Polyelectrolyte stabilized nanodiamond dispersions

Research output: Contribution to journalArticleScientificpeer-review

Researchers

  • Tony Tiainen
  • Teemu T.T. Myllymäki
  • Timo Hatanpää
  • Heikki Tenhu
  • Sami Hietala

Research units

  • University of Helsinki

Abstract

Colloidal stability of negatively charged nanodiamonds (ND) has been realized with the help of double hydrophilic block copolymers poly(ethylene oxide)-block-poly(dimethylaminoethyl methacrylate)-dodecyl (PEO-b-PDMAEMA-C12). The polymers were synthesized through RAFT polymerization of DMAEMA with a PEO macromonomer carrying trithiocarbonate and dodecyl end-groups. The NDs and the polymers were complexed by mixing them in different ratios. In addition to the amount of polymers, the effect of the detailed structure of the polymer was of interest and thus, also polymers with different lengths of the PEO-block were synthesized, as well as a block copolymer without the dodecyl end-group. The composition of the polymer, as well as the complexation conditions were varied to find the route to stable nanoparticles. The optimized complexation method gave colloidally stable ND particles with positively charged PDMAEMA coronas. The colloids were stable at room temperature and also in saline solutions up to 0.154 M NaCl.

Details

Original languageEnglish
Pages (from-to)185-194
Number of pages10
JournalDiamond and Related Materials
Volume95
Publication statusPublished - 1 May 2019
MoE publication typeA1 Journal article-refereed

    Research areas

  • Colloidal stability, Nanodiamond, Polyelectrolyte complex, Zeta potential

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