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Synthesis of silica nanoparticles using oil-in-water emulsion and the porosity analysis |
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| Authors: | Linggen Kong Akira Uedono Suzanne V Smith Yukihiro Yamashita Ilkay Chironi |
| Institution: | 1. Institute of Materials Engineering, Australian Nuclear Science and Technology Organization, Locked Bag 2001, Kirrawee, NSW, 2232, Australia 2. Division of Applied Physics, Faculty of Pure and Applied Science, University of Tsukuba, Tsukuba, Ibaraki, 305-8573, Japan 3. Collider–Accelerator Department, Brookhaven National Laboratory, Upton, NY, 11973, USA 4. Centre of Excellence in Antimatter Matter Studies, Australian National University, Canberra, ACT, 0200, Australia |
| Abstract: | A set of silica particles was synthesized in oil–in–water emulsion with particle diameters ranging from ~42?nm to ~115?nm approximately. The porosity of the nanoparticles was analyzed using conventional nitrogen sorption and positron annihilation lifetime spectroscopy (PALS) techniques. The isotherm obtained using nitrogen sorption indicated that the particles were ‘non-porous?? however fitting data with Density Functional Theory model revealed a low concentration pore with diameters from 1.4?nm to 1.7?nm. The pore size was independent of the particle size. In contrast, analysis with PALS revealed a single pore size of ~0.6?nm present in all samples. Difference in results obtained for micropores <4?nm diameter is proposed to be dependent on models used and sample conditions for analysis. |
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