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.

中文翻译：

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纳米烷基的疏水性表面涂层，由具有烷基链的聚甘油基聚合物分散在有机溶剂中

由于纳米金刚石（NDs）在纳米医学领域引起了越来越多的兴趣，因此已经通过具有亲水性基团的表面官能化大量制备了水分散的NDs。相反，尽管存在摩擦学，润滑和磨蚀等各种潜在应用，但可分散在有机溶剂中的疏水性ND却难以捉摸。在此，直径为100 nm的ND（ND ₁₀₀）通过以下两个过程使其可分散在有机溶剂中：1）1,2-环氧己烷的开环聚合，得到被聚（1,2-己二醇）（ND-PHG）官能化的NDs; 2）开环缩水甘油的聚合反应，随后通过Williamson醚合成得到具有辛基和十四烷基官能团的ND（分别为ND-POPG和ND-PTPG）。这些功能化的NDs通过傅立叶变换红外光谱（FTIR）进行定性表征，并通过热重分析（TGA）进行定量表征。所有这些具有疏水性聚合物的NDs都可分散在氯仿中，而没有表面聚合物涂层的NDs则没有分散性。发现ND-POPG和ND-PTPG的分散性（在氯仿中约为5 mg / mL）比ND-PHG（约0.3 mg / mL）更高。