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Du, Xin; He, Junhui
Chemistry : a European journal, July 11, 2011, Volume: 17, Issue: 29Journal Article
A series of hierarchically mesostructured silica nanoparticles (MSNs) less than 100 nm in size were fabricated by means of a one‐step synthesis using dodecanethiol (C12SH) and cetyltrimethylammonium bromide (CTAB) as the dual template, and trimethylbenzene (TMB) as the swelling agent. Silica nanoparticles with varied morphologies and structures, including mesoporous silica nanoparticles with tunable pore size, mesoporous silica nanoparticles with a thin solid shell, hollow mesoporous silica nanoparticles with tunable cavity size, and hollow mesoporous silica nanoparticles with a thin solid shell, were obtained by regulating the TMB/CTAB molar ratio and the stirring rate with the assistance of C12SH. Silica particulate coatings were successfully fabricated by using MSNs with varied morphologies and structures as building block through layer‐by‐layer dip‐coating on glass substrates. The thickness and roughness of the silica particulate coatings could be tailored by regulating the deposition cycles of nanoparticles. The silica particulate coatings composed of hollow mesoporous silica nanoparticles with a thin shell (S2) increased the maximum transmittance of slide glass from 90 to 96 %, whereas they reduced its minimum reflection from 8 to 2 % at the optimized wavelength region that could be adjusted from visible to near‐IR with a growing number of deposition cycles. The coatings also exhibited excellent superhydrophilic and antifogging properties. These mesostructured silica nanoparticles are also expected to serve as ideal scaffolds for biological, medical, and catalytic applications. Tailor‐made nanospheres: A series of hierarchically mesostructured silica nanoparticles of less than 100 nm in size (see graphic) were facilely fabricated by means of a one‐step synthesis using dodecanethiol and cetyltrimethylammonium bromide as a dual template, and trimethylbenzene as the swelling agent.
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