Publikation: Self-association and gel formation during sedimentation of like-charged colloids
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Formation of superstructures from colloidal dispersion involves a continuous increase in particle concentration, resulting in increasingly more complicated interparticle interaction. At high particle concentration, the presence of the super-crowding effect, strong non-ideality in addition to significant light absorption and scattering makes particle analysis very difficult. Here we report quantitative molecular, microscopic and macroscopic experimental results on like-charged colloids with concentration up to 60 vol%, close to the densest possible packing of spheres. It is achieved by conducting sedimentation–diffusion-equilibrium analytical ultracentrifugation (SE-AUC) on a concentrated dispersion of colloidal silica nanoparticles in a refractive-index-matching solvent. Surprisingly, we observed the self-association and even colloidal gel formation of like-charged colloids at very high concentration. Further experiments indicate that the attraction force may be counter-ion mediated. These results represent an important step forward in understanding complicated interparticle interaction in extremely high concentration, which is vital for the controlled fabrication of colloidal superstructures.
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XU, Xufeng, Gijsbertus DE WITH, Helmut CÖLFEN, 2022. Self-association and gel formation during sedimentation of like-charged colloids. In: Materials Horizons. Royal Society of Chemistry (RSC). 2022, 9(4), pp. 1216-1221. ISSN 2051-6347. eISSN 2051-6355. Available under: doi: 10.1039/D1MH01854JBibTex
@article{Xu2022Selfa-56578, year={2022}, doi={10.1039/D1MH01854J}, title={Self-association and gel formation during sedimentation of like-charged colloids}, number={4}, volume={9}, issn={2051-6347}, journal={Materials Horizons}, pages={1216--1221}, author={Xu, Xufeng and de With, Gijsbertus and Cölfen, Helmut} }
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