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About highly polar stationary liquids

The highly polar stationary liquids with the strongest polarity for small molecules is b, b-oxydipropylcyanide, but its temperature resistance is poor, so people studied various high polarity polymers, and polyethylene glycol 20M (i.e. polyethylene glycol with a molecular weight of 20000) was the most commonly used stationary liquids with medium polarity.

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Siloxanes are currently the mainstay of gas chroma

Although there are over a thousand types of gas chromatography stationary liquids that have been used and studied to meet the requirements of low column efficiency and high selectivity in packed columns, however, for modern capillary chromatography columns, these stationary liquids are rarely used in combination.

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Early use of gas chromatography stationary liquids

In 1950, Martin, the inventor of gas chromatography, used diatomaceous earth (Celite) as a carrier, silicone oil (DC 550) as a stationary liquid, and gas as a mobile phase to separate ammonia, fatty amines, and pyridine homologues. DC 550 (methyl polysiloxane containing 25% phenyl) was originally an industrial high-temperature resistant silicone oil.

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The early development of gas chromatography techno

Gas chromatography is an early and mature technology in the field of chromatography. Due to its fast, simple, relatively inexpensive, and good repeatability, it can analyze components in various matrices, such as petroleum and petrochemical products, environmental pollutants, drugs, food, etc. Moreover, because of the inherent high separation efficiency of gas chromatography and its ability to con

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Early stationary phases of gas-solid chromatograph

Porous polymer beads were obtained by Hollis in 1966 through copolymerization of styrene and divinylbenzene, he conducted a detailed study on the chromatographic separation performance of such polymers, calling them Porpak. The Porpak Q he is studying is a gas solid chromatography stationary phase with excellent chromatographic separation performance. Soon various brands of Porous polymer beads st

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The charm of gas-solid chromatography

Most people know that in 1952, Martin and Synge won the Nobel Prize in Chemistry for their invention of gas chromatography, however, the real first gas-solid chromatograph was developed by Erika Cremer and her students at the University of Innsbruck in Austria. During the Second World War from 1944 to 1945, Cremer and her students designed and developed the first gas-solid chromatograph, during th

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Early stationary phases of gas-solid chromatograph

The crystalline structure of molecular sieves has a certain size, and different types of molecular sieves have different sizes. Therefore, the selectivity of molecular sieves is related to the critical size of the separated compound using the type of molecular sieve used. The critical dimension refers to the diameter of the maximum cross-section perpendicular to its length. Molecular sieves have s

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Application of Nanoporous Carbon Balls on Chromato

nano porous carbon spheres have the advantages of monodisperse silica gel and carbon molecular sieve, and have good application prospects in chromatographic fillers.

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