Multiangle Depolarized Dynamic Light Scattering of Short Functionalized Single-Walled Carbon Nanotubes

Flow Dichroism as a Reliable Method to Measure the Hydrodynamic Aspect Ratio of Gold Nanoparticles

“…(3) using their data, we see that values of P DDLS are almost 50% smaller than those estimated from P T EM estimated by adding CTAB layer thickness 22 . Similarly, hydrodynamic aspect ratios for single walled carbon nanotubes calculated from DDLS measurements gave almost an order of magnitude differences when compared with AFM results 25 . The main reason behind the large errors in obtaining the hydrodynamic aspect ratio using DDLS seems to be the high sensitivity of diffusion coefficients to aspect ratio.…”

In-Situ Structural Characterization of Single-Walled Carbon Nanotubes in Dispersion

“…In the former (latter) experiments, the incident beam is in a vertical polarization direction and the vertically (horizontally) polarized scattered light is detected. Depending upon whether a polarized or depolarized DLS experiment is performed, for a dilute dispersion of rodlike particles, g 1 (), is related to the distribution of the diffusion coefficients of the particles by (Chu, 1991;Berne & Pecora, 2000;Lehner et al, 2000;Shetty et al, 2009) :…”

“…(4b) and (4c) to obtain the length and diameter of the rods. With this approach, Shetty et al (Shetty et al, 2009) and Badaire et al (Badaire et al, 2004) respectively investigated using the polarized DLS technique for in-situ determination of the average length and diameter of functionalized SWCNTs as well as SDS-stabilized SWCNTs in aqueous dispersions. Similar to SLS technique, the strong optical absorption of SWCNTs could also cause the experimental difficulties in using the DLS technique for the structural characterization of SWCNT dispersions.…”

Nonspherical nanoparticles characterization by partially depolarized dynamic light scattering

“…Physico-chemical methods, primarily optical, require relatively inexpensive equipment, substantially less time for the sample preparation and analysis, allows to automate the analysis procedure. Such optical method, as depolarized dynamic light scattering (DDRS), was used in a number of studies for control of the geometric parameters of non-spherical NP [1][2][3][4][5][6]. The method is based on the detection of intensity fluctuations of the scattered light by the particles moving under the influence of Brownian motion in a liquid.…”

“…DRS method was used for measuring geometrical parameters of gold nanoparticles [1,3,4] and carbon nanotubes [2,5]. The main limitation of DDRS is the need of measurement of very weak optical signals for registration depolarized component of scattered light (components VH).…”