RESUMEN
The idea of using diamond and diamond containing materials in separation sciences has attracted a strong interest in the past decade. The combination of a unique range of properties, such as chemical inertness, mechanical, thermal and hydrolytic stability, excellent thermal conductivity with minimal thermal expansion and intriguing adsorption properties makes diamond a promising material for use in various modes of chromatography. This review summarises the recent research on the preparation of diamond and diamond based stationary phases, their properties and chromatographic performance. Special attention is devoted to the dominant retention mechanisms evident for particular diamond containing phases, and their subsequent applicability to various modes of chromatography, including chromatography carried out under conditions of high temperature and pressure.
Asunto(s)
Cromatografía/instrumentación , Diamante/química , Adsorción , Cromatografía/métodosRESUMEN
The chromatographic properties of microdispersed sintered nanodiamonds (MSND) are studied under conditions of normal-phase HPLC. The retention characteristics of 30 substances representing four classes of aromatic compounds including monoalkylbenzenes, polymethylbenzenes, di-n-alkyl phthalates and polyaromatic hydrocarbons in n-alkane mobile phases have been measured. The selectivity of MSND was compared with literature data for other common adsorbents including silica gel, alumina and porous graphitic carbon (PGC). MSND shows the distinctive adsorption properties especially in a stronger retention of aromatic hydrocarbons and in the better selectivity of the separation of geometric isomers. The significant improvement in separation efficiency up to 45,300 theoretical plates per meter, was achieved for the first time for the columns packed with diamond related materials (DRM).
Asunto(s)
Cromatografía Líquida de Alta Presión/instrumentación , Diamante/química , Nanoestructuras/química , Adsorción , Alquilación , Benceno/aislamiento & purificación , Cromatografía Líquida de Alta Presión/métodos , Nanoestructuras/ultraestructura , Ácidos Ftálicos/aislamiento & purificación , Hidrocarburos Policíclicos Aromáticos/aislamiento & purificación , PorosidadRESUMEN
The microdispersed sintered nanodiamonds are evaluated as a new prospective stationary phase for normal-phase high-performance liquid chromatography.
RESUMEN
The possibility of using sintered diamonds as a stationary phase in ion chromatography has been evaluated. Bare sintered synthetic nanodiamonds demonstrated the properties of a weak cation-exchanger. The observed ion-exchange selectivity is similar to carboxylic type cation-exchangers. The regularities of retention of alkali, alkaline-earth and transition metal ions on a column packed with sintered nanodiamonds in dilute nitric acid were studied and the occurrence of chelating properties was noted. For the first time chromatographic separations of model mixtures of cations on diamonds have been obtained.