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Search Publications by: Andre Striegel (Fed)

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Displaying 1 - 25 of 40

Characterizing Styrene Monomer and Oligomers by SEC/MALS/VISC/DRI

January 10, 2024
Author(s)
Andre Striegel
Worldwide polystyrene (PS) production in 2020 was approximately 27 million metric tons, distributed among many nations, making it one of the most heavily imported and exported chemicals. Commercially produced PS usually possesses a broad molar mass

Size-exclusion chromatography

April 20, 2023
Author(s)
Andre Striegel
Over the past half-century, size-exclusion chromatography (SEC) has become the premier method by which to determine the molar mass (M) averages and the molar mass distribution (MMD) of natural and synthetic macromolecules. When coupled to a multiplicity of

Size-Exclusion Chromatography: A twenty-first Century Perspective

April 4, 2022
Author(s)
Andre Striegel
Now in its sixth decade, size-exclusion chromatography (SEC) remains the premier method by which to determine the molar mass averages and distributions of natural and synthetic macromolecules. Aided by its coupling to a variety and multiplicity of

Peak Fraction Purity and Chromatographic Resolution: Gaussian Peaks Revisited

January 19, 2022
Author(s)
Andre Striegel, Deborah Striegel
For incompletely resolved peak pairs, the purity of the chromatographic or fractographic fractions is oftentimes underestimated by the common user. This results in wasted time and effort while trying to achieve higher resolution than needed for the

Entropic-based separation of diastereomers. Size-exclusion chromatography with on-line viscometry and refractometry detection for analysis of blends of mannose and galactose methyl-alpha-pyranosides at "ideal" size-exclusion conditions

January 11, 2021
Author(s)
Andre M. Striegel, Steven Trainoff
TThe separation of carbohydrate diastereomers by an ideal size-exclusion mechanism, i.e., in the absence of enthalpic contributions to the separation, can be considered one of the grand challenges in chromatography: Can a difference in the location of a

Method development in interaction polymer chromatography

September 1, 2020
Author(s)
Andre M. Striegel
Interaction polymer chromatography (IPC) is an umbrella term covering a large variety of primarily enthalpically-dominated macromolecular separation methods. These include temperature- gradient interaction chromatography, interactive gradient polymer

Quantitative characterization of gold nanoparticles by size-exclusion and hydrodynamic chromatography, coupled to inductively coupled plasma mass spectrometry and quasi-elastic light scattering

July 14, 2017
Author(s)
Leena M. Pitkanen, Antonio Montoro Bustos, Karen E. Murphy, Michael R. Winchester, Andre Striegel
The physicochemical characterization of nanoparticles, in general, and of gold nanoparticles (Au NPs), in particular, is of paramount importance for tailoring and optimizing the properties of these materials in specific applications, as well as for

Advances in Next-Generation Polyolefin Standard Reference Materials

May 17, 2017
Author(s)
Sara V. Orski, Wesley S. Farrell, Andre M. Striegel, Kathryn L. Beers
NIST’s approach to modernizing its synthetic polymer reference materials is to target precise and robust synthetic methods, making homogeneous standards than can be easily tailored to include desired chemistry, molar mass, and topography. This strategy

Size-exclusion chromatography of metal nanoparticles and quantum dots

April 8, 2016
Author(s)
Leena M. Pitkanen, Andre Striegel
This review presents an overview of size-exclusion chromatographic separation and characterization of noble metal nanoparticles (NPs) and quantum dots (QDs) over the past 25 years. The properties of NPs and QDs that originate from quantum and surface