Wayne F. Reed

Tulane University

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Alina M. Alb

Robert Bosch (Germany)

Michael F. Drenski

Tulane University

Aide Wu

Tulane University

Christopher E. Reed

Tulane University

Curtis W. Jarand

Tulane University

HÇ

Huceste Çatalgil‐Giz

Istanbul Technical University

Terry McAfee

Washington State University

Thomas Zekoski

Tulane University

Emmanuel Mignard

Institut des Sciences Moléculaires

Tomasz Kreft

Tulane University

Cooperative Institutions

Tulane University

Centre National de la Recherche Scientifique

Universidade de São Paulo

University of Minnesota

Rutgers, The State University of New Jersey

University of Massachusetts Amherst

University of New Orleans

Universidade Federal de Santa Catarina

The University of Texas at Austin

Carnegie Mellon University

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Toxicity assessment of a novel oil dispersant based on silica nanoparticles using Fathead minnow

Aquatic Toxicology (2020)

Hajime G. Kurita-Oyamada Caroline L. Brown Kevin J. Kroll Susan E. Walley Christopher B. Keller

Pimephales promelas

Fraction (chemistry)

Aquatic toxicology

10.1016/j.aquatox.2020.105653

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Citations (10)

Effect of Urea on Biomimetic Systems: Neither Water 3-D Structure Rupture nor Direct Mechanism, Simply a More “Polar Water”

Langmuir (2001)

Luís Gustavo Dias F Florenzáno Wayne F. Reed Maurı́cio S. Baptista Silvia M. B. Souza

Analysis of a variety of properties of supramolecular aggregates in aqueous urea supports an explanation for the urea effect that differs from traditional explanations based on the direct mechanism of urea−water solvation or the indirect mechanism via rupture of the three-dimensional (3-D) structure of water. The urea-induced effects investigated are increases in amphiphile critical micelle concentrations, ionization degrees (α), and aggregation numbers; decreases in percolation thresholds of reversed micelles; expansion of minimum areas of monolayers; increases in the radii of gyration of polyelectrolytes; changes in morphologies of sodium bis-2-ethylhexylsulfosuccinate thin films on glass substrates; and direct evidence for urea-induced reduction in ion pairing. All of these effects are attributed to an urea-induced enhancement of the hydrophilic properties of water that results in more strongly solvated polar groups and ions and a reduction in ion pair formation. The implications of this analysis for urea effects on protein 3-D structure are briefly highlighted.

Solvation shell

10.1021/la010176u

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Citations (64)

Online DEKF for State Estimation in Semi-Batch Free-Radical Polymerization Reactors

Computer-aided chemical engineering/Computer aided chemical engineering (2017)

Santiago D. Salas Navid Ghadipasha Wenbo Zhu José A. Romagnoli Terry McAfee

Batch processing

Molar mass distribution

Bulk polymerization

10.1016/b978-0-444-63965-3.50246-4

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Citations (4)

Estudo da dissolução de polieletrólitos em água pura e em meios de força iônica moderada

Polímeros (1999)

Ricardo C. Michel Cristina T. Andrade Wayne F. Reed

O processo de dissolução de polieletrólitos em pó foi monitorado pela passagem da amostra através de um filtro em linha, um detector de espalhamento de luz multi-ângulo, um refratômetro e um viscosímetro capilar. Quando os polieletrólitos foram dissolvidos em soluções de força iônica moderada, o seu comportamento de dissolução foi similar ao de polímeros neutros. No entanto, quando dissolvidos em água pura, uma pequena população de agregados surgiu no início do processo de dissolução. A conformação dos agregados evoluiu desde uma distribuição gaussiana esféricamente simétrica de densidade de massa até estruturas similares a novelos aleatórios, contendo diversas cadeias. Ao final do processo de dissolução, as cadeias de polieletrólito se encontravam rígidas, distendidas e bem dispersas.

10.1590/s0104-14281999000400024

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Citations (0)

Automatic, simultaneous control of molar mass and composition in free radical copolymerization using ACOMP/CI

Wayne F. Reed Terry McAfee Thomas Zekoski Aide Wu Curt Jarand

Molar mass

Source

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Citations (0)

Effect of Valence and Chemical Species of Added Electrolyte on Polyelectrolyte Conformations and Interactions

Macromolecules (2003)

Gina A. Sorci Wayne F. Reed

The effect of added electrolyte (AE) valence and species on polyelectrolytes was studied using automatic, continuous mixing (ACM), allowing measurements over composition gradients. The second virial coefficient A2 was decomposed into contributions from an electrostatically sensitive mean-square gyration radius 〈S2〉 and an external electrostatic field. 〈S2〉 matched predictions of combined electrostatic persistence length and excluded-volume theories, without adjustable parameters. A2 was modeled via an equivalent, soft-core, expansible, charged sphere. Whereas the scaling behavior of 〈S2〉, intrinsic viscosity [η], and A2 was the same for all AE, the prefactors strongly depended on AE symmetry and valence. At given ionic strength 〈S2〉, [η], A2, effective linear charge density, and expansible sphere surface potential are less for divalent than monovalent AE. Different ion species for a given valence class showed second-order effects following a Hoffmeister series. ACM should also prove valuable for investigating AE-induced phase transitions in polyelectrolytes like DNA and proteins.

Radius of gyration

Persistence length

Divalent

Electrostatics

10.1021/ma035551z

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Citations (18)

High osmotic stress behavior of hyaluronate and heparin

Biopolymers (1992)

Robert M. Peitzsch Wayne F. Reed

Abstract Using polyethylene glycol and dextran as osmotic stressing agents, the concentrations of hyaluronate and heparin were measured as a function of osmotic pressure II over the range of 0.03 to nearly 50 atmospheres. The experimental results were analyzed in terms of the Donnan osmotic pressure, the virial expansion, and Flory's first neighbor interaction parameter. In addition, II was looked at as a function of the reciprocal cube root of the concentration, which represents an average intermonomer spacing at high concentrations. The decay lengths in the so‐called hydration region were found to be around 2.6 Å and negligibly salt dependent. In the electrostatically dominated region the decay lengths were found to be dependent on the ionic strength, but not simply so. The osmotic compressibilities were also calculated, and were compared to compressibility data of corneal stroma and articular cartilage. These latter compressibilities were close to those for the pure hyaluronate and heparin, strengthening the evidence that glycosaminoglycans (GAGs) are largely responsible for connective tissue compressibility. Higher compressibilities for previously reported GAG data is thought to be related to the protein content of those samples.

Osmotic shock

10.1002/bip.360320304

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Citations (24)

ChemInform Abstract: CLEFT FORMATION UPON POLYMERIZATION OF SURFACTANT VESICLES

Chemischer Informationsdienst (1985)

Faruk Nome Wayne F. Reed Mário José Politi Pietro Tundo János H. Fendler

Abstract Vesikel aus (I) besitzen einen hydrodynamischcn Radius von 425 Å (Laserstreuung) und ein mittleres Molekulargewicht von 2.3‐ 107, die sich durch Photopolymerisation nicht ändern.

Extracellular Vesicles

10.1002/chin.198518054

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Citations (0)

Device and methods for determination of molecular weight distributions of polymers and distributions of other polymer properties without physical separation

OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (2022)

Wayne F. Reed R. D. Montgomery Michael Felix Drenski Aide Wu

Separation (statistics)

Molar mass distribution

Source

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Apparent persistence lengths and diffusion behavior of high molecular weight hyaluronate

Biopolymers (1990)

Snehasish Ghosh Xiao Li Christopher E. Reed Wayne F. Reed

Abstract High purity, high molecular weight hyaluronate from bacteria and rooster comb exhibited clear polyelectrolyte properties, as observed by static and dynamic light scattering. The scattered intensity of hyaluronate solutions increased markedly with ionic strength, while the radii of gyration decreased. Apparent persistence lengths within the wormlike chain model in the coil limit were estimated as a function of ionic strength. The total apparent persistence length varied from about 87 Å in the high ionic strength limit to nearly 400 Å at 1 m M added NaCl. The apparent electrostatic persistence length varied approximately as the inverse square root of the ionic strength. Deviations from the theoretically predicted inverse ionic strength dependence were investigated in terms of excluded volume effects. Dynamic light scattering yielded “ordinary phase” diffusion coefficients whose dependence on polymer and salt concentration agreed reasonably well with hydrodynamic coupled mode theory in the linear limit. Extrapolations to infinite polymer dilution at fixed salts yielded, surprisingly, a constant diffusion coefficient. Thus, there was no evidence of either polyion expansion or electrolyte friction effects in the infinite dilution diffusion coefficients. Since clear evidence for polyion expansion was seen in the static scattering, it is thought that the relative stiffness and consequent openness of the hyaluronate coils lead to partial free draining behavior. There was no evidence for an “extraordinary phase” under no added salt and low added salt conditions. The overall results are contrasted with the very different behavior previously reported for medium purity hyaluronate from animal sources.

Persistence length

Dilution

Radius of gyration

10.1002/bip.360301110

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Citations (97)