Surface-Functionalized Periodic Mesoporous Organosilica Hollow Spheres

Abstract

Surface-functionalized periodic mesoporous organosilica (PMO) hollow spheres are successfully synthesized by using a hybrid silica precursor, 1,2-bis(trimethoxysilyl)ethane (BTME), and five precursors with different functional groups (-SH, -NH 2 , -CN, -CdC, -benzene) as well as surfactants, fluorocarbon and cetyltrimethylammonium bromide, combining a new vesicle and liquid crystal "dual templating" technique. Different disruption effects on the final mesostructure are observed following the order of -SH from 3-mercaptopropyltrimethoxysilane (MPTMS) > -benzene from (trimethoxysilyl)benzene (TMSB) ∼ -CdC from vinyltrimethoxysilane (VTMS) > -NH 2 from 3-aminopropyltriethoxysilane (APTES) > -CN from 3-cyanopropyltriethoxysilane (CPTES). The particle size, cavity size, and wall thickness of these hollow spheres can be adjusted by changing the amount of precursors or surfactants applied. In terms of providing better control over surface properties of products and giving more uniform surface coverage of functional groups, this direct synthesis method may benefit future production of hollow particles by a combination of various bridged organic and terminal functional groups for more versatile applications in catalyst, separation, drug/gene delivery, microelectronics field, etc.

Microwave energy-based synthesis and characterisation of hollow carbon nanospheres decorated with carbon nanotubes or metal oxide nanowires

“…To date, several methods have been proposed to prepare various HCS composites decorated with different nanomaterials and morphologies, [10][11][12] including the template-assisted methods, [13,14] precursor-controlled carbonisation, [15] solvo/thermal methods, [16] self-assembly by using soft templates, [17] pyrolysis, [18] and chemical vapour deposition with a relevant catalyst. [19] For this purpose, polymeric materials, i.e., conducting polymers (CPs), have been commonly used as carbon precursors.…”

Tunable Assembly of Organosilica Hollow Nanospheres

“…The fabrication of organosilicas in nanospherical morphology has attracted much research attention because of their potential applications in catalysis, drug delivery, and protection materials for biomolecules. [5][6][7][8][9][10][11] Due to the difficulty in the synthesis of hollow nanospheres, there are only limited reports for the synthesis of OHNs. [5][6][7][8][9][10][11] The first OHNs (particle size in the range 300-800 nm) with ethylene-bridging group and highly ordered mesoporous structure in the shell were reported by Lu's group through a vesicle and a liquid crystal "dual templating" approach.…”

“…[5][6][7][8][9][10][11] Due to the difficulty in the synthesis of hollow nanospheres, there are only limited reports for the synthesis of OHNs. [5][6][7][8][9][10][11] The first OHNs (particle size in the range 300-800 nm) with ethylene-bridging group and highly ordered mesoporous structure in the shell were reported by Lu's group through a vesicle and a liquid crystal "dual templating" approach. 5 Recently, the ethane-silica hollow nanospheres were facilely synthesized through condensation of 1,2-bis(trimethoxysilyl)ethane (BTME) around an inorganic-electrolyte-stabilized F127 micelle under mild buffer conditions (NaH 2 PO 4 -Na 2 HPO 4 , pH ≈ 7.0).…”

Chemistry of Mesoporous Organosilica in Nanotechnology: Molecularly Organic–Inorganic Hybridization into Frameworks

“…[ 123,124 ] Via a vesicle-templating process by the selfassembly between FC4 and BTME, vesicles could form; this was then followed by a liquid-crystal-templating procedure by CTAB and hydrolyzed/condensed BTME. Uniform spherical MONs with large hollow interiors ( R = ethane) were obtained by this dual softtemplating approach ( Figure 5 a).…”

“…[ 124,[143][144][145][146] For instance, HMONs with multi-shells were recently synthesized by a facile and controllable "multiinterface transformation" methodology. [ 147 ] Organosilica shells were successively grown onto the surface of as-synthesized solid organosilica/CTAB composite particles ( Figure 7 ).…”