Polyelectrolyte stabilized nanodiamond dispersions

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Tiainen , T , Myllymäki , T T T , Hatanpää , T , Tenhu , H & Hietala , S 2019 , ' Polyelectrolyte stabilized nanodiamond dispersions ' , Diamond and Related Materials , vol. 95 , pp. 185-194 . https://doi.org/10.1016/j.diamond.2019.04.019

Title: Polyelectrolyte stabilized nanodiamond dispersions
Author: Tiainen, Tony; Myllymäki, Teemu T. T.; Hatanpää, Timo; Tenhu, Heikki; Hietala, Sami
Contributor: University of Helsinki, Polymers
University of Helsinki, Department of Chemistry
University of Helsinki, Department of Chemistry
University of Helsinki, Department of Chemistry
Date: 2019-05
Language: eng
Number of pages: 10
Belongs to series: Diamond and Related Materials
ISSN: 0925-9635
URI: http://hdl.handle.net/10138/302815
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-bPDMAEMA-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.
Subject: CARBON
CHEMISTRY
Colloidal stability
DEAGGREGATION
DIRECT FUNCTIONALIZATION
END-GROUP
FLUORESCENT NANODIAMONDS
GRAPHENE
Nanodiamond
PDMAEMA
POLYMERS
POWDERS
Polyelectrolyte complex
Zeta potential
116 Chemical sciences
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