Gao Weihong, Rigout Muriel, Owens Huw
School of Materials, The University of Manchester, Manchester, M13 9PL UK.
School of Design, University of Leeds, Leeds, LS2 9JT UK.
J Nanopart Res. 2016;18(12):387. doi: 10.1007/s11051-016-3691-8. Epub 2016 Dec 17.
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. Figureᅟ .
在这项工作中，采用施托伯法制备了介观尺度范围内的均匀二氧化硅纳米颗粒（SNP）。这项工作的新颖之处在于，在固定其他反应条件的同时，仅通过改变所用溶剂乙醇的体积来控制所制备的二氧化硅颗粒大小。使用这种基于施托伯法的一步溶剂变化（SV）方法，重复制备了七批目标直径范围为70至400nm的SNP，并且多分散指数（PDI）方面的尺寸分布得到了很好的保持（在0.1以内）。使用指数方程来拟合颗粒直径与乙醇体积之间的关系。该方程能够预测在该尺寸范围内制备任何目标直径颗粒所需的乙醇量。此外，发现所有批次的反应无论乙醇体积如何，均在约2小时内完成。通过在重力沉降下自组装，由制备的SNP制造了具有结构色的人工蛋白石光子晶体（PC）。图ᅟ。
