measurements. Polylactic acid-b-polystyrene diblock bottlebrush copolymers were

Pipe Flow of Sphere Suspensions having a Power-Law-Dependent Fluid Matrix

March 5, 2020
Nicos Martys, William L. George, Ryan P Murphy, Kathleen M Weigandt
Measurement and prediction of suspension flow properties in cylindrical geometries represents a significant challenge for both the experimentalist and modeller. In this paper, results of a computational study of suspension flow in a pipe geometry using a

Structure and Dynamics of Spherical and Rodlike Alkyl Ethoxylate Surfactant Micelles Investigated using NMR Relaxation and Atomistic Molecular Dynamics Simulations

October 29, 2019
Allison Talley Edwards, Abdolreza Javidialesaadi, Kathleen Weigandt, George Stan, Charles D. Eads
Predicting and controlling the properties of amphiphile aggregate mixtures requires understanding the arrangements and dynamics of the constituent molecules. To explore these topics, we study molecular arrangements and dynamics in alkyl ethoxylate nonionic

Strain Shifts under Stress-controlled Oscillatory Shearing in Theoretical, Experimental and Structural Perspectives: Application to Probing Zero-Shear Viscosity

September 23, 2019
Johnny Ching-Wei Lee, Yu-Tong Hong, Kathleen Weigandt, Elizabeth Kelley, Hyunjoon Kong, Simon A. Rogers
Strain response under stress-driven oscillatory shearing could shift from the origin. The phenomenology is experimentally confirmed with entangled polymer-like micelles and polyethylene oxide solutions. A theory of strain shifting is provided based on the

Simultaneous Slit Rheometry and In Situ Neutron Scattering

March 1, 2018
Javen Scott Weston, Daniel P. Seeman, Daniel L. Blair, Paul Salipante, Steven Hudson, Kathleen Weigandt
In situ measurement of fluid structure during flow, e.g., by neutron scattering, is key to understanding the relationship between structure and rheology. For some applications, structures at high shear rates heretofore unreachable are of particular

New Insights into the Flow and Microstructural Relaxation Behavior of Biphasic Cellulose Nanocrystal Dispersions from RheoSANS

December 7, 2017
Alexander D. Haywood, Kathleen Weigandt, Partha Saha, Matthew Noor, Micha J. Green, Virginia A. Davis
Understanding microstructure and shear response is a prerequisite for the controlled and predictable assembly of anisotropic nanomaterials into large area structures. Much of the framework for understanding the rheological behavior of lyotropic dispersions

Acid-Induced Assembly of a Reconstituted Silk Protein System

August 10, 2017
A. Pasha Tabatabai, Kathleen Weigandt, Daniel L. Blair
The chemical reconstitution of silk cocoons into stable aqueous suspensions allows for the creation of new classes of strong, biocompatible, and biodegradable silk materials. The addition of 8 mM hydrochloric acid to a reconstituted silk solution induces

Effect of Interlamellar Interactions on Shear Induced Multilamellar Vesicles Formation

July 21, 2017
Youhei Kawabata, Robert David Bradbury, S. Kugizaki, Kathleen Weigandt, Y. B. Melnichenko, K. Sadakane, N. L. Yamada, H. Endo, Michihiro Nagao, H. Seto
Shear-induced multilamellar vesicle (MLV) formation has been studied by means of small-angle neutron scattering (SANS) technique coupled with neutron spin echo (NSE) spectroscopy. A mass fraction of 10% of nonionic surfactant pentaethylene glycol dodecyl

Scattering Studies on Poly(3,4-ethylenedioxythiophene) Polystyrenesulfonate in the Presence of Ionic Liquids

December 22, 2015
Ryan J. Murphy, Kathleen Weigandt, David Uhrig, Ahmed Alsayed, Chantal Badre, Larry Hough, Murugappan Muthukumar
The demand for lower-cost and flexible electronics has driven industry to develop alternative transport electrode (TE) materials to replace Indium Tin Oxide (ITO). ITO is the benchmark TE on the market, but its high cost and low flexibility limits it for

Quantifying "Softness" of Organic Coatings on Gold Nanoparticles using Correlated Small-Angle X-Ray and Neutron Scattering

December 9, 2015
Benjamin T. Diroll, Kathleen Weigandt, Davit Jishkariani, Matteo Cargnello, Ryan J. Murphy, Lawrence A. Hough, Christopher B. Murray, Bertrand Donnio
Small angle X-ray and neutron scattering provide powerful tools to selectively characterize the inorganic and organic components of hybrid nanomaterials. Using hydrophobic gold nanoparticles coated with several commercial and dendritic thiols, the size of