Monodisperse hollow silica spheres: An in-depth scattering analysis
- 273 Downloads
Herein, we fabricate hollow silica nanoparticles with exceptionally narrow size distributions that inherently possess two distinct length scales—tens of nanometers with regards to the shell thickness, and hundreds of nanometers in regards to the total diameter. We characterize these structures using dynamic and static light scattering (DLS and SLS), small angle X-ray scattering (SAXS), and transmission electron microscopy (TEM), and we demonstrate quantitative agreement among all methods. The ratio between the radius of gyration (SLS) and hydrodynamic radius (DLS) in these particles equals almost unity, corresponding to ideal capsule behavior. We are able to resolve up to 20 diffraction orders of the hollow sphere form factor in SAXS, indicating a narrow size distribution. Data from light and X-ray scattering can be combined to a master curve covering a q-range of four orders of magnitude assessing all hierarchical length scales of the form factor. The measured SLS intensity profiles noticeably change when the scattering contrast between the interior and exterior is altered, whereas the SAXS intensity profiles do not show any significant change. Tight control of the aforementioned length scales in one simple and robust colloidal building block renders these particles suitable as future calibration standards.
Keywordshollow sphere silica nanoparticle small angle X-ray scattering light scattering nanoscale characterization
Unable to display preview. Download preview PDF.
- Rhee do, K.; Jung, B.; Kim, Y. H.; Yeo, S. J.; Choi, S. J.; Rauf, A.; Han, S.; Yi, G. R.; Lee, D.; Yoo, P. J. Particlenested inverse opal structures as hierarchically structured large-scale membranes with tunable separation properties. ACS Appl. Mater. Interfaces 2014, 6, 9950–9954.CrossRefGoogle Scholar
- Gröschel, A. H.; Walther, A.; Löbling, T. I.; Schacher, F. H.; Schmalz, H.; Müller, A. H. E. Guided hierarchical coassembly of soft patchy nanoparticles. Nature 2013, 503, 247–251.Google Scholar
- Cosgrove, T. Colloid Science: Principles, Methods and Applications, 2nd ed.; Wiley-Blackwell: Oxford, 2010.Google Scholar
- Blanton, T. N.; Huang, T. C.; Toraya, H.; Hubbard, C. R.; Robie, S. B.; Louër, D.; Göbel, H. E.; Will, G.; Gilles, R.; Raftery, T. JCPDS—International Centre for Diffraction Data round robin study of silver behenate. A possible low-angle X-ray diffraction calibration standard. Powder Diffr. 1995, 10, 91–95.CrossRefGoogle Scholar
- Nyam-Osor, M.; Soloviov, D. V.; Yu, S. K.; Zhigunov, A.; Rogachev, A. V.; Ivankov, O. I.; Erhan, R. V.; Kuklin, A. I. Silver behenate and silver stearate powders for calibration of SAS instruments. J. Phys.: Conf. Ser. 2012, 351, 012024.Google Scholar
- Kohlbrecher, J. SASfit: A Program for Fitting Simple Structural Models to Small Angle Scattering Data. Paul Scherrer Institute, Laboratory for Neutron Scattering: Villigen, Switzerland, 2014.Google Scholar