Publications

Displaying 1 - 8 of 8

Polyzwitterion fast and slow mode behavior are coupled to phase separation as observed by dynamic laser light scattering

September 11, 2023

Author(s)

Phillip Pickett, Yuanchi Ma, Vivek Prabhu

A model zwitterionic polysulfobetaine, poly(3-(acrylamidopropyl-dimethyl-ammonium) propyl-1-sulfonate) (pAPAPS), phase separates upon cooling with upper critical solution temperature (UCST) behavior with no added salt in deuterium oxide solutions

Applicability of Generalized Stokes Einstein Equation of Mode-Coupling Theory to Near-Critical Polyelectrolyte Complex Solutions

February 10, 2023

Author(s)

Yuanchi Ma, Steven D. Hudson, Paul Salipante, Jack F. Douglas, Vivek Prabhu

We examine whether the mode-coupling theory of Kawasaki and Ferrell1,2 (KF) can describe the wavevector-dependent collective diffusion coefficient in near-critical polyelectrolyte complex coacervate solutions that have previously been shown to exhibit

Temperature Dependent Single-Chain Structure of Poly(3-(acrylamidopropyl-dimethyl-ammonium) propyl-1-sulfonate) via SANS

June 2, 2022

Author(s)

Phillip Pickett, Yuanchi Ma, Michael Lueckheide, Yimin Mao, Vivek Prabhu

Responsive polyzwitterionic materials have become important for a range of applications such as environmental remediation and targeted drug delivery. Much is known about the macroscopic phase-behaviors of such materials but how the smaller scale single

Chapter: Structure and phase behavior of polyampholytes and polyzwitterions

March 4, 2022

Author(s)

Phillip Pickett, Yuanchi Ma, Vivek Prabhu, Michael Lueckheide, Nicholas Posey

Polyelectrolytes contain many units of charged moieties, often as either anionic or cationic. However, when a polymer comprises both anionic and cationic monomers, the result is a polyampholyte. Polyzwitterions are a type of polyampholyte that contain

Enhanced Concentration Fluctuations in Model Polyelectrolyte Coacervate Mixtures along a Salt Isopleth Phase Diagram

December 8, 2021

Author(s)

Vivek Prabhu, Yuanchi Ma, Samim Ali

A temperature (T) versus polymer concentration (cp) representation leads to non-overlapping coexistence curves prepared from different initial polymer concentrations along a salt isopleth of aqueous mixtures of charge-stoichiometric, oppositely-charged

Tuning Net Charge in Aliphatic Polycarbonates Alters Solubility and Protein Complexation Behavior

August 26, 2021

Author(s)

Nicholas D. Posey, Julia Danischewski, Michael Lueckheide, Yuanchi Ma, Jeffrey Fagan, Vivek Prabhu

A synthetic strategy yielded polyelectrolytes and polyampholytes with tunable net charge for complexation and protein binding. Organocatalytic ring-opening polymerizations yielded aliphatic polycarbonates that were functionalized with both carboxylate and

Molecular Mass Dependence of Interfacial Tension in Complex Coacervation

June 11, 2021

Author(s)

Debra Audus, Samim Ali, Artem Rumyantsev, Yuanchi Ma, Juan J. de Pablo, Vivek Prabhu

The interfacial tension of coacervates, the liquidlike phase composed of oppositely charged polymers that coexists at equilibrium with a supernatant, forms the basis for multiple technologies. Here we present a comprehensive set of experiments and

Ultra-small angle neutron scattering to study droplet formation in polyelectrolyte complex coacervates

July 25, 2020

Author(s)

Vivek Prabhu, Yimin Mao, Markus Bleuel, Samim Ali, Yuanchi Ma

Associating soft matter such as surfactants, polymers, proteins, and liposomes, may form structures with dimensions not readily accessible by optical methods. Scattering methods can provide detailed information about the mechanism of associative phase

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