Fabrication of Carbon-Like, π-Conjugated Organic Layer on a Nano-Porous Silica Surface

Abstract

This paper presents a new type of black organic material-porous silica composite providing an extremely highly selective adsorption surface. This black composite was prepared by lamination on nano-sized pores with a carbon-like, π-extended structure, which can be converted via the on-site polymerization of 1,5-dihydroxynaphthalene with a triazinane derivative and a thermally induced condensation reaction with denitrification. This bottom-up fabrication method on porous materials had the great advantage of maintaining the pore characteristics of a raw porous material, but also the resultant black surface exhibited an extremely high molecular-shape selectivity; for example, that for trans- and cis-stilbenes reached 14.0 with the black layer-laminated porous silica, whereas it was below 1.2 with simple hydrophobized silica.

A Molecular Shape Recognitive HPLC Stationary Phase Based on a Highly Ordered Amphiphilic Glutamide Molecular Gel

“…The development of HPLC stationary phases is of importance to expand its applicability in various fields. So far, various surface-modified porous silica particles having organic phases such as ionic liquid analogues [1][2][3][4][5], synthetic polymers [6,7], oligo-peptides [8][9][10], and carbon materials [11][12][13] have been developed for practical use as HPLC stationary phases. These organic phases show high selectivity toward for samples that are difficult to separate with conventional octadecylated-porous silica (ODS) in reversed-phase HPLC because of their unique interaction sites.…”

Sequential chiral induction between organic and inorganic supramolecular helical assemblies for the in situ formation of chiral carbon dots

“…4). 35,36 In addition to being compatible with the HNHs, this polymer was previously shown to be a promising precursor for nitrogen-rich carbon material. Following ion exchange from tartrate to DHN, the HNHs were pinkish and showed an absorption maximum at 228 nm (Fig.…”