Experimental Method to Distinguish between a Solution and a Suspension

Abstract

The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/admi.202200600.

Versatile Capillary Cells for Handling Concentrated Samples in Analytical Ultracentrifugation

“…The curves were used to calculate the EOS plot for each particle by using the method developed before. 17,23 Additionally, taking BSA as an example, we show in Figure S3 that the EOS of BSA obtained from a typical 3 mm centerpiece is similar to that obtained from the current capillary design. By calculating the first derivative of the osmotic pressure in the EOS curves (…”

“…The concentration gradient curves from the SE scans of these samples are shown in Figure . The curves were used to calculate the EOS plot for each particle by using the method developed before. , Additionally, taking BSA as an example, we show in Figure S3 that the EOS of BSA obtained from a typical 3 mm centerpiece is similar to that obtained from the current capillary design. By calculating the first derivative of the osmotic pressure in the EOS curves ( normald π normald ρ = B 22 ρ ), the second virial coefficients can be thus determined for the measured particle concentration range.…”

“…For example, Page et al used AUC-SE with a double-sector gasket to obtain the equation of state for synthetic clay colloids and to study their phase transition boundaries . Our group also used this technique to study the properties of nanoparticle dispersions such as gold nanoparticles of different sizes and surface coatings . However, we and others have found it problematic to load samples into this kind of cell. , Current setups are difficult and unreliable to handle, leading to a low experimental success rate for a number of reasons which will be elaborated below.…”

Colloidal Stability of TiO2 Nanoparticles: The Roles of Phosphonate Ligand Length and Solution Temperature

“…It should be noted here that we may be looking at solubility as well as colloidal stability, but we leave the distinction between these concepts to other studies. [39] The approach described here is applicable to a wide range of surface chemistries of colloidal NP-ligand complexes in terms of dispersibility. The utility of this approach is demonstrated to investigate the solution properties of n-alkylphosphonate-capped TiO 2 colloidal NPs.…”

“…Although the term “nanoparticle stability” has a variety of meanings, [38] this paper focuses on colloidal stability with respect to reversible dispersion and agglomeration in the solution phase, as quantified by dynamic light scattering (DLS) analysis. It should be noted here that we may be looking at solubility as well as colloidal stability, but we leave the distinction between these concepts to other studies [39] . The approach described here is applicable to a wide range of surface chemistries of colloidal NP‐ligand complexes in terms of dispersibility.…”