Anthracene silica gel, a new polycyclic-aromatic-bonded stationary phase for HPLC

Highly dispersed platinum nanoparticles supported on silica as catalyst for hydrogen production

“…The immobilization of functional groups, metal complexes and nanoparticles on the silica surface has attracted great interest due to their uses in many applications, such as chromatography, 1,2 extraction of cations from aqueous and non-aqueous solvents [3][4][5] catalytic or ion-exchange reactions [6][7][8] and chemical sensors. 9,10 The amine functional groups immobilized on silica gel surfaces are widely used for adsorbing metal ions from aqueous and non-aqueous solutions and capturing CO 2 while thiol functional groups are used mainly to adsorb heavy metal ions.…”

“…25,26 The incorporation of metal nanoparticles into support matrix such as silica is carried out by variety of methods, such as wet impregnation, ion exchange and chemical surface modication. [2][3][4][27][28][29][30][31][32][33] In the surface modication method, the metal precursors (ions) are attached to the support surface through pre-attached functional groups followed by chemical reduction to form metal nanoparticles incorporation composite. 34,38 Platinum nanoparticles having diameters ranging from 3 to 10 nm have been widely used as a catalyst in particular for fuel cells, due to their large surface area and excellent enhanced catalytic properties.…”

Homogenous formation and quaternization of urea-functionalized imidazolyl silane and its immobilization on silica for surface-confined ionic liquid stationary phases

“…This charge-transfer phenomenon has been noted for stationary phases functionalized by uorene, anthracene and pyrene. [28][29][30][31] The log k for HB and MB monotonically increased with the CA value. Nevertheless, the effect of the polarity of hydroxyl group on the retention was signicant on Sil-UIm, where retention of HB was the strongest, indicating the acidbase equilibrium and dipole-dipole interaction between solute and imidazole ring.…”

Retention behavior of large polycyclic aromatic hydrocarbons on metalloprotoporphyrin-silica stationary phases

“…Much research has focused on the separation of LPAHs on chemically bonded reversed-phases. Such phases are already used widely for the separation of small PAHs [7][8][9][10][11][12][13][14]. While researchers have demonstrated some success in using octadodecylsilyl(ODS)-silica phases in LPAH separations, usually sophisticated solvent programs and high temperatures are needed [15] because the difference in capacity factors of LPAHs on ODS phases is too large to use a single-solvent system or even a two-solvent system.…”