TY - JOUR
T1 - Extending depolarized DLS measurements to turbid samples
AU - Pal, Antara
AU - Holmqvist, Peter
AU - Vaccaro, Andrea
AU - Schurtenberger, Peter
PY - 2022/12
Y1 - 2022/12
N2 - The application of dynamic light scattering to soft matter systems has strongly profited from advanced approaches such as the so-called modulated 3D cross correlation technique (Mod3D-DLS) that suppress contributions from multiple scattering, and can therefore be used for the characterization of turbid samples. Here we now extend the possibilities of this technique to allow for depolarized light scattering (Mod3D-DDLS) and thus obtain information on both translational and rotational diffusion, which is important for the characterization of anisotropic particles. We describe the required optical design and test the performance of the approach for increasingly turbid samples using well defined anisotropic colloidal models systems. Our measurements demonstrate that 3D-DDLS experiments can be performed successfully for samples with a reduced transmission due to multiple scattering as low as 1%. We compare the results from this approach with those obtained by standard DDLS experiments, and point out the importance of using an appropriate optical design when performing depolarized dynamic light scattering experiments with turbid systems.
AB - The application of dynamic light scattering to soft matter systems has strongly profited from advanced approaches such as the so-called modulated 3D cross correlation technique (Mod3D-DLS) that suppress contributions from multiple scattering, and can therefore be used for the characterization of turbid samples. Here we now extend the possibilities of this technique to allow for depolarized light scattering (Mod3D-DDLS) and thus obtain information on both translational and rotational diffusion, which is important for the characterization of anisotropic particles. We describe the required optical design and test the performance of the approach for increasingly turbid samples using well defined anisotropic colloidal models systems. Our measurements demonstrate that 3D-DDLS experiments can be performed successfully for samples with a reduced transmission due to multiple scattering as low as 1%. We compare the results from this approach with those obtained by standard DDLS experiments, and point out the importance of using an appropriate optical design when performing depolarized dynamic light scattering experiments with turbid systems.
KW - Concentrated colloid suspensions
KW - Depolarized dynamic light scattering
KW - Translational and rotational diffusion
KW - Turbid suspensions
U2 - 10.1016/j.jcis.2022.06.113
DO - 10.1016/j.jcis.2022.06.113
M3 - Article
C2 - 35839555
AN - SCOPUS:85134324196
SN - 0021-9797
VL - 627
SP - 1
EP - 9
JO - Journal of Colloid and Interface Science
JF - Journal of Colloid and Interface Science
ER -