TY - JOUR
T1 - Characterizing size and porosity of hollow nanoparticles
T2 - SAXS, SANS, TEM, DLS, and adsorption isotherms compared
AU - Chen, Zhi Hong
AU - Kim, Chanhoi
AU - Zeng, Xiang Bing
AU - Hwang, Sun Hye
AU - Jang, Jyongsik
AU - Ungar, Goran
PY - 2012/10/30
Y1 - 2012/10/30
N2 - A combination of experimental methods, including transmission and grazing incidence small-angle X-ray scattering (SAXS and GISAXS), small-angle neutron scattering (SANS), transmission electron microscopy (TEM), dynamic light scattering (DLS), and N 2 adsorption-desorption isotherms, was used to characterize SiO 2/TiO 2 hollow nanoparticles (HNPs) of sizes between 25 and 100 nm. In the analysis of SAXS, SANS, and GISAXS data, the decoupling approximation and the Percus-Yevick structure factor approximation were used. Brunauer-Emmett-Teller, t-plot, and a spherical pore model based on Kelvin equation were applied in the treatment of N 2 isotherms. Extracted parameters from the scattering and TEM methods are the average outer and inner diameters and polydispersity. Good agreement was achieved between different methods for these extracted parameters. Merits, advantages, and disadvantages of the different methods are discussed. Furthermore, the combination of these methods provided us with information on the porosity of the shells of HNPs and the size of intrawall pores, which are critical to the applications of HNPs as drug delivery vehicles and catalyst supports.
AB - A combination of experimental methods, including transmission and grazing incidence small-angle X-ray scattering (SAXS and GISAXS), small-angle neutron scattering (SANS), transmission electron microscopy (TEM), dynamic light scattering (DLS), and N 2 adsorption-desorption isotherms, was used to characterize SiO 2/TiO 2 hollow nanoparticles (HNPs) of sizes between 25 and 100 nm. In the analysis of SAXS, SANS, and GISAXS data, the decoupling approximation and the Percus-Yevick structure factor approximation were used. Brunauer-Emmett-Teller, t-plot, and a spherical pore model based on Kelvin equation were applied in the treatment of N 2 isotherms. Extracted parameters from the scattering and TEM methods are the average outer and inner diameters and polydispersity. Good agreement was achieved between different methods for these extracted parameters. Merits, advantages, and disadvantages of the different methods are discussed. Furthermore, the combination of these methods provided us with information on the porosity of the shells of HNPs and the size of intrawall pores, which are critical to the applications of HNPs as drug delivery vehicles and catalyst supports.
UR - https://www.scopus.com/pages/publications/84868159248
U2 - 10.1021/la302236u
DO - 10.1021/la302236u
M3 - 文章
AN - SCOPUS:84868159248
SN - 0743-7463
VL - 28
SP - 15350
EP - 15361
JO - Langmuir
JF - Langmuir
IS - 43
ER -