title: A simple approach to prepare monodisperse mesoporous silica nanospheres with adjustable sizes.
abstract: A new and facile approach has been developed to prepare monodisperse mesoporous silica nanospheres (MMSNs) with controlled particle sizes and pore structures. In our approach, MMSNs were synthesized simply in a sodium acetate solution without adding any other alkali or alcohol additives. MMSNs have a spherical shape and uniform particle sizes, which can be adjusted from 50 to 110 nm by increasing the reaction temperature from 40 to 80 °C. By performing a subsequent hydrothermal treatment (HT) under basic condition (pH=~11.5) at 130 °C, the mesoporous pore volume and surface area can be enhanced, while keeping the mono-dispersion characteristics and the mesopore size almost unchanged. The pore sizes of MMSNs can be adjusted from 2.8 to 4.0 nm under acidic solutions by changing the HT temperature from 100 to 130 °C. The formation process of MMSNs has been investigated by transmission electron microscopy (TEM) and attenuated total reflection Fourier transform infrared (ATR-FTIR) techniques. A spherical micelle templating mechanism is proposed to explain the formation of MMSNs in our system, which is different from that of traditional highly ordered mesoporous silica nanoparticles (MCM-41).
authors.affiliation: ARC Centre of Excellence for Functional Nanomaterials and Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, QLD 4072, Australia.
authors.forename: Meihua
authors.initials: M
authors.lastname: Yu
authors.forename: Liang
authors.initials: L
authors.lastname: Zhou
authors.forename: Jun
authors.initials: J
authors.lastname: Zhang
authors.forename: Pei
authors.initials: P
authors.lastname: Yuan
authors.forename: Peter
authors.initials: P
authors.lastname: Thorn
authors.forename: Wenyi
authors.initials: W
authors.lastname: Gu
authors.forename: Chengzhong
authors.initials: C
authors.lastname: Yu
mesh_terms: D054118:Nanospheres / Q000737:chemistry* / Q000648:ultrastructure; D036103:Nanotechnology / Q000191:economics / Q000379:methods*; D010316:Particle Size; D016062:Porosity; D012822:Silicon Dioxide / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature
chemical_list: D012822:Silicon Dioxide