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9 Newest Publications about the topic sec columns

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Evidences of Long‐Chain Branching in Ziegler‐Natta Polyethylene Homopolymers as Studied via SEC‐MALS and Rheology

23-Aug-2013 | Youlu Yu, David C. Rohlfing, Macromolecular Symposia, 2013

Summary Comprehensive polymer architectural studies were carried out on a group of Ziegler‐Natta (Z‐N) polyethylene homopolymers via size‐exclusion chromatography coupled with multi‐angle light scattering (SEC‐MALS) and rheology. Although Z‐N resins are traditionally viewed as linear ...

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Liquid Chromatography of Synthetic Polymers under Critical Conditions of Enthalpic Interactions 4. Sample recovery

16-Jul-2013 | Alena Šišková, Eva Macová, Danilo Corradini, Dušan Berek, Journal of Separation Science, 2013

Reduced sample recovery is a frequent feature of liquid chromatography of macromolecules under critical conditions of enthalpic interactions, LC CC. Several methods of assessment of LC CC sample recovery are compared. A novel approach is based on an online combination of the LC CC column with a ...

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Ultra‐high‐performance size‐exclusion chromatography of synthetic polymers. 1. Demonstration of capability

02-Jul-2013 | Miroslav Janco, James N. Alexander, Edouard S. P. Bouvier, Damian Morrison, Journal of Separation Science, 2013

Ultra‐high‐performance size‐exclusion chromatography (UHP SEC) is a newly developed disruptive technology that allows the high‐resolution separation of synthetic polymers in as little as two minutes. The capability of UHP SEC for the characterization of synthetic polymers in both organic ...

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Multi-walled carbon nanotubes — Solid phase extraction for isolating marine dissolved organic matter before characterization by size exclusion chromatography

23-Apr-2012 | Juan Sánchez-González, Natalia García-Otero, Antonio Moreda-Piñeiro, Pilar Bermejo-Barrera, Microchemical Journal, 2012

The feasibility of multi-walled carbon nanotubes (MWCNTs) for extracting dissolved organic matter (DOM) from seawater has been investigated. Solid phase extraction (SPE) operating in column and batch modes was used as an extractive technique, and the latter mode offered better performance. DOM ...

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Complexation of Arsenite with Humic Acid in the Presence of Ferric Iron

15-Feb-2011 | Guangliang Liu; Aymara Fernandez; Yong Cai, Environmental Science & Technology, 2011

In the presence of iron (Fe), dissolved organic matter (DOM) may bind considerable amounts of arsenic (As), through formation of Fe-bridged As−Fe-DOM complexes and surface complexation of As on DOM-stabilized Fe-colloids (collectively referred to as As−Fe-DOM complexation). However, direct (e.g., ...

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Mechanistic discussion of cationic crosslinking copolymerizations of 1,2‐epoxycyclohexane with diepoxide crosslinkers accompanied by intramolecular and intermolecular chain transfer reactions

15-Oct-2010 | Katahira, Chisato; Morishita, Nobuya; Ikeda, Jun‐Ichi; Lim, Pang Boey; Inoue, Mitsuteru; Iwasaki, Yuri; Aota, ..., Journal of Polymer Science Part A: Polymer Chemistry, 2010

Our previous mechanistic discussion of the free‐radical crosslinking monoallyl/diallyl copolymerizations was extended to the cationic crosslinking monoepoxide/diepoxide copolymerizations, typically including 1,2‐epoxycyclohexane (ECH) as a monoepoxide and bis[3,4‐epoxycyclohexylmethyl] adipate ...

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Human Plasma Copper Proteins Speciation by Size Exclusion Chromatography Coupled to Inductively Coupled Plasma Mass Spectrometry. Solutions for Columns Calibration by Sulfur Detection

19-Jul-2010 | Souleiman El Balkhi; Joël Poupon; Jean-Marc Trocello; France Massicot; France Woimant; Olivier Laprévote, Analytical Chemistry, 2010

Among the hyphenated techniques used to probe and identify metalloproteins, size exclusion chromatography coupled to inductively coupled plasma mass spectrometry (SEC-ICP-MS) has shown to have a central place. However, the calibration of SEC columns reveals to be tedious and always involves UV ...

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Using SEC for Analyzing the Sizes of Au/Pt Core/Shell Nanoparticles

26-Jun-2010 | Fu-Ken Liu, Chromatographia, 2010

This paper describes the use of size-exclusion chromatography (SEC) to characterize the sizes of fabricated Au/Pt core/shell nanoparticles (NPs), which were monitored using a polymer-based SEC column (pore size: ca. 400 nm) and a mobile phase of 10 mM sodium dodecyl sulfate (SDS). The plot of the ...

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Effects of sample properties and mass spectroscopic parameters on electrospray ionization mass spectra of size-fractions from a soil humic acid

18-Jun-2010 | A. Piccolo, M. Spiteller, A. Nebbioso, Analytical and Bioanalytical Chemistry, 2010

Size-fractions from a soil humic acid were separated by preparative size-exclusion chromatography (SEC), desalted, and concentrated by ultrafiltration and vacuum centrifugation without being subjected to any freeze-drying process. After having assessed the lack of formation of any ...

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