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Biotechnology Progress, EarlyView.This work describes the development of human hemoglobin nanoparticles using an anti‐solvent precipitation synthesis method as a potential next generation hemoglobin‐based oxygen carrier. The hemoglobin nanoparticles are uniform in size and shape, hemocompatible, stable at various storage conditions, and demonstrate a scalable synthesis technique ...
Alisyn Greenfield, Andre F. Palmer
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Polydispersity index of polymers revealed by DOSY NMR
Journal of Magnetic Resonance, 2011The polydispersity of a polymer chain is usually measured by its polydispersity index (PDI). In this study we present a method which allows to estimate the PDI of linear polymers from a simple diffusion experiment. The approach is based on the differential diffusion profile observed for the main polymer chain signal versus the extremity signal.
Justine, Viéville +2 more
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Polydispersity index and molecular weight distributions of polymers
European Polymer Journal, 1996The polydispersity index as a measure of the width of molecular weight distributions (MWD) is theoretically very important. However, considering the real polymer MWDs, its importance is partly lost. Consequently, several problems arise. The most common one is the misinterpretation of polydispersity index as a single and unique measure of MWD width.
Rogošić, Marko +2 more
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Isolation of lignosulfonate with low polydispersity index
Chinese Chemical Letters, 2010Abstract Lignosulfonate with low polydispersity index of 1.178–1.210 was isolated by gel column chromatography of Sephacryl S-100 eluted with 0.2 mol/L of NaNO3 aqueous solution, whereas nearly monodisperse ligosulfonate fraction with polydispersity of 1.067 can be obtained after chromatographic separation twice.
Xin Ping Ouyang +5 more
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Lab on a Chip, 2008
The influence of interdigital multilamination micromixer characteristics on monomer conversions, molecular weights and especially on the polydispersity index of block copolymers synthesized continuously in two microtube reactors is investigated. The micromixers are used to mix, before copolymerization, a polymer solution with different viscosities and ...
Carine, Rosenfeld +3 more
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The influence of interdigital multilamination micromixer characteristics on monomer conversions, molecular weights and especially on the polydispersity index of block copolymers synthesized continuously in two microtube reactors is investigated. The micromixers are used to mix, before copolymerization, a polymer solution with different viscosities and ...
Carine, Rosenfeld +3 more
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Determination of molar mass polydispersity index from dynamic rheological measurements
Rheologica Acta, 1986The polydispersity of the molar mass of a material influences the behaviour of its dynamic rheological propertiesG′ (ω) andG″ (ω). This is exemplified by the deviation from unity of the indexI = [2 − (d logG′/d logω)]/[1 − (d logG″/d logω)] in the terminal zone, i.e. at low frequencies.
G. Couarraze +2 more
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Evaluation of polydispersity index Mw/Mn by quasielastic light scattering
Collection of Czechoslovak Chemical Communications, 1987The response of quasielastic light scattering to the polydispersity of scattering objects has been investigated. A new method of the polydispersity index determination has been suggested, suitable for the range 1.02 ⪬ Mw/Mn ⪬ 2.0 and consisting in the measurement of the dependence of the apparent decay time on the correlator sampling time.
Petr Štěpánek +2 more
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The research of preparation of polyvinyl acetate with lower polydispersity index
Journal of Applied Polymer Science, 2008AbstractIn this study, the way of preparing polyvinyl acetate (PVAc) with lower polydispersity index (PDI) was studied. By adding small amount of monomer with polar group, such as acrylic acid (AA), α‐methacrylic acid (MAA), or acrylamide (AM), as modulation monomer, the polymerization was carried out at 65°C with a mechanical agitator using AIBN as ...
Haike Feng, Long Jiang, Yi Dan
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Refractive index matching of large polydisperse silica spheres in aqueous suspensions
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2018Abstract Standard synthesis protocols produce silicon dioxide (SiO2) particles with an inhomogeneous material distribution, which defines their optical properties. The inner structure and effective refractive index of the particles can be investigated by light scattering and optical contrast variation techniques.
Gualberto J. Ojeda-Mendoza +2 more
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Effect of Polydispersity Index on the Grinding Limits of Highly Concentrated Limestone Suspensions
Chemical Engineering & Technology, 2014AbstractThe impact of polydispersity index (PDI) values and doses of two sodium polyacrylates on grinding limits and particle size distributions of highly concentrated limestone suspensions was studied. The results indicated that viscosity and agglomerate particle size, and thus the apparent grinding limit, depended on the sodium polyacrylate dose as ...
Katja Ohenoja +5 more
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