10
May/June 2011 Engineering nanoparticle coatings
Researchers working at NanoQAM, the nanotechnology research centre of the University of Quebec, are successfully innovating novel polymer coatings on the basis of data
measured using a Viscotek high temperature gel permeation chromatography (HT-GPC) system from Malvern Instruments. The system is proving crucial for efficient polymer characterisation, reliably providing absolute molecular weight and structural information to support research goals. A dependable high temperature solution is a pre-requisite for the polymers under test, as it is for bulk polyolefins.
“We rely heavily on the Malvern HT-GPC system because of the comprehensive, accurate information it provides,” remared Dr Jerome Claverie, Director of NanoQAM, and Professor at the University of Quebec. ”GPC analysis of our polymers is challenging but the system performs consistently and reliably. Ongoing costs are low because the system is easy to maintain and consumables are affordable, which drives down the ‘cost per injection’, an important
comparative indicator for us. And the software is excellent. It gives us the flexibility we need to fully explore our materials and at the same time allows new users to get useful data with minimal training.”
A key focus of Dr Claverie’s research is the development of polyolefin- based copolymers that are more hydrophilic. The aim is to produce coatings for nanoparticles that combine the mechanical properties of polyethylene with other capabilities, easily taking a dye for example. Studying the molecular weight and branching behaviour of these copolymers uncovers the structure-property relationships necessary to efficiently tailor polymerisation reactions for their production.
Malvern has developed the Viscotek HT-GPC system specifically for polyolefin analysis. These polymers are only sparingly soluble, necessitating the use of high temperatures throughout the analytical cycle. The Viscotek HT-GPC provides a reliable, cost-effective solution for operation at temperatures up to 160oC. The full triple detector configuration delivers absolute molecular weight without extrapolation or correction, molecular size (Rg and Rh), intrinsic viscosity and branching information in a single GPC/SEC experiment.
For more information, visit
www.malvern.com New Sub 2µm Phase with Extended pH Range Capability
Crawford Scientific announces the launch of Triart 1.9 m HPLC columns from YMC Europe. YMC-Triart C18 is a novel, multi-layered, organic/inorganic hybrid particle synthesized with C18 (L1 USP designation). The chemistry of the C18 is enhanced by a multi-stage, multi-compound end-capping process that overcomes the weaknesses of single-step end-capping, and effectively caps essentially all the residual silanol sites that are accessible by analytes.
The chemical stability of the material combines with the inherent mechanical durability of the particles themselves, to contribute to long column lifetime and is available in columns packed with 1.9 m (3 and 5 m) particles which operate over a wide pH range of 1 to 12, enabling the manipulation of analytical retention and preparative loading. Unlike other hybrid materials, YMC-Triart exhibits a more balanced hydrophobicity, making it more retentive than other hybrids, potentially simplifying the separation of "difficult" peaks.
For more information, visit
www.crawfordscientific.com Reversed Phase LC Column Selection Tool and Online Application
Phenomenex, introduces the Reversed Phase Column Screener, a resource that helps chromatographers select the most effective HPLC or UHPLC column for
their methods from the company’s extensive offering. Phenomenex provides a wide range of reversed phase columns, including flagship brands Kinetex®
, Gemini-NX® , Jupiter® , Luna® , Synergi® , Axia™ and
Onyx™. Based on decades of customer support and research, the Reversed Phase Column Screener allows users to search by compound characteristics, pharmacopeia classification, column used, or application. The comprehensive tool provides a convenient way to reference and access application notes on the Phenomenex web site.
When the chromatographer enters compound characteristics, the
Screener will provide primary and secondary recommendations for fully porous particle columns with complementary selectivities, and a core- shell particle option for ultra-high performance. Recommended mobile phase starting conditions are also provided. Users in the United States can order columns directly from this site.
Chromatographers who search by application will find a range of options including amino acids, food additives, veterinary drugs and steroids. Once a relevant application has been identified, a complete method note is provided. Users may also search by USP classification to determine which columns they can use to stay within method guidelines.
“As the only manufacturer to provide fully porous, core-shell and monolithic reversed phase columns, our offering has grown to the point where users may need help in determining which option will give them the very best results,” explained Jeremy Bierman, Brand Manager for Phenomenex. “We have used our experience to create an effective tool that allows chromatographers to conveniently and easily find the ideal reversed phase column for their method.”
For more information, visit
www.phenomenex.com
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52