Hydrophobic Surface Coating of Nanodiamonds by Polyglycerol-Based Polymers with Alkyl Chains for Dispersing in an Organic Solvent

Wei Wang, Yajuan Zou, Alejandro López-Moreno, Yujing Jiang, Feng Wen, Hong Xing Wang, Naoki Komatsu

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Since nanodiamonds (NDs) have been attracting growing interest in the field of nanomedicine, aqueously dispersed NDs have been numerously prepared by surface functionalization with hydrophilic groups. In contrast, hydrophobic NDs dispersible in organic solvents have been elusive in spite of the various potential applications such as tribology, lubrication and abrasion. Herein, NDs with a diameter of 100 nm (ND100) are made to be dispersible in an organic solvent through the following two processes: 1) ring opening polymerization of 1,2-epoxyhexane giving NDs functionalized with poly(1,2-hexylene glycol) (ND-PHG) and 2) ring opening polymerization of glycidol followed by Williamson ether synthesis giving NDs functionalized with octyl and tetradecyl groups (ND-POPG and ND-PTPG, respectively). These functionalized NDs are characterized qualitatively by Fourier transform infrared spectroscopy (FTIR) and quantitatively by thermogravimetric analysis (TGA). All these NDs with hydrophobic polymers are dispersible in chloroform, while no dispersibility is observed in NDs without surface polymer coating. ND-POPG and ND-PTPG are found to show much higher dispersibility (∼5 mg/mL in chloroform) than ND-PHG (∼0.3 mg/mL). The dispersibility or hydrophobicity is correlated with the number of the alkyl chains, determined by TGA, as well as their length.

Original languageEnglish
Pages (from-to)1332-1336
Number of pages5
JournalChemNanoMat
Volume6
Issue number9
DOIs
Publication statusPublished - Sep 1 2020
Externally publishedYes

Keywords

  • dispersibility
  • hydrophobic
  • nanodiamond
  • polyglycerol
  • surface functionalization

ASJC Scopus subject areas

  • Biomaterials
  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Materials Chemistry

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