Self-association and gel formation during sedimentation of like-charged colloids

Xu, Xufeng; de With, Gijsbertus; Cölfen, Helmut

Self-association and gel formation during sedimentation of like-charged colloids

Dateien

Xu_2-147mi59xe94ly1.pdfGröße: 253.45 KBDownloads: 8

Datum

2022

Autor:innen

Xu, Xufeng

de With, Gijsbertus

Cölfen, Helmut

Open Access-Veröffentlichung

Open Access Green

Sammlungen

Chemie

Publikationstyp

Zeitschriftenartikel

Publikationsstatus

Published

Erschienen 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/D1MH01854J

Zusammenfassung

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.

Fachgebiet (DDC)

540 Chemie

Zitieren

ISO 690

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/D1MH01854J

BibTex

@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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