Colloid-Imprinted Carbons as Stationary Phases for Reversed-Phase Liquid Chromatography

Abstract

A novel colloid-imprinting method is employed for the preparation of carbonaceous stationary phases for reversed-phase liquid chromatography (RPLC). This colloid-imprinting method combined with oxidative stabilization treatment affords carbons with a porous shell/nonporous core structure. The particle morphology, pore size, pore shape, and Brunauer-Emmett-Teller surface area of these carbons can be finely tuned by selecting proper experimental conditions. Although their surface area and pore volume decrease noticeably after graphitization, their primary pore structure is maintained. In addition, the graphitization process eliminates the high-energy sites and substantially reduces structural heterogeneity, making colloid-imprinted carbons attractive stationary phases for reversed-phase liquid chromatography. The colloid-imprinted graphitic carbons with surface mesoporosity appeared to be attractive for chromatographic separations of alkylbenzenes under reversed-phase conditions.

Recent Progress in the Synthesis of Porous Carbon Materials

“…[36] The resulting graphitic mesoporous carbons were successfully used as the stationary phase for reverse-phase liquid chromatography in the separation of alkylbenzenes, such as benzene, ethylbenzene, and propylbenzene. [37] Jang and co-workers synthesized carbon nanocapsules and mesocellular carbon foams by surface-modified colloidal silica-templating methods. [38] Carbon nanocapsules were synthesized using polydivinylbenzene (DVB) as a carbon precursor, poly(methyl methacrylate) (PMMA) as a barrier for the prevention of intraparticle crosslinking of DVB, and surfactantcoated colloidal silica particles as a template.…”

Wettability of colloid-imprinted carbons by contact angle kinetics and water vapor sorption measurements

“…Nanoporous carbon materials have attracted extensive interest in recent decades because of their low cost, tunable pore sizes, high specific surface areas, modifiable surface properties, and good electrical conductivity [1][2][3][4][5][6][7][8][9][10][11]. These porous carbon materials are promising candidates as adsorbents, catalyst supports, electrodes in capacitors, etc.…”

Replication and Coating of Silica Templates by Hydrothermal Carbonization

“…The templated nanoporous carbon materials obtained via these methods contain uniform pores and large surface areas; however, these materials possess a highly hydrophobic and aromatic surface character because of the high temperatures that are required for the carbonization step. [16,17] To reconstitute parts of the original functionality, or to add acidic as well as basic surface functional groups to microporous carbon, a subsequent chemical or steam activation of the carbon surface has to be applied. [18] The conventional modification of the carbon surface involves oxidation with acids or ozone, thereby generating functionalities such as carboxylic acids, esters, or quinines.…”