Weitere Artikel dieser Ausgabe durch Wischen aufrufen
The online version of this article (doi:10.1007/s11051-016-3691-8) contains supplementary material, which is available to authorized users.
•The size distribution of silica nanoparticles of a target diameter can be well controlled by only varying the volume of solvent ethanol in the presented modified Stöber process;
•An exponential equation was used to fit the relationship between the particle diameter and ethanol volume;
•Particle diameters ranging from 70 to 400 nm can be easily predicted using the fitted equation and reproduced using the solvent varying method;
•Silica diameters in the range of 207–350 nm produced structurally coloured opal films;
•DLS measurement shows that particle growth completed within 2 h.
In this work, the Stöber process was applied to produce uniform silica nanoparticles (SNPs) in the meso-scale size range. The novel aspect of this work was to control the produced silica particle size by only varying the volume of the solvent ethanol used, whilst fixing the other reaction conditions. Using this one-step Stöber-based solvent varying (SV) method, seven batches of SNPs with target diameters ranging from 70 to 400 nm were repeatedly reproduced, and the size distribution in terms of the polydispersity index (PDI) was well maintained (within 0.1). An exponential equation was used to fit the relationship between the particle diameter and ethanol volume. This equation allows the prediction of the amount of ethanol required in order to produce particles of any target diameter within this size range. In addition, it was found that the reaction was completed in approximately 2 h for all batches regardless of the volume of ethanol. Structurally coloured artificial opal photonic crystals (PCs) were fabricated from the prepared SNPs by self-assembly under gravity sedimentation.
Iler RK (1979) The chemistry of silica: solubility, polymerization, colloid and surface properties and biochemistry. Wiley, Hoboken
Kolbe G (1956) Das komplexchemische verhalten der kieselsäure (Doctoral dissertation). University of Jena, Germany
Nassau K (2001) The physics and chemistry of color: the fifteen causes of color, 2nd Editio. Wiley, Hoboken
Tilley RJD (2010) Colour and the optical properties of materials. Wiley, Chichester CrossRef
Xia Y, Gates B, Yin Y, Lu Y (2000) Monodispersed colloidal spheres: old materials with new spplications. Adv Mater 12:693–713. doi: 10.1002/(SICI)1521-4095(200005)12:10<693::AID-ADMA693>3.3.CO;2-A CrossRef
- Facile control of silica nanoparticles using a novel solvent varying method for the fabrication of artificial opal photonic crystals
- Springer Netherlands
in-adhesives, MKVS, Zühlke/© Zühlke